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1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
85fd0bc9 RK |
4 | #include <linux/sched.h> |
5 | ||
f5ff8422 JA |
6 | #ifdef CONFIG_BLOCK |
7 | ||
1da177e4 LT |
8 | #include <linux/major.h> |
9 | #include <linux/genhd.h> | |
10 | #include <linux/list.h> | |
320ae51f | 11 | #include <linux/llist.h> |
1da177e4 LT |
12 | #include <linux/timer.h> |
13 | #include <linux/workqueue.h> | |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/backing-dev.h> | |
16 | #include <linux/wait.h> | |
17 | #include <linux/mempool.h> | |
18 | #include <linux/bio.h> | |
1da177e4 | 19 | #include <linux/stringify.h> |
3e6053d7 | 20 | #include <linux/gfp.h> |
d351af01 | 21 | #include <linux/bsg.h> |
c7c22e4d | 22 | #include <linux/smp.h> |
548bc8e1 | 23 | #include <linux/rcupdate.h> |
add703fd | 24 | #include <linux/percpu-refcount.h> |
1da177e4 LT |
25 | |
26 | #include <asm/scatterlist.h> | |
27 | ||
de477254 | 28 | struct module; |
21b2f0c8 CH |
29 | struct scsi_ioctl_command; |
30 | ||
1da177e4 | 31 | struct request_queue; |
1da177e4 | 32 | struct elevator_queue; |
1da177e4 | 33 | struct request_pm_state; |
2056a782 | 34 | struct blk_trace; |
3d6392cf JA |
35 | struct request; |
36 | struct sg_io_hdr; | |
aa387cc8 | 37 | struct bsg_job; |
3c798398 | 38 | struct blkcg_gq; |
7c94e1c1 | 39 | struct blk_flush_queue; |
1da177e4 LT |
40 | |
41 | #define BLKDEV_MIN_RQ 4 | |
42 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
43 | ||
8bd435b3 TH |
44 | /* |
45 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
46 | * Defined here to simplify include dependency. | |
47 | */ | |
48 | #define BLKCG_MAX_POLS 2 | |
49 | ||
1da177e4 | 50 | struct request; |
8ffdc655 | 51 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 52 | |
5b788ce3 TH |
53 | #define BLK_RL_SYNCFULL (1U << 0) |
54 | #define BLK_RL_ASYNCFULL (1U << 1) | |
55 | ||
1da177e4 | 56 | struct request_list { |
5b788ce3 | 57 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
58 | #ifdef CONFIG_BLK_CGROUP |
59 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
60 | #endif | |
1faa16d2 JA |
61 | /* |
62 | * count[], starved[], and wait[] are indexed by | |
63 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
64 | */ | |
8a5ecdd4 TH |
65 | int count[2]; |
66 | int starved[2]; | |
67 | mempool_t *rq_pool; | |
68 | wait_queue_head_t wait[2]; | |
5b788ce3 | 69 | unsigned int flags; |
1da177e4 LT |
70 | }; |
71 | ||
4aff5e23 JA |
72 | /* |
73 | * request command types | |
74 | */ | |
75 | enum rq_cmd_type_bits { | |
76 | REQ_TYPE_FS = 1, /* fs request */ | |
77 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
78 | REQ_TYPE_SENSE, /* sense request */ | |
79 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
80 | REQ_TYPE_PM_RESUME, /* resume request */ | |
81 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 82 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
83 | /* |
84 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
85 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
86 | * private REQ_LB opcodes to differentiate what type of request this is | |
87 | */ | |
4aff5e23 | 88 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 89 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
90 | }; |
91 | ||
1da177e4 LT |
92 | #define BLK_MAX_CDB 16 |
93 | ||
94 | /* | |
af76e555 CH |
95 | * Try to put the fields that are referenced together in the same cacheline. |
96 | * | |
97 | * If you modify this structure, make sure to update blk_rq_init() and | |
98 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
99 | */ |
100 | struct request { | |
6897fc22 | 101 | struct list_head queuelist; |
320ae51f JA |
102 | union { |
103 | struct call_single_data csd; | |
8b4922d3 | 104 | unsigned long fifo_time; |
320ae51f | 105 | }; |
ff856bad | 106 | |
165125e1 | 107 | struct request_queue *q; |
320ae51f | 108 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 109 | |
5953316d | 110 | u64 cmd_flags; |
4aff5e23 | 111 | enum rq_cmd_type_bits cmd_type; |
242f9dcb | 112 | unsigned long atomic_flags; |
1da177e4 | 113 | |
181fdde3 RK |
114 | int cpu; |
115 | ||
a2dec7b3 | 116 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 117 | unsigned int __data_len; /* total data len */ |
181fdde3 | 118 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
119 | |
120 | struct bio *bio; | |
121 | struct bio *biotail; | |
122 | ||
360f92c2 JA |
123 | /* |
124 | * The hash is used inside the scheduler, and killed once the | |
125 | * request reaches the dispatch list. The ipi_list is only used | |
126 | * to queue the request for softirq completion, which is long | |
127 | * after the request has been unhashed (and even removed from | |
128 | * the dispatch list). | |
129 | */ | |
130 | union { | |
131 | struct hlist_node hash; /* merge hash */ | |
132 | struct list_head ipi_list; | |
133 | }; | |
134 | ||
e6a1c874 JA |
135 | /* |
136 | * The rb_node is only used inside the io scheduler, requests | |
137 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 138 | * completion_data share space with the rb_node. |
e6a1c874 JA |
139 | */ |
140 | union { | |
141 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 142 | void *completion_data; |
e6a1c874 | 143 | }; |
9817064b | 144 | |
ff7d145f | 145 | /* |
7f1dc8a2 | 146 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
147 | * more they have to dynamically allocate it. Flush requests are |
148 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 149 | * space with the elevator data. |
ff7d145f | 150 | */ |
c186794d | 151 | union { |
a612fddf TH |
152 | struct { |
153 | struct io_cq *icq; | |
154 | void *priv[2]; | |
155 | } elv; | |
156 | ||
c186794d MS |
157 | struct { |
158 | unsigned int seq; | |
159 | struct list_head list; | |
4853abaa | 160 | rq_end_io_fn *saved_end_io; |
c186794d MS |
161 | } flush; |
162 | }; | |
ff7d145f | 163 | |
8f34ee75 | 164 | struct gendisk *rq_disk; |
09e099d4 | 165 | struct hd_struct *part; |
1da177e4 | 166 | unsigned long start_time; |
9195291e | 167 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 168 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
169 | unsigned long long start_time_ns; |
170 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
171 | #endif | |
1da177e4 LT |
172 | /* Number of scatter-gather DMA addr+len pairs after |
173 | * physical address coalescing is performed. | |
174 | */ | |
175 | unsigned short nr_phys_segments; | |
13f05c8d MP |
176 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
177 | unsigned short nr_integrity_segments; | |
178 | #endif | |
1da177e4 | 179 | |
8f34ee75 JA |
180 | unsigned short ioprio; |
181 | ||
731ec497 | 182 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 183 | |
cdd60262 JA |
184 | int tag; |
185 | int errors; | |
186 | ||
1da177e4 LT |
187 | /* |
188 | * when request is used as a packet command carrier | |
189 | */ | |
d7e3c324 FT |
190 | unsigned char __cmd[BLK_MAX_CDB]; |
191 | unsigned char *cmd; | |
181fdde3 | 192 | unsigned short cmd_len; |
1da177e4 | 193 | |
7a85f889 | 194 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 195 | unsigned int sense_len; |
c3a4d78c | 196 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
197 | void *sense; |
198 | ||
242f9dcb JA |
199 | unsigned long deadline; |
200 | struct list_head timeout_list; | |
1da177e4 | 201 | unsigned int timeout; |
17e01f21 | 202 | int retries; |
1da177e4 | 203 | |
1da177e4 | 204 | /* |
c00895ab | 205 | * completion callback. |
1da177e4 LT |
206 | */ |
207 | rq_end_io_fn *end_io; | |
208 | void *end_io_data; | |
abae1fde FT |
209 | |
210 | /* for bidi */ | |
211 | struct request *next_rq; | |
1da177e4 LT |
212 | }; |
213 | ||
766ca442 FLVC |
214 | static inline unsigned short req_get_ioprio(struct request *req) |
215 | { | |
216 | return req->ioprio; | |
217 | } | |
218 | ||
1da177e4 | 219 | /* |
4aff5e23 | 220 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
