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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> | |
66114cad | 15 | #include <linux/backing-dev-defs.h> |
1da177e4 LT |
16 | #include <linux/wait.h> |
17 | #include <linux/mempool.h> | |
34c0fd54 | 18 | #include <linux/pfn.h> |
1da177e4 | 19 | #include <linux/bio.h> |
1da177e4 | 20 | #include <linux/stringify.h> |
3e6053d7 | 21 | #include <linux/gfp.h> |
d351af01 | 22 | #include <linux/bsg.h> |
c7c22e4d | 23 | #include <linux/smp.h> |
548bc8e1 | 24 | #include <linux/rcupdate.h> |
add703fd | 25 | #include <linux/percpu-refcount.h> |
84be456f | 26 | #include <linux/scatterlist.h> |
6a0cb1bc | 27 | #include <linux/blkzoned.h> |
1da177e4 | 28 | |
de477254 | 29 | struct module; |
21b2f0c8 CH |
30 | struct scsi_ioctl_command; |
31 | ||
1da177e4 | 32 | struct request_queue; |
1da177e4 | 33 | struct elevator_queue; |
2056a782 | 34 | struct blk_trace; |
3d6392cf JA |
35 | struct request; |
36 | struct sg_io_hdr; | |
aa387cc8 | 37 | struct bsg_job; |
3c798398 | 38 | struct blkcg_gq; |
7c94e1c1 | 39 | struct blk_flush_queue; |
bbd3e064 | 40 | struct pr_ops; |
87760e5e | 41 | struct rq_wb; |
1da177e4 LT |
42 | |
43 | #define BLKDEV_MIN_RQ 4 | |
44 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
45 | ||
8bd435b3 TH |
46 | /* |
47 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
48 | * Defined here to simplify include dependency. | |
49 | */ | |
50 | #define BLKCG_MAX_POLS 2 | |
51 | ||
8ffdc655 | 52 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 53 | |
5b788ce3 TH |
54 | #define BLK_RL_SYNCFULL (1U << 0) |
55 | #define BLK_RL_ASYNCFULL (1U << 1) | |
56 | ||
1da177e4 | 57 | struct request_list { |
5b788ce3 | 58 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
59 | #ifdef CONFIG_BLK_CGROUP |
60 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
61 | #endif | |
1faa16d2 JA |
62 | /* |
63 | * count[], starved[], and wait[] are indexed by | |
64 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
65 | */ | |
8a5ecdd4 TH |
66 | int count[2]; |
67 | int starved[2]; | |
68 | mempool_t *rq_pool; | |
69 | wait_queue_head_t wait[2]; | |
5b788ce3 | 70 | unsigned int flags; |
1da177e4 LT |
71 | }; |
72 | ||
e8064021 CH |
73 | /* |
74 | * request flags */ | |
75 | typedef __u32 __bitwise req_flags_t; | |
76 | ||
77 | /* elevator knows about this request */ | |
78 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
79 | /* drive already may have started this one */ | |
80 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
81 | /* uses tagged queueing */ | |
82 | #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) | |
83 | /* may not be passed by ioscheduler */ | |
84 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
85 | /* request for flush sequence */ | |
86 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
87 | /* merge of different types, fail separately */ | |
88 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
89 | /* track inflight for MQ */ | |
90 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
91 | /* don't call prep for this one */ | |
92 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
93 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
94 | "quiesce" state must be ignored. */ | |
95 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
96 | /* contains copies of user pages */ | |
97 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
98 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
99 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
100 | /* don't warn about errors */ | |
101 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
102 | /* elevator private data attached */ | |
103 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
104 | /* account I/O stat */ | |
105 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) | |
106 | /* request came from our alloc pool */ | |
107 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
108 | /* runtime pm request */ | |
109 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
110 | /* on IO scheduler merge hash */ | |
111 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
cf43e6be JA |
112 | /* IO stats tracking on */ |
113 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) | |
f9d03f96 CH |
114 | /* Look at ->special_vec for the actual data payload instead of the |
115 | bio chain. */ | |
116 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
e8064021 CH |
117 | |
118 | /* flags that prevent us from merging requests: */ | |
119 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 120 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 121 | |
1da177e4 | 122 | /* |
af76e555 CH |
123 | * Try to put the fields that are referenced together in the same cacheline. |
124 | * | |
125 | * If you modify this structure, make sure to update blk_rq_init() and | |
126 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
127 | */ |
128 | struct request { | |
6897fc22 | 129 | struct list_head queuelist; |
320ae51f JA |
130 | union { |
131 | struct call_single_data csd; | |
9828c2c6 | 132 | u64 fifo_time; |
320ae51f | 133 | }; |
ff856bad | 134 | |
165125e1 | 135 | struct request_queue *q; |
320ae51f | 136 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 137 | |
ca93e453 | 138 | int cpu; |
ef295ecf | 139 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 140 | req_flags_t rq_flags; |
242f9dcb | 141 | unsigned long atomic_flags; |
1da177e4 | 142 | |
a2dec7b3 | 143 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 144 | unsigned int __data_len; /* total data len */ |
bd166ef1 | 145 | int tag; |
181fdde3 | 146 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
147 | |
148 | struct bio *bio; | |
149 | struct bio *biotail; | |
150 | ||
360f92c2 JA |
151 | /* |
152 | * The hash is used inside the scheduler, and killed once the | |
153 | * request reaches the dispatch list. The ipi_list is only used | |
154 | * to queue the request for softirq completion, which is long | |
155 | * after the request has been unhashed (and even removed from | |
156 | * the dispatch list). | |
157 | */ | |
158 | union { | |
159 | struct hlist_node hash; /* merge hash */ | |
160 | struct list_head ipi_list; | |
161 | }; | |
162 | ||
e6a1c874 JA |
163 | /* |
164 | * The rb_node is only used inside the io scheduler, requests | |
165 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 166 | * completion_data share space with the rb_node. |
e6a1c874 JA |
167 | */ |
168 | union { | |
169 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 170 | struct bio_vec special_vec; |
c186794d | 171 | void *completion_data; |
e6a1c874 | 172 | }; |
9817064b | 173 | |
ff7d145f | 174 | /* |
7f1dc8a2 | 175 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
176 | * more they have to dynamically allocate it. Flush requests are |
177 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 178 | * space with the elevator data. |
ff7d145f | 179 | */ |
c186794d | 180 | union { |
a612fddf TH |
181 | struct { |
182 | struct io_cq *icq; | |
183 | void *priv[2]; | |
184 | } elv; | |
185 | ||
c186794d MS |
186 | struct { |
187 | unsigned int seq; | |
188 | struct list_head list; | |
4853abaa | 189 | rq_end_io_fn *saved_end_io; |
c186794d MS |
190 | } flush; |
191 | }; | |
ff7d145f | 192 | |
8f34ee75 | 193 | struct gendisk *rq_disk; |
09e099d4 | 194 | struct hd_struct *part; |
1da177e4 | 195 | unsigned long start_time; |
cf43e6be | 196 | struct blk_issue_stat issue_stat; |
9195291e | 197 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 198 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
199 | unsigned long long start_time_ns; |
200 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
201 | #endif | |
1da177e4 LT |
202 | /* Number of scatter-gather DMA addr+len pairs after |
203 | * physical address coalescing is performed. | |
204 | */ | |
205 | unsigned short nr_phys_segments; | |
13f05c8d MP |
206 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
207 | unsigned short nr_integrity_segments; | |
208 | #endif | |
1da177e4 | 209 | |
8f34ee75 JA |
210 | unsigned short ioprio; |
211 | ||
bd166ef1 JA |
212 | int internal_tag; |
213 | ||
731ec497 | 214 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 215 | |
cdd60262 JA |
216 | int errors; |
217 | ||
7a85f889 | 218 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 219 | |
242f9dcb JA |
220 | unsigned long deadline; |
221 | struct list_head timeout_list; | |
1da177e4 | 222 | unsigned int timeout; |
17e01f21 | 223 | int retries; |
1da177e4 | 224 | |
1da177e4 | 225 | /* |
c00895ab | 226 | * completion callback. |
1da177e4 LT |
227 | */ |
228 | rq_end_io_fn *end_io; | |
229 | void *end_io_data; | |
abae1fde FT |
230 | |
231 | /* for bidi */ | |
232 | struct request *next_rq; | |
1da177e4 LT |
233 | }; |
234 | ||
aebf526b CH |
235 | static inline bool blk_rq_is_scsi(struct request *rq) |
236 | { | |
237 | return req_op(rq) == REQ_OP_SCSI_IN || req_op(rq) == REQ_OP_SCSI_OUT; | |
238 | } | |
239 | ||
240 | static inline bool blk_rq_is_private(struct request *rq) | |
241 | { | |
242 | return req_op(rq) == REQ_OP_DRV_IN || req_op(rq) == REQ_OP_DRV_OUT; | |
243 | } | |
244 | ||
57292b58 CH |
245 | static inline bool blk_rq_is_passthrough(struct request *rq) |
246 | { | |
aebf526b | 247 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
248 | } |
249 | ||
766ca442 FLVC |
250 | static inline unsigned short req_get_ioprio(struct request *req) |
251 | { | |
252 | return req->ioprio; | |
