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1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
85fd0bc9 RK |
4 | #include <linux/sched.h> |
5 | ||
f5ff8422 JA |
6 | #ifdef CONFIG_BLOCK |
7 | ||
1da177e4 LT |
8 | #include <linux/major.h> |
9 | #include <linux/genhd.h> | |
10 | #include <linux/list.h> | |
320ae51f | 11 | #include <linux/llist.h> |
1da177e4 LT |
12 | #include <linux/timer.h> |
13 | #include <linux/workqueue.h> | |
14 | #include <linux/pagemap.h> | |
66114cad | 15 | #include <linux/backing-dev-defs.h> |
1da177e4 LT |
16 | #include <linux/wait.h> |
17 | #include <linux/mempool.h> | |
18 | #include <linux/bio.h> | |
1da177e4 | 19 | #include <linux/stringify.h> |
3e6053d7 | 20 | #include <linux/gfp.h> |
d351af01 | 21 | #include <linux/bsg.h> |
c7c22e4d | 22 | #include <linux/smp.h> |
548bc8e1 | 23 | #include <linux/rcupdate.h> |
add703fd | 24 | #include <linux/percpu-refcount.h> |
84be456f | 25 | #include <linux/scatterlist.h> |
1da177e4 | 26 | |
de477254 | 27 | struct module; |
21b2f0c8 CH |
28 | struct scsi_ioctl_command; |
29 | ||
1da177e4 | 30 | struct request_queue; |
1da177e4 | 31 | struct elevator_queue; |
2056a782 | 32 | struct blk_trace; |
3d6392cf JA |
33 | struct request; |
34 | struct sg_io_hdr; | |
aa387cc8 | 35 | struct bsg_job; |
3c798398 | 36 | struct blkcg_gq; |
7c94e1c1 | 37 | struct blk_flush_queue; |
1da177e4 LT |
38 | |
39 | #define BLKDEV_MIN_RQ 4 | |
40 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
41 | ||
8bd435b3 TH |
42 | /* |
43 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
44 | * Defined here to simplify include dependency. | |
45 | */ | |
46 | #define BLKCG_MAX_POLS 2 | |
47 | ||
1da177e4 | 48 | struct request; |
8ffdc655 | 49 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 50 | |
5b788ce3 TH |
51 | #define BLK_RL_SYNCFULL (1U << 0) |
52 | #define BLK_RL_ASYNCFULL (1U << 1) | |
53 | ||
1da177e4 | 54 | struct request_list { |
5b788ce3 | 55 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
56 | #ifdef CONFIG_BLK_CGROUP |
57 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
58 | #endif | |
1faa16d2 JA |
59 | /* |
60 | * count[], starved[], and wait[] are indexed by | |
61 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
62 | */ | |
8a5ecdd4 TH |
63 | int count[2]; |
64 | int starved[2]; | |
65 | mempool_t *rq_pool; | |
66 | wait_queue_head_t wait[2]; | |
5b788ce3 | 67 | unsigned int flags; |
1da177e4 LT |
68 | }; |
69 | ||
4aff5e23 JA |
70 | /* |
71 | * request command types | |
72 | */ | |
73 | enum rq_cmd_type_bits { | |
74 | REQ_TYPE_FS = 1, /* fs request */ | |
75 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
b42171ef | 76 | REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
4aff5e23 JA |
77 | }; |
78 | ||
1da177e4 LT |
79 | #define BLK_MAX_CDB 16 |
80 | ||
81 | /* | |
af76e555 CH |
82 | * Try to put the fields that are referenced together in the same cacheline. |
83 | * | |
84 | * If you modify this structure, make sure to update blk_rq_init() and | |
85 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
86 | */ |
87 | struct request { | |
6897fc22 | 88 | struct list_head queuelist; |
320ae51f JA |
89 | union { |
90 | struct call_single_data csd; | |
8b4922d3 | 91 | unsigned long fifo_time; |
320ae51f | 92 | }; |
ff856bad | 93 | |
165125e1 | 94 | struct request_queue *q; |
320ae51f | 95 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 96 | |
5953316d | 97 | u64 cmd_flags; |
b42171ef | 98 | unsigned cmd_type; |
242f9dcb | 99 | unsigned long atomic_flags; |
1da177e4 | 100 | |
181fdde3 RK |
101 | int cpu; |
102 | ||
a2dec7b3 | 103 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 104 | unsigned int __data_len; /* total data len */ |
181fdde3 | 105 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
106 | |
107 | struct bio *bio; | |
108 | struct bio *biotail; | |
109 | ||
360f92c2 JA |
110 | /* |
111 | * The hash is used inside the scheduler, and killed once the | |
112 | * request reaches the dispatch list. The ipi_list is only used | |
113 | * to queue the request for softirq completion, which is long | |
114 | * after the request has been unhashed (and even removed from | |
115 | * the dispatch list). | |
116 | */ | |
117 | union { | |
118 | struct hlist_node hash; /* merge hash */ | |
119 | struct list_head ipi_list; | |
120 | }; | |
121 | ||
e6a1c874 JA |
122 | /* |
123 | * The rb_node is only used inside the io scheduler, requests | |
124 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 125 | * completion_data share space with the rb_node. |
e6a1c874 JA |
126 | */ |
127 | union { | |
128 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 129 | void *completion_data; |
e6a1c874 | 130 | }; |
9817064b | 131 | |
ff7d145f | 132 | /* |
7f1dc8a2 | 133 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
134 | * more they have to dynamically allocate it. Flush requests are |
135 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 136 | * space with the elevator data. |
ff7d145f | 137 | */ |
c186794d | 138 | union { |
a612fddf TH |
139 | struct { |
140 | struct io_cq *icq; | |
141 | void *priv[2]; | |
142 | } elv; | |
143 | ||
c186794d MS |
144 | struct { |
145 | unsigned int seq; | |
146 | struct list_head list; | |
4853abaa | 147 | rq_end_io_fn *saved_end_io; |
c186794d MS |
148 | } flush; |
149 | }; | |
ff7d145f | 150 | |
8f34ee75 | 151 | struct gendisk *rq_disk; |
09e099d4 | 152 | struct hd_struct *part; |
1da177e4 | 153 | unsigned long start_time; |
9195291e | 154 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 155 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
156 | unsigned long long start_time_ns; |
157 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
158 | #endif | |
1da177e4 LT |
159 | /* Number of scatter-gather DMA addr+len pairs after |
160 | * physical address coalescing is performed. | |
161 | */ | |
162 | unsigned short nr_phys_segments; | |
13f05c8d MP |
163 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
164 | unsigned short nr_integrity_segments; | |
165 | #endif | |
1da177e4 | 166 | |
8f34ee75 JA |
167 | unsigned short ioprio; |
168 | ||
731ec497 | 169 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 170 | |
cdd60262 JA |
171 | int tag; |
172 | int errors; | |
173 | ||
1da177e4 LT |
174 | /* |
175 | * when request is used as a packet command carrier | |
176 | */ | |
d7e3c324 FT |
177 | unsigned char __cmd[BLK_MAX_CDB]; |
178 | unsigned char *cmd; | |
181fdde3 | 179 | unsigned short cmd_len; |
1da177e4 | 180 | |
7a85f889 | 181 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 182 | unsigned int sense_len; |
c3a4d78c | 183 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
184 | void *sense; |
185 | ||
242f9dcb JA |
186 | unsigned long deadline; |
187 | struct list_head timeout_list; | |
1da177e4 | 188 | unsigned int timeout; |
17e01f21 | 189 | int retries; |
1da177e4 | 190 | |
1da177e4 | 191 | /* |
c00895ab | 192 | * completion callback. |
1da177e4 LT |
193 | */ |
194 | rq_end_io_fn *end_io; | |
195 | void *end_io_data; | |
abae1fde FT |
196 | |
197 | /* for bidi */ | |
198 | struct request *next_rq; | |
1da177e4 LT |
199 | }; |
200 | ||
766ca442 FLVC |
201 | static inline unsigned short req_get_ioprio(struct request *req) |
202 | { | |
203 | return req->ioprio; | |
204 | } | |
205 | ||
1da177e4 LT |
206 | #include <linux/elevator.h> |
207 | ||
320ae51f JA |
208 | struct blk_queue_ctx; |
209 | ||
165125e1 | 210 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 211 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 212 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 213 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
214 | |
215 | struct bio_vec; | |
