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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; |
1da177e4 LT |
39 | |
40 | #define BLKDEV_MIN_RQ 4 | |
41 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
42 | ||
8bd435b3 TH |
43 | /* |
44 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
45 | * Defined here to simplify include dependency. | |
46 | */ | |
47 | #define BLKCG_MAX_POLS 2 | |
48 | ||
1da177e4 | 49 | struct request; |
8ffdc655 | 50 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 51 | |
5b788ce3 TH |
52 | #define BLK_RL_SYNCFULL (1U << 0) |
53 | #define BLK_RL_ASYNCFULL (1U << 1) | |
54 | ||
1da177e4 | 55 | struct request_list { |
5b788ce3 | 56 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
57 | #ifdef CONFIG_BLK_CGROUP |
58 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
59 | #endif | |
1faa16d2 JA |
60 | /* |
61 | * count[], starved[], and wait[] are indexed by | |
62 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
63 | */ | |
8a5ecdd4 TH |
64 | int count[2]; |
65 | int starved[2]; | |
66 | mempool_t *rq_pool; | |
67 | wait_queue_head_t wait[2]; | |
5b788ce3 | 68 | unsigned int flags; |
1da177e4 LT |
69 | }; |
70 | ||
4aff5e23 JA |
71 | /* |
72 | * request command types | |
73 | */ | |
74 | enum rq_cmd_type_bits { | |
75 | REQ_TYPE_FS = 1, /* fs request */ | |
76 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
77 | REQ_TYPE_SENSE, /* sense request */ | |
78 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
79 | REQ_TYPE_PM_RESUME, /* resume request */ | |
80 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 81 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
82 | /* |
83 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
84 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
85 | * private REQ_LB opcodes to differentiate what type of request this is | |
86 | */ | |
4aff5e23 | 87 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 88 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
89 | }; |
90 | ||
1da177e4 LT |
91 | #define BLK_MAX_CDB 16 |
92 | ||
93 | /* | |
af76e555 CH |
94 | * Try to put the fields that are referenced together in the same cacheline. |
95 | * | |
96 | * If you modify this structure, make sure to update blk_rq_init() and | |
97 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
98 | */ |
99 | struct request { | |
6897fc22 | 100 | struct list_head queuelist; |
320ae51f JA |
101 | union { |
102 | struct call_single_data csd; | |
8b4922d3 | 103 | unsigned long fifo_time; |
320ae51f | 104 | }; |
ff856bad | 105 | |
165125e1 | 106 | struct request_queue *q; |
320ae51f | 107 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 108 | |
5953316d | 109 | u64 cmd_flags; |
4aff5e23 | 110 | enum rq_cmd_type_bits cmd_type; |
242f9dcb | 111 | unsigned long atomic_flags; |
1da177e4 | 112 | |
181fdde3 RK |
113 | int cpu; |
114 | ||
a2dec7b3 | 115 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 116 | unsigned int __data_len; /* total data len */ |
181fdde3 | 117 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
118 | |
119 | struct bio *bio; | |
120 | struct bio *biotail; | |
121 | ||
360f92c2 JA |
122 | /* |
123 | * The hash is used inside the scheduler, and killed once the | |
124 | * request reaches the dispatch list. The ipi_list is only used | |
125 | * to queue the request for softirq completion, which is long | |
126 | * after the request has been unhashed (and even removed from | |
127 | * the dispatch list). | |
128 | */ | |
129 | union { | |
130 | struct hlist_node hash; /* merge hash */ | |
131 | struct list_head ipi_list; | |
132 | }; | |
133 | ||
e6a1c874 JA |
134 | /* |
135 | * The rb_node is only used inside the io scheduler, requests | |
136 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 137 | * completion_data share space with the rb_node. |
e6a1c874 JA |
138 | */ |
139 | union { | |
140 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 141 | void *completion_data; |
e6a1c874 | 142 | }; |
9817064b | 143 | |
ff7d145f | 144 | /* |
7f1dc8a2 | 145 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
146 | * more they have to dynamically allocate it. Flush requests are |
147 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 148 | * space with the elevator data. |
ff7d145f | 149 | */ |
c186794d | 150 | union { |
a612fddf TH |
151 | struct { |
152 | struct io_cq *icq; | |
153 | void *priv[2]; | |
154 | } elv; | |
155 | ||
c186794d MS |
156 | struct { |
157 | unsigned int seq; | |
158 | struct list_head list; | |
4853abaa | 159 | rq_end_io_fn *saved_end_io; |
c186794d MS |
160 | } flush; |
161 | }; | |
ff7d145f | 162 | |
8f34ee75 | 163 | struct gendisk *rq_disk; |
09e099d4 | 164 | struct hd_struct *part; |
1da177e4 | 165 | unsigned long start_time; |
9195291e | 166 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 167 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
168 | unsigned long long start_time_ns; |
169 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
170 | #endif | |
1da177e4 LT |
171 | /* Number of scatter-gather DMA addr+len pairs after |
172 | * physical address coalescing is performed. | |
173 | */ | |
174 | unsigned short nr_phys_segments; | |
13f05c8d MP |
175 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
176 | unsigned short nr_integrity_segments; | |
177 | #endif | |
1da177e4 | 178 | |
8f34ee75 JA |
179 | unsigned short ioprio; |
180 | ||
731ec497 | 181 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 182 | |
cdd60262 JA |
183 | int tag; |
184 | int errors; | |
185 | ||
1da177e4 LT |
186 | /* |
187 | * when request is used as a packet command carrier | |
188 | */ | |
d7e3c324 FT |
189 | unsigned char __cmd[BLK_MAX_CDB]; |
190 | unsigned char *cmd; | |
181fdde3 | 191 | unsigned short cmd_len; |
1da177e4 | 192 | |
7a85f889 | 193 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 194 | unsigned int sense_len; |
c3a4d78c | 195 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
196 | void *sense; |
197 | ||
242f9dcb JA |
198 | unsigned long deadline; |
199 | struct list_head timeout_list; | |
1da177e4 | 200 | unsigned int timeout; |
17e01f21 | 201 | int retries; |
1da177e4 | 202 | |
1da177e4 | 203 | /* |
c00895ab | 204 | * completion callback. |
1da177e4 LT |
205 | */ |
206 | rq_end_io_fn *end_io; | |
207 | void *end_io_data; | |
abae1fde FT |
208 | |
209 | /* for bidi */ | |
210 | struct request *next_rq; | |
1da177e4 LT |
211 | }; |
212 | ||
766ca442 FLVC |
213 | static inline unsigned short req_get_ioprio(struct request *req) |
214 | { | |
215 | return req->ioprio; | |
216 | } | |
217 | ||
1da177e4 | 218 | /* |
4aff5e23 | 219 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
220 | * requests. Some step values could eventually be made generic. |
221 | */ | |
222 | struct request_pm_state | |
223 | { | |
224 | /* PM state machine step value, currently driver specific */ | |
225 | int pm_step; | |
226 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
227 | u32 pm_state; | |
228 | void* data; /* for driver use */ | |
229 | }; | |
230 | ||
231 | #include <linux/elevator.h> | |
232 | ||
320ae51f JA |
233 | struct blk_queue_ctx; |
234 | ||
165125e1 | 235 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 236 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 237 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 238 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
239 | |
240 | struct bio_vec; | |
cc371e66 AK |
241 | struct bvec_merge_data { |
242 | struct block_device *bi_bdev; | |
243 | sector_t bi_sector; | |
244 | unsigned bi_size; | |
245 | unsigned long bi_rw; | |
246 | }; | |
247 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
248 | struct bio_vec *); | |
