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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> | |
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> |
1da177e4 LT |
24 | |
25 | #include <asm/scatterlist.h> | |
26 | ||
de477254 | 27 | struct module; |
21b2f0c8 CH |
28 | struct scsi_ioctl_command; |
29 | ||
1da177e4 | 30 | struct request_queue; |
1da177e4 | 31 | struct elevator_queue; |
1da177e4 | 32 | struct request_pm_state; |
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; |
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 */ | |
76 | REQ_TYPE_SENSE, /* sense request */ | |
77 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
78 | REQ_TYPE_PM_RESUME, /* resume request */ | |
79 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 80 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
81 | /* |
82 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
83 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
84 | * private REQ_LB opcodes to differentiate what type of request this is | |
85 | */ | |
4aff5e23 | 86 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 87 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
88 | }; |
89 | ||
1da177e4 LT |
90 | #define BLK_MAX_CDB 16 |
91 | ||
92 | /* | |
63a71386 | 93 | * try to put the fields that are referenced together in the same cacheline. |
4d0d98b6 | 94 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
63a71386 | 95 | * as well! |
1da177e4 LT |
96 | */ |
97 | struct request { | |
320ae51f JA |
98 | union { |
99 | struct list_head queuelist; | |
100 | struct llist_node ll_list; | |
101 | }; | |
102 | union { | |
103 | struct call_single_data csd; | |
104 | struct work_struct mq_flush_data; | |
105 | }; | |
ff856bad | 106 | |
165125e1 | 107 | struct request_queue *q; |
320ae51f | 108 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 109 | |
5953316d | 110 | u64 cmd_flags; |
4aff5e23 | 111 | enum rq_cmd_type_bits cmd_type; |
242f9dcb | 112 | unsigned long atomic_flags; |
1da177e4 | 113 | |
181fdde3 RK |
114 | int cpu; |
115 | ||
a2dec7b3 | 116 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 117 | unsigned int __data_len; /* total data len */ |
181fdde3 | 118 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
119 | |
120 | struct bio *bio; | |
121 | struct bio *biotail; | |
122 | ||
9817064b | 123 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
124 | /* |
125 | * The rb_node is only used inside the io scheduler, requests | |
126 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 127 | * completion_data share space with the rb_node. |
e6a1c874 JA |
128 | */ |
129 | union { | |
130 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 131 | void *completion_data; |
e6a1c874 | 132 | }; |
9817064b | 133 | |
ff7d145f | 134 | /* |
7f1dc8a2 | 135 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
136 | * more they have to dynamically allocate it. Flush requests are |
137 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 138 | * space with the elevator data. |
ff7d145f | 139 | */ |
c186794d | 140 | union { |
a612fddf TH |
141 | struct { |
142 | struct io_cq *icq; | |
143 | void *priv[2]; | |
144 | } elv; | |
145 | ||
c186794d MS |
146 | struct { |
147 | unsigned int seq; | |
148 | struct list_head list; | |
4853abaa | 149 | rq_end_io_fn *saved_end_io; |
c186794d MS |
150 | } flush; |
151 | }; | |
ff7d145f | 152 | |
8f34ee75 | 153 | struct gendisk *rq_disk; |
09e099d4 | 154 | struct hd_struct *part; |
1da177e4 | 155 | unsigned long start_time; |
9195291e | 156 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 157 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
158 | unsigned long long start_time_ns; |
159 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
160 | #endif | |
1da177e4 LT |
161 | /* Number of scatter-gather DMA addr+len pairs after |
162 | * physical address coalescing is performed. | |
163 | */ | |
164 | unsigned short nr_phys_segments; | |
13f05c8d MP |
165 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
166 | unsigned short nr_integrity_segments; | |
167 | #endif | |
1da177e4 | 168 | |
8f34ee75 JA |
169 | unsigned short ioprio; |
170 | ||
731ec497 TH |
171 | void *special; /* opaque pointer available for LLD use */ |
172 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 173 | |
cdd60262 JA |
174 | int tag; |
175 | int errors; | |
176 | ||
1da177e4 LT |
177 | /* |
178 | * when request is used as a packet command carrier | |
179 | */ | |
d7e3c324 FT |
180 | unsigned char __cmd[BLK_MAX_CDB]; |
181 | unsigned char *cmd; | |
181fdde3 | 182 | unsigned short cmd_len; |
1da177e4 | 183 | |
7a85f889 | 184 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 185 | unsigned int sense_len; |
c3a4d78c | 186 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
187 | void *sense; |
188 | ||
242f9dcb JA |
189 | unsigned long deadline; |
190 | struct list_head timeout_list; | |
1da177e4 | 191 | unsigned int timeout; |
17e01f21 | 192 | int retries; |
1da177e4 | 193 | |
1da177e4 | 194 | /* |
c00895ab | 195 | * completion callback. |
1da177e4 LT |
196 | */ |
197 | rq_end_io_fn *end_io; | |
198 | void *end_io_data; | |
abae1fde FT |
199 | |
200 | /* for bidi */ | |
201 | struct request *next_rq; | |
1da177e4 LT |
202 | }; |
203 | ||
766ca442 FLVC |
204 | static inline unsigned short req_get_ioprio(struct request *req) |
205 | { | |
206 | return req->ioprio; | |
207 | } | |
208 | ||
1da177e4 | 209 | /* |
4aff5e23 | 210 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
211 | * requests. Some step values could eventually be made generic. |
212 | */ | |
213 | struct request_pm_state | |
214 | { | |
215 | /* PM state machine step value, currently driver specific */ | |
216 | int pm_step; | |
217 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
218 | u32 pm_state; | |
219 | void* data; /* for driver use */ | |
220 | }; | |
221 | ||
222 | #include <linux/elevator.h> | |
223 | ||
320ae51f JA |
224 | struct blk_queue_ctx; |
225 | ||
165125e1 | 226 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 227 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 228 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 229 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
230 | |
231 | struct bio_vec; | |
cc371e66 AK |
232 | struct bvec_merge_data { |
233 | struct block_device *bi_bdev; | |
234 | sector_t bi_sector; | |
235 | unsigned bi_size; | |
236 | unsigned long bi_rw; | |
237 | }; | |
238 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
239 | struct bio_vec *); | |
ff856bad | 240 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 241 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 242 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 243 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 244 | |
242f9dcb JA |
245 | enum blk_eh_timer_return { |
246 | BLK_EH_NOT_HANDLED, | |
247 | BLK_EH_HANDLED, | |
248 | BLK_EH_RESET_TIMER, | |
