]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_BLKDEV_H |
3 | #define _LINUX_BLKDEV_H | |
4 | ||
85fd0bc9 | 5 | #include <linux/sched.h> |
e6017571 | 6 | #include <linux/sched/clock.h> |
85fd0bc9 | 7 | |
f5ff8422 JA |
8 | #ifdef CONFIG_BLOCK |
9 | ||
1da177e4 LT |
10 | #include <linux/major.h> |
11 | #include <linux/genhd.h> | |
12 | #include <linux/list.h> | |
320ae51f | 13 | #include <linux/llist.h> |
1da177e4 LT |
14 | #include <linux/timer.h> |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/pagemap.h> | |
66114cad | 17 | #include <linux/backing-dev-defs.h> |
1da177e4 LT |
18 | #include <linux/wait.h> |
19 | #include <linux/mempool.h> | |
34c0fd54 | 20 | #include <linux/pfn.h> |
1da177e4 | 21 | #include <linux/bio.h> |
1da177e4 | 22 | #include <linux/stringify.h> |
3e6053d7 | 23 | #include <linux/gfp.h> |
d351af01 | 24 | #include <linux/bsg.h> |
c7c22e4d | 25 | #include <linux/smp.h> |
548bc8e1 | 26 | #include <linux/rcupdate.h> |
add703fd | 27 | #include <linux/percpu-refcount.h> |
84be456f | 28 | #include <linux/scatterlist.h> |
6a0cb1bc | 29 | #include <linux/blkzoned.h> |
1da177e4 | 30 | |
de477254 | 31 | struct module; |
21b2f0c8 CH |
32 | struct scsi_ioctl_command; |
33 | ||
1da177e4 | 34 | struct request_queue; |
1da177e4 | 35 | struct elevator_queue; |
2056a782 | 36 | struct blk_trace; |
3d6392cf JA |
37 | struct request; |
38 | struct sg_io_hdr; | |
aa387cc8 | 39 | struct bsg_job; |
3c798398 | 40 | struct blkcg_gq; |
7c94e1c1 | 41 | struct blk_flush_queue; |
bbd3e064 | 42 | struct pr_ops; |
a7905043 | 43 | struct rq_qos; |
34dbad5d OS |
44 | struct blk_queue_stats; |
45 | struct blk_stat_callback; | |
1da177e4 LT |
46 | |
47 | #define BLKDEV_MIN_RQ 4 | |
48 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
49 | ||
096392e0 | 50 | /* Must be consistent with blk_mq_poll_stats_bkt() */ |
0206319f SB |
51 | #define BLK_MQ_POLL_STATS_BKTS 16 |
52 | ||
29ece8b4 YY |
53 | /* Doing classic polling */ |
54 | #define BLK_MQ_POLL_CLASSIC -1 | |
55 | ||
8bd435b3 TH |
56 | /* |
57 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
58 | * Defined here to simplify include dependency. | |
59 | */ | |
01c5f85a | 60 | #define BLKCG_MAX_POLS 5 |
8bd435b3 | 61 | |
2a842aca | 62 | typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
1da177e4 | 63 | |
e8064021 CH |
64 | /* |
65 | * request flags */ | |
66 | typedef __u32 __bitwise req_flags_t; | |
67 | ||
68 | /* elevator knows about this request */ | |
69 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
70 | /* drive already may have started this one */ | |
71 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
e8064021 CH |
72 | /* may not be passed by ioscheduler */ |
73 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
74 | /* request for flush sequence */ | |
75 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
76 | /* merge of different types, fail separately */ | |
77 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
78 | /* track inflight for MQ */ | |
79 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
80 | /* don't call prep for this one */ | |
81 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
82 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
83 | "quiesce" state must be ignored. */ | |
84 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
85 | /* contains copies of user pages */ | |
86 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
87 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
88 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
89 | /* don't warn about errors */ | |
90 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
91 | /* elevator private data attached */ | |
92 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
4822e902 | 93 | /* account into disk and partition IO statistics */ |
