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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> |
548bc8e1 | 22 | #include <linux/rcupdate.h> |
1da177e4 LT |
23 | |
24 | #include <asm/scatterlist.h> | |
25 | ||
de477254 | 26 | struct module; |
21b2f0c8 CH |
27 | struct scsi_ioctl_command; |
28 | ||
1da177e4 | 29 | struct request_queue; |
1da177e4 | 30 | struct elevator_queue; |
1da177e4 | 31 | struct request_pm_state; |
2056a782 | 32 | struct blk_trace; |
3d6392cf JA |
33 | struct request; |
34 | struct sg_io_hdr; | |
aa387cc8 | 35 | struct bsg_job; |
3c798398 | 36 | struct blkcg_gq; |
1da177e4 LT |
37 | |
38 | #define BLKDEV_MIN_RQ 4 | |
39 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
40 | ||
8bd435b3 TH |
41 | /* |
42 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
43 | * Defined here to simplify include dependency. | |
44 | */ | |
45 | #define BLKCG_MAX_POLS 2 | |
46 | ||
1da177e4 | 47 | struct request; |
8ffdc655 | 48 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 49 | |
5b788ce3 TH |
50 | #define BLK_RL_SYNCFULL (1U << 0) |
51 | #define BLK_RL_ASYNCFULL (1U << 1) | |
52 | ||
1da177e4 | 53 | struct request_list { |
5b788ce3 | 54 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
55 | #ifdef CONFIG_BLK_CGROUP |
56 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
57 | #endif | |
1faa16d2 JA |
58 | /* |
59 | * count[], starved[], and wait[] are indexed by | |
60 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
61 | */ | |
8a5ecdd4 TH |
62 | int count[2]; |
63 | int starved[2]; | |
64 | mempool_t *rq_pool; | |
65 | wait_queue_head_t wait[2]; | |
5b788ce3 | 66 | unsigned int flags; |
1da177e4 LT |
67 | }; |
68 | ||
4aff5e23 JA |
69 | /* |
70 | * request command types | |
71 | */ | |
72 | enum rq_cmd_type_bits { | |
73 | REQ_TYPE_FS = 1, /* fs request */ | |
74 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
75 | REQ_TYPE_SENSE, /* sense request */ | |
76 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
77 | REQ_TYPE_PM_RESUME, /* resume request */ | |
78 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 79 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
80 | /* |
81 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
82 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
83 | * private REQ_LB opcodes to differentiate what type of request this is | |
84 | */ | |
4aff5e23 | 85 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 86 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
87 | }; |
88 | ||
1da177e4 LT |
89 | #define BLK_MAX_CDB 16 |
90 | ||
91 | /* | |
63a71386 | 92 | * try to put the fields that are referenced together in the same cacheline. |
4d0d98b6 | 93 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
63a71386 | 94 | * as well! |
1da177e4 LT |
95 | */ |
96 | struct request { | |
ff856bad | 97 | struct list_head queuelist; |
c7c22e4d | 98 | struct call_single_data csd; |
ff856bad | 99 | |
165125e1 | 100 | struct request_queue *q; |
e6a1c874 | 101 | |
4aff5e23 JA |
102 | unsigned int cmd_flags; |
103 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 104 | unsigned long atomic_flags; |
1da177e4 | 105 | |
181fdde3 RK |
106 | int cpu; |
107 | ||
a2dec7b3 | 108 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 109 | unsigned int __data_len; /* total data len */ |
181fdde3 | 110 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
111 | |
112 | struct bio *bio; | |
113 | struct bio *biotail; | |
114 | ||
9817064b | 115 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
116 | /* |
117 | * The rb_node is only used inside the io scheduler, requests | |
118 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 119 | * completion_data share space with the rb_node. |
e6a1c874 JA |
120 | */ |
121 | union { | |
122 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 123 | void *completion_data; |
e6a1c874 | 124 | }; |
9817064b | 125 | |
ff7d145f | 126 | /* |
7f1dc8a2 | 127 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
128 | * more they have to dynamically allocate it. Flush requests are |
129 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 130 | * space with the elevator data. |
ff7d145f | 131 | */ |
c186794d | 132 | union { |
a612fddf TH |
133 | struct { |
134 | struct io_cq *icq; | |
135 | void *priv[2]; | |
136 | } elv; | |
137 | ||
c186794d MS |
138 | struct { |
139 | unsigned int seq; | |
140 | struct list_head list; | |
4853abaa | 141 | rq_end_io_fn *saved_end_io; |
c186794d MS |
142 | } flush; |
143 | }; | |
ff7d145f | 144 | |
8f34ee75 | 145 | struct gendisk *rq_disk; |
09e099d4 | 146 | struct hd_struct *part; |
1da177e4 | 147 | unsigned long start_time; |
9195291e | 148 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 149 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
150 | unsigned long long start_time_ns; |
151 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
152 | #endif | |
1da177e4 LT |
153 | /* Number of scatter-gather DMA addr+len pairs after |
154 | * physical address coalescing is performed. | |
155 | */ | |
156 | unsigned short nr_phys_segments; | |
13f05c8d MP |
157 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
158 | unsigned short nr_integrity_segments; | |
159 | #endif | |
1da177e4 | 160 | |
8f34ee75 JA |
161 | unsigned short ioprio; |
162 | ||
181fdde3 RK |
163 | int ref_count; |
164 | ||
731ec497 TH |
165 | void *special; /* opaque pointer available for LLD use */ |
166 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 167 | |
cdd60262 JA |
168 | int tag; |
169 | int errors; | |
170 | ||
1da177e4 LT |
171 | /* |
172 | * when request is used as a packet command carrier | |
173 | */ | |
d7e3c324 FT |
174 | unsigned char __cmd[BLK_MAX_CDB]; |
175 | unsigned char *cmd; | |
181fdde3 | 176 | unsigned short cmd_len; |
1da177e4 | 177 | |
7a85f889 | 178 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 179 | unsigned int sense_len; |
c3a4d78c | 180 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
181 | void *sense; |
182 | ||
242f9dcb JA |
183 | unsigned long deadline; |
184 | struct list_head timeout_list; | |
1da177e4 | 185 | unsigned int timeout; |
17e01f21 | 186 | int retries; |
1da177e4 | 187 | |
1da177e4 | 188 | /* |
c00895ab | 189 | * completion callback. |
1da177e4 LT |
190 | */ |
191 | rq_end_io_fn *end_io; | |
192 | void *end_io_data; | |
abae1fde FT |
193 | |
194 | /* for bidi */ | |
195 | struct request *next_rq; | |
1da177e4 LT |
196 | }; |
197 | ||
766ca442 FLVC |
198 | static inline unsigned short req_get_ioprio(struct request *req) |
199 | { | |
200 | return req->ioprio; | |
201 | } | |
202 | ||
1da177e4 | 203 | /* |
4aff5e23 | 204 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
205 | * requests. Some step values could eventually be made generic. |
206 | */ | |
207 | struct request_pm_state | |
208 | { | |
209 | /* PM state machine step value, currently driver specific */ | |
210 | int pm_step; | |
211 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
212 | u32 pm_state; | |
213 | void* data; /* for driver use */ | |
214 | }; | |
215 | ||
216 | #include <linux/elevator.h> | |
217 | ||
