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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; |
ca93e453 | 145 | u64 cmd_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 | ||
4e1b2d52 MC |
247 | #define REQ_OP_SHIFT (8 * sizeof(u64) - REQ_OP_BITS) |
248 | #define req_op(req) ((req)->cmd_flags >> REQ_OP_SHIFT) | |
249 | ||
250 | #define req_set_op(req, op) do { \ | |
251 | WARN_ON(op >= (1 << REQ_OP_BITS)); \ | |
252 | (req)->cmd_flags &= ((1ULL << REQ_OP_SHIFT) - 1); \ | |
253 | (req)->cmd_flags |= ((u64) (op) << REQ_OP_SHIFT); \ | |
254 | } while (0) | |
255 | ||
f2150821 MC |
256 | #define req_set_op_attrs(req, op, flags) do { \ |
257 | req_set_op(req, op); \ | |
258 | (req)->cmd_flags |= flags; \ | |
259 | } while (0) | |
260 | ||
766ca442 FLVC |
261 | static inline unsigned short req_get_ioprio(struct request *req) |
262 | { | |
263 | return req->ioprio; | |
264 | } | |
265 | ||
1da177e4 LT |
266 | #include <linux/elevator.h> |
267 | ||
320ae51f JA |
268 | struct blk_queue_ctx; |
269 | ||
165125e1 | 270 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 271 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 272 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 273 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
274 | |
275 | struct bio_vec; | |
ff856bad | 276 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 277 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 278 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 279 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 280 | |
242f9dcb JA |
281 | enum blk_eh_timer_return { |
282 | BLK_EH_NOT_HANDLED, | |
283 | BLK_EH_HANDLED, | |
284 | BLK_EH_RESET_TIMER, | |
285 | }; | |
286 | ||
287 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
288 | ||
1da177e4 LT |
289 | enum blk_queue_state { |
290 | Queue_down, | |
291 | Queue_up, | |
292 | }; | |
293 | ||
1da177e4 LT |
294 | struct blk_queue_tag { |
295 | struct request **tag_index; /* map of busy tags */ | |
296 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
297 | int busy; /* current depth */ |
298 | int max_depth; /* what we will send to device */ | |
ba025082 | 299 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 300 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
301 | int alloc_policy; /* tag allocation policy */ |
302 | int next_tag; /* next tag */ | |
1da177e4 | 303 | }; |
ee1b6f7a SL |
304 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
305 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 306 | |
abf54393 FT |
307 | #define BLK_SCSI_MAX_CMDS (256) |
308 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
309 | ||
797476b8 DLM |
310 | /* |
311 | * Zoned block device models (zoned limit). | |
312 | */ | |
313 | enum blk_zoned_model { | |
314 | BLK_ZONED_NONE, /* Regular block device */ | |
315 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
316 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
317 | }; | |
318 | ||
025146e1 MP |
319 | struct queue_limits { |
320 | unsigned long bounce_pfn; | |
321 | unsigned long seg_boundary_mask; | |
03100aad | 322 | unsigned long virt_boundary_mask; |
025146e1 MP |
323 | |
324 | unsigned int max_hw_sectors; | |
ca369d51 | 325 | unsigned int max_dev_sectors; |
762380ad | 326 | unsigned int chunk_sectors; |
025146e1 MP |
327 | unsigned int max_sectors; |
328 | unsigned int max_segment_size; | |
c72758f3 MP |
329 | unsigned int physical_block_size; |
330 | unsigned int alignment_offset; | |
331 | unsigned int io_min; | |
332 | unsigned int io_opt; | |
67efc925 | 333 | unsigned int max_discard_sectors; |
0034af03 | 334 | unsigned int max_hw_discard_sectors; |
4363ac7c | 335 | unsigned int max_write_same_sectors; |
86b37281 MP |
336 | unsigned int discard_granularity; |
337 | unsigned int discard_alignment; | |
025146e1 MP |
338 | |
339 | unsigned short logical_block_size; | |
8a78362c | 340 | unsigned short max_segments; |
13f05c8d | 341 | unsigned short max_integrity_segments; |
025146e1 | 342 | |
c72758f3 | 343 | unsigned char misaligned; |
86b37281 | 344 | unsigned char discard_misaligned; |
e692cb66 | 345 | unsigned char cluster; |
a934a00a | 346 | unsigned char discard_zeroes_data; |
c78afc62 | 347 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 348 | enum blk_zoned_model zoned; |
025146e1 MP |
349 | }; |
350 | ||
6a0cb1bc HR |
351 | #ifdef CONFIG_BLK_DEV_ZONED |
352 | ||
353 | struct blk_zone_report_hdr { | |
354 | unsigned int nr_zones; | |
355 | u8 padding[60]; | |
356 | }; | |
357 | ||
358 | extern int blkdev_report_zones(struct block_device *bdev, | |
359 | sector_t sector, struct blk_zone *zones, | |
360 | unsigned int *nr_zones, gfp_t gfp_mask); | |
361 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
362 | sector_t nr_sectors, gfp_t gfp_mask); | |
363 | ||
3ed05a98 ST |
364 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
365 | unsigned int cmd, unsigned long arg); | |
366 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
367 | unsigned int cmd, unsigned long arg); | |
368 | ||
369 | #else /* CONFIG_BLK_DEV_ZONED */ | |
370 | ||
371 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, | |
372 | fmode_t mode, unsigned int cmd, | |
373 | unsigned long arg) | |
374 | { | |
375 | return -ENOTTY; | |
376 | } | |
377 | ||
378 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
379 | fmode_t mode, unsigned int cmd, | |
380 | unsigned long arg) | |
381 | { | |
382 | return -ENOTTY; | |
383 | } | |
384 | ||
6a0cb1bc HR |
385 | #endif /* CONFIG_BLK_DEV_ZONED */ |
386 | ||
d7b76301 | 387 | struct request_queue { |
1da177e4 LT |
388 | /* |
389 | * Together with queue_head for cacheline sharing | |
390 | */ | |
391 | struct list_head queue_head; | |
392 | struct request *last_merge; | |
b374d18a | 393 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
394 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
395 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
396 | |
397 | /* | |
a051661c TH |
398 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
399 | * is used, root blkg allocates from @q->root_rl and all other | |
400 | * blkgs from their own blkg->rl. Which one to use should be | |
401 | * determined using bio_request_list(). | |
1da177e4 | 402 | */ |
a051661c | 403 | struct request_list root_rl; |
1da177e4 LT |
404 | |
405 | request_fn_proc *request_fn; | |
1da177e4 LT |
406 | make_request_fn *make_request_fn; |
407 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 408 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 409 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 410 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 411 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 412 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 413 | |
320ae51f JA |
414 | struct blk_mq_ops *mq_ops; |
415 | ||
416 | unsigned int *mq_map; | |
417 | ||
418 | /* sw queues */ | |
e6cdb092 | 419 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
420 | unsigned int nr_queues; |
421 | ||
422 | /* hw dispatch queues */ | |
423 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
424 | unsigned int nr_hw_queues; | |
425 | ||
8922e16c TH |
426 | /* |
427 | * Dispatch queue sorting | |
428 | */ | |
1b47f531 | 429 | sector_t end_sector; |
8922e16c | 430 | struct request *boundary_rq; |
8922e16c | 431 | |
1da177e4 | 432 | /* |
3cca6dc1 | 433 | * Delayed queue handling |
1da177e4 | 434 | */ |
3cca6dc1 | 435 | struct delayed_work delay_work; |
1da177e4 LT |
436 | |
437 | struct backing_dev_info backing_dev_info; | |
438 | ||
439 | /* | |
440 | * The queue owner gets to use this for whatever they like. | |
441 | * ll_rw_blk doesn't touch it. | |
442 | */ | |
443 | void *queuedata; | |
444 | ||
1da177e4 | 445 | /* |
d7b76301 | 446 | * various queue flags, see QUEUE_* below |
1da177e4 | 447 | */ |
d7b76301 | 448 | unsigned long queue_flags; |
1da177e4 | 449 | |
a73f730d TH |