e8064021 CH |
94 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
95 | /* request came from our alloc pool */ | |
96 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
97 | /* runtime pm request */ | |
98 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
99 | /* on IO scheduler merge hash */ | |
100 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
4822e902 | 101 | /* track IO completion time */ |
cf43e6be | 102 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
f9d03f96 CH |
103 | /* Look at ->special_vec for the actual data payload instead of the |
104 | bio chain. */ | |
105 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
6cc77e9c CH |
106 | /* The per-zone write lock is held for this request */ |
107 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) | |
76a86f9d | 108 | /* already slept for hybrid poll */ |
12f5b931 | 109 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) |
da661267 CH |
110 | /* ->timeout has been called, don't expire again */ |
111 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) | |
e8064021 CH |
112 | |
113 | /* flags that prevent us from merging requests: */ | |
114 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 115 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 116 | |
12f5b931 KB |
117 | /* |
118 | * Request state for blk-mq. | |
119 | */ | |
120 | enum mq_rq_state { | |
121 | MQ_RQ_IDLE = 0, | |
122 | MQ_RQ_IN_FLIGHT = 1, | |
123 | MQ_RQ_COMPLETE = 2, | |
124 | }; | |
125 | ||
1da177e4 | 126 | /* |
af76e555 CH |
127 | * Try to put the fields that are referenced together in the same cacheline. |
128 | * | |
129 | * If you modify this structure, make sure to update blk_rq_init() and | |
130 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
131 | */ |
132 | struct request { | |
165125e1 | 133 | struct request_queue *q; |
320ae51f | 134 | struct blk_mq_ctx *mq_ctx; |
ea4f995e | 135 | struct blk_mq_hw_ctx *mq_hctx; |
e6a1c874 | 136 | |
ef295ecf | 137 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 138 | req_flags_t rq_flags; |
d486f1f2 | 139 | |
2f578aaf | 140 | int tag; |
d486f1f2 JA |
141 | int internal_tag; |
142 | ||
a2dec7b3 | 143 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 144 | unsigned int __data_len; /* total data len */ |
181fdde3 | 145 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
146 | |
147 | struct bio *bio; | |
148 | struct bio *biotail; | |
149 | ||
7c3fb70f JA |
150 | struct list_head queuelist; |
151 | ||
360f92c2 JA |
152 | /* |
153 | * The hash is used inside the scheduler, and killed once the | |
154 | * request reaches the dispatch list. The ipi_list is only used | |
155 | * to queue the request for softirq completion, which is long | |
156 | * after the request has been unhashed (and even removed from | |
157 | * the dispatch list). | |
158 | */ | |
159 | union { | |
160 | struct hlist_node hash; /* merge hash */ | |
161 | struct list_head ipi_list; | |
162 | }; | |
163 | ||
e6a1c874 JA |
164 | /* |
165 | * The rb_node is only used inside the io scheduler, requests | |
166 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 167 | * completion_data share space with the rb_node. |
e6a1c874 JA |
168 | */ |
169 | union { | |
170 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 171 | struct bio_vec special_vec; |
c186794d | 172 | void *completion_data; |
e26738e0 | 173 | int error_count; /* for legacy drivers, don't use */ |
e6a1c874 | 174 | }; |
9817064b | 175 | |
ff7d145f | 176 | /* |
7f1dc8a2 | 177 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
178 | * more they have to dynamically allocate it. Flush requests are |
179 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 180 | * space with the elevator data. |
ff7d145f | 181 | */ |
c186794d | 182 | union { |