253 | } | |
254 | ||
1da177e4 LT |
255 | #include <linux/elevator.h> |
256 | ||
320ae51f JA |
257 | struct blk_queue_ctx; |
258 | ||
165125e1 | 259 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 260 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 261 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 262 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
263 | |
264 | struct bio_vec; | |
ff856bad | 265 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 266 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 267 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 268 | typedef int (bsg_job_fn) (struct bsg_job *); |
6d247d7f CH |
269 | typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t); |
270 | typedef void (exit_rq_fn)(struct request_queue *, struct request *); | |
1da177e4 | 271 | |
242f9dcb JA |
272 | enum blk_eh_timer_return { |
273 | BLK_EH_NOT_HANDLED, | |
274 | BLK_EH_HANDLED, | |
275 | BLK_EH_RESET_TIMER, | |
276 | }; | |
277 | ||
278 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
279 | ||
1da177e4 LT |
280 | enum blk_queue_state { |
281 | Queue_down, | |
282 | Queue_up, | |
283 | }; | |
284 | ||
1da177e4 LT |
285 | struct blk_queue_tag { |
286 | struct request **tag_index; /* map of busy tags */ | |
287 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 | 288 | int max_depth; /* what we will send to device */ |
ba025082 | 289 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 290 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
291 | int alloc_policy; /* tag allocation policy */ |
292 | int next_tag; /* next tag */ | |
1da177e4 | 293 | }; |
ee1b6f7a SL |
294 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
295 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 296 | |
abf54393 FT |
297 | #define BLK_SCSI_MAX_CMDS (256) |
298 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
299 | ||
797476b8 DLM |
300 | /* |
301 | * Zoned block device models (zoned limit). | |
302 | */ | |
303 | enum blk_zoned_model { | |
304 | BLK_ZONED_NONE, /* Regular block device */ | |
305 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
306 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
307 | }; | |
308 | ||
025146e1 MP |
309 | struct queue_limits { |
310 | unsigned long bounce_pfn; | |
311 | unsigned long seg_boundary_mask; | |
03100aad | 312 | unsigned long virt_boundary_mask; |
025146e1 MP |
313 | |
314 | unsigned int max_hw_sectors; | |
ca369d51 | 315 | unsigned int max_dev_sectors; |
762380ad | 316 | unsigned int chunk_sectors; |
025146e1 MP |
317 | unsigned int max_sectors; |
318 | unsigned int max_segment_size; | |
c72758f3 MP |
319 | unsigned int physical_block_size; |
320 | unsigned int alignment_offset; | |
321 | unsigned int io_min; | |
322 | unsigned int io_opt; | |
67efc925 | 323 | unsigned int max_discard_sectors; |
0034af03 | 324 | unsigned int max_hw_discard_sectors; |
4363ac7c | 325 | unsigned int max_write_same_sectors; |
a6f0788e | 326 | unsigned int max_write_zeroes_sectors; |
86b37281 MP |
327 | unsigned int discard_granularity; |
328 | unsigned int discard_alignment; | |
025146e1 MP |
329 | |
330 | unsigned short logical_block_size; | |
8a78362c | 331 | unsigned short max_segments; |
13f05c8d | 332 | unsigned short max_integrity_segments; |
025146e1 | 333 | |
c72758f3 | 334 | unsigned char misaligned; |
86b37281 | 335 | unsigned char discard_misaligned; |
e692cb66 | 336 | unsigned char cluster; |
a934a00a | 337 | unsigned char discard_zeroes_data; |
c78afc62 | 338 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 339 | enum blk_zoned_model zoned; |
025146e1 MP |
340 | }; |
341 | ||
6a0cb1bc HR |
342 | #ifdef CONFIG_BLK_DEV_ZONED |
343 | ||
344 | struct blk_zone_report_hdr { | |
345 | unsigned int nr_zones; | |
346 | u8 padding[60]; | |
347 | }; | |
348 | ||
349 | extern int blkdev_report_zones(struct block_device *bdev, | |
350 | sector_t sector, struct blk_zone *zones, | |
351 | unsigned int *nr_zones, gfp_t gfp_mask); | |
352 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
353 | sector_t nr_sectors, gfp_t gfp_mask); | |
354 | ||
3ed05a98 ST |
355 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
356 | unsigned int cmd, unsigned long arg); | |
357 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
358 | unsigned int cmd, unsigned long arg); | |
359 | ||
360 | #else /* CONFIG_BLK_DEV_ZONED */ | |
361 | ||
362 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, | |
363 | fmode_t mode, unsigned int cmd, | |
364 | unsigned long arg) | |
365 | { | |
366 | return -ENOTTY; | |
367 | } | |
368 | ||
369 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
370 | fmode_t mode, unsigned int cmd, | |
371 | unsigned long arg) | |
372 | { | |
373 | return -ENOTTY; | |
374 | } | |
375 | ||
6a0cb1bc HR |
376 | #endif /* CONFIG_BLK_DEV_ZONED */ |
377 | ||
d7b76301 | 378 | struct request_queue { |
1da177e4 LT |
379 | /* |
380 | * Together with queue_head for cacheline sharing | |
381 | */ | |
382 | struct list_head queue_head; | |
383 | struct request *last_merge; | |
b374d18a | 384 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
385 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
386 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 | 387 | |
87760e5e JA |
388 | struct rq_wb *rq_wb; |
389 | ||
1da177e4 | 390 | /* |
a051661c TH |
391 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
392 | * is used, root blkg allocates from @q->root_rl and all other | |
393 | * blkgs from their own blkg->rl. Which one to use should be | |
394 | * determined using bio_request_list(). | |
1da177e4 | 395 | */ |
a051661c | 396 | struct request_list root_rl; |
1da177e4 LT |
397 | |
398 | request_fn_proc *request_fn; | |
1da177e4 LT |
399 | make_request_fn *make_request_fn; |
400 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 401 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 402 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 403 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 404 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 405 | lld_busy_fn *lld_busy_fn; |
6d247d7f CH |
406 | init_rq_fn *init_rq_fn; |
407 | exit_rq_fn *exit_rq_fn; | |
1da177e4 | 408 | |
f8a5b122 | 409 | const struct blk_mq_ops *mq_ops; |
320ae51f JA |
410 | |
411 | unsigned int *mq_map; | |
412 | ||
413 | /* sw queues */ | |
e6cdb092 | 414 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
415 | unsigned int nr_queues; |
416 | ||
d278d4a8 JA |
417 | unsigned int queue_depth; |
418 | ||
320ae51f JA |
419 | /* hw dispatch queues */ |
420 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
421 | unsigned int nr_hw_queues; | |
422 | ||
8922e16c TH |
423 | /* |
424 | * Dispatch queue sorting | |
425 | */ | |
1b47f531 | 426 | sector_t end_sector; |
8922e16c | 427 | struct request *boundary_rq; |
8922e16c | 428 | |
1da177e4 | 429 | /* |
3cca6dc1 | 430 | * Delayed queue handling |
1da177e4 | 431 | */ |
3cca6dc1 | 432 | struct delayed_work delay_work; |
1da177e4 LT |
433 | |
434 | struct backing_dev_info backing_dev_info; | |
435 | ||
436 | /* | |
437 | * The queue owner gets to use this for whatever they like. | |
438 | * ll_rw_blk doesn't touch it. | |
439 | */ | |
440 | void *queuedata; | |
441 | ||
1da177e4 | 442 | /* |
d7b76301 | 443 | * various queue flags, see QUEUE_* below |
1da177e4 | 444 | */ |
d7b76301 | 445 | unsigned long queue_flags; |
1da177e4 | 446 | |
a73f730d TH |
447 | /* |
448 | * ida allocated id for this queue. Used to index queues from | |
449 | * ioctx. | |
450 | */ | |
451 | int id; | |
452 | ||
1da177e4 | 453 | /* |
d7b76301 | 454 | * queue needs bounce pages for pages above this limit |
1da177e4 | 455 | */ |
d7b76301 | 456 | gfp_t bounce_gfp; |
1da177e4 LT |
457 | |
458 | /* | |
152587de JA |
459 | * protects queue structures from reentrancy. ->__queue_lock should |
460 | * _never_ be used directly, it is queue private. always use | |
461 | * ->queue_lock. | |
1da177e4 | 462 | */ |
152587de | 463 | spinlock_t __queue_lock; |
1da177e4 LT |
464 | spinlock_t *queue_lock; |
465 | ||
466 | /* | |
467 | * queue kobject | |
468 | */ | |
469 | struct kobject kobj; | |
470 | ||
320ae51f JA |
471 | /* |
472 | * mq queue kobject | |
473 | */ | |
474 | struct kobject mq_kobj; | |
475 | ||
ac6fc48c DW |
476 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
477 | struct blk_integrity integrity; | |
478 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
479 | ||
47fafbc7 | 480 | #ifdef CONFIG_PM |
6c954667 LM |
481 | struct device *dev; |
482 | int rpm_status; | |
483 | unsigned int nr_pending; | |
484 | #endif | |
485 | ||
1da177e4 LT |
486 | /* |
487 | * queue settings | |
488 | */ | |
489 | unsigned long nr_requests; /* Max # of requests */ | |
490 | unsigned int nr_congestion_on; | |
491 | unsigned int nr_congestion_off; | |
492 | unsigned int nr_batching; | |
493 | ||
fa0ccd83 | 494 | unsigned int dma_drain_size; |
d7b76301 | 495 | void *dma_drain_buffer; |
e3790c7d | 496 | unsigned int dma_pad_mask; |
1da177e4 LT |
497 | unsigned int dma_alignment; |
498 | ||
499 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 500 | struct list_head tag_busy_list; |
1da177e4 | 501 | |
15853af9 | 502 | unsigned int nr_sorted; |
0a7ae2ff | 503 | unsigned int in_flight[2]; |
cf43e6be JA |
504 | |
505 | struct blk_rq_stat rq_stats[2]; | |
506 | ||
24faf6f6 BVA |
507 | /* |
508 | * Number of active block driver functions for which blk_drain_queue() | |