221 | * requests. Some step values could eventually be made generic. |
222 | */ | |
223 | struct request_pm_state | |
224 | { | |
225 | /* PM state machine step value, currently driver specific */ | |
226 | int pm_step; | |
227 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
228 | u32 pm_state; | |
229 | void* data; /* for driver use */ | |
230 | }; | |
231 | ||
232 | #include <linux/elevator.h> | |
233 | ||
320ae51f JA |
234 | struct blk_queue_ctx; |
235 | ||
165125e1 | 236 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 237 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 238 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 239 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
240 | |
241 | struct bio_vec; | |
cc371e66 AK |
242 | struct bvec_merge_data { |
243 | struct block_device *bi_bdev; | |
244 | sector_t bi_sector; | |
245 | unsigned bi_size; | |
246 | unsigned long bi_rw; | |
247 | }; | |
248 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
249 | struct bio_vec *); | |
ff856bad | 250 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 251 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 252 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 253 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 254 | |
242f9dcb JA |
255 | enum blk_eh_timer_return { |
256 | BLK_EH_NOT_HANDLED, | |
257 | BLK_EH_HANDLED, | |
258 | BLK_EH_RESET_TIMER, | |
259 | }; | |
260 | ||
261 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
262 | ||
1da177e4 LT |
263 | enum blk_queue_state { |
264 | Queue_down, | |
265 | Queue_up, | |
266 | }; | |
267 | ||
1da177e4 LT |
268 | struct blk_queue_tag { |
269 | struct request **tag_index; /* map of busy tags */ | |
270 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
271 | int busy; /* current depth */ |
272 | int max_depth; /* what we will send to device */ | |
ba025082 | 273 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 274 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
275 | int alloc_policy; /* tag allocation policy */ |
276 | int next_tag; /* next tag */ | |
1da177e4 | 277 | }; |
ee1b6f7a SL |
278 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
279 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 280 | |
abf54393 FT |
281 | #define BLK_SCSI_MAX_CMDS (256) |
282 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
283 | ||
025146e1 MP |
284 | struct queue_limits { |
285 | unsigned long bounce_pfn; | |
286 | unsigned long seg_boundary_mask; | |
287 | ||
288 | unsigned int max_hw_sectors; | |
762380ad | 289 | unsigned int chunk_sectors; |
025146e1 MP |
290 | unsigned int max_sectors; |
291 | unsigned int max_segment_size; | |
c72758f3 MP |
292 | unsigned int physical_block_size; |
293 | unsigned int alignment_offset; | |
294 | unsigned int io_min; | |
295 | unsigned int io_opt; | |
67efc925 | 296 | unsigned int max_discard_sectors; |
4363ac7c | 297 | unsigned int max_write_same_sectors; |
86b37281 MP |
298 | unsigned int discard_granularity; |
299 | unsigned int discard_alignment; | |
025146e1 MP |
300 | |
301 | unsigned short logical_block_size; | |
8a78362c | 302 | unsigned short max_segments; |
13f05c8d | 303 | unsigned short max_integrity_segments; |
025146e1 | 304 | |
c72758f3 | 305 | unsigned char misaligned; |
86b37281 | 306 | unsigned char discard_misaligned; |
e692cb66 | 307 | unsigned char cluster; |
a934a00a | 308 | unsigned char discard_zeroes_data; |
c78afc62 | 309 | unsigned char raid_partial_stripes_expensive; |
025146e1 MP |
310 | }; |
311 | ||
d7b76301 | 312 | struct request_queue { |
1da177e4 LT |
313 | /* |
314 | * Together with queue_head for cacheline sharing | |
315 | */ | |
316 | struct list_head queue_head; | |
317 | struct request *last_merge; | |
b374d18a | 318 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
319 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
320 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
321 | |
322 | /* | |
a051661c TH |
323 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
324 | * is used, root blkg allocates from @q->root_rl and all other | |
325 | * blkgs from their own blkg->rl. Which one to use should be | |
326 | * determined using bio_request_list(). | |
1da177e4 | 327 | */ |
a051661c | 328 | struct request_list root_rl; |
1da177e4 LT |
329 | |
330 | request_fn_proc *request_fn; | |
1da177e4 LT |
331 | make_request_fn *make_request_fn; |
332 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 333 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 334 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 335 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 336 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 337 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 338 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 339 | |
320ae51f JA |
340 | struct blk_mq_ops *mq_ops; |
341 | ||
342 | unsigned int *mq_map; | |
343 | ||
344 | /* sw queues */ | |
e6cdb092 | 345 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
346 | unsigned int nr_queues; |
347 | ||
348 | /* hw dispatch queues */ | |
349 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
350 | unsigned int nr_hw_queues; | |
351 | ||
8922e16c TH |
352 | /* |
353 | * Dispatch queue sorting | |
354 | */ | |
1b47f531 | 355 | sector_t end_sector; |
8922e16c | 356 | struct request *boundary_rq; |
8922e16c | 357 | |
1da177e4 | 358 | /* |
3cca6dc1 | 359 | * Delayed queue handling |
1da177e4 | 360 | */ |
3cca6dc1 | 361 | struct delayed_work delay_work; |
1da177e4 LT |
362 | |
363 | struct backing_dev_info backing_dev_info; | |
364 | ||
365 | /* | |
366 | * The queue owner gets to use this for whatever they like. | |
367 | * ll_rw_blk doesn't touch it. | |
368 | */ | |
369 | void *queuedata; | |
370 | ||
1da177e4 | 371 | /* |
d7b76301 | 372 | * various queue flags, see QUEUE_* below |
1da177e4 | 373 | */ |
d7b76301 | 374 | unsigned long queue_flags; |
1da177e4 | 375 | |
a73f730d TH |
376 | /* |
377 | * ida allocated id for this queue. Used to index queues from | |
378 | * ioctx. | |
379 | */ | |
380 | int id; | |
381 | ||
1da177e4 | 382 | /* |
d7b76301 | 383 | * queue needs bounce pages for pages above this limit |
1da177e4 | 384 | */ |
d7b76301 | 385 | gfp_t bounce_gfp; |
1da177e4 LT |
386 | |
387 | /* | |
152587de | 388 | * protects queue structures from reentrancy. ->__queue_lock should |
389 | * _never_ be used directly, it is queue private. always use | |
390 | * ->queue_lock. | |
1da177e4 | 391 | */ |
152587de | 392 | spinlock_t __queue_lock; |
1da177e4 LT |
393 | spinlock_t *queue_lock; |
394 | ||
395 | /* | |
396 | * queue kobject | |
397 | */ | |
398 | struct kobject kobj; | |
399 | ||
320ae51f JA |
400 | /* |
401 | * mq queue kobject | |
402 | */ | |
403 | struct kobject mq_kobj; | |
404 | ||
47fafbc7 | 405 | #ifdef CONFIG_PM |
6c954667 LM |
406 | struct device *dev; |
407 | int rpm_status; | |
408 | unsigned int nr_pending; | |
409 | #endif | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * queue settings | |
413 | */ | |
414 | unsigned long nr_requests; /* Max # of requests */ | |
415 | unsigned int nr_congestion_on; | |
416 | unsigned int nr_congestion_off; | |
417 | unsigned int nr_batching; | |
418 | ||
fa0ccd83 | 419 | unsigned int dma_drain_size; |
d7b76301 | 420 | void *dma_drain_buffer; |
e3790c7d | 421 | unsigned int dma_pad_mask; |
1da177e4 LT |
422 | unsigned int dma_alignment; |
423 | ||
424 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 425 | struct list_head tag_busy_list; |
1da177e4 | 426 | |
15853af9 | 427 | unsigned int nr_sorted; |
0a7ae2ff | 428 | unsigned int in_flight[2]; |
24faf6f6 BVA |
429 | /* |
430 | * Number of active block driver functions for which blk_drain_queue() | |
431 | * must wait. Must be incremented around functions that unlock the | |
432 | * queue_lock internally, e.g. scsi_request_fn(). | |
433 | */ | |
434 | unsigned int request_fn_active; | |
1da177e4 | 435 | |