249 | }; | |
250 | ||
251 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
252 | ||
1da177e4 LT |
253 | enum blk_queue_state { |
254 | Queue_down, | |
255 | Queue_up, | |
256 | }; | |
257 | ||
1da177e4 LT |
258 | struct blk_queue_tag { |
259 | struct request **tag_index; /* map of busy tags */ | |
260 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
261 | int busy; /* current depth */ |
262 | int max_depth; /* what we will send to device */ | |
ba025082 | 263 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
264 | atomic_t refcnt; /* map can be shared */ |
265 | }; | |
266 | ||
abf54393 FT |
267 | #define BLK_SCSI_MAX_CMDS (256) |
268 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
269 | ||
025146e1 MP |
270 | struct queue_limits { |
271 | unsigned long bounce_pfn; | |
272 | unsigned long seg_boundary_mask; | |
273 | ||
274 | unsigned int max_hw_sectors; | |
275 | unsigned int max_sectors; | |
276 | unsigned int max_segment_size; | |
c72758f3 MP |
277 | unsigned int physical_block_size; |
278 | unsigned int alignment_offset; | |
279 | unsigned int io_min; | |
280 | unsigned int io_opt; | |
67efc925 | 281 | unsigned int max_discard_sectors; |
4363ac7c | 282 | unsigned int max_write_same_sectors; |
86b37281 MP |
283 | unsigned int discard_granularity; |
284 | unsigned int discard_alignment; | |
025146e1 MP |
285 | |
286 | unsigned short logical_block_size; | |
8a78362c | 287 | unsigned short max_segments; |
13f05c8d | 288 | unsigned short max_integrity_segments; |
025146e1 | 289 | |
c72758f3 | 290 | unsigned char misaligned; |
86b37281 | 291 | unsigned char discard_misaligned; |
e692cb66 | 292 | unsigned char cluster; |
a934a00a | 293 | unsigned char discard_zeroes_data; |
025146e1 MP |
294 | }; |
295 | ||
d7b76301 | 296 | struct request_queue { |
1da177e4 LT |
297 | /* |
298 | * Together with queue_head for cacheline sharing | |
299 | */ | |
300 | struct list_head queue_head; | |
301 | struct request *last_merge; | |
b374d18a | 302 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
303 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
304 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
305 | |
306 | /* | |
a051661c TH |
307 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
308 | * is used, root blkg allocates from @q->root_rl and all other | |
309 | * blkgs from their own blkg->rl. Which one to use should be | |
310 | * determined using bio_request_list(). | |
1da177e4 | 311 | */ |
a051661c | 312 | struct request_list root_rl; |
1da177e4 LT |
313 | |
314 | request_fn_proc *request_fn; | |
1da177e4 LT |
315 | make_request_fn *make_request_fn; |
316 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 317 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 318 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 319 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 320 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 321 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 322 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 323 | |
320ae51f JA |
324 | struct blk_mq_ops *mq_ops; |
325 | ||
326 | unsigned int *mq_map; | |
327 | ||
328 | /* sw queues */ | |
329 | struct blk_mq_ctx *queue_ctx; | |
330 | unsigned int nr_queues; | |
331 | ||
332 | /* hw dispatch queues */ | |
333 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
334 | unsigned int nr_hw_queues; | |
335 | ||
8922e16c TH |
336 | /* |
337 | * Dispatch queue sorting | |
338 | */ | |
1b47f531 | 339 | sector_t end_sector; |
8922e16c | 340 | struct request *boundary_rq; |
8922e16c | 341 | |
1da177e4 | 342 | /* |
3cca6dc1 | 343 | * Delayed queue handling |
1da177e4 | 344 | */ |
3cca6dc1 | 345 | struct delayed_work delay_work; |
1da177e4 LT |
346 | |
347 | struct backing_dev_info backing_dev_info; | |
348 | ||
349 | /* | |
350 | * The queue owner gets to use this for whatever they like. | |
351 | * ll_rw_blk doesn't touch it. | |
352 | */ | |
353 | void *queuedata; | |
354 | ||
1da177e4 | 355 | /* |
d7b76301 | 356 | * various queue flags, see QUEUE_* below |
1da177e4 | 357 | */ |
d7b76301 | 358 | unsigned long queue_flags; |
1da177e4 | 359 | |
a73f730d TH |
360 | /* |
361 | * ida allocated id for this queue. Used to index queues from | |
362 | * ioctx. | |
363 | */ | |
364 | int id; | |
365 | ||
1da177e4 | 366 | /* |
d7b76301 | 367 | * queue needs bounce pages for pages above this limit |
1da177e4 | 368 | */ |
d7b76301 | 369 | gfp_t bounce_gfp; |
1da177e4 LT |
370 | |
371 | /* | |
152587de | 372 | * protects queue structures from reentrancy. ->__queue_lock should |
373 | * _never_ be used directly, it is queue private. always use | |
374 | * ->queue_lock. | |
1da177e4 | 375 | */ |
152587de | 376 | spinlock_t __queue_lock; |
1da177e4 LT |
377 | spinlock_t *queue_lock; |
378 | ||
379 | /* | |
380 | * queue kobject | |
381 | */ | |
382 | struct kobject kobj; | |
383 | ||
320ae51f JA |
384 | /* |
385 | * mq queue kobject | |
386 | */ | |
387 | struct kobject mq_kobj; | |
388 | ||
6c954667 LM |
389 | #ifdef CONFIG_PM_RUNTIME |
390 | struct device *dev; | |
391 | int rpm_status; | |
392 | unsigned int nr_pending; | |
393 | #endif | |
394 | ||
1da177e4 LT |
395 | /* |
396 | * queue settings | |
397 | */ | |
398 | unsigned long nr_requests; /* Max # of requests */ | |
399 | unsigned int nr_congestion_on; | |
400 | unsigned int nr_congestion_off; | |
401 | unsigned int nr_batching; | |
402 | ||
fa0ccd83 | 403 | unsigned int dma_drain_size; |
d7b76301 | 404 | void *dma_drain_buffer; |
e3790c7d | 405 | unsigned int dma_pad_mask; |
1da177e4 LT |
406 | unsigned int dma_alignment; |
407 | ||
408 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 409 | struct list_head tag_busy_list; |
1da177e4 | 410 | |
15853af9 | 411 | unsigned int nr_sorted; |
0a7ae2ff | 412 | unsigned int in_flight[2]; |
24faf6f6 BVA |
413 | /* |
414 | * Number of active block driver functions for which blk_drain_queue() | |
415 | * must wait. Must be incremented around functions that unlock the | |
416 | * queue_lock internally, e.g. scsi_request_fn(). | |
417 | */ | |
418 | unsigned int request_fn_active; | |
1da177e4 | 419 | |
242f9dcb JA |
420 | unsigned int rq_timeout; |
421 | struct timer_list timeout; | |
422 | struct list_head timeout_list; | |
423 | ||
a612fddf | 424 | struct list_head icq_list; |
4eef3049 | 425 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 426 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 427 | struct blkcg_gq *root_blkg; |
03aa264a | 428 | struct list_head blkg_list; |
4eef3049 | 429 | #endif |
a612fddf | 430 | |
025146e1 MP |
431 | struct queue_limits limits; |
432 | ||
1da177e4 LT |
433 | /* |
434 | * sg stuff | |
435 | */ | |
436 | unsigned int sg_timeout; | |
437 | unsigned int sg_reserved_size; | |
1946089a | 438 | int node; |
6c5c9341 | 439 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 440 | struct blk_trace *blk_trace; |
6c5c9341 | 441 | #endif |
