]>
Commit | Line | Data |
---|---|---|
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> | |
15 | #include <linux/backing-dev.h> | |
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> |
1da177e4 LT |
25 | |
26 | #include <asm/scatterlist.h> | |
27 | ||
de477254 | 28 | struct module; |
21b2f0c8 CH |
29 | struct scsi_ioctl_command; |
30 | ||
1da177e4 | 31 | struct request_queue; |
1da177e4 | 32 | struct elevator_queue; |
2056a782 | 33 | struct blk_trace; |
3d6392cf JA |
34 | struct request; |
35 | struct sg_io_hdr; | |
aa387cc8 | 36 | struct bsg_job; |
3c798398 | 37 | struct blkcg_gq; |
7c94e1c1 | 38 | struct blk_flush_queue; |
1da177e4 LT |
39 | |
40 | #define BLKDEV_MIN_RQ 4 | |
41 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
42 | ||
8bd435b3 TH |
43 | /* |
44 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
45 | * Defined here to simplify include dependency. | |
46 | */ | |
47 | #define BLKCG_MAX_POLS 2 | |
48 | ||
1da177e4 | 49 | struct request; |
8ffdc655 | 50 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 51 | |
5b788ce3 TH |
52 | #define BLK_RL_SYNCFULL (1U << 0) |
53 | #define BLK_RL_ASYNCFULL (1U << 1) | |
54 | ||
1da177e4 | 55 | struct request_list { |
5b788ce3 | 56 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
57 | #ifdef CONFIG_BLK_CGROUP |
58 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
59 | #endif | |
1faa16d2 JA |
60 | /* |
61 | * count[], starved[], and wait[] are indexed by | |
62 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
63 | */ | |
8a5ecdd4 TH |
64 | int count[2]; |
65 | int starved[2]; | |
66 | mempool_t *rq_pool; | |
67 | wait_queue_head_t wait[2]; | |
5b788ce3 | 68 | unsigned int flags; |
1da177e4 LT |
69 | }; |
70 | ||
4aff5e23 JA |
71 | /* |
72 | * request command types | |
73 | */ | |
74 | enum rq_cmd_type_bits { | |
75 | REQ_TYPE_FS = 1, /* fs request */ | |
76 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
b42171ef | 77 | REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
4aff5e23 JA |
78 | }; |
79 | ||
1da177e4 LT |
80 | #define BLK_MAX_CDB 16 |
81 | ||
82 | /* | |
af76e555 CH |
83 | * Try to put the fields that are referenced together in the same cacheline. |
84 | * | |
85 | * If you modify this structure, make sure to update blk_rq_init() and | |
86 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
87 | */ |
88 | struct request { | |
6897fc22 | 89 | struct list_head queuelist; |
320ae51f JA |
90 | union { |
91 | struct call_single_data csd; | |
8b4922d3 | 92 | unsigned long fifo_time; |
320ae51f | 93 | }; |
ff856bad | 94 | |
165125e1 | 95 | struct request_queue *q; |
320ae51f | 96 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 97 | |
5953316d | 98 | u64 cmd_flags; |
b42171ef | 99 | unsigned cmd_type; |
242f9dcb | 100 | unsigned long atomic_flags; |
1da177e4 | 101 | |
181fdde3 RK |
102 | int cpu; |
103 | ||
a2dec7b3 | 104 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 105 | unsigned int __data_len; /* total data len */ |
181fdde3 | 106 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
107 | |
108 | struct bio *bio; | |
109 | struct bio *biotail; | |
110 | ||
360f92c2 JA |
111 | /* |
112 | * The hash is used inside the scheduler, and killed once the | |
113 | * request reaches the dispatch list. The ipi_list is only used | |
114 | * to queue the request for softirq completion, which is long | |
115 | * after the request has been unhashed (and even removed from | |
116 | * the dispatch list). | |
117 | */ | |
118 | union { | |
119 | struct hlist_node hash; /* merge hash */ | |
120 | struct list_head ipi_list; | |
121 | }; | |
122 | ||
e6a1c874 JA |
123 | /* |
124 | * The rb_node is only used inside the io scheduler, requests | |
125 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 126 | * completion_data share space with the rb_node. |
e6a1c874 JA |
127 | */ |
128 | union { | |
129 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 130 | void *completion_data; |
e6a1c874 | 131 | }; |
9817064b | 132 | |
ff7d145f | 133 | /* |
7f1dc8a2 | 134 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
135 | * more they have to dynamically allocate it. Flush requests are |
136 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 137 | * space with the elevator data. |
ff7d145f | 138 | */ |
c186794d | 139 | union { |
a612fddf TH |
140 | struct { |
141 | struct io_cq *icq; | |
142 | void *priv[2]; | |
143 | } elv; | |
144 | ||
c186794d MS |
145 | struct { |
146 | unsigned int seq; | |
147 | struct list_head list; | |
4853abaa | 148 | rq_end_io_fn *saved_end_io; |
c186794d MS |
149 | } flush; |
150 | }; | |
ff7d145f | 151 | |
8f34ee75 | 152 | struct gendisk *rq_disk; |
09e099d4 | 153 | struct hd_struct *part; |
1da177e4 | 154 | unsigned long start_time; |
9195291e | 155 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 156 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
157 | unsigned long long start_time_ns; |
158 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
159 | #endif | |
1da177e4 LT |
160 | /* Number of scatter-gather DMA addr+len pairs after |
161 | * physical address coalescing is performed. | |
162 | */ | |
163 | unsigned short nr_phys_segments; | |
13f05c8d MP |
164 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
165 | unsigned short nr_integrity_segments; | |
166 | #endif | |
