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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; |
1da177e4 LT |
41 | |
42 | #define BLKDEV_MIN_RQ 4 | |
43 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
44 | ||
8bd435b3 TH |
45 | /* |
46 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
47 | * Defined here to simplify include dependency. | |
48 | */ | |
49 | #define BLKCG_MAX_POLS 2 | |
50 | ||
8ffdc655 | 51 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 52 | |
5b788ce3 TH |
53 | #define BLK_RL_SYNCFULL (1U << 0) |
54 | #define BLK_RL_ASYNCFULL (1U << 1) | |
55 | ||
1da177e4 | 56 | struct request_list { |
5b788ce3 | 57 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
58 | #ifdef CONFIG_BLK_CGROUP |
59 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
60 | #endif | |
1faa16d2 JA |
61 | /* |
62 | * count[], starved[], and wait[] are indexed by | |
63 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
64 | */ | |
8a5ecdd4 TH |
65 | int count[2]; |
66 | int starved[2]; | |
67 | mempool_t *rq_pool; | |
68 | wait_queue_head_t wait[2]; | |
5b788ce3 | 69 | unsigned int flags; |
1da177e4 LT |
70 | }; |
71 | ||
4aff5e23 JA |
72 | /* |
73 | * request command types | |
74 | */ | |
75 | enum rq_cmd_type_bits { | |
76 | REQ_TYPE_FS = 1, /* fs request */ | |
77 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
b42171ef | 78 | REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
4aff5e23 JA |
79 | }; |
80 | ||
e8064021 CH |
81 | /* |
82 | * request flags */ | |
83 | typedef __u32 __bitwise req_flags_t; | |
84 | ||
85 | /* elevator knows about this request */ | |
86 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
87 | /* drive already may have started this one */ | |
88 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
89 | /* uses tagged queueing */ | |
90 | #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) | |
91 | /* may not be passed by ioscheduler */ | |
92 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
93 | /* request for flush sequence */ | |
94 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
95 | /* merge of different types, fail separately */ | |
96 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
97 | /* track inflight for MQ */ | |
98 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
99 | /* don't call prep for this one */ | |
100 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
101 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
102 | "quiesce" state must be ignored. */ | |
103 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
104 | /* contains copies of user pages */ | |
105 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
106 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
107 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
108 | /* don't warn about errors */ | |
109 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
110 | /* elevator private data attached */ | |
111 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
112 | /* account I/O stat */ | |
113 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) | |
114 | /* request came from our alloc pool */ | |
115 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
116 | /* runtime pm request */ | |
117 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
118 | /* on IO scheduler merge hash */ | |
119 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
120 | ||
121 | /* flags that prevent us from merging requests: */ | |
122 | #define RQF_NOMERGE_FLAGS \ | |
123 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ) | |
124 | ||
1da177e4 LT |
125 | #define BLK_MAX_CDB 16 |
126 | ||
127 | /* | |
af76e555 CH |
128 | * Try to put the fields that are referenced together in the same cacheline. |
129 | * | |
130 | * If you modify this structure, make sure to update blk_rq_init() and | |
131 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
132 | */ |
133 | struct request { | |
6897fc22 | 134 | struct list_head queuelist; |
320ae51f JA |
135 | union { |
136 | struct call_single_data csd; | |
9828c2c6 | 137 | u64 fifo_time; |
320ae51f | 138 | }; |
ff856bad | 139 | |
165125e1 | 140 | struct request_queue *q; |
320ae51f | 141 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 142 | |
ca93e453 | 143 | int cpu; |
b42171ef | 144 | unsigned cmd_type; |
ef295ecf | 145 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 146 | req_flags_t rq_flags; |
242f9dcb | 147 | unsigned long atomic_flags; |
1da177e4 | 148 | |
a2dec7b3 | 149 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 150 | unsigned int __data_len; /* total data len */ |
181fdde3 | 151 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
152 | |
153 | struct bio *bio; | |
154 | struct bio *biotail; | |
155 | ||
360f92c2 JA |
156 | /* |
157 | * The hash is used inside the scheduler, and killed once the | |
158 | * request reaches the dispatch list. The ipi_list is only used | |
159 | * to queue the request for softirq completion, which is long | |
160 | * after the request has been unhashed (and even removed from | |
161 | * the dispatch list). | |
162 | */ | |
163 | union { | |
164 | struct hlist_node hash; /* merge hash */ | |
165 | struct list_head ipi_list; | |
166 | }; | |
167 | ||
e6a1c874 JA |
168 | /* |
169 | * The rb_node is only used inside the io scheduler, requests | |
170 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 171 | * completion_data share space with the rb_node. |
e6a1c874 JA |
172 | */ |
173 | union { | |
174 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 175 | void *completion_data; |
e6a1c874 | 176 | }; |
9817064b | 177 | |
ff7d145f | 178 | /* |
7f1dc8a2 | 179 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
180 | * more they have to dynamically allocate it. Flush requests are |
181 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 182 | * space with the elevator data. |
ff7d145f | 183 | */ |
c186794d | 184 | union { |
a612fddf TH |
185 | struct { |
186 | struct io_cq *icq; | |
187 | void *priv[2]; | |
188 | } elv; | |
189 | ||
c186794d MS |
190 | struct { |
191 | unsigned int seq; | |
192 | struct list_head list; | |
4853abaa | 193 | rq_end_io_fn *saved_end_io; |
c186794d MS |
194 | } flush; |
195 | }; | |
ff7d145f | 196 | |
8f34ee75 | 197 | struct gendisk *rq_disk; |
09e099d4 | 198 | struct hd_struct *part; |
1da177e4 | 199 | unsigned long start_time; |
9195291e | 200 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 201 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
202 | unsigned long long start_time_ns; |
203 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
204 | #endif | |
1da177e4 LT |
205 | /* Number of scatter-gather DMA addr+len pairs after |
206 | * physical address coalescing is performed. | |
207 | */ | |
208 | unsigned short nr_phys_segments; | |
13f05c8d MP |
209 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
210 | unsigned short nr_integrity_segments; | |
211 | #endif | |
1da177e4 | 212 | |
8f34ee75 JA |
213 | unsigned short ioprio; |
214 | ||
731ec497 | 215 | void *special; /* opaque pointer available for LLD use */ |
1da177e4 | 216 | |
cdd60262 JA |
217 | int tag; |
218 | int errors; | |
219 | ||
1da177e4 LT |
220 | /* |
221 | * when request is used as a packet command carrier | |
222 | */ | |
d7e3c324 FT |
223 | unsigned char __cmd[BLK_MAX_CDB]; |
224 | unsigned char *cmd; | |
181fdde3 | 225 | unsigned short cmd_len; |
1da177e4 | 226 | |
7a85f889 | 227 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 228 | unsigned int sense_len; |
c3a4d78c | 229 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
230 | void *sense; |
231 | ||
242f9dcb JA |
232 | unsigned long deadline; |
233 | struct list_head timeout_list; | |
1da177e4 | 234 | unsigned int timeout; |
17e01f21 | 235 | int retries; |
1da177e4 | 236 | |
1da177e4 | 237 | /* |
c00895ab | 238 | * completion callback. |
1da177e4 LT |
239 | */ |
240 | rq_end_io_fn *end_io; | |
241 | void *end_io_data; | |
abae1fde FT |
242 | |
243 | /* for bidi */ | |
244 | struct request *next_rq; | |
1da177e4 LT |
245 | }; |
246 | ||
766ca442 FLVC |
247 | static inline unsigned short req_get_ioprio(struct request *req) |
248 | { | |
249 | return req->ioprio; | |
250 | } | |
251 | ||
1da177e4 LT |
252 | #include <linux/elevator.h> |
253 | ||
320ae51f JA |
254 | struct blk_queue_ctx; |
255 | ||
165125e1 | 256 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 257 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 258 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 259 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
260 | |
261 | struct bio_vec; | |
ff856bad | 262 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 263 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 264 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 265 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 266 | |
