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1 | #ifndef _LINUX_BLKDEV_H | |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
4 | #ifdef CONFIG_BLOCK | |
5 | ||
6 | #include <linux/sched.h> | |
7 | #include <linux/major.h> | |
8 | #include <linux/genhd.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/backing-dev.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/mempool.h> | |
16 | #include <linux/bio.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/stringify.h> | |
19 | #include <linux/gfp.h> | |
20 | #include <linux/bsg.h> | |
21 | #include <linux/smp.h> | |
22 | ||
23 | #include <asm/scatterlist.h> | |
24 | ||
25 | struct scsi_ioctl_command; | |
26 | ||
27 | struct request_queue; | |
28 | struct elevator_queue; | |
29 | struct request_pm_state; | |
30 | struct blk_trace; | |
31 | struct request; | |
32 | struct sg_io_hdr; | |
33 | ||
34 | #define BLKDEV_MIN_RQ 4 | |
35 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
36 | ||
37 | struct request; | |
38 | typedef void (rq_end_io_fn)(struct request *, int); | |
39 | ||
40 | struct request_list { | |
41 | /* | |
42 | * count[], starved[], and wait[] are indexed by | |
43 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
44 | */ | |
45 | int count[2]; | |
46 | int starved[2]; | |
47 | int elvpriv; | |
48 | mempool_t *rq_pool; | |
49 | wait_queue_head_t wait[2]; | |
50 | }; | |
51 | ||
52 | /* | |
53 | * request command types | |
54 | */ | |
55 | enum rq_cmd_type_bits { | |
56 | REQ_TYPE_FS = 1, /* fs request */ | |
57 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
58 | REQ_TYPE_SENSE, /* sense request */ | |
59 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
60 | REQ_TYPE_PM_RESUME, /* resume request */ | |
61 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
62 | REQ_TYPE_SPECIAL, /* driver defined type */ | |
63 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
64 | /* | |
65 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
66 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
67 | * private REQ_LB opcodes to differentiate what type of request this is | |
68 | */ | |
69 | REQ_TYPE_ATA_TASKFILE, | |
70 | REQ_TYPE_ATA_PC, | |
71 | }; | |
72 | ||
73 | /* | |
74 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
75 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
76 | * SCSI cdb. | |
77 | * | |
78 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
79 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
80 | * | |
81 | */ | |
82 | enum { | |
83 | REQ_LB_OP_EJECT = 0x40, /* eject request */ | |
84 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ | |
85 | }; | |
86 | ||
87 | /* | |
88 | * request type modified bits. first four bits match BIO_RW* bits, important | |
89 | */ | |
90 | enum rq_flag_bits { | |
91 | __REQ_RW, /* not set, read. set, write */ | |
92 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ | |
93 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
94 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
95 | /* above flags must match BIO_RW_* */ | |
96 | __REQ_DISCARD, /* request to discard sectors */ | |
97 | __REQ_SORTED, /* elevator knows about this request */ | |
98 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
99 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
100 | __REQ_FUA, /* forced unit access */ | |
101 | __REQ_NOMERGE, /* don't touch this for merging */ | |
102 | __REQ_STARTED, /* drive already may have started this one */ | |
103 | __REQ_DONTPREP, /* don't call prep for this one */ | |
104 | __REQ_QUEUED, /* uses queueing */ | |
105 | __REQ_ELVPRIV, /* elevator private data attached */ | |
106 | __REQ_FAILED, /* set if the request failed */ | |
107 | __REQ_QUIET, /* don't worry about errors */ | |
108 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
109 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
110 | __REQ_RW_SYNC, /* request is sync (sync write or read) */ | |
111 | __REQ_ALLOCED, /* request came from our alloc pool */ | |
112 | __REQ_RW_META, /* metadata io request */ | |
113 | __REQ_COPY_USER, /* contains copies of user pages */ | |
114 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ | |
115 | __REQ_NOIDLE, /* Don't anticipate more IO after this one */ | |
116 | __REQ_IO_STAT, /* account I/O stat */ | |
117 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ | |
118 | __REQ_NR_BITS, /* stops here */ | |
119 | }; | |
120 | ||
121 | #define REQ_RW (1 << __REQ_RW) | |
122 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) | |
123 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) | |
124 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) | |
125 | #define REQ_DISCARD (1 << __REQ_DISCARD) | |
126 | #define REQ_SORTED (1 << __REQ_SORTED) | |
127 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
128 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
129 | #define REQ_FUA (1 << __REQ_FUA) | |
130 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
131 | #define REQ_STARTED (1 << __REQ_STARTED) | |
132 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
133 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
134 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
135 | #define REQ_FAILED (1 << __REQ_FAILED) | |
136 | #define REQ_QUIET (1 << __REQ_QUIET) | |
137 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
138 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
139 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
140 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) | |
141 | #define REQ_RW_META (1 << __REQ_RW_META) | |
142 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) | |
143 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) | |
144 | #define REQ_NOIDLE (1 << __REQ_NOIDLE) | |
145 | #define REQ_IO_STAT (1 << __REQ_IO_STAT) | |
146 | #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) | |
147 | ||
148 | #define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \ | |
149 | REQ_FAILFAST_DRIVER) | |
150 | ||
151 | #define BLK_MAX_CDB 16 | |
152 | ||
153 | /* | |
154 | * try to put the fields that are referenced together in the same cacheline. | |
155 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
156 | * as well! | |
157 | */ | |
158 | struct request { | |
159 | struct list_head queuelist; | |
160 | struct call_single_data csd; | |
161 | ||
162 | struct request_queue *q; | |
163 | ||