cc371e66 AK |
216 | struct bvec_merge_data { |
217 | struct block_device *bi_bdev; | |
218 | sector_t bi_sector; | |
219 | unsigned bi_size; | |
220 | unsigned long bi_rw; | |
221 | }; | |
222 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
223 | struct bio_vec *); | |
ff856bad | 224 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 225 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 226 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 227 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 228 | |
242f9dcb JA |
229 | enum blk_eh_timer_return { |
230 | BLK_EH_NOT_HANDLED, | |
231 | BLK_EH_HANDLED, | |
232 | BLK_EH_RESET_TIMER, | |
233 | }; | |
234 | ||
235 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
236 | ||
1da177e4 LT |
237 | enum blk_queue_state { |
238 | Queue_down, | |
239 | Queue_up, | |
240 | }; | |
241 | ||
1da177e4 LT |
242 | struct blk_queue_tag { |
243 | struct request **tag_index; /* map of busy tags */ | |
244 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
245 | int busy; /* current depth */ |
246 | int max_depth; /* what we will send to device */ | |
ba025082 | 247 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 248 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
249 | int alloc_policy; /* tag allocation policy */ |
250 | int next_tag; /* next tag */ | |
1da177e4 | 251 | }; |
ee1b6f7a SL |
252 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
253 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 254 | |
abf54393 FT |
255 | #define BLK_SCSI_MAX_CMDS (256) |
256 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
257 | ||
025146e1 MP |
258 | struct queue_limits { |
259 | unsigned long bounce_pfn; | |
260 | unsigned long seg_boundary_mask; | |
261 | ||
262 | unsigned int max_hw_sectors; | |
762380ad | 263 | unsigned int chunk_sectors; |
025146e1 MP |
264 | unsigned int max_sectors; |
265 | unsigned int max_segment_size; | |
c72758f3 MP |
266 | unsigned int physical_block_size; |
267 | unsigned int alignment_offset; | |
268 | unsigned int io_min; | |
269 | unsigned int io_opt; | |
67efc925 | 270 | unsigned int max_discard_sectors; |
4363ac7c | 271 | unsigned int max_write_same_sectors; |
86b37281 MP |
272 | unsigned int discard_granularity; |
273 | unsigned int discard_alignment; | |
025146e1 MP |
274 | |
275 | unsigned short logical_block_size; | |
8a78362c | 276 | unsigned short max_segments; |
13f05c8d | 277 | unsigned short max_integrity_segments; |
025146e1 | 278 | |
c72758f3 | 279 | unsigned char misaligned; |
86b37281 | 280 | unsigned char discard_misaligned; |
e692cb66 | 281 | unsigned char cluster; |
a934a00a | 282 | unsigned char discard_zeroes_data; |
c78afc62 | 283 | unsigned char raid_partial_stripes_expensive; |
025146e1 MP |
284 | }; |
285 | ||
d7b76301 | 286 | struct request_queue { |
1da177e4 LT |
287 | /* |
288 | * Together with queue_head for cacheline sharing | |
289 | */ | |
290 | struct list_head queue_head; | |
291 | struct request *last_merge; | |
b374d18a | 292 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
293 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
294 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
295 | |
296 | /* | |
a051661c TH |
297 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
298 | * is used, root blkg allocates from @q->root_rl and all other | |
299 | * blkgs from their own blkg->rl. Which one to use should be | |
300 | * determined using bio_request_list(). | |
1da177e4 | 301 | */ |
a051661c | 302 | struct request_list root_rl; |
1da177e4 LT |
303 | |
304 | request_fn_proc *request_fn; | |
1da177e4 LT |
305 | make_request_fn *make_request_fn; |
306 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 307 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 308 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 309 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 310 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 311 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 312 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 313 | |
320ae51f JA |
314 | struct blk_mq_ops *mq_ops; |
315 | ||
316 | unsigned int *mq_map; | |
317 | ||
318 | /* sw queues */ | |
e6cdb092 | 319 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
320 | unsigned int nr_queues; |
321 | ||
322 | /* hw dispatch queues */ | |
323 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
324 | unsigned int nr_hw_queues; | |
325 | ||
8922e16c TH |
326 | /* |
327 | * Dispatch queue sorting | |
328 | */ | |
1b47f531 | 329 | sector_t end_sector; |
8922e16c | 330 | struct request *boundary_rq; |
8922e16c | 331 | |
1da177e4 | 332 | /* |
3cca6dc1 | 333 | * Delayed queue handling |
1da177e4 | 334 | */ |
3cca6dc1 | 335 | struct delayed_work delay_work; |
1da177e4 LT |
336 | |
337 | struct backing_dev_info backing_dev_info; | |
338 | ||
339 | /* | |
340 | * The queue owner gets to use this for whatever they like. | |
341 | * ll_rw_blk doesn't touch it. | |
342 | */ | |
343 | void *queuedata; | |
344 | ||
1da177e4 | 345 | /* |
d7b76301 | 346 | * various queue flags, see QUEUE_* below |
1da177e4 | 347 | */ |
d7b76301 | 348 | unsigned long queue_flags; |
1da177e4 | 349 | |
a73f730d TH |
350 | /* |
351 | * ida allocated id for this queue. Used to index queues from | |
352 | * ioctx. | |
353 | */ | |
354 | int id; | |
355 | ||
1da177e4 | 356 | /* |
d7b76301 | 357 | * queue needs bounce pages for pages above this limit |
1da177e4 | 358 | */ |
d7b76301 | 359 | gfp_t bounce_gfp; |
1da177e4 LT |
360 | |
361 | /* | |
152587de | 362 | * protects queue structures from reentrancy. ->__queue_lock should |
363 | * _never_ be used directly, it is queue private. always use | |
364 | * ->queue_lock. | |
1da177e4 | 365 | */ |
152587de | 366 | spinlock_t __queue_lock; |
1da177e4 LT |
367 | spinlock_t *queue_lock; |
368 | ||
369 | /* | |
370 | * queue kobject | |
371 | */ | |
372 | struct kobject kobj; | |
373 | ||
320ae51f JA |
374 | /* |
375 | * mq queue kobject | |
376 | */ | |
377 | struct kobject mq_kobj; | |
378 | ||
47fafbc7 | 379 | #ifdef CONFIG_PM |
6c954667 LM |
380 | struct device *dev; |
381 | int rpm_status; | |
382 | unsigned int nr_pending; | |
383 | #endif | |
384 | ||
1da177e4 LT |
385 | /* |
386 | * queue settings | |
387 | */ | |
388 | unsigned long nr_requests; /* Max # of requests */ | |
389 | unsigned int nr_congestion_on; | |
390 | unsigned int nr_congestion_off; | |
391 | unsigned int nr_batching; | |
392 | ||
fa0ccd83 | 393 | unsigned int dma_drain_size; |
d7b76301 | 394 | void *dma_drain_buffer; |
e3790c7d | 395 | unsigned int dma_pad_mask; |
1da177e4 LT |
396 | unsigned int dma_alignment; |
397 | ||
398 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 399 | struct list_head tag_busy_list; |
1da177e4 | 400 | |
15853af9 | 401 | unsigned int nr_sorted; |
0a7ae2ff | 402 | unsigned int in_flight[2]; |
24faf6f6 BVA |
403 | /* |
404 | * Number of active block driver functions for which blk_drain_queue() | |
405 | * must wait. Must be incremented around functions that unlock the | |
406 | * queue_lock internally, e.g. scsi_request_fn(). | |
407 | */ | |
408 | unsigned int request_fn_active; | |
1da177e4 | 409 | |
242f9dcb JA |
410 | unsigned int rq_timeout; |
411 | struct timer_list timeout; | |
412 | struct list_head timeout_list; | |
413 | ||
a612fddf | 414 | struct list_head icq_list; |
4eef3049 | 415 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 416 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 417 | struct blkcg_gq *root_blkg; |
03aa264a | 418 | struct list_head blkg_list; |
4eef3049 | 419 | #endif |
a612fddf | 420 | |
025146e1 MP |
421 | struct queue_limits limits; |
422 | ||
1da177e4 LT |