1da177e4 | 442 | /* |
4913efe4 | 443 | * for flush operations |
1da177e4 | 444 | */ |
4913efe4 | 445 | unsigned int flush_flags; |
f3876930 | 446 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 447 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
448 | unsigned int flush_pending_idx:1; |
449 | unsigned int flush_running_idx:1; | |
450 | unsigned long flush_pending_since; | |
451 | struct list_head flush_queue[2]; | |
452 | struct list_head flush_data_in_flight; | |
320ae51f JA |
453 | union { |
454 | struct request flush_rq; | |
455 | struct { | |
456 | spinlock_t mq_flush_lock; | |
457 | struct work_struct mq_flush_work; | |
458 | }; | |
459 | }; | |
483f4afc AV |
460 | |
461 | struct mutex sysfs_lock; | |
d351af01 | 462 | |
d732580b TH |
463 | int bypass_depth; |
464 | ||
d351af01 | 465 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
466 | bsg_job_fn *bsg_job_fn; |
467 | int bsg_job_size; | |
d351af01 FT |
468 | struct bsg_class_device bsg_dev; |
469 | #endif | |
e43473b7 VG |
470 | |
471 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
472 | /* Throttle data */ | |
473 | struct throtl_data *td; | |
474 | #endif | |
548bc8e1 | 475 | struct rcu_head rcu_head; |
320ae51f JA |
476 | wait_queue_head_t mq_freeze_wq; |
477 | struct percpu_counter mq_usage_counter; | |
478 | struct list_head all_q_node; | |
1da177e4 LT |
479 | }; |
480 | ||
1da177e4 LT |
481 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
482 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
483 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
484 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 485 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 486 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
487 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
488 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 489 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
490 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
491 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
492 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 493 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
494 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
495 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
496 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
497 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
498 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 499 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 500 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 501 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
bc58ba94 JA |
502 | |
503 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 504 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
505 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
506 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 507 | |
8bcb6c7d | 508 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 509 | { |
8bcb6c7d AK |
510 | if (q->queue_lock) |
511 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
512 | } |
513 | ||
75ad23bc NP |
514 | static inline void queue_flag_set_unlocked(unsigned int flag, |
515 | struct request_queue *q) | |
516 | { | |
517 | __set_bit(flag, &q->queue_flags); | |
518 | } | |
519 | ||
e48ec690 JA |
520 | static inline int queue_flag_test_and_clear(unsigned int flag, |
521 | struct request_queue *q) | |
522 | { | |
8bcb6c7d | 523 | queue_lockdep_assert_held(q); |
e48ec690 JA |
524 | |
525 | if (test_bit(flag, &q->queue_flags)) { | |
526 | __clear_bit(flag, &q->queue_flags); | |
527 | return 1; | |
528 | } | |
529 | ||
530 | return 0; | |
531 | } | |
532 | ||
533 | static inline int queue_flag_test_and_set(unsigned int flag, | |
534 | struct request_queue *q) | |
535 | { | |
8bcb6c7d | 536 | queue_lockdep_assert_held(q); |
e48ec690 JA |
537 | |
538 | if (!test_bit(flag, &q->queue_flags)) { | |
539 | __set_bit(flag, &q->queue_flags); | |
540 | return 0; | |
541 | } | |
542 | ||
543 | return 1; | |
544 | } | |
545 | ||
75ad23bc NP |
546 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
547 | { | |
8bcb6c7d | 548 | queue_lockdep_assert_held(q); |
75ad23bc NP |
549 | __set_bit(flag, &q->queue_flags); |
550 | } | |
551 | ||
552 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
553 | struct request_queue *q) | |
554 | { | |
555 | __clear_bit(flag, &q->queue_flags); | |
556 | } | |
557 | ||
0a7ae2ff JA |
558 | static inline int queue_in_flight(struct request_queue *q) |
559 | { | |
560 | return q->in_flight[0] + q->in_flight[1]; | |
561 | } | |
562 | ||
75ad23bc NP |
563 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
564 | { | |
8bcb6c7d | 565 | queue_lockdep_assert_held(q); |
75ad23bc NP |
566 | __clear_bit(flag, &q->queue_flags); |
567 | } | |
568 | ||
1da177e4 LT |
569 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
570 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 571 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 572 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 573 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 574 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 575 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
576 | #define blk_queue_noxmerges(q) \ |
577 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 578 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 579 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 580 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
581 | #define blk_queue_stackable(q) \ |
582 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 583 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
584 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
585 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 586 | |
33659ebb CH |
587 | #define blk_noretry_request(rq) \ |
588 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
589 | REQ_FAILFAST_DRIVER)) | |
590 | ||
591 | #define blk_account_rq(rq) \ | |
592 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 593 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 594 | |
1da177e4 | 595 | #define blk_pm_request(rq) \ |
33659ebb CH |
596 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
597 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 598 | |
ab780f1e | 599 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 600 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
601 | /* rq->queuelist of dequeued request must be list_empty() */ |
602 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
603 | |
604 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
605 | ||
5953316d | 606 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 607 | |
e692cb66 MP |
608 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
609 | { | |
610 | return q->limits.cluster; | |
611 | } | |
612 | ||
9e2585a8 | 613 | /* |
1faa16d2 | 614 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 615 | */ |