165125e1 | 218 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 219 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 220 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 221 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
222 | |
223 | struct bio_vec; | |
cc371e66 AK |
224 | struct bvec_merge_data { |
225 | struct block_device *bi_bdev; | |
226 | sector_t bi_sector; | |
227 | unsigned bi_size; | |
228 | unsigned long bi_rw; | |
229 | }; | |
230 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
231 | struct bio_vec *); | |
ff856bad | 232 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 233 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 234 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 235 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 236 | |
242f9dcb JA |
237 | enum blk_eh_timer_return { |
238 | BLK_EH_NOT_HANDLED, | |
239 | BLK_EH_HANDLED, | |
240 | BLK_EH_RESET_TIMER, | |
241 | }; | |
242 | ||
243 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
244 | ||
1da177e4 LT |
245 | enum blk_queue_state { |
246 | Queue_down, | |
247 | Queue_up, | |
248 | }; | |
249 | ||
1da177e4 LT |
250 | struct blk_queue_tag { |
251 | struct request **tag_index; /* map of busy tags */ | |
252 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
253 | int busy; /* current depth */ |
254 | int max_depth; /* what we will send to device */ | |
ba025082 | 255 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
256 | atomic_t refcnt; /* map can be shared */ |
257 | }; | |
258 | ||
abf54393 FT |
259 | #define BLK_SCSI_MAX_CMDS (256) |
260 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
261 | ||
025146e1 MP |
262 | struct queue_limits { |
263 | unsigned long bounce_pfn; | |
264 | unsigned long seg_boundary_mask; | |
265 | ||
266 | unsigned int max_hw_sectors; | |
267 | unsigned int max_sectors; | |
268 | unsigned int max_segment_size; | |
c72758f3 MP |
269 | unsigned int physical_block_size; |
270 | unsigned int alignment_offset; | |
271 | unsigned int io_min; | |
272 | unsigned int io_opt; | |
67efc925 | 273 | unsigned int max_discard_sectors; |
4363ac7c | 274 | unsigned int max_write_same_sectors; |
86b37281 MP |
275 | unsigned int discard_granularity; |
276 | unsigned int discard_alignment; | |
025146e1 MP |
277 | |
278 | unsigned short logical_block_size; | |
8a78362c | 279 | unsigned short max_segments; |
13f05c8d | 280 | unsigned short max_integrity_segments; |
025146e1 | 281 | |
c72758f3 | 282 | unsigned char misaligned; |
86b37281 | 283 | unsigned char discard_misaligned; |
e692cb66 | 284 | unsigned char cluster; |
a934a00a | 285 | unsigned char discard_zeroes_data; |
025146e1 MP |
286 | }; |
287 | ||
d7b76301 | 288 | struct request_queue { |
1da177e4 LT |
289 | /* |
290 | * Together with queue_head for cacheline sharing | |
291 | */ | |
292 | struct list_head queue_head; | |
293 | struct request *last_merge; | |
b374d18a | 294 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
295 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
296 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
297 | |
298 | /* | |
a051661c TH |
299 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
300 | * is used, root blkg allocates from @q->root_rl and all other | |
301 | * blkgs from their own blkg->rl. Which one to use should be | |
302 | * determined using bio_request_list(). | |
1da177e4 | 303 | */ |
a051661c | 304 | struct request_list root_rl; |
1da177e4 LT |
305 | |
306 | request_fn_proc *request_fn; | |
1da177e4 LT |
307 | make_request_fn *make_request_fn; |
308 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 309 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 310 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 311 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 312 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 313 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 314 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 315 | |
8922e16c TH |
316 | /* |
317 | * Dispatch queue sorting | |
318 | */ | |
1b47f531 | 319 | sector_t end_sector; |
8922e16c | 320 | struct request *boundary_rq; |
8922e16c | 321 | |
1da177e4 | 322 | /* |
3cca6dc1 | 323 | * Delayed queue handling |
1da177e4 | 324 | */ |
3cca6dc1 | 325 | struct delayed_work delay_work; |
1da177e4 LT |
326 | |
327 | struct backing_dev_info backing_dev_info; | |
328 | ||
329 | /* | |
330 | * The queue owner gets to use this for whatever they like. | |
331 | * ll_rw_blk doesn't touch it. | |
332 | */ | |
333 | void *queuedata; | |
334 | ||
1da177e4 | 335 | /* |
d7b76301 | 336 | * various queue flags, see QUEUE_* below |
1da177e4 | 337 | */ |
d7b76301 | 338 | unsigned long queue_flags; |
1da177e4 | 339 | |
a73f730d TH |
340 | /* |
341 | * ida allocated id for this queue. Used to index queues from | |
342 | * ioctx. | |
343 | */ | |
344 | int id; | |
345 | ||
1da177e4 | 346 | /* |
d7b76301 | 347 | * queue needs bounce pages for pages above this limit |
1da177e4 | 348 | */ |
d7b76301 | 349 | gfp_t bounce_gfp; |
1da177e4 LT |
350 | |
351 | /* | |
152587de | 352 | * protects queue structures from reentrancy. ->__queue_lock should |
353 | * _never_ be used directly, it is queue private. always use | |
354 | * ->queue_lock. | |
1da177e4 | 355 | */ |
152587de | 356 | spinlock_t __queue_lock; |
1da177e4 LT |
357 | spinlock_t *queue_lock; |
358 | ||
359 | /* | |
360 | * queue kobject | |
361 | */ | |
362 | struct kobject kobj; | |
363 | ||
364 | /* | |
365 | * queue settings | |
366 | */ | |
367 | unsigned long nr_requests; /* Max # of requests */ | |
368 | unsigned int nr_congestion_on; | |
369 | unsigned int nr_congestion_off; | |
370 | unsigned int nr_batching; | |
371 | ||
fa0ccd83 | 372 | unsigned int dma_drain_size; |
d7b76301 | 373 | void *dma_drain_buffer; |
e3790c7d | 374 | unsigned int dma_pad_mask; |
1da177e4 LT |
375 | unsigned int dma_alignment; |
376 | ||
377 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 378 | struct list_head tag_busy_list; |
1da177e4 | 379 | |
15853af9 | 380 | unsigned int nr_sorted; |
0a7ae2ff | 381 | unsigned int in_flight[2]; |
24faf6f6 BVA |
382 | /* |
383 | * Number of active block driver functions for which blk_drain_queue() | |
384 | * must wait. Must be incremented around functions that unlock the | |
385 | * queue_lock internally, e.g. scsi_request_fn(). | |
386 | */ | |
387 | unsigned int request_fn_active; | |
1da177e4 | 388 | |
242f9dcb JA |
389 | unsigned int rq_timeout; |
390 | struct timer_list timeout; | |
391 | struct list_head timeout_list; | |
392 | ||
a612fddf | 393 | struct list_head icq_list; |
4eef3049 | 394 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 395 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 396 | struct blkcg_gq *root_blkg; |
03aa264a | 397 | struct list_head blkg_list; |
4eef3049 | 398 | #endif |
a612fddf | 399 | |
025146e1 MP |
400 | struct queue_limits limits; |
401 | ||
1da177e4 LT |
402 | /* |
403 | * sg stuff | |
404 | */ | |
405 | unsigned int sg_timeout; | |
406 | unsigned int sg_reserved_size; | |
1946089a | 407 | int node; |
6c5c9341 | 408 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 409 | struct blk_trace *blk_trace; |
6c5c9341 | 410 | #endif |
1da177e4 | 411 | /* |
