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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; |
0034af03 | 271 | unsigned int max_hw_discard_sectors; |
4363ac7c | 272 | unsigned int max_write_same_sectors; |
86b37281 MP |
273 | unsigned int discard_granularity; |
274 | unsigned int discard_alignment; | |
025146e1 MP |
275 | |
276 | unsigned short logical_block_size; | |
8a78362c | 277 | unsigned short max_segments; |
13f05c8d | 278 | unsigned short max_integrity_segments; |
025146e1 | 279 | |
c72758f3 | 280 | unsigned char misaligned; |
86b37281 | 281 | unsigned char discard_misaligned; |
e692cb66 | 282 | unsigned char cluster; |
a934a00a | 283 | unsigned char discard_zeroes_data; |
c78afc62 | 284 | unsigned char raid_partial_stripes_expensive; |
025146e1 MP |
285 | }; |
286 | ||
d7b76301 | 287 | struct request_queue { |
1da177e4 LT |
288 | /* |
289 | * Together with queue_head for cacheline sharing | |
290 | */ | |
291 | struct list_head queue_head; | |
292 | struct request *last_merge; | |
b374d18a | 293 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
294 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
295 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
296 | |
297 | /* | |
a051661c TH |
298 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
299 | * is used, root blkg allocates from @q->root_rl and all other | |
300 | * blkgs from their own blkg->rl. Which one to use should be | |
301 | * determined using bio_request_list(). | |
1da177e4 | 302 | */ |
a051661c | 303 | struct request_list root_rl; |
1da177e4 LT |
304 | |
305 | request_fn_proc *request_fn; | |
1da177e4 LT |
306 | make_request_fn *make_request_fn; |
307 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 308 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 309 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 310 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 311 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 312 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 313 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 314 | |
320ae51f JA |
315 | struct blk_mq_ops *mq_ops; |
316 | ||
317 | unsigned int *mq_map; | |
318 | ||
319 | /* sw queues */ | |
e6cdb092 | 320 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
321 | unsigned int nr_queues; |
322 | ||
323 | /* hw dispatch queues */ | |
324 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
325 | unsigned int nr_hw_queues; | |
326 | ||
8922e16c TH |
327 | /* |
328 | * Dispatch queue sorting | |
329 | */ | |
1b47f531 | 330 | sector_t end_sector; |
8922e16c | 331 | struct request *boundary_rq; |
8922e16c | 332 | |
1da177e4 | 333 | /* |
3cca6dc1 | 334 | * Delayed queue handling |
1da177e4 | 335 | */ |
3cca6dc1 | 336 | struct delayed_work delay_work; |
1da177e4 LT |
337 | |
338 | struct backing_dev_info backing_dev_info; | |
339 | ||
340 | /* | |
341 | * The queue owner gets to use this for whatever they like. | |
342 | * ll_rw_blk doesn't touch it. | |
343 | */ | |
344 | void *queuedata; | |
345 | ||
1da177e4 | 346 | /* |
d7b76301 | 347 | * various queue flags, see QUEUE_* below |
1da177e4 | 348 | */ |
d7b76301 | 349 | unsigned long queue_flags; |
1da177e4 | 350 | |
a73f730d TH |
351 | /* |
352 | * ida allocated id for this queue. Used to index queues from | |
353 | * ioctx. | |
354 | */ | |
355 | int id; | |
356 | ||
1da177e4 | 357 | /* |
d7b76301 | 358 | * queue needs bounce pages for pages above this limit |
1da177e4 | 359 | */ |
d7b76301 | 360 | gfp_t bounce_gfp; |
1da177e4 LT |
361 | |
362 | /* | |
152587de | 363 | * protects queue structures from reentrancy. ->__queue_lock should |
364 | * _never_ be used directly, it is queue private. always use | |
365 | * ->queue_lock. | |
1da177e4 | 366 | */ |
152587de | 367 | spinlock_t __queue_lock; |
1da177e4 LT |
368 | spinlock_t *queue_lock; |
369 | ||
370 | /* | |
371 | * queue kobject | |
372 | */ | |
373 | struct kobject kobj; | |
374 | ||
320ae51f JA |
375 | /* |
376 | * mq queue kobject | |
377 | */ | |
378 | struct kobject mq_kobj; | |
379 | ||
47fafbc7 | 380 | #ifdef CONFIG_PM |
6c954667 LM |
381 | struct device *dev; |
382 | int rpm_status; | |
383 | unsigned int nr_pending; | |
384 | #endif | |
385 | ||
1da177e4 LT |
386 | /* |
387 | * queue settings | |
388 | */ | |
389 | unsigned long nr_requests; /* Max # of requests */ | |
390 | unsigned int nr_congestion_on; | |
391 | unsigned int nr_congestion_off; | |
392 | unsigned int nr_batching; | |
393 | ||
fa0ccd83 | 394 | unsigned int dma_drain_size; |
d7b76301 | 395 | void *dma_drain_buffer; |
e3790c7d | 396 | unsigned int dma_pad_mask; |
1da177e4 LT |
397 | unsigned int dma_alignment; |
398 | ||
399 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 400 | struct list_head tag_busy_list; |
1da177e4 | 401 | |
15853af9 | 402 | unsigned int nr_sorted; |
0a7ae2ff | 403 | unsigned int in_flight[2]; |
24faf6f6 BVA |
404 | /* |
405 | * Number of active block driver functions for which blk_drain_queue() | |
406 | * must wait. Must be incremented around functions that unlock the | |
407 | * queue_lock internally, e.g. scsi_request_fn(). | |
408 | */ | |
409 | unsigned int request_fn_active; | |
1da177e4 | 410 | |
242f9dcb JA |
411 | unsigned int rq_timeout; |
412 | struct timer_list timeout; | |
413 | struct list_head timeout_list; | |
414 | ||
a612fddf | 415 | struct list_head icq_list; |
4eef3049 | 416 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 417 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 418 | struct blkcg_gq *root_blkg; |
03aa264a | 419 | struct list_head blkg_list; |
4eef3049 | 420 | #endif |
a612fddf | 421 | |
025146e1 MP |
422 | struct queue_limits limits; |
423 | ||
1da177e4 LT |
424 | /* |
425 | * sg stuff | |
426 | */ | |
427 | unsigned int sg_timeout; | |
428 | unsigned int sg_reserved_size; | |
1946089a | 429 | int node; |
6c5c9341 | 430 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 431 | struct blk_trace *blk_trace; |
6c5c9341 | 432 | #endif |
1da177e4 | 433 | /* |
4913efe4 | 434 | * for flush operations |
1da177e4 | 435 | */ |
4913efe4 | 436 | unsigned int flush_flags; |
f3876930 | 437 | unsigned int flush_not_queueable:1; |
7c94e1c1 | 438 | struct blk_flush_queue *fq; |
483f4afc | 439 | |
6fca6a61 CH |
440 | struct list_head requeue_list; |
441 | spinlock_t requeue_lock; | |
442 | struct work_struct requeue_work; | |
443 | ||
483f4afc | 444 | struct mutex sysfs_lock; |
d351af01 | 445 | |
d732580b | 446 | int bypass_depth; |