ff856bad | 249 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 250 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 251 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 252 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 253 | |
242f9dcb JA |
254 | enum blk_eh_timer_return { |
255 | BLK_EH_NOT_HANDLED, | |
256 | BLK_EH_HANDLED, | |
257 | BLK_EH_RESET_TIMER, | |
258 | }; | |
259 | ||
260 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
261 | ||
1da177e4 LT |
262 | enum blk_queue_state { |
263 | Queue_down, | |
264 | Queue_up, | |
265 | }; | |
266 | ||
1da177e4 LT |
267 | struct blk_queue_tag { |
268 | struct request **tag_index; /* map of busy tags */ | |
269 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
270 | int busy; /* current depth */ |
271 | int max_depth; /* what we will send to device */ | |
ba025082 | 272 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
273 | atomic_t refcnt; /* map can be shared */ |
274 | }; | |
275 | ||
abf54393 FT |
276 | #define BLK_SCSI_MAX_CMDS (256) |
277 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
278 | ||
025146e1 MP |
279 | struct queue_limits { |
280 | unsigned long bounce_pfn; | |
281 | unsigned long seg_boundary_mask; | |
282 | ||
283 | unsigned int max_hw_sectors; | |
762380ad | 284 | unsigned int chunk_sectors; |
025146e1 MP |
285 | unsigned int max_sectors; |
286 | unsigned int max_segment_size; | |
c72758f3 MP |
287 | unsigned int physical_block_size; |
288 | unsigned int alignment_offset; | |
289 | unsigned int io_min; | |
290 | unsigned int io_opt; | |
67efc925 | 291 | unsigned int max_discard_sectors; |
4363ac7c | 292 | unsigned int max_write_same_sectors; |
86b37281 MP |
293 | unsigned int discard_granularity; |
294 | unsigned int discard_alignment; | |
025146e1 MP |
295 | |
296 | unsigned short logical_block_size; | |
8a78362c | 297 | unsigned short max_segments; |
13f05c8d | 298 | unsigned short max_integrity_segments; |
025146e1 | 299 | |
c72758f3 | 300 | unsigned char misaligned; |
86b37281 | 301 | unsigned char discard_misaligned; |
e692cb66 | 302 | unsigned char cluster; |
a934a00a | 303 | unsigned char discard_zeroes_data; |
c78afc62 | 304 | unsigned char raid_partial_stripes_expensive; |
025146e1 MP |
305 | }; |
306 | ||
d7b76301 | 307 | struct request_queue { |
1da177e4 LT |
308 | /* |
309 | * Together with queue_head for cacheline sharing | |
310 | */ | |
311 | struct list_head queue_head; | |
312 | struct request *last_merge; | |
b374d18a | 313 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
314 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
315 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
316 | |
317 | /* | |
a051661c TH |
318 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
319 | * is used, root blkg allocates from @q->root_rl and all other | |
320 | * blkgs from their own blkg->rl. Which one to use should be | |
321 | * determined using bio_request_list(). | |
1da177e4 | 322 | */ |
a051661c | 323 | struct request_list root_rl; |
1da177e4 LT |
324 | |
325 | request_fn_proc *request_fn; | |
1da177e4 LT |
326 | make_request_fn *make_request_fn; |
327 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 328 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 329 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 330 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 331 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 332 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 333 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 334 | |
320ae51f JA |
335 | struct blk_mq_ops *mq_ops; |
336 | ||
337 | unsigned int *mq_map; | |
338 | ||
339 | /* sw queues */ | |
e6cdb092 | 340 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
341 | unsigned int nr_queues; |
342 | ||
343 | /* hw dispatch queues */ | |
344 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
345 | unsigned int nr_hw_queues; | |
346 | ||
8922e16c TH |
347 | /* |
348 | * Dispatch queue sorting | |
349 | */ | |
1b47f531 | 350 | sector_t end_sector; |
8922e16c | 351 | struct request *boundary_rq; |
8922e16c | 352 | |
1da177e4 | 353 | /* |
3cca6dc1 | 354 | * Delayed queue handling |
1da177e4 | 355 | */ |
3cca6dc1 | 356 | struct delayed_work delay_work; |
1da177e4 LT |
357 | |
358 | struct backing_dev_info backing_dev_info; | |
359 | ||
360 | /* | |
361 | * The queue owner gets to use this for whatever they like. | |
362 | * ll_rw_blk doesn't touch it. | |
363 | */ | |
364 | void *queuedata; | |
365 | ||
1da177e4 | 366 | /* |
d7b76301 | 367 | * various queue flags, see QUEUE_* below |
1da177e4 | 368 | */ |
d7b76301 | 369 | unsigned long queue_flags; |
1da177e4 | 370 | |
a73f730d TH |
371 | /* |
372 | * ida allocated id for this queue. Used to index queues from | |
373 | * ioctx. | |
374 | */ | |
375 | int id; | |
376 | ||
1da177e4 | 377 | /* |
d7b76301 | 378 | * queue needs bounce pages for pages above this limit |
1da177e4 | 379 | */ |
d7b76301 | 380 | gfp_t bounce_gfp; |
1da177e4 LT |
381 | |
382 | /* | |
152587de JA |
383 | * protects queue structures from reentrancy. ->__queue_lock should |
384 | * _never_ be used directly, it is queue private. always use | |
385 | * ->queue_lock. | |
1da177e4 | 386 | */ |
152587de | 387 | spinlock_t __queue_lock; |
1da177e4 LT |
388 | spinlock_t *queue_lock; |
389 | ||
390 | /* | |
391 | * queue kobject | |
392 | */ | |
393 | struct kobject kobj; | |
394 | ||
320ae51f JA |
395 | /* |
396 | * mq queue kobject | |
397 | */ | |
398 | struct kobject mq_kobj; | |
399 | ||
6c954667 LM |
400 | #ifdef CONFIG_PM_RUNTIME |
401 | struct device *dev; | |
402 | int rpm_status; | |
403 | unsigned int nr_pending; | |
404 | #endif | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * queue settings | |
408 | */ | |
409 | unsigned long nr_requests; /* Max # of requests */ | |
410 | unsigned int nr_congestion_on; | |
411 | unsigned int nr_congestion_off; | |
412 | unsigned int nr_batching; | |
413 | ||
fa0ccd83 | 414 | unsigned int dma_drain_size; |
d7b76301 | 415 | void *dma_drain_buffer; |
e3790c7d | 416 | unsigned int dma_pad_mask; |
1da177e4 LT |
417 | unsigned int dma_alignment; |
418 | ||
419 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 420 | struct list_head tag_busy_list; |
1da177e4 | 421 | |
15853af9 | 422 | unsigned int nr_sorted; |
0a7ae2ff | 423 | unsigned int in_flight[2]; |
24faf6f6 BVA |
424 | /* |
425 | * Number of active block driver functions for which blk_drain_queue() | |
426 | * must wait. Must be incremented around functions that unlock the | |
427 | * queue_lock internally, e.g. scsi_request_fn(). | |
428 | */ | |
429 | unsigned int request_fn_active; | |
1da177e4 | 430 | |
242f9dcb JA |
431 | unsigned int rq_timeout; |
432 | struct timer_list timeout; | |
433 | struct list_head timeout_list; | |
434 | ||
a612fddf | 435 | struct list_head icq_list; |
4eef3049 | 436 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 437 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 438 | struct blkcg_gq *root_blkg; |
03aa264a | 439 | struct list_head blkg_list; |
4eef3049 | 440 | #endif |
a612fddf | 441 | |
025146e1 MP |
442 | struct queue_limits limits; |
443 | ||
1da177e4 LT |
444 | /* |
445 | * sg stuff | |
446 | */ | |
447 | unsigned int sg_timeout; | |
448 | unsigned int sg_reserved_size; | |
1946089a | 449 | int node; |
6c5c9341 | 450 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 451 | struct blk_trace *blk_trace; |
6c5c9341 | 452 | #endif |
1da177e4 | 453 | /* |
4913efe4 | 454 | * for flush operations |
1da177e4 | 455 | */ |
4913efe4 | 456 | unsigned int flush_flags; |
f3876930 | 457 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 458 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
459 | unsigned int flush_pending_idx:1; |
460 | unsigned int flush_running_idx:1; | |
461 | unsigned long flush_pending_since; | |
