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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> |
1da177e4 LT |
24 | |
25 | #include <asm/scatterlist.h> | |
26 | ||
de477254 | 27 | struct module; |
21b2f0c8 CH |
28 | struct scsi_ioctl_command; |
29 | ||
1da177e4 | 30 | struct request_queue; |
1da177e4 | 31 | struct elevator_queue; |
1da177e4 | 32 | struct request_pm_state; |
2056a782 | 33 | struct blk_trace; |
3d6392cf JA |
34 | struct request; |
35 | struct sg_io_hdr; | |
aa387cc8 | 36 | struct bsg_job; |
3c798398 | 37 | struct blkcg_gq; |
1da177e4 LT |
38 | |
39 | #define BLKDEV_MIN_RQ 4 | |
40 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
41 | ||
8bd435b3 TH |
42 | /* |
43 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
44 | * Defined here to simplify include dependency. | |
45 | */ | |
46 | #define BLKCG_MAX_POLS 2 | |
47 | ||
1da177e4 | 48 | struct request; |
8ffdc655 | 49 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 50 | |
5b788ce3 TH |
51 | #define BLK_RL_SYNCFULL (1U << 0) |
52 | #define BLK_RL_ASYNCFULL (1U << 1) | |
53 | ||
1da177e4 | 54 | struct request_list { |
5b788ce3 | 55 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
56 | #ifdef CONFIG_BLK_CGROUP |
57 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
58 | #endif | |
1faa16d2 JA |
59 | /* |
60 | * count[], starved[], and wait[] are indexed by | |
61 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
62 | */ | |
8a5ecdd4 TH |
63 | int count[2]; |
64 | int starved[2]; | |
65 | mempool_t *rq_pool; | |
66 | wait_queue_head_t wait[2]; | |
5b788ce3 | 67 | unsigned int flags; |
1da177e4 LT |
68 | }; |
69 | ||
4aff5e23 JA |
70 | /* |
71 | * request command types | |
72 | */ | |
73 | enum rq_cmd_type_bits { | |
74 | REQ_TYPE_FS = 1, /* fs request */ | |
75 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
76 | REQ_TYPE_SENSE, /* sense request */ | |
77 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
78 | REQ_TYPE_PM_RESUME, /* resume request */ | |
79 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 80 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
81 | /* |
82 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
83 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
84 | * private REQ_LB opcodes to differentiate what type of request this is | |
85 | */ | |
4aff5e23 | 86 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 87 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
88 | }; |
89 | ||
1da177e4 LT |
90 | #define BLK_MAX_CDB 16 |
91 | ||
92 | /* | |
af76e555 CH |
93 | * Try to put the fields that are referenced together in the same cacheline. |
94 | * | |
95 | * If you modify this structure, make sure to update blk_rq_init() and | |
96 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
97 | */ |
98 | struct request { | |
6897fc22 | 99 | struct list_head queuelist; |
320ae51f JA |
100 | union { |
101 | struct call_single_data csd; | |
8b4922d3 | 102 | unsigned long fifo_time; |
320ae51f | 103 | }; |
ff856bad | 104 | |
165125e1 | 105 | struct request_queue *q; |
320ae51f | 106 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 107 | |
5953316d | 108 | u64 cmd_flags; |
4aff5e23 | 109 | enum rq_cmd_type_bits cmd_type; |
242f9dcb | 110 | unsigned long atomic_flags; |
1da177e4 | 111 | |
181fdde3 RK |
112 | int cpu; |
113 | ||
a2dec7b3 | 114 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 115 | unsigned int __data_len; /* total data len */ |
181fdde3 | 116 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
117 | |
118 | struct bio *bio; | |
119 | struct bio *biotail; | |
120 | ||
360f92c2 JA |
121 | /* |
122 | * The hash is used inside the scheduler, and killed once the | |
123 | * request reaches the dispatch list. The ipi_list is only used | |
124 | * to queue the request for softirq completion, which is long | |
125 | * after the request has been unhashed (and even removed from | |
126 | * the dispatch list). | |
127 | */ | |
128 | union { | |
129 | struct hlist_node hash; /* merge hash */ | |
130 | struct list_head ipi_list; | |
131 | }; | |
132 | ||
e6a1c874 JA |
133 | /* |
134 | * The rb_node is only used inside the io scheduler, requests | |
135 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 136 | * completion_data share space with the rb_node. |
e6a1c874 JA |
137 | */ |
138 | union { | |
139 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 140 | void *completion_data; |
e6a1c874 | 141 | }; |
9817064b | 142 | |
ff7d145f | 143 | /* |
7f1dc8a2 | 144 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
145 | * more they have to dynamically allocate it. Flush requests are |
146 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 147 | * space with the elevator data. |
ff7d145f | 148 | */ |
c186794d | 149 | union { |
a612fddf TH |
150 | struct { |
151 | struct io_cq *icq; | |
152 | void *priv[2]; | |
153 | } elv; | |
154 | ||
c186794d MS |
155 | struct { |
156 | unsigned int seq; | |
157 | struct list_head list; | |
4853abaa | 158 | rq_end_io_fn *saved_end_io; |
c186794d MS |
159 | } flush; |
160 | }; | |
ff7d145f | 161 | |
8f34ee75 | 162 | struct gendisk *rq_disk; |
09e099d4 | 163 | struct hd_struct *part; |
1da177e4 | 164 | unsigned long start_time; |
9195291e | 165 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 166 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
167 | unsigned long long start_time_ns; |
168 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
169 | #endif | |
1da177e4 LT |
170 | /* Number of scatter-gather DMA addr+len pairs after |
171 | * physical address coalescing is performed. | |
172 | */ | |
173 | unsigned short nr_phys_segments; | |
13f05c8d MP |
174 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
175 | unsigned short nr_integrity_segments; | |
176 | #endif | |
1da177e4 | 177 | |
8f34ee75 JA |
178 | unsigned short ioprio; |
179 | ||
731ec497 | 180 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 181 | |
cdd60262 JA |
182 | int tag; |
183 | int errors; | |
184 | ||
1da177e4 LT |
185 | /* |
186 | * when request is used as a packet command carrier | |
187 | */ | |
d7e3c324 FT |
188 | unsigned char __cmd[BLK_MAX_CDB]; |
189 | unsigned char *cmd; | |
181fdde3 | 190 | unsigned short cmd_len; |
1da177e4 | 191 | |
7a85f889 | 192 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 193 | unsigned int sense_len; |
c3a4d78c | 194 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
195 | void *sense; |
196 | ||
242f9dcb JA |
197 | unsigned long deadline; |
198 | struct list_head timeout_list; | |
1da177e4 | 199 | unsigned int timeout; |
17e01f21 | 200 | int retries; |
1da177e4 | 201 | |
1da177e4 | 202 | /* |
c00895ab | 203 | * completion callback. |
1da177e4 LT |
204 | */ |
205 | rq_end_io_fn *end_io; | |
206 | void *end_io_data; | |
abae1fde FT |
207 | |
208 | /* for bidi */ | |
209 | struct request *next_rq; | |
1da177e4 LT |
210 | }; |
211 | ||
766ca442 FLVC |
212 | static inline unsigned short req_get_ioprio(struct request *req) |
213 | { | |
214 | return req->ioprio; | |
215 | } | |
216 | ||
1da177e4 | 217 | /* |
4aff5e23 | 218 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
219 | * requests. Some step values could eventually be made generic. |
220 | */ | |
221 | struct request_pm_state | |
222 | { | |
223 | /* PM state machine step value, currently driver specific */ | |
224 | int pm_step; | |
225 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
226 | u32 pm_state; | |
227 | void* data; /* for driver use */ | |
228 | }; | |
229 | ||
230 | #include <linux/elevator.h> | |
231 | ||
320ae51f JA |
232 | struct blk_queue_ctx; |
233 | ||