242f9dcb JA |
267 | enum blk_eh_timer_return { |
268 | BLK_EH_NOT_HANDLED, | |
269 | BLK_EH_HANDLED, | |
270 | BLK_EH_RESET_TIMER, | |
271 | }; | |
272 | ||
273 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
274 | ||
1da177e4 LT |
275 | enum blk_queue_state { |
276 | Queue_down, | |
277 | Queue_up, | |
278 | }; | |
279 | ||
1da177e4 LT |
280 | struct blk_queue_tag { |
281 | struct request **tag_index; /* map of busy tags */ | |
282 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
283 | int busy; /* current depth */ |
284 | int max_depth; /* what we will send to device */ | |
ba025082 | 285 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 286 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
287 | int alloc_policy; /* tag allocation policy */ |
288 | int next_tag; /* next tag */ | |
1da177e4 | 289 | }; |
ee1b6f7a SL |
290 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
291 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 292 | |
abf54393 FT |
293 | #define BLK_SCSI_MAX_CMDS (256) |
294 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
295 | ||
797476b8 DLM |
296 | /* |
297 | * Zoned block device models (zoned limit). | |
298 | */ | |
299 | enum blk_zoned_model { | |
300 | BLK_ZONED_NONE, /* Regular block device */ | |
301 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
302 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
303 | }; | |
304 | ||
025146e1 MP |
305 | struct queue_limits { |
306 | unsigned long bounce_pfn; | |
307 | unsigned long seg_boundary_mask; | |
03100aad | 308 | unsigned long virt_boundary_mask; |
025146e1 MP |
309 | |
310 | unsigned int max_hw_sectors; | |
ca369d51 | 311 | unsigned int max_dev_sectors; |
762380ad | 312 | unsigned int chunk_sectors; |
025146e1 MP |
313 | unsigned int max_sectors; |
314 | unsigned int max_segment_size; | |
c72758f3 MP |
315 | unsigned int physical_block_size; |
316 | unsigned int alignment_offset; | |
317 | unsigned int io_min; | |
318 | unsigned int io_opt; | |
67efc925 | 319 | unsigned int max_discard_sectors; |
0034af03 | 320 | unsigned int max_hw_discard_sectors; |
4363ac7c | 321 | unsigned int max_write_same_sectors; |
86b37281 MP |
322 | unsigned int discard_granularity; |
323 | unsigned int discard_alignment; | |
025146e1 MP |
324 | |
325 | unsigned short logical_block_size; | |
8a78362c | 326 | unsigned short max_segments; |
13f05c8d | 327 | unsigned short max_integrity_segments; |
025146e1 | 328 | |
c72758f3 | 329 | unsigned char misaligned; |
86b37281 | 330 | unsigned char discard_misaligned; |
e692cb66 | 331 | unsigned char cluster; |
a934a00a | 332 | unsigned char discard_zeroes_data; |
c78afc62 | 333 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 334 | enum blk_zoned_model zoned; |
025146e1 MP |
335 | }; |
336 | ||
6a0cb1bc HR |
337 | #ifdef CONFIG_BLK_DEV_ZONED |
338 | ||
339 | struct blk_zone_report_hdr { | |
340 | unsigned int nr_zones; | |
341 | u8 padding[60]; | |
342 | }; | |
343 | ||
344 | extern int blkdev_report_zones(struct block_device *bdev, | |
345 | sector_t sector, struct blk_zone *zones, | |
346 | unsigned int *nr_zones, gfp_t gfp_mask); | |
347 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
348 | sector_t nr_sectors, gfp_t gfp_mask); | |
349 | ||
3ed05a98 ST |
350 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
351 | unsigned int cmd, unsigned long arg); | |
352 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
353 | unsigned int cmd, unsigned long arg); | |
354 | ||
355 | #else /* CONFIG_BLK_DEV_ZONED */ | |
356 | ||
357 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, | |
358 | fmode_t mode, unsigned int cmd, | |
359 | unsigned long arg) | |
360 | { | |
361 | return -ENOTTY; | |
362 | } | |
363 | ||
364 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
365 | fmode_t mode, unsigned int cmd, | |
366 | unsigned long arg) | |
367 | { | |
368 | return -ENOTTY; | |
369 | } | |
370 | ||
6a0cb1bc HR |
371 | #endif /* CONFIG_BLK_DEV_ZONED */ |
372 | ||
d7b76301 | 373 | struct request_queue { |
1da177e4 LT |
374 | /* |
375 | * Together with queue_head for cacheline sharing | |
376 | */ | |
377 | struct list_head queue_head; | |
378 | struct request *last_merge; | |
b374d18a | 379 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
380 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
381 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
382 | |
383 | /* | |
a051661c TH |
384 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
385 | * is used, root blkg allocates from @q->root_rl and all other | |
386 | * blkgs from their own blkg->rl. Which one to use should be | |
387 | * determined using bio_request_list(). | |
1da177e4 | 388 | */ |
a051661c | 389 | struct request_list root_rl; |
1da177e4 LT |
390 | |
391 | request_fn_proc *request_fn; | |
1da177e4 LT |
392 | make_request_fn *make_request_fn; |
393 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 394 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 395 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 396 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 397 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 398 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 399 | |
320ae51f JA |
400 | struct blk_mq_ops *mq_ops; |
401 | ||
402 | unsigned int *mq_map; | |
403 | ||
404 | /* sw queues */ | |
e6cdb092 | 405 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
406 | unsigned int nr_queues; |
407 | ||
408 | /* hw dispatch queues */ | |
409 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
410 | unsigned int nr_hw_queues; | |
411 | ||
8922e16c TH |
412 | /* |
413 | * Dispatch queue sorting | |
414 | */ | |
1b47f531 | 415 | sector_t end_sector; |
8922e16c | 416 | struct request *boundary_rq; |
8922e16c | 417 | |
1da177e4 | 418 | /* |
3cca6dc1 | 419 | * Delayed queue handling |
1da177e4 | 420 | */ |
3cca6dc1 | 421 | struct delayed_work delay_work; |
1da177e4 LT |
422 | |
423 | struct backing_dev_info backing_dev_info; | |
424 | ||
425 | /* | |
426 | * The queue owner gets to use this for whatever they like. | |
427 | * ll_rw_blk doesn't touch it. | |
428 | */ | |
429 | void *queuedata; | |
430 | ||
1da177e4 | 431 | /* |
d7b76301 | 432 | * various queue flags, see QUEUE_* below |
1da177e4 | 433 | */ |
d7b76301 | 434 | unsigned long queue_flags; |
1da177e4 | 435 | |
a73f730d TH |
436 | /* |
437 | * ida allocated id for this queue. Used to index queues from | |
438 | * ioctx. | |
439 | */ | |
440 | int id; | |
441 | ||
1da177e4 | 442 | /* |
d7b76301 | 443 | * queue needs bounce pages for pages above this limit |
1da177e4 | 444 | */ |
d7b76301 | 445 | gfp_t bounce_gfp; |
1da177e4 LT |
446 | |
447 | /* | |
152587de JA |
448 | * protects queue structures from reentrancy. ->__queue_lock should |
449 | * _never_ be used directly, it is queue private. always use | |
450 | * ->queue_lock. | |
1da177e4 | 451 | */ |
152587de | 452 | spinlock_t __queue_lock; |
1da177e4 LT |
453 | spinlock_t *queue_lock; |
454 | ||
455 | /* | |
456 | * queue kobject | |
457 | */ | |
458 | struct kobject kobj; | |
459 | ||
320ae51f JA |
460 | /* |
461 | * mq queue kobject | |
462 | */ | |
463 | struct kobject mq_kobj; | |
464 | ||
ac6fc48c DW |
465 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
466 | struct blk_integrity integrity; | |
467 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
468 | ||
47fafbc7 | 469 | #ifdef CONFIG_PM |
6c954667 LM |
470 | struct device *dev; |
471 | int rpm_status; | |
472 | unsigned int nr_pending; | |
473 | #endif | |
474 | ||
1da177e4 LT |
475 | /* |
476 | * queue settings | |
477 | */ | |
478 | unsigned long nr_requests; /* Max # of requests */ | |
479 | unsigned int nr_congestion_on; | |
480 | unsigned int nr_congestion_off; | |
481 | unsigned int nr_batching; | |
482 | ||
fa0ccd83 | 483 | unsigned int dma_drain_size; |
d7b76301 | 484 | void *dma_drain_buffer; |
e3790c7d | 485 | unsigned int dma_pad_mask; |
1da177e4 LT |
486 | unsigned int dma_alignment; |
487 | ||
488 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 489 | struct list_head tag_busy_list; |
1da177e4 | 490 | |
15853af9 | 491 | unsigned int nr_sorted; |
0a7ae2ff | 492 | unsigned int in_flight[2]; |
24faf6f6 BVA |
493 | /* |
494 | * Number of active block driver functions for which blk_drain_queue() | |
495 | * must wait. Must be incremented around functions that unlock the | |
496 | * queue_lock internally, e.g. scsi_request_fn(). | |
497 | */ | |
498 | unsigned int request_fn_active; | |
1da177e4 | 499 | |
242f9dcb JA |
500 | unsigned int rq_timeout; |
501 | struct timer_list timeout; | |
287922eb | 502 | struct work_struct timeout_work; |
242f9dcb JA |
503 | struct list_head timeout_list; |
504 | ||
a612fddf | 505 | struct list_head icq_list; |