423 | /* |
424 | * sg stuff | |
425 | */ | |
426 | unsigned int sg_timeout; | |
427 | unsigned int sg_reserved_size; | |
1946089a | 428 | int node; |
6c5c9341 | 429 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 430 | struct blk_trace *blk_trace; |
6c5c9341 | 431 | #endif |
1da177e4 | 432 | /* |
4913efe4 | 433 | * for flush operations |
1da177e4 | 434 | */ |
4913efe4 | 435 | unsigned int flush_flags; |
f3876930 | 436 | unsigned int flush_not_queueable:1; |
7c94e1c1 | 437 | struct blk_flush_queue *fq; |
483f4afc | 438 | |
6fca6a61 CH |
439 | struct list_head requeue_list; |
440 | spinlock_t requeue_lock; | |
441 | struct work_struct requeue_work; | |
442 | ||
483f4afc | 443 | struct mutex sysfs_lock; |
d351af01 | 444 | |
d732580b | 445 | int bypass_depth; |
4ecd4fef | 446 | atomic_t mq_freeze_depth; |
d732580b | 447 | |
d351af01 | 448 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
449 | bsg_job_fn *bsg_job_fn; |
450 | int bsg_job_size; | |
d351af01 FT |
451 | struct bsg_class_device bsg_dev; |
452 | #endif | |
e43473b7 VG |
453 | |
454 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
455 | /* Throttle data */ | |
456 | struct throtl_data *td; | |
457 | #endif | |
548bc8e1 | 458 | struct rcu_head rcu_head; |
320ae51f | 459 | wait_queue_head_t mq_freeze_wq; |
add703fd | 460 | struct percpu_ref mq_usage_counter; |
320ae51f | 461 | struct list_head all_q_node; |
0d2602ca JA |
462 | |
463 | struct blk_mq_tag_set *tag_set; | |
464 | struct list_head tag_set_list; | |
1da177e4 LT |
465 | }; |
466 | ||
1da177e4 LT |
467 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
468 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
469 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
470 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 471 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 472 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
473 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
474 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 475 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
476 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
477 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
478 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 479 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
480 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
481 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
482 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
483 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
484 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 485 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 486 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 487 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 488 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
66cb45aa | 489 | #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ |
bc58ba94 JA |
490 | |
491 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 492 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
493 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
494 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 495 | |
94eddfbe | 496 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 497 | (1 << QUEUE_FLAG_STACKABLE) | \ |
94eddfbe JA |
498 | (1 << QUEUE_FLAG_SAME_COMP)) |
499 | ||
8bcb6c7d | 500 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 501 | { |
8bcb6c7d AK |
502 | if (q->queue_lock) |
503 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
504 | } |
505 | ||
75ad23bc NP |
506 | static inline void queue_flag_set_unlocked(unsigned int flag, |
507 | struct request_queue *q) | |
508 | { | |
509 | __set_bit(flag, &q->queue_flags); | |
510 | } | |
511 | ||
e48ec690 JA |
512 | static inline int queue_flag_test_and_clear(unsigned int flag, |
513 | struct request_queue *q) | |
514 | { | |
8bcb6c7d | 515 | queue_lockdep_assert_held(q); |
e48ec690 JA |
516 | |
517 | if (test_bit(flag, &q->queue_flags)) { | |
518 | __clear_bit(flag, &q->queue_flags); | |
519 | return 1; | |
520 | } | |
521 | ||
522 | return 0; | |
523 | } | |
524 | ||
525 | static inline int queue_flag_test_and_set(unsigned int flag, | |
526 | struct request_queue *q) | |
527 | { | |
8bcb6c7d | 528 | queue_lockdep_assert_held(q); |
e48ec690 JA |
529 | |
530 | if (!test_bit(flag, &q->queue_flags)) { | |
531 | __set_bit(flag, &q->queue_flags); | |
532 | return 0; | |
533 | } | |
534 | ||
535 | return 1; | |
536 | } | |
537 | ||
75ad23bc NP |
538 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
539 | { | |
8bcb6c7d | 540 | queue_lockdep_assert_held(q); |
75ad23bc NP |
541 | __set_bit(flag, &q->queue_flags); |
542 | } | |
543 | ||
544 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
545 | struct request_queue *q) | |
546 | { | |
547 | __clear_bit(flag, &q->queue_flags); | |
548 | } | |
549 | ||
0a7ae2ff JA |
550 | static inline int queue_in_flight(struct request_queue *q) |
551 | { | |
552 | return q->in_flight[0] + q->in_flight[1]; | |
553 | } | |
554 | ||
75ad23bc NP |
555 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
556 | { | |
8bcb6c7d | 557 | queue_lockdep_assert_held(q); |
75ad23bc NP |
558 | __clear_bit(flag, &q->queue_flags); |
559 | } | |
560 | ||
1da177e4 LT |
561 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
562 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 563 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 564 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 565 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 566 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 567 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
568 | #define blk_queue_noxmerges(q) \ |
569 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 570 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 571 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 572 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
573 | #define blk_queue_stackable(q) \ |
574 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 575 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
576 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
577 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 578 | |
33659ebb CH |
579 | #define blk_noretry_request(rq) \ |
580 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
581 | REQ_FAILFAST_DRIVER)) | |
582 | ||
583 | #define blk_account_rq(rq) \ | |
584 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 585 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 586 | |
ab780f1e | 587 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 588 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
589 | /* rq->queuelist of dequeued request must be list_empty() */ |
590 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
591 | |
592 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
593 | ||
5953316d | 594 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 595 | |
49fd524f JA |
596 | /* |
597 | * Driver can handle struct request, if it either has an old style | |
598 | * request_fn defined, or is blk-mq based. | |
599 | */ | |
600 | static inline bool queue_is_rq_based(struct request_queue *q) | |
601 | { | |
602 | return q->request_fn || q->mq_ops; | |
603 | } | |
604 | ||
e692cb66 MP |
605 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
606 | { | |
607 | return q->limits.cluster; | |
608 | } | |
609 | ||
9e2585a8 | 610 | /* |
1faa16d2 | 611 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 612 | */ |
1faa16d2 JA |
613 | static inline bool rw_is_sync(unsigned int rw_flags) |
614 | { | |
7b6d91da | 615 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
616 | } |
617 | ||