164 | unsigned int cmd_flags; | |
165 | enum rq_cmd_type_bits cmd_type; | |
166 | unsigned long atomic_flags; | |
167 | ||
168 | int cpu; | |
169 | ||
170 | /* the following two fields are internal, NEVER access directly */ | |
171 | unsigned int __data_len; /* total data len */ | |
172 | sector_t __sector; /* sector cursor */ | |
173 | ||
174 | struct bio *bio; | |
175 | struct bio *biotail; | |
176 | ||
177 | struct hlist_node hash; /* merge hash */ | |
178 | /* | |
179 | * The rb_node is only used inside the io scheduler, requests | |
180 | * are pruned when moved to the dispatch queue. So let the | |
181 | * completion_data share space with the rb_node. | |
182 | */ | |
183 | union { | |
184 | struct rb_node rb_node; /* sort/lookup */ | |
185 | void *completion_data; | |
186 | }; | |
187 | ||
188 | /* | |
189 | * Three pointers are available for the IO schedulers, if they need | |
190 | * more they have to dynamically allocate it. | |
191 | */ | |
192 | void *elevator_private; | |
193 | void *elevator_private2; | |
194 | void *elevator_private3; | |
195 | ||
196 | struct gendisk *rq_disk; | |
197 | unsigned long start_time; | |
198 | #ifdef CONFIG_BLK_CGROUP | |
199 | unsigned long long start_time_ns; | |
200 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
201 | #endif | |
202 | /* Number of scatter-gather DMA addr+len pairs after | |
203 | * physical address coalescing is performed. | |
204 | */ | |
205 | unsigned short nr_phys_segments; | |
206 | ||
207 | unsigned short ioprio; | |
208 | ||
209 | int ref_count; | |
210 | ||
211 | void *special; /* opaque pointer available for LLD use */ | |
212 | char *buffer; /* kaddr of the current segment if available */ | |
213 | ||
214 | int tag; | |
215 | int errors; | |
216 | ||
217 | /* | |
218 | * when request is used as a packet command carrier | |
219 | */ | |
220 | unsigned char __cmd[BLK_MAX_CDB]; | |
221 | unsigned char *cmd; | |
222 | unsigned short cmd_len; | |
223 | ||
224 | unsigned int extra_len; /* length of alignment and padding */ | |
225 | unsigned int sense_len; | |
226 | unsigned int resid_len; /* residual count */ | |
227 | void *sense; | |
228 | ||
229 | unsigned long deadline; | |
230 | struct list_head timeout_list; | |
231 | unsigned int timeout; | |
232 | int retries; | |
233 | ||
234 | /* | |
235 | * completion callback. | |
236 | */ | |
237 | rq_end_io_fn *end_io; | |
238 | void *end_io_data; | |
239 | ||
240 | /* for bidi */ | |
241 | struct request *next_rq; | |
242 | }; | |
243 | ||
244 | static inline unsigned short req_get_ioprio(struct request *req) | |
245 | { | |
246 | return req->ioprio; | |
247 | } | |
248 | ||
249 | /* | |
250 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME | |
251 | * requests. Some step values could eventually be made generic. | |
252 | */ | |
253 | struct request_pm_state | |
254 | { | |
255 | /* PM state machine step value, currently driver specific */ | |
256 | int pm_step; | |
257 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
258 | u32 pm_state; | |
259 | void* data; /* for driver use */ | |
260 | }; | |
261 | ||
262 | #include <linux/elevator.h> | |
263 | ||
264 | typedef void (request_fn_proc) (struct request_queue *q); | |
265 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
266 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
267 | typedef void (unplug_fn) (struct request_queue *); | |
268 | ||
269 | struct bio_vec; | |
270 | struct bvec_merge_data { | |
271 | struct block_device *bi_bdev; | |
272 | sector_t bi_sector; | |
273 | unsigned bi_size; | |
274 | unsigned long bi_rw; | |
275 | }; | |
276 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
277 | struct bio_vec *); | |
278 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); | |
279 | typedef void (softirq_done_fn)(struct request *); | |
280 | typedef int (dma_drain_needed_fn)(struct request *); | |
281 | typedef int (lld_busy_fn) (struct request_queue *q); | |
282 | ||
283 | enum blk_eh_timer_return { | |
284 | BLK_EH_NOT_HANDLED, | |
285 | BLK_EH_HANDLED, | |
286 | BLK_EH_RESET_TIMER, | |
287 | }; | |
288 | ||
289 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
290 | ||
291 | enum blk_queue_state { | |
292 | Queue_down, | |
293 | Queue_up, | |
294 | }; | |
295 | ||
296 | struct blk_queue_tag { | |
297 | struct request **tag_index; /* map of busy tags */ | |
298 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
299 | int busy; /* current depth */ | |
300 | int max_depth; /* what we will send to device */ | |
301 | int real_max_depth; /* what the array can hold */ | |
302 | atomic_t refcnt; /* map can be shared */ | |
303 | }; | |
304 | ||
305 | #define BLK_SCSI_MAX_CMDS (256) | |
306 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
307 | ||
308 | struct queue_limits { | |
309 | unsigned long bounce_pfn; | |
310 | unsigned long seg_boundary_mask; | |
311 | ||
312 | unsigned int max_hw_sectors; | |
313 | unsigned int max_sectors; | |
314 | unsigned int max_segment_size; | |
315 | unsigned int physical_block_size; | |
316 | unsigned int alignment_offset; | |
317 | unsigned int io_min; | |
318 | unsigned int io_opt; | |
319 | unsigned int max_discard_sectors; | |
320 | unsigned int discard_granularity; | |
321 | unsigned int discard_alignment; | |
322 | ||
323 | unsigned short logical_block_size; | |
324 | unsigned short max_segments; | |
325 | ||
326 | unsigned char misaligned; | |
327 | unsigned char discard_misaligned; | |
328 | unsigned char no_cluster; | |
329 | signed char discard_zeroes_data; | |
330 | }; | |
331 | ||
332 | struct request_queue | |
333 | { | |
334 | /* | |
335 | * Together with queue_head for cacheline sharing | |
336 | */ | |
337 | struct list_head queue_head; | |
338 | struct request *last_merge; | |
339 | struct elevator_queue *elevator; | |
340 | ||
341 | /* | |
342 | * the queue request freelist, one for reads and one for writes | |
343 | */ | |
344 | struct request_list rq; | |
345 | ||
346 | request_fn_proc *request_fn; | |
347 | make_request_fn *make_request_fn; | |
348 | prep_rq_fn *prep_rq_fn; | |
349 | unplug_fn *unplug_fn; | |
350 | merge_bvec_fn *merge_bvec_fn; | |
351 | prepare_flush_fn *prepare_flush_fn; | |
352 | softirq_done_fn *softirq_done_fn; | |
353 | rq_timed_out_fn *rq_timed_out_fn; | |
354 | dma_drain_needed_fn *dma_drain_needed; | |
355 | lld_busy_fn *lld_busy_fn; | |
356 | ||
