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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> | |
11 | #include <linux/timer.h> | |
12 | #include <linux/workqueue.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/backing-dev.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/mempool.h> | |
17 | #include <linux/bio.h> | |
1da177e4 | 18 | #include <linux/stringify.h> |
3e6053d7 | 19 | #include <linux/gfp.h> |
d351af01 | 20 | #include <linux/bsg.h> |
c7c22e4d | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | |
23 | #include <asm/scatterlist.h> | |
24 | ||
de477254 | 25 | struct module; |
21b2f0c8 CH |
26 | struct scsi_ioctl_command; |
27 | ||
1da177e4 | 28 | struct request_queue; |
1da177e4 | 29 | struct elevator_queue; |
1da177e4 | 30 | struct request_pm_state; |
2056a782 | 31 | struct blk_trace; |
3d6392cf JA |
32 | struct request; |
33 | struct sg_io_hdr; | |
aa387cc8 | 34 | struct bsg_job; |
3c798398 | 35 | struct blkcg_gq; |
1da177e4 LT |
36 | |
37 | #define BLKDEV_MIN_RQ 4 | |
38 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
39 | ||
8bd435b3 TH |
40 | /* |
41 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
42 | * Defined here to simplify include dependency. | |
43 | */ | |
44 | #define BLKCG_MAX_POLS 2 | |
45 | ||
1da177e4 | 46 | struct request; |
8ffdc655 | 47 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 48 | |
5b788ce3 TH |
49 | #define BLK_RL_SYNCFULL (1U << 0) |
50 | #define BLK_RL_ASYNCFULL (1U << 1) | |
51 | ||
1da177e4 | 52 | struct request_list { |
5b788ce3 | 53 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
54 | #ifdef CONFIG_BLK_CGROUP |
55 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
56 | #endif | |
1faa16d2 JA |
57 | /* |
58 | * count[], starved[], and wait[] are indexed by | |
59 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
60 | */ | |
8a5ecdd4 TH |
61 | int count[2]; |
62 | int starved[2]; | |
63 | mempool_t *rq_pool; | |
64 | wait_queue_head_t wait[2]; | |
5b788ce3 | 65 | unsigned int flags; |
1da177e4 LT |
66 | }; |
67 | ||
4aff5e23 JA |
68 | /* |
69 | * request command types | |
70 | */ | |
71 | enum rq_cmd_type_bits { | |
72 | REQ_TYPE_FS = 1, /* fs request */ | |
73 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
74 | REQ_TYPE_SENSE, /* sense request */ | |
75 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
76 | REQ_TYPE_PM_RESUME, /* resume request */ | |
77 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 78 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
79 | /* |
80 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
81 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
82 | * private REQ_LB opcodes to differentiate what type of request this is | |
83 | */ | |
4aff5e23 | 84 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 85 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
86 | }; |
87 | ||
1da177e4 LT |
88 | #define BLK_MAX_CDB 16 |
89 | ||
90 | /* | |
63a71386 | 91 | * try to put the fields that are referenced together in the same cacheline. |
4d0d98b6 | 92 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
63a71386 | 93 | * as well! |
1da177e4 LT |
94 | */ |
95 | struct request { | |
ff856bad | 96 | struct list_head queuelist; |
c7c22e4d | 97 | struct call_single_data csd; |
ff856bad | 98 | |
165125e1 | 99 | struct request_queue *q; |
e6a1c874 | 100 | |
4aff5e23 JA |
101 | unsigned int cmd_flags; |
102 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 103 | unsigned long atomic_flags; |
1da177e4 | 104 | |
181fdde3 RK |
105 | int cpu; |
106 | ||
a2dec7b3 | 107 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 108 | unsigned int __data_len; /* total data len */ |
181fdde3 | 109 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
110 | |
111 | struct bio *bio; | |
112 | struct bio *biotail; | |
113 | ||
9817064b | 114 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
115 | /* |
116 | * The rb_node is only used inside the io scheduler, requests | |
117 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 118 | * completion_data share space with the rb_node. |
e6a1c874 JA |
119 | */ |
120 | union { | |
121 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 122 | void *completion_data; |
e6a1c874 | 123 | }; |
9817064b | 124 | |
ff7d145f | 125 | /* |
7f1dc8a2 | 126 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
127 | * more they have to dynamically allocate it. Flush requests are |
128 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 129 | * space with the elevator data. |
ff7d145f | 130 | */ |
c186794d | 131 | union { |
a612fddf TH |
132 | struct { |
133 | struct io_cq *icq; | |
134 | void *priv[2]; | |
135 | } elv; | |
136 | ||
c186794d MS |
137 | struct { |
138 | unsigned int seq; | |
139 | struct list_head list; | |
4853abaa | 140 | rq_end_io_fn *saved_end_io; |
c186794d MS |
141 | } flush; |
142 | }; | |
ff7d145f | 143 | |
8f34ee75 | 144 | struct gendisk *rq_disk; |
09e099d4 | 145 | struct hd_struct *part; |
1da177e4 | 146 | unsigned long start_time; |
9195291e | 147 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 148 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
149 | unsigned long long start_time_ns; |
150 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
151 | #endif | |
1da177e4 LT |
152 | /* Number of scatter-gather DMA addr+len pairs after |
153 | * physical address coalescing is performed. | |
154 | */ | |
155 | unsigned short nr_phys_segments; | |
13f05c8d MP |
156 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
157 | unsigned short nr_integrity_segments; | |
158 | #endif | |
1da177e4 | 159 | |
8f34ee75 JA |
160 | unsigned short ioprio; |
161 | ||
181fdde3 RK |
162 | int ref_count; |
163 | ||
731ec497 TH |
164 | void *special; /* opaque pointer available for LLD use */ |
165 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 166 | |
cdd60262 JA |
167 | int tag; |
168 | int errors; | |
169 | ||
1da177e4 LT |
170 | /* |
171 | * when request is used as a packet command carrier | |
172 | */ | |
d7e3c324 FT |
173 | unsigned char __cmd[BLK_MAX_CDB]; |
174 | unsigned char *cmd; | |
181fdde3 | 175 | unsigned short cmd_len; |
1da177e4 | 176 | |
7a85f889 | 177 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 178 | unsigned int sense_len; |
c3a4d78c | 179 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
180 | void *sense; |
181 | ||
242f9dcb JA |
182 | unsigned long deadline; |
183 | struct list_head timeout_list; | |
1da177e4 | 184 | unsigned int timeout; |
17e01f21 | 185 | int retries; |
1da177e4 | 186 | |
1da177e4 | 187 | /* |
c00895ab | 188 | * completion callback. |
1da177e4 LT |
189 | */ |
190 | rq_end_io_fn *end_io; | |
191 | void *end_io_data; | |
abae1fde FT |
192 | |
193 | /* for bidi */ | |
194 | struct request *next_rq; | |
1da177e4 LT |
195 | }; |
196 | ||
766ca442 FLVC |