509 | * must wait. Must be incremented around functions that unlock the | |
510 | * queue_lock internally, e.g. scsi_request_fn(). | |
511 | */ | |
512 | unsigned int request_fn_active; | |
1da177e4 | 513 | |
242f9dcb | 514 | unsigned int rq_timeout; |
64f1c21e | 515 | int poll_nsec; |
242f9dcb | 516 | struct timer_list timeout; |
287922eb | 517 | struct work_struct timeout_work; |
242f9dcb JA |
518 | struct list_head timeout_list; |
519 | ||
a612fddf | 520 | struct list_head icq_list; |
4eef3049 | 521 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 522 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 523 | struct blkcg_gq *root_blkg; |
03aa264a | 524 | struct list_head blkg_list; |
4eef3049 | 525 | #endif |
a612fddf | 526 | |
025146e1 MP |
527 | struct queue_limits limits; |
528 | ||
1da177e4 LT |
529 | /* |
530 | * sg stuff | |
531 | */ | |
532 | unsigned int sg_timeout; | |
533 | unsigned int sg_reserved_size; | |
1946089a | 534 | int node; |
6c5c9341 | 535 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 536 | struct blk_trace *blk_trace; |
6c5c9341 | 537 | #endif |
1da177e4 | 538 | /* |
4913efe4 | 539 | * for flush operations |
1da177e4 | 540 | */ |
7c94e1c1 | 541 | struct blk_flush_queue *fq; |
483f4afc | 542 | |
6fca6a61 CH |
543 | struct list_head requeue_list; |
544 | spinlock_t requeue_lock; | |
2849450a | 545 | struct delayed_work requeue_work; |
6fca6a61 | 546 | |
483f4afc | 547 | struct mutex sysfs_lock; |
d351af01 | 548 | |
d732580b | 549 | int bypass_depth; |
4ecd4fef | 550 | atomic_t mq_freeze_depth; |
d732580b | 551 | |
d351af01 | 552 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
553 | bsg_job_fn *bsg_job_fn; |
554 | int bsg_job_size; | |
d351af01 FT |
555 | struct bsg_class_device bsg_dev; |
556 | #endif | |
e43473b7 VG |
557 | |
558 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
559 | /* Throttle data */ | |
560 | struct throtl_data *td; | |
561 | #endif | |
548bc8e1 | 562 | struct rcu_head rcu_head; |
320ae51f | 563 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 564 | struct percpu_ref q_usage_counter; |
320ae51f | 565 | struct list_head all_q_node; |
0d2602ca JA |
566 | |
567 | struct blk_mq_tag_set *tag_set; | |
568 | struct list_head tag_set_list; | |
54efd50b | 569 | struct bio_set *bio_split; |
4593fdbe | 570 | |
07e4fead OS |
571 | #ifdef CONFIG_DEBUG_FS |
572 | struct dentry *debugfs_dir; | |
573 | struct dentry *mq_debugfs_dir; | |
574 | #endif | |
575 | ||
4593fdbe | 576 | bool mq_sysfs_init_done; |
6d247d7f CH |
577 | |
578 | size_t cmd_size; | |
579 | void *rq_alloc_data; | |
1da177e4 LT |
580 | }; |
581 | ||
1da177e4 LT |
582 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
583 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
584 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
585 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 586 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 587 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
588 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
589 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 590 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
591 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
592 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
593 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 594 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
595 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
596 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
597 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
598 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
288dab8a | 599 | #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */ |
5757a6d7 | 600 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 601 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 602 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 603 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
05229bee | 604 | #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */ |
93e9d8e8 JA |
605 | #define QUEUE_FLAG_WC 23 /* Write back caching */ |
606 | #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */ | |
c888a8f9 | 607 | #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */ |
163d4baa | 608 | #define QUEUE_FLAG_DAX 26 /* device supports DAX */ |
cf43e6be | 609 | #define QUEUE_FLAG_STATS 27 /* track rq completion times */ |
50e1dab8 | 610 | #define QUEUE_FLAG_RESTART 28 /* queue needs restart at completion */ |
bc58ba94 JA |
611 | |
612 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 613 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
614 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
615 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 616 | |
94eddfbe | 617 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 618 | (1 << QUEUE_FLAG_STACKABLE) | \ |
8e0b60b9 CH |
619 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
620 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 621 | |
8bcb6c7d | 622 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 623 | { |
8bcb6c7d AK |
624 | if (q->queue_lock) |
625 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
626 | } |
627 | ||
75ad23bc NP |
628 | static inline void queue_flag_set_unlocked(unsigned int flag, |
629 | struct request_queue *q) | |
630 | { | |
631 | __set_bit(flag, &q->queue_flags); | |
632 | } | |
633 | ||
e48ec690 JA |
634 | static inline int queue_flag_test_and_clear(unsigned int flag, |
635 | struct request_queue *q) | |
636 | { | |
8bcb6c7d | 637 | queue_lockdep_assert_held(q); |
e48ec690 JA |
638 | |
639 | if (test_bit(flag, &q->queue_flags)) { | |
640 | __clear_bit(flag, &q->queue_flags); | |
641 | return 1; | |
642 | } | |
643 | ||
644 | return 0; | |
645 | } | |
646 | ||
647 | static inline int queue_flag_test_and_set(unsigned int flag, | |
648 | struct request_queue *q) | |
649 | { | |
8bcb6c7d | 650 | queue_lockdep_assert_held(q); |
e48ec690 JA |
651 | |
652 | if (!test_bit(flag, &q->queue_flags)) { | |
653 | __set_bit(flag, &q->queue_flags); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | return 1; | |
658 | } | |
659 | ||
75ad23bc NP |
660 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
661 | { | |
8bcb6c7d | 662 | queue_lockdep_assert_held(q); |
75ad23bc NP |
663 | __set_bit(flag, &q->queue_flags); |
664 | } | |
665 | ||
666 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
667 | struct request_queue *q) | |
668 | { | |
669 | __clear_bit(flag, &q->queue_flags); | |
670 | } | |
671 | ||
0a7ae2ff JA |
672 | static inline int queue_in_flight(struct request_queue *q) |
673 | { | |
674 | return q->in_flight[0] + q->in_flight[1]; | |
675 | } | |
676 | ||
75ad23bc NP |
677 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
678 | { | |
8bcb6c7d | 679 | queue_lockdep_assert_held(q); |
75ad23bc NP |
680 | __clear_bit(flag, &q->queue_flags); |
681 | } | |
682 | ||
1da177e4 LT |
683 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
684 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 685 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 686 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 687 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 688 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 689 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
690 | #define blk_queue_noxmerges(q) \ |
691 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 692 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 693 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 694 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
695 | #define blk_queue_stackable(q) \ |
696 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 697 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
698 | #define blk_queue_secure_erase(q) \ |
699 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 700 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
1da177e4 | 701 | |
33659ebb CH |
702 | #define blk_noretry_request(rq) \ |
703 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
704 | REQ_FAILFAST_DRIVER)) | |
705 | ||
57292b58 CH |
706 | static inline bool blk_account_rq(struct request *rq) |
707 | { | |
708 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
709 | } | |
33659ebb | 710 | |
ab780f1e | 711 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 712 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
713 | /* rq->queuelist of dequeued request must be list_empty() */ |
714 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
715 | |
716 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
717 | ||
4e1b2d52 | 718 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 719 | |
49fd524f JA |
720 | /* |
721 | * Driver can handle struct request, if it either has an old style | |
722 | * request_fn defined, or is blk-mq based. | |
723 | */ | |
724 | static inline bool queue_is_rq_based(struct request_queue *q) | |
725 | { | |
726 | return q->request_fn || q->mq_ops; | |
727 | } | |
728 | ||
e692cb66 MP |
729 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
730 | { | |
731 | return q->limits.cluster; | |
732 | } | |
733 | ||
797476b8 DLM |
734 | static inline enum blk_zoned_model |
735 | blk_queue_zoned_model(struct request_queue *q) | |
736 | { | |
737 | return q->limits.zoned; | |
738 | } | |
739 | ||
740 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
741 | { | |
742 | switch (blk_queue_zoned_model(q)) { | |
743 | case BLK_ZONED_HA: | |
744 | case BLK_ZONED_HM: | |
745 | return true; | |
