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