197 | static inline unsigned short req_get_ioprio(struct request *req) |
198 | { | |
199 | return req->ioprio; | |
200 | } | |
201 | ||
1da177e4 | 202 | /* |
4aff5e23 | 203 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
204 | * requests. Some step values could eventually be made generic. |
205 | */ | |
206 | struct request_pm_state | |
207 | { | |
208 | /* PM state machine step value, currently driver specific */ | |
209 | int pm_step; | |
210 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
211 | u32 pm_state; | |
212 | void* data; /* for driver use */ | |
213 | }; | |
214 | ||
215 | #include <linux/elevator.h> | |
216 | ||
165125e1 | 217 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 218 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 219 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 220 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
221 | |
222 | struct bio_vec; | |
cc371e66 AK |
223 | struct bvec_merge_data { |
224 | struct block_device *bi_bdev; | |
225 | sector_t bi_sector; | |
226 | unsigned bi_size; | |
227 | unsigned long bi_rw; | |
228 | }; | |
229 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
230 | struct bio_vec *); | |
ff856bad | 231 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 232 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 233 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 234 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 235 | |
242f9dcb JA |
236 | enum blk_eh_timer_return { |
237 | BLK_EH_NOT_HANDLED, | |
238 | BLK_EH_HANDLED, | |
239 | BLK_EH_RESET_TIMER, | |
240 | }; | |
241 | ||
242 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
243 | ||
1da177e4 LT |
244 | enum blk_queue_state { |
245 | Queue_down, | |
246 | Queue_up, | |
247 | }; | |
248 | ||
1da177e4 LT |
249 | struct blk_queue_tag { |
250 | struct request **tag_index; /* map of busy tags */ | |
251 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
252 | int busy; /* current depth */ |
253 | int max_depth; /* what we will send to device */ | |
ba025082 | 254 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
255 | atomic_t refcnt; /* map can be shared */ |
256 | }; | |
257 | ||
abf54393 FT |
258 | #define BLK_SCSI_MAX_CMDS (256) |
259 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
260 | ||
025146e1 MP |
261 | struct queue_limits { |
262 | unsigned long bounce_pfn; | |
263 | unsigned long seg_boundary_mask; | |
264 | ||
265 | unsigned int max_hw_sectors; | |
266 | unsigned int max_sectors; | |
267 | unsigned int max_segment_size; | |
c72758f3 MP |
268 | unsigned int physical_block_size; |
269 | unsigned int alignment_offset; | |
270 | unsigned int io_min; | |
271 | unsigned int io_opt; | |
67efc925 | 272 | unsigned int max_discard_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; |
025146e1 MP |
284 | }; |
285 | ||
d7b76301 | 286 | struct request_queue { |
1da177e4 LT |
287 | /* |
288 | * Together with queue_head for cacheline sharing | |
289 | */ | |
290 | struct list_head queue_head; | |
291 | struct request *last_merge; | |
b374d18a | 292 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
293 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
294 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
295 | |
296 | /* | |
a051661c TH |
297 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
298 | * is used, root blkg allocates from @q->root_rl and all other | |
299 | * blkgs from their own blkg->rl. Which one to use should be | |
300 | * determined using bio_request_list(). | |
1da177e4 | 301 | */ |
a051661c | 302 | struct request_list root_rl; |
1da177e4 LT |
303 | |
304 | request_fn_proc *request_fn; | |
1da177e4 LT |
305 | make_request_fn *make_request_fn; |
306 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 307 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 308 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 309 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 310 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 311 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 312 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 313 | |
8922e16c TH |
314 | /* |
315 | * Dispatch queue sorting | |
316 | */ | |
1b47f531 | 317 | sector_t end_sector; |
8922e16c | 318 | struct request *boundary_rq; |
8922e16c | 319 | |
1da177e4 | 320 | /* |
3cca6dc1 | 321 | * Delayed queue handling |
1da177e4 | 322 | */ |
3cca6dc1 | 323 | struct delayed_work delay_work; |
1da177e4 LT |
324 | |
325 | struct backing_dev_info backing_dev_info; | |
326 | ||
327 | /* | |
328 | * The queue owner gets to use this for whatever they like. | |
329 | * ll_rw_blk doesn't touch it. | |
330 | */ | |
331 | void *queuedata; | |
332 | ||
1da177e4 | 333 | /* |
d7b76301 | 334 | * various queue flags, see QUEUE_* below |
1da177e4 | 335 | */ |
d7b76301 | 336 | unsigned long queue_flags; |
1da177e4 | 337 | |
a73f730d TH |
338 | /* |
339 | * ida allocated id for this queue. Used to index queues from | |
340 | * ioctx. | |
341 | */ | |
342 | int id; | |
343 | ||
1da177e4 | 344 | /* |
d7b76301 | 345 | * queue needs bounce pages for pages above this limit |
1da177e4 | 346 | */ |
d7b76301 | 347 | gfp_t bounce_gfp; |
1da177e4 LT |
348 | |
349 | /* | |
152587de | 350 | * protects queue structures from reentrancy. ->__queue_lock should |
351 | * _never_ be used directly, it is queue private. always use | |
352 | * ->queue_lock. | |
1da177e4 | 353 | */ |
152587de | 354 | spinlock_t __queue_lock; |
1da177e4 LT |
355 | spinlock_t *queue_lock; |
356 | ||
357 | /* | |
358 | * queue kobject | |
359 | */ | |
360 | struct kobject kobj; | |
361 | ||
362 | /* | |
363 | * queue settings | |
364 | */ | |
365 | unsigned long nr_requests; /* Max # of requests */ | |
366 | unsigned int nr_congestion_on; | |
367 | unsigned int nr_congestion_off; | |
368 | unsigned int nr_batching; | |
369 | ||
fa0ccd83 | 370 | unsigned int dma_drain_size; |
d7b76301 | 371 | void *dma_drain_buffer; |
e3790c7d | 372 | unsigned int dma_pad_mask; |
1da177e4 LT |
373 | unsigned int dma_alignment; |
374 | ||
375 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 376 | struct list_head tag_busy_list; |
1da177e4 | 377 | |
15853af9 | 378 | unsigned int nr_sorted; |
0a7ae2ff | 379 | unsigned int in_flight[2]; |
1da177e4 | 380 | |
242f9dcb JA |
381 | unsigned int rq_timeout; |
382 | struct timer_list timeout; | |
383 | struct list_head timeout_list; | |
384 | ||
a612fddf | 385 | struct list_head icq_list; |
4eef3049 | 386 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 387 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 388 | struct blkcg_gq *root_blkg; |
03aa264a | 389 | struct list_head blkg_list; |
4eef3049 | 390 | #endif |
a612fddf | 391 | |
025146e1 MP |
392 | struct queue_limits limits; |
393 | ||
1da177e4 LT |
394 | /* |
395 | * sg stuff | |
396 | */ | |
397 | unsigned int sg_timeout; | |