165125e1 | 234 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 235 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 236 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 237 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
238 | |
239 | struct bio_vec; | |
cc371e66 AK |
240 | struct bvec_merge_data { |
241 | struct block_device *bi_bdev; | |
242 | sector_t bi_sector; | |
243 | unsigned bi_size; | |
244 | unsigned long bi_rw; | |
245 | }; | |
246 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
247 | struct bio_vec *); | |
ff856bad | 248 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 249 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 250 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 251 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 252 | |
242f9dcb JA |
253 | enum blk_eh_timer_return { |
254 | BLK_EH_NOT_HANDLED, | |
255 | BLK_EH_HANDLED, | |
256 | BLK_EH_RESET_TIMER, | |
257 | }; | |
258 | ||
259 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
260 | ||
1da177e4 LT |
261 | enum blk_queue_state { |
262 | Queue_down, | |
263 | Queue_up, | |
264 | }; | |
265 | ||
1da177e4 LT |
266 | struct blk_queue_tag { |
267 | struct request **tag_index; /* map of busy tags */ | |
268 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
269 | int busy; /* current depth */ |
270 | int max_depth; /* what we will send to device */ | |
ba025082 | 271 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
272 | atomic_t refcnt; /* map can be shared */ |
273 | }; | |
274 | ||
abf54393 FT |
275 | #define BLK_SCSI_MAX_CMDS (256) |
276 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
277 | ||
025146e1 MP |
278 | struct queue_limits { |
279 | unsigned long bounce_pfn; | |
280 | unsigned long seg_boundary_mask; | |
281 | ||
282 | unsigned int max_hw_sectors; | |
283 | unsigned int max_sectors; | |
284 | unsigned int max_segment_size; | |
c72758f3 MP |
285 | unsigned int physical_block_size; |
286 | unsigned int alignment_offset; | |
287 | unsigned int io_min; | |
288 | unsigned int io_opt; | |
67efc925 | 289 | unsigned int max_discard_sectors; |
4363ac7c | 290 | unsigned int max_write_same_sectors; |
86b37281 MP |
291 | unsigned int discard_granularity; |
292 | unsigned int discard_alignment; | |
025146e1 MP |
293 | |
294 | unsigned short logical_block_size; | |
8a78362c | 295 | unsigned short max_segments; |
13f05c8d | 296 | unsigned short max_integrity_segments; |
025146e1 | 297 | |
c72758f3 | 298 | unsigned char misaligned; |
86b37281 | 299 | unsigned char discard_misaligned; |
e692cb66 | 300 | unsigned char cluster; |
a934a00a | 301 | unsigned char discard_zeroes_data; |
c78afc62 | 302 | unsigned char raid_partial_stripes_expensive; |
025146e1 MP |
303 | }; |
304 | ||
d7b76301 | 305 | struct request_queue { |
1da177e4 LT |
306 | /* |
307 | * Together with queue_head for cacheline sharing | |
308 | */ | |
309 | struct list_head queue_head; | |
310 | struct request *last_merge; | |
b374d18a | 311 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
312 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
313 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
314 | |
315 | /* | |
a051661c TH |
316 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
317 | * is used, root blkg allocates from @q->root_rl and all other | |
318 | * blkgs from their own blkg->rl. Which one to use should be | |
319 | * determined using bio_request_list(). | |
1da177e4 | 320 | */ |
a051661c | 321 | struct request_list root_rl; |
1da177e4 LT |
322 | |
323 | request_fn_proc *request_fn; | |
1da177e4 LT |
324 | make_request_fn *make_request_fn; |
325 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 326 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 327 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 328 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 329 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 330 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 331 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 332 | |
320ae51f JA |
333 | struct blk_mq_ops *mq_ops; |
334 | ||
335 | unsigned int *mq_map; | |
336 | ||
337 | /* sw queues */ | |
338 | struct blk_mq_ctx *queue_ctx; | |
339 | unsigned int nr_queues; | |
340 | ||
341 | /* hw dispatch queues */ | |
342 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
343 | unsigned int nr_hw_queues; | |
344 | ||
8922e16c TH |
345 | /* |
346 | * Dispatch queue sorting | |
347 | */ | |
1b47f531 | 348 | sector_t end_sector; |
8922e16c | 349 | struct request *boundary_rq; |
8922e16c | 350 | |
1da177e4 | 351 | /* |
3cca6dc1 | 352 | * Delayed queue handling |
1da177e4 | 353 | */ |
3cca6dc1 | 354 | struct delayed_work delay_work; |
1da177e4 LT |
355 | |
356 | struct backing_dev_info backing_dev_info; | |
357 | ||
358 | /* | |
359 | * The queue owner gets to use this for whatever they like. | |
360 | * ll_rw_blk doesn't touch it. | |
361 | */ | |
362 | void *queuedata; | |
363 | ||
1da177e4 | 364 | /* |
d7b76301 | 365 | * various queue flags, see QUEUE_* below |
1da177e4 | 366 | */ |
d7b76301 | 367 | unsigned long queue_flags; |
1da177e4 | 368 | |
a73f730d TH |
369 | /* |
370 | * ida allocated id for this queue. Used to index queues from | |
371 | * ioctx. | |
372 | */ | |
373 | int id; | |
374 | ||
1da177e4 | 375 | /* |
d7b76301 | 376 | * queue needs bounce pages for pages above this limit |
1da177e4 | 377 | */ |
d7b76301 | 378 | gfp_t bounce_gfp; |
1da177e4 LT |
379 | |
380 | /* | |
152587de | 381 | * protects queue structures from reentrancy. ->__queue_lock should |
382 | * _never_ be used directly, it is queue private. always use | |
383 | * ->queue_lock. | |
1da177e4 | 384 | */ |
152587de | 385 | spinlock_t __queue_lock; |
1da177e4 LT |
386 | spinlock_t *queue_lock; |
387 | ||
388 | /* | |
389 | * queue kobject | |
390 | */ | |
391 | struct kobject kobj; | |
392 | ||
320ae51f JA |
393 | /* |
394 | * mq queue kobject | |
395 | */ | |
396 | struct kobject mq_kobj; | |
397 | ||
6c954667 LM |
398 | #ifdef CONFIG_PM_RUNTIME |
399 | struct device *dev; | |
400 | int rpm_status; | |
401 | unsigned int nr_pending; | |
402 | #endif | |
403 | ||
1da177e4 LT |
404 | /* |
405 | * queue settings | |
406 | */ | |
407 | unsigned long nr_requests; /* Max # of requests */ | |
408 | unsigned int nr_congestion_on; | |
409 | unsigned int nr_congestion_off; | |
410 | unsigned int nr_batching; | |
411 | ||
fa0ccd83 | 412 | unsigned int dma_drain_size; |
d7b76301 | 413 | void *dma_drain_buffer; |
e3790c7d | 414 | unsigned int dma_pad_mask; |
1da177e4 LT |
415 | unsigned int dma_alignment; |
416 | ||
417 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 418 | struct list_head tag_busy_list; |
1da177e4 | 419 | |
15853af9 | 420 | unsigned int nr_sorted; |
0a7ae2ff | 421 | unsigned int in_flight[2]; |
24faf6f6 BVA |
422 | /* |
423 | * Number of active block driver functions for which blk_drain_queue() | |
424 | * must wait. Must be incremented around functions that unlock the | |
425 | * queue_lock internally, e.g. scsi_request_fn(). | |
426 | */ | |
427 | unsigned int request_fn_active; | |
1da177e4 | 428 | |
242f9dcb JA |
429 | unsigned int rq_timeout; |
430 | struct timer_list timeout; | |
431 | struct list_head timeout_list; | |
432 | ||
a612fddf | 433 | struct list_head icq_list; |
4eef3049 | 434 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 435 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 436 | struct blkcg_gq *root_blkg; |
03aa264a | 437 | struct list_head blkg_list; |
4eef3049 | 438 | #endif |
a612fddf | 439 | |
025146e1 MP |
440 | struct queue_limits limits; |
441 | ||
1da177e4 LT |
442 | /* |
443 | * sg stuff | |
444 | */ | |
445 | unsigned int sg_timeout; | |