1da177e4 | 167 | |
8f34ee75 JA |
168 | unsigned short ioprio; |
169 | ||
731ec497 | 170 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 171 | |
cdd60262 JA |
172 | int tag; |
173 | int errors; | |
174 | ||
1da177e4 LT |
175 | /* |
176 | * when request is used as a packet command carrier | |
177 | */ | |
d7e3c324 FT |
178 | unsigned char __cmd[BLK_MAX_CDB]; |
179 | unsigned char *cmd; | |
181fdde3 | 180 | unsigned short cmd_len; |
1da177e4 | 181 | |
7a85f889 | 182 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 183 | unsigned int sense_len; |
c3a4d78c | 184 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
185 | void *sense; |
186 | ||
242f9dcb JA |
187 | unsigned long deadline; |
188 | struct list_head timeout_list; | |
1da177e4 | 189 | unsigned int timeout; |
17e01f21 | 190 | int retries; |
1da177e4 | 191 | |
1da177e4 | 192 | /* |
c00895ab | 193 | * completion callback. |
1da177e4 LT |
194 | */ |
195 | rq_end_io_fn *end_io; | |
196 | void *end_io_data; | |
abae1fde FT |
197 | |
198 | /* for bidi */ | |
199 | struct request *next_rq; | |
1da177e4 LT |
200 | }; |
201 | ||
766ca442 FLVC |
202 | static inline unsigned short req_get_ioprio(struct request *req) |
203 | { | |
204 | return req->ioprio; | |
205 | } | |
206 | ||
1da177e4 LT |
207 | #include <linux/elevator.h> |
208 | ||
320ae51f JA |
209 | struct blk_queue_ctx; |
210 | ||
165125e1 | 211 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 212 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 213 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 214 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
215 | |
216 | struct bio_vec; | |
cc371e66 AK |
217 | struct bvec_merge_data { |
218 | struct block_device *bi_bdev; | |
219 | sector_t bi_sector; | |
220 | unsigned bi_size; | |
221 | unsigned long bi_rw; | |
222 | }; | |
223 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
224 | struct bio_vec *); | |
ff856bad | 225 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 226 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 227 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 228 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 229 | |
242f9dcb JA |
230 | enum blk_eh_timer_return { |
231 | BLK_EH_NOT_HANDLED, | |
232 | BLK_EH_HANDLED, | |
233 | BLK_EH_RESET_TIMER, | |
234 | }; | |
235 | ||
236 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
237 | ||
1da177e4 LT |
238 | enum blk_queue_state { |
239 | Queue_down, | |
240 | Queue_up, | |
241 | }; | |
242 | ||
1da177e4 LT |
243 | struct blk_queue_tag { |
244 | struct request **tag_index; /* map of busy tags */ | |
245 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
246 | int busy; /* current depth */ |
247 | int max_depth; /* what we will send to device */ | |
ba025082 | 248 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 249 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
250 | int alloc_policy; /* tag allocation policy */ |
251 | int next_tag; /* next tag */ | |
1da177e4 | 252 | }; |
ee1b6f7a SL |
253 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
254 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 255 | |
abf54393 FT |
256 | #define BLK_SCSI_MAX_CMDS (256) |
257 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
258 | ||
025146e1 MP |
259 | struct queue_limits { |
260 | unsigned long bounce_pfn; | |
261 | unsigned long seg_boundary_mask; | |
262 | ||
263 | unsigned int max_hw_sectors; | |
762380ad | 264 | unsigned int chunk_sectors; |
025146e1 MP |
265 | unsigned int max_sectors; |
266 | unsigned int max_segment_size; | |
c72758f3 MP |
267 | unsigned int physical_block_size; |
268 | unsigned int alignment_offset; | |
269 | unsigned int io_min; | |
270 | unsigned int io_opt; | |
67efc925 | 271 | unsigned int max_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 JA |
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); |
5f1b670d | 778 | extern void blk_rq_prep_clone(struct request *rq, struct request *rq_src); |
82124d60 KU |
779 | extern int blk_insert_cloned_request(struct request_queue *q, |
780 | struct request *rq); | |
3cca6dc1 | 781 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 782 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 783 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
784 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
785 | unsigned int, void __user *); | |
74f3c8af AV |
786 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
787 | unsigned int, void __user *); | |
e915e872 AV |
788 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
789 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 790 | |
5a7bbad2 | 791 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 792 | |
3fcfab16 AM |
793 | /* |
794 | * A queue has just exitted congestion. Note this in the global counter of | |
795 | * congested queues, and wake up anyone who was waiting for requests to be | |
796 | * put back. | |
797 | */ | |
8aa7e847 | 798 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 799 | { |
8aa7e847 | 800 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
801 | } |
802 | ||
803 | /* | |
804 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
805 | * state flags and increment the global gounter of congested queues. | |
806 | */ | |
8aa7e847 | 807 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 808 | { |