4eef3049 | 506 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 507 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 508 | struct blkcg_gq *root_blkg; |
03aa264a | 509 | struct list_head blkg_list; |
4eef3049 | 510 | #endif |
a612fddf | 511 | |
025146e1 MP |
512 | struct queue_limits limits; |
513 | ||
1da177e4 LT |
514 | /* |
515 | * sg stuff | |
516 | */ | |
517 | unsigned int sg_timeout; | |
518 | unsigned int sg_reserved_size; | |
1946089a | 519 | int node; |
6c5c9341 | 520 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 521 | struct blk_trace *blk_trace; |
6c5c9341 | 522 | #endif |
1da177e4 | 523 | /* |
4913efe4 | 524 | * for flush operations |
1da177e4 | 525 | */ |
7c94e1c1 | 526 | struct blk_flush_queue *fq; |
483f4afc | 527 | |
6fca6a61 CH |
528 | struct list_head requeue_list; |
529 | spinlock_t requeue_lock; | |
2849450a | 530 | struct delayed_work requeue_work; |
6fca6a61 | 531 | |
483f4afc | 532 | struct mutex sysfs_lock; |
d351af01 | 533 | |
d732580b | 534 | int bypass_depth; |
4ecd4fef | 535 | atomic_t mq_freeze_depth; |
d732580b | 536 | |
d351af01 | 537 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
538 | bsg_job_fn *bsg_job_fn; |
539 | int bsg_job_size; | |
d351af01 FT |
540 | struct bsg_class_device bsg_dev; |
541 | #endif | |
e43473b7 VG |
542 | |
543 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
544 | /* Throttle data */ | |
545 | struct throtl_data *td; | |
546 | #endif | |
548bc8e1 | 547 | struct rcu_head rcu_head; |
320ae51f | 548 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 549 | struct percpu_ref q_usage_counter; |
320ae51f | 550 | struct list_head all_q_node; |
0d2602ca JA |
551 | |
552 | struct blk_mq_tag_set *tag_set; | |
553 | struct list_head tag_set_list; | |
54efd50b | 554 | struct bio_set *bio_split; |
4593fdbe AM |
555 | |
556 | bool mq_sysfs_init_done; | |
1da177e4 LT |
557 | }; |
558 | ||
1da177e4 LT |
559 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
560 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
561 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
562 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 563 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 564 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
565 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
566 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 567 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
568 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
569 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
570 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 571 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
572 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
573 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
574 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
575 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
288dab8a | 576 | #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */ |
5757a6d7 | 577 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 578 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 579 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 580 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
05229bee | 581 | #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */ |
93e9d8e8 JA |
582 | #define QUEUE_FLAG_WC 23 /* Write back caching */ |
583 | #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */ | |
c888a8f9 | 584 | #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */ |
163d4baa | 585 | #define QUEUE_FLAG_DAX 26 /* device supports DAX */ |
bc58ba94 JA |
586 | |
587 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 588 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
589 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
590 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 591 | |
94eddfbe | 592 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 593 | (1 << QUEUE_FLAG_STACKABLE) | \ |
8e0b60b9 CH |
594 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
595 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 596 | |
8bcb6c7d | 597 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 598 | { |
8bcb6c7d AK |
599 | if (q->queue_lock) |
600 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
601 | } |
602 | ||
75ad23bc NP |
603 | static inline void queue_flag_set_unlocked(unsigned int flag, |
604 | struct request_queue *q) | |
605 | { | |
606 | __set_bit(flag, &q->queue_flags); | |
607 | } | |
608 | ||
e48ec690 JA |
609 | static inline int queue_flag_test_and_clear(unsigned int flag, |
610 | struct request_queue *q) | |
611 | { | |
8bcb6c7d | 612 | queue_lockdep_assert_held(q); |
e48ec690 JA |
613 | |
614 | if (test_bit(flag, &q->queue_flags)) { | |
615 | __clear_bit(flag, &q->queue_flags); | |
616 | return 1; | |
617 | } | |
618 | ||
619 | return 0; | |
620 | } | |
621 | ||
622 | static inline int queue_flag_test_and_set(unsigned int flag, | |
623 | struct request_queue *q) | |
624 | { | |
8bcb6c7d | 625 | queue_lockdep_assert_held(q); |
e48ec690 JA |
626 | |
627 | if (!test_bit(flag, &q->queue_flags)) { | |
628 | __set_bit(flag, &q->queue_flags); | |
629 | return 0; | |
630 | } | |
631 | ||
632 | return 1; | |
633 | } | |
634 | ||
75ad23bc NP |
635 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
636 | { | |
8bcb6c7d | 637 | queue_lockdep_assert_held(q); |
75ad23bc NP |
638 | __set_bit(flag, &q->queue_flags); |
639 | } | |
640 | ||
641 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
642 | struct request_queue *q) | |
643 | { | |
644 | __clear_bit(flag, &q->queue_flags); | |
645 | } | |
646 | ||
0a7ae2ff JA |
647 | static inline int queue_in_flight(struct request_queue *q) |
648 | { | |
649 | return q->in_flight[0] + q->in_flight[1]; | |
650 | } | |
651 | ||
75ad23bc NP |
652 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
653 | { | |
8bcb6c7d | 654 | queue_lockdep_assert_held(q); |
75ad23bc NP |
655 | __clear_bit(flag, &q->queue_flags); |
656 | } | |
657 | ||
1da177e4 LT |
658 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
659 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 660 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 661 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 662 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 663 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 664 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
665 | #define blk_queue_noxmerges(q) \ |
666 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 667 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 668 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 669 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
670 | #define blk_queue_stackable(q) \ |
671 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 672 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
673 | #define blk_queue_secure_erase(q) \ |
674 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 675 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
1da177e4 | 676 | |
33659ebb CH |
677 | #define blk_noretry_request(rq) \ |
678 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
679 | REQ_FAILFAST_DRIVER)) | |
680 | ||
681 | #define blk_account_rq(rq) \ | |
e8064021 | 682 | (((rq)->rq_flags & RQF_STARTED) && \ |
e2a60da7 | 683 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 684 | |
ab780f1e | 685 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 686 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
687 | /* rq->queuelist of dequeued request must be list_empty() */ |
688 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
689 | |
690 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
691 | ||
4e1b2d52 | 692 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 693 | |
49fd524f JA |
694 | /* |
695 | * Driver can handle struct request, if it either has an old style | |
696 | * request_fn defined, or is blk-mq based. | |
697 | */ | |
698 | static inline bool queue_is_rq_based(struct request_queue *q) | |
699 | { | |
700 | return q->request_fn || q->mq_ops; | |
701 | } | |
702 | ||
e692cb66 MP |
703 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
704 | { | |
705 | return q->limits.cluster; | |
706 | } | |
707 | ||
797476b8 DLM |
708 | static inline enum blk_zoned_model |
709 | blk_queue_zoned_model(struct request_queue *q) | |
710 | { | |
711 | return q->limits.zoned; | |
712 | } | |
713 | ||
714 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
715 | { | |
716 | switch (blk_queue_zoned_model(q)) { | |
717 | case BLK_ZONED_HA: | |
718 | case BLK_ZONED_HM: | |
719 | return true; | |
720 | default: | |
721 | return false; | |
722 | } | |
723 | } | |
724 | ||
6a0cb1bc HR |
725 | static inline unsigned int blk_queue_zone_size(struct request_queue *q) |
726 | { | |