446 | unsigned int sg_reserved_size; | |
1946089a | 447 | int node; |
6c5c9341 | 448 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 449 | struct blk_trace *blk_trace; |
6c5c9341 | 450 | #endif |
1da177e4 | 451 | /* |
4913efe4 | 452 | * for flush operations |
1da177e4 | 453 | */ |
4913efe4 | 454 | unsigned int flush_flags; |
f3876930 | 455 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 456 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
457 | unsigned int flush_pending_idx:1; |
458 | unsigned int flush_running_idx:1; | |
459 | unsigned long flush_pending_since; | |
460 | struct list_head flush_queue[2]; | |
461 | struct list_head flush_data_in_flight; | |
18741986 CH |
462 | struct request *flush_rq; |
463 | spinlock_t mq_flush_lock; | |
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 TH |
471 | int bypass_depth; |
472 | ||
d351af01 | 473 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
474 | bsg_job_fn *bsg_job_fn; |
475 | int bsg_job_size; | |
d351af01 FT |
476 | struct bsg_class_device bsg_dev; |
477 | #endif | |
e43473b7 VG |
478 | |
479 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
480 | /* Throttle data */ | |
481 | struct throtl_data *td; | |
482 | #endif | |
548bc8e1 | 483 | struct rcu_head rcu_head; |
320ae51f JA |
484 | wait_queue_head_t mq_freeze_wq; |
485 | struct percpu_counter mq_usage_counter; | |
486 | struct list_head all_q_node; | |
0d2602ca JA |
487 | |
488 | struct blk_mq_tag_set *tag_set; | |
489 | struct list_head tag_set_list; | |
1da177e4 LT |
490 | }; |
491 | ||
1da177e4 LT |
492 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
493 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
494 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
495 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 496 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 497 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
498 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
499 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 500 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
501 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
502 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
503 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 504 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
505 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
506 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
507 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
508 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
509 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 510 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 511 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 512 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 513 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
bc58ba94 JA |
514 | |
515 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 516 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
517 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
518 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 519 | |
94eddfbe JA |
520 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
521 | (1 << QUEUE_FLAG_SAME_COMP)) | |
522 | ||
8bcb6c7d | 523 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 524 | { |
8bcb6c7d AK |
525 | if (q->queue_lock) |
526 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
527 | } |
528 | ||
75ad23bc NP |
529 | static inline void queue_flag_set_unlocked(unsigned int flag, |
530 | struct request_queue *q) | |
531 | { | |
532 | __set_bit(flag, &q->queue_flags); | |
533 | } | |
534 | ||
e48ec690 JA |
535 | static inline int queue_flag_test_and_clear(unsigned int flag, |
536 | struct request_queue *q) | |
537 | { | |
8bcb6c7d | 538 | queue_lockdep_assert_held(q); |
e48ec690 JA |
539 | |
540 | if (test_bit(flag, &q->queue_flags)) { | |
541 | __clear_bit(flag, &q->queue_flags); | |
542 | return 1; | |
543 | } | |
544 | ||
545 | return 0; | |
546 | } | |
547 | ||
548 | static inline int queue_flag_test_and_set(unsigned int flag, | |
549 | struct request_queue *q) | |
550 | { | |
8bcb6c7d | 551 | queue_lockdep_assert_held(q); |
e48ec690 JA |
552 | |
553 | if (!test_bit(flag, &q->queue_flags)) { | |
554 | __set_bit(flag, &q->queue_flags); | |
555 | return 0; | |
556 | } | |
557 | ||
558 | return 1; | |
559 | } | |
560 | ||
75ad23bc NP |
561 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
562 | { | |
8bcb6c7d | 563 | queue_lockdep_assert_held(q); |
75ad23bc NP |
564 | __set_bit(flag, &q->queue_flags); |
565 | } | |
566 | ||
567 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
568 | struct request_queue *q) | |
569 | { | |
570 | __clear_bit(flag, &q->queue_flags); | |
571 | } | |
572 | ||
0a7ae2ff JA |
573 | static inline int queue_in_flight(struct request_queue *q) |
574 | { | |
575 | return q->in_flight[0] + q->in_flight[1]; | |
576 | } | |
577 | ||
75ad23bc NP |
578 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
579 | { | |
8bcb6c7d | 580 | queue_lockdep_assert_held(q); |
75ad23bc NP |
581 | __clear_bit(flag, &q->queue_flags); |
582 | } | |
583 | ||
1da177e4 LT |
584 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
585 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 586 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 587 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 588 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 589 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 590 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
591 | #define blk_queue_noxmerges(q) \ |
592 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 593 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 594 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 595 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
596 | #define blk_queue_stackable(q) \ |
597 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 598 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
599 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
600 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 601 | |
33659ebb CH |
602 | #define blk_noretry_request(rq) \ |
603 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
604 | REQ_FAILFAST_DRIVER)) | |
605 | ||
606 | #define blk_account_rq(rq) \ | |
607 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 608 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 609 | |
1da177e4 | 610 | #define blk_pm_request(rq) \ |
33659ebb CH |
611 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
612 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 613 | |
ab780f1e | 614 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 615 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
616 | /* rq->queuelist of dequeued request must be list_empty() */ |
617 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
618 | |
619 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
620 | ||
5953316d | 621 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 622 | |
49fd524f JA |
623 | /* |
624 | * Driver can handle struct request, if it either has an old style | |
625 | * request_fn defined, or is blk-mq based. | |
626 | */ | |
627 | static inline bool queue_is_rq_based(struct request_queue *q) | |
628 | { | |
629 | return q->request_fn || q->mq_ops; | |
630 | } | |
631 | ||
e692cb66 MP |
632 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
633 | { | |
634 | return q->limits.cluster; | |
635 | } | |
636 | ||
9e2585a8 | 637 | /* |
1faa16d2 | 638 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 639 | */ |
1faa16d2 JA |
640 | static inline bool rw_is_sync(unsigned int rw_flags) |
641 | { | |