746 | default: | |
747 | return false; | |
748 | } | |
749 | } | |
750 | ||
f99e8648 | 751 | static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
752 | { |
753 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
754 | } | |
755 | ||
1faa16d2 JA |
756 | static inline bool rq_is_sync(struct request *rq) |
757 | { | |
ef295ecf | 758 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
759 | } |
760 | ||
5b788ce3 | 761 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 762 | { |
5b788ce3 TH |
763 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
764 | ||
765 | return rl->flags & flag; | |
1da177e4 LT |
766 | } |
767 | ||
5b788ce3 | 768 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 769 | { |
5b788ce3 TH |
770 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
771 | ||
772 | rl->flags |= flag; | |
1da177e4 LT |
773 | } |
774 | ||
5b788ce3 | 775 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 776 | { |
5b788ce3 TH |
777 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
778 | ||
779 | rl->flags &= ~flag; | |
1da177e4 LT |
780 | } |
781 | ||
e2a60da7 MP |
782 | static inline bool rq_mergeable(struct request *rq) |
783 | { | |
57292b58 | 784 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 785 | return false; |
1da177e4 | 786 | |
3a5e02ce MC |
787 | if (req_op(rq) == REQ_OP_FLUSH) |
788 | return false; | |
789 | ||
a6f0788e CK |
790 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
791 | return false; | |
792 | ||
e2a60da7 | 793 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
794 | return false; |
795 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
796 | return false; |
797 | ||
798 | return true; | |
799 | } | |
1da177e4 | 800 | |
4363ac7c MP |
801 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
802 | { | |
803 | if (bio_data(a) == bio_data(b)) | |
804 | return true; | |
805 | ||
806 | return false; | |
807 | } | |
808 | ||
d278d4a8 JA |
809 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
810 | { | |
811 | if (q->queue_depth) | |
812 | return q->queue_depth; | |
813 | ||
814 | return q->nr_requests; | |
815 | } | |
816 | ||
1da177e4 LT |
817 | /* |
818 | * q->prep_rq_fn return values | |
819 | */ | |
0fb5b1fb MP |
820 | enum { |
821 | BLKPREP_OK, /* serve it */ | |
822 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
823 | BLKPREP_DEFER, /* leave on queue */ | |
824 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
825 | }; | |
1da177e4 LT |
826 | |
827 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
828 | ||
829 | /* | |
830 | * standard bounce addresses: | |
831 | * | |
832 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
833 | * BLK_BOUNCE_ANY : don't bounce anything | |
834 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
835 | */ | |
2472892a AK |
836 | |
837 | #if BITS_PER_LONG == 32 | |
1da177e4 | 838 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
839 | #else |
840 | #define BLK_BOUNCE_HIGH -1ULL | |
841 | #endif | |
842 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 843 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 844 | |
3d6392cf JA |
845 | /* |
846 | * default timeout for SG_IO if none specified | |
847 | */ | |
848 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 849 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 850 | |
2a7326b5 | 851 | #ifdef CONFIG_BOUNCE |
1da177e4 | 852 | extern int init_emergency_isa_pool(void); |
165125e1 | 853 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
854 | #else |
855 | static inline int init_emergency_isa_pool(void) | |
856 | { | |
857 | return 0; | |
858 | } | |
165125e1 | 859 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
860 | { |
861 | } | |
862 | #endif /* CONFIG_MMU */ | |
863 | ||
152e283f FT |
864 | struct rq_map_data { |
865 | struct page **pages; | |
866 | int page_order; | |
867 | int nr_entries; | |
56c451f4 | 868 | unsigned long offset; |
97ae77a1 | 869 | int null_mapped; |
ecb554a8 | 870 | int from_user; |
152e283f FT |
871 | }; |
872 | ||
5705f702 | 873 | struct req_iterator { |
7988613b | 874 | struct bvec_iter iter; |
5705f702 N |
875 | struct bio *bio; |
876 | }; | |
877 | ||
878 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
879 | #define for_each_bio(_bio) \ |
880 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 881 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
882 | if ((rq->bio)) \ |
883 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
884 | ||
5705f702 N |
885 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
886 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 887 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 888 | |
4550dd6c | 889 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 890 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 891 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 892 | |
2d4dc890 IL |
893 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
894 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
895 | #endif | |
896 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
897 | extern void rq_flush_dcache_pages(struct request *rq); | |
898 | #else | |
899 | static inline void rq_flush_dcache_pages(struct request *rq) | |
900 | { | |
901 | } | |
902 | #endif | |
903 | ||
2af3a815 TK |
904 | #ifdef CONFIG_PRINTK |
905 | #define vfs_msg(sb, level, fmt, ...) \ | |
906 | __vfs_msg(sb, level, fmt, ##__VA_ARGS__) | |
907 | #else | |
908 | #define vfs_msg(sb, level, fmt, ...) \ | |
909 | do { \ | |
910 | no_printk(fmt, ##__VA_ARGS__); \ | |
911 | __vfs_msg(sb, "", " "); \ | |
912 | } while (0) | |
913 | #endif | |
914 | ||
1da177e4 LT |
915 | extern int blk_register_queue(struct gendisk *disk); |
916 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 917 | extern blk_qc_t generic_make_request(struct bio *bio); |
2a4aa30c | 918 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 919 | extern void blk_put_request(struct request *); |
165125e1 | 920 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 921 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
165125e1 | 922 | extern void blk_requeue_request(struct request_queue *, struct request *); |
ef9e3fac | 923 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
924 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
925 | struct bio_set *bs, gfp_t gfp_mask, | |
926 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
927 | void *data); | |
928 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
929 | extern int blk_insert_cloned_request(struct request_queue *q, |
930 | struct request *rq); | |
98d61d5b | 931 | extern int blk_rq_append_bio(struct request *rq, struct bio *bio); |
3cca6dc1 | 932 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
54efd50b KO |
933 | extern void blk_queue_split(struct request_queue *, struct bio **, |
934 | struct bio_set *); | |
165125e1 | 935 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 936 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
937 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
938 | unsigned int, void __user *); | |
74f3c8af AV |
939 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
940 | unsigned int, void __user *); | |
e915e872 AV |
941 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
942 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 943 | |
6f3b0e8b | 944 | extern int blk_queue_enter(struct request_queue *q, bool nowait); |
2e6edc95 | 945 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 946 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 947 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 948 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 949 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 950 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 951 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 952 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 953 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 954 | extern void blk_run_queue_async(struct request_queue *q); |
6a83e74d | 955 | extern void blk_mq_quiesce_queue(struct request_queue *q); |
a3bce90e | 956 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
957 | struct rq_map_data *, void __user *, unsigned long, |
958 | gfp_t); | |
8e5cfc45 | 959 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
960 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
961 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
962 | struct rq_map_data *, const struct iov_iter *, |
963 | gfp_t); | |
165125e1 | 964 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 965 | struct request *, int); |
165125e1 | 966 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 967 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 968 | |
bbd7bb70 | 969 | bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie); |
05229bee | 970 | |
165125e1 | 971 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 972 | { |
ff9ea323 | 973 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
974 | } |
975 | ||
5efccd17 | 976 | /* |
80a761fd TH |
977 | * blk_rq_pos() : the current sector |
978 | * blk_rq_bytes() : bytes left in the entire request | |
979 | * blk_rq_cur_bytes() : bytes left in the current segment | |
980 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
981 | * blk_rq_sectors() : sectors left in the entire request | |
982 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 983 | */ |
5b93629b TH |
984 | static inline sector_t blk_rq_pos(const struct request *rq) |
985 | { | |