357 | /* | |
358 | * Dispatch queue sorting | |
359 | */ | |
360 | sector_t end_sector; | |
361 | struct request *boundary_rq; | |
362 | ||
363 | /* | |
364 | * Auto-unplugging state | |
365 | */ | |
366 | struct timer_list unplug_timer; | |
367 | int unplug_thresh; /* After this many requests */ | |
368 | unsigned long unplug_delay; /* After this many jiffies */ | |
369 | struct work_struct unplug_work; | |
370 | ||
371 | struct backing_dev_info backing_dev_info; | |
372 | ||
373 | /* | |
374 | * The queue owner gets to use this for whatever they like. | |
375 | * ll_rw_blk doesn't touch it. | |
376 | */ | |
377 | void *queuedata; | |
378 | ||
379 | /* | |
380 | * queue needs bounce pages for pages above this limit | |
381 | */ | |
382 | gfp_t bounce_gfp; | |
383 | ||
384 | /* | |
385 | * various queue flags, see QUEUE_* below | |
386 | */ | |
387 | unsigned long queue_flags; | |
388 | ||
389 | /* | |
390 | * protects queue structures from reentrancy. ->__queue_lock should | |
391 | * _never_ be used directly, it is queue private. always use | |
392 | * ->queue_lock. | |
393 | */ | |
394 | spinlock_t __queue_lock; | |
395 | spinlock_t *queue_lock; | |
396 | ||
397 | /* | |
398 | * queue kobject | |
399 | */ | |
400 | struct kobject kobj; | |
401 | ||
402 | /* | |
403 | * queue settings | |
404 | */ | |
405 | unsigned long nr_requests; /* Max # of requests */ | |
406 | unsigned int nr_congestion_on; | |
407 | unsigned int nr_congestion_off; | |
408 | unsigned int nr_batching; | |
409 | ||
410 | void *dma_drain_buffer; | |
411 | unsigned int dma_drain_size; | |
412 | unsigned int dma_pad_mask; | |
413 | unsigned int dma_alignment; | |
414 | ||
415 | struct blk_queue_tag *queue_tags; | |
416 | struct list_head tag_busy_list; | |
417 | ||
418 | unsigned int nr_sorted; | |
419 | unsigned int in_flight[2]; | |
420 | ||
421 | unsigned int rq_timeout; | |
422 | struct timer_list timeout; | |
423 | struct list_head timeout_list; | |
424 | ||
425 | struct queue_limits limits; | |
426 | ||
427 | /* | |
428 | * sg stuff | |
429 | */ | |
430 | unsigned int sg_timeout; | |
431 | unsigned int sg_reserved_size; | |
432 | int node; | |
433 | #ifdef CONFIG_BLK_DEV_IO_TRACE | |
434 | struct blk_trace *blk_trace; | |
435 | #endif | |
436 | /* | |
437 | * reserved for flush operations | |
438 | */ | |
439 | unsigned int ordered, next_ordered, ordseq; | |
440 | int orderr, ordcolor; | |
441 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
442 | struct request *orig_bar_rq; | |
443 | ||
444 | struct mutex sysfs_lock; | |
445 | ||
446 | #if defined(CONFIG_BLK_DEV_BSG) | |
447 | struct bsg_class_device bsg_dev; | |
448 | #endif | |
449 | }; | |
450 | ||
451 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ | |
452 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
453 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
454 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ | |
455 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
456 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ | |
457 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
458 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
459 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ | |
460 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ | |
461 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ | |
462 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ | |
463 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ | |
464 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ | |
465 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ | |
466 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ | |
467 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ | |
468 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ | |
469 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ | |
470 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ | |
471 | ||
472 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
473 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
474 | (1 << QUEUE_FLAG_STACKABLE) | \ | |
475 | (1 << QUEUE_FLAG_SAME_COMP) | \ | |
476 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
477 | ||
478 | static inline int queue_is_locked(struct request_queue *q) | |
479 | { | |
480 | #ifdef CONFIG_SMP | |
481 | spinlock_t *lock = q->queue_lock; | |
482 | return lock && spin_is_locked(lock); | |
483 | #else | |
484 | return 1; | |
485 | #endif | |
486 | } | |
487 | ||
488 | static inline void queue_flag_set_unlocked(unsigned int flag, | |
489 | struct request_queue *q) | |
490 | { | |
491 | __set_bit(flag, &q->queue_flags); | |
492 | } | |
493 | ||
494 | static inline int queue_flag_test_and_clear(unsigned int flag, | |
495 | struct request_queue *q) | |
496 | { | |
497 | WARN_ON_ONCE(!queue_is_locked(q)); | |
498 | ||
499 | if (test_bit(flag, &q->queue_flags)) { | |
500 | __clear_bit(flag, &q->queue_flags); | |
501 | return 1; | |
502 | } | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static inline int queue_flag_test_and_set(unsigned int flag, | |
508 | struct request_queue *q) | |
509 | { | |
510 | WARN_ON_ONCE(!queue_is_locked(q)); | |
511 | ||
512 | if (!test_bit(flag, &q->queue_flags)) { | |
513 | __set_bit(flag, &q->queue_flags); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | return 1; | |
518 | } | |
519 | ||
520 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) | |
521 | { | |
522 | WARN_ON_ONCE(!queue_is_locked(q)); | |
523 | __set_bit(flag, &q->queue_flags); | |
524 | } | |
525 | ||
526 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
527 | struct request_queue *q) | |
528 | { | |
529 | __clear_bit(flag, &q->queue_flags); | |
530 | } | |
531 | ||
532 | static inline int queue_in_flight(struct request_queue *q) | |
533 | { | |
534 | return q->in_flight[0] + q->in_flight[1]; | |
535 | } | |
536 | ||
537 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
538 | { | |
539 | WARN_ON_ONCE(!queue_is_locked(q)); | |
540 | __clear_bit(flag, &q->queue_flags); | |
541 | } | |
542 | ||
543 | enum { | |
544 | /* | |
545 | * Hardbarrier is supported with one of the following methods. | |
546 | * | |
547 | * NONE : hardbarrier unsupported | |
548 | * DRAIN : ordering by draining is enough | |
549 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
550 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