242f9dcb JA |
436 | unsigned int rq_timeout; |
437 | struct timer_list timeout; | |
438 | struct list_head timeout_list; | |
439 | ||
a612fddf | 440 | struct list_head icq_list; |
4eef3049 | 441 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 442 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 443 | struct blkcg_gq *root_blkg; |
03aa264a | 444 | struct list_head blkg_list; |
4eef3049 | 445 | #endif |
a612fddf | 446 | |
025146e1 MP |
447 | struct queue_limits limits; |
448 | ||
1da177e4 LT |
449 | /* |
450 | * sg stuff | |
451 | */ | |
452 | unsigned int sg_timeout; | |
453 | unsigned int sg_reserved_size; | |
1946089a | 454 | int node; |
6c5c9341 | 455 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 456 | struct blk_trace *blk_trace; |
6c5c9341 | 457 | #endif |
1da177e4 | 458 | /* |
4913efe4 | 459 | * for flush operations |
1da177e4 | 460 | */ |
4913efe4 | 461 | unsigned int flush_flags; |
f3876930 | 462 | unsigned int flush_not_queueable:1; |
7c94e1c1 | 463 | struct blk_flush_queue *fq; |
483f4afc | 464 | |
6fca6a61 CH |
465 | struct list_head requeue_list; |
466 | spinlock_t requeue_lock; | |
467 | struct work_struct requeue_work; | |
468 | ||
483f4afc | 469 | struct mutex sysfs_lock; |
d351af01 | 470 | |
d732580b | 471 | int bypass_depth; |
780db207 | 472 | int mq_freeze_depth; |
d732580b | 473 | |
d351af01 | 474 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
475 | bsg_job_fn *bsg_job_fn; |
476 | int bsg_job_size; | |
d351af01 FT |
477 | struct bsg_class_device bsg_dev; |
478 | #endif | |
e43473b7 VG |
479 | |
480 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
481 | /* Throttle data */ | |
482 | struct throtl_data *td; | |
483 | #endif | |
548bc8e1 | 484 | struct rcu_head rcu_head; |
320ae51f | 485 | wait_queue_head_t mq_freeze_wq; |
add703fd | 486 | struct percpu_ref mq_usage_counter; |
320ae51f | 487 | struct list_head all_q_node; |
0d2602ca JA |
488 | |
489 | struct blk_mq_tag_set *tag_set; | |
490 | struct list_head tag_set_list; | |
1da177e4 LT |
491 | }; |
492 | ||
1da177e4 LT |
493 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
494 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
495 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
496 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 497 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 498 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
499 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
500 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 501 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
502 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
503 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
504 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 505 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
506 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
507 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
508 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
509 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
510 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 511 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 512 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 513 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 514 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
66cb45aa | 515 | #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ |
bc58ba94 JA |
516 | |
517 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 518 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
519 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
520 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 521 | |
94eddfbe | 522 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 523 | (1 << QUEUE_FLAG_STACKABLE) | \ |
94eddfbe JA |
524 | (1 << QUEUE_FLAG_SAME_COMP)) |
525 | ||
8bcb6c7d | 526 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 527 | { |
8bcb6c7d AK |
528 | if (q->queue_lock) |
529 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
530 | } |
531 | ||
75ad23bc NP |
532 | static inline void queue_flag_set_unlocked(unsigned int flag, |
533 | struct request_queue *q) | |
534 | { | |
535 | __set_bit(flag, &q->queue_flags); | |
536 | } | |
537 | ||
e48ec690 JA |
538 | static inline int queue_flag_test_and_clear(unsigned int flag, |
539 | struct request_queue *q) | |
540 | { | |
8bcb6c7d | 541 | queue_lockdep_assert_held(q); |
e48ec690 JA |
542 | |
543 | if (test_bit(flag, &q->queue_flags)) { | |
544 | __clear_bit(flag, &q->queue_flags); | |
545 | return 1; | |
546 | } | |
547 | ||
548 | return 0; | |
549 | } | |
550 | ||
551 | static inline int queue_flag_test_and_set(unsigned int flag, | |
552 | struct request_queue *q) | |
553 | { | |
8bcb6c7d | 554 | queue_lockdep_assert_held(q); |
e48ec690 JA |
555 | |
556 | if (!test_bit(flag, &q->queue_flags)) { | |
557 | __set_bit(flag, &q->queue_flags); | |
558 | return 0; | |
559 | } | |
560 | ||
561 | return 1; | |
562 | } | |
563 | ||
75ad23bc NP |
564 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
565 | { | |
8bcb6c7d | 566 | queue_lockdep_assert_held(q); |
75ad23bc NP |
567 | __set_bit(flag, &q->queue_flags); |
568 | } | |
569 | ||
570 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
571 | struct request_queue *q) | |
572 | { | |
573 | __clear_bit(flag, &q->queue_flags); | |
574 | } | |
575 | ||
0a7ae2ff JA |
576 | static inline int queue_in_flight(struct request_queue *q) |
577 | { | |
578 | return q->in_flight[0] + q->in_flight[1]; | |
579 | } | |
580 | ||
75ad23bc NP |
581 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
582 | { | |
8bcb6c7d | 583 | queue_lockdep_assert_held(q); |
75ad23bc NP |
584 | __clear_bit(flag, &q->queue_flags); |
585 | } | |
586 | ||
1da177e4 LT |
587 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
588 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 589 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 590 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 591 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 592 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 593 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
594 | #define blk_queue_noxmerges(q) \ |
595 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 596 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 597 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 598 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
599 | #define blk_queue_stackable(q) \ |
600 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 601 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
602 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
603 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 604 | |
33659ebb CH |
605 | #define blk_noretry_request(rq) \ |
606 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
607 | REQ_FAILFAST_DRIVER)) | |
608 | ||
609 | #define blk_account_rq(rq) \ | |
610 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 611 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 612 | |
1da177e4 | 613 | #define blk_pm_request(rq) \ |
33659ebb CH |
614 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
615 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 616 | |
ab780f1e | 617 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 618 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
619 | /* rq->queuelist of dequeued request must be list_empty() */ |
620 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
621 | |
622 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
623 | ||
5953316d | 624 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 625 | |
49fd524f JA |
626 | /* |
627 | * Driver can handle struct request, if it either has an old style | |
628 | * request_fn defined, or is blk-mq based. | |
629 | */ | |
630 | static inline bool queue_is_rq_based(struct request_queue *q) | |
631 | { | |
632 | return q->request_fn || q->mq_ops; | |
633 | } | |
634 | ||
e692cb66 MP |