398 | unsigned int sg_reserved_size; | |
1946089a | 399 | int node; |
6c5c9341 | 400 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 401 | struct blk_trace *blk_trace; |
6c5c9341 | 402 | #endif |
1da177e4 | 403 | /* |
4913efe4 | 404 | * for flush operations |
1da177e4 | 405 | */ |
4913efe4 | 406 | unsigned int flush_flags; |
f3876930 | 407 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 408 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
409 | unsigned int flush_pending_idx:1; |
410 | unsigned int flush_running_idx:1; | |
411 | unsigned long flush_pending_since; | |
412 | struct list_head flush_queue[2]; | |
413 | struct list_head flush_data_in_flight; | |
dd4c133f | 414 | struct request flush_rq; |
483f4afc AV |
415 | |
416 | struct mutex sysfs_lock; | |
d351af01 | 417 | |
d732580b TH |
418 | int bypass_depth; |
419 | ||
d351af01 | 420 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
421 | bsg_job_fn *bsg_job_fn; |
422 | int bsg_job_size; | |
d351af01 FT |
423 | struct bsg_class_device bsg_dev; |
424 | #endif | |
e43473b7 | 425 | |
923adde1 TH |
426 | #ifdef CONFIG_BLK_CGROUP |
427 | struct list_head all_q_node; | |
428 | #endif | |
e43473b7 VG |
429 | #ifdef CONFIG_BLK_DEV_THROTTLING |
430 | /* Throttle data */ | |
431 | struct throtl_data *td; | |
432 | #endif | |
1da177e4 LT |
433 | }; |
434 | ||
1da177e4 LT |
435 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
436 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
437 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
438 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 | 439 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
d732580b | 440 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
441 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
442 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 443 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
444 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
445 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
446 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 447 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
448 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
449 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
450 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
451 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
452 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 453 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
bc58ba94 JA |
454 | |
455 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 456 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
457 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
458 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 459 | |
8bcb6c7d | 460 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 461 | { |
8bcb6c7d AK |
462 | if (q->queue_lock) |
463 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
464 | } |
465 | ||
75ad23bc NP |
466 | static inline void queue_flag_set_unlocked(unsigned int flag, |
467 | struct request_queue *q) | |
468 | { | |
469 | __set_bit(flag, &q->queue_flags); | |
470 | } | |
471 | ||
e48ec690 JA |
472 | static inline int queue_flag_test_and_clear(unsigned int flag, |
473 | struct request_queue *q) | |
474 | { | |
8bcb6c7d | 475 | queue_lockdep_assert_held(q); |
e48ec690 JA |
476 | |
477 | if (test_bit(flag, &q->queue_flags)) { | |
478 | __clear_bit(flag, &q->queue_flags); | |
479 | return 1; | |
480 | } | |
481 | ||
482 | return 0; | |
483 | } | |
484 | ||
485 | static inline int queue_flag_test_and_set(unsigned int flag, | |
486 | struct request_queue *q) | |
487 | { | |
8bcb6c7d | 488 | queue_lockdep_assert_held(q); |
e48ec690 JA |
489 | |
490 | if (!test_bit(flag, &q->queue_flags)) { | |
491 | __set_bit(flag, &q->queue_flags); | |
492 | return 0; | |
493 | } | |
494 | ||
495 | return 1; | |
496 | } | |
497 | ||
75ad23bc NP |
498 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
499 | { | |
8bcb6c7d | 500 | queue_lockdep_assert_held(q); |
75ad23bc NP |
501 | __set_bit(flag, &q->queue_flags); |
502 | } | |
503 | ||
504 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
505 | struct request_queue *q) | |
506 | { | |
507 | __clear_bit(flag, &q->queue_flags); | |
508 | } | |
509 | ||
0a7ae2ff JA |
510 | static inline int queue_in_flight(struct request_queue *q) |
511 | { | |
512 | return q->in_flight[0] + q->in_flight[1]; | |
513 | } | |
514 | ||
75ad23bc NP |
515 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
516 | { | |
8bcb6c7d | 517 | queue_lockdep_assert_held(q); |
75ad23bc NP |
518 | __clear_bit(flag, &q->queue_flags); |
519 | } | |
520 | ||
1da177e4 LT |
521 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
522 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
34f6055c | 523 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 524 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
ac9fafa1 | 525 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
526 | #define blk_queue_noxmerges(q) \ |
527 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 528 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 529 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 530 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
531 | #define blk_queue_stackable(q) \ |
532 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 533 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
534 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
535 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 536 | |
33659ebb CH |
537 | #define blk_noretry_request(rq) \ |
538 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
539 | REQ_FAILFAST_DRIVER)) | |
540 | ||
541 | #define blk_account_rq(rq) \ | |
542 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
543 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
544 | ((rq)->cmd_flags & REQ_DISCARD))) | |
545 | ||
1da177e4 | 546 | #define blk_pm_request(rq) \ |
33659ebb CH |
547 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
548 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 549 | |
ab780f1e | 550 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 551 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
552 | /* rq->queuelist of dequeued request must be list_empty() */ |
553 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
554 | |
555 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
556 | ||
4aff5e23 | 557 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 558 | |
e692cb66 MP |
559 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
560 | { | |
561 | return q->limits.cluster; | |
562 | } | |
563 | ||
9e2585a8 | 564 | /* |
1faa16d2 | 565 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 566 | */ |
1faa16d2 JA |
567 | static inline bool rw_is_sync(unsigned int rw_flags) |
568 | { | |