8aa7e847 | 809 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
810 | } |
811 | ||
165125e1 JA |
812 | extern void blk_start_queue(struct request_queue *q); |
813 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 814 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 815 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 816 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 817 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 818 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 819 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 820 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
821 | struct rq_map_data *, void __user *, unsigned long, |
822 | gfp_t); | |
8e5cfc45 | 823 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
824 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
825 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
826 | struct rq_map_data *, const struct iov_iter *, |
827 | gfp_t); | |
165125e1 | 828 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 829 | struct request *, int); |
165125e1 | 830 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 831 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 832 | |
165125e1 | 833 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 834 | { |
ff9ea323 | 835 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
836 | } |
837 | ||
5efccd17 | 838 | /* |
80a761fd TH |
839 | * blk_rq_pos() : the current sector |
840 | * blk_rq_bytes() : bytes left in the entire request | |
841 | * blk_rq_cur_bytes() : bytes left in the current segment | |
842 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
843 | * blk_rq_sectors() : sectors left in the entire request | |
844 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 845 | */ |
5b93629b TH |
846 | static inline sector_t blk_rq_pos(const struct request *rq) |
847 | { | |
a2dec7b3 | 848 | return rq->__sector; |
2e46e8b2 TH |
849 | } |
850 | ||
851 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
852 | { | |
a2dec7b3 | 853 | return rq->__data_len; |
5b93629b TH |
854 | } |
855 | ||
2e46e8b2 TH |
856 | static inline int blk_rq_cur_bytes(const struct request *rq) |
857 | { | |
858 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
859 | } | |
5efccd17 | 860 | |
80a761fd TH |
861 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
862 | ||
5b93629b TH |
863 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
864 | { | |
2e46e8b2 | 865 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
866 | } |
867 | ||
868 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
869 | { | |
2e46e8b2 | 870 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
871 | } |
872 | ||
f31dc1cd MP |
873 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
874 | unsigned int cmd_flags) | |
875 | { | |
876 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 877 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 878 | |
4363ac7c MP |
879 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
880 | return q->limits.max_write_same_sectors; | |
881 | ||
f31dc1cd MP |
882 | return q->limits.max_sectors; |
883 | } | |
884 | ||
762380ad JA |
885 | /* |
886 | * Return maximum size of a request at given offset. Only valid for | |
887 | * file system requests. | |
888 | */ | |
889 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
890 | sector_t offset) | |
891 | { | |
892 | if (!q->limits.chunk_sectors) | |
736ed4de | 893 | return q->limits.max_sectors; |
762380ad JA |
894 | |
895 | return q->limits.chunk_sectors - | |
896 | (offset & (q->limits.chunk_sectors - 1)); | |
897 | } | |
898 | ||
f31dc1cd MP |
899 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
900 | { | |
901 | struct request_queue *q = rq->q; | |
902 | ||
903 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
904 | return q->limits.max_hw_sectors; | |
905 | ||
762380ad JA |
906 | if (!q->limits.chunk_sectors) |
907 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
908 | ||
909 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), | |
910 | blk_queue_get_max_sectors(q, rq->cmd_flags)); | |
f31dc1cd MP |
911 | } |
912 | ||
75afb352 JN |
913 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
914 | { | |
915 | unsigned int nr_bios = 0; | |
916 | struct bio *bio; | |
917 | ||
918 | __rq_for_each_bio(bio, rq) | |
919 | nr_bios++; | |
920 | ||
921 | return nr_bios; | |
922 | } | |
923 | ||
9934c8c0 TH |
924 | /* |
925 | * Request issue related functions. | |
926 | */ | |
927 | extern struct request *blk_peek_request(struct request_queue *q); | |
928 | extern void blk_start_request(struct request *rq); | |
929 | extern struct request *blk_fetch_request(struct request_queue *q); | |
930 | ||
1da177e4 | 931 | /* |
2e60e022 TH |
932 | * Request completion related functions. |
933 | * | |
934 | * blk_update_request() completes given number of bytes and updates | |
935 | * the request without completing it. | |
936 | * | |
f06d9a2b TH |
937 | * blk_end_request() and friends. __blk_end_request() must be called |
938 | * with the request queue spinlock acquired. | |
1da177e4 LT |
939 | * |
940 | * Several drivers define their own end_request and call | |
3bcddeac KU |
941 | * blk_end_request() for parts of the original function. |
942 | * This prevents code duplication in drivers. | |
1da177e4 | 943 | */ |