618 | static inline bool rq_is_sync(struct request *rq) | |
619 | { | |
620 | return rw_is_sync(rq->cmd_flags); | |
621 | } | |
622 | ||
5b788ce3 | 623 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 624 | { |
5b788ce3 TH |
625 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
626 | ||
627 | return rl->flags & flag; | |
1da177e4 LT |
628 | } |
629 | ||
5b788ce3 | 630 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 631 | { |
5b788ce3 TH |
632 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
633 | ||
634 | rl->flags |= flag; | |
1da177e4 LT |
635 | } |
636 | ||
5b788ce3 | 637 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 638 | { |
5b788ce3 TH |
639 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
640 | ||
641 | rl->flags &= ~flag; | |
1da177e4 LT |
642 | } |
643 | ||
e2a60da7 MP |
644 | static inline bool rq_mergeable(struct request *rq) |
645 | { | |
646 | if (rq->cmd_type != REQ_TYPE_FS) | |
647 | return false; | |
1da177e4 | 648 | |
e2a60da7 MP |
649 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
650 | return false; | |
651 | ||
652 | return true; | |
653 | } | |
1da177e4 | 654 | |
f31dc1cd MP |
655 | static inline bool blk_check_merge_flags(unsigned int flags1, |
656 | unsigned int flags2) | |
657 | { | |
658 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
659 | return false; | |
660 | ||
661 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
662 | return false; | |
663 | ||
4363ac7c MP |
664 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
665 | return false; | |
666 | ||
f31dc1cd MP |
667 | return true; |
668 | } | |
669 | ||
4363ac7c MP |
670 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
671 | { | |
672 | if (bio_data(a) == bio_data(b)) | |
673 | return true; | |
674 | ||
675 | return false; | |
676 | } | |
677 | ||
1da177e4 LT |
678 | /* |
679 | * q->prep_rq_fn return values | |
680 | */ | |
681 | #define BLKPREP_OK 0 /* serve it */ | |
682 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
683 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
684 | ||
685 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
686 | ||
687 | /* | |
688 | * standard bounce addresses: | |
689 | * | |
690 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
691 | * BLK_BOUNCE_ANY : don't bounce anything | |
692 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
693 | */ | |
2472892a AK |
694 | |
695 | #if BITS_PER_LONG == 32 | |
1da177e4 | 696 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
697 | #else |
698 | #define BLK_BOUNCE_HIGH -1ULL | |
699 | #endif | |
700 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 701 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 702 | |
3d6392cf JA |
703 | /* |
704 | * default timeout for SG_IO if none specified | |
705 | */ | |
706 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 707 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 708 | |
2a7326b5 | 709 | #ifdef CONFIG_BOUNCE |
1da177e4 | 710 | extern int init_emergency_isa_pool(void); |
165125e1 | 711 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
712 | #else |
713 | static inline int init_emergency_isa_pool(void) | |
714 | { | |
715 | return 0; | |
716 | } | |
165125e1 | 717 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
718 | { |
719 | } | |
720 | #endif /* CONFIG_MMU */ | |
721 | ||
152e283f FT |
722 | struct rq_map_data { |
723 | struct page **pages; | |
724 | int page_order; | |
725 | int nr_entries; | |
56c451f4 | 726 | unsigned long offset; |
97ae77a1 | 727 | int null_mapped; |
ecb554a8 | 728 | int from_user; |
152e283f FT |
729 | }; |
730 | ||
5705f702 | 731 | struct req_iterator { |
7988613b | 732 | struct bvec_iter iter; |
5705f702 N |
733 | struct bio *bio; |
734 | }; | |
735 | ||
736 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
737 | #define for_each_bio(_bio) \ |
738 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 739 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
740 | if ((rq->bio)) \ |
741 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
742 | ||
5705f702 N |
743 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
744 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 745 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 746 | |
4550dd6c | 747 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 748 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 749 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 750 | |
2d4dc890 IL |
751 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
752 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
753 | #endif | |
754 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
755 | extern void rq_flush_dcache_pages(struct request *rq); | |
756 | #else | |
757 | static inline void rq_flush_dcache_pages(struct request *rq) | |
758 | { | |
759 | } | |
760 | #endif | |
761 | ||
1da177e4 LT |
762 | extern int blk_register_queue(struct gendisk *disk); |
763 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 764 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 765 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 766 | extern void blk_put_request(struct request *); |
165125e1 | 767 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 768 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
769 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
770 | gfp_t); | |
f27b087b | 771 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 772 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
773 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
774 | unsigned int len); | |
82124d60 | 775 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 776 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
777 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
778 | struct bio_set *bs, gfp_t gfp_mask, | |
779 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
780 | void *data); | |
781 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
782 | extern int blk_insert_cloned_request(struct request_queue *q, |
783 | struct request *rq); | |
3cca6dc1 | 784 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 785 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 786 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
787 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
788 | unsigned int, void __user *); | |
74f3c8af AV |
789 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
790 | unsigned int, void __user *); | |
e915e872 AV |
791 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
792 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 793 | |
165125e1 JA |
794 | extern void blk_start_queue(struct request_queue *q); |
795 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 796 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 797 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 798 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 799 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 800 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 801 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 802 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
803 | struct rq_map_data *, void __user *, unsigned long, |
804 | gfp_t); | |
8e5cfc45 | 805 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
806 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
807 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
808 | struct rq_map_data *, const struct iov_iter *, |
809 | gfp_t); | |
165125e1 | 810 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 811 | struct request *, int); |
165125e1 | 812 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 813 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 814 | |