551 | * TAG : ordering by tag is enough | |
552 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
553 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
554 | */ | |
555 | QUEUE_ORDERED_BY_DRAIN = 0x01, | |
556 | QUEUE_ORDERED_BY_TAG = 0x02, | |
557 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, | |
558 | QUEUE_ORDERED_DO_BAR = 0x20, | |
559 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, | |
560 | QUEUE_ORDERED_DO_FUA = 0x80, | |
561 | ||
562 | QUEUE_ORDERED_NONE = 0x00, | |
563 | ||
564 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | | |
565 | QUEUE_ORDERED_DO_BAR, | |
566 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | | |
567 | QUEUE_ORDERED_DO_PREFLUSH | | |
568 | QUEUE_ORDERED_DO_POSTFLUSH, | |
569 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
570 | QUEUE_ORDERED_DO_PREFLUSH | | |
571 | QUEUE_ORDERED_DO_FUA, | |
572 | ||
573 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | | |
574 | QUEUE_ORDERED_DO_BAR, | |
575 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | | |
576 | QUEUE_ORDERED_DO_PREFLUSH | | |
577 | QUEUE_ORDERED_DO_POSTFLUSH, | |
578 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
579 | QUEUE_ORDERED_DO_PREFLUSH | | |
580 | QUEUE_ORDERED_DO_FUA, | |
581 | ||
582 | /* | |
583 | * Ordered operation sequence | |
584 | */ | |
585 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
586 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
587 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
588 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
589 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
590 | QUEUE_ORDSEQ_DONE = 0x20, | |
591 | }; | |
592 | ||
593 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
594 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
595 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
596 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) | |
597 | #define blk_queue_noxmerges(q) \ | |
598 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
599 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) | |
600 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) | |
601 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) | |
602 | #define blk_queue_flushing(q) ((q)->ordseq) | |
603 | #define blk_queue_stackable(q) \ | |
604 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
605 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) | |
606 | ||
607 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) | |
608 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
609 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
610 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
611 | ||
612 | #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) | |
613 | #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) | |
614 | #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) | |
615 | #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ | |
616 | blk_failfast_transport(rq) || \ | |
617 | blk_failfast_driver(rq)) | |
618 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) | |
619 | #define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT) | |
620 | #define blk_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET) | |
621 | ||
622 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) | |
623 | ||
624 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) | |
625 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
626 | #define blk_pm_request(rq) \ | |
627 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) | |
628 | ||
629 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) | |
630 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) | |
631 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
632 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
633 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) | |
634 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) | |
635 | /* rq->queuelist of dequeued request must be list_empty() */ | |
636 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
637 | ||
638 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
639 | ||
640 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) | |
641 | ||
642 | /* | |
643 | * We regard a request as sync, if either a read or a sync write | |
644 | */ | |
645 | static inline bool rw_is_sync(unsigned int rw_flags) | |
646 | { | |
647 | return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); | |
648 | } | |
649 | ||
650 | static inline bool rq_is_sync(struct request *rq) | |
651 | { | |
652 | return rw_is_sync(rq->cmd_flags); | |
653 | } | |
654 | ||
655 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) | |
656 | #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) | |
657 | ||
658 | static inline int blk_queue_full(struct request_queue *q, int sync) | |
659 | { | |
660 | if (sync) | |
661 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
662 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
663 | } | |
664 | ||
665 | static inline void blk_set_queue_full(struct request_queue *q, int sync) | |
666 | { | |
667 | if (sync) | |
668 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
669 | else | |
670 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); | |
671 | } | |
672 | ||
673 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) | |
674 | { | |
675 | if (sync) | |
676 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
677 | else | |
678 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); | |
679 | } | |
680 | ||
681 | ||
682 | /* | |
683 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
684 | * it already be started by driver. | |
685 | */ | |
686 | #define RQ_NOMERGE_FLAGS \ | |
687 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
688 | #define rq_mergeable(rq) \ | |
689 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ | |
690 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
691 | ||
692 | /* | |
693 | * q->prep_rq_fn return values | |
694 | */ | |
695 | #define BLKPREP_OK 0 /* serve it */ | |
696 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
697 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
698 | ||
699 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
700 | ||
701 | /* | |
702 | * standard bounce addresses: | |
703 | * | |
704 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
705 | * BLK_BOUNCE_ANY : don't bounce anything | |