7b6d91da | 642 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
643 | } |
644 | ||
645 | static inline bool rq_is_sync(struct request *rq) | |
646 | { | |
647 | return rw_is_sync(rq->cmd_flags); | |
648 | } | |
649 | ||
5b788ce3 | 650 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 651 | { |
5b788ce3 TH |
652 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
653 | ||
654 | return rl->flags & flag; | |
1da177e4 LT |
655 | } |
656 | ||
5b788ce3 | 657 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 658 | { |
5b788ce3 TH |
659 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
660 | ||
661 | rl->flags |= flag; | |
1da177e4 LT |
662 | } |
663 | ||
5b788ce3 | 664 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 665 | { |
5b788ce3 TH |
666 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
667 | ||
668 | rl->flags &= ~flag; | |
1da177e4 LT |
669 | } |
670 | ||
e2a60da7 MP |
671 | static inline bool rq_mergeable(struct request *rq) |
672 | { | |
673 | if (rq->cmd_type != REQ_TYPE_FS) | |
674 | return false; | |
1da177e4 | 675 | |
e2a60da7 MP |
676 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
677 | return false; | |
678 | ||
679 | return true; | |
680 | } | |
1da177e4 | 681 | |
f31dc1cd MP |
682 | static inline bool blk_check_merge_flags(unsigned int flags1, |
683 | unsigned int flags2) | |
684 | { | |
685 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
686 | return false; | |
687 | ||
688 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
689 | return false; | |
690 | ||
4363ac7c MP |
691 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
692 | return false; | |
693 | ||
f31dc1cd MP |
694 | return true; |
695 | } | |
696 | ||
4363ac7c MP |
697 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
698 | { | |
699 | if (bio_data(a) == bio_data(b)) | |
700 | return true; | |
701 | ||
702 | return false; | |
703 | } | |
704 | ||
1da177e4 LT |
705 | /* |
706 | * q->prep_rq_fn return values | |
707 | */ | |
708 | #define BLKPREP_OK 0 /* serve it */ | |
709 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
710 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
711 | ||
712 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
713 | ||
714 | /* | |
715 | * standard bounce addresses: | |
716 | * | |
717 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
718 | * BLK_BOUNCE_ANY : don't bounce anything | |
719 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
720 | */ | |
2472892a AK |
721 | |
722 | #if BITS_PER_LONG == 32 | |
1da177e4 | 723 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
724 | #else |
725 | #define BLK_BOUNCE_HIGH -1ULL | |
726 | #endif | |
727 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 728 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 729 | |
3d6392cf JA |
730 | /* |
731 | * default timeout for SG_IO if none specified | |
732 | */ | |
733 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 734 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 735 | |
2a7326b5 | 736 | #ifdef CONFIG_BOUNCE |
1da177e4 | 737 | extern int init_emergency_isa_pool(void); |
165125e1 | 738 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
739 | #else |
740 | static inline int init_emergency_isa_pool(void) | |
741 | { | |
742 | return 0; | |
743 | } | |
165125e1 | 744 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
745 | { |
746 | } | |
747 | #endif /* CONFIG_MMU */ | |
748 | ||
152e283f FT |
749 | struct rq_map_data { |
750 | struct page **pages; | |
751 | int page_order; | |
752 | int nr_entries; | |
56c451f4 | 753 | unsigned long offset; |
97ae77a1 | 754 | int null_mapped; |
ecb554a8 | 755 | int from_user; |
152e283f FT |
756 | }; |
757 | ||
5705f702 | 758 | struct req_iterator { |
7988613b | 759 | struct bvec_iter iter; |
5705f702 N |
760 | struct bio *bio; |
761 | }; | |
762 | ||
763 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
764 | #define for_each_bio(_bio) \ |
765 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 766 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
767 | if ((rq->bio)) \ |
768 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
769 | ||
5705f702 N |
770 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
771 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 772 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 773 | |
4550dd6c | 774 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 775 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 776 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 777 | |
2d4dc890 IL |
778 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
779 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
780 | #endif | |
781 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
782 | extern void rq_flush_dcache_pages(struct request *rq); | |
783 | #else | |
784 | static inline void rq_flush_dcache_pages(struct request *rq) | |
785 | { | |
786 | } | |
787 | #endif | |
788 | ||
1da177e4 LT |
789 | extern int blk_register_queue(struct gendisk *disk); |
790 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 791 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 792 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 793 | extern void blk_put_request(struct request *); |
165125e1 | 794 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 795 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
796 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
797 | gfp_t); | |
165125e1 | 798 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
799 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
800 | unsigned int len); | |
82124d60 | 801 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 802 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
803 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
804 | struct bio_set *bs, gfp_t gfp_mask, | |
805 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
806 | void *data); | |
807 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
808 | extern int blk_insert_cloned_request(struct request_queue *q, |
809 | struct request *rq); | |
3cca6dc1 | 810 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 811 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 812 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
813 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
814 | unsigned int, void __user *); | |
74f3c8af AV |
815 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
816 | unsigned int, void __user *); | |
e915e872 AV |
817 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
818 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 819 | |
5a7bbad2 | 820 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 821 | |
3fcfab16 AM |
822 | /* |
823 | * A queue has just exitted congestion. Note this in the global counter of | |
824 | * congested queues, and wake up anyone who was waiting for requests to be | |
825 | * put back. | |
826 | */ | |
8aa7e847 | 827 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 828 | { |
8aa7e847 | 829 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
830 | } |
831 | ||
832 | /* | |
833 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
834 | * state flags and increment the global gounter of congested queues. | |
835 | */ | |
8aa7e847 | 836 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 837 | { |
8aa7e847 | 838 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
839 | } |
840 | ||
165125e1 JA |
841 | extern void blk_start_queue(struct request_queue *q); |