1faa16d2 JA |
616 | static inline bool rw_is_sync(unsigned int rw_flags) |
617 | { | |
7b6d91da | 618 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
619 | } |
620 | ||
621 | static inline bool rq_is_sync(struct request *rq) | |
622 | { | |
623 | return rw_is_sync(rq->cmd_flags); | |
624 | } | |
625 | ||
5b788ce3 | 626 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 627 | { |
5b788ce3 TH |
628 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
629 | ||
630 | return rl->flags & flag; | |
1da177e4 LT |
631 | } |
632 | ||
5b788ce3 | 633 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 634 | { |
5b788ce3 TH |
635 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
636 | ||
637 | rl->flags |= flag; | |
1da177e4 LT |
638 | } |
639 | ||
5b788ce3 | 640 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 641 | { |
5b788ce3 TH |
642 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
643 | ||
644 | rl->flags &= ~flag; | |
1da177e4 LT |
645 | } |
646 | ||
e2a60da7 MP |
647 | static inline bool rq_mergeable(struct request *rq) |
648 | { | |
649 | if (rq->cmd_type != REQ_TYPE_FS) | |
650 | return false; | |
1da177e4 | 651 | |
e2a60da7 MP |
652 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
653 | return false; | |
654 | ||
655 | return true; | |
656 | } | |
1da177e4 | 657 | |
f31dc1cd MP |
658 | static inline bool blk_check_merge_flags(unsigned int flags1, |
659 | unsigned int flags2) | |
660 | { | |
661 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
662 | return false; | |
663 | ||
664 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
665 | return false; | |
666 | ||
4363ac7c MP |
667 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
668 | return false; | |
669 | ||
f31dc1cd MP |
670 | return true; |
671 | } | |
672 | ||
4363ac7c MP |
673 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
674 | { | |
675 | if (bio_data(a) == bio_data(b)) | |
676 | return true; | |
677 | ||
678 | return false; | |
679 | } | |
680 | ||
1da177e4 LT |
681 | /* |
682 | * q->prep_rq_fn return values | |
683 | */ | |
684 | #define BLKPREP_OK 0 /* serve it */ | |
685 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
686 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
687 | ||
688 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
689 | ||
690 | /* | |
691 | * standard bounce addresses: | |
692 | * | |
693 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
694 | * BLK_BOUNCE_ANY : don't bounce anything | |
695 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
696 | */ | |
2472892a AK |
697 | |
698 | #if BITS_PER_LONG == 32 | |
1da177e4 | 699 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
700 | #else |
701 | #define BLK_BOUNCE_HIGH -1ULL | |
702 | #endif | |
703 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 704 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 705 | |
3d6392cf JA |
706 | /* |
707 | * default timeout for SG_IO if none specified | |
708 | */ | |
709 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 710 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 711 | |
2a7326b5 | 712 | #ifdef CONFIG_BOUNCE |
1da177e4 | 713 | extern int init_emergency_isa_pool(void); |
165125e1 | 714 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
715 | #else |
716 | static inline int init_emergency_isa_pool(void) | |
717 | { | |
718 | return 0; | |
719 | } | |
165125e1 | 720 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
721 | { |
722 | } | |
723 | #endif /* CONFIG_MMU */ | |
724 | ||
152e283f FT |
725 | struct rq_map_data { |
726 | struct page **pages; | |
727 | int page_order; | |
728 | int nr_entries; | |
56c451f4 | 729 | unsigned long offset; |
97ae77a1 | 730 | int null_mapped; |
ecb554a8 | 731 | int from_user; |
152e283f FT |
732 | }; |
733 | ||
5705f702 N |
734 | struct req_iterator { |
735 | int i; | |
736 | struct bio *bio; | |
737 | }; | |
738 | ||
739 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
740 | #define for_each_bio(_bio) \ |
741 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 742 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
743 | if ((rq->bio)) \ |
744 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
745 | ||
5705f702 N |
746 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
747 | __rq_for_each_bio(_iter.bio, _rq) \ | |
748 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
749 | ||
750 | #define rq_iter_last(rq, _iter) \ | |
751 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
752 | ||
2d4dc890 IL |
753 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
754 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
755 | #endif | |
756 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
757 | extern void rq_flush_dcache_pages(struct request *rq); | |
758 | #else | |
759 | static inline void rq_flush_dcache_pages(struct request *rq) | |
760 | { | |
761 | } | |
762 | #endif | |
763 | ||
1da177e4 LT |
764 | extern int blk_register_queue(struct gendisk *disk); |
765 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 766 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 767 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 768 | extern void blk_put_request(struct request *); |
165125e1 | 769 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 770 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
771 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
772 | gfp_t); | |
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); |
b0fd271d KU |
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 | |
5a7bbad2 | 795 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 796 | |
3fcfab16 AM |
797 | /* |
798 | * A queue has just exitted congestion. Note this in the global counter of | |
799 | * congested queues, and wake up anyone who was waiting for requests to be | |
800 | * put back. | |
801 | */ | |
8aa7e847 | 802 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 803 | { |
8aa7e847 | 804 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
805 | } |
806 | ||
807 | /* | |
808 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
809 | * state flags and increment the global gounter of congested queues. | |
810 | */ | |
8aa7e847 | 811 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 812 | { |
8aa7e847 | 813 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
814 | } |
815 | ||
165125e1 JA |
816 | extern void blk_start_queue(struct request_queue *q); |
817 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 818 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 819 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 820 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 821 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 822 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 823 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
824 | struct rq_map_data *, void __user *, unsigned long, |
825 | gfp_t); | |