7b6d91da | 569 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
570 | } |
571 | ||
572 | static inline bool rq_is_sync(struct request *rq) | |
573 | { | |
574 | return rw_is_sync(rq->cmd_flags); | |
575 | } | |
576 | ||
5b788ce3 | 577 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 578 | { |
5b788ce3 TH |
579 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
580 | ||
581 | return rl->flags & flag; | |
1da177e4 LT |
582 | } |
583 | ||
5b788ce3 | 584 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 585 | { |
5b788ce3 TH |
586 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
587 | ||
588 | rl->flags |= flag; | |
1da177e4 LT |
589 | } |
590 | ||
5b788ce3 | 591 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 592 | { |
5b788ce3 TH |
593 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
594 | ||
595 | rl->flags &= ~flag; | |
1da177e4 LT |
596 | } |
597 | ||
598 | ||
599 | /* | |
600 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
601 | * it already be started by driver. | |
602 | */ | |
603 | #define RQ_NOMERGE_FLAGS \ | |
276f0f5d | 604 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA | REQ_DISCARD) |
1da177e4 | 605 | #define rq_mergeable(rq) \ |
e17fc0a1 | 606 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
607 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
608 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 609 | |
1da177e4 LT |
610 | /* |
611 | * q->prep_rq_fn return values | |
612 | */ | |
613 | #define BLKPREP_OK 0 /* serve it */ | |
614 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
615 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
616 | ||
617 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
618 | ||
619 | /* | |
620 | * standard bounce addresses: | |
621 | * | |
622 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
623 | * BLK_BOUNCE_ANY : don't bounce anything | |
624 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
625 | */ | |
2472892a AK |
626 | |
627 | #if BITS_PER_LONG == 32 | |
1da177e4 | 628 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
629 | #else |
630 | #define BLK_BOUNCE_HIGH -1ULL | |
631 | #endif | |
632 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 633 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 634 | |
3d6392cf JA |
635 | /* |
636 | * default timeout for SG_IO if none specified | |
637 | */ | |
638 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 639 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 640 | |
2a7326b5 | 641 | #ifdef CONFIG_BOUNCE |
1da177e4 | 642 | extern int init_emergency_isa_pool(void); |
165125e1 | 643 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
644 | #else |
645 | static inline int init_emergency_isa_pool(void) | |
646 | { | |
647 | return 0; | |
648 | } | |
165125e1 | 649 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
650 | { |
651 | } | |
652 | #endif /* CONFIG_MMU */ | |
653 | ||
152e283f FT |
654 | struct rq_map_data { |
655 | struct page **pages; | |
656 | int page_order; | |
657 | int nr_entries; | |
56c451f4 | 658 | unsigned long offset; |
97ae77a1 | 659 | int null_mapped; |
ecb554a8 | 660 | int from_user; |
152e283f FT |
661 | }; |
662 | ||
5705f702 N |
663 | struct req_iterator { |
664 | int i; | |
665 | struct bio *bio; | |
666 | }; | |
667 | ||
668 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
669 | #define for_each_bio(_bio) \ |
670 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 671 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
672 | if ((rq->bio)) \ |
673 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
674 | ||
5705f702 N |
675 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
676 | __rq_for_each_bio(_iter.bio, _rq) \ | |
677 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
678 | ||
679 | #define rq_iter_last(rq, _iter) \ | |
680 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
681 | ||
2d4dc890 IL |
682 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
683 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
684 | #endif | |
685 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
686 | extern void rq_flush_dcache_pages(struct request *rq); | |
687 | #else | |
688 | static inline void rq_flush_dcache_pages(struct request *rq) | |
689 | { | |
690 | } | |
691 | #endif | |
692 | ||
1da177e4 LT |
693 | extern int blk_register_queue(struct gendisk *disk); |
694 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 695 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 696 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 697 | extern void blk_put_request(struct request *); |
165125e1 | 698 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 699 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
700 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
701 | gfp_t); | |
165125e1 | 702 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
703 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
704 | unsigned int len); | |
82124d60 | 705 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 706 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
707 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
708 | struct bio_set *bs, gfp_t gfp_mask, | |
709 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
710 | void *data); | |
711 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
712 | extern int blk_insert_cloned_request(struct request_queue *q, |
713 | struct request *rq); | |
3cca6dc1 | 714 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 715 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 716 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
717 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
718 | unsigned int, void __user *); | |
74f3c8af AV |
719 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
720 | unsigned int, void __user *); | |
e915e872 AV |
721 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
722 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 723 | |
5a7bbad2 | 724 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 725 | |
3fcfab16 AM |
726 | /* |
727 | * A queue has just exitted congestion. Note this in the global counter of | |
728 | * congested queues, and wake up anyone who was waiting for requests to be | |
729 | * put back. | |
730 | */ | |
8aa7e847 | 731 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 732 | { |
8aa7e847 | 733 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
734 | } |
735 | ||
736 | /* | |
737 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
738 | * state flags and increment the global gounter of congested queues. | |
739 | */ | |
8aa7e847 | 740 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 741 | { |
8aa7e847 | 742 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
743 | } |
744 | ||
165125e1 JA |
745 | extern void blk_start_queue(struct request_queue *q); |