450 | /* |
451 | * ida allocated id for this queue. Used to index queues from | |
452 | * ioctx. | |
453 | */ | |
454 | int id; | |
455 | ||
1da177e4 | 456 | /* |
d7b76301 | 457 | * queue needs bounce pages for pages above this limit |
1da177e4 | 458 | */ |
d7b76301 | 459 | gfp_t bounce_gfp; |
1da177e4 LT |
460 | |
461 | /* | |
152587de | 462 | * protects queue structures from reentrancy. ->__queue_lock should |
463 | * _never_ be used directly, it is queue private. always use | |
464 | * ->queue_lock. | |
1da177e4 | 465 | */ |
152587de | 466 | spinlock_t __queue_lock; |
1da177e4 LT |
467 | spinlock_t *queue_lock; |
468 | ||
469 | /* | |
470 | * queue kobject | |
471 | */ | |
472 | struct kobject kobj; | |
473 | ||
320ae51f JA |
474 | /* |
475 | * mq queue kobject | |
476 | */ | |
477 | struct kobject mq_kobj; | |
478 | ||
ac6fc48c DW |
479 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
480 | struct blk_integrity integrity; | |
481 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
482 | ||
47fafbc7 | 483 | #ifdef CONFIG_PM |
6c954667 LM |
484 | struct device *dev; |
485 | int rpm_status; | |
486 | unsigned int nr_pending; | |
487 | #endif | |
488 | ||
1da177e4 LT |
489 | /* |
490 | * queue settings | |
491 | */ | |
492 | unsigned long nr_requests; /* Max # of requests */ | |
493 | unsigned int nr_congestion_on; | |
494 | unsigned int nr_congestion_off; | |
495 | unsigned int nr_batching; | |
496 | ||
fa0ccd83 | 497 | unsigned int dma_drain_size; |
d7b76301 | 498 | void *dma_drain_buffer; |
e3790c7d | 499 | unsigned int dma_pad_mask; |
1da177e4 LT |
500 | unsigned int dma_alignment; |
501 | ||
502 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 503 | struct list_head tag_busy_list; |
1da177e4 | 504 | |
15853af9 | 505 | unsigned int nr_sorted; |
0a7ae2ff | 506 | unsigned int in_flight[2]; |
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 JA |
514 | unsigned int rq_timeout; |
515 | struct timer_list timeout; | |
287922eb | 516 | struct work_struct timeout_work; |
242f9dcb JA |
517 | struct list_head timeout_list; |
518 | ||
a612fddf | 519 | struct list_head icq_list; |
4eef3049 | 520 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 521 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 522 | struct blkcg_gq *root_blkg; |
03aa264a | 523 | struct list_head blkg_list; |
4eef3049 | 524 | #endif |
a612fddf | 525 | |
025146e1 MP |
526 | struct queue_limits limits; |
527 | ||
1da177e4 LT |
528 | /* |
529 | * sg stuff | |
530 | */ | |
531 | unsigned int sg_timeout; | |
532 | unsigned int sg_reserved_size; | |
1946089a | 533 | int node; |
6c5c9341 | 534 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 535 | struct blk_trace *blk_trace; |
6c5c9341 | 536 | #endif |
1da177e4 | 537 | /* |
4913efe4 | 538 | * for flush operations |
1da177e4 | 539 | */ |
7c94e1c1 | 540 | struct blk_flush_queue *fq; |
483f4afc | 541 | |
6fca6a61 CH |
542 | struct list_head requeue_list; |
543 | spinlock_t requeue_lock; | |
2849450a | 544 | struct delayed_work requeue_work; |
6fca6a61 | 545 | |
483f4afc | 546 | struct mutex sysfs_lock; |
d351af01 | 547 | |
d732580b | 548 | int bypass_depth; |
4ecd4fef | 549 | atomic_t mq_freeze_depth; |
d732580b | 550 | |
d351af01 | 551 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
552 | bsg_job_fn *bsg_job_fn; |
553 | int bsg_job_size; | |
d351af01 FT |
554 | struct bsg_class_device bsg_dev; |
555 | #endif | |
e43473b7 VG |
556 | |
557 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
558 | /* Throttle data */ | |
559 | struct throtl_data *td; | |
560 | #endif | |
548bc8e1 | 561 | struct rcu_head rcu_head; |
320ae51f | 562 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 563 | struct percpu_ref q_usage_counter; |
320ae51f | 564 | struct list_head all_q_node; |
0d2602ca JA |
565 | |
566 | struct blk_mq_tag_set *tag_set; | |
567 | struct list_head tag_set_list; | |
54efd50b | 568 | struct bio_set *bio_split; |
4593fdbe AM |
569 | |
570 | bool mq_sysfs_init_done; | |
1da177e4 LT |
571 | }; |
572 | ||
1da177e4 LT |
573 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
574 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
575 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
576 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 577 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 578 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
579 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
580 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 581 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
582 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
583 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
584 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 585 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
586 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
587 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
588 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
589 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
288dab8a | 590 | #define QUEUE_FLAG_SECERASE 17 /* supports secure erase */ |
5757a6d7 | 591 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 592 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
320ae51f | 593 | #define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */ |
05f1dd53 | 594 | #define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/ |
05229bee | 595 | #define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */ |
93e9d8e8 JA |
596 | #define QUEUE_FLAG_WC 23 /* Write back caching */ |
597 | #define QUEUE_FLAG_FUA 24 /* device supports FUA writes */ | |
c888a8f9 | 598 | #define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */ |
163d4baa | 599 | #define QUEUE_FLAG_DAX 26 /* device supports DAX */ |
bc58ba94 JA |
600 | |
601 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 602 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
603 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
604 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 605 | |
94eddfbe | 606 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
ad9cf3bb | 607 | (1 << QUEUE_FLAG_STACKABLE) | \ |
8e0b60b9 CH |
608 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
609 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 610 | |
8bcb6c7d | 611 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 612 | { |
8bcb6c7d AK |
613 | if (q->queue_lock) |
614 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
615 | } |
616 | ||
75ad23bc NP |
617 | static inline void queue_flag_set_unlocked(unsigned int flag, |
618 | struct request_queue *q) | |
619 | { | |
620 | __set_bit(flag, &q->queue_flags); | |
621 | } | |
622 | ||
e48ec690 JA |
623 | static inline int queue_flag_test_and_clear(unsigned int flag, |
624 | struct request_queue *q) | |
625 | { | |
8bcb6c7d | 626 | queue_lockdep_assert_held(q); |
e48ec690 JA |
627 | |
628 | if (test_bit(flag, &q->queue_flags)) { | |
629 | __clear_bit(flag, &q->queue_flags); | |
630 | return 1; | |
631 | } | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static inline int queue_flag_test_and_set(unsigned int flag, | |
637 | struct request_queue *q) | |
638 | { | |
8bcb6c7d | 639 | queue_lockdep_assert_held(q); |
e48ec690 JA |
640 | |
641 | if (!test_bit(flag, &q->queue_flags)) { | |
642 | __set_bit(flag, &q->queue_flags); | |
643 | return 0; | |
644 | } | |
645 | ||
646 | return 1; | |
647 | } | |
648 | ||
75ad23bc NP |
649 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
650 | { | |
8bcb6c7d | 651 | queue_lockdep_assert_held(q); |
75ad23bc NP |
652 | __set_bit(flag, &q->queue_flags); |
653 | } | |
654 | ||
655 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
656 | struct request_queue *q) | |
657 | { | |
658 | __clear_bit(flag, &q->queue_flags); | |
659 | } | |
660 | ||
0a7ae2ff JA |
661 | static inline int queue_in_flight(struct request_queue *q) |
662 | { | |