165125e1 | 815 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 816 | { |
ff9ea323 | 817 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
818 | } |
819 | ||
5efccd17 | 820 | /* |
80a761fd TH |
821 | * blk_rq_pos() : the current sector |
822 | * blk_rq_bytes() : bytes left in the entire request | |
823 | * blk_rq_cur_bytes() : bytes left in the current segment | |
824 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
825 | * blk_rq_sectors() : sectors left in the entire request | |
826 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 827 | */ |
5b93629b TH |
828 | static inline sector_t blk_rq_pos(const struct request *rq) |
829 | { | |
a2dec7b3 | 830 | return rq->__sector; |
2e46e8b2 TH |
831 | } |
832 | ||
833 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
834 | { | |
a2dec7b3 | 835 | return rq->__data_len; |
5b93629b TH |
836 | } |
837 | ||
2e46e8b2 TH |
838 | static inline int blk_rq_cur_bytes(const struct request *rq) |
839 | { | |
840 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
841 | } | |
5efccd17 | 842 | |
80a761fd TH |
843 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
844 | ||
5b93629b TH |
845 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
846 | { | |
2e46e8b2 | 847 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
848 | } |
849 | ||
850 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
851 | { | |
2e46e8b2 | 852 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
853 | } |
854 | ||
f31dc1cd MP |
855 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
856 | unsigned int cmd_flags) | |
857 | { | |
858 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 859 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 860 | |
4363ac7c MP |
861 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
862 | return q->limits.max_write_same_sectors; | |
863 | ||
f31dc1cd MP |
864 | return q->limits.max_sectors; |
865 | } | |
866 | ||
762380ad JA |
867 | /* |
868 | * Return maximum size of a request at given offset. Only valid for | |
869 | * file system requests. | |
870 | */ | |
871 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
872 | sector_t offset) | |
873 | { | |
874 | if (!q->limits.chunk_sectors) | |
736ed4de | 875 | return q->limits.max_sectors; |
762380ad JA |
876 | |
877 | return q->limits.chunk_sectors - | |
878 | (offset & (q->limits.chunk_sectors - 1)); | |
879 | } | |
880 | ||
f31dc1cd MP |
881 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
882 | { | |
883 | struct request_queue *q = rq->q; | |
884 | ||
885 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
886 | return q->limits.max_hw_sectors; | |
887 | ||
e548ca4e | 888 | if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD)) |
762380ad JA |
889 | return blk_queue_get_max_sectors(q, rq->cmd_flags); |
890 | ||
891 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), | |
892 | blk_queue_get_max_sectors(q, rq->cmd_flags)); | |
f31dc1cd MP |
893 | } |
894 | ||
75afb352 JN |
895 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
896 | { | |
897 | unsigned int nr_bios = 0; | |
898 | struct bio *bio; | |
899 | ||
900 | __rq_for_each_bio(bio, rq) | |
901 | nr_bios++; | |
902 | ||
903 | return nr_bios; | |
904 | } | |
905 | ||
9934c8c0 TH |
906 | /* |
907 | * Request issue related functions. | |
908 | */ | |
909 | extern struct request *blk_peek_request(struct request_queue *q); | |
910 | extern void blk_start_request(struct request *rq); | |
911 | extern struct request *blk_fetch_request(struct request_queue *q); | |
912 | ||
1da177e4 | 913 | /* |
2e60e022 TH |
914 | * Request completion related functions. |
915 | * | |
916 | * blk_update_request() completes given number of bytes and updates | |
917 | * the request without completing it. | |
918 | * | |
f06d9a2b TH |
919 | * blk_end_request() and friends. __blk_end_request() must be called |
920 | * with the request queue spinlock acquired. | |
1da177e4 LT |
921 | * |
922 | * Several drivers define their own end_request and call | |
3bcddeac KU |
923 | * blk_end_request() for parts of the original function. |
924 | * This prevents code duplication in drivers. | |
1da177e4 | 925 | */ |
2e60e022 TH |
926 | extern bool blk_update_request(struct request *rq, int error, |
927 | unsigned int nr_bytes); | |
12120077 | 928 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
929 | extern bool blk_end_request(struct request *rq, int error, |
930 | unsigned int nr_bytes); | |
931 | extern void blk_end_request_all(struct request *rq, int error); | |
932 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 933 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
934 | extern bool __blk_end_request(struct request *rq, int error, |
935 | unsigned int nr_bytes); | |
936 | extern void __blk_end_request_all(struct request *rq, int error); | |
937 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 938 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 939 | |
ff856bad | 940 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
941 | extern void __blk_complete_request(struct request *); |
942 | extern void blk_abort_request(struct request *); | |
28018c24 | 943 | extern void blk_unprep_request(struct request *); |
ff856bad | 944 | |
1da177e4 LT |
945 | /* |
946 | * Access functions for manipulating queue properties | |
947 | */ | |
165125e1 | 948 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 949 | spinlock_t *lock, int node_id); |
165125e1 | 950 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
951 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
952 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
953 | extern void blk_cleanup_queue(struct request_queue *); |
954 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
955 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 956 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 957 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 958 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 959 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 960 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
961 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
962 | unsigned int max_discard_sectors); | |
4363ac7c MP |
963 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
964 | unsigned int max_write_same_sectors); | |
e1defc4f | 965 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 966 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
967 | extern void blk_queue_alignment_offset(struct request_queue *q, |
968 | unsigned int alignment); | |
7c958e32 | 969 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 970 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 971 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 972 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 973 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 974 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
975 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
976 | sector_t offset); | |
17be8c24 MP |
977 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
978 | sector_t offset); | |
c72758f3 MP |
979 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
980 | sector_t offset); | |
165125e1 | 981 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 982 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 983 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
984 | extern int blk_queue_dma_drain(struct request_queue *q, |
985 | dma_drain_needed_fn *dma_drain_needed, | |
986 | void *buf, unsigned int size); | |
ef9e3fac | 987 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
988 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
989 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 990 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