462 | struct list_head flush_queue[2]; | |
463 | struct list_head flush_data_in_flight; | |
18741986 CH |
464 | struct request *flush_rq; |
465 | spinlock_t mq_flush_lock; | |
483f4afc | 466 | |
6fca6a61 CH |
467 | struct list_head requeue_list; |
468 | spinlock_t requeue_lock; | |
469 | struct work_struct requeue_work; | |
470 | ||
483f4afc | 471 | struct mutex sysfs_lock; |
d351af01 | 472 | |
d732580b | 473 | int bypass_depth; |
780db207 | 474 | int mq_freeze_depth; |
d732580b | 475 | |
d351af01 | 476 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
477 | bsg_job_fn *bsg_job_fn; |
478 | int bsg_job_size; | |
d351af01 FT |
479 | struct bsg_class_device bsg_dev; |
480 | #endif | |
e43473b7 VG |
481 | |
482 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
483 | /* Throttle data */ | |
484 | struct throtl_data *td; | |
485 | #endif | |
548bc8e1 | 486 | struct rcu_head rcu_head; |
320ae51f | 487 | wait_queue_head_t mq_freeze_wq; |
add703fd | 488 | struct percpu_ref mq_usage_counter; |
320ae51f | 489 | struct list_head all_q_node; |
0d2602ca JA |
490 | |
491 | struct blk_mq_tag_set *tag_set; | |
492 | struct list_head tag_set_list; | |
1da177e4 LT |
493 | }; |
494 | ||
1da177e4 LT |
495 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
496 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
497 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
498 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 499 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 500 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
501 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
502 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 503 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
504 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
505 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
506 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 507 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
508 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
509 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
510 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
511 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
512 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 513 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 514 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 515 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 516 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
66cb45aa | 517 | #define QUEUE_FLAG_SG_GAPS 22 /* queue doesn't support SG gaps */ |
bc58ba94 JA |
518 | |
519 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 520 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
521 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
522 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 523 | |
94eddfbe JA |
524 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
525 | (1 << QUEUE_FLAG_SAME_COMP)) | |
526 | ||
8bcb6c7d | 527 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 528 | { |
8bcb6c7d AK |
529 | if (q->queue_lock) |
530 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
531 | } |
532 | ||
75ad23bc NP |
533 | static inline void queue_flag_set_unlocked(unsigned int flag, |
534 | struct request_queue *q) | |
535 | { | |
536 | __set_bit(flag, &q->queue_flags); | |
537 | } | |
538 | ||
e48ec690 JA |
539 | static inline int queue_flag_test_and_clear(unsigned int flag, |
540 | struct request_queue *q) | |
541 | { | |
8bcb6c7d | 542 | queue_lockdep_assert_held(q); |
e48ec690 JA |
543 | |
544 | if (test_bit(flag, &q->queue_flags)) { | |
545 | __clear_bit(flag, &q->queue_flags); | |
546 | return 1; | |
547 | } | |
548 | ||
549 | return 0; | |
550 | } | |
551 | ||
552 | static inline int queue_flag_test_and_set(unsigned int flag, | |
553 | struct request_queue *q) | |
554 | { | |
8bcb6c7d | 555 | queue_lockdep_assert_held(q); |
e48ec690 JA |
556 | |
557 | if (!test_bit(flag, &q->queue_flags)) { | |
558 | __set_bit(flag, &q->queue_flags); | |
559 | return 0; | |
560 | } | |
561 | ||
562 | return 1; | |
563 | } | |
564 | ||
75ad23bc NP |
565 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
566 | { | |
8bcb6c7d | 567 | queue_lockdep_assert_held(q); |
75ad23bc NP |
568 | __set_bit(flag, &q->queue_flags); |
569 | } | |
570 | ||
571 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
572 | struct request_queue *q) | |
573 | { | |
574 | __clear_bit(flag, &q->queue_flags); | |
575 | } | |
576 | ||
0a7ae2ff JA |
577 | static inline int queue_in_flight(struct request_queue *q) |
578 | { | |
579 | return q->in_flight[0] + q->in_flight[1]; | |
580 | } | |
581 | ||
75ad23bc NP |
582 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
583 | { | |
8bcb6c7d | 584 | queue_lockdep_assert_held(q); |
75ad23bc NP |
585 | __clear_bit(flag, &q->queue_flags); |
586 | } | |
587 | ||
1da177e4 LT |
588 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
589 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 590 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 591 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 592 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 593 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 594 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
595 | #define blk_queue_noxmerges(q) \ |
596 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 597 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 598 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 599 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
600 | #define blk_queue_stackable(q) \ |
601 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 602 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
603 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
604 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 605 | |
33659ebb CH |
606 | #define blk_noretry_request(rq) \ |
607 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
608 | REQ_FAILFAST_DRIVER)) | |
609 | ||
610 | #define blk_account_rq(rq) \ | |
611 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 612 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 613 | |
1da177e4 | 614 | #define blk_pm_request(rq) \ |
33659ebb CH |
615 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
616 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 617 | |
ab780f1e | 618 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 619 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
620 | /* rq->queuelist of dequeued request must be list_empty() */ |
621 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
622 | |
623 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
624 | ||
5953316d | 625 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 626 | |
49fd524f JA |
627 | /* |
628 | * Driver can handle struct request, if it either has an old style | |
629 | * request_fn defined, or is blk-mq based. | |
630 | */ | |
631 | static inline bool queue_is_rq_based(struct request_queue *q) | |
632 | { | |
633 | return q->request_fn || q->mq_ops; | |
634 | } | |
635 | ||
e692cb66 MP |
636 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
637 | { | |
638 | return q->limits.cluster; | |
639 | } | |
640 | ||
9e2585a8 | 641 | /* |
1faa16d2 | 642 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 643 | */ |
1faa16d2 JA |
644 | static inline bool rw_is_sync(unsigned int rw_flags) |
645 | { | |
7b6d91da | 646 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
647 | } |
648 | ||
649 | static inline bool rq_is_sync(struct request *rq) | |
650 | { | |
651 | return rw_is_sync(rq->cmd_flags); | |
652 | } | |
653 | ||
5b788ce3 | 654 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 655 | { |
5b788ce3 TH |
656 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
657 | ||
658 | return rl->flags & flag; | |