663 | return q->in_flight[0] + q->in_flight[1]; | |
664 | } | |
665 | ||
75ad23bc NP |
666 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
667 | { | |
8bcb6c7d | 668 | queue_lockdep_assert_held(q); |
75ad23bc NP |
669 | __clear_bit(flag, &q->queue_flags); |
670 | } | |
671 | ||
1da177e4 LT |
672 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
673 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 674 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 675 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 676 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 677 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 678 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
679 | #define blk_queue_noxmerges(q) \ |
680 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 681 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 682 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 683 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
684 | #define blk_queue_stackable(q) \ |
685 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 686 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
687 | #define blk_queue_secure_erase(q) \ |
688 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 689 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
1da177e4 | 690 | |
33659ebb CH |
691 | #define blk_noretry_request(rq) \ |
692 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
693 | REQ_FAILFAST_DRIVER)) | |
694 | ||
695 | #define blk_account_rq(rq) \ | |
e8064021 | 696 | (((rq)->rq_flags & RQF_STARTED) && \ |
e2a60da7 | 697 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 698 | |
ab780f1e | 699 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 700 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
701 | /* rq->queuelist of dequeued request must be list_empty() */ |
702 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
703 | |
704 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
705 | ||
4e1b2d52 | 706 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 707 | |
49fd524f JA |
708 | /* |
709 | * Driver can handle struct request, if it either has an old style | |
710 | * request_fn defined, or is blk-mq based. | |
711 | */ | |
712 | static inline bool queue_is_rq_based(struct request_queue *q) | |
713 | { | |
714 | return q->request_fn || q->mq_ops; | |
715 | } | |
716 | ||
e692cb66 MP |
717 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
718 | { | |
719 | return q->limits.cluster; | |
720 | } | |
721 | ||
797476b8 DLM |
722 | static inline enum blk_zoned_model |
723 | blk_queue_zoned_model(struct request_queue *q) | |
724 | { | |
725 | return q->limits.zoned; | |
726 | } | |
727 | ||
728 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
729 | { | |
730 | switch (blk_queue_zoned_model(q)) { | |
731 | case BLK_ZONED_HA: | |
732 | case BLK_ZONED_HM: | |
733 | return true; | |
734 | default: | |
735 | return false; | |
736 | } | |
737 | } | |
738 | ||
6a0cb1bc HR |
739 | static inline unsigned int blk_queue_zone_size(struct request_queue *q) |
740 | { | |
741 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
742 | } | |
743 | ||
9e2585a8 | 744 | /* |
1faa16d2 | 745 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 746 | */ |
d9d8c5c4 | 747 | static inline bool rw_is_sync(int op, unsigned int rw_flags) |
1faa16d2 | 748 | { |
d9d8c5c4 | 749 | return op == REQ_OP_READ || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
750 | } |
751 | ||
752 | static inline bool rq_is_sync(struct request *rq) | |
753 | { | |
d9d8c5c4 | 754 | return rw_is_sync(req_op(rq), rq->cmd_flags); |
1faa16d2 JA |
755 | } |
756 | ||
5b788ce3 | 757 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 758 | { |
5b788ce3 TH |
759 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
760 | ||
761 | return rl->flags & flag; | |
1da177e4 LT |
762 | } |
763 | ||
5b788ce3 | 764 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 765 | { |
5b788ce3 TH |
766 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
767 | ||
768 | rl->flags |= flag; | |
1da177e4 LT |
769 | } |
770 | ||
5b788ce3 | 771 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 772 | { |
5b788ce3 TH |
773 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
774 | ||
775 | rl->flags &= ~flag; | |
1da177e4 LT |
776 | } |
777 | ||
e2a60da7 MP |
778 | static inline bool rq_mergeable(struct request *rq) |
779 | { | |
780 | if (rq->cmd_type != REQ_TYPE_FS) | |
781 | return false; | |
1da177e4 | 782 | |
3a5e02ce MC |
783 | if (req_op(rq) == REQ_OP_FLUSH) |
784 | return false; | |
785 | ||
e2a60da7 | 786 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
787 | return false; |
788 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
789 | return false; |
790 | ||
791 | return true; | |
792 | } | |
1da177e4 | 793 | |
4363ac7c MP |
794 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
795 | { | |
796 | if (bio_data(a) == bio_data(b)) | |
797 | return true; | |
798 | ||
799 | return false; | |
800 | } | |
801 | ||
1da177e4 LT |
802 | /* |
803 | * q->prep_rq_fn return values | |
804 | */ | |
0fb5b1fb MP |
805 | enum { |
806 | BLKPREP_OK, /* serve it */ | |
807 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
808 | BLKPREP_DEFER, /* leave on queue */ | |
809 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
810 | }; | |
1da177e4 LT |
811 | |
812 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
813 | ||
814 | /* | |
815 | * standard bounce addresses: | |
816 | * | |
817 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
818 | * BLK_BOUNCE_ANY : don't bounce anything | |
819 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
820 | */ | |
2472892a AK |
821 | |
822 | #if BITS_PER_LONG == 32 | |
1da177e4 | 823 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
824 | #else |
825 | #define BLK_BOUNCE_HIGH -1ULL | |
826 | #endif | |
827 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 828 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 829 | |
3d6392cf JA |
830 | /* |
831 | * default timeout for SG_IO if none specified | |
832 | */ | |
833 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 834 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 835 | |
2a7326b5 | 836 | #ifdef CONFIG_BOUNCE |
1da177e4 | 837 | extern int init_emergency_isa_pool(void); |
165125e1 | 838 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
839 | #else |
840 | static inline int init_emergency_isa_pool(void) | |
841 | { | |
842 | return 0; | |
843 | } | |
165125e1 | 844 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
845 | { |
846 | } | |
847 | #endif /* CONFIG_MMU */ | |
848 | ||
152e283f FT |
849 | struct rq_map_data { |
850 | struct page **pages; | |
851 | int page_order; | |
852 | int nr_entries; | |
56c451f4 | 853 | unsigned long offset; |
97ae77a1 | 854 | int null_mapped; |
ecb554a8 | 855 | int from_user; |
152e283f FT |
856 | }; |
857 | ||
5705f702 | 858 | struct req_iterator { |
7988613b | 859 | struct bvec_iter iter; |
5705f702 N |
860 | struct bio *bio; |
861 | }; | |
862 | ||
863 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
864 | #define for_each_bio(_bio) \ |
865 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 866 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
867 | if ((rq->bio)) \ |
868 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
869 | ||
5705f702 N |
870 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
871 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 872 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 873 | |
4550dd6c | 874 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 875 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 876 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 877 | |
2d4dc890 IL |
878 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
879 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
880 | #endif | |