2e60e022 TH |
944 | extern bool blk_update_request(struct request *rq, int error, |
945 | unsigned int nr_bytes); | |
12120077 | 946 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
947 | extern bool blk_end_request(struct request *rq, int error, |
948 | unsigned int nr_bytes); | |
949 | extern void blk_end_request_all(struct request *rq, int error); | |
950 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 951 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
952 | extern bool __blk_end_request(struct request *rq, int error, |
953 | unsigned int nr_bytes); | |
954 | extern void __blk_end_request_all(struct request *rq, int error); | |
955 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 956 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 957 | |
ff856bad | 958 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
959 | extern void __blk_complete_request(struct request *); |
960 | extern void blk_abort_request(struct request *); | |
28018c24 | 961 | extern void blk_unprep_request(struct request *); |
ff856bad | 962 | |
1da177e4 LT |
963 | /* |
964 | * Access functions for manipulating queue properties | |
965 | */ | |
165125e1 | 966 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 967 | spinlock_t *lock, int node_id); |
165125e1 | 968 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
969 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
970 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
971 | extern void blk_cleanup_queue(struct request_queue *); |
972 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
973 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 974 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 975 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 976 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 977 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 978 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
979 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
980 | unsigned int max_discard_sectors); | |
4363ac7c MP |
981 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
982 | unsigned int max_write_same_sectors); | |
e1defc4f | 983 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 984 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
985 | extern void blk_queue_alignment_offset(struct request_queue *q, |
986 | unsigned int alignment); | |
7c958e32 | 987 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 988 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 989 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 990 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 991 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 992 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
993 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
994 | sector_t offset); | |
17be8c24 MP |
995 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
996 | sector_t offset); | |
c72758f3 MP |
997 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
998 | sector_t offset); | |
165125e1 | 999 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1000 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1001 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1002 | extern int blk_queue_dma_drain(struct request_queue *q, |
1003 | dma_drain_needed_fn *dma_drain_needed, | |
1004 | void *buf, unsigned int size); | |
ef9e3fac | 1005 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
1006 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
1007 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 1008 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
1009 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
1010 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 1011 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1012 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1013 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1014 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 1015 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 1016 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 1017 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1018 | |
165125e1 | 1019 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1020 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1021 | extern long nr_blockdev_pages(void); |
1da177e4 | 1022 | |
09ac46c4 | 1023 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1024 | struct request_queue *blk_alloc_queue(gfp_t); |
1025 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1026 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 1027 | |
6c954667 LM |
1028 | /* |
1029 | * block layer runtime pm functions | |
1030 | */ | |
47fafbc7 | 1031 | #ifdef CONFIG_PM |
6c954667 LM |
1032 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1033 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1034 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1035 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1036 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1037 | #else | |
1038 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1039 | struct device *dev) {} | |
1040 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1041 | { | |
1042 | return -ENOSYS; | |
1043 | } | |