706 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
707 | */ | |
708 | ||
709 | #if BITS_PER_LONG == 32 | |
710 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) | |
711 | #else | |
712 | #define BLK_BOUNCE_HIGH -1ULL | |
713 | #endif | |
714 | #define BLK_BOUNCE_ANY (-1ULL) | |
715 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) | |
716 | ||
717 | /* | |
718 | * default timeout for SG_IO if none specified | |
719 | */ | |
720 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
721 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) | |
722 | ||
723 | #ifdef CONFIG_BOUNCE | |
724 | extern int init_emergency_isa_pool(void); | |
725 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); | |
726 | #else | |
727 | static inline int init_emergency_isa_pool(void) | |
728 | { | |
729 | return 0; | |
730 | } | |
731 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) | |
732 | { | |
733 | } | |
734 | #endif /* CONFIG_MMU */ | |
735 | ||
736 | struct rq_map_data { | |
737 | struct page **pages; | |
738 | int page_order; | |
739 | int nr_entries; | |
740 | unsigned long offset; | |
741 | int null_mapped; | |
742 | int from_user; | |
743 | }; | |
744 | ||
745 | struct req_iterator { | |
746 | int i; | |
747 | struct bio *bio; | |
748 | }; | |
749 | ||
750 | /* This should not be used directly - use rq_for_each_segment */ | |
751 | #define for_each_bio(_bio) \ | |
752 | for (; _bio; _bio = _bio->bi_next) | |
753 | #define __rq_for_each_bio(_bio, rq) \ | |
754 | if ((rq->bio)) \ | |
755 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
756 | ||
757 | #define rq_for_each_segment(bvl, _rq, _iter) \ | |
758 | __rq_for_each_bio(_iter.bio, _rq) \ | |
759 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
760 | ||
761 | #define rq_iter_last(rq, _iter) \ | |
762 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
763 | ||
764 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
765 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
766 | #endif | |
767 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
768 | extern void rq_flush_dcache_pages(struct request *rq); | |
769 | #else | |
770 | static inline void rq_flush_dcache_pages(struct request *rq) | |
771 | { | |
772 | } | |
773 | #endif | |
774 | ||
775 | extern int blk_register_queue(struct gendisk *disk); | |
776 | extern void blk_unregister_queue(struct gendisk *disk); | |
777 | extern void register_disk(struct gendisk *dev); | |
778 | extern void generic_make_request(struct bio *bio); | |
779 | extern void blk_rq_init(struct request_queue *q, struct request *rq); | |
780 | extern void blk_put_request(struct request *); | |
781 | extern void __blk_put_request(struct request_queue *, struct request *); | |
782 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); | |
783 | extern struct request *blk_make_request(struct request_queue *, struct bio *, | |
784 | gfp_t); | |
785 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
786 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
787 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); | |
788 | extern int blk_lld_busy(struct request_queue *q); | |
789 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, | |
790 | struct bio_set *bs, gfp_t gfp_mask, | |
791 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
792 | void *data); | |
793 | extern void blk_rq_unprep_clone(struct request *rq); | |
794 | extern int blk_insert_cloned_request(struct request_queue *q, | |
795 | struct request *rq); | |
796 | extern void blk_plug_device(struct request_queue *); | |
797 | extern void blk_plug_device_unlocked(struct request_queue *); | |
798 | extern int blk_remove_plug(struct request_queue *); | |
799 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
800 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, | |
801 | unsigned int, void __user *); | |
802 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, | |
803 | struct scsi_ioctl_command __user *); | |
804 | ||
805 | /* | |
806 | * A queue has just exitted congestion. Note this in the global counter of | |
807 | * congested queues, and wake up anyone who was waiting for requests to be | |
808 | * put back. | |
809 | */ | |
810 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) | |
811 | { | |
812 | clear_bdi_congested(&q->backing_dev_info, sync); | |
813 | } | |
814 | ||
815 | /* | |
816 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
817 | * state flags and increment the global gounter of congested queues. | |
818 | */ | |
819 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) | |
820 | { | |
821 | set_bdi_congested(&q->backing_dev_info, sync); | |
822 | } | |
823 | ||
824 | extern void blk_start_queue(struct request_queue *q); | |
825 | extern void blk_stop_queue(struct request_queue *q); | |
826 | extern void blk_sync_queue(struct request_queue *q); | |
827 | extern void __blk_stop_queue(struct request_queue *q); | |
828 | extern void __blk_run_queue(struct request_queue *); | |
829 | extern void blk_run_queue(struct request_queue *); | |
830 | extern int blk_rq_map_user(struct request_queue *, struct request *, | |
831 | struct rq_map_data *, void __user *, unsigned long, | |
832 | gfp_t); | |
833 | extern int blk_rq_unmap_user(struct bio *); | |
834 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); | |
835 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
836 | struct rq_map_data *, struct sg_iovec *, int, | |
837 | unsigned int, gfp_t); | |
838 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, | |
839 | struct request *, int); | |
840 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, | |
841 | struct request *, int, rq_end_io_fn *); | |
842 | extern void blk_unplug(struct request_queue *q); | |
843 | ||
844 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) | |
845 | { | |
846 | return bdev->bd_disk->queue; | |
847 | } | |
848 | ||
849 | /* | |
850 | * blk_rq_pos() : the current sector | |
851 | * blk_rq_bytes() : bytes left in the entire request | |
852 | * blk_rq_cur_bytes() : bytes left in the current segment | |
853 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
854 | * blk_rq_sectors() : sectors left in the entire request | |
855 | * blk_rq_cur_sectors() : sectors left in the current segment | |
856 | */ | |
857 | static inline sector_t blk_rq_pos(const struct request *rq) | |
858 | { | |
859 | return rq->__sector; | |