881 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
882 | extern void rq_flush_dcache_pages(struct request *rq); | |
883 | #else | |
884 | static inline void rq_flush_dcache_pages(struct request *rq) | |
885 | { | |
886 | } | |
887 | #endif | |
888 | ||
2af3a815 TK |
889 | #ifdef CONFIG_PRINTK |
890 | #define vfs_msg(sb, level, fmt, ...) \ | |
891 | __vfs_msg(sb, level, fmt, ##__VA_ARGS__) | |
892 | #else | |
893 | #define vfs_msg(sb, level, fmt, ...) \ | |
894 | do { \ | |
895 | no_printk(fmt, ##__VA_ARGS__); \ | |
896 | __vfs_msg(sb, "", " "); \ | |
897 | } while (0) | |
898 | #endif | |
899 | ||
1da177e4 LT |
900 | extern int blk_register_queue(struct gendisk *disk); |
901 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 902 | extern blk_qc_t generic_make_request(struct bio *bio); |
2a4aa30c | 903 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 904 | extern void blk_put_request(struct request *); |
165125e1 | 905 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 906 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
f27b087b | 907 | extern void blk_rq_set_block_pc(struct request *); |
165125e1 | 908 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 | 909 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
37e58237 | 910 | int offset, unsigned int len); |
ef9e3fac | 911 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
912 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
913 | struct bio_set *bs, gfp_t gfp_mask, | |
914 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
915 | void *data); | |
916 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
917 | extern int blk_insert_cloned_request(struct request_queue *q, |
918 | struct request *rq); | |
98d61d5b | 919 | extern int blk_rq_append_bio(struct request *rq, struct bio *bio); |
3cca6dc1 | 920 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
54efd50b KO |
921 | extern void blk_queue_split(struct request_queue *, struct bio **, |
922 | struct bio_set *); | |
165125e1 | 923 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 924 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
925 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
926 | unsigned int, void __user *); | |
74f3c8af AV |
927 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
928 | unsigned int, void __user *); | |
e915e872 AV |
929 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
930 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 931 | |
6f3b0e8b | 932 | extern int blk_queue_enter(struct request_queue *q, bool nowait); |
2e6edc95 | 933 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 934 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 935 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 936 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 937 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 938 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 939 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 940 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 941 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 942 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 943 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
944 | struct rq_map_data *, void __user *, unsigned long, |
945 | gfp_t); | |
8e5cfc45 | 946 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
947 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
948 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
949 | struct rq_map_data *, const struct iov_iter *, |
950 | gfp_t); | |
165125e1 | 951 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 952 | struct request *, int); |
165125e1 | 953 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 954 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 955 | |
05229bee JA |
956 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
957 | ||
165125e1 | 958 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 959 | { |
ff9ea323 | 960 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
961 | } |
962 | ||
5efccd17 | 963 | /* |
80a761fd TH |
964 | * blk_rq_pos() : the current sector |
965 | * blk_rq_bytes() : bytes left in the entire request | |
966 | * blk_rq_cur_bytes() : bytes left in the current segment | |
967 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
968 | * blk_rq_sectors() : sectors left in the entire request | |
969 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 970 | */ |
5b93629b TH |
971 | static inline sector_t blk_rq_pos(const struct request *rq) |
972 | { | |
a2dec7b3 | 973 | return rq->__sector; |
2e46e8b2 TH |
974 | } |
975 | ||
976 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
977 | { | |
a2dec7b3 | 978 | return rq->__data_len; |
5b93629b TH |
979 | } |
980 | ||
2e46e8b2 TH |
981 | static inline int blk_rq_cur_bytes(const struct request *rq) |
982 | { | |
983 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
984 | } | |
5efccd17 | 985 | |
80a761fd TH |
986 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
987 | ||
5b93629b TH |
988 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
989 | { | |
2e46e8b2 | 990 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
991 | } |
992 | ||
993 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
994 | { | |
2e46e8b2 | 995 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
996 | } |
997 | ||
f31dc1cd | 998 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 999 | int op) |
f31dc1cd | 1000 | { |
7afafc8a | 1001 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
871dd928 | 1002 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 1003 | |
8fe0d473 | 1004 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1005 | return q->limits.max_write_same_sectors; |
1006 | ||
f31dc1cd MP |
1007 | return q->limits.max_sectors; |
1008 | } | |
1009 | ||
762380ad JA |
1010 | /* |
1011 | * Return maximum size of a request at given offset. Only valid for | |
1012 | * file system requests. | |
1013 | */ | |
1014 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1015 | sector_t offset) | |
1016 | { | |
1017 | if (!q->limits.chunk_sectors) | |
736ed4de | 1018 | return q->limits.max_sectors; |
762380ad JA |
1019 | |
1020 | return q->limits.chunk_sectors - | |
1021 | (offset & (q->limits.chunk_sectors - 1)); | |
1022 | } | |
1023 | ||
17007f39 DLM |
1024 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1025 | sector_t offset) | |
f31dc1cd MP |
1026 | { |
1027 | struct request_queue *q = rq->q; | |
1028 | ||
f2101842 | 1029 | if (unlikely(rq->cmd_type != REQ_TYPE_FS)) |
f31dc1cd MP |
1030 | return q->limits.max_hw_sectors; |
1031 | ||
7afafc8a AH |
1032 | if (!q->limits.chunk_sectors || |
1033 | req_op(rq) == REQ_OP_DISCARD || | |
1034 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1035 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1036 | |
17007f39 | 1037 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1038 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1039 | } |
1040 | ||
75afb352 JN |
1041 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1042 | { | |
1043 | unsigned int nr_bios = 0; | |
1044 | struct bio *bio; | |
1045 | ||
1046 | __rq_for_each_bio(bio, rq) | |
1047 | nr_bios++; | |
1048 | ||
1049 | return nr_bios; | |
1050 | } | |
1051 | ||
9934c8c0 TH |
1052 | /* |
1053 | * Request issue related functions. | |
1054 | */ | |
1055 | extern struct request *blk_peek_request(struct request_queue *q); | |
1056 | extern void blk_start_request(struct request *rq); | |
1057 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1058 | ||
1da177e4 | 1059 | /* |
2e60e022 TH |
1060 | * Request completion related functions. |
1061 | * | |
1062 | * blk_update_request() completes given number of bytes and updates | |
1063 | * the request without completing it. | |
1064 | * | |
f06d9a2b TH |
1065 | * blk_end_request() and friends. __blk_end_request() must be called |
1066 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1067 | * |