4913efe4 | 412 | * for flush operations |
1da177e4 | 413 | */ |
4913efe4 | 414 | unsigned int flush_flags; |
f3876930 | 415 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 416 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
417 | unsigned int flush_pending_idx:1; |
418 | unsigned int flush_running_idx:1; | |
419 | unsigned long flush_pending_since; | |
420 | struct list_head flush_queue[2]; | |
421 | struct list_head flush_data_in_flight; | |
dd4c133f | 422 | struct request flush_rq; |
483f4afc AV |
423 | |
424 | struct mutex sysfs_lock; | |
d351af01 | 425 | |
d732580b TH |
426 | int bypass_depth; |
427 | ||
d351af01 | 428 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
429 | bsg_job_fn *bsg_job_fn; |
430 | int bsg_job_size; | |
d351af01 FT |
431 | struct bsg_class_device bsg_dev; |
432 | #endif | |
e43473b7 | 433 | |
923adde1 TH |
434 | #ifdef CONFIG_BLK_CGROUP |
435 | struct list_head all_q_node; | |
436 | #endif | |
e43473b7 VG |
437 | #ifdef CONFIG_BLK_DEV_THROTTLING |
438 | /* Throttle data */ | |
439 | struct throtl_data *td; | |
440 | #endif | |
548bc8e1 | 441 | struct rcu_head rcu_head; |
1da177e4 LT |
442 | }; |
443 | ||
1da177e4 LT |
444 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
445 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
446 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
447 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 448 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 449 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
450 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
451 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 452 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
453 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
454 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
455 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 456 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
457 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
458 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
459 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
460 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
461 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 462 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 463 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
bc58ba94 JA |
464 | |
465 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 466 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
467 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
468 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 469 | |
8bcb6c7d | 470 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 471 | { |
8bcb6c7d AK |
472 | if (q->queue_lock) |
473 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
474 | } |
475 | ||
75ad23bc NP |
476 | static inline void queue_flag_set_unlocked(unsigned int flag, |
477 | struct request_queue *q) | |
478 | { | |
479 | __set_bit(flag, &q->queue_flags); | |
480 | } | |
481 | ||
e48ec690 JA |
482 | static inline int queue_flag_test_and_clear(unsigned int flag, |
483 | struct request_queue *q) | |
484 | { | |
8bcb6c7d | 485 | queue_lockdep_assert_held(q); |
e48ec690 JA |
486 | |
487 | if (test_bit(flag, &q->queue_flags)) { | |
488 | __clear_bit(flag, &q->queue_flags); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static inline int queue_flag_test_and_set(unsigned int flag, | |
496 | struct request_queue *q) | |
497 | { | |
8bcb6c7d | 498 | queue_lockdep_assert_held(q); |
e48ec690 JA |
499 | |
500 | if (!test_bit(flag, &q->queue_flags)) { | |
501 | __set_bit(flag, &q->queue_flags); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | return 1; | |
506 | } | |
507 | ||
75ad23bc NP |
508 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
509 | { | |
8bcb6c7d | 510 | queue_lockdep_assert_held(q); |
75ad23bc NP |
511 | __set_bit(flag, &q->queue_flags); |
512 | } | |
513 | ||
514 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
515 | struct request_queue *q) | |
516 | { | |
517 | __clear_bit(flag, &q->queue_flags); | |
518 | } | |
519 | ||
0a7ae2ff JA |
520 | static inline int queue_in_flight(struct request_queue *q) |
521 | { | |
522 | return q->in_flight[0] + q->in_flight[1]; | |
523 | } | |
524 | ||
75ad23bc NP |
525 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
526 | { | |
8bcb6c7d | 527 | queue_lockdep_assert_held(q); |
75ad23bc NP |
528 | __clear_bit(flag, &q->queue_flags); |
529 | } | |
530 | ||
1da177e4 LT |
531 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
532 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 533 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 534 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 535 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
ac9fafa1 | 536 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
537 | #define blk_queue_noxmerges(q) \ |
538 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 539 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 540 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 541 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
542 | #define blk_queue_stackable(q) \ |
543 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 544 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
545 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
546 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 547 | |
33659ebb CH |
548 | #define blk_noretry_request(rq) \ |
549 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
550 | REQ_FAILFAST_DRIVER)) | |
551 | ||
552 | #define blk_account_rq(rq) \ | |
553 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 554 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 555 | |
1da177e4 | 556 | #define blk_pm_request(rq) \ |
33659ebb CH |
557 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
558 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 559 | |
ab780f1e | 560 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 561 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
562 | /* rq->queuelist of dequeued request must be list_empty() */ |
563 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
564 | |
565 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
566 | ||
4aff5e23 | 567 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 568 | |
e692cb66 MP |
569 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
570 | { | |
571 | return q->limits.cluster; | |
572 | } | |
573 | ||
9e2585a8 | 574 | /* |
1faa16d2 | 575 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 576 | */ |
1faa16d2 JA |
577 | static inline bool rw_is_sync(unsigned int rw_flags) |
578 | { | |
7b6d91da | 579 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
580 | } |
581 | ||
582 | static inline bool rq_is_sync(struct request *rq) | |
583 | { | |
584 | return rw_is_sync(rq->cmd_flags); | |
585 | } | |
586 | ||
5b788ce3 | 587 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 588 | { |
5b788ce3 TH |
589 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
590 | ||
591 | return rl->flags & flag; | |
1da177e4 LT |
592 | } |
593 | ||
5b788ce3 | 594 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 595 | { |
5b788ce3 TH |