860 | } | |
861 | ||
862 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
863 | { | |
864 | return rq->__data_len; | |
865 | } | |
866 | ||
867 | static inline int blk_rq_cur_bytes(const struct request *rq) | |
868 | { | |
869 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
870 | } | |
871 | ||
872 | extern unsigned int blk_rq_err_bytes(const struct request *rq); | |
873 | ||
874 | static inline unsigned int blk_rq_sectors(const struct request *rq) | |
875 | { | |
876 | return blk_rq_bytes(rq) >> 9; | |
877 | } | |
878 | ||
879 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
880 | { | |
881 | return blk_rq_cur_bytes(rq) >> 9; | |
882 | } | |
883 | ||
884 | /* | |
885 | * Request issue related functions. | |
886 | */ | |
887 | extern struct request *blk_peek_request(struct request_queue *q); | |
888 | extern void blk_start_request(struct request *rq); | |
889 | extern struct request *blk_fetch_request(struct request_queue *q); | |
890 | ||
891 | /* | |
892 | * Request completion related functions. | |
893 | * | |
894 | * blk_update_request() completes given number of bytes and updates | |
895 | * the request without completing it. | |
896 | * | |
897 | * blk_end_request() and friends. __blk_end_request() must be called | |
898 | * with the request queue spinlock acquired. | |
899 | * | |
900 | * Several drivers define their own end_request and call | |
901 | * blk_end_request() for parts of the original function. | |
902 | * This prevents code duplication in drivers. | |
903 | */ | |
904 | extern bool blk_update_request(struct request *rq, int error, | |
905 | unsigned int nr_bytes); | |
906 | extern bool blk_end_request(struct request *rq, int error, | |
907 | unsigned int nr_bytes); | |
908 | extern void blk_end_request_all(struct request *rq, int error); | |
909 | extern bool blk_end_request_cur(struct request *rq, int error); | |
910 | extern bool blk_end_request_err(struct request *rq, int error); | |
911 | extern bool __blk_end_request(struct request *rq, int error, | |
912 | unsigned int nr_bytes); | |
913 | extern void __blk_end_request_all(struct request *rq, int error); | |
914 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
915 | extern bool __blk_end_request_err(struct request *rq, int error); | |
916 | ||
917 | extern void blk_complete_request(struct request *); | |
918 | extern void __blk_complete_request(struct request *); | |
919 | extern void blk_abort_request(struct request *); | |
920 | extern void blk_abort_queue(struct request_queue *); | |
921 | ||
922 | /* | |
923 | * Access functions for manipulating queue properties | |
924 | */ | |
925 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, | |
926 | spinlock_t *lock, int node_id); | |
927 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, | |
928 | request_fn_proc *, | |
929 | spinlock_t *, int node_id); | |
930 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); | |
931 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, | |
932 | request_fn_proc *, spinlock_t *); | |
933 | extern void blk_cleanup_queue(struct request_queue *); | |
934 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
935 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
936 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); | |
937 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); | |
938 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
939 | extern void blk_queue_max_discard_sectors(struct request_queue *q, | |
940 | unsigned int max_discard_sectors); | |
941 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); | |
942 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); | |
943 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
944 | unsigned int alignment); | |
945 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); | |
946 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); | |
947 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); | |
948 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); | |
949 | extern void blk_set_default_limits(struct queue_limits *lim); | |
950 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, | |
951 | sector_t offset); | |
952 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, | |
953 | sector_t offset); | |
954 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, | |
955 | sector_t offset); | |
956 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
957 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); | |
958 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); | |
959 | extern int blk_queue_dma_drain(struct request_queue *q, | |
960 | dma_drain_needed_fn *dma_drain_needed, | |
961 | void *buf, unsigned int size); | |
962 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); | |
963 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); | |
964 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
965 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
966 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
967 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); | |
968 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); | |
969 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); | |
970 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
971 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); | |
972 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); | |
973 | extern bool blk_do_ordered(struct request_queue *, struct request **); | |
974 | extern unsigned blk_ordered_cur_seq(struct request_queue *); | |
975 | extern unsigned blk_ordered_req_seq(struct request *); | |
976 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); | |
977 | ||
978 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); | |
979 | extern void blk_dump_rq_flags(struct request *, char *); | |
980 | extern void generic_unplug_device(struct request_queue *); | |
981 | extern long nr_blockdev_pages(void); | |
982 | ||
983 | int blk_get_queue(struct request_queue *); | |
984 | struct request_queue *blk_alloc_queue(gfp_t); | |
985 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
986 | extern void blk_put_queue(struct request_queue *); | |
987 | ||
988 | /* | |
989 | * tag stuff | |
990 | */ | |
991 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) | |
992 | extern int blk_queue_start_tag(struct request_queue *, struct request *); | |