a2dec7b3 | 986 | return rq->__sector; |
2e46e8b2 TH |
987 | } |
988 | ||
989 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
990 | { | |
a2dec7b3 | 991 | return rq->__data_len; |
5b93629b TH |
992 | } |
993 | ||
2e46e8b2 TH |
994 | static inline int blk_rq_cur_bytes(const struct request *rq) |
995 | { | |
996 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
997 | } | |
5efccd17 | 998 | |
80a761fd TH |
999 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
1000 | ||
5b93629b TH |
1001 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1002 | { | |
2e46e8b2 | 1003 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
1004 | } |
1005 | ||
1006 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
1007 | { | |
2e46e8b2 | 1008 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
1009 | } |
1010 | ||
2e3258ec CH |
1011 | /* |
1012 | * Some commands like WRITE SAME have a payload or data transfer size which | |
1013 | * is different from the size of the request. Any driver that supports such | |
1014 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
1015 | * calculate the data transfer size. | |
1016 | */ | |
1017 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
1018 | { | |
1019 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1020 | return rq->special_vec.bv_len; | |
1021 | return blk_rq_bytes(rq); | |
1022 | } | |
1023 | ||
f31dc1cd | 1024 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 1025 | int op) |
f31dc1cd | 1026 | { |
7afafc8a | 1027 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
871dd928 | 1028 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 1029 | |
8fe0d473 | 1030 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1031 | return q->limits.max_write_same_sectors; |
1032 | ||
a6f0788e CK |
1033 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1034 | return q->limits.max_write_zeroes_sectors; | |
1035 | ||
f31dc1cd MP |
1036 | return q->limits.max_sectors; |
1037 | } | |
1038 | ||
762380ad JA |
1039 | /* |
1040 | * Return maximum size of a request at given offset. Only valid for | |
1041 | * file system requests. | |
1042 | */ | |
1043 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1044 | sector_t offset) | |
1045 | { | |
1046 | if (!q->limits.chunk_sectors) | |
736ed4de | 1047 | return q->limits.max_sectors; |
762380ad JA |
1048 | |
1049 | return q->limits.chunk_sectors - | |
1050 | (offset & (q->limits.chunk_sectors - 1)); | |
1051 | } | |
1052 | ||
17007f39 DLM |
1053 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1054 | sector_t offset) | |
f31dc1cd MP |
1055 | { |
1056 | struct request_queue *q = rq->q; | |
1057 | ||
57292b58 | 1058 | if (blk_rq_is_passthrough(rq)) |
f31dc1cd MP |
1059 | return q->limits.max_hw_sectors; |
1060 | ||
7afafc8a AH |
1061 | if (!q->limits.chunk_sectors || |
1062 | req_op(rq) == REQ_OP_DISCARD || | |
1063 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1064 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1065 | |
17007f39 | 1066 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1067 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1068 | } |
1069 | ||
75afb352 JN |
1070 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1071 | { | |
1072 | unsigned int nr_bios = 0; | |
1073 | struct bio *bio; | |
1074 | ||
1075 | __rq_for_each_bio(bio, rq) | |
1076 | nr_bios++; | |
1077 | ||
1078 | return nr_bios; | |
1079 | } | |
1080 | ||
5dc8b362 AM |
1081 | /* |
1082 | * blk_rq_set_prio - associate a request with prio from ioc | |
1083 | * @rq: request of interest | |
1084 | * @ioc: target iocontext | |
1085 | * | |
1086 | * Assocate request prio with ioc prio so request based drivers | |
1087 | * can leverage priority information. | |
1088 | */ | |
1089 | static inline void blk_rq_set_prio(struct request *rq, struct io_context *ioc) | |
1090 | { | |
1091 | if (ioc) | |
1092 | rq->ioprio = ioc->ioprio; | |
1093 | } | |
1094 | ||
9934c8c0 TH |
1095 | /* |
1096 | * Request issue related functions. | |
1097 | */ | |
1098 | extern struct request *blk_peek_request(struct request_queue *q); | |
1099 | extern void blk_start_request(struct request *rq); | |
1100 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1101 | ||
1da177e4 | 1102 | /* |
2e60e022 TH |
1103 | * Request completion related functions. |
1104 | * | |
1105 | * blk_update_request() completes given number of bytes and updates | |
1106 | * the request without completing it. | |
1107 | * | |
f06d9a2b TH |
1108 | * blk_end_request() and friends. __blk_end_request() must be called |
1109 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1110 | * |
1111 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1112 | * blk_end_request() for parts of the original function. |
1113 | * This prevents code duplication in drivers. | |
1da177e4 | 1114 | */ |
2e60e022 TH |
1115 | extern bool blk_update_request(struct request *rq, int error, |
1116 | unsigned int nr_bytes); | |
12120077 | 1117 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
1118 | extern bool blk_end_request(struct request *rq, int error, |
1119 | unsigned int nr_bytes); | |
1120 | extern void blk_end_request_all(struct request *rq, int error); | |
1121 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1122 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
1123 | extern bool __blk_end_request(struct request *rq, int error, |
1124 | unsigned int nr_bytes); | |
1125 | extern void __blk_end_request_all(struct request *rq, int error); | |
1126 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1127 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 1128 | |
ff856bad | 1129 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1130 | extern void __blk_complete_request(struct request *); |
1131 | extern void blk_abort_request(struct request *); | |
28018c24 | 1132 | extern void blk_unprep_request(struct request *); |
ff856bad | 1133 | |
1da177e4 LT |
1134 | /* |
1135 | * Access functions for manipulating queue properties | |
1136 | */ | |
165125e1 | 1137 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1138 | spinlock_t *lock, int node_id); |
165125e1 | 1139 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
5ea708d1 | 1140 | extern int blk_init_allocated_queue(struct request_queue *); |
165125e1 JA |
1141 | extern void blk_cleanup_queue(struct request_queue *); |
1142 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1143 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1144 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1145 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1146 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 1147 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1148 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1149 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1150 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1151 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1152 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1153 | unsigned int max_write_same_sectors); | |
e1defc4f | 1154 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1155 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1156 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1157 | unsigned int alignment); | |
7c958e32 | 1158 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1159 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1160 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1161 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1162 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1163 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1164 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1165 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1166 | sector_t offset); | |
17be8c24 MP |
1167 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1168 | sector_t offset); | |
c72758f3 MP |
1169 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1170 | sector_t offset); | |
165125e1 | 1171 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1172 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1173 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1174 | extern int blk_queue_dma_drain(struct request_queue *q, |
1175 | dma_drain_needed_fn *dma_drain_needed, | |
1176 | void *buf, unsigned int size); | |
ef9e3fac | 1177 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1178 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1179 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1180 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1181 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1182 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1183 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1184 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1185 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1186 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1187 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1188 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1189 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1190 | |
f9d03f96 CH |
1191 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1192 | { | |
1193 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1194 | return 1; | |
1195 | return rq->nr_phys_segments; | |
1196 | } | |
1197 | ||
165125e1 | 1198 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1199 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1200 | extern long nr_blockdev_pages(void); |
