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