1044 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1045 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1046 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1047 | #endif | |
1048 | ||
316cc67d | 1049 | /* |
75df7136 SJ |
1050 | * blk_plug permits building a queue of related requests by holding the I/O |
1051 | * fragments for a short period. This allows merging of sequential requests | |
1052 | * into single larger request. As the requests are moved from a per-task list to | |
1053 | * the device's request_queue in a batch, this results in improved scalability | |
1054 | * as the lock contention for request_queue lock is reduced. | |
1055 | * | |
1056 | * It is ok not to disable preemption when adding the request to the plug list | |
1057 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1058 | * the plug list when the task sleeps by itself. For details, please see | |
1059 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1060 | */ |
73c10101 | 1061 | struct blk_plug { |
75df7136 | 1062 | struct list_head list; /* requests */ |
320ae51f | 1063 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1064 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1065 | }; |
55c022bb SL |
1066 | #define BLK_MAX_REQUEST_COUNT 16 |
1067 | ||
9cbb1750 | 1068 | struct blk_plug_cb; |
74018dc3 | 1069 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1070 | struct blk_plug_cb { |
1071 | struct list_head list; | |
9cbb1750 N |
1072 | blk_plug_cb_fn callback; |
1073 | void *data; | |
048c9374 | 1074 | }; |
9cbb1750 N |
1075 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1076 | void *data, int size); | |
73c10101 JA |
1077 | extern void blk_start_plug(struct blk_plug *); |
1078 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1079 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1080 | |
1081 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1082 | { | |
1083 | struct blk_plug *plug = tsk->plug; | |
1084 | ||
a237c1c5 JA |
1085 | if (plug) |
1086 | blk_flush_plug_list(plug, false); | |
1087 | } | |
1088 | ||
1089 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1090 | { | |
1091 | struct blk_plug *plug = tsk->plug; | |
1092 | ||
88b996cd | 1093 | if (plug) |
f6603783 | 1094 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1095 | } |
1096 | ||
1097 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1098 | { | |
1099 | struct blk_plug *plug = tsk->plug; | |
1100 | ||
320ae51f JA |
1101 | return plug && |
1102 | (!list_empty(&plug->list) || | |
1103 | !list_empty(&plug->mq_list) || | |
1104 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1105 | } |
1106 | ||
1da177e4 LT |
1107 | /* |
1108 | * tag stuff | |
1109 | */ | |
165125e1 JA |
1110 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1111 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1112 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1113 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1114 | extern void blk_queue_free_tags(struct request_queue *); |
1115 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1116 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1117 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1118 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1119 | |
f583f492 DS |
1120 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1121 | int tag) | |
1122 | { | |
1123 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1124 | return NULL; | |
1125 | return bqt->tag_index[tag]; | |
1126 | } | |
dd3932ed CH |
1127 | |
1128 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1129 | ||
1130 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1131 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1132 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1133 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1134 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1135 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1136 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1137 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1138 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1139 | { |
2cf6d26a CH |
1140 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1141 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1142 | gfp_mask, flags); | |
fb2dce86 | 1143 | } |
e6fa0be6 | 1144 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1145 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1146 | { |
1147 | return blkdev_issue_zeroout(sb->s_bdev, | |
1148 | block << (sb->s_blocksize_bits - 9), | |
1149 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1150 | gfp_mask, true); |
e6fa0be6 | 1151 | } |
1da177e4 | 1152 | |
018e0446 | 1153 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1154 | |
eb28d31b MP |
1155 | enum blk_default_limits { |
1156 | BLK_MAX_SEGMENTS = 128, | |
1157 | BLK_SAFE_MAX_SECTORS = 255, | |
eb28d31b MP |
1158 | BLK_MAX_SEGMENT_SIZE = 65536, |
1159 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1160 | }; | |
0e435ac2 | 1161 | |
1da177e4 LT |
1162 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1163 | ||
ae03bf63 MP |
1164 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1165 | { | |
025146e1 | 1166 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1167 | } |
1168 | ||
1169 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1170 | { | |
025146e1 | 1171 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1172 | } |