727 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
728 | } | |
729 | ||
1faa16d2 JA |
730 | static inline bool rq_is_sync(struct request *rq) |
731 | { | |
ef295ecf | 732 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
733 | } |
734 | ||
5b788ce3 | 735 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 736 | { |
5b788ce3 TH |
737 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
738 | ||
739 | return rl->flags & flag; | |
1da177e4 LT |
740 | } |
741 | ||
5b788ce3 | 742 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 743 | { |
5b788ce3 TH |
744 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
745 | ||
746 | rl->flags |= flag; | |
1da177e4 LT |
747 | } |
748 | ||
5b788ce3 | 749 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 750 | { |
5b788ce3 TH |
751 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
752 | ||
753 | rl->flags &= ~flag; | |
1da177e4 LT |
754 | } |
755 | ||
e2a60da7 MP |
756 | static inline bool rq_mergeable(struct request *rq) |
757 | { | |
758 | if (rq->cmd_type != REQ_TYPE_FS) | |
759 | return false; | |
1da177e4 | 760 | |
3a5e02ce MC |
761 | if (req_op(rq) == REQ_OP_FLUSH) |
762 | return false; | |
763 | ||
e2a60da7 | 764 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
765 | return false; |
766 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
767 | return false; |
768 | ||
769 | return true; | |
770 | } | |
1da177e4 | 771 | |
4363ac7c MP |
772 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
773 | { | |
774 | if (bio_data(a) == bio_data(b)) | |
775 | return true; | |
776 | ||
777 | return false; | |
778 | } | |
779 | ||
1da177e4 LT |
780 | /* |
781 | * q->prep_rq_fn return values | |
782 | */ | |
0fb5b1fb MP |
783 | enum { |
784 | BLKPREP_OK, /* serve it */ | |
785 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
786 | BLKPREP_DEFER, /* leave on queue */ | |
787 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
788 | }; | |
1da177e4 LT |
789 | |
790 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
791 | ||
792 | /* | |
793 | * standard bounce addresses: | |
794 | * | |
795 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
796 | * BLK_BOUNCE_ANY : don't bounce anything | |
797 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
798 | */ | |
2472892a AK |
799 | |
800 | #if BITS_PER_LONG == 32 | |
1da177e4 | 801 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
802 | #else |
803 | #define BLK_BOUNCE_HIGH -1ULL | |
804 | #endif | |
805 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 806 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 807 | |
3d6392cf JA |
808 | /* |
809 | * default timeout for SG_IO if none specified | |
810 | */ | |
811 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 812 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 813 | |
2a7326b5 | 814 | #ifdef CONFIG_BOUNCE |
1da177e4 | 815 | extern int init_emergency_isa_pool(void); |
165125e1 | 816 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
817 | #else |
818 | static inline int init_emergency_isa_pool(void) | |
819 | { | |
820 | return 0; | |
821 | } | |
165125e1 | 822 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
823 | { |
824 | } | |
825 | #endif /* CONFIG_MMU */ | |
826 | ||
152e283f FT |
827 | struct rq_map_data { |
828 | struct page **pages; | |
829 | int page_order; | |
830 | int nr_entries; | |
56c451f4 | 831 | unsigned long offset; |
97ae77a1 | 832 | int null_mapped; |
ecb554a8 | 833 | int from_user; |
152e283f FT |
834 | }; |
835 | ||
5705f702 | 836 | struct req_iterator { |
7988613b | 837 | struct bvec_iter iter; |
5705f702 N |
838 | struct bio *bio; |
839 | }; | |
840 | ||
841 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
842 | #define for_each_bio(_bio) \ |
843 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 844 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
845 | if ((rq->bio)) \ |
846 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
847 | ||
5705f702 N |
848 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
849 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 850 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 851 | |
4550dd6c | 852 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 853 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 854 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 855 | |
2d4dc890 IL |
856 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
857 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
858 | #endif | |
859 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
860 | extern void rq_flush_dcache_pages(struct request *rq); | |
861 | #else | |
862 | static inline void rq_flush_dcache_pages(struct request *rq) | |
863 | { | |
864 | } | |
865 | #endif | |
866 | ||
2af3a815 TK |
867 | #ifdef CONFIG_PRINTK |
868 | #define vfs_msg(sb, level, fmt, ...) \ | |
869 | __vfs_msg(sb, level, fmt, ##__VA_ARGS__) | |
870 | #else | |
871 | #define vfs_msg(sb, level, fmt, ...) \ | |
872 | do { \ | |
873 | no_printk(fmt, ##__VA_ARGS__); \ | |
874 | __vfs_msg(sb, "", " "); \ | |
875 | } while (0) | |
876 | #endif | |
877 | ||
1da177e4 LT |
878 | extern int blk_register_queue(struct gendisk *disk); |
879 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 880 | extern blk_qc_t generic_make_request(struct bio *bio); |
2a4aa30c | 881 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 882 | extern void blk_put_request(struct request *); |
165125e1 | 883 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 884 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
f27b087b | 885 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 886 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 | 887 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
37e58237 | 888 | int offset, unsigned int len); |
ef9e3fac | 889 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
890 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
891 | struct bio_set *bs, gfp_t gfp_mask, | |
892 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
893 | void *data); | |
894 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
895 | extern int blk_insert_cloned_request(struct request_queue *q, |
896 | struct request *rq); | |
98d61d5b | 897 | extern int blk_rq_append_bio(struct request *rq, struct bio *bio); |
3cca6dc1 | 898 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
54efd50b KO |
899 | extern void blk_queue_split(struct request_queue *, struct bio **, |
900 | struct bio_set *); | |
165125e1 | 901 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 902 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
903 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
904 | unsigned int, void __user *); | |
74f3c8af AV |
905 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
906 | unsigned int, void __user *); | |
e915e872 AV |
907 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
908 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 909 | |
6f3b0e8b | 910 | extern int blk_queue_enter(struct request_queue *q, bool nowait); |
2e6edc95 | 911 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 912 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 913 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 914 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 915 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 916 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 917 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 918 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 919 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 920 | extern void blk_run_queue_async(struct request_queue *q); |
6a83e74d | 921 | extern void blk_mq_quiesce_queue(struct request_queue *q); |
a3bce90e | 922 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
923 | struct rq_map_data *, void __user *, unsigned long, |
924 | gfp_t); | |
8e5cfc45 | 925 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
926 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
927 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
928 | struct rq_map_data *, const struct iov_iter *, |
929 | gfp_t); | |
165125e1 | 930 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 931 | struct request *, int); |
165125e1 | 932 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 933 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 934 | |
05229bee JA |
935 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
936 | ||
165125e1 | 937 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 938 | { |
ff9ea323 | 939 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
940 | } |
941 | ||
5efccd17 | 942 | /* |
80a761fd TH |
943 | * blk_rq_pos() : the current sector |
944 | * blk_rq_bytes() : bytes left in the entire request | |
945 | * blk_rq_cur_bytes() : bytes left in the current segment | |