1da177e4 LT |
659 | } |
660 | ||
5b788ce3 | 661 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 662 | { |
5b788ce3 TH |
663 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
664 | ||
665 | rl->flags |= flag; | |
1da177e4 LT |
666 | } |
667 | ||
5b788ce3 | 668 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 669 | { |
5b788ce3 TH |
670 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
671 | ||
672 | rl->flags &= ~flag; | |
1da177e4 LT |
673 | } |
674 | ||
e2a60da7 MP |
675 | static inline bool rq_mergeable(struct request *rq) |
676 | { | |
677 | if (rq->cmd_type != REQ_TYPE_FS) | |
678 | return false; | |
1da177e4 | 679 | |
e2a60da7 MP |
680 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
681 | return false; | |
682 | ||
683 | return true; | |
684 | } | |
1da177e4 | 685 | |
f31dc1cd MP |
686 | static inline bool blk_check_merge_flags(unsigned int flags1, |
687 | unsigned int flags2) | |
688 | { | |
689 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
690 | return false; | |
691 | ||
692 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
693 | return false; | |
694 | ||
4363ac7c MP |
695 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
696 | return false; | |
697 | ||
f31dc1cd MP |
698 | return true; |
699 | } | |
700 | ||
4363ac7c MP |
701 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
702 | { | |
703 | if (bio_data(a) == bio_data(b)) | |
704 | return true; | |
705 | ||
706 | return false; | |
707 | } | |
708 | ||
1da177e4 LT |
709 | /* |
710 | * q->prep_rq_fn return values | |
711 | */ | |
712 | #define BLKPREP_OK 0 /* serve it */ | |
713 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
714 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
715 | ||
716 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
717 | ||
718 | /* | |
719 | * standard bounce addresses: | |
720 | * | |
721 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
722 | * BLK_BOUNCE_ANY : don't bounce anything | |
723 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
724 | */ | |
2472892a AK |
725 | |
726 | #if BITS_PER_LONG == 32 | |
1da177e4 | 727 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
728 | #else |
729 | #define BLK_BOUNCE_HIGH -1ULL | |
730 | #endif | |
731 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 732 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 733 | |
3d6392cf JA |
734 | /* |
735 | * default timeout for SG_IO if none specified | |
736 | */ | |
737 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 738 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 739 | |
2a7326b5 | 740 | #ifdef CONFIG_BOUNCE |
1da177e4 | 741 | extern int init_emergency_isa_pool(void); |
165125e1 | 742 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
743 | #else |
744 | static inline int init_emergency_isa_pool(void) | |
745 | { | |
746 | return 0; | |
747 | } | |
165125e1 | 748 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
749 | { |
750 | } | |
751 | #endif /* CONFIG_MMU */ | |
752 | ||
152e283f FT |
753 | struct rq_map_data { |
754 | struct page **pages; | |
755 | int page_order; | |
756 | int nr_entries; | |
56c451f4 | 757 | unsigned long offset; |
97ae77a1 | 758 | int null_mapped; |
ecb554a8 | 759 | int from_user; |
152e283f FT |
760 | }; |
761 | ||
5705f702 | 762 | struct req_iterator { |
7988613b | 763 | struct bvec_iter iter; |
5705f702 N |
764 | struct bio *bio; |
765 | }; | |
766 | ||
767 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
768 | #define for_each_bio(_bio) \ |
769 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 770 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
771 | if ((rq->bio)) \ |
772 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
773 | ||
5705f702 N |
774 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
775 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 776 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 777 | |
4550dd6c | 778 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 779 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 780 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 781 | |
2d4dc890 IL |
782 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
783 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
784 | #endif | |
785 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
786 | extern void rq_flush_dcache_pages(struct request *rq); | |
787 | #else | |
788 | static inline void rq_flush_dcache_pages(struct request *rq) | |
789 | { | |
790 | } | |
791 | #endif | |
792 | ||
1da177e4 LT |
793 | extern int blk_register_queue(struct gendisk *disk); |
794 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 795 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 796 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 797 | extern void blk_put_request(struct request *); |
165125e1 | 798 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 799 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
800 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
801 | gfp_t); | |
f27b087b | 802 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 803 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
804 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
805 | unsigned int len); | |
82124d60 | 806 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 807 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
808 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
809 | struct bio_set *bs, gfp_t gfp_mask, | |
810 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
811 | void *data); | |
812 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
813 | extern int blk_insert_cloned_request(struct request_queue *q, |
814 | struct request *rq); | |
3cca6dc1 | 815 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 816 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 817 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
818 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
819 | unsigned int, void __user *); | |
74f3c8af AV |
820 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
821 | unsigned int, void __user *); | |
e915e872 AV |
822 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
823 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 824 | |
5a7bbad2 | 825 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 826 | |
3fcfab16 AM |
827 | /* |
828 | * A queue has just exitted congestion. Note this in the global counter of | |
829 | * congested queues, and wake up anyone who was waiting for requests to be | |
830 | * put back. | |
831 | */ | |
8aa7e847 | 832 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 833 | { |
8aa7e847 | 834 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
835 | } |
836 | ||
837 | /* | |
838 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
839 | * state flags and increment the global gounter of congested queues. | |
840 | */ | |
8aa7e847 | 841 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 842 | { |
8aa7e847 | 843 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
844 | } |
845 | ||
165125e1 JA |
846 | extern void blk_start_queue(struct request_queue *q); |
847 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 848 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 849 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 850 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 851 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 852 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 853 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
854 | struct rq_map_data *, void __user *, unsigned long, |
855 | gfp_t); | |
8e5cfc45 | 856 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
857 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
858 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