4ecd4fef | 447 | atomic_t mq_freeze_depth; |
d732580b | 448 | |
d351af01 | 449 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
450 | bsg_job_fn *bsg_job_fn; |
451 | int bsg_job_size; | |
d351af01 FT |
452 | struct bsg_class_device bsg_dev; |
453 | #endif | |
e43473b7 VG |
454 | |
455 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
456 | /* Throttle data */ | |
457 | struct throtl_data *td; | |
458 | #endif | |
548bc8e1 | 459 | struct rcu_head rcu_head; |
320ae51f | 460 | wait_queue_head_t mq_freeze_wq; |
add703fd | 461 | struct percpu_ref mq_usage_counter; |
320ae51f | 462 | struct list_head all_q_node; |
0d2602ca JA |
463 | |
464 | struct blk_mq_tag_set *tag_set; | |
465 | struct list_head tag_set_list; | |
1da177e4 LT |
466 | }; |
467 | ||
1da177e4 LT |
468 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
469 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
470 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
471 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 472 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 473 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
474 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
475 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 476 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
477 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
478 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
479 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 480 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
481 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
482 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
483 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
484 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
485 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 486 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 487 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 488 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 489 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
66cb45aa | 490 | #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ |
bc58ba94 JA |
491 | |
492 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 493 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
494 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
495 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 496 | |
94eddfbe | 497 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 498 | (1 << QUEUE_FLAG_STACKABLE) | \ |
94eddfbe JA |
499 | (1 << QUEUE_FLAG_SAME_COMP)) |
500 | ||
8bcb6c7d | 501 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 502 | { |
8bcb6c7d AK |
503 | if (q->queue_lock) |
504 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
505 | } |
506 | ||
75ad23bc NP |
507 | static inline void queue_flag_set_unlocked(unsigned int flag, |
508 | struct request_queue *q) | |
509 | { | |
510 | __set_bit(flag, &q->queue_flags); | |
511 | } | |
512 | ||
e48ec690 JA |
513 | static inline int queue_flag_test_and_clear(unsigned int flag, |
514 | struct request_queue *q) | |
515 | { | |
8bcb6c7d | 516 | queue_lockdep_assert_held(q); |
e48ec690 JA |
517 | |
518 | if (test_bit(flag, &q->queue_flags)) { | |
519 | __clear_bit(flag, &q->queue_flags); | |
520 | return 1; | |
521 | } | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | static inline int queue_flag_test_and_set(unsigned int flag, | |
527 | struct request_queue *q) | |
528 | { | |
8bcb6c7d | 529 | queue_lockdep_assert_held(q); |
e48ec690 JA |
530 | |
531 | if (!test_bit(flag, &q->queue_flags)) { | |
532 | __set_bit(flag, &q->queue_flags); | |
533 | return 0; | |
534 | } | |
535 | ||
536 | return 1; | |
537 | } | |
538 | ||
75ad23bc NP |
539 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
540 | { | |
8bcb6c7d | 541 | queue_lockdep_assert_held(q); |
75ad23bc NP |
542 | __set_bit(flag, &q->queue_flags); |
543 | } | |
544 | ||
545 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
546 | struct request_queue *q) | |
547 | { | |
548 | __clear_bit(flag, &q->queue_flags); | |
549 | } | |
550 | ||
0a7ae2ff JA |
551 | static inline int queue_in_flight(struct request_queue *q) |
552 | { | |
553 | return q->in_flight[0] + q->in_flight[1]; | |
554 | } | |
555 | ||
75ad23bc NP |
556 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
557 | { | |
8bcb6c7d | 558 | queue_lockdep_assert_held(q); |
75ad23bc NP |
559 | __clear_bit(flag, &q->queue_flags); |
560 | } | |
561 | ||
1da177e4 LT |
562 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
563 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 564 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 565 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 566 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 567 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 568 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
569 | #define blk_queue_noxmerges(q) \ |
570 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 571 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 572 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 573 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
574 | #define blk_queue_stackable(q) \ |
575 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 576 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
577 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
578 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 579 | |
33659ebb CH |
580 | #define blk_noretry_request(rq) \ |
581 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
582 | REQ_FAILFAST_DRIVER)) | |
583 | ||
584 | #define blk_account_rq(rq) \ | |
585 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 586 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 587 | |
ab780f1e | 588 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 589 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
590 | /* rq->queuelist of dequeued request must be list_empty() */ |
591 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
592 | |
593 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
594 | ||
5953316d | 595 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 596 | |
49fd524f JA |
597 | /* |
598 | * Driver can handle struct request, if it either has an old style | |
599 | * request_fn defined, or is blk-mq based. | |
600 | */ | |
601 | static inline bool queue_is_rq_based(struct request_queue *q) | |
602 | { | |
603 | return q->request_fn || q->mq_ops; | |
604 | } | |
605 | ||
e692cb66 MP |