596 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
597 | ||
598 | rl->flags |= flag; | |
1da177e4 LT |
599 | } |
600 | ||
5b788ce3 | 601 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 602 | { |
5b788ce3 TH |
603 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
604 | ||
605 | rl->flags &= ~flag; | |
1da177e4 LT |
606 | } |
607 | ||
e2a60da7 MP |
608 | static inline bool rq_mergeable(struct request *rq) |
609 | { | |
610 | if (rq->cmd_type != REQ_TYPE_FS) | |
611 | return false; | |
1da177e4 | 612 | |
e2a60da7 MP |
613 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
614 | return false; | |
615 | ||
616 | return true; | |
617 | } | |
1da177e4 | 618 | |
f31dc1cd MP |
619 | static inline bool blk_check_merge_flags(unsigned int flags1, |
620 | unsigned int flags2) | |
621 | { | |
622 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
623 | return false; | |
624 | ||
625 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
626 | return false; | |
627 | ||
4363ac7c MP |
628 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
629 | return false; | |
630 | ||
f31dc1cd MP |
631 | return true; |
632 | } | |
633 | ||
4363ac7c MP |
634 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
635 | { | |
636 | if (bio_data(a) == bio_data(b)) | |
637 | return true; | |
638 | ||
639 | return false; | |
640 | } | |
641 | ||
1da177e4 LT |
642 | /* |
643 | * q->prep_rq_fn return values | |
644 | */ | |
645 | #define BLKPREP_OK 0 /* serve it */ | |
646 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
647 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
648 | ||
649 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
650 | ||
651 | /* | |
652 | * standard bounce addresses: | |
653 | * | |
654 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
655 | * BLK_BOUNCE_ANY : don't bounce anything | |
656 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
657 | */ | |
2472892a AK |
658 | |
659 | #if BITS_PER_LONG == 32 | |
1da177e4 | 660 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
661 | #else |
662 | #define BLK_BOUNCE_HIGH -1ULL | |
663 | #endif | |
664 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 665 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 666 | |
3d6392cf JA |
667 | /* |
668 | * default timeout for SG_IO if none specified | |
669 | */ | |
670 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 671 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 672 | |
2a7326b5 | 673 | #ifdef CONFIG_BOUNCE |
1da177e4 | 674 | extern int init_emergency_isa_pool(void); |
165125e1 | 675 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
676 | #else |
677 | static inline int init_emergency_isa_pool(void) | |
678 | { | |
679 | return 0; | |
680 | } | |
165125e1 | 681 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
682 | { |
683 | } | |
684 | #endif /* CONFIG_MMU */ | |
685 | ||
152e283f FT |
686 | struct rq_map_data { |
687 | struct page **pages; | |
688 | int page_order; | |
689 | int nr_entries; | |
56c451f4 | 690 | unsigned long offset; |
97ae77a1 | 691 | int null_mapped; |
ecb554a8 | 692 | int from_user; |
152e283f FT |
693 | }; |
694 | ||
5705f702 N |
695 | struct req_iterator { |
696 | int i; | |
697 | struct bio *bio; | |
698 | }; | |
699 | ||
700 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
701 | #define for_each_bio(_bio) \ |
702 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 703 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
704 | if ((rq->bio)) \ |
705 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
706 | ||
5705f702 N |
707 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
708 | __rq_for_each_bio(_iter.bio, _rq) \ | |
709 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
710 | ||
711 | #define rq_iter_last(rq, _iter) \ | |
712 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
713 | ||
2d4dc890 IL |
714 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
715 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
716 | #endif | |
717 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
718 | extern void rq_flush_dcache_pages(struct request *rq); | |
719 | #else | |
720 | static inline void rq_flush_dcache_pages(struct request *rq) | |
721 | { | |
722 | } | |
723 | #endif | |
724 | ||
1da177e4 LT |
725 | extern int blk_register_queue(struct gendisk *disk); |
726 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 727 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 728 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 729 | extern void blk_put_request(struct request *); |
165125e1 | 730 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 731 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
732 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
733 | gfp_t); | |
165125e1 | 734 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
735 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
736 | unsigned int len); | |
82124d60 | 737 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 738 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
739 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
740 | struct bio_set *bs, gfp_t gfp_mask, | |
741 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
742 | void *data); | |
743 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
744 | extern int blk_insert_cloned_request(struct request_queue *q, |
745 | struct request *rq); | |
3cca6dc1 | 746 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 747 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 748 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
749 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
750 | unsigned int, void __user *); | |
74f3c8af AV |
751 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
752 | unsigned int, void __user *); | |
e915e872 AV |
753 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
754 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 755 | |
5a7bbad2 | 756 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 757 | |
3fcfab16 AM |
758 | /* |
759 | * A queue has just exitted congestion. Note this in the global counter of | |
760 | * congested queues, and wake up anyone who was waiting for requests to be | |
761 | * put back. | |
762 | */ | |
8aa7e847 | 763 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 764 | { |
8aa7e847 | 765 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
766 | } |
767 | ||
768 | /* | |
769 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
770 | * state flags and increment the global gounter of congested queues. | |
771 | */ | |
8aa7e847 | 772 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 773 | { |
8aa7e847 | 774 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
775 | } |
776 | ||
165125e1 JA |
777 | extern void blk_start_queue(struct request_queue *q); |
778 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 779 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 780 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 781 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 782 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 783 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 784 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