8e5cfc45 | 826 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
827 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
828 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
829 | struct rq_map_data *, struct sg_iovec *, int, |
830 | unsigned int, gfp_t); | |
165125e1 | 831 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 832 | struct request *, int); |
165125e1 | 833 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 834 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 835 | |
165125e1 | 836 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
837 | { |
838 | return bdev->bd_disk->queue; | |
839 | } | |
840 | ||
5efccd17 | 841 | /* |
80a761fd TH |
842 | * blk_rq_pos() : the current sector |
843 | * blk_rq_bytes() : bytes left in the entire request | |
844 | * blk_rq_cur_bytes() : bytes left in the current segment | |
845 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
846 | * blk_rq_sectors() : sectors left in the entire request | |
847 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 848 | */ |
5b93629b TH |
849 | static inline sector_t blk_rq_pos(const struct request *rq) |
850 | { | |
a2dec7b3 | 851 | return rq->__sector; |
2e46e8b2 TH |
852 | } |
853 | ||
854 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
855 | { | |
a2dec7b3 | 856 | return rq->__data_len; |
5b93629b TH |
857 | } |
858 | ||
2e46e8b2 TH |
859 | static inline int blk_rq_cur_bytes(const struct request *rq) |
860 | { | |
861 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
862 | } | |
5efccd17 | 863 | |
80a761fd TH |
864 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
865 | ||
5b93629b TH |
866 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
867 | { | |
2e46e8b2 | 868 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
869 | } |
870 | ||
871 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
872 | { | |
2e46e8b2 | 873 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
874 | } |
875 | ||
f31dc1cd MP |
876 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
877 | unsigned int cmd_flags) | |
878 | { | |
879 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 880 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 881 | |
4363ac7c MP |
882 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
883 | return q->limits.max_write_same_sectors; | |
884 | ||
f31dc1cd MP |
885 | return q->limits.max_sectors; |
886 | } | |
887 | ||
888 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) | |
889 | { | |
890 | struct request_queue *q = rq->q; | |
891 | ||
892 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
893 | return q->limits.max_hw_sectors; | |
894 | ||
895 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
896 | } | |
897 | ||
75afb352 JN |
898 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
899 | { | |
900 | unsigned int nr_bios = 0; | |
901 | struct bio *bio; | |
902 | ||
903 | __rq_for_each_bio(bio, rq) | |
904 | nr_bios++; | |
905 | ||
906 | return nr_bios; | |
907 | } | |
908 | ||
9934c8c0 TH |
909 | /* |
910 | * Request issue related functions. | |
911 | */ | |
912 | extern struct request *blk_peek_request(struct request_queue *q); | |
913 | extern void blk_start_request(struct request *rq); | |
914 | extern struct request *blk_fetch_request(struct request_queue *q); | |
915 | ||
1da177e4 | 916 | /* |
2e60e022 TH |
917 | * Request completion related functions. |
918 | * | |
919 | * blk_update_request() completes given number of bytes and updates | |
920 | * the request without completing it. | |
921 | * | |
f06d9a2b TH |
922 | * blk_end_request() and friends. __blk_end_request() must be called |
923 | * with the request queue spinlock acquired. | |
1da177e4 LT |
924 | * |
925 | * Several drivers define their own end_request and call | |
3bcddeac KU |
926 | * blk_end_request() for parts of the original function. |
927 | * This prevents code duplication in drivers. | |
1da177e4 | 928 | */ |
2e60e022 TH |
929 | extern bool blk_update_request(struct request *rq, int error, |
930 | unsigned int nr_bytes); | |
b1f74493 FT |
931 | extern bool blk_end_request(struct request *rq, int error, |
932 | unsigned int nr_bytes); | |
933 | extern void blk_end_request_all(struct request *rq, int error); | |
934 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 935 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
936 | extern bool __blk_end_request(struct request *rq, int error, |
937 | unsigned int nr_bytes); | |
938 | extern void __blk_end_request_all(struct request *rq, int error); | |
939 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 940 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 941 | |
ff856bad | 942 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
943 | extern void __blk_complete_request(struct request *); |
944 | extern void blk_abort_request(struct request *); | |
28018c24 | 945 | extern void blk_unprep_request(struct request *); |
ff856bad | 946 | |
1da177e4 LT |
947 | /* |
948 | * Access functions for manipulating queue properties | |
949 | */ | |
165125e1 | 950 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 951 | spinlock_t *lock, int node_id); |
165125e1 | 952 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
953 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
954 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
955 | extern void blk_cleanup_queue(struct request_queue *); |
956 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
957 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 958 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 959 | extern void blk_queue_max_hw_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 *); |
85b9f66a AH |
1003 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
1004 | struct scatterlist *sglist); | |
1da177e4 | 1005 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1006 | extern long nr_blockdev_pages(void); |
1da177e4 | 1007 | |
09ac46c4 | 1008 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1009 | struct request_queue *blk_alloc_queue(gfp_t); |
1010 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1011 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 1012 | |
6c954667 LM |
1013 | /* |
1014 | * block layer runtime pm functions | |
1015 | */ | |
1016 | #ifdef CONFIG_PM_RUNTIME | |
1017 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); | |
1018 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1019 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1020 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1021 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1022 | #else | |
1023 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1024 | struct device *dev) {} | |
1025 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1026 | { | |
1027 | return -ENOSYS; | |
1028 | } | |
1029 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1030 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1031 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1032 | #endif | |