1068 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1069 | * blk_end_request() for parts of the original function. |
1070 | * This prevents code duplication in drivers. | |
1da177e4 | 1071 | */ |
2e60e022 TH |
1072 | extern bool blk_update_request(struct request *rq, int error, |
1073 | unsigned int nr_bytes); | |
12120077 | 1074 | extern void blk_finish_request(struct request *rq, int error); |
b1f74493 FT |
1075 | extern bool blk_end_request(struct request *rq, int error, |
1076 | unsigned int nr_bytes); | |
1077 | extern void blk_end_request_all(struct request *rq, int error); | |
1078 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1079 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
1080 | extern bool __blk_end_request(struct request *rq, int error, |
1081 | unsigned int nr_bytes); | |
1082 | extern void __blk_end_request_all(struct request *rq, int error); | |
1083 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 1084 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 1085 | |
ff856bad | 1086 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1087 | extern void __blk_complete_request(struct request *); |
1088 | extern void blk_abort_request(struct request *); | |
28018c24 | 1089 | extern void blk_unprep_request(struct request *); |
ff856bad | 1090 | |
1da177e4 LT |
1091 | /* |
1092 | * Access functions for manipulating queue properties | |
1093 | */ | |
165125e1 | 1094 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1095 | spinlock_t *lock, int node_id); |
165125e1 | 1096 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
1097 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
1098 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
1099 | extern void blk_cleanup_queue(struct request_queue *); |
1100 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1101 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1102 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1103 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1104 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 1105 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1106 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1107 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1108 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1109 | unsigned int max_write_same_sectors); | |
e1defc4f | 1110 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1111 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1112 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1113 | unsigned int alignment); | |
7c958e32 | 1114 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1115 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1116 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1117 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 1118 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1119 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1120 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1121 | sector_t offset); | |
17be8c24 MP |
1122 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1123 | sector_t offset); | |
c72758f3 MP |
1124 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1125 | sector_t offset); | |
165125e1 | 1126 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1127 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1128 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1129 | extern int blk_queue_dma_drain(struct request_queue *q, |
1130 | dma_drain_needed_fn *dma_drain_needed, | |
1131 | void *buf, unsigned int size); | |
ef9e3fac | 1132 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1133 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1134 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1135 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1136 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1137 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1138 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1139 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1140 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1141 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1142 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1143 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1144 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 1145 | |
165125e1 | 1146 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1147 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1148 | extern long nr_blockdev_pages(void); |
1da177e4 | 1149 | |
09ac46c4 | 1150 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1151 | struct request_queue *blk_alloc_queue(gfp_t); |
1152 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1153 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1154 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1155 | |
6c954667 LM |
1156 | /* |
1157 | * block layer runtime pm functions | |
1158 | */ | |
47fafbc7 | 1159 | #ifdef CONFIG_PM |
6c954667 LM |
1160 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1161 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1162 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1163 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1164 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
d07ab6d1 | 1165 | extern void blk_set_runtime_active(struct request_queue *q); |
6c954667 LM |
1166 | #else |
1167 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1168 | struct device *dev) {} | |
1169 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1170 | { | |
1171 | return -ENOSYS; | |
1172 | } | |
1173 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1174 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1175 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
d07ab6d1 | 1176 | extern inline void blk_set_runtime_active(struct request_queue *q) {} |
6c954667 LM |
1177 | #endif |
1178 | ||
316cc67d | 1179 | /* |
75df7136 SJ |
1180 | * blk_plug permits building a queue of related requests by holding the I/O |
1181 | * fragments for a short period. This allows merging of sequential requests | |
1182 | * into single larger request. As the requests are moved from a per-task list to | |
1183 | * the device's request_queue in a batch, this results in improved scalability | |
1184 | * as the lock contention for request_queue lock is reduced. | |
1185 | * | |
1186 | * It is ok not to disable preemption when adding the request to the plug list | |
1187 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1188 | * the plug list when the task sleeps by itself. For details, please see | |
1189 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1190 | */ |
73c10101 | 1191 | struct blk_plug { |
75df7136 | 1192 | struct list_head list; /* requests */ |
320ae51f | 1193 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1194 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1195 | }; |
55c022bb SL |
1196 | #define BLK_MAX_REQUEST_COUNT 16 |
1197 | ||
9cbb1750 | 1198 | struct blk_plug_cb; |
74018dc3 | 1199 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1200 | struct blk_plug_cb { |
1201 | struct list_head list; | |
9cbb1750 N |
1202 | blk_plug_cb_fn callback; |
1203 | void *data; | |
048c9374 | 1204 | }; |
9cbb1750 N |
1205 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1206 | void *data, int size); | |
73c10101 JA |
1207 | extern void blk_start_plug(struct blk_plug *); |
1208 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1209 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1210 | |
1211 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1212 | { | |
1213 | struct blk_plug *plug = tsk->plug; | |
1214 | ||
a237c1c5 JA |
1215 | if (plug) |
1216 | blk_flush_plug_list(plug, false); | |
1217 | } | |
1218 | ||
1219 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1220 | { | |
1221 | struct blk_plug *plug = tsk->plug; | |
1222 | ||