991 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
992 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 993 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 994 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
995 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
996 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 997 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 998 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 999 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1000 | |
165125e1 | 1001 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1002 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1003 | extern long nr_blockdev_pages(void); |
1da177e4 | 1004 | |
09ac46c4 | 1005 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1006 | struct request_queue *blk_alloc_queue(gfp_t); |
1007 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1008 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1009 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1010 | |
6c954667 LM |
1011 | /* |
1012 | * block layer runtime pm functions | |
1013 | */ | |
47fafbc7 | 1014 | #ifdef CONFIG_PM |
6c954667 LM |
1015 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1016 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1017 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1018 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1019 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1020 | #else | |
1021 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1022 | struct device *dev) {} | |
1023 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1024 | { | |
1025 | return -ENOSYS; | |
1026 | } | |
1027 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1028 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1029 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1030 | #endif | |
1031 | ||
316cc67d | 1032 | /* |
75df7136 SJ |
1033 | * blk_plug permits building a queue of related requests by holding the I/O |
1034 | * fragments for a short period. This allows merging of sequential requests | |
1035 | * into single larger request. As the requests are moved from a per-task list to | |
1036 | * the device's request_queue in a batch, this results in improved scalability | |
1037 | * as the lock contention for request_queue lock is reduced. | |
1038 | * | |
1039 | * It is ok not to disable preemption when adding the request to the plug list | |
1040 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1041 | * the plug list when the task sleeps by itself. For details, please see | |
1042 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1043 | */ |
73c10101 | 1044 | struct blk_plug { |
75df7136 | 1045 | struct list_head list; /* requests */ |
320ae51f | 1046 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1047 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1048 | }; |
55c022bb SL |
1049 | #define BLK_MAX_REQUEST_COUNT 16 |
1050 | ||
9cbb1750 | 1051 | struct blk_plug_cb; |
74018dc3 | 1052 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1053 | struct blk_plug_cb { |
1054 | struct list_head list; | |
9cbb1750 N |
1055 | blk_plug_cb_fn callback; |
1056 | void *data; | |
048c9374 | 1057 | }; |
9cbb1750 N |
1058 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1059 | void *data, int size); | |
73c10101 JA |
1060 | extern void blk_start_plug(struct blk_plug *); |
1061 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1062 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1063 | |
1064 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1065 | { | |
1066 | struct blk_plug *plug = tsk->plug; | |
1067 | ||
a237c1c5 JA |
1068 | if (plug) |
1069 | blk_flush_plug_list(plug, false); | |
1070 | } | |
1071 | ||
1072 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1073 | { | |
1074 | struct blk_plug *plug = tsk->plug; | |
1075 | ||
88b996cd | 1076 | if (plug) |
f6603783 | 1077 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1078 | } |
1079 | ||
1080 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1081 | { | |
1082 | struct blk_plug *plug = tsk->plug; | |
1083 | ||
320ae51f JA |
1084 | return plug && |
1085 | (!list_empty(&plug->list) || | |
1086 | !list_empty(&plug->mq_list) || | |
1087 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1088 | } |
1089 | ||
1da177e4 LT |
1090 | /* |
1091 | * tag stuff | |
1092 | */ | |
165125e1 JA |
1093 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1094 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1095 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1096 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1097 | extern void blk_queue_free_tags(struct request_queue *); |
1098 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1099 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1100 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1101 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1102 | |
f583f492 DS |
1103 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1104 | int tag) | |
1105 | { | |
1106 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1107 | return NULL; | |
1108 | return bqt->tag_index[tag]; | |
1109 | } | |
dd3932ed CH |
1110 | |
1111 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1112 | ||
1113 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1114 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1115 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1116 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1117 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1118 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1119 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1120 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1121 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1122 | { |
2cf6d26a CH |
1123 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1124 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1125 | gfp_mask, flags); | |
fb2dce86 | 1126 | } |
e6fa0be6 | 1127 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1128 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1129 | { |
1130 | return blkdev_issue_zeroout(sb->s_bdev, | |
1131 | block << (sb->s_blocksize_bits - 9), | |
1132 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1133 | gfp_mask, true); |
e6fa0be6 | 1134 | } |
1da177e4 | 1135 | |
018e0446 | 1136 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1137 | |
eb28d31b MP |
1138 | enum blk_default_limits { |
1139 | BLK_MAX_SEGMENTS = 128, | |
1140 | BLK_SAFE_MAX_SECTORS = 255, | |
eb28d31b MP |
1141 | BLK_MAX_SEGMENT_SIZE = 65536, |
1142 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1143 | }; | |
0e435ac2 | 1144 | |
1da177e4 LT |
1145 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1146 | ||
ae03bf63 MP |
1147 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1148 | { | |
025146e1 | 1149 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1150 | } |
1151 | ||
1152 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1153 | { | |
025146e1 | 1154 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1155 | } |
1156 | ||
1157 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1158 | { | |
025146e1 | 1159 | return q->limits.max_sectors; |
ae03bf63 MP |
1160 | } |
1161 | ||
1162 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1163 | { | |
025146e1 | 1164 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1165 | } |
1166 | ||
8a78362c | 1167 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1168 | { |
8a78362c | 1169 | return q->limits.max_segments; |
ae03bf63 MP |
1170 | } |
1171 | ||
1172 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1173 | { | |