a612fddf TH |
183 | struct { |
184 | struct io_cq *icq; | |
185 | void *priv[2]; | |
186 | } elv; | |
187 | ||
c186794d MS |
188 | struct { |
189 | unsigned int seq; | |
190 | struct list_head list; | |
4853abaa | 191 | rq_end_io_fn *saved_end_io; |
c186794d MS |
192 | } flush; |
193 | }; | |
ff7d145f | 194 | |
8f34ee75 | 195 | struct gendisk *rq_disk; |
09e099d4 | 196 | struct hd_struct *part; |
6f816b4b TH |
197 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
198 | /* Time that the first bio started allocating this request. */ | |
199 | u64 alloc_time_ns; | |
200 | #endif | |
201 | /* Time that this request was allocated for this IO. */ | |
522a7775 | 202 | u64 start_time_ns; |
544ccc8d OS |
203 | /* Time that I/O was submitted to the device. */ |
204 | u64 io_start_time_ns; | |
205 | ||
206 | #ifdef CONFIG_BLK_WBT | |
207 | unsigned short wbt_flags; | |
208 | #endif | |
3d244306 HT |
209 | /* |
210 | * rq sectors used for blk stats. It has the same value | |
211 | * with blk_rq_sectors(rq), except that it never be zeroed | |
212 | * by completion. | |
213 | */ | |
214 | unsigned short stats_sectors; | |
544ccc8d OS |
215 | |
216 | /* | |
217 | * Number of scatter-gather DMA addr+len pairs after | |
1da177e4 LT |
218 | * physical address coalescing is performed. |
219 | */ | |
220 | unsigned short nr_phys_segments; | |
7c3fb70f | 221 | |
13f05c8d MP |
222 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
223 | unsigned short nr_integrity_segments; | |
224 | #endif | |
1da177e4 | 225 | |
7c3fb70f | 226 | unsigned short write_hint; |
8f34ee75 JA |
227 | unsigned short ioprio; |
228 | ||
7a85f889 | 229 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 230 | |
12f5b931 KB |
231 | enum mq_rq_state state; |
232 | refcount_t ref; | |
1d9bd516 | 233 | |
0b7576d8 | 234 | unsigned int timeout; |
079076b3 | 235 | unsigned long deadline; |
cb6934f8 | 236 | |
7c3fb70f | 237 | union { |
0a4b6e2f | 238 | struct __call_single_data csd; |
7c3fb70f JA |
239 | u64 fifo_time; |
240 | }; | |
241 | ||
1da177e4 | 242 | /* |
c00895ab | 243 | * completion callback. |
1da177e4 LT |
244 | */ |
245 | rq_end_io_fn *end_io; | |
246 | void *end_io_data; | |
247 | }; | |
248 | ||
14cb0dc6 ML |
249 | static inline bool blk_op_is_scsi(unsigned int op) |
250 | { | |
251 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; | |
252 | } | |
253 | ||
254 | static inline bool blk_op_is_private(unsigned int op) | |
255 | { | |
256 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; | |
257 | } | |
258 | ||
aebf526b CH |
259 | static inline bool blk_rq_is_scsi(struct request *rq) |
260 | { | |
14cb0dc6 | 261 | return blk_op_is_scsi(req_op(rq)); |
aebf526b CH |
262 | } |
263 | ||
264 | static inline bool blk_rq_is_private(struct request *rq) | |
265 | { | |
14cb0dc6 | 266 | return blk_op_is_private(req_op(rq)); |
aebf526b CH |
267 | } |
268 | ||
57292b58 CH |
269 | static inline bool blk_rq_is_passthrough(struct request *rq) |
270 | { | |
aebf526b | 271 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
272 | } |
273 | ||
14cb0dc6 ML |
274 | static inline bool bio_is_passthrough(struct bio *bio) |
275 | { | |
276 | unsigned op = bio_op(bio); | |
277 | ||
278 | return blk_op_is_scsi(op) || blk_op_is_private(op); | |
279 | } | |
280 | ||
766ca442 FLVC |
281 | static inline unsigned short req_get_ioprio(struct request *req) |
282 | { | |
283 | return req->ioprio; | |
284 | } | |
285 | ||
1da177e4 LT |
286 | #include <linux/elevator.h> |
287 | ||
320ae51f JA |
288 | struct blk_queue_ctx; |
289 | ||
dece1635 | 290 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
1da177e4 LT |
291 | |
292 | struct bio_vec; | |
2fb98e84 | 293 | typedef int (dma_drain_needed_fn)(struct request *); |
1da177e4 | 294 | |
242f9dcb | 295 | enum blk_eh_timer_return { |