88b996cd | 1223 | if (plug) |
f6603783 | 1224 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1225 | } |
1226 | ||
1227 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1228 | { | |
1229 | struct blk_plug *plug = tsk->plug; | |
1230 | ||
320ae51f JA |
1231 | return plug && |
1232 | (!list_empty(&plug->list) || | |
1233 | !list_empty(&plug->mq_list) || | |
1234 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1235 | } |
1236 | ||
1da177e4 LT |
1237 | /* |
1238 | * tag stuff | |
1239 | */ | |
165125e1 JA |
1240 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1241 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1242 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1243 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1244 | extern void blk_queue_free_tags(struct request_queue *); |
1245 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1246 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1247 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1248 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1249 | |
f583f492 DS |
1250 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1251 | int tag) | |
1252 | { | |
1253 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1254 | return NULL; | |
1255 | return bqt->tag_index[tag]; | |
1256 | } | |
dd3932ed | 1257 | |
e950fdf7 CH |
1258 | |
1259 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
1260 | #define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */ | |
dd3932ed CH |
1261 | |
1262 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1263 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1264 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1265 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1266 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1267 | struct bio **biop); |
4363ac7c MP |
1268 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1269 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1270 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
d93ba7a5 | 1271 | sector_t nr_sects, gfp_t gfp_mask, bool discard); |
2cf6d26a CH |
1272 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1273 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1274 | { |
2cf6d26a CH |
1275 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1276 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1277 | gfp_mask, flags); | |
fb2dce86 | 1278 | } |
e6fa0be6 | 1279 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1280 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1281 | { |
1282 | return blkdev_issue_zeroout(sb->s_bdev, | |
1283 | block << (sb->s_blocksize_bits - 9), | |
1284 | nr_blocks << (sb->s_blocksize_bits - 9), | |
d93ba7a5 | 1285 | gfp_mask, true); |
e6fa0be6 | 1286 | } |
1da177e4 | 1287 | |
018e0446 | 1288 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1289 | |
eb28d31b MP |
1290 | enum blk_default_limits { |
1291 | BLK_MAX_SEGMENTS = 128, | |
1292 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1293 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1294 | BLK_MAX_SEGMENT_SIZE = 65536, |
1295 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1296 | }; | |
0e435ac2 | 1297 | |
1da177e4 LT |
1298 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1299 | ||
ae03bf63 MP |
1300 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1301 | { | |
025146e1 | 1302 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1303 | } |
1304 | ||
1305 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1306 | { | |
025146e1 | 1307 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1308 | } |
1309 | ||
03100aad KB |
1310 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1311 | { | |
1312 | return q->limits.virt_boundary_mask; | |
1313 | } | |
1314 | ||
ae03bf63 MP |
1315 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1316 | { | |
025146e1 | 1317 | return q->limits.max_sectors; |
ae03bf63 MP |
1318 | } |
1319 | ||
1320 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1321 | { | |
025146e1 | 1322 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1323 | } |
1324 | ||
8a78362c | 1325 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1326 | { |
8a78362c | 1327 | return q->limits.max_segments; |
ae03bf63 MP |
1328 | } |
1329 | ||
1330 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1331 | { | |
025146e1 | 1332 | return q->limits.max_segment_size; |
ae03bf63 MP |
1333 | } |
1334 | ||
e1defc4f | 1335 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1336 | { |
1337 | int retval = 512; | |
1338 | ||
025146e1 MP |
1339 | if (q && q->limits.logical_block_size) |
1340 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1341 | |
1342 | return retval; | |
1343 | } | |
1344 | ||
e1defc4f | 1345 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1346 | { |
e1defc4f | 1347 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1348 | } |
1349 | ||
c72758f3 MP |
1350 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1351 | { | |
1352 | return q->limits.physical_block_size; | |
1353 | } | |
1354 | ||
892b6f90 | 1355 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1356 | { |
1357 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1358 | } | |
1359 | ||
c72758f3 MP |
1360 | static inline unsigned int queue_io_min(struct request_queue *q) |
1361 | { | |
1362 | return q->limits.io_min; | |
1363 | } | |
1364 | ||
ac481c20 MP |
1365 | static inline int bdev_io_min(struct block_device *bdev) |
1366 | { | |
1367 | return queue_io_min(bdev_get_queue(bdev)); | |
1368 | } | |
1369 | ||
c72758f3 MP |
1370 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1371 | { | |
1372 | return q->limits.io_opt; | |
1373 | } | |
1374 | ||
ac481c20 MP |
1375 | static inline int bdev_io_opt(struct block_device *bdev) |
1376 | { | |
1377 | return queue_io_opt(bdev_get_queue(bdev)); | |
1378 | } | |
1379 | ||
c72758f3 MP |
1380 | static inline int queue_alignment_offset(struct request_queue *q) |
1381 | { | |
ac481c20 | 1382 | if (q->limits.misaligned) |
c72758f3 MP |
1383 | return -1; |
1384 | ||
ac481c20 | 1385 | return q->limits.alignment_offset; |
c72758f3 MP |
1386 | } |
1387 | ||
e03a72e1 | 1388 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1389 | { |
1390 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1391 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1392 | |
b8839b8c | 1393 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1394 | } |
1395 | ||
ac481c20 MP |
1396 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1397 | { | |
1398 | struct request_queue *q = bdev_get_queue(bdev); | |
1399 | ||
1400 | if (q->limits.misaligned) | |
1401 | return -1; | |
1402 | ||
1403 | if (bdev != bdev->bd_contains) | |
1404 | return bdev->bd_part->alignment_offset; | |
1405 | ||
1406 | return q->limits.alignment_offset; | |
1407 | } | |
1408 | ||
86b37281 MP |
1409 | static inline int queue_discard_alignment(struct request_queue *q) |
1410 | { | |
1411 | if (q->limits.discard_misaligned) | |
1412 | return -1; | |
1413 | ||
1414 | return q->limits.discard_alignment; | |
1415 | } | |
1416 | ||
e03a72e1 | 1417 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1418 | { |
59771079 | 1419 | unsigned int alignment, granularity, offset; |
dd3d145d | 1420 | |
a934a00a MP |
1421 | if (!lim->max_discard_sectors) |
1422 | return 0; | |
1423 | ||
59771079 LT |
1424 | /* Why are these in bytes, not sectors? */ |
1425 | alignment = lim->discard_alignment >> 9; | |
1426 | granularity = lim->discard_granularity >> 9; | |
1427 | if (!granularity) | |
1428 | return 0; | |
1429 | ||
1430 | /* Offset of the partition start in 'granularity' sectors */ | |
1431 | offset = sector_div(sector, granularity); | |
1432 | ||
1433 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1434 | offset = (granularity + alignment - offset) % granularity; | |
1435 | ||
1436 | /* Turn it back into bytes, gaah */ | |
1437 | return offset << 9; | |