025146e1 | 1174 | return q->limits.max_segment_size; |
ae03bf63 MP |
1175 | } |
1176 | ||
e1defc4f | 1177 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1178 | { |
1179 | int retval = 512; | |
1180 | ||
025146e1 MP |
1181 | if (q && q->limits.logical_block_size) |
1182 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1183 | |
1184 | return retval; | |
1185 | } | |
1186 | ||
e1defc4f | 1187 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1188 | { |
e1defc4f | 1189 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1190 | } |
1191 | ||
c72758f3 MP |
1192 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1193 | { | |
1194 | return q->limits.physical_block_size; | |
1195 | } | |
1196 | ||
892b6f90 | 1197 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1198 | { |
1199 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1200 | } | |
1201 | ||
c72758f3 MP |
1202 | static inline unsigned int queue_io_min(struct request_queue *q) |
1203 | { | |
1204 | return q->limits.io_min; | |
1205 | } | |
1206 | ||
ac481c20 MP |
1207 | static inline int bdev_io_min(struct block_device *bdev) |
1208 | { | |
1209 | return queue_io_min(bdev_get_queue(bdev)); | |
1210 | } | |
1211 | ||
c72758f3 MP |
1212 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1213 | { | |
1214 | return q->limits.io_opt; | |
1215 | } | |
1216 | ||
ac481c20 MP |
1217 | static inline int bdev_io_opt(struct block_device *bdev) |
1218 | { | |
1219 | return queue_io_opt(bdev_get_queue(bdev)); | |
1220 | } | |
1221 | ||
c72758f3 MP |
1222 | static inline int queue_alignment_offset(struct request_queue *q) |
1223 | { | |
ac481c20 | 1224 | if (q->limits.misaligned) |
c72758f3 MP |
1225 | return -1; |
1226 | ||
ac481c20 | 1227 | return q->limits.alignment_offset; |
c72758f3 MP |
1228 | } |
1229 | ||
e03a72e1 | 1230 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1231 | { |
1232 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1233 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1234 | |
b8839b8c | 1235 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1236 | } |
1237 | ||
ac481c20 MP |
1238 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1239 | { | |
1240 | struct request_queue *q = bdev_get_queue(bdev); | |
1241 | ||
1242 | if (q->limits.misaligned) | |
1243 | return -1; | |
1244 | ||
1245 | if (bdev != bdev->bd_contains) | |
1246 | return bdev->bd_part->alignment_offset; | |
1247 | ||
1248 | return q->limits.alignment_offset; | |
1249 | } | |
1250 | ||
86b37281 MP |
1251 | static inline int queue_discard_alignment(struct request_queue *q) |
1252 | { | |
1253 | if (q->limits.discard_misaligned) | |
1254 | return -1; | |
1255 | ||
1256 | return q->limits.discard_alignment; | |
1257 | } | |
1258 | ||
e03a72e1 | 1259 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1260 | { |
59771079 | 1261 | unsigned int alignment, granularity, offset; |
dd3d145d | 1262 | |
a934a00a MP |
1263 | if (!lim->max_discard_sectors) |
1264 | return 0; | |
1265 | ||
59771079 LT |
1266 | /* Why are these in bytes, not sectors? */ |
1267 | alignment = lim->discard_alignment >> 9; | |
1268 | granularity = lim->discard_granularity >> 9; | |
1269 | if (!granularity) | |
1270 | return 0; | |
1271 | ||
1272 | /* Offset of the partition start in 'granularity' sectors */ | |
1273 | offset = sector_div(sector, granularity); | |
1274 | ||
1275 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1276 | offset = (granularity + alignment - offset) % granularity; | |
1277 | ||
1278 | /* Turn it back into bytes, gaah */ | |
1279 | return offset << 9; | |
86b37281 MP |
1280 | } |
1281 | ||
c6e66634 PB |
1282 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1283 | { | |
1284 | struct request_queue *q = bdev_get_queue(bdev); | |
1285 | ||
1286 | if (bdev != bdev->bd_contains) | |
1287 | return bdev->bd_part->discard_alignment; | |
1288 | ||
1289 | return q->limits.discard_alignment; | |
1290 | } | |
1291 | ||
98262f27 MP |
1292 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1293 | { | |
a934a00a | 1294 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1295 | return 1; |
1296 | ||
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1301 | { | |
1302 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1303 | } | |
1304 | ||
4363ac7c MP |
1305 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1306 | { | |
1307 | struct request_queue *q = bdev_get_queue(bdev); | |
1308 | ||
1309 | if (q) | |
1310 | return q->limits.max_write_same_sectors; | |
1311 | ||
1312 | return 0; | |
1313 | } | |
1314 | ||
165125e1 | 1315 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1316 | { |
482eb689 | 1317 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1318 | } |
1319 | ||
14417799 | 1320 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1321 | unsigned int len) |
1322 | { | |
1323 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1324 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1325 | } |
1326 | ||
1da177e4 LT |
1327 | /* assumes size > 256 */ |
1328 | static inline unsigned int blksize_bits(unsigned int size) | |
1329 | { | |
1330 | unsigned int bits = 8; | |
1331 | do { | |
1332 | bits++; | |
1333 | size >>= 1; | |
1334 | } while (size > 256); | |
1335 | return bits; | |
1336 | } | |
1337 | ||
2befb9e3 | 1338 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1339 | { |
1340 | return bdev->bd_block_size; | |
1341 | } | |
1342 | ||
f3876930 | 1343 | static inline bool queue_flush_queueable(struct request_queue *q) |
1344 | { | |
1345 | return !q->flush_not_queueable; | |
1346 | } | |
1347 | ||
1da177e4 LT |
1348 | typedef struct {struct page *v;} Sector; |
1349 | ||
1350 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1351 | ||
1352 | static inline void put_dev_sector(Sector p) | |
1353 | { | |
1354 | page_cache_release(p.v); | |
1355 | } | |
1356 | ||
1357 | struct work_struct; | |
59c3d45e JA |
1358 | int kblockd_schedule_work(struct work_struct *work); |
1359 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1360 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1361 | |
9195291e | 1362 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1363 | /* |
1364 | * This should not be using sched_clock(). A real patch is in progress | |
1365 | * to fix this up, until that is in place we need to disable preemption | |
1366 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1367 | */ | |
9195291e DS |
1368 | static inline void set_start_time_ns(struct request *req) |
1369 | { | |
28f4197e | 1370 | preempt_disable(); |
9195291e | 1371 | req->start_time_ns = sched_clock(); |
28f4197e | 1372 | preempt_enable(); |
9195291e DS |
1373 | } |
1374 | ||
1375 | static inline void set_io_start_time_ns(struct request *req) | |
1376 | { | |
28f4197e | 1377 | preempt_disable(); |
9195291e | 1378 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1379 | preempt_enable(); |
9195291e | 1380 | } |
84c124da DS |
1381 | |
1382 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1383 | { | |
1384 | return req->start_time_ns; | |
1385 | } | |
1386 | ||
1387 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1388 | { | |
1389 | return req->io_start_time_ns; | |
1390 | } | |
9195291e DS |
1391 | #else |
1392 | static inline void set_start_time_ns(struct request *req) {} | |
1393 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1394 | static inline uint64_t rq_start_time_ns(struct request *req) |
1395 | { | |
1396 | return 0; | |
1397 | } | |
1398 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1399 | { | |
1400 | return 0; | |
1401 | } | |
9195291e DS |
1402 | #endif |
1403 | ||
1da177e4 LT |