1da177e4 | 1201 | |
09ac46c4 | 1202 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1203 | struct request_queue *blk_alloc_queue(gfp_t); |
1204 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1205 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1206 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1207 | |
6c954667 LM |
1208 | /* |
1209 | * block layer runtime pm functions | |
1210 | */ | |
47fafbc7 | 1211 | #ifdef CONFIG_PM |
6c954667 LM |
1212 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1213 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1214 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1215 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1216 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
d07ab6d1 | 1217 | extern void blk_set_runtime_active(struct request_queue *q); |
6c954667 LM |
1218 | #else |
1219 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1220 | struct device *dev) {} | |
1221 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1222 | { | |
1223 | return -ENOSYS; | |
1224 | } | |
1225 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1226 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1227 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
9a05e754 | 1228 | static inline void blk_set_runtime_active(struct request_queue *q) {} |
6c954667 LM |
1229 | #endif |
1230 | ||
316cc67d | 1231 | /* |
75df7136 SJ |
1232 | * blk_plug permits building a queue of related requests by holding the I/O |
1233 | * fragments for a short period. This allows merging of sequential requests | |
1234 | * into single larger request. As the requests are moved from a per-task list to | |
1235 | * the device's request_queue in a batch, this results in improved scalability | |
1236 | * as the lock contention for request_queue lock is reduced. | |
1237 | * | |
1238 | * It is ok not to disable preemption when adding the request to the plug list | |
1239 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1240 | * the plug list when the task sleeps by itself. For details, please see | |
1241 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1242 | */ |
73c10101 | 1243 | struct blk_plug { |
75df7136 | 1244 | struct list_head list; /* requests */ |
320ae51f | 1245 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1246 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1247 | }; |
55c022bb | 1248 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1249 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1250 | |
9cbb1750 | 1251 | struct blk_plug_cb; |
74018dc3 | 1252 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1253 | struct blk_plug_cb { |
1254 | struct list_head list; | |
9cbb1750 N |
1255 | blk_plug_cb_fn callback; |
1256 | void *data; | |
048c9374 | 1257 | }; |
9cbb1750 N |
1258 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1259 | void *data, int size); | |
73c10101 JA |
1260 | extern void blk_start_plug(struct blk_plug *); |
1261 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1262 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1263 | |
1264 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1265 | { | |
1266 | struct blk_plug *plug = tsk->plug; | |
1267 | ||
a237c1c5 JA |
1268 | if (plug) |
1269 | blk_flush_plug_list(plug, false); | |
1270 | } | |
1271 | ||
1272 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1273 | { | |
1274 | struct blk_plug *plug = tsk->plug; | |
1275 | ||
88b996cd | 1276 | if (plug) |
f6603783 | 1277 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1278 | } |
1279 | ||
1280 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1281 | { | |
1282 | struct blk_plug *plug = tsk->plug; | |
1283 | ||
320ae51f JA |
1284 | return plug && |
1285 | (!list_empty(&plug->list) || | |
1286 | !list_empty(&plug->mq_list) || | |
1287 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1288 | } |
1289 | ||
1da177e4 LT |
1290 | /* |
1291 | * tag stuff | |
1292 | */ | |
165125e1 JA |
1293 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1294 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1295 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1296 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1297 | extern void blk_queue_free_tags(struct request_queue *); |
1298 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1299 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1300 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1301 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1302 | |
f583f492 DS |
1303 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1304 | int tag) | |
1305 | { | |
1306 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1307 | return NULL; | |
1308 | return bqt->tag_index[tag]; | |
1309 | } | |
dd3932ed | 1310 | |
e950fdf7 CH |
1311 | |
1312 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
1313 | #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */ | |
dd3932ed CH |
1314 | |
1315 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1316 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1317 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1318 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1319 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1320 | struct bio **biop); |
4363ac7c MP |
1321 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1322 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e73c23ff CK |
1323 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1324 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
1325 | bool discard); | |
3f14d792 | 1326 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1327 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1328 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1329 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1330 | { |
2cf6d26a CH |
1331 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1332 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1333 | gfp_mask, flags); | |
fb2dce86 | 1334 | } |
e6fa0be6 | 1335 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1336 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1337 | { |
1338 | return blkdev_issue_zeroout(sb->s_bdev, | |
1339 | block << (sb->s_blocksize_bits - 9), | |
1340 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1341 | gfp_mask, true); |
e6fa0be6 | 1342 | } |
1da177e4 | 1343 | |
018e0446 | 1344 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1345 | |
eb28d31b MP |
1346 | enum blk_default_limits { |
1347 | BLK_MAX_SEGMENTS = 128, | |
1348 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1349 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1350 | BLK_MAX_SEGMENT_SIZE = 65536, |
1351 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1352 | }; | |
0e435ac2 | 1353 | |
1da177e4 LT |
1354 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1355 | ||
ae03bf63 MP |
1356 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1357 | { | |
025146e1 | 1358 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1359 | } |
1360 | ||
1361 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1362 | { | |
025146e1 | 1363 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1364 | } |
1365 | ||
03100aad KB |
1366 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1367 | { | |
1368 | return q->limits.virt_boundary_mask; | |
1369 | } | |
1370 | ||
ae03bf63 MP |
1371 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1372 | { | |
025146e1 | 1373 | return q->limits.max_sectors; |
ae03bf63 MP |
1374 | } |
1375 | ||
1376 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1377 | { | |
025146e1 | 1378 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1379 | } |
1380 | ||
8a78362c | 1381 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1382 | { |
8a78362c | 1383 | return q->limits.max_segments; |
ae03bf63 MP |
1384 | } |
1385 | ||
1386 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1387 | { | |
025146e1 | 1388 | return q->limits.max_segment_size; |
ae03bf63 MP |
1389 | } |
1390 | ||
e1defc4f | 1391 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1392 | { |
1393 | int retval = 512; | |
1394 | ||
025146e1 MP |
1395 | if (q && q->limits.logical_block_size) |
1396 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1397 | |
1398 | return retval; | |
1399 | } | |
1400 | ||
e1defc4f | 1401 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1402 | { |
e1defc4f | 1403 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1404 | } |
1405 | ||
c72758f3 MP |
1406 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1407 | { | |
1408 | return q->limits.physical_block_size; | |
1409 | } | |
1410 | ||
892b6f90 | 1411 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1412 | { |
1413 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1414 | } | |
1415 | ||
c72758f3 MP |
1416 | static inline unsigned int queue_io_min(struct request_queue *q) |
1417 | { | |
1418 | return q->limits.io_min; | |
1419 | } | |
1420 | ||
ac481c20 MP |
1421 | static inline int bdev_io_min(struct block_device *bdev) |
1422 | { | |
1423 | return queue_io_min(bdev_get_queue(bdev)); | |
1424 | } | |
1425 | ||
c72758f3 MP |
1426 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1427 | { | |
1428 | return q->limits.io_opt; | |
1429 | } | |
1430 | ||
ac481c20 MP |
1431 | static inline int bdev_io_opt(struct block_device *bdev) |
1432 | { | |
1433 | return queue_io_opt(bdev_get_queue(bdev)); | |
1434 | } | |
1435 | ||
c72758f3 MP |
1436 | static inline int queue_alignment_offset(struct request_queue *q) |