635 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
636 | { | |
637 | return q->limits.cluster; | |
638 | } | |
639 | ||
9e2585a8 | 640 | /* |
1faa16d2 | 641 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 642 | */ |
1faa16d2 JA |
643 | static inline bool rw_is_sync(unsigned int rw_flags) |
644 | { | |
7b6d91da | 645 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
646 | } |
647 | ||
648 | static inline bool rq_is_sync(struct request *rq) | |
649 | { | |
650 | return rw_is_sync(rq->cmd_flags); | |
651 | } | |
652 | ||
5b788ce3 | 653 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 654 | { |
5b788ce3 TH |
655 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
656 | ||
657 | return rl->flags & flag; | |
1da177e4 LT |
658 | } |
659 | ||
5b788ce3 | 660 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 661 | { |
5b788ce3 TH |
662 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
663 | ||
664 | rl->flags |= flag; | |
1da177e4 LT |
665 | } |
666 | ||
5b788ce3 | 667 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 668 | { |
5b788ce3 TH |
669 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
670 | ||
671 | rl->flags &= ~flag; | |
1da177e4 LT |
672 | } |
673 | ||
e2a60da7 MP |
674 | static inline bool rq_mergeable(struct request *rq) |
675 | { | |
676 | if (rq->cmd_type != REQ_TYPE_FS) | |
677 | return false; | |
1da177e4 | 678 | |
e2a60da7 MP |
679 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
680 | return false; | |
681 | ||
682 | return true; | |
683 | } | |
1da177e4 | 684 | |
f31dc1cd MP |
685 | static inline bool blk_check_merge_flags(unsigned int flags1, |
686 | unsigned int flags2) | |
687 | { | |
688 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
689 | return false; | |
690 | ||
691 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
692 | return false; | |
693 | ||
4363ac7c MP |
694 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
695 | return false; | |
696 | ||
f31dc1cd MP |
697 | return true; |
698 | } | |
699 | ||
4363ac7c MP |
700 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
701 | { | |
702 | if (bio_data(a) == bio_data(b)) | |
703 | return true; | |
704 | ||
705 | return false; | |
706 | } | |
707 | ||
1da177e4 LT |
708 | /* |
709 | * q->prep_rq_fn return values | |
710 | */ | |
711 | #define BLKPREP_OK 0 /* serve it */ | |
712 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
713 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
714 | ||
715 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
716 | ||
717 | /* | |
718 | * standard bounce addresses: | |
719 | * | |
720 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
721 | * BLK_BOUNCE_ANY : don't bounce anything | |
722 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
723 | */ | |
2472892a AK |
724 | |
725 | #if BITS_PER_LONG == 32 | |
1da177e4 | 726 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
727 | #else |
728 | #define BLK_BOUNCE_HIGH -1ULL | |
729 | #endif | |
730 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 731 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 732 | |
3d6392cf JA |
733 | /* |
734 | * default timeout for SG_IO if none specified | |
735 | */ | |
736 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 737 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 738 | |
2a7326b5 | 739 | #ifdef CONFIG_BOUNCE |
1da177e4 | 740 | extern int init_emergency_isa_pool(void); |
165125e1 | 741 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
742 | #else |
743 | static inline int init_emergency_isa_pool(void) | |
744 | { | |
745 | return 0; | |
746 | } | |
165125e1 | 747 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
748 | { |
749 | } | |
750 | #endif /* CONFIG_MMU */ | |
751 | ||
152e283f FT |
752 | struct rq_map_data { |
753 | struct page **pages; | |
754 | int page_order; | |
755 | int nr_entries; | |
56c451f4 | 756 | unsigned long offset; |
97ae77a1 | 757 | int null_mapped; |
ecb554a8 | 758 | int from_user; |
152e283f FT |
759 | }; |
760 | ||
5705f702 | 761 | struct req_iterator { |
7988613b | 762 | struct bvec_iter iter; |
5705f702 N |
763 | struct bio *bio; |
764 | }; | |
765 | ||
766 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
767 | #define for_each_bio(_bio) \ |
768 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 769 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
770 | if ((rq->bio)) \ |
771 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
772 | ||
5705f702 N |
773 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
774 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 775 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 776 | |
4550dd6c | 777 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 778 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 779 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 780 | |
2d4dc890 IL |
781 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
782 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
783 | #endif | |
784 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
785 | extern void rq_flush_dcache_pages(struct request *rq); | |
786 | #else | |
787 | static inline void rq_flush_dcache_pages(struct request *rq) | |
788 | { | |
789 | } | |
790 | #endif | |
791 | ||
1da177e4 LT |
792 | extern int blk_register_queue(struct gendisk *disk); |
793 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 794 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 795 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 796 | extern void blk_put_request(struct request *); |
165125e1 | 797 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 798 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
799 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
800 | gfp_t); | |
f27b087b | 801 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 802 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
803 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
804 | unsigned int len); | |
82124d60 | 805 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 806 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
807 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
808 | struct bio_set *bs, gfp_t gfp_mask, | |
809 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
810 | void *data); | |
811 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
812 | extern int blk_insert_cloned_request(struct request_queue *q, |
813 | struct request *rq); | |
3cca6dc1 | 814 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 815 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 816 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
817 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
818 | unsigned int, void __user *); | |
74f3c8af AV |
819 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
820 | unsigned int, void __user *); | |
e915e872 AV |
821 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
822 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 823 | |
5a7bbad2 | 824 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 825 | |
3fcfab16 AM |
826 | /* |
827 | * A queue has just exitted congestion. Note this in the global counter of | |
828 | * congested queues, and wake up anyone who was waiting for requests to be | |
829 | * put back. | |
830 | */ | |
8aa7e847 | 831 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 832 | { |
8aa7e847 | 833 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
834 | } |
835 | ||
836 | /* | |
837 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
838 | * state flags and increment the global gounter of congested queues. | |
839 | */ | |
8aa7e847 | 840 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 841 | { |
8aa7e847 | 842 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
843 | } |
844 | ||
165125e1 JA |
845 | extern void blk_start_queue(struct request_queue *q); |