842 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 843 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 844 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 845 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 846 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 847 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 848 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
849 | struct rq_map_data *, void __user *, unsigned long, |
850 | gfp_t); | |
8e5cfc45 | 851 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
852 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
853 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
86d564c8 AV |
854 | struct rq_map_data *, const struct sg_iovec *, |
855 | int, unsigned int, gfp_t); | |
165125e1 | 856 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 857 | struct request *, int); |
165125e1 | 858 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 859 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 860 | |
165125e1 | 861 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
862 | { |
863 | return bdev->bd_disk->queue; | |
864 | } | |
865 | ||
5efccd17 | 866 | /* |
80a761fd TH |
867 | * blk_rq_pos() : the current sector |
868 | * blk_rq_bytes() : bytes left in the entire request | |
869 | * blk_rq_cur_bytes() : bytes left in the current segment | |
870 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
871 | * blk_rq_sectors() : sectors left in the entire request | |
872 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 873 | */ |
5b93629b TH |
874 | static inline sector_t blk_rq_pos(const struct request *rq) |
875 | { | |
a2dec7b3 | 876 | return rq->__sector; |
2e46e8b2 TH |
877 | } |
878 | ||
879 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
880 | { | |
a2dec7b3 | 881 | return rq->__data_len; |
5b93629b TH |
882 | } |
883 | ||
2e46e8b2 TH |
884 | static inline int blk_rq_cur_bytes(const struct request *rq) |
885 | { | |
886 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
887 | } | |
5efccd17 | 888 | |
80a761fd TH |
889 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
890 | ||
5b93629b TH |
891 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
892 | { | |
2e46e8b2 | 893 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
894 | } |
895 | ||
896 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
897 | { | |
2e46e8b2 | 898 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
899 | } |
900 | ||
f31dc1cd MP |
901 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
902 | unsigned int cmd_flags) | |
903 | { | |
904 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 905 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 906 | |
4363ac7c MP |
907 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
908 | return q->limits.max_write_same_sectors; | |
909 | ||
f31dc1cd MP |
910 | return q->limits.max_sectors; |
911 | } | |
912 | ||
913 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) | |
914 | { | |
915 | struct request_queue *q = rq->q; | |
916 | ||
917 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
918 | return q->limits.max_hw_sectors; | |
919 | ||
920 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
921 | } | |
922 | ||
75afb352 JN |
923 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
924 | { | |
925 | unsigned int nr_bios = 0; | |
926 | struct bio *bio; | |
927 | ||
928 | __rq_for_each_bio(bio, rq) | |
929 | nr_bios++; | |
930 | ||
931 | return nr_bios; | |
932 | } | |
933 | ||
9934c8c0 TH |
934 | /* |
935 | * Request issue related functions. | |
936 | */ | |
937 | extern struct request *blk_peek_request(struct request_queue *q); | |
938 | extern void blk_start_request(struct request *rq); | |
939 | extern struct request *blk_fetch_request(struct request_queue *q); | |
940 | ||
1da177e4 | 941 | /* |
2e60e022 TH |
942 | * Request completion related functions. |
943 | * | |
944 | * blk_update_request() completes given number of bytes and updates | |
945 | * the request without completing it. | |
946 | * | |
f06d9a2b TH |
947 | * blk_end_request() and friends. __blk_end_request() must be called |
948 | * with the request queue spinlock acquired. | |
1da177e4 LT |
949 | * |
950 | * Several drivers define their own end_request and call | |
3bcddeac KU |
951 | * blk_end_request() for parts of the original function. |
952 | * This prevents code duplication in drivers. | |
1da177e4 | 953 | */ |
2e60e022 TH |
954 | extern bool blk_update_request(struct request *rq, int error, |
955 | unsigned int nr_bytes); | |
12120077 | 956 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
957 | extern bool blk_end_request(struct request *rq, int error, |
958 | unsigned int nr_bytes); | |
959 | extern void blk_end_request_all(struct request *rq, int error); | |
960 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 961 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
962 | extern bool __blk_end_request(struct request *rq, int error, |
963 | unsigned int nr_bytes); | |
964 | extern void __blk_end_request_all(struct request *rq, int error); | |
965 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 966 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 967 | |
ff856bad | 968 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
969 | extern void __blk_complete_request(struct request *); |
970 | extern void blk_abort_request(struct request *); | |
28018c24 | 971 | extern void blk_unprep_request(struct request *); |
ff856bad | 972 | |
1da177e4 LT |
973 | /* |
974 | * Access functions for manipulating queue properties | |
975 | */ | |
165125e1 | 976 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 977 | spinlock_t *lock, int node_id); |
165125e1 | 978 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
979 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
980 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
981 | extern void blk_cleanup_queue(struct request_queue *); |
982 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
983 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 984 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 985 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 986 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 987 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
988 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
989 | unsigned int max_discard_sectors); | |
4363ac7c MP |
990 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
991 | unsigned int max_write_same_sectors); | |
e1defc4f | 992 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 993 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
994 | extern void blk_queue_alignment_offset(struct request_queue *q, |
995 | unsigned int alignment); | |
7c958e32 | 996 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 997 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 998 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 999 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 1000 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1001 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1002 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1003 | sector_t offset); | |
17be8c24 MP |
1004 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1005 | sector_t offset); | |
c72758f3 MP |
1006 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1007 | sector_t offset); | |
165125e1 | 1008 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1009 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1010 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1011 | extern int blk_queue_dma_drain(struct request_queue *q, |
1012 | dma_drain_needed_fn *dma_drain_needed, | |
1013 | void *buf, unsigned int size); | |
ef9e3fac | 1014 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
1015 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