1404 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1405 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1406 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1407 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1408 | ||
7ba1ba12 MP |
1409 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1410 | ||
8288f496 MP |
1411 | enum blk_integrity_flags { |
1412 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1413 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1414 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1415 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1416 | }; |
7ba1ba12 | 1417 | |
18593088 | 1418 | struct blk_integrity_iter { |
7ba1ba12 MP |
1419 | void *prot_buf; |
1420 | void *data_buf; | |
3be91c4a | 1421 | sector_t seed; |
7ba1ba12 | 1422 | unsigned int data_size; |
3be91c4a | 1423 | unsigned short interval; |
7ba1ba12 MP |
1424 | const char *disk_name; |
1425 | }; | |
1426 | ||
18593088 | 1427 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 MP |
1428 | |
1429 | struct blk_integrity { | |
18593088 MP |
1430 | integrity_processing_fn *generate_fn; |
1431 | integrity_processing_fn *verify_fn; | |
7ba1ba12 MP |
1432 | |
1433 | unsigned short flags; | |
1434 | unsigned short tuple_size; | |
3be91c4a | 1435 | unsigned short interval; |
7ba1ba12 MP |
1436 | unsigned short tag_size; |
1437 | ||
1438 | const char *name; | |
1439 | ||
1440 | struct kobject kobj; | |
1441 | }; | |
1442 | ||
a63a5cf8 | 1443 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1444 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1445 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1446 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1447 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1448 | struct scatterlist *); | |
1449 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1450 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1451 | struct request *); | |
1452 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1453 | struct bio *); | |
7ba1ba12 | 1454 | |
b04accc4 JA |
1455 | static inline |
1456 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1457 | { | |
1458 | return bdev->bd_disk->integrity; | |
1459 | } | |
1460 | ||
b02739b0 MP |
1461 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1462 | { | |
1463 | return disk->integrity; | |
1464 | } | |
1465 | ||
180b2f95 | 1466 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1467 | { |
180b2f95 | 1468 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1469 | } |
1470 | ||
13f05c8d MP |
1471 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1472 | unsigned int segs) | |
1473 | { | |
1474 | q->limits.max_integrity_segments = segs; | |
1475 | } | |
1476 | ||
1477 | static inline unsigned short | |
1478 | queue_max_integrity_segments(struct request_queue *q) | |
1479 | { | |
1480 | return q->limits.max_integrity_segments; | |
1481 | } | |
1482 | ||
7ba1ba12 MP |
1483 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1484 | ||
fd83240a SR |
1485 | struct bio; |
1486 | struct block_device; | |
1487 | struct gendisk; | |
1488 | struct blk_integrity; | |
1489 | ||
1490 | static inline int blk_integrity_rq(struct request *rq) | |
1491 | { | |
1492 | return 0; | |
1493 | } | |
1494 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1495 | struct bio *b) | |
1496 | { | |
1497 | return 0; | |
1498 | } | |
1499 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1500 | struct bio *b, | |
1501 | struct scatterlist *s) | |
1502 | { | |
1503 | return 0; | |
1504 | } | |
1505 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1506 | { | |
61a04e5b | 1507 | return NULL; |
fd83240a SR |
1508 | } |
1509 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1510 | { | |
1511 | return NULL; | |
1512 | } | |
1513 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1514 | { | |
1515 | return 0; | |
1516 | } | |
1517 | static inline int blk_integrity_register(struct gendisk *d, | |
1518 | struct blk_integrity *b) | |
1519 | { | |
1520 | return 0; | |
1521 | } | |
1522 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1523 | { | |
1524 | } | |
1525 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1526 | unsigned int segs) | |
1527 | { | |
1528 | } | |
1529 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1530 | { | |
1531 | return 0; | |
1532 | } | |
4eaf99be MP |
1533 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1534 | struct request *r1, | |
1535 | struct request *r2) | |
fd83240a | 1536 | { |
cb1a5ab6 | 1537 | return true; |
fd83240a | 1538 | } |
4eaf99be MP |
1539 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1540 | struct request *r, | |
1541 | struct bio *b) | |
fd83240a | 1542 | { |
cb1a5ab6 | 1543 | return true; |
fd83240a SR |
1544 | } |
1545 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1546 | { | |
1547 | return 0; | |
1548 | } | |
7ba1ba12 MP |
1549 | |
1550 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1551 | ||
08f85851 | 1552 | struct block_device_operations { |
d4430d62 | 1553 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1554 | void (*release) (struct gendisk *, fmode_t); |
47a191fd | 1555 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
d4430d62 AV |
1556 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1557 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
dd22f551 MW |
1558 | long (*direct_access)(struct block_device *, sector_t, |
1559 | void **, unsigned long *pfn, long size); | |
77ea887e TH |
1560 | unsigned int (*check_events) (struct gendisk *disk, |
1561 | unsigned int clearing); | |
1562 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1563 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1564 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1565 | int (*revalidate_disk) (struct gendisk *); |
1566 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1567 | /* this callback is with swap_lock and sometimes page table lock held */ |
1568 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1569 | struct module *owner; |
1570 | }; | |
1571 | ||
633a08b8 AV |
1572 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1573 | unsigned long); | |
47a191fd MW |
1574 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1575 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1576 | struct writeback_control *); | |
dd22f551 MW |
1577 | extern long bdev_direct_access(struct block_device *, sector_t, void **addr, |
1578 | unsigned long *pfn, long size); | |
9361401e | 1579 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1580 | |
1581 | struct block_device; | |
1582 | ||
9361401e DH |
1583 | /* |
1584 | * stubs for when the block layer is configured out | |
1585 | */ | |
1586 | #define buffer_heads_over_limit 0 | |
1587 | ||
9361401e DH |
1588 | static inline long nr_blockdev_pages(void) |
1589 | { | |
1590 | return 0; | |
1591 | } | |
1592 | ||
1f940bdf JA |
1593 | struct blk_plug { |
1594 | }; | |
1595 | ||
1596 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1597 | { |
1598 | } | |
1599 | ||
1f940bdf | 1600 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1601 | { |
1602 | } | |
1603 | ||
1f940bdf | 1604 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1605 | { |
1606 | } | |
1607 | ||
a237c1c5 JA |
1608 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1609 | { | |
1610 | } | |
1611 | ||
1612 | ||
73c10101 JA |
1613 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1614 | { | |
1615 | return false; | |
1616 | } | |
1617 | ||
ac13a829 FF |
1618 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1619 | sector_t *error_sector) | |
1620 | { | |
1621 | return 0; | |
1622 | } | |
1623 | ||
9361401e DH |
1624 | #endif /* CONFIG_BLOCK */ |
1625 | ||
1da177e4 | 1626 | #endif |