88b0cfad CH |
296 | BLK_EH_DONE, /* drivers has completed the command */ |
297 | BLK_EH_RESET_TIMER, /* reset timer and try again */ | |
242f9dcb JA |
298 | }; |
299 | ||
1da177e4 LT |
300 | enum blk_queue_state { |
301 | Queue_down, | |
302 | Queue_up, | |
303 | }; | |
304 | ||
ee1b6f7a SL |
305 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
306 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 307 | |
abf54393 FT |
308 | #define BLK_SCSI_MAX_CMDS (256) |
309 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
310 | ||
797476b8 DLM |
311 | /* |
312 | * Zoned block device models (zoned limit). | |
313 | */ | |
314 | enum blk_zoned_model { | |
315 | BLK_ZONED_NONE, /* Regular block device */ | |
316 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
317 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
318 | }; | |
319 | ||
025146e1 MP |
320 | struct queue_limits { |
321 | unsigned long bounce_pfn; | |
322 | unsigned long seg_boundary_mask; | |
03100aad | 323 | unsigned long virt_boundary_mask; |
025146e1 MP |
324 | |
325 | unsigned int max_hw_sectors; | |
ca369d51 | 326 | unsigned int max_dev_sectors; |
762380ad | 327 | unsigned int chunk_sectors; |
025146e1 MP |
328 | unsigned int max_sectors; |
329 | unsigned int max_segment_size; | |
c72758f3 | 330 | unsigned int physical_block_size; |
ad6bf88a | 331 | unsigned int logical_block_size; |
c72758f3 MP |
332 | unsigned int alignment_offset; |
333 | unsigned int io_min; | |
334 | unsigned int io_opt; | |
67efc925 | 335 | unsigned int max_discard_sectors; |
0034af03 | 336 | unsigned int max_hw_discard_sectors; |
4363ac7c | 337 | unsigned int max_write_same_sectors; |
a6f0788e | 338 | unsigned int max_write_zeroes_sectors; |
86b37281 MP |
339 | unsigned int discard_granularity; |
340 | unsigned int discard_alignment; | |
025146e1 | 341 | |
8a78362c | 342 | unsigned short max_segments; |
13f05c8d | 343 | unsigned short max_integrity_segments; |
1e739730 | 344 | unsigned short max_discard_segments; |
025146e1 | 345 | |
c72758f3 | 346 | unsigned char misaligned; |
86b37281 | 347 | unsigned char discard_misaligned; |
c78afc62 | 348 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 349 | enum blk_zoned_model zoned; |
025146e1 MP |
350 | }; |
351 | ||
d4100351 CH |
352 | typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, |
353 | void *data); | |
354 | ||
6a0cb1bc HR |
355 | #ifdef CONFIG_BLK_DEV_ZONED |
356 | ||
d4100351 CH |
357 | #define BLK_ALL_ZONES ((unsigned int)-1) |
358 | int blkdev_report_zones(struct block_device *bdev, sector_t sector, | |
359 | unsigned int nr_zones, report_zones_cb cb, void *data); | |
9b38bb4b | 360 | unsigned int blkdev_nr_zones(struct gendisk *disk); |
6c1b1da5 AJ |
361 | extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, |
362 | sector_t sectors, sector_t nr_sectors, | |
363 | gfp_t gfp_mask); | |
bf505456 | 364 | extern int blk_revalidate_disk_zones(struct gendisk *disk); |
6a0cb1bc | 365 | |
3ed05a98 ST |
366 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
367 | unsigned int cmd, unsigned long arg); | |
e876df1f AJ |
368 | extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, |
369 | unsigned int cmd, unsigned long arg); | |
3ed05a98 ST |
370 | |
371 | #else /* CONFIG_BLK_DEV_ZONED */ | |
372 | ||
9b38bb4b | 373 | static inline unsigned int blkdev_nr_zones(struct gendisk *disk) |
a91e1380 DLM |
374 | { |
375 | return 0; | |
376 | } | |
bf505456 | 377 | |
3ed05a98 ST |
378 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, |
379 | fmode_t mode, unsigned int cmd, | |
380 | unsigned long arg) | |
381 | { | |
382 | return -ENOTTY; | |
383 | } | |
384 | ||
e876df1f AJ |
385 | static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, |
386 | fmode_t mode, unsigned int cmd, | |