746 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 747 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 748 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 749 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 750 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 751 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 752 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
753 | struct rq_map_data *, void __user *, unsigned long, |
754 | gfp_t); | |
8e5cfc45 | 755 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
756 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
757 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
758 | struct rq_map_data *, struct sg_iovec *, int, |
759 | unsigned int, gfp_t); | |
165125e1 | 760 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 761 | struct request *, int); |
165125e1 | 762 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 763 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 764 | |
165125e1 | 765 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
766 | { |
767 | return bdev->bd_disk->queue; | |
768 | } | |
769 | ||
5efccd17 | 770 | /* |
80a761fd TH |
771 | * blk_rq_pos() : the current sector |
772 | * blk_rq_bytes() : bytes left in the entire request | |
773 | * blk_rq_cur_bytes() : bytes left in the current segment | |
774 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
775 | * blk_rq_sectors() : sectors left in the entire request | |
776 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 777 | */ |
5b93629b TH |
778 | static inline sector_t blk_rq_pos(const struct request *rq) |
779 | { | |
a2dec7b3 | 780 | return rq->__sector; |
2e46e8b2 TH |
781 | } |
782 | ||
783 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
784 | { | |
a2dec7b3 | 785 | return rq->__data_len; |
5b93629b TH |
786 | } |
787 | ||
2e46e8b2 TH |
788 | static inline int blk_rq_cur_bytes(const struct request *rq) |
789 | { | |
790 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
791 | } | |
5efccd17 | 792 | |
80a761fd TH |
793 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
794 | ||
5b93629b TH |
795 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
796 | { | |
2e46e8b2 | 797 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
798 | } |
799 | ||
800 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
801 | { | |
2e46e8b2 | 802 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
803 | } |
804 | ||
9934c8c0 TH |
805 | /* |
806 | * Request issue related functions. | |
807 | */ | |
808 | extern struct request *blk_peek_request(struct request_queue *q); | |
809 | extern void blk_start_request(struct request *rq); | |
810 | extern struct request *blk_fetch_request(struct request_queue *q); | |
811 | ||
1da177e4 | 812 | /* |
2e60e022 TH |
813 | * Request completion related functions. |
814 | * | |
815 | * blk_update_request() completes given number of bytes and updates | |
816 | * the request without completing it. | |
817 | * | |
f06d9a2b TH |
818 | * blk_end_request() and friends. __blk_end_request() must be called |
819 | * with the request queue spinlock acquired. | |
1da177e4 LT |
820 | * |
821 | * Several drivers define their own end_request and call | |
3bcddeac KU |
822 | * blk_end_request() for parts of the original function. |
823 | * This prevents code duplication in drivers. | |
1da177e4 | 824 | */ |
2e60e022 TH |
825 | extern bool blk_update_request(struct request *rq, int error, |
826 | unsigned int nr_bytes); | |
b1f74493 FT |
827 | extern bool blk_end_request(struct request *rq, int error, |
828 | unsigned int nr_bytes); | |
829 | extern void blk_end_request_all(struct request *rq, int error); | |
830 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 831 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
832 | extern bool __blk_end_request(struct request *rq, int error, |
833 | unsigned int nr_bytes); | |
834 | extern void __blk_end_request_all(struct request *rq, int error); | |
835 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 836 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 837 | |
ff856bad | 838 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
839 | extern void __blk_complete_request(struct request *); |
840 | extern void blk_abort_request(struct request *); | |
28018c24 | 841 | extern void blk_unprep_request(struct request *); |
ff856bad | 842 | |
1da177e4 LT |
843 | /* |
844 | * Access functions for manipulating queue properties | |
845 | */ | |
165125e1 | 846 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 847 | spinlock_t *lock, int node_id); |
165125e1 | 848 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
849 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
850 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
851 | extern void blk_cleanup_queue(struct request_queue *); |
852 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
853 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 854 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 855 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 856 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 857 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
858 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
859 | unsigned int max_discard_sectors); | |
e1defc4f | 860 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 861 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
862 | extern void blk_queue_alignment_offset(struct request_queue *q, |
863 | unsigned int alignment); | |
7c958e32 | 864 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 865 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 866 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 867 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 868 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 869 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
870 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
871 | sector_t offset); | |
17be8c24 MP |
872 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
873 | sector_t offset); | |
c72758f3 MP |
874 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
875 | sector_t offset); | |
165125e1 | 876 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 877 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 878 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
879 | extern int blk_queue_dma_drain(struct request_queue *q, |
880 | dma_drain_needed_fn *dma_drain_needed, | |
881 | void *buf, unsigned int size); | |
ef9e3fac | 882 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
883 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
884 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 885 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
886 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