946 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
947 | * blk_rq_sectors() : sectors left in the entire request | |
948 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 949 | */ |
5b93629b TH |
950 | static inline sector_t blk_rq_pos(const struct request *rq) |
951 | { | |
a2dec7b3 | 952 | return rq->__sector; |
2e46e8b2 TH |
953 | } |
954 | ||
955 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
956 | { | |
a2dec7b3 | 957 | return rq->__data_len; |
5b93629b TH |
958 | } |
959 | ||
2e46e8b2 TH |
960 | static inline int blk_rq_cur_bytes(const struct request *rq) |
961 | { | |
962 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
963 | } | |
5efccd17 | 964 | |
80a761fd TH |
965 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
966 | ||
5b93629b TH |
967 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
968 | { | |
2e46e8b2 | 969 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
970 | } |
971 | ||
972 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
973 | { | |
2e46e8b2 | 974 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
975 | } |
976 | ||
f31dc1cd | 977 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 978 | int op) |
f31dc1cd | 979 | { |
7afafc8a | 980 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
871dd928 | 981 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 982 | |
8fe0d473 | 983 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
984 | return q->limits.max_write_same_sectors; |
985 | ||
f31dc1cd MP |
986 | return q->limits.max_sectors; |
987 | } | |
988 | ||
762380ad JA |
989 | /* |
990 | * Return maximum size of a request at given offset. Only valid for | |
991 | * file system requests. | |
992 | */ | |
993 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
994 | sector_t offset) | |
995 | { | |
996 | if (!q->limits.chunk_sectors) | |
736ed4de | 997 | return q->limits.max_sectors; |
762380ad JA |
998 | |
999 | return q->limits.chunk_sectors - | |
1000 | (offset & (q->limits.chunk_sectors - 1)); | |
1001 | } | |
1002 | ||
17007f39 DLM |
1003 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1004 | sector_t offset) | |
f31dc1cd MP |
1005 | { |
1006 | struct request_queue *q = rq->q; | |
1007 | ||
f2101842 | 1008 | if (unlikely(rq->cmd_type != REQ_TYPE_FS)) |
f31dc1cd MP |
1009 | return q->limits.max_hw_sectors; |
1010 | ||
7afafc8a AH |
1011 | if (!q->limits.chunk_sectors || |
1012 | req_op(rq) == REQ_OP_DISCARD || | |
1013 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1014 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1015 | |
17007f39 | 1016 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1017 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1018 | } |
1019 | ||
75afb352 JN |
1020 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1021 | { | |
1022 | unsigned int nr_bios = 0; | |
1023 | struct bio *bio; | |
1024 | ||
1025 | __rq_for_each_bio(bio, rq) | |
1026 | nr_bios++; | |
1027 | ||
1028 | return nr_bios; | |
1029 | } | |
1030 | ||
9934c8c0 TH |
1031 | /* |
1032 | * Request issue related functions. | |
1033 | */ | |
1034 | extern struct request *blk_peek_request(struct request_queue *q); | |
1035 | extern void blk_start_request(struct request *rq); | |
1036 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1037 | ||
1da177e4 | 1038 | /* |
2e60e022 TH |
1039 | * Request completion related functions. |
1040 | * | |
1041 | * blk_update_request() completes given number of bytes and updates | |
1042 | * the request without completing it. | |
1043 | * | |
f06d9a2b TH |
1044 | * blk_end_request() and friends. __blk_end_request() must be called |
1045 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1046 | * |
1047 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1048 | * blk_end_request() for parts of the original function. |
1049 | * This prevents code duplication in drivers. | |
1da177e4 | 1050 | */ |
2e60e022 TH |
1051 | extern bool blk_update_request(struct request *rq, int error, |
1052 | unsigned int nr_bytes); | |
12120077 | 1053 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
1054 | extern bool blk_end_request(struct request *rq, int error, |
1055 | unsigned int nr_bytes); | |
1056 | extern void blk_end_request_all(struct request *rq, int error); | |
1057 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1058 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
1059 | extern bool __blk_end_request(struct request *rq, int error, |
1060 | unsigned int nr_bytes); | |
1061 | extern void __blk_end_request_all(struct request *rq, int error); | |
1062 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1063 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 1064 | |
ff856bad | 1065 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1066 | extern void __blk_complete_request(struct request *); |
1067 | extern void blk_abort_request(struct request *); | |
28018c24 | 1068 | extern void blk_unprep_request(struct request *); |
ff856bad | 1069 | |
1da177e4 LT |
1070 | /* |
1071 | * Access functions for manipulating queue properties | |
1072 | */ | |
165125e1 | 1073 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1074 | spinlock_t *lock, int node_id); |
165125e1 | 1075 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
1076 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
1077 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
1078 | extern void blk_cleanup_queue(struct request_queue *); |
1079 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1080 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1081 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1082 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1083 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 1084 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1085 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1086 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1087 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1088 | unsigned int max_write_same_sectors); | |
e1defc4f | 1089 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1090 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1091 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1092 | unsigned int alignment); | |
7c958e32 | 1093 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1094 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1095 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1096 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 1097 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1098 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1099 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1100 | sector_t offset); | |
17be8c24 MP |
1101 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1102 | sector_t offset); | |
c72758f3 MP |
1103 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1104 | sector_t offset); | |
165125e1 | 1105 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1106 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1107 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1108 | extern int blk_queue_dma_drain(struct request_queue *q, |
1109 | dma_drain_needed_fn *dma_drain_needed, | |
1110 | void *buf, unsigned int size); | |
ef9e3fac | 1111 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1112 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1113 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1114 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1115 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1116 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1117 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1118 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1119 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1120 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1121 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1122 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1123 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1124 | |
165125e1 | 1125 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1126 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1127 | extern long nr_blockdev_pages(void); |
1da177e4 | 1128 | |
09ac46c4 | 1129 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1130 | struct request_queue *blk_alloc_queue(gfp_t); |
1131 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1132 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1133 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1134 | |
6c954667 LM |
1135 | /* |
1136 | * block layer runtime pm functions | |
1137 | */ | |
47fafbc7 | 1138 | #ifdef CONFIG_PM |
6c954667 LM |