1173 | ||
1174 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1175 | { | |
025146e1 | 1176 | return q->limits.max_sectors; |
ae03bf63 MP |
1177 | } |
1178 | ||
1179 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1180 | { | |
025146e1 | 1181 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1182 | } |
1183 | ||
8a78362c | 1184 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1185 | { |
8a78362c | 1186 | return q->limits.max_segments; |
ae03bf63 MP |
1187 | } |
1188 | ||
1189 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1190 | { | |
025146e1 | 1191 | return q->limits.max_segment_size; |
ae03bf63 MP |
1192 | } |
1193 | ||
e1defc4f | 1194 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1195 | { |
1196 | int retval = 512; | |
1197 | ||
025146e1 MP |
1198 | if (q && q->limits.logical_block_size) |
1199 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1200 | |
1201 | return retval; | |
1202 | } | |
1203 | ||
e1defc4f | 1204 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1205 | { |
e1defc4f | 1206 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1207 | } |
1208 | ||
c72758f3 MP |
1209 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1210 | { | |
1211 | return q->limits.physical_block_size; | |
1212 | } | |
1213 | ||
892b6f90 | 1214 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1215 | { |
1216 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1217 | } | |
1218 | ||
c72758f3 MP |
1219 | static inline unsigned int queue_io_min(struct request_queue *q) |
1220 | { | |
1221 | return q->limits.io_min; | |
1222 | } | |
1223 | ||
ac481c20 MP |
1224 | static inline int bdev_io_min(struct block_device *bdev) |
1225 | { | |
1226 | return queue_io_min(bdev_get_queue(bdev)); | |
1227 | } | |
1228 | ||
c72758f3 MP |
1229 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1230 | { | |
1231 | return q->limits.io_opt; | |
1232 | } | |
1233 | ||
ac481c20 MP |
1234 | static inline int bdev_io_opt(struct block_device *bdev) |
1235 | { | |
1236 | return queue_io_opt(bdev_get_queue(bdev)); | |
1237 | } | |
1238 | ||
c72758f3 MP |
1239 | static inline int queue_alignment_offset(struct request_queue *q) |
1240 | { | |
ac481c20 | 1241 | if (q->limits.misaligned) |
c72758f3 MP |
1242 | return -1; |
1243 | ||
ac481c20 | 1244 | return q->limits.alignment_offset; |
c72758f3 MP |
1245 | } |
1246 | ||
e03a72e1 | 1247 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1248 | { |
1249 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1250 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1251 | |
b8839b8c | 1252 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1253 | } |
1254 | ||
ac481c20 MP |
1255 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1256 | { | |
1257 | struct request_queue *q = bdev_get_queue(bdev); | |
1258 | ||
1259 | if (q->limits.misaligned) | |
1260 | return -1; | |
1261 | ||
1262 | if (bdev != bdev->bd_contains) | |
1263 | return bdev->bd_part->alignment_offset; | |
1264 | ||
1265 | return q->limits.alignment_offset; | |
1266 | } | |
1267 | ||
86b37281 MP |
1268 | static inline int queue_discard_alignment(struct request_queue *q) |
1269 | { | |
1270 | if (q->limits.discard_misaligned) | |
1271 | return -1; | |
1272 | ||
1273 | return q->limits.discard_alignment; | |
1274 | } | |
1275 | ||
e03a72e1 | 1276 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1277 | { |
59771079 | 1278 | unsigned int alignment, granularity, offset; |
dd3d145d | 1279 | |
a934a00a MP |
1280 | if (!lim->max_discard_sectors) |
1281 | return 0; | |
1282 | ||
59771079 LT |
1283 | /* Why are these in bytes, not sectors? */ |
1284 | alignment = lim->discard_alignment >> 9; | |
1285 | granularity = lim->discard_granularity >> 9; | |
1286 | if (!granularity) | |
1287 | return 0; | |
1288 | ||
1289 | /* Offset of the partition start in 'granularity' sectors */ | |
1290 | offset = sector_div(sector, granularity); | |
1291 | ||
1292 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1293 | offset = (granularity + alignment - offset) % granularity; | |
1294 | ||
1295 | /* Turn it back into bytes, gaah */ | |
1296 | return offset << 9; | |
86b37281 MP |
1297 | } |
1298 | ||
c6e66634 PB |
1299 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1300 | { | |
1301 | struct request_queue *q = bdev_get_queue(bdev); | |
1302 | ||
1303 | if (bdev != bdev->bd_contains) | |
1304 | return bdev->bd_part->discard_alignment; | |
1305 | ||
1306 | return q->limits.discard_alignment; | |
1307 | } | |
1308 | ||
98262f27 MP |
1309 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1310 | { | |
a934a00a | 1311 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1312 | return 1; |
1313 | ||
1314 | return 0; | |
1315 | } | |
1316 | ||
1317 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1318 | { | |
1319 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1320 | } | |
1321 | ||
4363ac7c MP |
1322 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1323 | { | |
1324 | struct request_queue *q = bdev_get_queue(bdev); | |
1325 | ||
1326 | if (q) | |
1327 | return q->limits.max_write_same_sectors; | |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
165125e1 | 1332 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1333 | { |
482eb689 | 1334 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1335 | } |