846 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 847 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 848 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 849 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 850 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 851 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 852 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
853 | struct rq_map_data *, void __user *, unsigned long, |
854 | gfp_t); | |
8e5cfc45 | 855 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
856 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
857 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
86d564c8 AV |
858 | struct rq_map_data *, const struct sg_iovec *, |
859 | int, unsigned int, gfp_t); | |
165125e1 | 860 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 861 | struct request *, int); |
165125e1 | 862 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 863 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 864 | |
165125e1 | 865 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 866 | { |
ff9ea323 | 867 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
868 | } |
869 | ||
5efccd17 | 870 | /* |
80a761fd TH |
871 | * blk_rq_pos() : the current sector |
872 | * blk_rq_bytes() : bytes left in the entire request | |
873 | * blk_rq_cur_bytes() : bytes left in the current segment | |
874 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
875 | * blk_rq_sectors() : sectors left in the entire request | |
876 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 877 | */ |
5b93629b TH |
878 | static inline sector_t blk_rq_pos(const struct request *rq) |
879 | { | |
a2dec7b3 | 880 | return rq->__sector; |
2e46e8b2 TH |
881 | } |
882 | ||
883 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
884 | { | |
a2dec7b3 | 885 | return rq->__data_len; |
5b93629b TH |
886 | } |
887 | ||
2e46e8b2 TH |
888 | static inline int blk_rq_cur_bytes(const struct request *rq) |
889 | { | |
890 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
891 | } | |
5efccd17 | 892 | |
80a761fd TH |
893 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
894 | ||
5b93629b TH |
895 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
896 | { | |
2e46e8b2 | 897 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
898 | } |
899 | ||
900 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
901 | { | |
2e46e8b2 | 902 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
903 | } |
904 | ||
f31dc1cd MP |
905 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
906 | unsigned int cmd_flags) | |
907 | { | |
908 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 909 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 910 | |
4363ac7c MP |
911 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
912 | return q->limits.max_write_same_sectors; | |
913 | ||
f31dc1cd MP |
914 | return q->limits.max_sectors; |
915 | } | |
916 | ||
762380ad JA |
917 | /* |
918 | * Return maximum size of a request at given offset. Only valid for | |
919 | * file system requests. | |
920 | */ | |
921 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
922 | sector_t offset) | |
923 | { | |
924 | if (!q->limits.chunk_sectors) | |
736ed4de | 925 | return q->limits.max_sectors; |
762380ad JA |
926 | |
927 | return q->limits.chunk_sectors - | |
928 | (offset & (q->limits.chunk_sectors - 1)); | |
929 | } | |
930 | ||
f31dc1cd MP |
931 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
932 | { | |
933 | struct request_queue *q = rq->q; | |
934 | ||
935 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
936 | return q->limits.max_hw_sectors; | |
937 | ||
762380ad JA |
938 | if (!q->limits.chunk_sectors) |
939 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
940 | ||
941 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), | |
942 | blk_queue_get_max_sectors(q, rq->cmd_flags)); | |
f31dc1cd MP |
943 | } |
944 | ||
75afb352 JN |
945 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
946 | { | |
947 | unsigned int nr_bios = 0; | |
948 | struct bio *bio; | |
949 | ||
950 | __rq_for_each_bio(bio, rq) | |
951 | nr_bios++; | |
952 | ||
953 | return nr_bios; | |
954 | } | |
955 | ||
9934c8c0 TH |
956 | /* |
957 | * Request issue related functions. | |
958 | */ | |
959 | extern struct request *blk_peek_request(struct request_queue *q); | |
960 | extern void blk_start_request(struct request *rq); | |
961 | extern struct request *blk_fetch_request(struct request_queue *q); | |
962 | ||
1da177e4 | 963 | /* |
2e60e022 TH |
964 | * Request completion related functions. |
965 | * | |
966 | * blk_update_request() completes given number of bytes and updates | |
967 | * the request without completing it. | |
968 | * | |
f06d9a2b TH |
969 | * blk_end_request() and friends. __blk_end_request() must be called |
970 | * with the request queue spinlock acquired. | |
1da177e4 LT |
971 | * |
972 | * Several drivers define their own end_request and call | |
3bcddeac KU |
973 | * blk_end_request() for parts of the original function. |
974 | * This prevents code duplication in drivers. | |
1da177e4 | 975 | */ |
2e60e022 TH |
976 | extern bool blk_update_request(struct request *rq, int error, |
977 | unsigned int nr_bytes); | |
12120077 | 978 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
979 | extern bool blk_end_request(struct request *rq, int error, |
980 | unsigned int nr_bytes); | |
981 | extern void blk_end_request_all(struct request *rq, int error); | |
982 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 983 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
984 | extern bool __blk_end_request(struct request *rq, int error, |
985 | unsigned int nr_bytes); | |
986 | extern void __blk_end_request_all(struct request *rq, int error); | |
987 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 988 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 989 | |
ff856bad | 990 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
991 | extern void __blk_complete_request(struct request *); |
992 | extern void blk_abort_request(struct request *); | |
28018c24 | 993 | extern void blk_unprep_request(struct request *); |
ff856bad | 994 | |
1da177e4 LT |
995 | /* |
996 | * Access functions for manipulating queue properties | |
997 | */ | |
165125e1 | 998 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 999 | spinlock_t *lock, int node_id); |
165125e1 | 1000 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
1001 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
1002 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
1003 | extern void blk_cleanup_queue(struct request_queue *); |
1004 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1005 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 1006 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 1007 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1008 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1009 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 1010 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1011 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1012 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1013 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1014 | unsigned int max_write_same_sectors); | |
e1defc4f | 1015 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1016 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1017 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1018 | unsigned int alignment); | |
7c958e32 | 1019 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1020 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1021 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1022 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 1023 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1024 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1025 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1026 | sector_t offset); | |
17be8c24 MP |
1027 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1028 | sector_t offset); | |