1033 | ||
316cc67d | 1034 | /* |
75df7136 SJ |
1035 | * blk_plug permits building a queue of related requests by holding the I/O |
1036 | * fragments for a short period. This allows merging of sequential requests | |
1037 | * into single larger request. As the requests are moved from a per-task list to | |
1038 | * the device's request_queue in a batch, this results in improved scalability | |
1039 | * as the lock contention for request_queue lock is reduced. | |
1040 | * | |
1041 | * It is ok not to disable preemption when adding the request to the plug list | |
1042 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1043 | * the plug list when the task sleeps by itself. For details, please see | |
1044 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1045 | */ |
73c10101 | 1046 | struct blk_plug { |
75df7136 SJ |
1047 | unsigned long magic; /* detect uninitialized use-cases */ |
1048 | struct list_head list; /* requests */ | |
320ae51f | 1049 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1050 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1051 | }; |
55c022bb SL |
1052 | #define BLK_MAX_REQUEST_COUNT 16 |
1053 | ||
9cbb1750 | 1054 | struct blk_plug_cb; |
74018dc3 | 1055 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1056 | struct blk_plug_cb { |
1057 | struct list_head list; | |
9cbb1750 N |
1058 | blk_plug_cb_fn callback; |
1059 | void *data; | |
048c9374 | 1060 | }; |
9cbb1750 N |
1061 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1062 | void *data, int size); | |
73c10101 JA |
1063 | extern void blk_start_plug(struct blk_plug *); |
1064 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1065 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1066 | |
1067 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1068 | { | |
1069 | struct blk_plug *plug = tsk->plug; | |
1070 | ||
a237c1c5 JA |
1071 | if (plug) |
1072 | blk_flush_plug_list(plug, false); | |
1073 | } | |
1074 | ||
1075 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1076 | { | |
1077 | struct blk_plug *plug = tsk->plug; | |
1078 | ||
88b996cd | 1079 | if (plug) |
f6603783 | 1080 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1081 | } |
1082 | ||
1083 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1084 | { | |
1085 | struct blk_plug *plug = tsk->plug; | |
1086 | ||
320ae51f JA |
1087 | return plug && |
1088 | (!list_empty(&plug->list) || | |
1089 | !list_empty(&plug->mq_list) || | |
1090 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1091 | } |
1092 | ||
1da177e4 LT |
1093 | /* |
1094 | * tag stuff | |
1095 | */ | |
4aff5e23 | 1096 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
1097 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1098 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1099 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1100 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1101 | extern void blk_queue_free_tags(struct request_queue *); | |
1102 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1103 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1104 | extern struct blk_queue_tag *blk_init_tags(int); |
1105 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1106 | |
f583f492 DS |
1107 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1108 | int tag) | |
1109 | { | |
1110 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1111 | return NULL; | |
1112 | return bqt->tag_index[tag]; | |
1113 | } | |
dd3932ed CH |
1114 | |
1115 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1116 | ||
1117 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1118 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1119 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1120 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1121 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1122 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 1123 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
1124 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1125 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1126 | { |
2cf6d26a CH |
1127 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1128 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1129 | gfp_mask, flags); | |
fb2dce86 | 1130 | } |
e6fa0be6 | 1131 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1132 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1133 | { |
1134 | return blkdev_issue_zeroout(sb->s_bdev, | |
1135 | block << (sb->s_blocksize_bits - 9), | |
1136 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1137 | gfp_mask); |
e6fa0be6 | 1138 | } |
1da177e4 | 1139 | |
018e0446 | 1140 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1141 | |
eb28d31b MP |
1142 | enum blk_default_limits { |
1143 | BLK_MAX_SEGMENTS = 128, | |
1144 | BLK_SAFE_MAX_SECTORS = 255, | |
1145 | BLK_DEF_MAX_SECTORS = 1024, | |
1146 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1147 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1148 | }; | |
0e435ac2 | 1149 | |
1da177e4 LT |
1150 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1151 | ||
ae03bf63 MP |
1152 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1153 | { | |
025146e1 | 1154 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1155 | } |
1156 | ||
1157 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1158 | { | |
025146e1 | 1159 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1160 | } |
1161 | ||
1162 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1163 | { | |
025146e1 | 1164 | return q->limits.max_sectors; |
ae03bf63 MP |
1165 | } |
1166 | ||
1167 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1168 | { | |
025146e1 | 1169 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1170 | } |
1171 | ||
8a78362c | 1172 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1173 | { |
8a78362c | 1174 | return q->limits.max_segments; |
ae03bf63 MP |
1175 | } |
1176 | ||
1177 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1178 | { | |
025146e1 | 1179 | return q->limits.max_segment_size; |
ae03bf63 MP |
1180 | } |
1181 | ||
e1defc4f | 1182 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1183 | { |
1184 | int retval = 512; | |
1185 | ||
025146e1 MP |
1186 | if (q && q->limits.logical_block_size) |
1187 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1188 | |
1189 | return retval; | |
1190 | } | |
1191 | ||
e1defc4f | 1192 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1193 | { |
e1defc4f | 1194 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1195 | } |
1196 | ||
c72758f3 MP |
1197 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1198 | { | |
1199 | return q->limits.physical_block_size; | |
1200 | } | |
1201 | ||
892b6f90 | 1202 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1203 | { |
1204 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1205 | } | |
1206 | ||
c72758f3 MP |