86d564c8 AV |
859 | struct rq_map_data *, const struct sg_iovec *, |
860 | int, unsigned int, gfp_t); | |
165125e1 | 861 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 862 | struct request *, int); |
165125e1 | 863 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 864 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 865 | |
165125e1 | 866 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
867 | { |
868 | return bdev->bd_disk->queue; | |
869 | } | |
870 | ||
5efccd17 | 871 | /* |
80a761fd TH |
872 | * blk_rq_pos() : the current sector |
873 | * blk_rq_bytes() : bytes left in the entire request | |
874 | * blk_rq_cur_bytes() : bytes left in the current segment | |
875 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
876 | * blk_rq_sectors() : sectors left in the entire request | |
877 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 878 | */ |
5b93629b TH |
879 | static inline sector_t blk_rq_pos(const struct request *rq) |
880 | { | |
a2dec7b3 | 881 | return rq->__sector; |
2e46e8b2 TH |
882 | } |
883 | ||
884 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
885 | { | |
a2dec7b3 | 886 | return rq->__data_len; |
5b93629b TH |
887 | } |
888 | ||
2e46e8b2 TH |
889 | static inline int blk_rq_cur_bytes(const struct request *rq) |
890 | { | |
891 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
892 | } | |
5efccd17 | 893 | |
80a761fd TH |
894 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
895 | ||
5b93629b TH |
896 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
897 | { | |
2e46e8b2 | 898 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
899 | } |
900 | ||
901 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
902 | { | |
2e46e8b2 | 903 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
904 | } |
905 | ||
f31dc1cd MP |
906 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
907 | unsigned int cmd_flags) | |
908 | { | |
909 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 910 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 911 | |
4363ac7c MP |
912 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
913 | return q->limits.max_write_same_sectors; | |
914 | ||
f31dc1cd MP |
915 | return q->limits.max_sectors; |
916 | } | |
917 | ||
762380ad JA |
918 | /* |
919 | * Return maximum size of a request at given offset. Only valid for | |
920 | * file system requests. | |
921 | */ | |
922 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
923 | sector_t offset) | |
924 | { | |
925 | if (!q->limits.chunk_sectors) | |
736ed4de | 926 | return q->limits.max_sectors; |
762380ad JA |
927 | |
928 | return q->limits.chunk_sectors - | |
929 | (offset & (q->limits.chunk_sectors - 1)); | |
930 | } | |
931 | ||
f31dc1cd MP |
932 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) |
933 | { | |
934 | struct request_queue *q = rq->q; | |
935 | ||
936 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
937 | return q->limits.max_hw_sectors; | |
938 | ||
762380ad JA |
939 | if (!q->limits.chunk_sectors) |
940 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
941 | ||
942 | return min(blk_max_size_offset(q, blk_rq_pos(rq)), | |
943 | blk_queue_get_max_sectors(q, rq->cmd_flags)); | |
f31dc1cd MP |
944 | } |
945 | ||
75afb352 JN |
946 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
947 | { | |
948 | unsigned int nr_bios = 0; | |
949 | struct bio *bio; | |
950 | ||
951 | __rq_for_each_bio(bio, rq) | |
952 | nr_bios++; | |
953 | ||
954 | return nr_bios; | |
955 | } | |
956 | ||
9934c8c0 TH |
957 | /* |
958 | * Request issue related functions. | |
959 | */ | |
960 | extern struct request *blk_peek_request(struct request_queue *q); | |
961 | extern void blk_start_request(struct request *rq); | |
962 | extern struct request *blk_fetch_request(struct request_queue *q); | |
963 | ||
1da177e4 | 964 | /* |
2e60e022 TH |
965 | * Request completion related functions. |
966 | * | |
967 | * blk_update_request() completes given number of bytes and updates | |
968 | * the request without completing it. | |
969 | * | |
f06d9a2b TH |
970 | * blk_end_request() and friends. __blk_end_request() must be called |
971 | * with the request queue spinlock acquired. | |
1da177e4 LT |
972 | * |
973 | * Several drivers define their own end_request and call | |
3bcddeac KU |
974 | * blk_end_request() for parts of the original function. |
975 | * This prevents code duplication in drivers. | |
1da177e4 | 976 | */ |
2e60e022 TH |
977 | extern bool blk_update_request(struct request *rq, int error, |
978 | unsigned int nr_bytes); | |
12120077 | 979 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
980 | extern bool blk_end_request(struct request *rq, int error, |
981 | unsigned int nr_bytes); | |
982 | extern void blk_end_request_all(struct request *rq, int error); | |
983 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 984 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
985 | extern bool __blk_end_request(struct request *rq, int error, |
986 | unsigned int nr_bytes); | |
987 | extern void __blk_end_request_all(struct request *rq, int error); | |
988 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 989 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 990 | |
ff856bad | 991 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
992 | extern void __blk_complete_request(struct request *); |
993 | extern void blk_abort_request(struct request *); | |
28018c24 | 994 | extern void blk_unprep_request(struct request *); |
ff856bad | 995 | |
1da177e4 LT |
996 | /* |
997 | * Access functions for manipulating queue properties | |
998 | */ | |
165125e1 | 999 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1000 | spinlock_t *lock, int node_id); |
165125e1 | 1001 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
1002 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
1003 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
1004 | extern void blk_cleanup_queue(struct request_queue *); |
1005 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1006 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 1007 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 1008 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1009 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1010 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 1011 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1012 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1013 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1014 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1015 | unsigned int max_write_same_sectors); | |
e1defc4f | 1016 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1017 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1018 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1019 | unsigned int alignment); | |
7c958e32 | 1020 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1021 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1022 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1023 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 1024 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1025 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1026 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1027 | sector_t offset); | |
17be8c24 MP |
1028 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1029 | sector_t offset); | |
c72758f3 MP |
1030 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1031 | sector_t offset); | |
165125e1 | 1032 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1033 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1034 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1035 | extern int blk_queue_dma_drain(struct request_queue *q, |
1036 | dma_drain_needed_fn *dma_drain_needed, | |
1037 | void *buf, unsigned int size); | |