887 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 888 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 889 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
890 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
891 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 892 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 893 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 894 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 895 | |
165125e1 | 896 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
897 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
898 | struct scatterlist *sglist); | |
1da177e4 | 899 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 900 | extern long nr_blockdev_pages(void); |
1da177e4 | 901 | |
09ac46c4 | 902 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
903 | struct request_queue *blk_alloc_queue(gfp_t); |
904 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
905 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 906 | |
316cc67d | 907 | /* |
75df7136 SJ |
908 | * blk_plug permits building a queue of related requests by holding the I/O |
909 | * fragments for a short period. This allows merging of sequential requests | |
910 | * into single larger request. As the requests are moved from a per-task list to | |
911 | * the device's request_queue in a batch, this results in improved scalability | |
912 | * as the lock contention for request_queue lock is reduced. | |
913 | * | |
914 | * It is ok not to disable preemption when adding the request to the plug list | |
915 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
916 | * the plug list when the task sleeps by itself. For details, please see | |
917 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 918 | */ |
73c10101 | 919 | struct blk_plug { |
75df7136 SJ |
920 | unsigned long magic; /* detect uninitialized use-cases */ |
921 | struct list_head list; /* requests */ | |
922 | struct list_head cb_list; /* md requires an unplug callback */ | |
923 | unsigned int should_sort; /* list to be sorted before flushing? */ | |
73c10101 | 924 | }; |
55c022bb SL |
925 | #define BLK_MAX_REQUEST_COUNT 16 |
926 | ||
9cbb1750 | 927 | struct blk_plug_cb; |
74018dc3 | 928 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
929 | struct blk_plug_cb { |
930 | struct list_head list; | |
9cbb1750 N |
931 | blk_plug_cb_fn callback; |
932 | void *data; | |
048c9374 | 933 | }; |
9cbb1750 N |
934 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
935 | void *data, int size); | |
73c10101 JA |
936 | extern void blk_start_plug(struct blk_plug *); |
937 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 938 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
939 | |
940 | static inline void blk_flush_plug(struct task_struct *tsk) | |
941 | { | |
942 | struct blk_plug *plug = tsk->plug; | |
943 | ||
a237c1c5 JA |
944 | if (plug) |
945 | blk_flush_plug_list(plug, false); | |
946 | } | |
947 | ||
948 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
949 | { | |
950 | struct blk_plug *plug = tsk->plug; | |
951 | ||
88b996cd | 952 | if (plug) |
f6603783 | 953 | blk_flush_plug_list(plug, true); |
73c10101 JA |
954 | } |
955 | ||
956 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
957 | { | |
958 | struct blk_plug *plug = tsk->plug; | |
959 | ||
048c9374 | 960 | return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); |
73c10101 JA |
961 | } |
962 | ||
1da177e4 LT |
963 | /* |
964 | * tag stuff | |
965 | */ | |
4aff5e23 | 966 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
967 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
968 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
969 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
970 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
971 | extern void blk_queue_free_tags(struct request_queue *); | |
972 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
973 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
974 | extern struct blk_queue_tag *blk_init_tags(int); |
975 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 976 | |
f583f492 DS |
977 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
978 | int tag) | |
979 | { | |
980 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
981 | return NULL; | |
982 | return bqt->tag_index[tag]; | |
983 | } | |
dd3932ed CH |
984 | |
985 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
986 | ||
987 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
988 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
989 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 | 990 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 991 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
992 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
993 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 994 | { |
2cf6d26a CH |
995 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
996 | nr_blocks << (sb->s_blocksize_bits - 9), | |
997 | gfp_mask, flags); | |
fb2dce86 | 998 | } |
e6fa0be6 | 999 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1000 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1001 | { |
1002 | return blkdev_issue_zeroout(sb->s_bdev, | |
1003 | block << (sb->s_blocksize_bits - 9), | |
1004 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1005 | gfp_mask); |
e6fa0be6 | 1006 | } |
1da177e4 | 1007 | |
018e0446 | 1008 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1009 | |
eb28d31b MP |
1010 | enum blk_default_limits { |
1011 | BLK_MAX_SEGMENTS = 128, | |
1012 | BLK_SAFE_MAX_SECTORS = 255, | |
1013 | BLK_DEF_MAX_SECTORS = 1024, | |
1014 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1015 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1016 | }; | |
0e435ac2 | 1017 | |
1da177e4 LT |
1018 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1019 | ||
ae03bf63 MP |
1020 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1021 | { | |
025146e1 | 1022 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1023 | } |
1024 | ||
1025 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1026 | { | |
025146e1 | 1027 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1028 | } |
1029 | ||
1030 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1031 | { | |
025146e1 | 1032 | return q->limits.max_sectors; |
ae03bf63 MP |
1033 | } |
1034 | ||
1035 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1036 | { | |
025146e1 | 1037 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1038 | } |
1039 | ||
8a78362c | 1040 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1041 | { |
8a78362c | 1042 | return q->limits.max_segments; |
ae03bf63 MP |
1043 | } |
1044 | ||
1045 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1046 | { | |
025146e1 | 1047 | return q->limits.max_segment_size; |
ae03bf63 MP |
1048 | } |
1049 | ||