1336 | ||
14417799 | 1337 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1338 | unsigned int len) |
1339 | { | |
1340 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1341 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1342 | } |
1343 | ||
1da177e4 LT |
1344 | /* assumes size > 256 */ |
1345 | static inline unsigned int blksize_bits(unsigned int size) | |
1346 | { | |
1347 | unsigned int bits = 8; | |
1348 | do { | |
1349 | bits++; | |
1350 | size >>= 1; | |
1351 | } while (size > 256); | |
1352 | return bits; | |
1353 | } | |
1354 | ||
2befb9e3 | 1355 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1356 | { |
1357 | return bdev->bd_block_size; | |
1358 | } | |
1359 | ||
f3876930 | 1360 | static inline bool queue_flush_queueable(struct request_queue *q) |
1361 | { | |
1362 | return !q->flush_not_queueable; | |
1363 | } | |
1364 | ||
1da177e4 LT |
1365 | typedef struct {struct page *v;} Sector; |
1366 | ||
1367 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1368 | ||
1369 | static inline void put_dev_sector(Sector p) | |
1370 | { | |
1371 | page_cache_release(p.v); | |
1372 | } | |
1373 | ||
1374 | struct work_struct; | |
59c3d45e JA |
1375 | int kblockd_schedule_work(struct work_struct *work); |
1376 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1377 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1378 | |
9195291e | 1379 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1380 | /* |
1381 | * This should not be using sched_clock(). A real patch is in progress | |
1382 | * to fix this up, until that is in place we need to disable preemption | |
1383 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1384 | */ | |
9195291e DS |
1385 | static inline void set_start_time_ns(struct request *req) |
1386 | { | |
28f4197e | 1387 | preempt_disable(); |
9195291e | 1388 | req->start_time_ns = sched_clock(); |
28f4197e | 1389 | preempt_enable(); |
9195291e DS |
1390 | } |
1391 | ||
1392 | static inline void set_io_start_time_ns(struct request *req) | |
1393 | { | |
28f4197e | 1394 | preempt_disable(); |
9195291e | 1395 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1396 | preempt_enable(); |
9195291e | 1397 | } |
84c124da DS |
1398 | |
1399 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1400 | { | |
1401 | return req->start_time_ns; | |
1402 | } | |
1403 | ||
1404 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1405 | { | |
1406 | return req->io_start_time_ns; | |
1407 | } | |
9195291e DS |
1408 | #else |
1409 | static inline void set_start_time_ns(struct request *req) {} | |
1410 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1411 | static inline uint64_t rq_start_time_ns(struct request *req) |
1412 | { | |
1413 | return 0; | |
1414 | } | |
1415 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1416 | { | |
1417 | return 0; | |
1418 | } | |
9195291e DS |
1419 | #endif |
1420 | ||
1da177e4 LT |
1421 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1422 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1423 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1424 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1425 | ||
7ba1ba12 MP |
1426 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1427 | ||
8288f496 MP |
1428 | enum blk_integrity_flags { |
1429 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1430 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1431 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1432 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1433 | }; |
7ba1ba12 | 1434 | |
18593088 | 1435 | struct blk_integrity_iter { |
7ba1ba12 MP |
1436 | void *prot_buf; |
1437 | void *data_buf; | |
3be91c4a | 1438 | sector_t seed; |
7ba1ba12 | 1439 | unsigned int data_size; |
3be91c4a | 1440 | unsigned short interval; |
7ba1ba12 MP |
1441 | const char *disk_name; |
1442 | }; | |
1443 | ||
18593088 | 1444 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 MP |
1445 | |
1446 | struct blk_integrity { | |
18593088 MP |
1447 | integrity_processing_fn *generate_fn; |
1448 | integrity_processing_fn *verify_fn; | |
7ba1ba12 MP |
1449 | |
1450 | unsigned short flags; | |
1451 | unsigned short tuple_size; | |
3be91c4a | 1452 | unsigned short interval; |
7ba1ba12 MP |
1453 | unsigned short tag_size; |
1454 | ||
1455 | const char *name; | |
1456 | ||
1457 | struct kobject kobj; | |
1458 | }; | |
1459 | ||
a63a5cf8 | 1460 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1461 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1462 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1463 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1464 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1465 | struct scatterlist *); | |
1466 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1467 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1468 | struct request *); | |
1469 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1470 | struct bio *); | |
7ba1ba12 | 1471 | |
b04accc4 JA |
1472 | static inline |
1473 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1474 | { | |
1475 | return bdev->bd_disk->integrity; | |
1476 | } | |
1477 | ||
b02739b0 MP |
1478 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1479 | { | |
1480 | return disk->integrity; | |
1481 | } | |
1482 | ||
180b2f95 | 1483 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1484 | { |