86b37281 MP |
1438 | } |
1439 | ||
c6e66634 PB |
1440 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1441 | { | |
1442 | struct request_queue *q = bdev_get_queue(bdev); | |
1443 | ||
1444 | if (bdev != bdev->bd_contains) | |
1445 | return bdev->bd_part->discard_alignment; | |
1446 | ||
1447 | return q->limits.discard_alignment; | |
1448 | } | |
1449 | ||
98262f27 MP |
1450 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1451 | { | |
a934a00a | 1452 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1453 | return 1; |
1454 | ||
1455 | return 0; | |
1456 | } | |
1457 | ||
1458 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1459 | { | |
1460 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1461 | } | |
1462 | ||
4363ac7c MP |
1463 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1464 | { | |
1465 | struct request_queue *q = bdev_get_queue(bdev); | |
1466 | ||
1467 | if (q) | |
1468 | return q->limits.max_write_same_sectors; | |
1469 | ||
1470 | return 0; | |
1471 | } | |
1472 | ||
797476b8 DLM |
1473 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1474 | { | |
1475 | struct request_queue *q = bdev_get_queue(bdev); | |
1476 | ||
1477 | if (q) | |
1478 | return blk_queue_zoned_model(q); | |
1479 | ||
1480 | return BLK_ZONED_NONE; | |
1481 | } | |
1482 | ||
1483 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1484 | { | |
1485 | struct request_queue *q = bdev_get_queue(bdev); | |
1486 | ||
1487 | if (q) | |
1488 | return blk_queue_is_zoned(q); | |
1489 | ||
1490 | return false; | |
1491 | } | |
1492 | ||
6a0cb1bc HR |
1493 | static inline unsigned int bdev_zone_size(struct block_device *bdev) |
1494 | { | |
1495 | struct request_queue *q = bdev_get_queue(bdev); | |
1496 | ||
1497 | if (q) | |
1498 | return blk_queue_zone_size(q); | |
1499 | ||
1500 | return 0; | |
1501 | } | |
1502 | ||
165125e1 | 1503 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1504 | { |
482eb689 | 1505 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1506 | } |
1507 | ||
14417799 | 1508 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1509 | unsigned int len) |
1510 | { | |
1511 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1512 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1513 | } |
1514 | ||
1da177e4 LT |
1515 | /* assumes size > 256 */ |
1516 | static inline unsigned int blksize_bits(unsigned int size) | |
1517 | { | |
1518 | unsigned int bits = 8; | |
1519 | do { | |
1520 | bits++; | |
1521 | size >>= 1; | |
1522 | } while (size > 256); | |
1523 | return bits; | |
1524 | } | |
1525 | ||
2befb9e3 | 1526 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1527 | { |
1528 | return bdev->bd_block_size; | |
1529 | } | |
1530 | ||
f3876930 | 1531 | static inline bool queue_flush_queueable(struct request_queue *q) |
1532 | { | |
c888a8f9 | 1533 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1534 | } |
1535 | ||
1da177e4 LT |
1536 | typedef struct {struct page *v;} Sector; |
1537 | ||
1538 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1539 | ||
1540 | static inline void put_dev_sector(Sector p) | |
1541 | { | |
09cbfeaf | 1542 | put_page(p.v); |
1da177e4 LT |
1543 | } |
1544 | ||
e0af2917 ML |
1545 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
1546 | struct bio_vec *bprv, unsigned int offset) | |
1547 | { | |
1548 | return offset || | |
1549 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); | |
1550 | } | |
1551 | ||
03100aad KB |
1552 | /* |
1553 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
1554 | * the SG list. Most drivers don't care about this, but some do. | |
1555 | */ | |
1556 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
1557 | struct bio_vec *bprv, unsigned int offset) | |
1558 | { | |
1559 | if (!queue_virt_boundary(q)) | |
1560 | return false; | |
e0af2917 | 1561 | return __bvec_gap_to_prev(q, bprv, offset); |
03100aad KB |
1562 | } |
1563 | ||
5e7c4274 JA |
1564 | static inline bool bio_will_gap(struct request_queue *q, struct bio *prev, |
1565 | struct bio *next) | |
1566 | { | |
25e71a99 ML |
1567 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
1568 | struct bio_vec pb, nb; | |
1569 | ||
1570 | bio_get_last_bvec(prev, &pb); | |
1571 | bio_get_first_bvec(next, &nb); | |
5e7c4274 | 1572 | |
25e71a99 ML |
1573 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); |
1574 | } | |
1575 | ||
1576 | return false; | |
5e7c4274 JA |
1577 | } |
1578 | ||
1579 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) | |
1580 | { | |
1581 | return bio_will_gap(req->q, req->biotail, bio); | |
1582 | } | |
1583 | ||
1584 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) | |
1585 | { | |
1586 | return bio_will_gap(req->q, bio, req->bio); | |
1587 | } | |
1588 | ||
59c3d45e | 1589 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1590 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
59c3d45e | 1591 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
8ab14595 | 1592 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1593 | |
9195291e | 1594 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1595 | /* |
1596 | * This should not be using sched_clock(). A real patch is in progress | |
1597 | * to fix this up, until that is in place we need to disable preemption | |
1598 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1599 | */ | |
9195291e DS |
1600 | static inline void set_start_time_ns(struct request *req) |
1601 | { | |
28f4197e | 1602 | preempt_disable(); |
9195291e | 1603 | req->start_time_ns = sched_clock(); |
28f4197e | 1604 | preempt_enable(); |
9195291e DS |
1605 | } |
1606 | ||
1607 | static inline void set_io_start_time_ns(struct request *req) | |
1608 | { | |
28f4197e | 1609 | preempt_disable(); |
9195291e | 1610 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1611 | preempt_enable(); |
9195291e | 1612 | } |
84c124da DS |
1613 | |
1614 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1615 | { | |
1616 | return req->start_time_ns; | |
1617 | } | |
1618 | ||
1619 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1620 | { | |
1621 | return req->io_start_time_ns; | |
1622 | } | |
9195291e DS |
1623 | #else |
1624 | static inline void set_start_time_ns(struct request *req) {} | |
1625 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1626 | static inline uint64_t rq_start_time_ns(struct request *req) |
1627 | { | |
1628 | return 0; | |
1629 | } | |
1630 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1631 | { | |
1632 | return 0; | |
1633 | } | |
9195291e DS |
1634 | #endif |
1635 | ||
1da177e4 LT |
1636 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1637 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1638 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1639 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1640 | ||
7ba1ba12 MP |
1641 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1642 | ||
8288f496 MP |
1643 | enum blk_integrity_flags { |
1644 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1645 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1646 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1647 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1648 | }; |
7ba1ba12 | 1649 | |
18593088 | 1650 | struct blk_integrity_iter { |
7ba1ba12 MP |
1651 | void *prot_buf; |
1652 | void *data_buf; | |
3be91c4a | 1653 | sector_t seed; |
7ba1ba12 | 1654 | unsigned int data_size; |
3be91c4a | 1655 | unsigned short interval; |
7ba1ba12 MP |
1656 | const char *disk_name; |
1657 | }; | |
1658 | ||
18593088 | 1659 | typedef int (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1660 | |
0f8087ec MP |
1661 | struct blk_integrity_profile { |
1662 | integrity_processing_fn *generate_fn; | |
1663 | integrity_processing_fn *verify_fn; | |
1664 | const char *name; | |
1665 | }; | |
7ba1ba12 | 1666 | |