1437 | { | |
ac481c20 | 1438 | if (q->limits.misaligned) |
c72758f3 MP |
1439 | return -1; |
1440 | ||
ac481c20 | 1441 | return q->limits.alignment_offset; |
c72758f3 MP |
1442 | } |
1443 | ||
e03a72e1 | 1444 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1445 | { |
1446 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1447 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1448 | |
b8839b8c | 1449 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1450 | } |
1451 | ||
ac481c20 MP |
1452 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1453 | { | |
1454 | struct request_queue *q = bdev_get_queue(bdev); | |
1455 | ||
1456 | if (q->limits.misaligned) | |
1457 | return -1; | |
1458 | ||
1459 | if (bdev != bdev->bd_contains) | |
1460 | return bdev->bd_part->alignment_offset; | |
1461 | ||
1462 | return q->limits.alignment_offset; | |
1463 | } | |
1464 | ||
86b37281 MP |
1465 | static inline int queue_discard_alignment(struct request_queue *q) |
1466 | { | |
1467 | if (q->limits.discard_misaligned) | |
1468 | return -1; | |
1469 | ||
1470 | return q->limits.discard_alignment; | |
1471 | } | |
1472 | ||
e03a72e1 | 1473 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1474 | { |
59771079 | 1475 | unsigned int alignment, granularity, offset; |
dd3d145d | 1476 | |
a934a00a MP |
1477 | if (!lim->max_discard_sectors) |
1478 | return 0; | |
1479 | ||
59771079 LT |
1480 | /* Why are these in bytes, not sectors? */ |
1481 | alignment = lim->discard_alignment >> 9; | |
1482 | granularity = lim->discard_granularity >> 9; | |
1483 | if (!granularity) | |
1484 | return 0; | |
1485 | ||
1486 | /* Offset of the partition start in 'granularity' sectors */ | |
1487 | offset = sector_div(sector, granularity); | |
1488 | ||
1489 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1490 | offset = (granularity + alignment - offset) % granularity; | |
1491 | ||
1492 | /* Turn it back into bytes, gaah */ | |
1493 | return offset << 9; | |
86b37281 MP |
1494 | } |
1495 | ||
c6e66634 PB |
1496 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1497 | { | |
1498 | struct request_queue *q = bdev_get_queue(bdev); | |
1499 | ||
1500 | if (bdev != bdev->bd_contains) | |
1501 | return bdev->bd_part->discard_alignment; | |
1502 | ||
1503 | return q->limits.discard_alignment; | |
1504 | } | |
1505 | ||
98262f27 MP |
1506 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1507 | { | |
a934a00a | 1508 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1509 | return 1; |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1515 | { | |
1516 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1517 | } | |
1518 | ||
4363ac7c MP |
1519 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1520 | { | |
1521 | struct request_queue *q = bdev_get_queue(bdev); | |
1522 | ||
1523 | if (q) | |
1524 | return q->limits.max_write_same_sectors; | |
1525 | ||
1526 | return 0; | |
1527 | } | |
1528 | ||
a6f0788e CK |
1529 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1530 | { | |
1531 | struct request_queue *q = bdev_get_queue(bdev); | |
1532 | ||
1533 | if (q) | |
1534 | return q->limits.max_write_zeroes_sectors; | |
1535 | ||
1536 | return 0; | |
1537 | } | |
1538 | ||
797476b8 DLM |
1539 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1540 | { | |
1541 | struct request_queue *q = bdev_get_queue(bdev); | |
1542 | ||
1543 | if (q) | |
1544 | return blk_queue_zoned_model(q); | |
1545 | ||
1546 | return BLK_ZONED_NONE; | |
1547 | } | |
1548 | ||
1549 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1550 | { | |
1551 | struct request_queue *q = bdev_get_queue(bdev); | |
1552 | ||
1553 | if (q) | |
1554 | return blk_queue_is_zoned(q); | |
1555 | ||
1556 | return false; | |
1557 | } | |
1558 | ||
f99e8648 | 1559 | static inline unsigned int bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1560 | { |
1561 | struct request_queue *q = bdev_get_queue(bdev); | |
1562 | ||
1563 | if (q) | |
f99e8648 | 1564 | return blk_queue_zone_sectors(q); |
6a0cb1bc HR |
1565 | |
1566 | return 0; | |
1567 | } | |
1568 | ||
165125e1 | 1569 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1570 | { |
482eb689 | 1571 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1572 | } |
1573 | ||
14417799 | 1574 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1575 | unsigned int len) |
1576 | { | |
1577 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1578 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1579 | } |
1580 | ||
1da177e4 LT |
1581 | /* assumes size > 256 */ |
1582 | static inline unsigned int blksize_bits(unsigned int size) | |
1583 | { | |
1584 | unsigned int bits = 8; | |
1585 | do { | |
1586 | bits++; | |
1587 | size >>= 1; | |
1588 | } while (size > 256); | |
1589 | return bits; | |
1590 | } | |
1591 | ||
2befb9e3 | 1592 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1593 | { |
1594 | return bdev->bd_block_size; | |
1595 | } | |
1596 | ||
f3876930 | 1597 | static inline bool queue_flush_queueable(struct request_queue *q) |
1598 | { | |
c888a8f9 | 1599 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1600 | } |
1601 | ||
1da177e4 LT |
1602 | typedef struct {struct page *v;} Sector; |
1603 | ||
1604 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1605 | ||
1606 | static inline void put_dev_sector(Sector p) | |
1607 | { | |
09cbfeaf | 1608 | put_page(p.v); |
1da177e4 LT |
1609 | } |
1610 | ||
e0af2917 ML |
1611 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
1612 | struct bio_vec *bprv, unsigned int offset) | |
1613 | { | |
1614 | return offset || | |
1615 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); | |
1616 | } | |
1617 | ||
03100aad KB |
1618 | /* |
1619 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
1620 | * the SG list. Most drivers don't care about this, but some do. | |
1621 | */ | |
1622 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
1623 | struct bio_vec *bprv, unsigned int offset) | |
1624 | { | |
1625 | if (!queue_virt_boundary(q)) | |
1626 | return false; | |
e0af2917 | 1627 | return __bvec_gap_to_prev(q, bprv, offset); |
03100aad KB |
1628 | } |
1629 | ||
729204ef ML |
1630 | /* |
1631 | * Check if the two bvecs from two bios can be merged to one segment. | |
1632 | * If yes, no need to check gap between the two bios since the 1st bio | |
1633 | * and the 1st bvec in the 2nd bio can be handled in one segment. | |
1634 | */ | |
1635 | static inline bool bios_segs_mergeable(struct request_queue *q, | |
1636 | struct bio *prev, struct bio_vec *prev_last_bv, | |
1637 | struct bio_vec *next_first_bv) | |
1638 | { | |
1639 | if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv)) | |
1640 | return false; | |
1641 | if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv)) | |
1642 | return false; | |
1643 | if (prev->bi_seg_back_size + next_first_bv->bv_len > | |
1644 | queue_max_segment_size(q)) | |
1645 | return false; | |
1646 | return true; | |
1647 | } | |
1648 | ||
5e7c4274 JA |
1649 | static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, |
1650 | struct bio *next) | |
1651 | { | |
25e71a99 ML |
1652 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
1653 | struct bio_vec pb, nb; | |
1654 | ||
1655 | bio_get_last_bvec(prev, &pb); | |
1656 | bio_get_first_bvec(next, &nb); | |
5e7c4274 | 1657 | |
729204ef ML |
1658 | if (!bios_segs_mergeable(q, prev, &pb, &nb)) |
1659 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); | |
25e71a99 ML |
1660 | } |
1661 | ||
1662 | return false; | |
5e7c4274 JA |
1663 | } |
1664 | ||
1665 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) | |
1666 | { | |
1667 | return bio_will_gap(req->q, req->biotail, bio); | |
1668 | } | |
1669 | ||
1670 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) | |
1671 | { | |
1672 | return bio_will_gap(req->q, bio, req->bio); | |
1673 | } | |
1674 | ||
59c3d45e | 1675 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1676 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
59c3d45e | 1677 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
8ab14595 | 1678 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1679 | |
9195291e | 1680 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1681 | /* |
1682 | * This should not be using sched_clock(). A real patch is in progress | |
1683 | * to fix this up, until that is in place we need to disable preemption | |
1684 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1685 | */ | |
9195291e DS |
1686 | static inline void set_start_time_ns(struct request *req) |
1687 | { | |
28f4197e | 1688 | preempt_disable(); |
9195291e | 1689 | req->start_time_ns = sched_clock(); |
28f4197e | 1690 | preempt_enable(); |
9195291e DS |
1691 | } |
1692 | ||
1693 | static inline void set_io_start_time_ns(struct request *req) | |
1694 | { | |
28f4197e | 1695 | preempt_disable(); |
9195291e | 1696 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1697 | preempt_enable(); |
9195291e | 1698 | } |
84c124da DS |
1699 | |
1700 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1701 | { | |
1702 | return req->start_time_ns; | |
1703 | } | |
1704 | ||
1705 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1706 | { | |
1707 | return req->io_start_time_ns; | |
1708 | } | |
9195291e DS |
1709 | #else |
1710 | static inline void set_start_time_ns(struct request *req) {} | |
1711 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1712 | static inline uint64_t rq_start_time_ns(struct request *req) |