e1defc4f | 1050 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1051 | { |
1052 | int retval = 512; | |
1053 | ||
025146e1 MP |
1054 | if (q && q->limits.logical_block_size) |
1055 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1056 | |
1057 | return retval; | |
1058 | } | |
1059 | ||
e1defc4f | 1060 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1061 | { |
e1defc4f | 1062 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1063 | } |
1064 | ||
c72758f3 MP |
1065 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1066 | { | |
1067 | return q->limits.physical_block_size; | |
1068 | } | |
1069 | ||
892b6f90 | 1070 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1071 | { |
1072 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1073 | } | |
1074 | ||
c72758f3 MP |
1075 | static inline unsigned int queue_io_min(struct request_queue *q) |
1076 | { | |
1077 | return q->limits.io_min; | |
1078 | } | |
1079 | ||
ac481c20 MP |
1080 | static inline int bdev_io_min(struct block_device *bdev) |
1081 | { | |
1082 | return queue_io_min(bdev_get_queue(bdev)); | |
1083 | } | |
1084 | ||
c72758f3 MP |
1085 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1086 | { | |
1087 | return q->limits.io_opt; | |
1088 | } | |
1089 | ||
ac481c20 MP |
1090 | static inline int bdev_io_opt(struct block_device *bdev) |
1091 | { | |
1092 | return queue_io_opt(bdev_get_queue(bdev)); | |
1093 | } | |
1094 | ||
c72758f3 MP |
1095 | static inline int queue_alignment_offset(struct request_queue *q) |
1096 | { | |
ac481c20 | 1097 | if (q->limits.misaligned) |
c72758f3 MP |
1098 | return -1; |
1099 | ||
ac481c20 | 1100 | return q->limits.alignment_offset; |
c72758f3 MP |
1101 | } |
1102 | ||
e03a72e1 | 1103 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1104 | { |
1105 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1106 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1107 | |
e03a72e1 MP |
1108 | return (granularity + lim->alignment_offset - alignment) |
1109 | & (granularity - 1); | |
c72758f3 MP |
1110 | } |
1111 | ||
ac481c20 MP |
1112 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1113 | { | |
1114 | struct request_queue *q = bdev_get_queue(bdev); | |
1115 | ||
1116 | if (q->limits.misaligned) | |
1117 | return -1; | |
1118 | ||
1119 | if (bdev != bdev->bd_contains) | |
1120 | return bdev->bd_part->alignment_offset; | |
1121 | ||
1122 | return q->limits.alignment_offset; | |
1123 | } | |
1124 | ||
86b37281 MP |
1125 | static inline int queue_discard_alignment(struct request_queue *q) |
1126 | { | |
1127 | if (q->limits.discard_misaligned) | |
1128 | return -1; | |
1129 | ||
1130 | return q->limits.discard_alignment; | |
1131 | } | |
1132 | ||
e03a72e1 | 1133 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1134 | { |
dd3d145d MP |
1135 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1136 | ||
a934a00a MP |
1137 | if (!lim->max_discard_sectors) |
1138 | return 0; | |
1139 | ||
dd3d145d MP |
1140 | return (lim->discard_granularity + lim->discard_alignment - alignment) |
1141 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1142 | } |
1143 | ||
c6e66634 PB |
1144 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1145 | { | |
1146 | struct request_queue *q = bdev_get_queue(bdev); | |
1147 | ||
1148 | if (bdev != bdev->bd_contains) | |
1149 | return bdev->bd_part->discard_alignment; | |
1150 | ||
1151 | return q->limits.discard_alignment; | |
1152 | } | |
1153 | ||
98262f27 MP |
1154 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1155 | { | |
a934a00a | 1156 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1157 | return 1; |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1163 | { | |
1164 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1165 | } | |
1166 | ||
165125e1 | 1167 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1168 | { |
482eb689 | 1169 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1170 | } |
1171 | ||
14417799 | 1172 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1173 | unsigned int len) |
1174 | { | |
1175 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1176 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1177 | } |
1178 | ||
1da177e4 LT |
1179 | /* assumes size > 256 */ |
1180 | static inline unsigned int blksize_bits(unsigned int size) | |
1181 | { | |
1182 | unsigned int bits = 8; | |
1183 | do { | |
1184 | bits++; | |
1185 | size >>= 1; | |
1186 | } while (size > 256); | |
1187 | return bits; | |
1188 | } | |
1189 | ||
2befb9e3 | 1190 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1191 | { |
1192 | return bdev->bd_block_size; | |
1193 | } | |
1194 | ||
f3876930 | 1195 | static inline bool queue_flush_queueable(struct request_queue *q) |
1196 | { | |
1197 | return !q->flush_not_queueable; | |
1198 | } | |
1199 | ||
1da177e4 LT |
1200 | typedef struct {struct page *v;} Sector; |
1201 | ||
1202 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1203 | ||
1204 | static inline void put_dev_sector(Sector p) | |
1205 | { | |
1206 | page_cache_release(p.v); | |
1207 | } | |
1208 | ||
1209 | struct work_struct; | |
18887ad9 | 1210 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1211 | |
9195291e | 1212 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1213 | /* |
1214 | * This should not be using sched_clock(). A real patch is in progress | |
1215 | * to fix this up, until that is in place we need to disable preemption | |
1216 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1217 | */ | |
9195291e DS |
1218 | static inline void set_start_time_ns(struct request *req) |
1219 | { | |
28f4197e | 1220 | preempt_disable(); |
9195291e | 1221 | req->start_time_ns = sched_clock(); |
28f4197e | 1222 | preempt_enable(); |
9195291e DS |
1223 | } |
1224 | ||
1225 | static inline void set_io_start_time_ns(struct request *req) | |
1226 | { | |
28f4197e | 1227 | preempt_disable(); |
9195291e | 1228 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1229 | preempt_enable(); |
9195291e | 1230 | } |
84c124da DS |
1231 | |
1232 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1233 | { | |
1234 | return req->start_time_ns; | |
1235 | } | |
1236 | ||
1237 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1238 | { | |
1239 | return req->io_start_time_ns; | |
1240 | } | |
9195291e DS |
1241 | #else |
1242 | static inline void set_start_time_ns(struct request *req) {} | |
1243 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1244 | static inline uint64_t rq_start_time_ns(struct request *req) |
1245 | { | |
1246 | return 0; | |
1247 | } | |
1248 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1249 | { | |
1250 | return 0; | |
1251 | } | |
9195291e DS |
1252 | #endif |
1253 | ||
1da177e4 LT |
1254 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1255 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1256 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1257 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1258 | ||