180b2f95 | 1485 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1486 | } |
1487 | ||
13f05c8d MP |
1488 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1489 | unsigned int segs) | |
1490 | { | |
1491 | q->limits.max_integrity_segments = segs; | |
1492 | } | |
1493 | ||
1494 | static inline unsigned short | |
1495 | queue_max_integrity_segments(struct request_queue *q) | |
1496 | { | |
1497 | return q->limits.max_integrity_segments; | |
1498 | } | |
1499 | ||
7ba1ba12 MP |
1500 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1501 | ||
fd83240a SR |
1502 | struct bio; |
1503 | struct block_device; | |
1504 | struct gendisk; | |
1505 | struct blk_integrity; | |
1506 | ||
1507 | static inline int blk_integrity_rq(struct request *rq) | |
1508 | { | |
1509 | return 0; | |
1510 | } | |
1511 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1512 | struct bio *b) | |
1513 | { | |
1514 | return 0; | |
1515 | } | |
1516 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1517 | struct bio *b, | |
1518 | struct scatterlist *s) | |
1519 | { | |
1520 | return 0; | |
1521 | } | |
1522 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1523 | { | |
61a04e5b | 1524 | return NULL; |
fd83240a SR |
1525 | } |
1526 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1527 | { | |
1528 | return NULL; | |
1529 | } | |
1530 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1531 | { | |
1532 | return 0; | |
1533 | } | |
1534 | static inline int blk_integrity_register(struct gendisk *d, | |
1535 | struct blk_integrity *b) | |
1536 | { | |
1537 | return 0; | |
1538 | } | |
1539 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1540 | { | |
1541 | } | |
1542 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1543 | unsigned int segs) | |
1544 | { | |
1545 | } | |
1546 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1547 | { | |
1548 | return 0; | |
1549 | } | |
4eaf99be MP |
1550 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1551 | struct request *r1, | |
1552 | struct request *r2) | |
fd83240a | 1553 | { |
cb1a5ab6 | 1554 | return true; |
fd83240a | 1555 | } |
4eaf99be MP |
1556 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1557 | struct request *r, | |
1558 | struct bio *b) | |
fd83240a | 1559 | { |
cb1a5ab6 | 1560 | return true; |
fd83240a SR |
1561 | } |
1562 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1563 | { | |
1564 | return 0; | |
1565 | } | |
7ba1ba12 MP |
1566 | |
1567 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1568 | ||
08f85851 | 1569 | struct block_device_operations { |
d4430d62 | 1570 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1571 | void (*release) (struct gendisk *, fmode_t); |
47a191fd | 1572 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
d4430d62 AV |
1573 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1574 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
dd22f551 MW |
1575 | long (*direct_access)(struct block_device *, sector_t, |
1576 | void **, unsigned long *pfn, long size); | |
77ea887e TH |
1577 | unsigned int (*check_events) (struct gendisk *disk, |
1578 | unsigned int clearing); | |
1579 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1580 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1581 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1582 | int (*revalidate_disk) (struct gendisk *); |
1583 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1584 | /* this callback is with swap_lock and sometimes page table lock held */ |
1585 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1586 | struct module *owner; |
1587 | }; | |
1588 | ||
633a08b8 AV |
1589 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1590 | unsigned long); | |
47a191fd MW |
1591 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1592 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1593 | struct writeback_control *); | |
dd22f551 MW |
1594 | extern long bdev_direct_access(struct block_device *, sector_t, void **addr, |
1595 | unsigned long *pfn, long size); | |
9361401e | 1596 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1597 | |
1598 | struct block_device; | |
1599 | ||
9361401e DH |
1600 | /* |
1601 | * stubs for when the block layer is configured out | |
1602 | */ | |
1603 | #define buffer_heads_over_limit 0 | |
1604 | ||
9361401e DH |
1605 | static inline long nr_blockdev_pages(void) |
1606 | { | |
1607 | return 0; | |
1608 | } | |
1609 | ||
1f940bdf JA |
1610 | struct blk_plug { |
1611 | }; | |
1612 | ||
1613 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1614 | { |
1615 | } | |
1616 | ||
1f940bdf | 1617 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1618 | { |
1619 | } | |
1620 | ||
1f940bdf | 1621 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1622 | { |
1623 | } | |
1624 | ||
a237c1c5 JA |
1625 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1626 | { | |
1627 | } | |
1628 | ||
1629 | ||
73c10101 JA |
1630 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1631 | { | |
1632 | return false; | |
1633 | } | |
1634 | ||
ac13a829 FF |
1635 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1636 | sector_t *error_sector) | |
1637 | { | |
1638 | return 0; | |
1639 | } | |
1640 | ||
9361401e DH |
1641 | #endif /* CONFIG_BLOCK */ |
1642 | ||
1da177e4 | 1643 | #endif |