606 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
607 | { | |
608 | return q->limits.cluster; | |
609 | } | |
610 | ||
9e2585a8 | 611 | /* |
1faa16d2 | 612 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 613 | */ |
1faa16d2 JA |
614 | static inline bool rw_is_sync(unsigned int rw_flags) |
615 | { | |
7b6d91da | 616 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
617 | } |
618 | ||
619 | static inline bool rq_is_sync(struct request *rq) | |
620 | { | |
621 | return rw_is_sync(rq->cmd_flags); | |
622 | } | |
623 | ||
5b788ce3 | 624 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 625 | { |
5b788ce3 TH |
626 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
627 | ||
628 | return rl->flags & flag; | |
1da177e4 LT |
629 | } |
630 | ||
5b788ce3 | 631 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 632 | { |
5b788ce3 TH |
633 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
634 | ||
635 | rl->flags |= flag; | |
1da177e4 LT |
636 | } |
637 | ||
5b788ce3 | 638 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 639 | { |
5b788ce3 TH |
640 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
641 | ||
642 | rl->flags &= ~flag; | |
1da177e4 LT |
643 | } |
644 | ||
e2a60da7 MP |
645 | static inline bool rq_mergeable(struct request *rq) |
646 | { | |
647 | if (rq->cmd_type != REQ_TYPE_FS) | |
648 | return false; | |
1da177e4 | 649 | |
e2a60da7 MP |
650 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
651 | return false; | |
652 | ||
653 | return true; | |
654 | } | |
1da177e4 | 655 | |
f31dc1cd MP |
656 | static inline bool blk_check_merge_flags(unsigned int flags1, |
657 | unsigned int flags2) | |
658 | { | |
659 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
660 | return false; | |
661 | ||
662 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
663 | return false; | |
664 | ||
4363ac7c MP |
665 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
666 | return false; | |
667 | ||
f31dc1cd MP |
668 | return true; |
669 | } | |
670 | ||
4363ac7c MP |
671 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
672 | { | |
673 | if (bio_data(a) == bio_data(b)) | |
674 | return true; | |
675 | ||
676 | return false; | |
677 | } | |
678 | ||
1da177e4 LT |
679 | /* |
680 | * q->prep_rq_fn return values | |
681 | */ | |
682 | #define BLKPREP_OK 0 /* serve it */ | |
683 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
684 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
685 | ||
686 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
687 | ||
688 | /* | |
689 | * standard bounce addresses: | |
690 | * | |
691 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
692 | * BLK_BOUNCE_ANY : don't bounce anything | |
693 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
694 | */ | |
2472892a AK |
695 | |
696 | #if BITS_PER_LONG == 32 | |
1da177e4 | 697 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
698 | #else |
699 | #define BLK_BOUNCE_HIGH -1ULL | |
700 | #endif | |
701 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 702 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 703 | |
3d6392cf JA |
704 | /* |
705 | * default timeout for SG_IO if none specified | |
706 | */ | |
707 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 708 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 709 | |
2a7326b5 | 710 | #ifdef CONFIG_BOUNCE |
1da177e4 | 711 | extern int init_emergency_isa_pool(void); |
165125e1 | 712 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
713 | #else |
714 | static inline int init_emergency_isa_pool(void) | |
715 | { | |
716 | return 0; | |
717 | } | |
165125e1 | 718 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
719 | { |
720 | } | |
721 | #endif /* CONFIG_MMU */ | |
722 | ||
152e283f FT |
723 | struct rq_map_data { |
724 | struct page **pages; | |
725 | int page_order; | |
726 | int nr_entries; | |
56c451f4 | 727 | unsigned long offset; |
97ae77a1 | 728 | int null_mapped; |
ecb554a8 | 729 | int from_user; |
152e283f FT |
730 | }; |
731 | ||
5705f702 | 732 | struct req_iterator { |
7988613b | 733 | struct bvec_iter iter; |
5705f702 N |
734 | struct bio *bio; |
735 | }; | |
736 | ||
737 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
738 | #define for_each_bio(_bio) \ |
739 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 740 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
741 | if ((rq->bio)) \ |
742 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
743 | ||
5705f702 N |
744 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
745 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 746 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 747 | |
4550dd6c | 748 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 749 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 750 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 751 | |
2d4dc890 IL |
752 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
753 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
754 | #endif | |
755 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
756 | extern void rq_flush_dcache_pages(struct request *rq); | |
757 | #else | |
758 | static inline void rq_flush_dcache_pages(struct request *rq) | |
759 | { | |
760 | } | |
761 | #endif | |
762 | ||
1da177e4 LT |
763 | extern int blk_register_queue(struct gendisk *disk); |
764 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 765 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 766 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 767 | extern void blk_put_request(struct request *); |
165125e1 | 768 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 769 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
770 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
771 | gfp_t); | |
f27b087b | 772 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 773 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
774 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
775 | unsigned int len); | |
82124d60 | 776 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 777 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
778 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
779 | struct bio_set *bs, gfp_t gfp_mask, | |
780 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
781 | void *data); | |
782 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
783 | extern int blk_insert_cloned_request(struct request_queue *q, |
784 | struct request *rq); | |