ef9e3fac | 1038 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
1039 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
1040 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 1041 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
1042 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
1043 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 1044 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1045 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1046 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1047 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 1048 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 1049 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 1050 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1051 | |
165125e1 | 1052 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
1053 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
1054 | struct scatterlist *sglist); | |
1da177e4 | 1055 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1056 | extern long nr_blockdev_pages(void); |
1da177e4 | 1057 | |
09ac46c4 | 1058 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1059 | struct request_queue *blk_alloc_queue(gfp_t); |
1060 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1061 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 1062 | |
6c954667 LM |
1063 | /* |
1064 | * block layer runtime pm functions | |
1065 | */ | |
1066 | #ifdef CONFIG_PM_RUNTIME | |
1067 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); | |
1068 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1069 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1070 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1071 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1072 | #else | |
1073 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1074 | struct device *dev) {} | |
1075 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1076 | { | |
1077 | return -ENOSYS; | |
1078 | } | |
1079 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1080 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1081 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1082 | #endif | |
1083 | ||
316cc67d | 1084 | /* |
75df7136 SJ |
1085 | * blk_plug permits building a queue of related requests by holding the I/O |
1086 | * fragments for a short period. This allows merging of sequential requests | |
1087 | * into single larger request. As the requests are moved from a per-task list to | |
1088 | * the device's request_queue in a batch, this results in improved scalability | |
1089 | * as the lock contention for request_queue lock is reduced. | |
1090 | * | |
1091 | * It is ok not to disable preemption when adding the request to the plug list | |
1092 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1093 | * the plug list when the task sleeps by itself. For details, please see | |
1094 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1095 | */ |
73c10101 | 1096 | struct blk_plug { |
75df7136 | 1097 | struct list_head list; /* requests */ |
320ae51f | 1098 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1099 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1100 | }; |
55c022bb SL |
1101 | #define BLK_MAX_REQUEST_COUNT 16 |
1102 | ||
9cbb1750 | 1103 | struct blk_plug_cb; |
74018dc3 | 1104 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1105 | struct blk_plug_cb { |
1106 | struct list_head list; | |
9cbb1750 N |
1107 | blk_plug_cb_fn callback; |
1108 | void *data; | |
048c9374 | 1109 | }; |
9cbb1750 N |
1110 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1111 | void *data, int size); | |
73c10101 JA |
1112 | extern void blk_start_plug(struct blk_plug *); |
1113 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1114 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1115 | |
1116 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1117 | { | |
1118 | struct blk_plug *plug = tsk->plug; | |
1119 | ||
a237c1c5 JA |
1120 | if (plug) |
1121 | blk_flush_plug_list(plug, false); | |
1122 | } | |
1123 | ||
1124 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1125 | { | |
1126 | struct blk_plug *plug = tsk->plug; | |
1127 | ||
88b996cd | 1128 | if (plug) |
f6603783 | 1129 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1130 | } |
1131 | ||
1132 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1133 | { | |
1134 | struct blk_plug *plug = tsk->plug; | |
1135 | ||
320ae51f JA |
1136 | return plug && |
1137 | (!list_empty(&plug->list) || | |
1138 | !list_empty(&plug->mq_list) || | |
1139 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1140 | } |
1141 | ||
1da177e4 LT |
1142 | /* |
1143 | * tag stuff | |
1144 | */ | |
fb3ccb5d CH |
1145 | #define blk_rq_tagged(rq) \ |
1146 | ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED)) | |
165125e1 JA |
1147 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1148 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1149 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1150 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1151 | extern void blk_queue_free_tags(struct request_queue *); | |
1152 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1153 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1154 | extern struct blk_queue_tag *blk_init_tags(int); |
1155 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1156 | |
f583f492 DS |
1157 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1158 | int tag) | |
1159 | { | |
1160 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1161 | return NULL; | |
1162 | return bqt->tag_index[tag]; | |
1163 | } | |
dd3932ed CH |
1164 | |
1165 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1166 | ||
1167 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1168 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1169 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1170 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1171 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1172 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 1173 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
1174 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1175 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1176 | { |
2cf6d26a CH |
1177 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1178 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1179 | gfp_mask, flags); | |
fb2dce86 | 1180 | } |
e6fa0be6 | 1181 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1182 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1183 | { |
1184 | return blkdev_issue_zeroout(sb->s_bdev, | |
1185 | block << (sb->s_blocksize_bits - 9), | |
1186 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1187 | gfp_mask); |
e6fa0be6 | 1188 | } |
1da177e4 | 1189 | |
018e0446 | 1190 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1191 | |
eb28d31b MP |
1192 | enum blk_default_limits { |
1193 | BLK_MAX_SEGMENTS = 128, | |
1194 | BLK_SAFE_MAX_SECTORS = 255, | |
1195 | BLK_DEF_MAX_SECTORS = 1024, | |
1196 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1197 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1198 | }; | |
0e435ac2 | 1199 | |
1da177e4 LT |
1200 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1201 | ||
ae03bf63 MP |
1202 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1203 | { | |
025146e1 | 1204 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1205 | } |
1206 | ||
1207 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1208 | { | |
025146e1 | 1209 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1210 | } |
1211 | ||
1212 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1213 | { | |
025146e1 | 1214 | return q->limits.max_sectors; |
ae03bf63 MP |
1215 | } |
1216 | ||
1217 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1218 | { | |