387 | unsigned long arg) | |
3ed05a98 ST |
388 | { |
389 | return -ENOTTY; | |
390 | } | |
391 | ||
6a0cb1bc HR |
392 | #endif /* CONFIG_BLK_DEV_ZONED */ |
393 | ||
d7b76301 | 394 | struct request_queue { |
1da177e4 | 395 | struct request *last_merge; |
b374d18a | 396 | struct elevator_queue *elevator; |
1da177e4 | 397 | |
34dbad5d | 398 | struct blk_queue_stats *stats; |
a7905043 | 399 | struct rq_qos *rq_qos; |
87760e5e | 400 | |
1da177e4 | 401 | make_request_fn *make_request_fn; |
2fb98e84 | 402 | dma_drain_needed_fn *dma_drain_needed; |
1da177e4 | 403 | |
f8a5b122 | 404 | const struct blk_mq_ops *mq_ops; |
320ae51f | 405 | |
320ae51f | 406 | /* sw queues */ |
e6cdb092 | 407 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f | 408 | |
d278d4a8 JA |
409 | unsigned int queue_depth; |
410 | ||
320ae51f JA |
411 | /* hw dispatch queues */ |
412 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
413 | unsigned int nr_hw_queues; | |
414 | ||
dc3b17cc | 415 | struct backing_dev_info *backing_dev_info; |
1da177e4 LT |
416 | |
417 | /* | |
418 | * The queue owner gets to use this for whatever they like. | |
419 | * ll_rw_blk doesn't touch it. | |
420 | */ | |
421 | void *queuedata; | |
422 | ||
1da177e4 | 423 | /* |
d7b76301 | 424 | * various queue flags, see QUEUE_* below |
1da177e4 | 425 | */ |
d7b76301 | 426 | unsigned long queue_flags; |
cd84a62e BVA |
427 | /* |
428 | * Number of contexts that have called blk_set_pm_only(). If this | |
429 | * counter is above zero then only RQF_PM and RQF_PREEMPT requests are | |
430 | * processed. | |
431 | */ | |
432 | atomic_t pm_only; | |
1da177e4 | 433 | |
a73f730d TH |
434 | /* |
435 | * ida allocated id for this queue. Used to index queues from | |
436 | * ioctx. | |
437 | */ | |
438 | int id; | |
439 | ||
1da177e4 | 440 | /* |
d7b76301 | 441 | * queue needs bounce pages for pages above this limit |
1da177e4 | 442 | */ |
d7b76301 | 443 | gfp_t bounce_gfp; |
1da177e4 | 444 | |
0d945c1f | 445 | spinlock_t queue_lock; |
1da177e4 LT |
446 | |
447 | /* | |
448 | * queue kobject | |
449 | */ | |
450 | struct kobject kobj; | |
451 | ||
320ae51f JA |
452 | /* |
453 | * mq queue kobject | |
454 | */ | |
1db4909e | 455 | struct kobject *mq_kobj; |
320ae51f | 456 | |
ac6fc48c DW |
457 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
458 | struct blk_integrity integrity; | |
459 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
460 | ||
47fafbc7 | 461 | #ifdef CONFIG_PM |
6c954667 LM |
462 | struct device *dev; |
463 | int rpm_status; | |
464 | unsigned int nr_pending; | |
465 | #endif | |
466 | ||
1da177e4 LT |
467 | /* |
468 | * queue settings | |
469 | */ | |
470 | unsigned long nr_requests; /* Max # of requests */ | |
1da177e4 | 471 | |
fa0ccd83 | 472 | unsigned int dma_drain_size; |
d7b76301 | 473 | void *dma_drain_buffer; |
e3790c7d | 474 | unsigned int dma_pad_mask; |
1da177e4 LT |
475 | unsigned int dma_alignment; |
476 | ||
242f9dcb | 477 | unsigned int rq_timeout; |
64f1c21e | 478 | int poll_nsec; |
34dbad5d OS |
479 | |
480 | struct blk_stat_callback *poll_cb; | |
0206319f | 481 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
34dbad5d | 482 | |
242f9dcb | 483 | struct timer_list timeout; |
287922eb | 484 | struct work_struct timeout_work; |
242f9dcb | 485 | |
a612fddf | 486 | struct list_head icq_list; |
4eef3049 | 487 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 488 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 489 | struct blkcg_gq *root_blkg; |
03aa264a | 490 | struct list_head blkg_list; |
4eef3049 | 491 | #endif |
a612fddf | 492 | |
025146e1 MP |
493 | struct queue_limits limits; |
494 | ||
68c43f13 DLM |
495 | unsigned int required_elevator_features; |
496 | ||
6a5ac984 | 497 | #ifdef CONFIG_BLK_DEV_ZONED |
6cc77e9c CH |
498 | /* |