1016 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 1017 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
1018 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
1019 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 1020 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1021 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1022 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1023 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 1024 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 1025 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 1026 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1027 | |
165125e1 | 1028 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
1029 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
1030 | struct scatterlist *sglist); | |
1da177e4 | 1031 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1032 | extern long nr_blockdev_pages(void); |
1da177e4 | 1033 | |
09ac46c4 | 1034 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1035 | struct request_queue *blk_alloc_queue(gfp_t); |
1036 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1037 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 1038 | |
6c954667 LM |
1039 | /* |
1040 | * block layer runtime pm functions | |
1041 | */ | |
1042 | #ifdef CONFIG_PM_RUNTIME | |
1043 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); | |
1044 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1045 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1046 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1047 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
1048 | #else | |
1049 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1050 | struct device *dev) {} | |
1051 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1052 | { | |
1053 | return -ENOSYS; | |
1054 | } | |
1055 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1056 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1057 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
1058 | #endif | |
1059 | ||
316cc67d | 1060 | /* |
75df7136 SJ |
1061 | * blk_plug permits building a queue of related requests by holding the I/O |
1062 | * fragments for a short period. This allows merging of sequential requests | |
1063 | * into single larger request. As the requests are moved from a per-task list to | |
1064 | * the device's request_queue in a batch, this results in improved scalability | |
1065 | * as the lock contention for request_queue lock is reduced. | |
1066 | * | |
1067 | * It is ok not to disable preemption when adding the request to the plug list | |
1068 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1069 | * the plug list when the task sleeps by itself. For details, please see | |
1070 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1071 | */ |
73c10101 | 1072 | struct blk_plug { |
75df7136 | 1073 | struct list_head list; /* requests */ |
320ae51f | 1074 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1075 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1076 | }; |
55c022bb SL |
1077 | #define BLK_MAX_REQUEST_COUNT 16 |
1078 | ||
9cbb1750 | 1079 | struct blk_plug_cb; |
74018dc3 | 1080 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1081 | struct blk_plug_cb { |
1082 | struct list_head list; | |
9cbb1750 N |
1083 | blk_plug_cb_fn callback; |
1084 | void *data; | |
048c9374 | 1085 | }; |
9cbb1750 N |
1086 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1087 | void *data, int size); | |
73c10101 JA |
1088 | extern void blk_start_plug(struct blk_plug *); |
1089 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1090 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1091 | |
1092 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1093 | { | |
1094 | struct blk_plug *plug = tsk->plug; | |
1095 | ||
a237c1c5 JA |
1096 | if (plug) |
1097 | blk_flush_plug_list(plug, false); | |
1098 | } | |
1099 | ||
1100 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1101 | { | |
1102 | struct blk_plug *plug = tsk->plug; | |
1103 | ||
88b996cd | 1104 | if (plug) |
f6603783 | 1105 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1106 | } |
1107 | ||
1108 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1109 | { | |
1110 | struct blk_plug *plug = tsk->plug; | |
1111 | ||
320ae51f JA |
1112 | return plug && |
1113 | (!list_empty(&plug->list) || | |
1114 | !list_empty(&plug->mq_list) || | |
1115 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1116 | } |
1117 | ||
1da177e4 LT |
1118 | /* |
1119 | * tag stuff | |
1120 | */ | |
fb3ccb5d CH |
1121 | #define blk_rq_tagged(rq) \ |
1122 | ((rq)->mq_ctx || ((rq)->cmd_flags & REQ_QUEUED)) | |
165125e1 JA |
1123 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1124 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1125 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1126 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1127 | extern void blk_queue_free_tags(struct request_queue *); | |
1128 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1129 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1130 | extern struct blk_queue_tag *blk_init_tags(int); |
1131 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1132 | |
f583f492 DS |
1133 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1134 | int tag) | |
1135 | { | |
1136 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1137 | return NULL; | |
1138 | return bqt->tag_index[tag]; | |
1139 | } | |
dd3932ed CH |
1140 | |
1141 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1142 | ||
1143 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1144 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1145 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1146 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1147 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1148 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 1149 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
1150 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1151 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1152 | { |
2cf6d26a CH |
1153 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1154 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1155 | gfp_mask, flags); | |
fb2dce86 | 1156 | } |
e6fa0be6 | 1157 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1158 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1159 | { |
1160 | return blkdev_issue_zeroout(sb->s_bdev, | |
1161 | block << (sb->s_blocksize_bits - 9), | |
1162 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1163 | gfp_mask); |
e6fa0be6 | 1164 | } |
1da177e4 | 1165 | |
018e0446 | 1166 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1167 | |
eb28d31b MP |
1168 | enum blk_default_limits { |
1169 | BLK_MAX_SEGMENTS = 128, | |
1170 | BLK_SAFE_MAX_SECTORS = 255, | |
1171 | BLK_DEF_MAX_SECTORS = 1024, | |
1172 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1173 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1174 | }; | |
0e435ac2 | 1175 | |
1da177e4 LT |
1176 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1177 | ||
ae03bf63 MP |
1178 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1179 | { | |
025146e1 | 1180 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1181 | } |
1182 | ||
1183 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1184 | { | |
025146e1 | 1185 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1186 | } |
1187 | ||
1188 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1189 | { | |
025146e1 | 1190 | return q->limits.max_sectors; |
ae03bf63 MP |
1191 | } |
1192 | ||
1193 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1194 | { | |