1207 | static inline unsigned int queue_io_min(struct request_queue *q) |
1208 | { | |
1209 | return q->limits.io_min; | |
1210 | } | |
1211 | ||
ac481c20 MP |
1212 | static inline int bdev_io_min(struct block_device *bdev) |
1213 | { | |
1214 | return queue_io_min(bdev_get_queue(bdev)); | |
1215 | } | |
1216 | ||
c72758f3 MP |
1217 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1218 | { | |
1219 | return q->limits.io_opt; | |
1220 | } | |
1221 | ||
ac481c20 MP |
1222 | static inline int bdev_io_opt(struct block_device *bdev) |
1223 | { | |
1224 | return queue_io_opt(bdev_get_queue(bdev)); | |
1225 | } | |
1226 | ||
c72758f3 MP |
1227 | static inline int queue_alignment_offset(struct request_queue *q) |
1228 | { | |
ac481c20 | 1229 | if (q->limits.misaligned) |
c72758f3 MP |
1230 | return -1; |
1231 | ||
ac481c20 | 1232 | return q->limits.alignment_offset; |
c72758f3 MP |
1233 | } |
1234 | ||
e03a72e1 | 1235 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1236 | { |
1237 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1238 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1239 | |
e03a72e1 MP |
1240 | return (granularity + lim->alignment_offset - alignment) |
1241 | & (granularity - 1); | |
c72758f3 MP |
1242 | } |
1243 | ||
ac481c20 MP |
1244 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1245 | { | |
1246 | struct request_queue *q = bdev_get_queue(bdev); | |
1247 | ||
1248 | if (q->limits.misaligned) | |
1249 | return -1; | |
1250 | ||
1251 | if (bdev != bdev->bd_contains) | |
1252 | return bdev->bd_part->alignment_offset; | |
1253 | ||
1254 | return q->limits.alignment_offset; | |
1255 | } | |
1256 | ||
86b37281 MP |
1257 | static inline int queue_discard_alignment(struct request_queue *q) |
1258 | { | |
1259 | if (q->limits.discard_misaligned) | |
1260 | return -1; | |
1261 | ||
1262 | return q->limits.discard_alignment; | |
1263 | } | |
1264 | ||
e03a72e1 | 1265 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1266 | { |
59771079 | 1267 | unsigned int alignment, granularity, offset; |
dd3d145d | 1268 | |
a934a00a MP |
1269 | if (!lim->max_discard_sectors) |
1270 | return 0; | |
1271 | ||
59771079 LT |
1272 | /* Why are these in bytes, not sectors? */ |
1273 | alignment = lim->discard_alignment >> 9; | |
1274 | granularity = lim->discard_granularity >> 9; | |
1275 | if (!granularity) | |
1276 | return 0; | |
1277 | ||
1278 | /* Offset of the partition start in 'granularity' sectors */ | |
1279 | offset = sector_div(sector, granularity); | |
1280 | ||
1281 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1282 | offset = (granularity + alignment - offset) % granularity; | |
1283 | ||
1284 | /* Turn it back into bytes, gaah */ | |
1285 | return offset << 9; | |
86b37281 MP |
1286 | } |
1287 | ||
c6e66634 PB |
1288 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1289 | { | |
1290 | struct request_queue *q = bdev_get_queue(bdev); | |
1291 | ||
1292 | if (bdev != bdev->bd_contains) | |
1293 | return bdev->bd_part->discard_alignment; | |
1294 | ||
1295 | return q->limits.discard_alignment; | |
1296 | } | |
1297 | ||
98262f27 MP |
1298 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1299 | { | |
a934a00a | 1300 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1301 | return 1; |
1302 | ||
1303 | return 0; | |
1304 | } | |
1305 | ||
1306 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1307 | { | |
1308 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1309 | } | |
1310 | ||
4363ac7c MP |
1311 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1312 | { | |
1313 | struct request_queue *q = bdev_get_queue(bdev); | |
1314 | ||
1315 | if (q) | |
1316 | return q->limits.max_write_same_sectors; | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
165125e1 | 1321 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1322 | { |
482eb689 | 1323 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1324 | } |
1325 | ||
14417799 | 1326 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1327 | unsigned int len) |
1328 | { | |
1329 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1330 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1331 | } |
1332 | ||
1da177e4 LT |
1333 | /* assumes size > 256 */ |
1334 | static inline unsigned int blksize_bits(unsigned int size) | |
1335 | { | |
1336 | unsigned int bits = 8; | |
1337 | do { | |
1338 | bits++; | |
1339 | size >>= 1; | |
1340 | } while (size > 256); | |
1341 | return bits; | |
1342 | } | |
1343 | ||
2befb9e3 | 1344 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1345 | { |
1346 | return bdev->bd_block_size; | |
1347 | } | |
1348 | ||
f3876930 | 1349 | static inline bool queue_flush_queueable(struct request_queue *q) |
1350 | { | |
1351 | return !q->flush_not_queueable; | |
1352 | } | |
1353 | ||
1da177e4 LT |
1354 | typedef struct {struct page *v;} Sector; |
1355 | ||
1356 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1357 | ||
1358 | static inline void put_dev_sector(Sector p) | |
1359 | { | |
1360 | page_cache_release(p.v); | |
1361 | } | |
1362 | ||
1363 | struct work_struct; | |
18887ad9 | 1364 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
320ae51f | 1365 | int kblockd_schedule_delayed_work(struct request_queue *q, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1366 | |
9195291e | 1367 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1368 | /* |
1369 | * This should not be using sched_clock(). A real patch is in progress | |
1370 | * to fix this up, until that is in place we need to disable preemption | |
1371 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1372 | */ | |
9195291e DS |
1373 | static inline void set_start_time_ns(struct request *req) |
1374 | { | |
28f4197e | 1375 | preempt_disable(); |
9195291e | 1376 | req->start_time_ns = sched_clock(); |
28f4197e | 1377 | preempt_enable(); |
9195291e DS |
1378 | } |
1379 | ||
1380 | static inline void set_io_start_time_ns(struct request *req) | |
1381 | { | |
28f4197e | 1382 | preempt_disable(); |
9195291e | 1383 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1384 | preempt_enable(); |
9195291e | 1385 | } |
84c124da DS |
1386 | |
1387 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1388 | { | |
1389 | return req->start_time_ns; | |
1390 | } | |
1391 | ||
1392 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1393 | { | |
1394 | return req->io_start_time_ns; | |
1395 | } | |
9195291e DS |
1396 | #else |
1397 | static inline void set_start_time_ns(struct request *req) {} | |
1398 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1399 | static inline uint64_t rq_start_time_ns(struct request *req) |
1400 | { | |
1401 | return 0; | |
1402 | } | |
1403 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1404 | { | |
1405 | return 0; | |
1406 | } | |
9195291e DS |
1407 | #endif |
1408 | ||
1da177e4 LT |