499 | * Zoned block device information for request dispatch control. | |
500 | * nr_zones is the total number of zones of the device. This is always | |
f216fdd7 CH |
501 | * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones |
502 | * bits which indicates if a zone is conventional (bit set) or | |
503 | * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones | |
6cc77e9c CH |
504 | * bits which indicates if a zone is write locked, that is, if a write |
505 | * request targeting the zone was dispatched. All three fields are | |
506 | * initialized by the low level device driver (e.g. scsi/sd.c). | |
507 | * Stacking drivers (device mappers) may or may not initialize | |
508 | * these fields. | |
ccce20fc BVA |
509 | * |
510 | * Reads of this information must be protected with blk_queue_enter() / | |
511 | * blk_queue_exit(). Modifying this information is only allowed while | |
512 | * no requests are being processed. See also blk_mq_freeze_queue() and | |
513 | * blk_mq_unfreeze_queue(). | |
6cc77e9c CH |
514 | */ |
515 | unsigned int nr_zones; | |
f216fdd7 | 516 | unsigned long *conv_zones_bitmap; |
6cc77e9c | 517 | unsigned long *seq_zones_wlock; |
6a5ac984 | 518 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 519 | |
1da177e4 LT |
520 | /* |
521 | * sg stuff | |
522 | */ | |
523 | unsigned int sg_timeout; | |
524 | unsigned int sg_reserved_size; | |
1946089a | 525 | int node; |
6c5c9341 | 526 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
c780e86d | 527 | struct blk_trace __rcu *blk_trace; |
5acb3cc2 | 528 | struct mutex blk_trace_mutex; |
6c5c9341 | 529 | #endif |
1da177e4 | 530 | /* |
4913efe4 | 531 | * for flush operations |
1da177e4 | 532 | */ |
7c94e1c1 | 533 | struct blk_flush_queue *fq; |
483f4afc | 534 | |
6fca6a61 CH |
535 | struct list_head requeue_list; |
536 | spinlock_t requeue_lock; | |
2849450a | 537 | struct delayed_work requeue_work; |
6fca6a61 | 538 | |
483f4afc | 539 | struct mutex sysfs_lock; |
cecf5d87 | 540 | struct mutex sysfs_dir_lock; |
d351af01 | 541 | |
2f8f1336 ML |
542 | /* |
543 | * for reusing dead hctx instance in case of updating | |
544 | * nr_hw_queues | |
545 | */ | |
546 | struct list_head unused_hctx_list; | |
547 | spinlock_t unused_hctx_lock; | |
548 | ||
7996a8b5 | 549 | int mq_freeze_depth; |
d732580b | 550 | |
d351af01 FT |
551 | #if defined(CONFIG_BLK_DEV_BSG) |
552 | struct bsg_class_device bsg_dev; | |
553 | #endif | |
e43473b7 VG |
554 | |
555 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
556 | /* Throttle data */ | |
557 | struct throtl_data *td; | |
558 | #endif | |
548bc8e1 | 559 | struct rcu_head rcu_head; |
320ae51f | 560 | wait_queue_head_t mq_freeze_wq; |
7996a8b5 BL |
561 | /* |
562 | * Protect concurrent access to q_usage_counter by | |
563 | * percpu_ref_kill() and percpu_ref_reinit(). | |
564 | */ | |
565 | struct mutex mq_freeze_lock; | |
3ef28e83 | 566 | struct percpu_ref q_usage_counter; |
0d2602ca JA |
567 | |
568 | struct blk_mq_tag_set *tag_set; | |
569 | struct list_head tag_set_list; | |
338aa96d | 570 | struct bio_set bio_split; |
4593fdbe | 571 | |
03796c14 | 572 | #ifdef CONFIG_BLK_DEBUG_FS |
07e4fead | 573 | struct dentry *debugfs_dir; |
d332ce09 | 574 | struct dentry *sched_debugfs_dir; |
cc56694f | 575 | struct dentry *rqos_debugfs_dir; |
07e4fead OS |
576 | #endif |
577 | ||
4593fdbe | 578 | bool mq_sysfs_init_done; |
6d247d7f CH |
579 | |
580 | size_t cmd_size; | |
dc9edc44 BVA |
581 | |
582 | struct work_struct release_work; | |
f793dfd3 JA |
583 | |
584 | #define BLK_MAX_WRITE_HINTS 5 | |
585 | u64 write_hints[BLK_MAX_WRITE_HINTS]; | |
1da177e4 LT |
586 | }; |
587 | ||
eca7abf3 JA |
588 | #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ |
589 | #define QUEUE_FLAG_DYING 1 /* queue being torn down */ | |