c72758f3 MP |
1029 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1030 | sector_t offset); | |
165125e1 | 1031 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1032 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1033 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1034 | extern int blk_queue_dma_drain(struct request_queue *q, |
1035 | dma_drain_needed_fn *dma_drain_needed, | |
1036 | void *buf, unsigned int size); | |
ef9e3fac | 1037 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
1038 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
1039 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 1040 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
1041 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
1042 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 1043 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1044 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1045 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1046 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 1047 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 1048 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 1049 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1050 | |
165125e1 | 1051 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
1052 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
1053 | struct scatterlist *sglist); | |
1da177e4 | 1054 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1055 | extern long nr_blockdev_pages(void); |
1da177e4 | 1056 | |
09ac46c4 | 1057 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1058 | struct request_queue *blk_alloc_queue(gfp_t); |
1059 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1060 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 1061 | |
6c954667 LM |
1062 | /* |
1063 | * block layer runtime pm functions | |
1064 | */ | |
47fafbc7 | 1065 | #ifdef CONFIG_PM |
6c954667 LM |
1066 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1067 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1068 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1069 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1070 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1071 | #else | |
1072 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1073 | struct device *dev) {} | |
1074 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1075 | { | |
1076 | return -ENOSYS; | |
1077 | } | |
1078 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1079 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1080 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1081 | #endif | |
1082 | ||
316cc67d | 1083 | /* |
75df7136 SJ |
1084 | * blk_plug permits building a queue of related requests by holding the I/O |
1085 | * fragments for a short period. This allows merging of sequential requests | |
1086 | * into single larger request. As the requests are moved from a per-task list to | |
1087 | * the device's request_queue in a batch, this results in improved scalability | |
1088 | * as the lock contention for request_queue lock is reduced. | |
1089 | * | |
1090 | * It is ok not to disable preemption when adding the request to the plug list | |
1091 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1092 | * the plug list when the task sleeps by itself. For details, please see | |
1093 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1094 | */ |
73c10101 | 1095 | struct blk_plug { |
75df7136 | 1096 | struct list_head list; /* requests */ |
320ae51f | 1097 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1098 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1099 | }; |
55c022bb SL |
1100 | #define BLK_MAX_REQUEST_COUNT 16 |
1101 | ||
9cbb1750 | 1102 | struct blk_plug_cb; |
74018dc3 | 1103 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1104 | struct blk_plug_cb { |
1105 | struct list_head list; | |
9cbb1750 N |
1106 | blk_plug_cb_fn callback; |
1107 | void *data; | |
048c9374 | 1108 | }; |
9cbb1750 N |
1109 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1110 | void *data, int size); | |
73c10101 JA |
1111 | extern void blk_start_plug(struct blk_plug *); |
1112 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1113 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1114 | |
1115 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1116 | { | |
1117 | struct blk_plug *plug = tsk->plug; | |
1118 | ||
a237c1c5 JA |
1119 | if (plug) |
1120 | blk_flush_plug_list(plug, false); | |
1121 | } | |
1122 | ||
1123 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1124 | { | |
1125 | struct blk_plug *plug = tsk->plug; | |
1126 | ||
88b996cd | 1127 | if (plug) |
f6603783 | 1128 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1129 | } |
1130 | ||
1131 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1132 | { | |
1133 | struct blk_plug *plug = tsk->plug; | |
1134 | ||
320ae51f JA |
1135 | return plug && |
1136 | (!list_empty(&plug->list) || | |
1137 | !list_empty(&plug->mq_list) || | |
1138 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1139 | } |
1140 | ||
1da177e4 LT |
1141 | /* |
1142 | * tag stuff | |
1143 | */ | |
165125e1 JA |
1144 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1145 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1146 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1147 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1148 | extern void blk_queue_free_tags(struct request_queue *); |
1149 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1150 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1151 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1152 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1153 | |
f583f492 DS |
1154 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1155 | int tag) | |
1156 | { | |
1157 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1158 | return NULL; | |
1159 | return bqt->tag_index[tag]; | |
1160 | } | |
dd3932ed CH |
1161 | |
1162 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1163 | ||
1164 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1165 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1166 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1167 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1168 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1169 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1170 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1171 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1172 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1173 | { |
2cf6d26a CH |
1174 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1175 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1176 | gfp_mask, flags); | |
fb2dce86 | 1177 | } |
e6fa0be6 | 1178 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1179 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1180 | { |
1181 | return blkdev_issue_zeroout(sb->s_bdev, | |
1182 | block << (sb->s_blocksize_bits - 9), | |
1183 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1184 | gfp_mask, true); |
e6fa0be6 | 1185 | } |
1da177e4 | 1186 | |
018e0446 | 1187 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1188 | |
eb28d31b MP |
1189 | enum blk_default_limits { |
1190 | BLK_MAX_SEGMENTS = 128, | |
1191 | BLK_SAFE_MAX_SECTORS = 255, | |
eb28d31b MP |
1192 | BLK_MAX_SEGMENT_SIZE = 65536, |
1193 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1194 | }; | |
0e435ac2 | 1195 | |
1da177e4 LT |
1196 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1197 | ||
ae03bf63 MP |
1198 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1199 | { | |
025146e1 | 1200 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1201 | } |
1202 | ||
1203 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1204 | { | |
025146e1 | 1205 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1206 | } |
1207 | ||
1208 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1209 | { | |