1713 | { | |
1714 | return 0; | |
1715 | } | |
1716 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1717 | { | |
1718 | return 0; | |
1719 | } | |
9195291e DS |
1720 | #endif |
1721 | ||
1da177e4 LT |
1722 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1723 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1724 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1725 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1726 | ||
7ba1ba12 MP |
1727 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1728 | ||
8288f496 MP |
1729 | enum blk_integrity_flags { |
1730 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1731 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1732 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1733 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1734 | }; |
7ba1ba12 | 1735 | |
18593088 | 1736 | struct blk_integrity_iter { |
7ba1ba12 MP |
1737 | void *prot_buf; |
1738 | void *data_buf; | |
3be91c4a | 1739 | sector_t seed; |
7ba1ba12 | 1740 | unsigned int data_size; |
3be91c4a | 1741 | unsigned short interval; |
7ba1ba12 MP |
1742 | const char *disk_name; |
1743 | }; | |
1744 | ||
18593088 | 1745 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1746 | |
0f8087ec MP |
1747 | struct blk_integrity_profile { |
1748 | integrity_processing_fn *generate_fn; | |
1749 | integrity_processing_fn *verify_fn; | |
1750 | const char *name; | |
1751 | }; | |
7ba1ba12 | 1752 | |
25520d55 | 1753 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1754 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1755 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1756 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1757 | struct scatterlist *); | |
1758 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1759 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1760 | struct request *); | |
1761 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1762 | struct bio *); | |
7ba1ba12 | 1763 | |
25520d55 | 1764 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1765 | { |
ac6fc48c | 1766 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1767 | |
1768 | if (!bi->profile) | |
1769 | return NULL; | |
1770 | ||
1771 | return bi; | |
b04accc4 JA |
1772 | } |
1773 | ||
25520d55 MP |
1774 | static inline |
1775 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1776 | { |
25520d55 | 1777 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1778 | } |
1779 | ||
180b2f95 | 1780 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1781 | { |
180b2f95 | 1782 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1783 | } |
1784 | ||
13f05c8d MP |
1785 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1786 | unsigned int segs) | |
1787 | { | |
1788 | q->limits.max_integrity_segments = segs; | |
1789 | } | |
1790 | ||
1791 | static inline unsigned short | |
1792 | queue_max_integrity_segments(struct request_queue *q) | |
1793 | { | |
1794 | return q->limits.max_integrity_segments; | |
1795 | } | |
1796 | ||
7f39add3 SG |
1797 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1798 | struct bio *next) | |
1799 | { | |
1800 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
1801 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
1802 | ||
1803 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1804 | bip_next->bip_vec[0].bv_offset); | |
1805 | } | |
1806 | ||
1807 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1808 | struct bio *bio) | |
1809 | { | |
1810 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1811 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
1812 | ||
1813 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1814 | bip_next->bip_vec[0].bv_offset); | |
1815 | } | |
1816 | ||
7ba1ba12 MP |
1817 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1818 | ||
fd83240a SR |
1819 | struct bio; |
1820 | struct block_device; | |
1821 | struct gendisk; | |
1822 | struct blk_integrity; | |
1823 | ||
1824 | static inline int blk_integrity_rq(struct request *rq) | |
1825 | { | |
1826 | return 0; | |
1827 | } | |
1828 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1829 | struct bio *b) | |
1830 | { | |
1831 | return 0; | |
1832 | } | |
1833 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1834 | struct bio *b, | |
1835 | struct scatterlist *s) | |
1836 | { | |
1837 | return 0; | |
1838 | } | |
1839 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1840 | { | |
61a04e5b | 1841 | return NULL; |
fd83240a SR |
1842 | } |
1843 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1844 | { | |
1845 | return NULL; | |
1846 | } | |
1847 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1848 | { | |
1849 | return 0; | |
1850 | } | |
25520d55 | 1851 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1852 | struct blk_integrity *b) |
1853 | { | |
fd83240a SR |
1854 | } |
1855 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1856 | { | |
1857 | } | |
1858 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1859 | unsigned int segs) | |
1860 | { | |
1861 | } | |
1862 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1863 | { | |
1864 | return 0; | |
1865 | } | |
4eaf99be MP |
1866 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1867 | struct request *r1, | |
1868 | struct request *r2) | |
fd83240a | 1869 | { |
cb1a5ab6 | 1870 | return true; |
fd83240a | 1871 | } |
4eaf99be MP |
1872 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1873 | struct request *r, | |
1874 | struct bio *b) | |
fd83240a | 1875 | { |
cb1a5ab6 | 1876 | return true; |
fd83240a | 1877 | } |
25520d55 | 1878 | |
7f39add3 SG |
1879 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1880 | struct bio *next) | |
1881 | { | |
1882 | return false; | |
1883 | } | |
1884 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1885 | struct bio *bio) | |
1886 | { | |
1887 | return false; | |
1888 | } | |
7ba1ba12 MP |
1889 | |
1890 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1891 | ||
b2e0d162 DW |
1892 | /** |
1893 | * struct blk_dax_ctl - control and output parameters for ->direct_access | |
1894 | * @sector: (input) offset relative to a block_device | |
1895 | * @addr: (output) kernel virtual address for @sector populated by driver | |
1896 | * @pfn: (output) page frame number for @addr populated by driver | |
1897 | * @size: (input) number of bytes requested | |
1898 | */ | |
1899 | struct blk_dax_ctl { | |
1900 | sector_t sector; | |
7a9eb206 | 1901 | void *addr; |
b2e0d162 | 1902 | long size; |
34c0fd54 | 1903 | pfn_t pfn; |
b2e0d162 DW |
1904 | }; |
1905 | ||
08f85851 | 1906 | struct block_device_operations { |
d4430d62 | 1907 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1908 | void (*release) (struct gendisk *, fmode_t); |
c11f0c0b | 1909 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
d4430d62 AV |
1910 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1911 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
7a9eb206 DW |
1912 | long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, |
1913 | long); | |
77ea887e TH |
1914 | unsigned int (*check_events) (struct gendisk *disk, |
1915 | unsigned int clearing); | |
1916 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1917 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1918 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1919 | int (*revalidate_disk) (struct gendisk *); |
1920 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1921 | /* this callback is with swap_lock and sometimes page table lock held */ |
1922 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 | 1923 | struct module *owner; |
bbd3e064 | 1924 | const struct pr_ops *pr_ops; |
08f85851 AV |
1925 | }; |
1926 | ||
633a08b8 AV |
1927 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1928 | unsigned long); | |
47a191fd MW |
1929 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1930 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1931 | struct writeback_control *); | |
b2e0d162 | 1932 | extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); |
2d96afc8 | 1933 | extern int bdev_dax_supported(struct super_block *, int); |
a8078b1f | 1934 | extern bool bdev_dax_capable(struct block_device *); |
9361401e | 1935 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1936 | |
1937 | struct block_device; | |
1938 | ||
9361401e DH |
1939 | /* |
1940 | * stubs for when the block layer is configured out | |
1941 | */ | |
1942 | #define buffer_heads_over_limit 0 | |
1943 | ||
9361401e DH |
1944 | static inline long nr_blockdev_pages(void) |
1945 | { | |
1946 | return 0; | |
1947 | } | |
1948 | ||
1f940bdf JA |
1949 | struct blk_plug { |
1950 | }; | |
1951 | ||
1952 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1953 | { |
1954 | } | |
1955 | ||
1f940bdf | 1956 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1957 | { |
1958 | } | |
1959 | ||
1f940bdf | 1960 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1961 | { |
1962 | } | |
1963 | ||
a237c1c5 JA |
1964 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1965 | { | |
1966 | } | |
1967 | ||
1968 | ||
73c10101 JA |
1969 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1970 | { | |
1971 | return false; | |
1972 | } | |
1973 | ||
ac13a829 FF |
1974 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1975 | sector_t *error_sector) | |
1976 | { | |
1977 | return 0; | |
1978 | } | |
1979 | ||
9361401e DH |
1980 | #endif /* CONFIG_BLOCK */ |
1981 | ||
1da177e4 | 1982 | #endif |