3cca6dc1 | 785 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 786 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 787 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
788 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
789 | unsigned int, void __user *); | |
74f3c8af AV |
790 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
791 | unsigned int, void __user *); | |
e915e872 AV |
792 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
793 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 794 | |
165125e1 JA |
795 | extern void blk_start_queue(struct request_queue *q); |
796 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 797 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 798 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 799 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 800 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 801 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 802 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 803 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
804 | struct rq_map_data *, void __user *, unsigned long, |
805 | gfp_t); | |
8e5cfc45 | 806 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
807 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
808 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
809 | struct rq_map_data *, const struct iov_iter *, |
810 | gfp_t); | |
165125e1 | 811 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 812 | struct request *, int); |
165125e1 | 813 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 814 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 815 | |
165125e1 | 816 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 817 | { |
ff9ea323 | 818 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
819 | } |
820 | ||
5efccd17 | 821 | /* |
80a761fd TH |
822 | * blk_rq_pos() : the current sector |
823 | * blk_rq_bytes() : bytes left in the entire request | |
824 | * blk_rq_cur_bytes() : bytes left in the current segment | |
825 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
826 | * blk_rq_sectors() : sectors left in the entire request | |
827 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 828 | */ |
5b93629b TH |
829 | static inline sector_t blk_rq_pos(const struct request *rq) |
830 | { | |
a2dec7b3 | 831 | return rq->__sector; |
2e46e8b2 TH |
832 | } |
833 | ||
834 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
835 | { | |
a2dec7b3 | 836 | return rq->__data_len; |
5b93629b TH |
837 | } |
838 | ||
2e46e8b2 TH |
839 | static inline int blk_rq_cur_bytes(const struct request *rq) |
840 | { | |
841 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
842 | } | |
5efccd17 | 843 | |
80a761fd TH |
844 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
845 | ||
5b93629b TH |
846 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
847 | { | |
2e46e8b2 | 848 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
849 | } |
850 | ||
851 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
852 | { | |
2e46e8b2 | 853 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
854 | } |
855 | ||
f31dc1cd MP |
856 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
857 | unsigned int cmd_flags) | |
858 | { | |
859 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 860 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 861 | |
4363ac7c MP |
862 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
863 | return q->limits.max_write_same_sectors; | |
864 | ||
f31dc1cd MP |
865 | return q->limits.max_sectors; |
866 | } | |
867 | ||
762380ad JA |
868 | /* |
869 | * Return maximum size of a request at given offset. Only valid for | |
870 | * file system requests. | |
871 | */ | |
872 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
873 | sector_t offset) | |
874 | { | |
875 | if (!q->limits.chunk_sectors) | |
736ed4de | 876 | return q->limits.max_sectors; |
762380ad JA |
877 | |
878 | return q->limits.chunk_sectors - | |
879 | (offset & (q->limits.chunk_sectors - 1)); | |
880 | } | |
881 | ||
f31dc1cd MP |
882 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
883 | { | |
884 | struct request_queue *q = rq->q; | |
885 | ||
886 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
887 | return q->limits.max_hw_sectors; | |
888 | ||
e548ca4e | 889 | if (!q->limits.chunk_sectors || (rq->cmd_flags & REQ_DISCARD)) |
762380ad JA |
890 | return blk_queue_get_max_sectors(q, rq->cmd_flags); |
891 | ||
892 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), | |
893 | blk_queue_get_max_sectors(q, rq->cmd_flags)); | |
f31dc1cd MP |
894 | } |
895 | ||
75afb352 JN |
896 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
897 | { | |
898 | unsigned int nr_bios = 0; | |
899 | struct bio *bio; | |
900 | ||
901 | __rq_for_each_bio(bio, rq) | |
902 | nr_bios++; | |
903 | ||
904 | return nr_bios; | |
905 | } | |
906 | ||
9934c8c0 TH |
907 | /* |
908 | * Request issue related functions. | |
909 | */ | |
910 | extern struct request *blk_peek_request(struct request_queue *q); | |
911 | extern void blk_start_request(struct request *rq); | |
912 | extern struct request *blk_fetch_request(struct request_queue *q); | |
913 | ||
1da177e4 | 914 | /* |
2e60e022 TH |
915 | * Request completion related functions. |
916 | * | |
917 | * blk_update_request() completes given number of bytes and updates | |
918 | * the request without completing it. | |
919 | * | |
f06d9a2b TH |
920 | * blk_end_request() and friends. __blk_end_request() must be called |
921 | * with the request queue spinlock acquired. | |
1da177e4 LT |
922 | * |
923 | * Several drivers define their own end_request and call | |
3bcddeac KU |
924 | * blk_end_request() for parts of the original function. |
925 | * This prevents code duplication in drivers. | |
1da177e4 | 926 | */ |
2e60e022 TH |
927 | extern bool blk_update_request(struct request *rq, int error, |
928 | unsigned int nr_bytes); | |
12120077 | 929 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
930 | extern bool blk_end_request(struct request *rq, int error, |
931 | unsigned int nr_bytes); | |
932 | extern void blk_end_request_all(struct request *rq, int error); | |
933 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 934 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
935 | extern bool __blk_end_request(struct request *rq, int error, |
936 | unsigned int nr_bytes); | |
937 | extern void __blk_end_request_all(struct request *rq, int error); | |
938 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 939 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 940 | |