1139 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1140 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1141 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1142 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1143 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
d07ab6d1 | 1144 | extern void blk_set_runtime_active(struct request_queue *q); |
6c954667 LM |
1145 | #else |
1146 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1147 | struct device *dev) {} | |
1148 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1149 | { | |
1150 | return -ENOSYS; | |
1151 | } | |
1152 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1153 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1154 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
d07ab6d1 | 1155 | extern inline void blk_set_runtime_active(struct request_queue *q) {} |
6c954667 LM |
1156 | #endif |
1157 | ||
316cc67d | 1158 | /* |
75df7136 SJ |
1159 | * blk_plug permits building a queue of related requests by holding the I/O |
1160 | * fragments for a short period. This allows merging of sequential requests | |
1161 | * into single larger request. As the requests are moved from a per-task list to | |
1162 | * the device's request_queue in a batch, this results in improved scalability | |
1163 | * as the lock contention for request_queue lock is reduced. | |
1164 | * | |
1165 | * It is ok not to disable preemption when adding the request to the plug list | |
1166 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1167 | * the plug list when the task sleeps by itself. For details, please see | |
1168 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1169 | */ |
73c10101 | 1170 | struct blk_plug { |
75df7136 | 1171 | struct list_head list; /* requests */ |
320ae51f | 1172 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1173 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1174 | }; |
55c022bb SL |
1175 | #define BLK_MAX_REQUEST_COUNT 16 |
1176 | ||
9cbb1750 | 1177 | struct blk_plug_cb; |
74018dc3 | 1178 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1179 | struct blk_plug_cb { |
1180 | struct list_head list; | |
9cbb1750 N |
1181 | blk_plug_cb_fn callback; |
1182 | void *data; | |
048c9374 | 1183 | }; |
9cbb1750 N |
1184 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1185 | void *data, int size); | |
73c10101 JA |
1186 | extern void blk_start_plug(struct blk_plug *); |
1187 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1188 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1189 | |
1190 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1191 | { | |
1192 | struct blk_plug *plug = tsk->plug; | |
1193 | ||
a237c1c5 JA |
1194 | if (plug) |
1195 | blk_flush_plug_list(plug, false); | |
1196 | } | |
1197 | ||
1198 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1199 | { | |
1200 | struct blk_plug *plug = tsk->plug; | |
1201 | ||
88b996cd | 1202 | if (plug) |
f6603783 | 1203 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1204 | } |
1205 | ||
1206 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1207 | { | |
1208 | struct blk_plug *plug = tsk->plug; | |
1209 | ||
320ae51f JA |
1210 | return plug && |
1211 | (!list_empty(&plug->list) || | |
1212 | !list_empty(&plug->mq_list) || | |
1213 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1214 | } |
1215 | ||
1da177e4 LT |
1216 | /* |
1217 | * tag stuff | |
1218 | */ | |
165125e1 JA |
1219 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1220 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1221 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1222 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1223 | extern void blk_queue_free_tags(struct request_queue *); |
1224 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1225 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1226 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1227 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1228 | |
f583f492 DS |
1229 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1230 | int tag) | |
1231 | { | |
1232 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1233 | return NULL; | |
1234 | return bqt->tag_index[tag]; | |
1235 | } | |
dd3932ed | 1236 | |
e950fdf7 CH |
1237 | |
1238 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
1239 | #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */ | |
dd3932ed CH |
1240 | |
1241 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1242 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1243 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1244 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1245 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1246 | struct bio **biop); |
4363ac7c MP |
1247 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1248 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1249 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1250 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1251 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1252 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1253 | { |
2cf6d26a CH |
1254 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1255 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1256 | gfp_mask, flags); | |
fb2dce86 | 1257 | } |
e6fa0be6 | 1258 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1259 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1260 | { |
1261 | return blkdev_issue_zeroout(sb->s_bdev, | |
1262 | block << (sb->s_blocksize_bits - 9), | |
1263 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1264 | gfp_mask, true); |
e6fa0be6 | 1265 | } |
1da177e4 | 1266 | |
018e0446 | 1267 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1268 | |
eb28d31b MP |
1269 | enum blk_default_limits { |
1270 | BLK_MAX_SEGMENTS = 128, | |
1271 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1272 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1273 | BLK_MAX_SEGMENT_SIZE = 65536, |
1274 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1275 | }; | |
0e435ac2 | 1276 | |
1da177e4 LT |
1277 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1278 | ||
ae03bf63 MP |
1279 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1280 | { | |
025146e1 | 1281 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1282 | } |
1283 | ||
1284 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1285 | { | |
025146e1 | 1286 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1287 | } |
1288 | ||
03100aad KB |
1289 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1290 | { | |
1291 | return q->limits.virt_boundary_mask; | |
1292 | } | |
1293 | ||
ae03bf63 MP |
1294 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1295 | { | |
025146e1 | 1296 | return q->limits.max_sectors; |
ae03bf63 MP |
1297 | } |
1298 | ||
1299 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1300 | { | |
025146e1 | 1301 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1302 | } |
1303 | ||
8a78362c | 1304 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1305 | { |
8a78362c | 1306 | return q->limits.max_segments; |
ae03bf63 MP |
1307 | } |
1308 | ||
1309 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1310 | { | |
025146e1 | 1311 | return q->limits.max_segment_size; |
ae03bf63 MP |
1312 | } |
1313 | ||
e1defc4f | 1314 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1315 | { |
1316 | int retval = 512; | |
1317 | ||
025146e1 MP |
1318 | if (q && q->limits.logical_block_size) |
1319 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1320 | |
1321 | return retval; | |
1322 | } | |
1323 | ||
e1defc4f | 1324 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1325 | { |
e1defc4f | 1326 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1327 | } |
1328 | ||
c72758f3 MP |
1329 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1330 | { | |
1331 | return q->limits.physical_block_size; | |
1332 | } | |
1333 | ||
892b6f90 | 1334 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1335 | { |
1336 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1337 | } | |
1338 | ||
c72758f3 MP |
1339 | static inline unsigned int queue_io_min(struct request_queue *q) |
1340 | { | |
1341 | return q->limits.io_min; | |
1342 | } | |
1343 | ||
ac481c20 MP |
1344 | static inline int bdev_io_min(struct block_device *bdev) |
1345 | { | |
1346 | return queue_io_min(bdev_get_queue(bdev)); | |
1347 | } | |
1348 | ||
c72758f3 MP |
1349 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1350 | { | |
1351 | return q->limits.io_opt; | |
1352 | } | |
1353 | ||
ac481c20 MP |
1354 | static inline int bdev_io_opt(struct block_device *bdev) |
1355 | { | |
1356 | return queue_io_opt(bdev_get_queue(bdev)); | |
1357 | } | |
1358 | ||
c72758f3 MP |
1359 | static inline int queue_alignment_offset(struct request_queue *q) |
1360 | { | |
ac481c20 | 1361 | if (q->limits.misaligned) |
c72758f3 MP |
1362 | return -1; |
1363 | ||