993 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
994 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
995 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
996 | extern void blk_queue_free_tags(struct request_queue *); | |
997 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
998 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
999 | extern struct blk_queue_tag *blk_init_tags(int); | |
1000 | extern void blk_free_tags(struct blk_queue_tag *); | |
1001 | ||
1002 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, | |
1003 | int tag) | |
1004 | { | |
1005 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1006 | return NULL; | |
1007 | return bqt->tag_index[tag]; | |
1008 | } | |
1009 | enum{ | |
1010 | BLKDEV_WAIT, /* wait for completion */ | |
1011 | BLKDEV_BARRIER, /*issue request with barrier */ | |
1012 | }; | |
1013 | #define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) | |
1014 | #define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER) | |
1015 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, | |
1016 | unsigned long); | |
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, unsigned long flags); | |
1021 | static inline int sb_issue_discard(struct super_block *sb, | |
1022 | sector_t block, sector_t nr_blocks) | |
1023 | { | |
1024 | block <<= (sb->s_blocksize_bits - 9); | |
1025 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
1026 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, | |
1027 | BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); | |
1028 | } | |
1029 | ||
1030 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); | |
1031 | ||
1032 | enum blk_default_limits { | |
1033 | BLK_MAX_SEGMENTS = 128, | |
1034 | BLK_SAFE_MAX_SECTORS = 255, | |
1035 | BLK_DEF_MAX_SECTORS = 1024, | |
1036 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1037 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1038 | }; | |
1039 | ||
1040 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) | |
1041 | ||
1042 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) | |
1043 | { | |
1044 | return q->limits.bounce_pfn; | |
1045 | } | |
1046 | ||
1047 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1048 | { | |
1049 | return q->limits.seg_boundary_mask; | |
1050 | } | |
1051 | ||
1052 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1053 | { | |
1054 | return q->limits.max_sectors; | |
1055 | } | |
1056 | ||
1057 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1058 | { | |
1059 | return q->limits.max_hw_sectors; | |
1060 | } | |
1061 | ||
1062 | static inline unsigned short queue_max_segments(struct request_queue *q) | |
1063 | { | |
1064 | return q->limits.max_segments; | |
1065 | } | |
1066 | ||
1067 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1068 | { | |
1069 | return q->limits.max_segment_size; | |
1070 | } | |
1071 | ||
1072 | static inline unsigned short queue_logical_block_size(struct request_queue *q) | |
1073 | { | |
1074 | int retval = 512; | |
1075 | ||
1076 | if (q && q->limits.logical_block_size) | |
1077 | retval = q->limits.logical_block_size; | |
1078 | ||
1079 | return retval; | |
1080 | } | |
1081 | ||
1082 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) | |
1083 | { | |
1084 | return queue_logical_block_size(bdev_get_queue(bdev)); | |
1085 | } | |
1086 | ||
1087 | static inline unsigned int queue_physical_block_size(struct request_queue *q) | |
1088 | { | |
1089 | return q->limits.physical_block_size; | |
1090 | } | |
1091 | ||
1092 | static inline int bdev_physical_block_size(struct block_device *bdev) | |
1093 | { | |
1094 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1095 | } | |
1096 | ||
1097 | static inline unsigned int queue_io_min(struct request_queue *q) | |
1098 | { | |
1099 | return q->limits.io_min; | |
1100 | } | |
1101 | ||
1102 | static inline int bdev_io_min(struct block_device *bdev) | |
1103 | { | |
1104 | return queue_io_min(bdev_get_queue(bdev)); | |
1105 | } | |
1106 | ||
1107 | static inline unsigned int queue_io_opt(struct request_queue *q) | |
1108 | { | |
1109 | return q->limits.io_opt; | |
1110 | } | |
1111 | ||
1112 | static inline int bdev_io_opt(struct block_device *bdev) | |
1113 | { | |
1114 | return queue_io_opt(bdev_get_queue(bdev)); | |
1115 | } | |
1116 | ||
1117 | static inline int queue_alignment_offset(struct request_queue *q) | |
1118 | { | |
1119 | if (q->limits.misaligned) | |
1120 | return -1; | |
1121 | ||
1122 | return q->limits.alignment_offset; | |
1123 | } | |
1124 | ||
1125 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) | |
1126 | { | |
1127 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
1128 | unsigned int alignment = (sector << 9) & (granularity - 1); | |
1129 | ||
1130 | return (granularity + lim->alignment_offset - alignment) | |
1131 | & (granularity - 1); | |
1132 | } | |
1133 | ||
1134 | static inline int bdev_alignment_offset(struct block_device *bdev) | |
1135 | { | |
1136 | struct request_queue *q = bdev_get_queue(bdev); | |
1137 | ||
1138 | if (q->limits.misaligned) | |
1139 | return -1; | |
1140 | ||
1141 | if (bdev != bdev->bd_contains) | |
1142 | return bdev->bd_part->alignment_offset; | |
1143 | ||
1144 | return q->limits.alignment_offset; | |
1145 | } | |
1146 | ||
1147 | static inline int queue_discard_alignment(struct request_queue *q) | |
1148 | { | |
1149 | if (q->limits.discard_misaligned) | |
1150 | return -1; | |
1151 | ||
1152 | return q->limits.discard_alignment; | |
1153 | } | |
1154 | ||
1155 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) | |
1156 | { | |
1157 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); | |
1158 | ||
1159 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1160 | & (lim->discard_granularity - 1); | |
1161 | } | |
1162 | ||
1163 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) | |
1164 | { | |
1165 | if (q->limits.discard_zeroes_data == 1) | |
1166 | return 1; | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1172 | { | |
1173 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1174 | } | |
1175 | ||
1176 | static inline int queue_dma_alignment(struct request_queue *q) | |
1177 | { | |
1178 | return q ? q->dma_alignment : 511; | |
1179 | } | |
1180 | ||
1181 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, | |
1182 | unsigned int len) | |
1183 | { | |