025146e1 | 1210 | return q->limits.max_sectors; |
ae03bf63 MP |
1211 | } |
1212 | ||
1213 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1214 | { | |
025146e1 | 1215 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1216 | } |
1217 | ||
8a78362c | 1218 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1219 | { |
8a78362c | 1220 | return q->limits.max_segments; |
ae03bf63 MP |
1221 | } |
1222 | ||
1223 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1224 | { | |
025146e1 | 1225 | return q->limits.max_segment_size; |
ae03bf63 MP |
1226 | } |
1227 | ||
e1defc4f | 1228 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1229 | { |
1230 | int retval = 512; | |
1231 | ||
025146e1 MP |
1232 | if (q && q->limits.logical_block_size) |
1233 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1234 | |
1235 | return retval; | |
1236 | } | |
1237 | ||
e1defc4f | 1238 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1239 | { |
e1defc4f | 1240 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1241 | } |
1242 | ||
c72758f3 MP |
1243 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1244 | { | |
1245 | return q->limits.physical_block_size; | |
1246 | } | |
1247 | ||
892b6f90 | 1248 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1249 | { |
1250 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1251 | } | |
1252 | ||
c72758f3 MP |
1253 | static inline unsigned int queue_io_min(struct request_queue *q) |
1254 | { | |
1255 | return q->limits.io_min; | |
1256 | } | |
1257 | ||
ac481c20 MP |
1258 | static inline int bdev_io_min(struct block_device *bdev) |
1259 | { | |
1260 | return queue_io_min(bdev_get_queue(bdev)); | |
1261 | } | |
1262 | ||
c72758f3 MP |
1263 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1264 | { | |
1265 | return q->limits.io_opt; | |
1266 | } | |
1267 | ||
ac481c20 MP |
1268 | static inline int bdev_io_opt(struct block_device *bdev) |
1269 | { | |
1270 | return queue_io_opt(bdev_get_queue(bdev)); | |
1271 | } | |
1272 | ||
c72758f3 MP |
1273 | static inline int queue_alignment_offset(struct request_queue *q) |
1274 | { | |
ac481c20 | 1275 | if (q->limits.misaligned) |
c72758f3 MP |
1276 | return -1; |
1277 | ||
ac481c20 | 1278 | return q->limits.alignment_offset; |
c72758f3 MP |
1279 | } |
1280 | ||
e03a72e1 | 1281 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1282 | { |
1283 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1284 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1285 | |
b8839b8c | 1286 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1287 | } |
1288 | ||
ac481c20 MP |
1289 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1290 | { | |
1291 | struct request_queue *q = bdev_get_queue(bdev); | |
1292 | ||
1293 | if (q->limits.misaligned) | |
1294 | return -1; | |
1295 | ||
1296 | if (bdev != bdev->bd_contains) | |
1297 | return bdev->bd_part->alignment_offset; | |
1298 | ||
1299 | return q->limits.alignment_offset; | |
1300 | } | |
1301 | ||
86b37281 MP |
1302 | static inline int queue_discard_alignment(struct request_queue *q) |
1303 | { | |
1304 | if (q->limits.discard_misaligned) | |
1305 | return -1; | |
1306 | ||
1307 | return q->limits.discard_alignment; | |
1308 | } | |
1309 | ||
e03a72e1 | 1310 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1311 | { |
59771079 | 1312 | unsigned int alignment, granularity, offset; |
dd3d145d | 1313 | |
a934a00a MP |
1314 | if (!lim->max_discard_sectors) |
1315 | return 0; | |
1316 | ||
59771079 LT |
1317 | /* Why are these in bytes, not sectors? */ |
1318 | alignment = lim->discard_alignment >> 9; | |
1319 | granularity = lim->discard_granularity >> 9; | |
1320 | if (!granularity) | |
1321 | return 0; | |
1322 | ||
1323 | /* Offset of the partition start in 'granularity' sectors */ | |
1324 | offset = sector_div(sector, granularity); | |
1325 | ||
1326 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1327 | offset = (granularity + alignment - offset) % granularity; | |
1328 | ||
1329 | /* Turn it back into bytes, gaah */ | |
1330 | return offset << 9; | |
86b37281 MP |
1331 | } |
1332 | ||
c6e66634 PB |
1333 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1334 | { | |
1335 | struct request_queue *q = bdev_get_queue(bdev); | |
1336 | ||
1337 | if (bdev != bdev->bd_contains) | |
1338 | return bdev->bd_part->discard_alignment; | |
1339 | ||
1340 | return q->limits.discard_alignment; | |
1341 | } | |
1342 | ||
98262f27 MP |
1343 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1344 | { | |
a934a00a | 1345 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1346 | return 1; |
1347 | ||
1348 | return 0; | |
1349 | } | |
1350 | ||
1351 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1352 | { | |
1353 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1354 | } | |
1355 | ||
4363ac7c MP |
1356 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1357 | { | |
1358 | struct request_queue *q = bdev_get_queue(bdev); | |
1359 | ||
1360 | if (q) | |
1361 | return q->limits.max_write_same_sectors; | |
1362 | ||
1363 | return 0; | |
1364 | } | |
1365 | ||
165125e1 | 1366 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1367 | { |
482eb689 | 1368 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1369 | } |
1370 | ||
14417799 | 1371 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1372 | unsigned int len) |
1373 | { | |
1374 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1375 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1376 | } |
1377 | ||
1da177e4 LT |
1378 | /* assumes size > 256 */ |
1379 | static inline unsigned int blksize_bits(unsigned int size) | |
1380 | { | |
1381 | unsigned int bits = 8; | |
1382 | do { | |
1383 | bits++; | |
1384 | size >>= 1; | |
1385 | } while (size > 256); | |
1386 | return bits; | |
1387 | } | |
1388 | ||
2befb9e3 | 1389 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1390 | { |
1391 | return bdev->bd_block_size; | |
1392 | } | |
1393 | ||
f3876930 | 1394 | static inline bool queue_flush_queueable(struct request_queue *q) |
1395 | { | |
1396 | return !q->flush_not_queueable; | |
1397 | } | |
1398 | ||
1da177e4 LT |
1399 | typedef struct {struct page *v;} Sector; |
1400 | ||
1401 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1402 | ||
1403 | static inline void put_dev_sector(Sector p) | |
1404 | { | |
1405 | page_cache_release(p.v); | |
1406 | } | |
1407 | ||
1408 | struct work_struct; | |
59c3d45e JA |
1409 | int kblockd_schedule_work(struct work_struct *work); |
1410 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1411 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1412 | |
9195291e | 1413 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1414 | /* |
1415 | * This should not be using sched_clock(). A real patch is in progress | |
1416 | * to fix this up, until that is in place we need to disable preemption | |
1417 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1418 | */ | |
9195291e DS |
1419 | static inline void set_start_time_ns(struct request *req) |
1420 | { | |
28f4197e | 1421 | preempt_disable(); |
9195291e | 1422 | req->start_time_ns = sched_clock(); |
28f4197e | 1423 | preempt_enable(); |
9195291e DS |
1424 | } |
1425 | ||
1426 | static inline void set_io_start_time_ns(struct request *req) | |
1427 | { | |
28f4197e | 1428 | preempt_disable(); |
9195291e | 1429 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1430 | preempt_enable(); |
9195291e | 1431 | } |
84c124da DS |
1432 | |
1433 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1434 | { | |
1435 | return req->start_time_ns; | |
1436 | } | |
1437 | ||
1438 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1439 | { | |
1440 | return req->io_start_time_ns; | |
1441 | } | |
9195291e DS |
1442 | #else |
1443 | static inline void set_start_time_ns(struct request *req) {} | |
1444 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1445 | static inline uint64_t rq_start_time_ns(struct request *req) |