ff856bad | 941 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
942 | extern void __blk_complete_request(struct request *); |
943 | extern void blk_abort_request(struct request *); | |
28018c24 | 944 | extern void blk_unprep_request(struct request *); |
ff856bad | 945 | |
1da177e4 LT |
946 | /* |
947 | * Access functions for manipulating queue properties | |
948 | */ | |
165125e1 | 949 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 950 | spinlock_t *lock, int node_id); |
165125e1 | 951 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
952 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
953 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
954 | extern void blk_cleanup_queue(struct request_queue *); |
955 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
956 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 957 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 958 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 959 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 960 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 961 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
962 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
963 | unsigned int max_discard_sectors); | |
4363ac7c MP |
964 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
965 | unsigned int max_write_same_sectors); | |
e1defc4f | 966 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 967 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
968 | extern void blk_queue_alignment_offset(struct request_queue *q, |
969 | unsigned int alignment); | |
7c958e32 | 970 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 971 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 972 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 973 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 974 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 975 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
976 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
977 | sector_t offset); | |
17be8c24 MP |
978 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
979 | sector_t offset); | |
c72758f3 MP |
980 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
981 | sector_t offset); | |
165125e1 | 982 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 983 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 984 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
985 | extern int blk_queue_dma_drain(struct request_queue *q, |
986 | dma_drain_needed_fn *dma_drain_needed, | |
987 | void *buf, unsigned int size); | |
ef9e3fac | 988 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
989 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
990 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 991 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
992 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
993 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 994 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 995 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
996 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
997 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 998 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 999 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 1000 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1001 | |
165125e1 | 1002 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1003 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1004 | extern long nr_blockdev_pages(void); |
1da177e4 | 1005 | |
09ac46c4 | 1006 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1007 | struct request_queue *blk_alloc_queue(gfp_t); |
1008 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1009 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1010 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1011 | |
6c954667 LM |
1012 | /* |
1013 | * block layer runtime pm functions | |
1014 | */ | |
47fafbc7 | 1015 | #ifdef CONFIG_PM |
6c954667 LM |
1016 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1017 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1018 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1019 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1020 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1021 | #else | |
1022 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1023 | struct device *dev) {} | |
1024 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1025 | { | |
1026 | return -ENOSYS; | |
1027 | } | |
1028 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1029 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1030 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1031 | #endif | |
1032 | ||
316cc67d | 1033 | /* |
75df7136 SJ |
1034 | * blk_plug permits building a queue of related requests by holding the I/O |
1035 | * fragments for a short period. This allows merging of sequential requests | |
1036 | * into single larger request. As the requests are moved from a per-task list to | |
1037 | * the device's request_queue in a batch, this results in improved scalability | |
1038 | * as the lock contention for request_queue lock is reduced. | |
1039 | * | |
1040 | * It is ok not to disable preemption when adding the request to the plug list | |
1041 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1042 | * the plug list when the task sleeps by itself. For details, please see | |
1043 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1044 | */ |
73c10101 | 1045 | struct blk_plug { |
75df7136 | 1046 | struct list_head list; /* requests */ |
320ae51f | 1047 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1048 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1049 | }; |
55c022bb SL |
1050 | #define BLK_MAX_REQUEST_COUNT 16 |
1051 | ||
9cbb1750 | 1052 | struct blk_plug_cb; |
74018dc3 | 1053 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1054 | struct blk_plug_cb { |
1055 | struct list_head list; | |
9cbb1750 N |
1056 | blk_plug_cb_fn callback; |
1057 | void *data; | |
048c9374 | 1058 | }; |
9cbb1750 N |
1059 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1060 | void *data, int size); | |
73c10101 JA |
1061 | extern void blk_start_plug(struct blk_plug *); |
1062 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1063 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1064 | |
1065 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1066 | { | |