025146e1 | 1195 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1196 | } |
1197 | ||
8a78362c | 1198 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1199 | { |
8a78362c | 1200 | return q->limits.max_segments; |
ae03bf63 MP |
1201 | } |
1202 | ||
1203 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1204 | { | |
025146e1 | 1205 | return q->limits.max_segment_size; |
ae03bf63 MP |
1206 | } |
1207 | ||
e1defc4f | 1208 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1209 | { |
1210 | int retval = 512; | |
1211 | ||
025146e1 MP |
1212 | if (q && q->limits.logical_block_size) |
1213 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1214 | |
1215 | return retval; | |
1216 | } | |
1217 | ||
e1defc4f | 1218 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1219 | { |
e1defc4f | 1220 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1221 | } |
1222 | ||
c72758f3 MP |
1223 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1224 | { | |
1225 | return q->limits.physical_block_size; | |
1226 | } | |
1227 | ||
892b6f90 | 1228 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1229 | { |
1230 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1231 | } | |
1232 | ||
c72758f3 MP |
1233 | static inline unsigned int queue_io_min(struct request_queue *q) |
1234 | { | |
1235 | return q->limits.io_min; | |
1236 | } | |
1237 | ||
ac481c20 MP |
1238 | static inline int bdev_io_min(struct block_device *bdev) |
1239 | { | |
1240 | return queue_io_min(bdev_get_queue(bdev)); | |
1241 | } | |
1242 | ||
c72758f3 MP |
1243 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1244 | { | |
1245 | return q->limits.io_opt; | |
1246 | } | |
1247 | ||
ac481c20 MP |
1248 | static inline int bdev_io_opt(struct block_device *bdev) |
1249 | { | |
1250 | return queue_io_opt(bdev_get_queue(bdev)); | |
1251 | } | |
1252 | ||
c72758f3 MP |
1253 | static inline int queue_alignment_offset(struct request_queue *q) |
1254 | { | |
ac481c20 | 1255 | if (q->limits.misaligned) |
c72758f3 MP |
1256 | return -1; |
1257 | ||
ac481c20 | 1258 | return q->limits.alignment_offset; |
c72758f3 MP |
1259 | } |
1260 | ||
e03a72e1 | 1261 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1262 | { |
1263 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1264 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1265 | |
e03a72e1 MP |
1266 | return (granularity + lim->alignment_offset - alignment) |
1267 | & (granularity - 1); | |
c72758f3 MP |
1268 | } |
1269 | ||
ac481c20 MP |
1270 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1271 | { | |
1272 | struct request_queue *q = bdev_get_queue(bdev); | |
1273 | ||
1274 | if (q->limits.misaligned) | |
1275 | return -1; | |
1276 | ||
1277 | if (bdev != bdev->bd_contains) | |
1278 | return bdev->bd_part->alignment_offset; | |
1279 | ||
1280 | return q->limits.alignment_offset; | |
1281 | } | |
1282 | ||
86b37281 MP |
1283 | static inline int queue_discard_alignment(struct request_queue *q) |
1284 | { | |
1285 | if (q->limits.discard_misaligned) | |
1286 | return -1; | |
1287 | ||
1288 | return q->limits.discard_alignment; | |
1289 | } | |
1290 | ||
e03a72e1 | 1291 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1292 | { |
59771079 | 1293 | unsigned int alignment, granularity, offset; |
dd3d145d | 1294 | |
a934a00a MP |
1295 | if (!lim->max_discard_sectors) |
1296 | return 0; | |
1297 | ||
59771079 LT |
1298 | /* Why are these in bytes, not sectors? */ |
1299 | alignment = lim->discard_alignment >> 9; | |
1300 | granularity = lim->discard_granularity >> 9; | |
1301 | if (!granularity) | |
1302 | return 0; | |
1303 | ||
1304 | /* Offset of the partition start in 'granularity' sectors */ | |
1305 | offset = sector_div(sector, granularity); | |
1306 | ||
1307 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1308 | offset = (granularity + alignment - offset) % granularity; | |
1309 | ||
1310 | /* Turn it back into bytes, gaah */ | |
1311 | return offset << 9; | |
86b37281 MP |
1312 | } |
1313 | ||
c6e66634 PB |
1314 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1315 | { | |
1316 | struct request_queue *q = bdev_get_queue(bdev); | |
1317 | ||
1318 | if (bdev != bdev->bd_contains) | |
1319 | return bdev->bd_part->discard_alignment; | |
1320 | ||
1321 | return q->limits.discard_alignment; | |
1322 | } | |
1323 | ||
98262f27 MP |
1324 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1325 | { | |
a934a00a | 1326 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1327 | return 1; |
1328 | ||
1329 | return 0; | |
1330 | } | |
1331 | ||
1332 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1333 | { | |
1334 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1335 | } | |
1336 | ||
4363ac7c MP |
1337 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1338 | { | |
1339 | struct request_queue *q = bdev_get_queue(bdev); | |
1340 | ||
1341 | if (q) | |
1342 | return q->limits.max_write_same_sectors; | |
1343 | ||
1344 | return 0; | |
1345 | } | |
1346 | ||
165125e1 | 1347 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1348 | { |
482eb689 | 1349 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1350 | } |
1351 | ||
14417799 | 1352 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1353 | unsigned int len) |
1354 | { | |
1355 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1356 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1357 | } |
1358 | ||
1da177e4 LT |
1359 | /* assumes size > 256 */ |
1360 | static inline unsigned int blksize_bits(unsigned int size) | |
1361 | { | |
1362 | unsigned int bits = 8; | |
1363 | do { | |
1364 | bits++; | |
1365 | size >>= 1; | |
1366 | } while (size > 256); | |
1367 | return bits; | |
1368 | } | |
1369 | ||
2befb9e3 | 1370 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1371 | { |
1372 | return bdev->bd_block_size; | |
1373 | } | |
1374 | ||
f3876930 | 1375 | static inline bool queue_flush_queueable(struct request_queue *q) |
1376 | { | |
1377 | return !q->flush_not_queueable; | |
1378 | } | |
1379 | ||
1da177e4 LT |
1380 | typedef struct {struct page *v;} Sector; |
1381 | ||
1382 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1383 | ||
1384 | static inline void put_dev_sector(Sector p) | |
1385 | { | |
1386 | page_cache_release(p.v); | |
1387 | } | |
1388 | ||
1389 | struct work_struct; | |
59c3d45e JA |
1390 | int kblockd_schedule_work(struct work_struct *work); |
1391 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); | |
8ab14595 | 1392 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1393 | |
9195291e | 1394 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1395 | /* |
1396 | * This should not be using sched_clock(). A real patch is in progress | |
1397 | * to fix this up, until that is in place we need to disable preemption | |
1398 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1399 | */ | |
9195291e DS |
1400 | static inline void set_start_time_ns(struct request *req) |
1401 | { | |
28f4197e | 1402 | preempt_disable(); |
9195291e | 1403 | req->start_time_ns = sched_clock(); |
28f4197e | 1404 | preempt_enable(); |
9195291e DS |
1405 | } |
1406 | ||
1407 | static inline void set_io_start_time_ns(struct request *req) | |
1408 | { | |
28f4197e | 1409 | preempt_disable(); |
9195291e | 1410 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1411 | preempt_enable(); |
9195291e | 1412 | } |
84c124da DS |
1413 | |
1414 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1415 | { | |
1416 | return req->start_time_ns; | |
1417 | } | |
1418 | ||
1419 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1420 | { | |
1421 | return req->io_start_time_ns; | |
1422 | } | |
9195291e DS |