1446 | { | |
1447 | return 0; | |
1448 | } | |
1449 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1450 | { | |
1451 | return 0; | |
1452 | } | |
9195291e DS |
1453 | #endif |
1454 | ||
1da177e4 LT |
1455 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1456 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1457 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1458 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1459 | ||
7ba1ba12 MP |
1460 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1461 | ||
8288f496 MP |
1462 | enum blk_integrity_flags { |
1463 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1464 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1465 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1466 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1467 | }; |
7ba1ba12 | 1468 | |
18593088 | 1469 | struct blk_integrity_iter { |
7ba1ba12 MP |
1470 | void *prot_buf; |
1471 | void *data_buf; | |
3be91c4a | 1472 | sector_t seed; |
7ba1ba12 | 1473 | unsigned int data_size; |
3be91c4a | 1474 | unsigned short interval; |
7ba1ba12 MP |
1475 | const char *disk_name; |
1476 | }; | |
1477 | ||
18593088 | 1478 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 MP |
1479 | |
1480 | struct blk_integrity { | |
18593088 MP |
1481 | integrity_processing_fn *generate_fn; |
1482 | integrity_processing_fn *verify_fn; | |
7ba1ba12 MP |
1483 | |
1484 | unsigned short flags; | |
1485 | unsigned short tuple_size; | |
3be91c4a | 1486 | unsigned short interval; |
7ba1ba12 MP |
1487 | unsigned short tag_size; |
1488 | ||
1489 | const char *name; | |
1490 | ||
1491 | struct kobject kobj; | |
1492 | }; | |
1493 | ||
a63a5cf8 | 1494 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1495 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1496 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1497 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1498 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1499 | struct scatterlist *); | |
1500 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1501 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1502 | struct request *); | |
1503 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1504 | struct bio *); | |
7ba1ba12 | 1505 | |
b04accc4 JA |
1506 | static inline |
1507 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1508 | { | |
1509 | return bdev->bd_disk->integrity; | |
1510 | } | |
1511 | ||
b02739b0 MP |
1512 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1513 | { | |
1514 | return disk->integrity; | |
1515 | } | |
1516 | ||
180b2f95 | 1517 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1518 | { |
180b2f95 | 1519 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1520 | } |
1521 | ||
13f05c8d MP |
1522 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1523 | unsigned int segs) | |
1524 | { | |
1525 | q->limits.max_integrity_segments = segs; | |
1526 | } | |
1527 | ||
1528 | static inline unsigned short | |
1529 | queue_max_integrity_segments(struct request_queue *q) | |
1530 | { | |
1531 | return q->limits.max_integrity_segments; | |
1532 | } | |
1533 | ||
7ba1ba12 MP |
1534 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1535 | ||
fd83240a SR |
1536 | struct bio; |
1537 | struct block_device; | |
1538 | struct gendisk; | |
1539 | struct blk_integrity; | |
1540 | ||
1541 | static inline int blk_integrity_rq(struct request *rq) | |
1542 | { | |
1543 | return 0; | |
1544 | } | |
1545 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1546 | struct bio *b) | |
1547 | { | |
1548 | return 0; | |
1549 | } | |
1550 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1551 | struct bio *b, | |
1552 | struct scatterlist *s) | |
1553 | { | |
1554 | return 0; | |
1555 | } | |
1556 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1557 | { | |
61a04e5b | 1558 | return NULL; |
fd83240a SR |
1559 | } |
1560 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1561 | { | |
1562 | return NULL; | |
1563 | } | |
1564 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1565 | { | |
1566 | return 0; | |
1567 | } | |
1568 | static inline int blk_integrity_register(struct gendisk *d, | |
1569 | struct blk_integrity *b) | |
1570 | { | |
1571 | return 0; | |
1572 | } | |
1573 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1574 | { | |
1575 | } | |
1576 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1577 | unsigned int segs) | |
1578 | { | |
1579 | } | |
1580 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1581 | { | |
1582 | return 0; | |
1583 | } | |
4eaf99be MP |
1584 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1585 | struct request *r1, | |
1586 | struct request *r2) | |
fd83240a | 1587 | { |
cb1a5ab6 | 1588 | return true; |
fd83240a | 1589 | } |
4eaf99be MP |
1590 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1591 | struct request *r, | |
1592 | struct bio *b) | |
fd83240a | 1593 | { |
cb1a5ab6 | 1594 | return true; |
fd83240a SR |
1595 | } |
1596 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1597 | { | |
1598 | return 0; | |
1599 | } | |
7ba1ba12 MP |
1600 | |
1601 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1602 | ||
08f85851 | 1603 | struct block_device_operations { |
d4430d62 | 1604 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1605 | void (*release) (struct gendisk *, fmode_t); |
47a191fd | 1606 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
d4430d62 AV |
1607 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1608 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
dd22f551 MW |
1609 | long (*direct_access)(struct block_device *, sector_t, |
1610 | void **, unsigned long *pfn, long size); | |
77ea887e TH |
1611 | unsigned int (*check_events) (struct gendisk *disk, |
1612 | unsigned int clearing); | |
1613 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1614 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1615 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1616 | int (*revalidate_disk) (struct gendisk *); |
1617 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1618 | /* this callback is with swap_lock and sometimes page table lock held */ |
1619 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1620 | struct module *owner; |
1621 | }; | |
1622 | ||
633a08b8 AV |
1623 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1624 | unsigned long); | |
47a191fd MW |
1625 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1626 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1627 | struct writeback_control *); | |
dd22f551 MW |
1628 | extern long bdev_direct_access(struct block_device *, sector_t, void **addr, |
1629 | unsigned long *pfn, long size); | |
9361401e | 1630 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1631 | |
1632 | struct block_device; | |
1633 | ||
9361401e DH |
1634 | /* |
1635 | * stubs for when the block layer is configured out | |
1636 | */ | |
1637 | #define buffer_heads_over_limit 0 | |
1638 | ||
9361401e DH |
1639 | static inline long nr_blockdev_pages(void) |
1640 | { | |
1641 | return 0; | |
1642 | } | |
1643 | ||
1f940bdf JA |
1644 | struct blk_plug { |
1645 | }; | |
1646 | ||
1647 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1648 | { |
1649 | } | |
1650 | ||
1f940bdf | 1651 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1652 | { |
1653 | } | |
1654 | ||
1f940bdf | 1655 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1656 | { |
1657 | } | |
1658 | ||
a237c1c5 JA |
1659 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1660 | { | |
1661 | } | |
1662 | ||
1663 | ||
73c10101 JA |
1664 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1665 | { | |
1666 | return false; | |
1667 | } | |
1668 | ||
ac13a829 FF |
1669 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1670 | sector_t *error_sector) | |
1671 | { | |
1672 | return 0; | |
1673 | } | |
1674 | ||
9361401e DH |
1675 | #endif /* CONFIG_BLOCK */ |
1676 | ||
1da177e4 | 1677 | #endif |