785 | struct rq_map_data *, void __user *, unsigned long, |
786 | gfp_t); | |
8e5cfc45 | 787 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
788 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
789 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
790 | struct rq_map_data *, struct sg_iovec *, int, |
791 | unsigned int, gfp_t); | |
165125e1 | 792 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 793 | struct request *, int); |
165125e1 | 794 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 795 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 796 | |
165125e1 | 797 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
798 | { |
799 | return bdev->bd_disk->queue; | |
800 | } | |
801 | ||
5efccd17 | 802 | /* |
80a761fd TH |
803 | * blk_rq_pos() : the current sector |
804 | * blk_rq_bytes() : bytes left in the entire request | |
805 | * blk_rq_cur_bytes() : bytes left in the current segment | |
806 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
807 | * blk_rq_sectors() : sectors left in the entire request | |
808 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 809 | */ |
5b93629b TH |
810 | static inline sector_t blk_rq_pos(const struct request *rq) |
811 | { | |
a2dec7b3 | 812 | return rq->__sector; |
2e46e8b2 TH |
813 | } |
814 | ||
815 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
816 | { | |
a2dec7b3 | 817 | return rq->__data_len; |
5b93629b TH |
818 | } |
819 | ||
2e46e8b2 TH |
820 | static inline int blk_rq_cur_bytes(const struct request *rq) |
821 | { | |
822 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
823 | } | |
5efccd17 | 824 | |
80a761fd TH |
825 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
826 | ||
5b93629b TH |
827 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
828 | { | |
2e46e8b2 | 829 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
830 | } |
831 | ||
832 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
833 | { | |
2e46e8b2 | 834 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
835 | } |
836 | ||
f31dc1cd MP |
837 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
838 | unsigned int cmd_flags) | |
839 | { | |
840 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
841 | return q->limits.max_discard_sectors; | |
842 | ||
4363ac7c MP |
843 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
844 | return q->limits.max_write_same_sectors; | |
845 | ||
f31dc1cd MP |
846 | return q->limits.max_sectors; |
847 | } | |
848 | ||
849 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) | |
850 | { | |
851 | struct request_queue *q = rq->q; | |
852 | ||
853 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
854 | return q->limits.max_hw_sectors; | |
855 | ||
856 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
857 | } | |
858 | ||
9934c8c0 TH |
859 | /* |
860 | * Request issue related functions. | |
861 | */ | |
862 | extern struct request *blk_peek_request(struct request_queue *q); | |
863 | extern void blk_start_request(struct request *rq); | |
864 | extern struct request *blk_fetch_request(struct request_queue *q); | |
865 | ||
1da177e4 | 866 | /* |
2e60e022 TH |
867 | * Request completion related functions. |
868 | * | |
869 | * blk_update_request() completes given number of bytes and updates | |
870 | * the request without completing it. | |
871 | * | |
f06d9a2b TH |
872 | * blk_end_request() and friends. __blk_end_request() must be called |
873 | * with the request queue spinlock acquired. | |
1da177e4 LT |
874 | * |
875 | * Several drivers define their own end_request and call | |
3bcddeac KU |
876 | * blk_end_request() for parts of the original function. |
877 | * This prevents code duplication in drivers. | |
1da177e4 | 878 | */ |
2e60e022 TH |
879 | extern bool blk_update_request(struct request *rq, int error, |
880 | unsigned int nr_bytes); | |
b1f74493 FT |
881 | extern bool blk_end_request(struct request *rq, int error, |
882 | unsigned int nr_bytes); | |
883 | extern void blk_end_request_all(struct request *rq, int error); | |
884 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 885 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
886 | extern bool __blk_end_request(struct request *rq, int error, |
887 | unsigned int nr_bytes); | |
888 | extern void __blk_end_request_all(struct request *rq, int error); | |
889 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 890 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 891 | |
ff856bad | 892 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
893 | extern void __blk_complete_request(struct request *); |
894 | extern void blk_abort_request(struct request *); | |
28018c24 | 895 | extern void blk_unprep_request(struct request *); |
ff856bad | 896 | |
1da177e4 LT |
897 | /* |
898 | * Access functions for manipulating queue properties | |
899 | */ | |
165125e1 | 900 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 901 | spinlock_t *lock, int node_id); |
165125e1 | 902 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
903 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
904 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
905 | extern void blk_cleanup_queue(struct request_queue *); |
906 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
907 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 908 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 909 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 910 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 911 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
912 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
913 | unsigned int max_discard_sectors); | |
4363ac7c MP |
914 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
915 | unsigned int max_write_same_sectors); | |
e1defc4f | 916 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 917 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
918 | extern void blk_queue_alignment_offset(struct request_queue *q, |
919 | unsigned int alignment); | |
7c958e32 | 920 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 921 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 922 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 923 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 924 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 925 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
926 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
927 | sector_t offset); | |
17be8c24 MP |
928 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
929 | sector_t offset); | |
c72758f3 MP |
930 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
931 | sector_t offset); | |
165125e1 | 932 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 933 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 934 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
935 | extern int blk_queue_dma_drain(struct request_queue *q, |
936 | dma_drain_needed_fn *dma_drain_needed, | |
937 | void *buf, unsigned int size); | |
ef9e3fac | 938 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
939 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