1067 | struct blk_plug *plug = tsk->plug; | |
1068 | ||
a237c1c5 JA |
1069 | if (plug) |
1070 | blk_flush_plug_list(plug, false); | |
1071 | } | |
1072 | ||
1073 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1074 | { | |
1075 | struct blk_plug *plug = tsk->plug; | |
1076 | ||
88b996cd | 1077 | if (plug) |
f6603783 | 1078 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1079 | } |
1080 | ||
1081 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1082 | { | |
1083 | struct blk_plug *plug = tsk->plug; | |
1084 | ||
320ae51f JA |
1085 | return plug && |
1086 | (!list_empty(&plug->list) || | |
1087 | !list_empty(&plug->mq_list) || | |
1088 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1089 | } |
1090 | ||
1da177e4 LT |
1091 | /* |
1092 | * tag stuff | |
1093 | */ | |
165125e1 JA |
1094 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1095 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1096 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1097 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1098 | extern void blk_queue_free_tags(struct request_queue *); |
1099 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1100 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1101 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1102 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1103 | |
f583f492 DS |
1104 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1105 | int tag) | |
1106 | { | |
1107 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1108 | return NULL; | |
1109 | return bqt->tag_index[tag]; | |
1110 | } | |
dd3932ed CH |
1111 | |
1112 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1113 | ||
1114 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1115 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1116 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1117 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1118 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1119 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1120 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1121 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1122 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1123 | { |
2cf6d26a CH |
1124 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1125 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1126 | gfp_mask, flags); | |
fb2dce86 | 1127 | } |
e6fa0be6 | 1128 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1129 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1130 | { |
1131 | return blkdev_issue_zeroout(sb->s_bdev, | |
1132 | block << (sb->s_blocksize_bits - 9), | |
1133 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1134 | gfp_mask, true); |
e6fa0be6 | 1135 | } |
1da177e4 | 1136 | |
018e0446 | 1137 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1138 | |
eb28d31b MP |
1139 | enum blk_default_limits { |
1140 | BLK_MAX_SEGMENTS = 128, | |
1141 | BLK_SAFE_MAX_SECTORS = 255, | |
eb28d31b MP |
1142 | BLK_MAX_SEGMENT_SIZE = 65536, |
1143 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1144 | }; | |
0e435ac2 | 1145 | |
1da177e4 LT |
1146 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1147 | ||
ae03bf63 MP |
1148 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1149 | { | |
025146e1 | 1150 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1151 | } |
1152 | ||
1153 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1154 | { | |
025146e1 | 1155 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1156 | } |
1157 | ||
1158 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1159 | { | |
025146e1 | 1160 | return q->limits.max_sectors; |
ae03bf63 MP |
1161 | } |
1162 | ||
1163 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1164 | { | |
025146e1 | 1165 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1166 | } |
1167 | ||
8a78362c | 1168 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1169 | { |
8a78362c | 1170 | return q->limits.max_segments; |
ae03bf63 MP |
1171 | } |
1172 | ||
1173 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1174 | { | |
025146e1 | 1175 | return q->limits.max_segment_size; |
ae03bf63 MP |
1176 | } |
1177 | ||
e1defc4f | 1178 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1179 | { |
1180 | int retval = 512; | |
1181 | ||
025146e1 MP |
1182 | if (q && q->limits.logical_block_size) |
1183 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1184 | |
1185 | return retval; | |
1186 | } | |
1187 | ||
e1defc4f | 1188 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1189 | { |
e1defc4f | 1190 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1191 | } |
1192 | ||
c72758f3 MP |
1193 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1194 | { | |
1195 | return q->limits.physical_block_size; | |
1196 | } | |
1197 | ||
892b6f90 | 1198 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1199 | { |
1200 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1201 | } | |
1202 | ||
c72758f3 MP |
1203 | static inline unsigned int queue_io_min(struct request_queue *q) |
1204 | { | |
1205 | return q->limits.io_min; | |
1206 | } | |
1207 | ||
ac481c20 MP |
1208 | static inline int bdev_io_min(struct block_device *bdev) |
1209 | { | |
1210 | return queue_io_min(bdev_get_queue(bdev)); | |
1211 | } | |
1212 | ||
c72758f3 MP |
1213 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1214 | { | |
1215 | return q->limits.io_opt; | |
1216 | } | |
1217 | ||
ac481c20 MP |
1218 | static inline int bdev_io_opt(struct block_device *bdev) |
1219 | { | |
1220 | return queue_io_opt(bdev_get_queue(bdev)); | |
1221 | } | |
1222 | ||
c72758f3 MP |
1223 | static inline int queue_alignment_offset(struct request_queue *q) |
1224 | { | |
ac481c20 | 1225 | if (q->limits.misaligned) |
c72758f3 MP |
1226 | return -1; |
1227 | ||
ac481c20 | 1228 | return q->limits.alignment_offset; |
c72758f3 MP |
1229 | } |
1230 | ||
e03a72e1 | 1231 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1232 | { |
1233 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1234 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1235 | |
b8839b8c | 1236 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1237 | } |
1238 | ||
ac481c20 MP |
1239 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1240 | { | |
1241 | struct request_queue *q = bdev_get_queue(bdev); | |
1242 | ||
1243 | if (q->limits.misaligned) | |
1244 | return -1; | |
1245 | ||
1246 | if (bdev != bdev->bd_contains) | |
1247 | return bdev->bd_part->alignment_offset; | |
1248 | ||