1184 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1185 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1186 | } | |
1187 | ||
1188 | /* assumes size > 256 */ | |
1189 | static inline unsigned int blksize_bits(unsigned int size) | |
1190 | { | |
1191 | unsigned int bits = 8; | |
1192 | do { | |
1193 | bits++; | |
1194 | size >>= 1; | |
1195 | } while (size > 256); | |
1196 | return bits; | |
1197 | } | |
1198 | ||
1199 | static inline unsigned int block_size(struct block_device *bdev) | |
1200 | { | |
1201 | return bdev->bd_block_size; | |
1202 | } | |
1203 | ||
1204 | typedef struct {struct page *v;} Sector; | |
1205 | ||
1206 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1207 | ||
1208 | static inline void put_dev_sector(Sector p) | |
1209 | { | |
1210 | page_cache_release(p.v); | |
1211 | } | |
1212 | ||
1213 | struct work_struct; | |
1214 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); | |
1215 | ||
1216 | #ifdef CONFIG_BLK_CGROUP | |
1217 | /* | |
1218 | * This should not be using sched_clock(). A real patch is in progress | |
1219 | * to fix this up, until that is in place we need to disable preemption | |
1220 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1221 | */ | |
1222 | static inline void set_start_time_ns(struct request *req) | |
1223 | { | |
1224 | preempt_disable(); | |
1225 | req->start_time_ns = sched_clock(); | |
1226 | preempt_enable(); | |
1227 | } | |
1228 | ||
1229 | static inline void set_io_start_time_ns(struct request *req) | |
1230 | { | |
1231 | preempt_disable(); | |
1232 | req->io_start_time_ns = sched_clock(); | |
1233 | preempt_enable(); | |
1234 | } | |
1235 | ||
1236 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1237 | { | |
1238 | return req->start_time_ns; | |
1239 | } | |
1240 | ||
1241 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1242 | { | |
1243 | return req->io_start_time_ns; | |
1244 | } | |
1245 | #else | |
1246 | static inline void set_start_time_ns(struct request *req) {} | |
1247 | static inline void set_io_start_time_ns(struct request *req) {} | |
1248 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1249 | { | |
1250 | return 0; | |
1251 | } | |
1252 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1253 | { | |
1254 | return 0; | |
1255 | } | |
1256 | #endif | |
1257 | ||
1258 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ | |
1259 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1260 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1261 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1262 | ||
1263 | #if defined(CONFIG_BLK_DEV_INTEGRITY) | |
1264 | ||
1265 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ | |
1266 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
1267 | ||
1268 | struct blk_integrity_exchg { | |
1269 | void *prot_buf; | |
1270 | void *data_buf; | |
1271 | sector_t sector; | |
1272 | unsigned int data_size; | |
1273 | unsigned short sector_size; | |
1274 | const char *disk_name; | |
1275 | }; | |
1276 | ||
1277 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1278 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1279 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1280 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1281 | ||
1282 | struct blk_integrity { | |
1283 | integrity_gen_fn *generate_fn; | |
1284 | integrity_vrfy_fn *verify_fn; | |
1285 | integrity_set_tag_fn *set_tag_fn; | |
1286 | integrity_get_tag_fn *get_tag_fn; | |
1287 | ||
1288 | unsigned short flags; | |
1289 | unsigned short tuple_size; | |
1290 | unsigned short sector_size; | |
1291 | unsigned short tag_size; | |
1292 | ||
1293 | const char *name; | |
1294 | ||
1295 | struct kobject kobj; | |
1296 | }; | |
1297 | ||
1298 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1299 | extern void blk_integrity_unregister(struct gendisk *); | |
1300 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); | |
1301 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); | |
1302 | extern int blk_rq_count_integrity_sg(struct request *); | |
1303 | ||
1304 | static inline | |
1305 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1306 | { | |
1307 | return bdev->bd_disk->integrity; | |
1308 | } | |
1309 | ||
1310 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1311 | { | |
1312 | return disk->integrity; | |
1313 | } | |
1314 | ||
1315 | static inline int blk_integrity_rq(struct request *rq) | |
1316 | { | |
1317 | if (rq->bio == NULL) | |
1318 | return 0; | |
1319 | ||
1320 | return bio_integrity(rq->bio); | |
1321 | } | |
1322 | ||
1323 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1324 | ||
1325 | #define blk_integrity_rq(rq) (0) | |
1326 | #define blk_rq_count_integrity_sg(a) (0) | |
1327 | #define blk_rq_map_integrity_sg(a, b) (0) | |
1328 | #define bdev_get_integrity(a) (0) | |
1329 | #define blk_get_integrity(a) (0) | |
1330 | #define blk_integrity_compare(a, b) (0) | |
1331 | #define blk_integrity_register(a, b) (0) | |
1332 | #define blk_integrity_unregister(a) do { } while (0); | |
1333 | ||
1334 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1335 | ||
1336 | struct block_device_operations { | |
1337 | int (*open) (struct block_device *, fmode_t); | |
1338 | int (*release) (struct gendisk *, fmode_t); | |
1339 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1340 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1341 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1342 | int (*direct_access) (struct block_device *, sector_t, | |
1343 | void **, unsigned long *); | |
1344 | int (*media_changed) (struct gendisk *); | |
1345 | void (*unlock_native_capacity) (struct gendisk *); | |
1346 | int (*revalidate_disk) (struct gendisk *); | |
1347 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
1348 | /* this callback is with swap_lock and sometimes page table lock held */ | |
1349 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
1350 | struct module *owner; | |
1351 | }; | |
1352 | ||
1353 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, | |
1354 | unsigned long); | |
1355 | #else /* CONFIG_BLOCK */ | |
1356 | /* | |
1357 | * stubs for when the block layer is configured out | |
1358 | */ | |
1359 | #define buffer_heads_over_limit 0 | |
1360 | ||
1361 | static inline long nr_blockdev_pages(void) | |
1362 | { | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | #endif /* CONFIG_BLOCK */ | |
1367 | ||
1368 | #endif |