025146e1 | 1219 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1220 | } |
1221 | ||
8a78362c | 1222 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1223 | { |
8a78362c | 1224 | return q->limits.max_segments; |
ae03bf63 MP |
1225 | } |
1226 | ||
1227 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1228 | { | |
025146e1 | 1229 | return q->limits.max_segment_size; |
ae03bf63 MP |
1230 | } |
1231 | ||
e1defc4f | 1232 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1233 | { |
1234 | int retval = 512; | |
1235 | ||
025146e1 MP |
1236 | if (q && q->limits.logical_block_size) |
1237 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1238 | |
1239 | return retval; | |
1240 | } | |
1241 | ||
e1defc4f | 1242 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1243 | { |
e1defc4f | 1244 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1245 | } |
1246 | ||
c72758f3 MP |
1247 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1248 | { | |
1249 | return q->limits.physical_block_size; | |
1250 | } | |
1251 | ||
892b6f90 | 1252 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1253 | { |
1254 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1255 | } | |
1256 | ||
c72758f3 MP |
1257 | static inline unsigned int queue_io_min(struct request_queue *q) |
1258 | { | |
1259 | return q->limits.io_min; | |
1260 | } | |
1261 | ||
ac481c20 MP |
1262 | static inline int bdev_io_min(struct block_device *bdev) |
1263 | { | |
1264 | return queue_io_min(bdev_get_queue(bdev)); | |
1265 | } | |
1266 | ||
c72758f3 MP |
1267 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1268 | { | |
1269 | return q->limits.io_opt; | |
1270 | } | |
1271 | ||
ac481c20 MP |
1272 | static inline int bdev_io_opt(struct block_device *bdev) |
1273 | { | |
1274 | return queue_io_opt(bdev_get_queue(bdev)); | |
1275 | } | |
1276 | ||
c72758f3 MP |
1277 | static inline int queue_alignment_offset(struct request_queue *q) |
1278 | { | |
ac481c20 | 1279 | if (q->limits.misaligned) |
c72758f3 MP |
1280 | return -1; |
1281 | ||
ac481c20 | 1282 | return q->limits.alignment_offset; |
c72758f3 MP |
1283 | } |
1284 | ||
e03a72e1 | 1285 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1286 | { |
1287 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1288 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1289 | |
e03a72e1 MP |
1290 | return (granularity + lim->alignment_offset - alignment) |
1291 | & (granularity - 1); | |
c72758f3 MP |
1292 | } |
1293 | ||
ac481c20 MP |
1294 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1295 | { | |
1296 | struct request_queue *q = bdev_get_queue(bdev); | |
1297 | ||
1298 | if (q->limits.misaligned) | |
1299 | return -1; | |
1300 | ||
1301 | if (bdev != bdev->bd_contains) | |
1302 | return bdev->bd_part->alignment_offset; | |
1303 | ||
1304 | return q->limits.alignment_offset; | |
1305 | } | |
1306 | ||
86b37281 MP |
1307 | static inline int queue_discard_alignment(struct request_queue *q) |
1308 | { | |
1309 | if (q->limits.discard_misaligned) | |
1310 | return -1; | |
1311 | ||
1312 | return q->limits.discard_alignment; | |
1313 | } | |
1314 | ||
e03a72e1 | 1315 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1316 | { |
59771079 | 1317 | unsigned int alignment, granularity, offset; |
dd3d145d | 1318 | |
a934a00a MP |
1319 | if (!lim->max_discard_sectors) |
1320 | return 0; | |
1321 | ||
59771079 LT |
1322 | /* Why are these in bytes, not sectors? */ |
1323 | alignment = lim->discard_alignment >> 9; | |
1324 | granularity = lim->discard_granularity >> 9; | |
1325 | if (!granularity) | |
1326 | return 0; | |
1327 | ||
1328 | /* Offset of the partition start in 'granularity' sectors */ | |
1329 | offset = sector_div(sector, granularity); | |
1330 | ||
1331 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1332 | offset = (granularity + alignment - offset) % granularity; | |
1333 | ||
1334 | /* Turn it back into bytes, gaah */ | |
1335 | return offset << 9; | |
86b37281 MP |
1336 | } |
1337 | ||
c6e66634 PB |
1338 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1339 | { | |
1340 | struct request_queue *q = bdev_get_queue(bdev); | |
1341 | ||
1342 | if (bdev != bdev->bd_contains) | |
1343 | return bdev->bd_part->discard_alignment; | |
1344 | ||
1345 | return q->limits.discard_alignment; | |
1346 | } | |
1347 | ||
98262f27 MP |
1348 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1349 | { | |
a934a00a | 1350 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1351 | return 1; |
1352 | ||
1353 | return 0; | |
1354 | } | |
1355 | ||
1356 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1357 | { | |
1358 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1359 | } | |
1360 | ||
4363ac7c MP |
1361 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1362 | { | |
1363 | struct request_queue *q = bdev_get_queue(bdev); | |
1364 | ||
1365 | if (q) | |
1366 | return q->limits.max_write_same_sectors; | |
1367 | ||
1368 | return 0; | |
1369 | } | |
1370 | ||
165125e1 | 1371 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1372 | { |
482eb689 | 1373 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1374 | } |
1375 | ||
14417799 | 1376 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1377 | unsigned int len) |
1378 | { | |
1379 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1380 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1381 | } |
1382 | ||
1da177e4 LT |
1383 | /* assumes size > 256 */ |
1384 | static inline unsigned int blksize_bits(unsigned int size) | |
1385 | { | |
1386 | unsigned int bits = 8; | |
1387 | do { | |
1388 | bits++; | |
1389 | size >>= 1; | |
1390 | } while (size > 256); | |
1391 | return bits; | |
1392 | } | |
1393 | ||
2befb9e3 | 1394 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1395 | { |
1396 | return bdev->bd_block_size; | |
1397 | } | |
1398 | ||
f3876930 | 1399 | static inline bool queue_flush_queueable(struct request_queue *q) |
1400 | { | |
1401 | return !q->flush_not_queueable; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | typedef struct {struct page *v;} Sector; |
1405 | ||
1406 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1407 | ||
1408 | static inline void put_dev_sector(Sector p) | |
1409 | { | |
1410 | page_cache_release(p.v); | |
1411 | } | |
1412 | ||
1413 | struct work_struct; | |
59c3d45e JA |
1414 | int kblockd_schedule_work(struct work_struct *work); |
1415 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1416 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1417 | |
9195291e | 1418 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1419 | /* |
1420 | * This should not be using sched_clock(). A real patch is in progress | |
1421 | * to fix this up, until that is in place we need to disable preemption | |
1422 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1423 | */ | |
9195291e DS |
1424 | static inline void set_start_time_ns(struct request *req) |
1425 | { | |
28f4197e | 1426 | preempt_disable(); |
9195291e | 1427 | req->start_time_ns = sched_clock(); |
28f4197e | 1428 | preempt_enable(); |
9195291e DS |
1429 | } |
1430 | ||
1431 | static inline void set_io_start_time_ns(struct request *req) | |
1432 | { | |
28f4197e | 1433 | preempt_disable(); |
9195291e | 1434 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1435 | preempt_enable(); |
9195291e | 1436 | } |
84c124da DS |
1437 | |
1438 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1439 | { | |
1440 | return req->start_time_ns; | |
1441 | } | |
1442 | ||
1443 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1444 | { | |
1445 | return req->io_start_time_ns; | |
1446 | } | |
9195291e DS |
1447 | #else |
1448 | static inline void set_start_time_ns(struct request *req) {} | |