1249 | return q->limits.alignment_offset; | |
1250 | } | |
1251 | ||
86b37281 MP |
1252 | static inline int queue_discard_alignment(struct request_queue *q) |
1253 | { | |
1254 | if (q->limits.discard_misaligned) | |
1255 | return -1; | |
1256 | ||
1257 | return q->limits.discard_alignment; | |
1258 | } | |
1259 | ||
e03a72e1 | 1260 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1261 | { |
59771079 | 1262 | unsigned int alignment, granularity, offset; |
dd3d145d | 1263 | |
a934a00a MP |
1264 | if (!lim->max_discard_sectors) |
1265 | return 0; | |
1266 | ||
59771079 LT |
1267 | /* Why are these in bytes, not sectors? */ |
1268 | alignment = lim->discard_alignment >> 9; | |
1269 | granularity = lim->discard_granularity >> 9; | |
1270 | if (!granularity) | |
1271 | return 0; | |
1272 | ||
1273 | /* Offset of the partition start in 'granularity' sectors */ | |
1274 | offset = sector_div(sector, granularity); | |
1275 | ||
1276 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1277 | offset = (granularity + alignment - offset) % granularity; | |
1278 | ||
1279 | /* Turn it back into bytes, gaah */ | |
1280 | return offset << 9; | |
86b37281 MP |
1281 | } |
1282 | ||
c6e66634 PB |
1283 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1284 | { | |
1285 | struct request_queue *q = bdev_get_queue(bdev); | |
1286 | ||
1287 | if (bdev != bdev->bd_contains) | |
1288 | return bdev->bd_part->discard_alignment; | |
1289 | ||
1290 | return q->limits.discard_alignment; | |
1291 | } | |
1292 | ||
98262f27 MP |
1293 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1294 | { | |
a934a00a | 1295 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1296 | return 1; |
1297 | ||
1298 | return 0; | |
1299 | } | |
1300 | ||
1301 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1302 | { | |
1303 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1304 | } | |
1305 | ||
4363ac7c MP |
1306 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1307 | { | |
1308 | struct request_queue *q = bdev_get_queue(bdev); | |
1309 | ||
1310 | if (q) | |
1311 | return q->limits.max_write_same_sectors; | |
1312 | ||
1313 | return 0; | |
1314 | } | |
1315 | ||
165125e1 | 1316 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1317 | { |
482eb689 | 1318 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1319 | } |
1320 | ||
14417799 | 1321 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1322 | unsigned int len) |
1323 | { | |
1324 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1325 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1326 | } |
1327 | ||
1da177e4 LT |
1328 | /* assumes size > 256 */ |
1329 | static inline unsigned int blksize_bits(unsigned int size) | |
1330 | { | |
1331 | unsigned int bits = 8; | |
1332 | do { | |
1333 | bits++; | |
1334 | size >>= 1; | |
1335 | } while (size > 256); | |
1336 | return bits; | |
1337 | } | |
1338 | ||
2befb9e3 | 1339 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1340 | { |
1341 | return bdev->bd_block_size; | |
1342 | } | |
1343 | ||
f3876930 | 1344 | static inline bool queue_flush_queueable(struct request_queue *q) |
1345 | { | |
1346 | return !q->flush_not_queueable; | |
1347 | } | |
1348 | ||
1da177e4 LT |
1349 | typedef struct {struct page *v;} Sector; |
1350 | ||
1351 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1352 | ||
1353 | static inline void put_dev_sector(Sector p) | |
1354 | { | |
1355 | page_cache_release(p.v); | |
1356 | } | |
1357 | ||
1358 | struct work_struct; | |
59c3d45e JA |
1359 | int kblockd_schedule_work(struct work_struct *work); |
1360 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1361 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1362 | |
9195291e | 1363 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1364 | /* |
1365 | * This should not be using sched_clock(). A real patch is in progress | |
1366 | * to fix this up, until that is in place we need to disable preemption | |
1367 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1368 | */ | |
9195291e DS |
1369 | static inline void set_start_time_ns(struct request *req) |
1370 | { | |
28f4197e | 1371 | preempt_disable(); |
9195291e | 1372 | req->start_time_ns = sched_clock(); |
28f4197e | 1373 | preempt_enable(); |
9195291e DS |
1374 | } |
1375 | ||
1376 | static inline void set_io_start_time_ns(struct request *req) | |
1377 | { | |
28f4197e | 1378 | preempt_disable(); |
9195291e | 1379 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1380 | preempt_enable(); |
9195291e | 1381 | } |
84c124da DS |
1382 | |
1383 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1384 | { | |
1385 | return req->start_time_ns; | |
1386 | } | |
1387 | ||
1388 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1389 | { | |
1390 | return req->io_start_time_ns; | |
1391 | } | |
9195291e DS |
1392 | #else |
1393 | static inline void set_start_time_ns(struct request *req) {} | |
1394 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1395 | static inline uint64_t rq_start_time_ns(struct request *req) |
1396 | { | |
1397 | return 0; | |
1398 | } | |
1399 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1400 | { | |
1401 | return 0; | |
1402 | } | |
9195291e DS |
1403 | #endif |
1404 | ||
1da177e4 LT |
1405 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1406 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1407 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1408 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1409 | ||
7ba1ba12 MP |
1410 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1411 | ||
8288f496 MP |
1412 | enum blk_integrity_flags { |
1413 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1414 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1415 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1416 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1417 | }; |
7ba1ba12 | 1418 | |
18593088 | 1419 | struct blk_integrity_iter { |
7ba1ba12 MP |
1420 | void *prot_buf; |
1421 | void *data_buf; | |
3be91c4a | 1422 | sector_t seed; |
7ba1ba12 | 1423 | unsigned int data_size; |
3be91c4a | 1424 | unsigned short interval; |
7ba1ba12 MP |
1425 | const char *disk_name; |
1426 | }; | |
1427 | ||
18593088 | 1428 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 MP |
1429 | |
1430 | struct blk_integrity { | |
18593088 MP |
1431 | integrity_processing_fn *generate_fn; |
1432 | integrity_processing_fn *verify_fn; | |
7ba1ba12 MP |
1433 | |
1434 | unsigned short flags; | |
1435 | unsigned short tuple_size; | |