1423 | #else |
1424 | static inline void set_start_time_ns(struct request *req) {} | |
1425 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1426 | static inline uint64_t rq_start_time_ns(struct request *req) |
1427 | { | |
1428 | return 0; | |
1429 | } | |
1430 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1431 | { | |
1432 | return 0; | |
1433 | } | |
9195291e DS |
1434 | #endif |
1435 | ||
1da177e4 LT |
1436 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1437 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1438 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1439 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1440 | ||
7ba1ba12 MP |
1441 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1442 | ||
b24498d4 JA |
1443 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1444 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1445 | |
1446 | struct blk_integrity_exchg { | |
1447 | void *prot_buf; | |
1448 | void *data_buf; | |
1449 | sector_t sector; | |
1450 | unsigned int data_size; | |
1451 | unsigned short sector_size; | |
1452 | const char *disk_name; | |
1453 | }; | |
1454 | ||
1455 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1456 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1457 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1458 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1459 | ||
1460 | struct blk_integrity { | |
1461 | integrity_gen_fn *generate_fn; | |
1462 | integrity_vrfy_fn *verify_fn; | |
1463 | integrity_set_tag_fn *set_tag_fn; | |
1464 | integrity_get_tag_fn *get_tag_fn; | |
1465 | ||
1466 | unsigned short flags; | |
1467 | unsigned short tuple_size; | |
1468 | unsigned short sector_size; | |
1469 | unsigned short tag_size; | |
1470 | ||
1471 | const char *name; | |
1472 | ||
1473 | struct kobject kobj; | |
1474 | }; | |
1475 | ||
a63a5cf8 | 1476 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1477 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1478 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1479 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1480 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1481 | struct scatterlist *); | |
1482 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1483 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1484 | struct request *); | |
1485 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1486 | struct bio *); | |
7ba1ba12 | 1487 | |
b04accc4 JA |
1488 | static inline |
1489 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1490 | { | |
1491 | return bdev->bd_disk->integrity; | |
1492 | } | |
1493 | ||
b02739b0 MP |
1494 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1495 | { | |
1496 | return disk->integrity; | |
1497 | } | |
1498 | ||
7ba1ba12 MP |
1499 | static inline int blk_integrity_rq(struct request *rq) |
1500 | { | |
d442cc44 MP |
1501 | if (rq->bio == NULL) |
1502 | return 0; | |
1503 | ||
7ba1ba12 MP |
1504 | return bio_integrity(rq->bio); |
1505 | } | |
1506 | ||
13f05c8d MP |
1507 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1508 | unsigned int segs) | |
1509 | { | |
1510 | q->limits.max_integrity_segments = segs; | |
1511 | } | |
1512 | ||
1513 | static inline unsigned short | |
1514 | queue_max_integrity_segments(struct request_queue *q) | |
1515 | { | |
1516 | return q->limits.max_integrity_segments; | |
1517 | } | |
1518 | ||
7ba1ba12 MP |
1519 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1520 | ||
fd83240a SR |
1521 | struct bio; |
1522 | struct block_device; | |
1523 | struct gendisk; | |
1524 | struct blk_integrity; | |
1525 | ||
1526 | static inline int blk_integrity_rq(struct request *rq) | |
1527 | { | |
1528 | return 0; | |
1529 | } | |
1530 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1531 | struct bio *b) | |
1532 | { | |
1533 | return 0; | |
1534 | } | |
1535 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1536 | struct bio *b, | |
1537 | struct scatterlist *s) | |
1538 | { | |
1539 | return 0; | |
1540 | } | |
1541 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1542 | { | |
1543 | return 0; | |
1544 | } | |
1545 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1546 | { | |
1547 | return NULL; | |
1548 | } | |
1549 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1550 | { | |
1551 | return 0; | |
1552 | } | |
1553 | static inline int blk_integrity_register(struct gendisk *d, | |
1554 | struct blk_integrity *b) | |
1555 | { | |
1556 | return 0; | |
1557 | } | |
1558 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1559 | { | |
1560 | } | |
1561 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1562 | unsigned int segs) | |
1563 | { | |
1564 | } | |
1565 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1566 | { | |
1567 | return 0; | |
1568 | } | |
1569 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1570 | struct request *r1, | |
1571 | struct request *r2) | |
1572 | { | |
1573 | return 0; | |
1574 | } | |
1575 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1576 | struct request *r, | |
1577 | struct bio *b) | |
1578 | { | |
1579 | return 0; | |
1580 | } | |
1581 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1582 | { | |
1583 | return 0; | |
1584 | } | |
7ba1ba12 MP |
1585 | |
1586 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1587 | ||
08f85851 | 1588 | struct block_device_operations { |
d4430d62 | 1589 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1590 | void (*release) (struct gendisk *, fmode_t); |
d4430d62 AV |
1591 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1592 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1593 | int (*direct_access) (struct block_device *, sector_t, |
1594 | void **, unsigned long *); | |
77ea887e TH |
1595 | unsigned int (*check_events) (struct gendisk *disk, |
1596 | unsigned int clearing); | |
1597 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1598 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1599 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1600 | int (*revalidate_disk) (struct gendisk *); |
1601 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1602 | /* this callback is with swap_lock and sometimes page table lock held */ |
1603 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1604 | struct module *owner; |
1605 | }; | |
1606 | ||
633a08b8 AV |
1607 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1608 | unsigned long); | |
9361401e | 1609 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1610 | |
1611 | struct block_device; | |
1612 | ||
9361401e DH |
1613 | /* |
1614 | * stubs for when the block layer is configured out | |
1615 | */ | |
1616 | #define buffer_heads_over_limit 0 | |
1617 | ||
9361401e DH |
1618 | static inline long nr_blockdev_pages(void) |
1619 | { | |
1620 | return 0; | |
1621 | } | |
1622 | ||
1f940bdf JA |
1623 | struct blk_plug { |
1624 | }; | |
1625 | ||
1626 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1627 | { |
1628 | } | |
1629 | ||
1f940bdf | 1630 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1631 | { |
1632 | } | |
1633 | ||
1f940bdf | 1634 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1635 | { |
1636 | } | |
1637 | ||
a237c1c5 JA |
1638 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1639 | { | |
1640 | } | |
1641 | ||
1642 | ||
73c10101 JA |
1643 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1644 | { | |
1645 | return false; | |
1646 | } | |
1647 | ||
ac13a829 FF |
1648 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1649 | sector_t *error_sector) | |
1650 | { | |
1651 | return 0; | |
1652 | } | |
1653 | ||
9361401e DH |
1654 | #endif /* CONFIG_BLOCK */ |
1655 | ||
1da177e4 | 1656 | #endif |