940 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 941 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
942 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
943 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 944 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 945 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
946 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
947 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 948 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 949 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 950 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 951 | |
165125e1 | 952 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
953 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
954 | struct scatterlist *sglist); | |
1da177e4 | 955 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 956 | extern long nr_blockdev_pages(void); |
1da177e4 | 957 | |
09ac46c4 | 958 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
959 | struct request_queue *blk_alloc_queue(gfp_t); |
960 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
961 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 962 | |
316cc67d | 963 | /* |
75df7136 SJ |
964 | * blk_plug permits building a queue of related requests by holding the I/O |
965 | * fragments for a short period. This allows merging of sequential requests | |
966 | * into single larger request. As the requests are moved from a per-task list to | |
967 | * the device's request_queue in a batch, this results in improved scalability | |
968 | * as the lock contention for request_queue lock is reduced. | |
969 | * | |
970 | * It is ok not to disable preemption when adding the request to the plug list | |
971 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
972 | * the plug list when the task sleeps by itself. For details, please see | |
973 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 974 | */ |
73c10101 | 975 | struct blk_plug { |
75df7136 SJ |
976 | unsigned long magic; /* detect uninitialized use-cases */ |
977 | struct list_head list; /* requests */ | |
978 | struct list_head cb_list; /* md requires an unplug callback */ | |
73c10101 | 979 | }; |
55c022bb SL |
980 | #define BLK_MAX_REQUEST_COUNT 16 |
981 | ||
9cbb1750 | 982 | struct blk_plug_cb; |
74018dc3 | 983 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
984 | struct blk_plug_cb { |
985 | struct list_head list; | |
9cbb1750 N |
986 | blk_plug_cb_fn callback; |
987 | void *data; | |
048c9374 | 988 | }; |
9cbb1750 N |
989 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
990 | void *data, int size); | |
73c10101 JA |
991 | extern void blk_start_plug(struct blk_plug *); |
992 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 993 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
994 | |
995 | static inline void blk_flush_plug(struct task_struct *tsk) | |
996 | { | |
997 | struct blk_plug *plug = tsk->plug; | |
998 | ||
a237c1c5 JA |
999 | if (plug) |
1000 | blk_flush_plug_list(plug, false); | |
1001 | } | |
1002 | ||
1003 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1004 | { | |
1005 | struct blk_plug *plug = tsk->plug; | |
1006 | ||
88b996cd | 1007 | if (plug) |
f6603783 | 1008 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1009 | } |
1010 | ||
1011 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1012 | { | |
1013 | struct blk_plug *plug = tsk->plug; | |
1014 | ||
048c9374 | 1015 | return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); |
73c10101 JA |
1016 | } |
1017 | ||
1da177e4 LT |
1018 | /* |
1019 | * tag stuff | |
1020 | */ | |
4aff5e23 | 1021 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
1022 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1023 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1024 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1025 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1026 | extern void blk_queue_free_tags(struct request_queue *); | |
1027 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1028 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1029 | extern struct blk_queue_tag *blk_init_tags(int); |
1030 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1031 | |
f583f492 DS |
1032 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1033 | int tag) | |
1034 | { | |
1035 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1036 | return NULL; | |
1037 | return bqt->tag_index[tag]; | |
1038 | } | |
dd3932ed CH |
1039 | |
1040 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1041 | ||
1042 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1043 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1044 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1045 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1046 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1047 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 1048 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
1049 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1050 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1051 | { |
2cf6d26a CH |
1052 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1053 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1054 | gfp_mask, flags); | |
fb2dce86 | 1055 | } |
e6fa0be6 | 1056 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1057 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1058 | { |
1059 | return blkdev_issue_zeroout(sb->s_bdev, | |
1060 | block << (sb->s_blocksize_bits - 9), | |
1061 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1062 | gfp_mask); |
e6fa0be6 | 1063 | } |
1da177e4 | 1064 | |
018e0446 | 1065 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1066 | |
eb28d31b MP |
1067 | enum blk_default_limits { |
1068 | BLK_MAX_SEGMENTS = 128, | |
1069 | BLK_SAFE_MAX_SECTORS = 255, | |
1070 | BLK_DEF_MAX_SECTORS = 1024, | |
1071 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1072 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1073 | }; | |
0e435ac2 | 1074 | |
1da177e4 LT |
1075 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1076 | ||
ae03bf63 MP |
1077 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1078 | { | |
025146e1 | 1079 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1080 | } |
1081 | ||
1082 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1083 | { | |
025146e1 | 1084 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1085 | } |
1086 | ||
1087 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1088 | { | |
025146e1 | 1089 | return q->limits.max_sectors; |
ae03bf63 MP |
1090 | } |
1091 | ||
1092 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1093 | { | |
025146e1 | 1094 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1095 | } |
1096 | ||
8a78362c | 1097 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1098 | { |
8a78362c | 1099 | return q->limits.max_segments; |
ae03bf63 MP |
1100 | } |
1101 | ||
1102 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1103 | { | |
025146e1 | 1104 | return q->limits.max_segment_size; |
ae03bf63 MP |
1105 | } |
1106 | ||
e1defc4f | 1107 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1108 | { |
1109 | int retval = 512; | |
1110 | ||
025146e1 MP |