1409 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1410 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1411 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1412 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1413 | ||
7ba1ba12 MP |
1414 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1415 | ||
b24498d4 JA |
1416 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1417 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1418 | |
1419 | struct blk_integrity_exchg { | |
1420 | void *prot_buf; | |
1421 | void *data_buf; | |
1422 | sector_t sector; | |
1423 | unsigned int data_size; | |
1424 | unsigned short sector_size; | |
1425 | const char *disk_name; | |
1426 | }; | |
1427 | ||
1428 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1429 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1430 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1431 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1432 | ||
1433 | struct blk_integrity { | |
1434 | integrity_gen_fn *generate_fn; | |
1435 | integrity_vrfy_fn *verify_fn; | |
1436 | integrity_set_tag_fn *set_tag_fn; | |
1437 | integrity_get_tag_fn *get_tag_fn; | |
1438 | ||
1439 | unsigned short flags; | |
1440 | unsigned short tuple_size; | |
1441 | unsigned short sector_size; | |
1442 | unsigned short tag_size; | |
1443 | ||
1444 | const char *name; | |
1445 | ||
1446 | struct kobject kobj; | |
1447 | }; | |
1448 | ||
a63a5cf8 | 1449 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1450 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1451 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1452 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1453 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1454 | struct scatterlist *); | |
1455 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1456 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1457 | struct request *); | |
1458 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1459 | struct bio *); | |
7ba1ba12 | 1460 | |
b04accc4 JA |
1461 | static inline |
1462 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1463 | { | |
1464 | return bdev->bd_disk->integrity; | |
1465 | } | |
1466 | ||
b02739b0 MP |
1467 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1468 | { | |
1469 | return disk->integrity; | |
1470 | } | |
1471 | ||
7ba1ba12 MP |
1472 | static inline int blk_integrity_rq(struct request *rq) |
1473 | { | |
d442cc44 MP |
1474 | if (rq->bio == NULL) |
1475 | return 0; | |
1476 | ||
7ba1ba12 MP |
1477 | return bio_integrity(rq->bio); |
1478 | } | |
1479 | ||
13f05c8d MP |
1480 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1481 | unsigned int segs) | |
1482 | { | |
1483 | q->limits.max_integrity_segments = segs; | |
1484 | } | |
1485 | ||
1486 | static inline unsigned short | |
1487 | queue_max_integrity_segments(struct request_queue *q) | |
1488 | { | |
1489 | return q->limits.max_integrity_segments; | |
1490 | } | |
1491 | ||
7ba1ba12 MP |
1492 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1493 | ||
fd83240a SR |
1494 | struct bio; |
1495 | struct block_device; | |
1496 | struct gendisk; | |
1497 | struct blk_integrity; | |
1498 | ||
1499 | static inline int blk_integrity_rq(struct request *rq) | |
1500 | { | |
1501 | return 0; | |
1502 | } | |
1503 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1504 | struct bio *b) | |
1505 | { | |
1506 | return 0; | |
1507 | } | |
1508 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1509 | struct bio *b, | |
1510 | struct scatterlist *s) | |
1511 | { | |
1512 | return 0; | |
1513 | } | |
1514 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1515 | { | |
1516 | return 0; | |
1517 | } | |
1518 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1519 | { | |
1520 | return NULL; | |
1521 | } | |
1522 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1523 | { | |
1524 | return 0; | |
1525 | } | |
1526 | static inline int blk_integrity_register(struct gendisk *d, | |
1527 | struct blk_integrity *b) | |
1528 | { | |
1529 | return 0; | |
1530 | } | |
1531 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1532 | { | |
1533 | } | |
1534 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1535 | unsigned int segs) | |
1536 | { | |
1537 | } | |
1538 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1539 | { | |
1540 | return 0; | |
1541 | } | |
1542 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1543 | struct request *r1, | |
1544 | struct request *r2) | |
1545 | { | |
1546 | return 0; | |
1547 | } | |
1548 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1549 | struct request *r, | |
1550 | struct bio *b) | |
1551 | { | |
1552 | return 0; | |
1553 | } | |
1554 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1555 | { | |
1556 | return 0; | |
1557 | } | |
7ba1ba12 MP |
1558 | |
1559 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1560 | ||
08f85851 | 1561 | struct block_device_operations { |
d4430d62 | 1562 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1563 | void (*release) (struct gendisk *, fmode_t); |
d4430d62 AV |
1564 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1565 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1566 | int (*direct_access) (struct block_device *, sector_t, |
1567 | void **, unsigned long *); | |
77ea887e TH |
1568 | unsigned int (*check_events) (struct gendisk *disk, |
1569 | unsigned int clearing); | |
1570 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1571 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1572 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1573 | int (*revalidate_disk) (struct gendisk *); |
1574 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1575 | /* this callback is with swap_lock and sometimes page table lock held */ |
1576 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1577 | struct module *owner; |
1578 | }; | |
1579 | ||
633a08b8 AV |
1580 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1581 | unsigned long); | |
9361401e DH |
1582 | #else /* CONFIG_BLOCK */ |
1583 | /* | |
1584 | * stubs for when the block layer is configured out | |
1585 | */ | |
1586 | #define buffer_heads_over_limit 0 | |
1587 | ||
9361401e DH |
1588 | static inline long nr_blockdev_pages(void) |
1589 | { | |
1590 | return 0; | |
1591 | } | |
1592 | ||
1f940bdf JA |
1593 | struct blk_plug { |
1594 | }; | |
1595 | ||
1596 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1597 | { |
1598 | } | |
1599 | ||
1f940bdf | 1600 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1601 | { |
1602 | } | |
1603 | ||
1f940bdf | 1604 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1605 | { |
1606 | } | |
1607 | ||
a237c1c5 JA |
1608 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1609 | { | |
1610 | } | |
1611 | ||
1612 | ||
73c10101 JA |
1613 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1614 | { | |
1615 | return false; | |
1616 | } | |
1617 | ||
9361401e DH |
1618 | #endif /* CONFIG_BLOCK */ |
1619 | ||
1da177e4 | 1620 | #endif |