ac481c20 | 1364 | return q->limits.alignment_offset; |
c72758f3 MP |
1365 | } |
1366 | ||
e03a72e1 | 1367 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1368 | { |
1369 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1370 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1371 | |
b8839b8c | 1372 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1373 | } |
1374 | ||
ac481c20 MP |
1375 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1376 | { | |
1377 | struct request_queue *q = bdev_get_queue(bdev); | |
1378 | ||
1379 | if (q->limits.misaligned) | |
1380 | return -1; | |
1381 | ||
1382 | if (bdev != bdev->bd_contains) | |
1383 | return bdev->bd_part->alignment_offset; | |
1384 | ||
1385 | return q->limits.alignment_offset; | |
1386 | } | |
1387 | ||
86b37281 MP |
1388 | static inline int queue_discard_alignment(struct request_queue *q) |
1389 | { | |
1390 | if (q->limits.discard_misaligned) | |
1391 | return -1; | |
1392 | ||
1393 | return q->limits.discard_alignment; | |
1394 | } | |
1395 | ||
e03a72e1 | 1396 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1397 | { |
59771079 | 1398 | unsigned int alignment, granularity, offset; |
dd3d145d | 1399 | |
a934a00a MP |
1400 | if (!lim->max_discard_sectors) |
1401 | return 0; | |
1402 | ||
59771079 LT |
1403 | /* Why are these in bytes, not sectors? */ |
1404 | alignment = lim->discard_alignment >> 9; | |
1405 | granularity = lim->discard_granularity >> 9; | |
1406 | if (!granularity) | |
1407 | return 0; | |
1408 | ||
1409 | /* Offset of the partition start in 'granularity' sectors */ | |
1410 | offset = sector_div(sector, granularity); | |
1411 | ||
1412 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1413 | offset = (granularity + alignment - offset) % granularity; | |
1414 | ||
1415 | /* Turn it back into bytes, gaah */ | |
1416 | return offset << 9; | |
86b37281 MP |
1417 | } |
1418 | ||
c6e66634 PB |
1419 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1420 | { | |
1421 | struct request_queue *q = bdev_get_queue(bdev); | |
1422 | ||
1423 | if (bdev != bdev->bd_contains) | |
1424 | return bdev->bd_part->discard_alignment; | |
1425 | ||
1426 | return q->limits.discard_alignment; | |
1427 | } | |
1428 | ||
98262f27 MP |
1429 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1430 | { | |
a934a00a | 1431 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1432 | return 1; |
1433 | ||
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1438 | { | |
1439 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1440 | } | |
1441 | ||
4363ac7c MP |
1442 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1443 | { | |
1444 | struct request_queue *q = bdev_get_queue(bdev); | |
1445 | ||
1446 | if (q) | |
1447 | return q->limits.max_write_same_sectors; | |
1448 | ||
1449 | return 0; | |
1450 | } | |
1451 | ||
797476b8 DLM |
1452 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1453 | { | |
1454 | struct request_queue *q = bdev_get_queue(bdev); | |
1455 | ||
1456 | if (q) | |
1457 | return blk_queue_zoned_model(q); | |
1458 | ||
1459 | return BLK_ZONED_NONE; | |
1460 | } | |
1461 | ||
1462 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1463 | { | |
1464 | struct request_queue *q = bdev_get_queue(bdev); | |
1465 | ||
1466 | if (q) | |
1467 | return blk_queue_is_zoned(q); | |
1468 | ||
1469 | return false; | |
1470 | } | |
1471 | ||
6a0cb1bc HR |
1472 | static inline unsigned int bdev_zone_size(struct block_device *bdev) |
1473 | { | |
1474 | struct request_queue *q = bdev_get_queue(bdev); | |
1475 | ||
1476 | if (q) | |
1477 | return blk_queue_zone_size(q); | |
1478 | ||
1479 | return 0; | |
1480 | } | |
1481 | ||
165125e1 | 1482 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1483 | { |
482eb689 | 1484 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1485 | } |
1486 | ||
14417799 | 1487 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1488 | unsigned int len) |
1489 | { | |
1490 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1491 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1492 | } |
1493 | ||
1da177e4 LT |
1494 | /* assumes size > 256 */ |
1495 | static inline unsigned int blksize_bits(unsigned int size) | |
1496 | { | |
1497 | unsigned int bits = 8; | |
1498 | do { | |
1499 | bits++; | |
1500 | size >>= 1; | |
1501 | } while (size > 256); | |
1502 | return bits; | |
1503 | } | |
1504 | ||
2befb9e3 | 1505 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1506 | { |
1507 | return bdev->bd_block_size; | |
1508 | } | |
1509 | ||
f3876930 | 1510 | static inline bool queue_flush_queueable(struct request_queue *q) |
1511 | { | |
c888a8f9 | 1512 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1513 | } |
1514 | ||
1da177e4 LT |
1515 | typedef struct {struct page *v;} Sector; |
1516 | ||
1517 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1518 | ||
1519 | static inline void put_dev_sector(Sector p) | |
1520 | { | |
09cbfeaf | 1521 | put_page(p.v); |
1da177e4 LT |
1522 | } |
1523 | ||
e0af2917 ML |
1524 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
1525 | struct bio_vec *bprv, unsigned int offset) | |
1526 | { | |
1527 | return offset || | |
1528 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); | |
1529 | } | |
1530 | ||
03100aad KB |
1531 | /* |
1532 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
1533 | * the SG list. Most drivers don't care about this, but some do. | |
1534 | */ | |
1535 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
1536 | struct bio_vec *bprv, unsigned int offset) | |
1537 | { | |
1538 | if (!queue_virt_boundary(q)) | |
1539 | return false; | |
e0af2917 | 1540 | return __bvec_gap_to_prev(q, bprv, offset); |
03100aad KB |
1541 | } |
1542 | ||
5e7c4274 JA |
1543 | static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, |
1544 | struct bio *next) | |
1545 | { | |
25e71a99 ML |
1546 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
1547 | struct bio_vec pb, nb; | |
1548 | ||
1549 | bio_get_last_bvec(prev, &pb); | |
1550 | bio_get_first_bvec(next, &nb); | |
5e7c4274 | 1551 | |
25e71a99 ML |
1552 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); |
1553 | } | |
1554 | ||
1555 | return false; | |
5e7c4274 JA |
1556 | } |
1557 | ||
1558 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) | |
1559 | { | |
1560 | return bio_will_gap(req->q, req->biotail, bio); | |
1561 | } | |
1562 | ||
1563 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) | |
1564 | { | |
1565 | return bio_will_gap(req->q, bio, req->bio); | |
1566 | } | |
1567 | ||
59c3d45e | 1568 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1569 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
59c3d45e | 1570 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
8ab14595 | 1571 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1572 | |
9195291e | 1573 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1574 | /* |
1575 | * This should not be using sched_clock(). A real patch is in progress | |
1576 | * to fix this up, until that is in place we need to disable preemption | |
1577 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1578 | */ | |
9195291e DS |
1579 | static inline void set_start_time_ns(struct request *req) |
1580 | { | |
28f4197e | 1581 | preempt_disable(); |
9195291e | 1582 | req->start_time_ns = sched_clock(); |
28f4197e | 1583 | preempt_enable(); |
9195291e DS |
1584 | } |
1585 | ||
1586 | static inline void set_io_start_time_ns(struct request *req) | |
1587 | { | |
28f4197e | 1588 | preempt_disable(); |
9195291e | 1589 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1590 | preempt_enable(); |
9195291e | 1591 | } |
84c124da DS |
1592 | |
1593 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1594 | { | |
1595 | return req->start_time_ns; | |
1596 | } | |
1597 | ||
1598 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1599 | { | |
1600 | return req->io_start_time_ns; | |
1601 | } | |
9195291e DS |
1602 | #else |
1603 | static inline void set_start_time_ns(struct request *req) {} | |
1604 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1605 | static inline uint64_t rq_start_time_ns(struct request *req) |
1606 | { | |
1607 | return 0; | |
1608 | } | |
1609 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1610 | { | |
1611 | return 0; | |
1612 | } | |
9195291e DS |
1613 | #endif |
1614 | ||
1da177e4 LT |
1615 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1616 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1617 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1618 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1619 | ||
7ba1ba12 MP |
1620 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1621 | ||
8288f496 MP |
1622 | enum blk_integrity_flags { |