1111 | if (q && q->limits.logical_block_size) |
1112 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1113 | |
1114 | return retval; | |
1115 | } | |
1116 | ||
e1defc4f | 1117 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1118 | { |
e1defc4f | 1119 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1120 | } |
1121 | ||
c72758f3 MP |
1122 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1123 | { | |
1124 | return q->limits.physical_block_size; | |
1125 | } | |
1126 | ||
892b6f90 | 1127 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1128 | { |
1129 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1130 | } | |
1131 | ||
c72758f3 MP |
1132 | static inline unsigned int queue_io_min(struct request_queue *q) |
1133 | { | |
1134 | return q->limits.io_min; | |
1135 | } | |
1136 | ||
ac481c20 MP |
1137 | static inline int bdev_io_min(struct block_device *bdev) |
1138 | { | |
1139 | return queue_io_min(bdev_get_queue(bdev)); | |
1140 | } | |
1141 | ||
c72758f3 MP |
1142 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1143 | { | |
1144 | return q->limits.io_opt; | |
1145 | } | |
1146 | ||
ac481c20 MP |
1147 | static inline int bdev_io_opt(struct block_device *bdev) |
1148 | { | |
1149 | return queue_io_opt(bdev_get_queue(bdev)); | |
1150 | } | |
1151 | ||
c72758f3 MP |
1152 | static inline int queue_alignment_offset(struct request_queue *q) |
1153 | { | |
ac481c20 | 1154 | if (q->limits.misaligned) |
c72758f3 MP |
1155 | return -1; |
1156 | ||
ac481c20 | 1157 | return q->limits.alignment_offset; |
c72758f3 MP |
1158 | } |
1159 | ||
e03a72e1 | 1160 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1161 | { |
1162 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1163 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1164 | |
e03a72e1 MP |
1165 | return (granularity + lim->alignment_offset - alignment) |
1166 | & (granularity - 1); | |
c72758f3 MP |
1167 | } |
1168 | ||
ac481c20 MP |
1169 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1170 | { | |
1171 | struct request_queue *q = bdev_get_queue(bdev); | |
1172 | ||
1173 | if (q->limits.misaligned) | |
1174 | return -1; | |
1175 | ||
1176 | if (bdev != bdev->bd_contains) | |
1177 | return bdev->bd_part->alignment_offset; | |
1178 | ||
1179 | return q->limits.alignment_offset; | |
1180 | } | |
1181 | ||
86b37281 MP |
1182 | static inline int queue_discard_alignment(struct request_queue *q) |
1183 | { | |
1184 | if (q->limits.discard_misaligned) | |
1185 | return -1; | |
1186 | ||
1187 | return q->limits.discard_alignment; | |
1188 | } | |
1189 | ||
e03a72e1 | 1190 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1191 | { |
59771079 | 1192 | unsigned int alignment, granularity, offset; |
dd3d145d | 1193 | |
a934a00a MP |
1194 | if (!lim->max_discard_sectors) |
1195 | return 0; | |
1196 | ||
59771079 LT |
1197 | /* Why are these in bytes, not sectors? */ |
1198 | alignment = lim->discard_alignment >> 9; | |
1199 | granularity = lim->discard_granularity >> 9; | |
1200 | if (!granularity) | |
1201 | return 0; | |
1202 | ||
1203 | /* Offset of the partition start in 'granularity' sectors */ | |
1204 | offset = sector_div(sector, granularity); | |
1205 | ||
1206 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1207 | offset = (granularity + alignment - offset) % granularity; | |
1208 | ||
1209 | /* Turn it back into bytes, gaah */ | |
1210 | return offset << 9; | |
86b37281 MP |
1211 | } |
1212 | ||
c6e66634 PB |
1213 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1214 | { | |
1215 | struct request_queue *q = bdev_get_queue(bdev); | |
1216 | ||
1217 | if (bdev != bdev->bd_contains) | |
1218 | return bdev->bd_part->discard_alignment; | |
1219 | ||
1220 | return q->limits.discard_alignment; | |
1221 | } | |
1222 | ||
98262f27 MP |
1223 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1224 | { | |
a934a00a | 1225 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1226 | return 1; |
1227 | ||
1228 | return 0; | |
1229 | } | |
1230 | ||
1231 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1232 | { | |
1233 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1234 | } | |
1235 | ||
4363ac7c MP |
1236 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1237 | { | |
1238 | struct request_queue *q = bdev_get_queue(bdev); | |
1239 | ||
1240 | if (q) | |
1241 | return q->limits.max_write_same_sectors; | |
1242 | ||
1243 | return 0; | |
1244 | } | |
1245 | ||
165125e1 | 1246 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1247 | { |
482eb689 | 1248 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1249 | } |
1250 | ||
14417799 | 1251 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1252 | unsigned int len) |
1253 | { | |
1254 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1255 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1256 | } |
1257 | ||
1da177e4 LT |
1258 | /* assumes size > 256 */ |
1259 | static inline unsigned int blksize_bits(unsigned int size) | |
1260 | { | |
1261 | unsigned int bits = 8; | |
1262 | do { | |
1263 | bits++; | |
1264 | size >>= 1; | |
1265 | } while (size > 256); | |
1266 | return bits; | |
1267 | } | |
1268 | ||
2befb9e3 | 1269 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1270 | { |
1271 | return bdev->bd_block_size; | |
1272 | } | |
1273 | ||
f3876930 | 1274 | static inline bool queue_flush_queueable(struct request_queue *q) |
1275 | { | |
1276 | return !q->flush_not_queueable; | |
1277 | } | |
1278 | ||
1da177e4 LT |
1279 | typedef struct {struct page *v;} Sector; |
1280 | ||
1281 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1282 | ||
1283 | static inline void put_dev_sector(Sector p) | |
1284 | { | |
1285 | page_cache_release(p.v); | |
1286 | } | |
1287 | ||
1288 | struct work_struct; | |
18887ad9 | 1289 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1290 | |
9195291e | 1291 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1292 | /* |
1293 | * This should not be using sched_clock(). A real patch is in progress | |
1294 | * to fix this up, until that is in place we need to disable preemption | |
1295 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1296 | */ | |
9195291e DS |
1297 | static inline void set_start_time_ns(struct request *req) |
1298 | { | |
28f4197e | 1299 | preempt_disable(); |
9195291e | 1300 | req->start_time_ns = sched_clock(); |
28f4197e | 1301 | preempt_enable(); |
9195291e DS |
1302 | } |
1303 | ||
1304 | static inline void set_io_start_time_ns(struct request *req) | |
1305 | { | |
28f4197e | 1306 | preempt_disable(); |
9195291e | 1307 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1308 | preempt_enable(); |
9195291e | 1309 | } |
84c124da DS |
1310 | |
1311 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1312 | { | |
1313 | return req->start_time_ns; | |
1314 | } | |
1315 | ||
1316 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1317 | { | |
1318 | return req->io_start_time_ns; | |
1319 | } | |
9195291e DS |
1320 | #else |
1321 | static inline void set_start_time_ns(struct request *req) {} | |
1322 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1323 | static inline uint64_t rq_start_time_ns(struct request *req) |
1324 | { | |