7ba1ba12 MP |
1259 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1260 | ||
b24498d4 JA |
1261 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1262 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1263 | |
1264 | struct blk_integrity_exchg { | |
1265 | void *prot_buf; | |
1266 | void *data_buf; | |
1267 | sector_t sector; | |
1268 | unsigned int data_size; | |
1269 | unsigned short sector_size; | |
1270 | const char *disk_name; | |
1271 | }; | |
1272 | ||
1273 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1274 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1275 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1276 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1277 | ||
1278 | struct blk_integrity { | |
1279 | integrity_gen_fn *generate_fn; | |
1280 | integrity_vrfy_fn *verify_fn; | |
1281 | integrity_set_tag_fn *set_tag_fn; | |
1282 | integrity_get_tag_fn *get_tag_fn; | |
1283 | ||
1284 | unsigned short flags; | |
1285 | unsigned short tuple_size; | |
1286 | unsigned short sector_size; | |
1287 | unsigned short tag_size; | |
1288 | ||
1289 | const char *name; | |
1290 | ||
1291 | struct kobject kobj; | |
1292 | }; | |
1293 | ||
a63a5cf8 | 1294 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1295 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1296 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1297 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1298 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1299 | struct scatterlist *); | |
1300 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1301 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1302 | struct request *); | |
1303 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1304 | struct bio *); | |
7ba1ba12 | 1305 | |
b04accc4 JA |
1306 | static inline |
1307 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1308 | { | |
1309 | return bdev->bd_disk->integrity; | |
1310 | } | |
1311 | ||
b02739b0 MP |
1312 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1313 | { | |
1314 | return disk->integrity; | |
1315 | } | |
1316 | ||
7ba1ba12 MP |
1317 | static inline int blk_integrity_rq(struct request *rq) |
1318 | { | |
d442cc44 MP |
1319 | if (rq->bio == NULL) |
1320 | return 0; | |
1321 | ||
7ba1ba12 MP |
1322 | return bio_integrity(rq->bio); |
1323 | } | |
1324 | ||
13f05c8d MP |
1325 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1326 | unsigned int segs) | |
1327 | { | |
1328 | q->limits.max_integrity_segments = segs; | |
1329 | } | |
1330 | ||
1331 | static inline unsigned short | |
1332 | queue_max_integrity_segments(struct request_queue *q) | |
1333 | { | |
1334 | return q->limits.max_integrity_segments; | |
1335 | } | |
1336 | ||
7ba1ba12 MP |
1337 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1338 | ||
fd83240a SR |
1339 | struct bio; |
1340 | struct block_device; | |
1341 | struct gendisk; | |
1342 | struct blk_integrity; | |
1343 | ||
1344 | static inline int blk_integrity_rq(struct request *rq) | |
1345 | { | |
1346 | return 0; | |
1347 | } | |
1348 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1349 | struct bio *b) | |
1350 | { | |
1351 | return 0; | |
1352 | } | |
1353 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1354 | struct bio *b, | |
1355 | struct scatterlist *s) | |
1356 | { | |
1357 | return 0; | |
1358 | } | |
1359 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1360 | { | |
1361 | return 0; | |
1362 | } | |
1363 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1364 | { | |
1365 | return NULL; | |
1366 | } | |
1367 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1368 | { | |
1369 | return 0; | |
1370 | } | |
1371 | static inline int blk_integrity_register(struct gendisk *d, | |
1372 | struct blk_integrity *b) | |
1373 | { | |
1374 | return 0; | |
1375 | } | |
1376 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1377 | { | |
1378 | } | |
1379 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1380 | unsigned int segs) | |
1381 | { | |
1382 | } | |
1383 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1384 | { | |
1385 | return 0; | |
1386 | } | |
1387 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1388 | struct request *r1, | |
1389 | struct request *r2) | |
1390 | { | |
1391 | return 0; | |
1392 | } | |
1393 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1394 | struct request *r, | |
1395 | struct bio *b) | |
1396 | { | |
1397 | return 0; | |
1398 | } | |
1399 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1400 | { | |
1401 | return 0; | |
1402 | } | |
7ba1ba12 MP |
1403 | |
1404 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1405 | ||
08f85851 | 1406 | struct block_device_operations { |
d4430d62 AV |
1407 | int (*open) (struct block_device *, fmode_t); |
1408 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1409 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1410 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1411 | int (*direct_access) (struct block_device *, sector_t, |
1412 | void **, unsigned long *); | |
77ea887e TH |
1413 | unsigned int (*check_events) (struct gendisk *disk, |
1414 | unsigned int clearing); | |
1415 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1416 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1417 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1418 | int (*revalidate_disk) (struct gendisk *); |
1419 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1420 | /* this callback is with swap_lock and sometimes page table lock held */ |
1421 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1422 | struct module *owner; |
1423 | }; | |
1424 | ||
633a08b8 AV |
1425 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1426 | unsigned long); | |
9361401e DH |
1427 | #else /* CONFIG_BLOCK */ |
1428 | /* | |
1429 | * stubs for when the block layer is configured out | |
1430 | */ | |
1431 | #define buffer_heads_over_limit 0 | |
1432 | ||
9361401e DH |
1433 | static inline long nr_blockdev_pages(void) |
1434 | { | |
1435 | return 0; | |
1436 | } | |
1437 | ||
1f940bdf JA |
1438 | struct blk_plug { |
1439 | }; | |
1440 | ||
1441 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1442 | { |
1443 | } | |
1444 | ||
1f940bdf | 1445 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1446 | { |
1447 | } | |
1448 | ||
1f940bdf | 1449 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1450 | { |
1451 | } | |
1452 | ||
a237c1c5 JA |
1453 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1454 | { | |
1455 | } | |
1456 | ||
1457 | ||
73c10101 JA |
1458 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1459 | { | |
1460 | return false; | |
1461 | } | |
1462 | ||
9361401e DH |
1463 | #endif /* CONFIG_BLOCK */ |
1464 | ||
1da177e4 | 1465 | #endif |