1449 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1450 | static inline uint64_t rq_start_time_ns(struct request *req) |
1451 | { | |
1452 | return 0; | |
1453 | } | |
1454 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1455 | { | |
1456 | return 0; | |
1457 | } | |
9195291e DS |
1458 | #endif |
1459 | ||
1da177e4 LT |
1460 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1461 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1462 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1463 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1464 | ||
7ba1ba12 MP |
1465 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1466 | ||
b24498d4 JA |
1467 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1468 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1469 | |
1470 | struct blk_integrity_exchg { | |
1471 | void *prot_buf; | |
1472 | void *data_buf; | |
1473 | sector_t sector; | |
1474 | unsigned int data_size; | |
1475 | unsigned short sector_size; | |
1476 | const char *disk_name; | |
1477 | }; | |
1478 | ||
1479 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1480 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1481 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1482 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1483 | ||
1484 | struct blk_integrity { | |
1485 | integrity_gen_fn *generate_fn; | |
1486 | integrity_vrfy_fn *verify_fn; | |
1487 | integrity_set_tag_fn *set_tag_fn; | |
1488 | integrity_get_tag_fn *get_tag_fn; | |
1489 | ||
1490 | unsigned short flags; | |
1491 | unsigned short tuple_size; | |
1492 | unsigned short sector_size; | |
1493 | unsigned short tag_size; | |
1494 | ||
1495 | const char *name; | |
1496 | ||
1497 | struct kobject kobj; | |
1498 | }; | |
1499 | ||
a63a5cf8 | 1500 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1501 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1502 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1503 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1504 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1505 | struct scatterlist *); | |
1506 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1507 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1508 | struct request *); | |
1509 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1510 | struct bio *); | |
7ba1ba12 | 1511 | |
b04accc4 JA |
1512 | static inline |
1513 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1514 | { | |
1515 | return bdev->bd_disk->integrity; | |
1516 | } | |
1517 | ||
b02739b0 MP |
1518 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1519 | { | |
1520 | return disk->integrity; | |
1521 | } | |
1522 | ||
7ba1ba12 MP |
1523 | static inline int blk_integrity_rq(struct request *rq) |
1524 | { | |
d442cc44 MP |
1525 | if (rq->bio == NULL) |
1526 | return 0; | |
1527 | ||
7ba1ba12 MP |
1528 | return bio_integrity(rq->bio); |
1529 | } | |
1530 | ||
13f05c8d MP |
1531 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1532 | unsigned int segs) | |
1533 | { | |
1534 | q->limits.max_integrity_segments = segs; | |
1535 | } | |
1536 | ||
1537 | static inline unsigned short | |
1538 | queue_max_integrity_segments(struct request_queue *q) | |
1539 | { | |
1540 | return q->limits.max_integrity_segments; | |
1541 | } | |
1542 | ||
7ba1ba12 MP |
1543 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1544 | ||
fd83240a SR |
1545 | struct bio; |
1546 | struct block_device; | |
1547 | struct gendisk; | |
1548 | struct blk_integrity; | |
1549 | ||
1550 | static inline int blk_integrity_rq(struct request *rq) | |
1551 | { | |
1552 | return 0; | |
1553 | } | |
1554 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1555 | struct bio *b) | |
1556 | { | |
1557 | return 0; | |
1558 | } | |
1559 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1560 | struct bio *b, | |
1561 | struct scatterlist *s) | |
1562 | { | |
1563 | return 0; | |
1564 | } | |
1565 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1566 | { | |
1567 | return 0; | |
1568 | } | |
1569 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1570 | { | |
1571 | return NULL; | |
1572 | } | |
1573 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1574 | { | |
1575 | return 0; | |
1576 | } | |
1577 | static inline int blk_integrity_register(struct gendisk *d, | |
1578 | struct blk_integrity *b) | |
1579 | { | |
1580 | return 0; | |
1581 | } | |
1582 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1583 | { | |
1584 | } | |
1585 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1586 | unsigned int segs) | |
1587 | { | |
1588 | } | |
1589 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1590 | { | |
1591 | return 0; | |
1592 | } | |
1593 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1594 | struct request *r1, | |
1595 | struct request *r2) | |
1596 | { | |
1597 | return 0; | |
1598 | } | |
1599 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1600 | struct request *r, | |
1601 | struct bio *b) | |
1602 | { | |
1603 | return 0; | |
1604 | } | |
1605 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1606 | { | |
1607 | return 0; | |
1608 | } | |
7ba1ba12 MP |
1609 | |
1610 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1611 | ||
08f85851 | 1612 | struct block_device_operations { |
d4430d62 | 1613 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1614 | void (*release) (struct gendisk *, fmode_t); |
47a191fd | 1615 | int (*rw_page)(struct block_device *, sector_t, struct page *, int rw); |
d4430d62 AV |
1616 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1617 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1618 | int (*direct_access) (struct block_device *, sector_t, |
1619 | void **, unsigned long *); | |
77ea887e TH |
1620 | unsigned int (*check_events) (struct gendisk *disk, |
1621 | unsigned int clearing); | |
1622 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1623 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1624 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1625 | int (*revalidate_disk) (struct gendisk *); |
1626 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1627 | /* this callback is with swap_lock and sometimes page table lock held */ |
1628 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1629 | struct module *owner; |
1630 | }; | |
1631 | ||
633a08b8 AV |
1632 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1633 | unsigned long); | |
47a191fd MW |
1634 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1635 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1636 | struct writeback_control *); | |
9361401e | 1637 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1638 | |
1639 | struct block_device; | |
1640 | ||
9361401e DH |
1641 | /* |
1642 | * stubs for when the block layer is configured out | |
1643 | */ | |
1644 | #define buffer_heads_over_limit 0 | |
1645 | ||
9361401e DH |
1646 | static inline long nr_blockdev_pages(void) |
1647 | { | |
1648 | return 0; | |
1649 | } | |
1650 | ||
1f940bdf JA |
1651 | struct blk_plug { |
1652 | }; | |
1653 | ||
1654 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1655 | { |
1656 | } | |
1657 | ||
1f940bdf | 1658 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1659 | { |
1660 | } | |
1661 | ||
1f940bdf | 1662 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1663 | { |
1664 | } | |
1665 | ||
a237c1c5 JA |
1666 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1667 | { | |
1668 | } | |
1669 | ||
1670 | ||
73c10101 JA |
1671 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1672 | { | |
1673 | return false; | |
1674 | } | |
1675 | ||
ac13a829 FF |
1676 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1677 | sector_t *error_sector) | |
1678 | { | |
1679 | return 0; | |
1680 | } | |
1681 | ||
9361401e DH |
1682 | #endif /* CONFIG_BLOCK */ |
1683 | ||
1da177e4 | 1684 | #endif |