1325 | return 0; | |
1326 | } | |
1327 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1328 | { | |
1329 | return 0; | |
1330 | } | |
9195291e DS |
1331 | #endif |
1332 | ||
1da177e4 LT |
1333 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1334 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1335 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1336 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1337 | ||
7ba1ba12 MP |
1338 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1339 | ||
b24498d4 JA |
1340 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1341 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1342 | |
1343 | struct blk_integrity_exchg { | |
1344 | void *prot_buf; | |
1345 | void *data_buf; | |
1346 | sector_t sector; | |
1347 | unsigned int data_size; | |
1348 | unsigned short sector_size; | |
1349 | const char *disk_name; | |
1350 | }; | |
1351 | ||
1352 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1353 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1354 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1355 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1356 | ||
1357 | struct blk_integrity { | |
1358 | integrity_gen_fn *generate_fn; | |
1359 | integrity_vrfy_fn *verify_fn; | |
1360 | integrity_set_tag_fn *set_tag_fn; | |
1361 | integrity_get_tag_fn *get_tag_fn; | |
1362 | ||
1363 | unsigned short flags; | |
1364 | unsigned short tuple_size; | |
1365 | unsigned short sector_size; | |
1366 | unsigned short tag_size; | |
1367 | ||
1368 | const char *name; | |
1369 | ||
1370 | struct kobject kobj; | |
1371 | }; | |
1372 | ||
a63a5cf8 | 1373 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1374 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1375 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1376 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1377 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1378 | struct scatterlist *); | |
1379 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1380 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1381 | struct request *); | |
1382 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1383 | struct bio *); | |
7ba1ba12 | 1384 | |
b04accc4 JA |
1385 | static inline |
1386 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1387 | { | |
1388 | return bdev->bd_disk->integrity; | |
1389 | } | |
1390 | ||
b02739b0 MP |
1391 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1392 | { | |
1393 | return disk->integrity; | |
1394 | } | |
1395 | ||
7ba1ba12 MP |
1396 | static inline int blk_integrity_rq(struct request *rq) |
1397 | { | |
d442cc44 MP |
1398 | if (rq->bio == NULL) |
1399 | return 0; | |
1400 | ||
7ba1ba12 MP |
1401 | return bio_integrity(rq->bio); |
1402 | } | |
1403 | ||
13f05c8d MP |
1404 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1405 | unsigned int segs) | |
1406 | { | |
1407 | q->limits.max_integrity_segments = segs; | |
1408 | } | |
1409 | ||
1410 | static inline unsigned short | |
1411 | queue_max_integrity_segments(struct request_queue *q) | |
1412 | { | |
1413 | return q->limits.max_integrity_segments; | |
1414 | } | |
1415 | ||
7ba1ba12 MP |
1416 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1417 | ||
fd83240a SR |
1418 | struct bio; |
1419 | struct block_device; | |
1420 | struct gendisk; | |
1421 | struct blk_integrity; | |
1422 | ||
1423 | static inline int blk_integrity_rq(struct request *rq) | |
1424 | { | |
1425 | return 0; | |
1426 | } | |
1427 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1428 | struct bio *b) | |
1429 | { | |
1430 | return 0; | |
1431 | } | |
1432 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1433 | struct bio *b, | |
1434 | struct scatterlist *s) | |
1435 | { | |
1436 | return 0; | |
1437 | } | |
1438 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1439 | { | |
1440 | return 0; | |
1441 | } | |
1442 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1443 | { | |
1444 | return NULL; | |
1445 | } | |
1446 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1447 | { | |
1448 | return 0; | |
1449 | } | |
1450 | static inline int blk_integrity_register(struct gendisk *d, | |
1451 | struct blk_integrity *b) | |
1452 | { | |
1453 | return 0; | |
1454 | } | |
1455 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1456 | { | |
1457 | } | |
1458 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1459 | unsigned int segs) | |
1460 | { | |
1461 | } | |
1462 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1463 | { | |
1464 | return 0; | |
1465 | } | |
1466 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1467 | struct request *r1, | |
1468 | struct request *r2) | |
1469 | { | |
1470 | return 0; | |
1471 | } | |
1472 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1473 | struct request *r, | |
1474 | struct bio *b) | |
1475 | { | |
1476 | return 0; | |
1477 | } | |
1478 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1479 | { | |
1480 | return 0; | |
1481 | } | |
7ba1ba12 MP |
1482 | |
1483 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1484 | ||
08f85851 | 1485 | struct block_device_operations { |
d4430d62 AV |
1486 | int (*open) (struct block_device *, fmode_t); |
1487 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1488 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1489 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1490 | int (*direct_access) (struct block_device *, sector_t, |
1491 | void **, unsigned long *); | |
77ea887e TH |
1492 | unsigned int (*check_events) (struct gendisk *disk, |
1493 | unsigned int clearing); | |
1494 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1495 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1496 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1497 | int (*revalidate_disk) (struct gendisk *); |
1498 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1499 | /* this callback is with swap_lock and sometimes page table lock held */ |
1500 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1501 | struct module *owner; |
1502 | }; | |
1503 | ||
633a08b8 AV |
1504 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1505 | unsigned long); | |
9361401e DH |
1506 | #else /* CONFIG_BLOCK */ |
1507 | /* | |
1508 | * stubs for when the block layer is configured out | |
1509 | */ | |
1510 | #define buffer_heads_over_limit 0 | |
1511 | ||
9361401e DH |
1512 | static inline long nr_blockdev_pages(void) |
1513 | { | |
1514 | return 0; | |
1515 | } | |
1516 | ||
1f940bdf JA |
1517 | struct blk_plug { |
1518 | }; | |
1519 | ||
1520 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1521 | { |
1522 | } | |
1523 | ||
1f940bdf | 1524 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1525 | { |
1526 | } | |
1527 | ||
1f940bdf | 1528 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1529 | { |
1530 | } | |
1531 | ||
a237c1c5 JA |
1532 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1533 | { | |
1534 | } | |
1535 | ||
1536 | ||
73c10101 JA |
1537 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1538 | { | |
1539 | return false; | |
1540 | } | |
1541 | ||
9361401e DH |
1542 | #endif /* CONFIG_BLOCK */ |
1543 | ||
1da177e4 | 1544 | #endif |