3be91c4a | 1436 | unsigned short interval; |
7ba1ba12 MP |
1437 | unsigned short tag_size; |
1438 | ||
1439 | const char *name; | |
1440 | ||
1441 | struct kobject kobj; | |
1442 | }; | |
1443 | ||
a63a5cf8 | 1444 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1445 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1446 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1447 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1448 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1449 | struct scatterlist *); | |
1450 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1451 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1452 | struct request *); | |
1453 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1454 | struct bio *); | |
7ba1ba12 | 1455 | |
b04accc4 JA |
1456 | static inline |
1457 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1458 | { | |
1459 | return bdev->bd_disk->integrity; | |
1460 | } | |
1461 | ||
b02739b0 MP |
1462 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1463 | { | |
1464 | return disk->integrity; | |
1465 | } | |
1466 | ||
180b2f95 | 1467 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1468 | { |
180b2f95 | 1469 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1470 | } |
1471 | ||
13f05c8d MP |
1472 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1473 | unsigned int segs) | |
1474 | { | |
1475 | q->limits.max_integrity_segments = segs; | |
1476 | } | |
1477 | ||
1478 | static inline unsigned short | |
1479 | queue_max_integrity_segments(struct request_queue *q) | |
1480 | { | |
1481 | return q->limits.max_integrity_segments; | |
1482 | } | |
1483 | ||
7ba1ba12 MP |
1484 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1485 | ||
fd83240a SR |
1486 | struct bio; |
1487 | struct block_device; | |
1488 | struct gendisk; | |
1489 | struct blk_integrity; | |
1490 | ||
1491 | static inline int blk_integrity_rq(struct request *rq) | |
1492 | { | |
1493 | return 0; | |
1494 | } | |
1495 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1496 | struct bio *b) | |
1497 | { | |
1498 | return 0; | |
1499 | } | |
1500 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1501 | struct bio *b, | |
1502 | struct scatterlist *s) | |
1503 | { | |
1504 | return 0; | |
1505 | } | |
1506 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1507 | { | |
61a04e5b | 1508 | return NULL; |
fd83240a SR |
1509 | } |
1510 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1511 | { | |
1512 | return NULL; | |
1513 | } | |
1514 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1515 | { | |
1516 | return 0; | |
1517 | } | |
1518 | static inline int blk_integrity_register(struct gendisk *d, | |
1519 | struct blk_integrity *b) | |
1520 | { | |
1521 | return 0; | |
1522 | } | |
1523 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1524 | { | |
1525 | } | |
1526 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1527 | unsigned int segs) | |
1528 | { | |
1529 | } | |
1530 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1531 | { | |
1532 | return 0; | |
1533 | } | |
4eaf99be MP |
1534 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1535 | struct request *r1, | |
1536 | struct request *r2) | |
fd83240a | 1537 | { |
cb1a5ab6 | 1538 | return true; |
fd83240a | 1539 | } |
4eaf99be MP |
1540 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1541 | struct request *r, | |
1542 | struct bio *b) | |
fd83240a | 1543 | { |
cb1a5ab6 | 1544 | return true; |
fd83240a SR |
1545 | } |
1546 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1547 | { | |
1548 | return 0; | |
1549 | } | |
7ba1ba12 MP |
1550 | |
1551 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1552 | ||
08f85851 | 1553 | struct block_device_operations { |
d4430d62 | 1554 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1555 | void (*release) (struct gendisk *, fmode_t); |
47a191fd | 1556 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
d4430d62 AV |
1557 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1558 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
dd22f551 MW |
1559 | long (*direct_access)(struct block_device *, sector_t, |
1560 | void **, unsigned long *pfn, long size); | |
77ea887e TH |
1561 | unsigned int (*check_events) (struct gendisk *disk, |
1562 | unsigned int clearing); | |
1563 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1564 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1565 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1566 | int (*revalidate_disk) (struct gendisk *); |
1567 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1568 | /* this callback is with swap_lock and sometimes page table lock held */ |
1569 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1570 | struct module *owner; |
1571 | }; | |
1572 | ||
633a08b8 AV |
1573 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1574 | unsigned long); | |
47a191fd MW |
1575 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1576 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1577 | struct writeback_control *); | |
dd22f551 MW |
1578 | extern long bdev_direct_access(struct block_device *, sector_t, void **addr, |
1579 | unsigned long *pfn, long size); | |
9361401e | 1580 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1581 | |
1582 | struct block_device; | |
1583 | ||
9361401e DH |
1584 | /* |
1585 | * stubs for when the block layer is configured out | |
1586 | */ | |
1587 | #define buffer_heads_over_limit 0 | |
1588 | ||
9361401e DH |
1589 | static inline long nr_blockdev_pages(void) |
1590 | { | |
1591 | return 0; | |
1592 | } | |
1593 | ||
1f940bdf JA |
1594 | struct blk_plug { |
1595 | }; | |
1596 | ||
1597 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1598 | { |
1599 | } | |
1600 | ||
1f940bdf | 1601 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1602 | { |
1603 | } | |
1604 | ||
1f940bdf | 1605 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1606 | { |
1607 | } | |
1608 | ||
a237c1c5 JA |
1609 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1610 | { | |
1611 | } | |
1612 | ||
1613 | ||
73c10101 JA |
1614 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1615 | { | |
1616 | return false; | |
1617 | } | |
1618 | ||
ac13a829 FF |
1619 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1620 | sector_t *error_sector) | |
1621 | { | |
1622 | return 0; | |
1623 | } | |
1624 | ||
9361401e DH |
1625 | #endif /* CONFIG_BLOCK */ |
1626 | ||
1da177e4 | 1627 | #endif |