1623 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1624 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1625 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1626 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1627 | }; |
7ba1ba12 | 1628 | |
18593088 | 1629 | struct blk_integrity_iter { |
7ba1ba12 MP |
1630 | void *prot_buf; |
1631 | void *data_buf; | |
3be91c4a | 1632 | sector_t seed; |
7ba1ba12 | 1633 | unsigned int data_size; |
3be91c4a | 1634 | unsigned short interval; |
7ba1ba12 MP |
1635 | const char *disk_name; |
1636 | }; | |
1637 | ||
18593088 | 1638 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1639 | |
0f8087ec MP |
1640 | struct blk_integrity_profile { |
1641 | integrity_processing_fn *generate_fn; | |
1642 | integrity_processing_fn *verify_fn; | |
1643 | const char *name; | |
1644 | }; | |
7ba1ba12 | 1645 | |
25520d55 | 1646 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1647 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1648 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1649 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1650 | struct scatterlist *); | |
1651 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1652 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1653 | struct request *); | |
1654 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1655 | struct bio *); | |
7ba1ba12 | 1656 | |
25520d55 | 1657 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1658 | { |
ac6fc48c | 1659 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1660 | |
1661 | if (!bi->profile) | |
1662 | return NULL; | |
1663 | ||
1664 | return bi; | |
b04accc4 JA |
1665 | } |
1666 | ||
25520d55 MP |
1667 | static inline |
1668 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1669 | { |
25520d55 | 1670 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1671 | } |
1672 | ||
180b2f95 | 1673 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1674 | { |
180b2f95 | 1675 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1676 | } |
1677 | ||
13f05c8d MP |
1678 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1679 | unsigned int segs) | |
1680 | { | |
1681 | q->limits.max_integrity_segments = segs; | |
1682 | } | |
1683 | ||
1684 | static inline unsigned short | |
1685 | queue_max_integrity_segments(struct request_queue *q) | |
1686 | { | |
1687 | return q->limits.max_integrity_segments; | |
1688 | } | |
1689 | ||
7f39add3 SG |
1690 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1691 | struct bio *next) | |
1692 | { | |
1693 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
1694 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
1695 | ||
1696 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1697 | bip_next->bip_vec[0].bv_offset); | |
1698 | } | |
1699 | ||
1700 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1701 | struct bio *bio) | |
1702 | { | |
1703 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1704 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
1705 | ||
1706 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1707 | bip_next->bip_vec[0].bv_offset); | |
1708 | } | |
1709 | ||
7ba1ba12 MP |
1710 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1711 | ||
fd83240a SR |
1712 | struct bio; |
1713 | struct block_device; | |
1714 | struct gendisk; | |
1715 | struct blk_integrity; | |
1716 | ||
1717 | static inline int blk_integrity_rq(struct request *rq) | |
1718 | { | |
1719 | return 0; | |
1720 | } | |
1721 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1722 | struct bio *b) | |
1723 | { | |
1724 | return 0; | |
1725 | } | |
1726 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1727 | struct bio *b, | |
1728 | struct scatterlist *s) | |
1729 | { | |
1730 | return 0; | |
1731 | } | |
1732 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1733 | { | |
61a04e5b | 1734 | return NULL; |
fd83240a SR |
1735 | } |
1736 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1737 | { | |
1738 | return NULL; | |
1739 | } | |
1740 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1741 | { | |
1742 | return 0; | |
1743 | } | |
25520d55 | 1744 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1745 | struct blk_integrity *b) |
1746 | { | |
fd83240a SR |
1747 | } |
1748 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1749 | { | |
1750 | } | |
1751 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1752 | unsigned int segs) | |
1753 | { | |
1754 | } | |
1755 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1756 | { | |
1757 | return 0; | |
1758 | } | |
4eaf99be MP |
1759 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1760 | struct request *r1, | |
1761 | struct request *r2) | |
fd83240a | 1762 | { |
cb1a5ab6 | 1763 | return true; |
fd83240a | 1764 | } |
4eaf99be MP |
1765 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1766 | struct request *r, | |
1767 | struct bio *b) | |
fd83240a | 1768 | { |
cb1a5ab6 | 1769 | return true; |
fd83240a | 1770 | } |
25520d55 | 1771 | |
7f39add3 SG |
1772 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1773 | struct bio *next) | |
1774 | { | |
1775 | return false; | |
1776 | } | |
1777 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1778 | struct bio *bio) | |
1779 | { | |
1780 | return false; | |
1781 | } | |
7ba1ba12 MP |
1782 | |
1783 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1784 | ||
b2e0d162 DW |
1785 | /** |
1786 | * struct blk_dax_ctl - control and output parameters for ->direct_access | |
1787 | * @sector: (input) offset relative to a block_device | |
1788 | * @addr: (output) kernel virtual address for @sector populated by driver | |
1789 | * @pfn: (output) page frame number for @addr populated by driver | |
1790 | * @size: (input) number of bytes requested | |
1791 | */ | |
1792 | struct blk_dax_ctl { | |
1793 | sector_t sector; | |
7a9eb206 | 1794 | void *addr; |
b2e0d162 | 1795 | long size; |
34c0fd54 | 1796 | pfn_t pfn; |
b2e0d162 DW |
1797 | }; |
1798 | ||
08f85851 | 1799 | struct block_device_operations { |
d4430d62 | 1800 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1801 | void (*release) (struct gendisk *, fmode_t); |
c11f0c0b | 1802 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
d4430d62 AV |
1803 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1804 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
7a9eb206 DW |
1805 | long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, |
1806 | long); | |
77ea887e TH |
1807 | unsigned int (*check_events) (struct gendisk *disk, |
1808 | unsigned int clearing); | |
1809 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1810 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1811 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1812 | int (*revalidate_disk) (struct gendisk *); |
1813 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1814 | /* this callback is with swap_lock and sometimes page table lock held */ |
1815 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 | 1816 | struct module *owner; |
bbd3e064 | 1817 | const struct pr_ops *pr_ops; |
08f85851 AV |
1818 | }; |
1819 | ||
633a08b8 AV |
1820 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1821 | unsigned long); | |
47a191fd MW |
1822 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1823 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1824 | struct writeback_control *); | |
b2e0d162 | 1825 | extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); |
2d96afc8 | 1826 | extern int bdev_dax_supported(struct super_block *, int); |
a8078b1f | 1827 | extern bool bdev_dax_capable(struct block_device *); |
9361401e | 1828 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1829 | |
1830 | struct block_device; | |
1831 | ||
9361401e DH |
1832 | /* |
1833 | * stubs for when the block layer is configured out | |
1834 | */ | |
1835 | #define buffer_heads_over_limit 0 | |
1836 | ||
9361401e DH |
1837 | static inline long nr_blockdev_pages(void) |
1838 | { | |
1839 | return 0; | |
1840 | } | |
1841 | ||
1f940bdf JA |
1842 | struct blk_plug { |
1843 | }; | |
1844 | ||
1845 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1846 | { |
1847 | } | |
1848 | ||
1f940bdf | 1849 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1850 | { |
1851 | } | |
1852 | ||
1f940bdf | 1853 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1854 | { |
1855 | } | |
1856 | ||
a237c1c5 JA |
1857 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1858 | { | |
1859 | } | |
1860 | ||
1861 | ||
73c10101 JA |
1862 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1863 | { | |
1864 | return false; | |
1865 | } | |
1866 | ||
ac13a829 FF |
1867 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1868 | sector_t *error_sector) | |
1869 | { | |
1870 | return 0; | |
1871 | } | |
1872 | ||
9361401e DH |
1873 | #endif /* CONFIG_BLOCK */ |
1874 | ||
1da177e4 | 1875 | #endif |