25520d55 | 1667 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1668 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1669 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1670 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1671 | struct scatterlist *); | |
1672 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1673 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1674 | struct request *); | |
1675 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1676 | struct bio *); | |
7ba1ba12 | 1677 | |
25520d55 | 1678 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1679 | { |
ac6fc48c | 1680 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1681 | |
1682 | if (!bi->profile) | |
1683 | return NULL; | |
1684 | ||
1685 | return bi; | |
b04accc4 JA |
1686 | } |
1687 | ||
25520d55 MP |
1688 | static inline |
1689 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1690 | { |
25520d55 | 1691 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1692 | } |
1693 | ||
180b2f95 | 1694 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1695 | { |
180b2f95 | 1696 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1697 | } |
1698 | ||
13f05c8d MP |
1699 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1700 | unsigned int segs) | |
1701 | { | |
1702 | q->limits.max_integrity_segments = segs; | |
1703 | } | |
1704 | ||
1705 | static inline unsigned short | |
1706 | queue_max_integrity_segments(struct request_queue *q) | |
1707 | { | |
1708 | return q->limits.max_integrity_segments; | |
1709 | } | |
1710 | ||
7f39add3 SG |
1711 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1712 | struct bio *next) | |
1713 | { | |
1714 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
1715 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
1716 | ||
1717 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1718 | bip_next->bip_vec[0].bv_offset); | |
1719 | } | |
1720 | ||
1721 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1722 | struct bio *bio) | |
1723 | { | |
1724 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1725 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
1726 | ||
1727 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1728 | bip_next->bip_vec[0].bv_offset); | |
1729 | } | |
1730 | ||
7ba1ba12 MP |
1731 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1732 | ||
fd83240a SR |
1733 | struct bio; |
1734 | struct block_device; | |
1735 | struct gendisk; | |
1736 | struct blk_integrity; | |
1737 | ||
1738 | static inline int blk_integrity_rq(struct request *rq) | |
1739 | { | |
1740 | return 0; | |
1741 | } | |
1742 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1743 | struct bio *b) | |
1744 | { | |
1745 | return 0; | |
1746 | } | |
1747 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1748 | struct bio *b, | |
1749 | struct scatterlist *s) | |
1750 | { | |
1751 | return 0; | |
1752 | } | |
1753 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1754 | { | |
61a04e5b | 1755 | return NULL; |
fd83240a SR |
1756 | } |
1757 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1758 | { | |
1759 | return NULL; | |
1760 | } | |
1761 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1762 | { | |
1763 | return 0; | |
1764 | } | |
25520d55 | 1765 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1766 | struct blk_integrity *b) |
1767 | { | |
fd83240a SR |
1768 | } |
1769 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1770 | { | |
1771 | } | |
1772 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1773 | unsigned int segs) | |
1774 | { | |
1775 | } | |
1776 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1777 | { | |
1778 | return 0; | |
1779 | } | |
4eaf99be MP |
1780 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1781 | struct request *r1, | |
1782 | struct request *r2) | |
fd83240a | 1783 | { |
cb1a5ab6 | 1784 | return true; |
fd83240a | 1785 | } |
4eaf99be MP |
1786 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1787 | struct request *r, | |
1788 | struct bio *b) | |
fd83240a | 1789 | { |
cb1a5ab6 | 1790 | return true; |
fd83240a | 1791 | } |
25520d55 | 1792 | |
7f39add3 SG |
1793 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1794 | struct bio *next) | |
1795 | { | |
1796 | return false; | |
1797 | } | |
1798 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1799 | struct bio *bio) | |
1800 | { | |
1801 | return false; | |
1802 | } | |
7ba1ba12 MP |
1803 | |
1804 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1805 | ||
b2e0d162 DW |
1806 | /** |
1807 | * struct blk_dax_ctl - control and output parameters for ->direct_access | |
1808 | * @sector: (input) offset relative to a block_device | |
1809 | * @addr: (output) kernel virtual address for @sector populated by driver | |
1810 | * @pfn: (output) page frame number for @addr populated by driver | |
1811 | * @size: (input) number of bytes requested | |
1812 | */ | |
1813 | struct blk_dax_ctl { | |
1814 | sector_t sector; | |
7a9eb206 | 1815 | void *addr; |
b2e0d162 | 1816 | long size; |
34c0fd54 | 1817 | pfn_t pfn; |
b2e0d162 DW |
1818 | }; |
1819 | ||
08f85851 | 1820 | struct block_device_operations { |
d4430d62 | 1821 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1822 | void (*release) (struct gendisk *, fmode_t); |
c11f0c0b | 1823 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
d4430d62 AV |
1824 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1825 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
7a9eb206 DW |
1826 | long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *, |
1827 | long); | |
77ea887e TH |
1828 | unsigned int (*check_events) (struct gendisk *disk, |
1829 | unsigned int clearing); | |
1830 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1831 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1832 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1833 | int (*revalidate_disk) (struct gendisk *); |
1834 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1835 | /* this callback is with swap_lock and sometimes page table lock held */ |
1836 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 | 1837 | struct module *owner; |
bbd3e064 | 1838 | const struct pr_ops *pr_ops; |
08f85851 AV |
1839 | }; |
1840 | ||
633a08b8 AV |
1841 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1842 | unsigned long); | |
47a191fd MW |
1843 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1844 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1845 | struct writeback_control *); | |
b2e0d162 | 1846 | extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *); |
2d96afc8 | 1847 | extern int bdev_dax_supported(struct super_block *, int); |
a8078b1f | 1848 | extern bool bdev_dax_capable(struct block_device *); |
9361401e | 1849 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1850 | |
1851 | struct block_device; | |
1852 | ||
9361401e DH |
1853 | /* |
1854 | * stubs for when the block layer is configured out | |
1855 | */ | |
1856 | #define buffer_heads_over_limit 0 | |
1857 | ||
9361401e DH |
1858 | static inline long nr_blockdev_pages(void) |
1859 | { | |
1860 | return 0; | |
1861 | } | |
1862 | ||
1f940bdf JA |
1863 | struct blk_plug { |
1864 | }; | |
1865 | ||
1866 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1867 | { |
1868 | } | |
1869 | ||
1f940bdf | 1870 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1871 | { |
1872 | } | |
1873 | ||
1f940bdf | 1874 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1875 | { |
1876 | } | |
1877 | ||
a237c1c5 JA |
1878 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1879 | { | |
1880 | } | |
1881 | ||
1882 | ||
73c10101 JA |
1883 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1884 | { | |
1885 | return false; | |
1886 | } | |
1887 | ||
ac13a829 FF |
1888 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1889 | sector_t *error_sector) | |
1890 | { | |
1891 | return 0; | |
1892 | } | |
1893 | ||
9361401e DH |
1894 | #endif /* CONFIG_BLOCK */ |
1895 | ||
1da177e4 | 1896 | #endif |