eca7abf3 JA |
590 | #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ |
591 | #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ | |
592 | #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ | |
593 | #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ | |
594 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ | |
595 | #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ | |
596 | #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ | |
597 | #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ | |
598 | #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ | |
599 | #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ | |
600 | #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ | |
601 | #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ | |
602 | #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ | |
eca7abf3 JA |
603 | #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ |
604 | #define QUEUE_FLAG_WC 17 /* Write back caching */ | |
605 | #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ | |
606 | #define QUEUE_FLAG_DAX 19 /* device supports DAX */ | |
607 | #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ | |
608 | #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ | |
609 | #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ | |
610 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ | |
611 | #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ | |
612 | #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ | |
e84e8f06 | 613 | #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ |
6f816b4b | 614 | #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ |
797e7dbb | 615 | |
94eddfbe | 616 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
6e0de611 | 617 | (1 << QUEUE_FLAG_SAME_COMP)) |
94eddfbe | 618 | |
8814ce8a BVA |
619 | void blk_queue_flag_set(unsigned int flag, struct request_queue *q); |
620 | void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); | |
621 | bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); | |
8814ce8a | 622 | |
1da177e4 | 623 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
3f3299d5 | 624 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 625 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
320ae51f | 626 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 627 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
628 | #define blk_queue_noxmerges(q) \ |
629 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 630 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 631 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 632 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
c15227de | 633 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
e84e8f06 CK |
634 | #define blk_queue_zone_resetall(q) \ |
635 | test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) | |
288dab8a CH |
636 | #define blk_queue_secure_erase(q) \ |
637 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 638 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
9efc160f BVA |
639 | #define blk_queue_scsi_passthrough(q) \ |
640 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) | |
49d92c0d LG |
641 | #define blk_queue_pci_p2pdma(q) \ |
642 | test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) | |
6f816b4b TH |
643 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
644 | #define blk_queue_rq_alloc_time(q) \ | |
645 | test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) | |
646 | #else | |
647 | #define blk_queue_rq_alloc_time(q) false | |
648 | #endif | |
1da177e4 | 649 | |
33659ebb CH |
650 | #define blk_noretry_request(rq) \ |
651 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
652 | REQ_FAILFAST_DRIVER)) | |
f4560ffe | 653 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
cd84a62e | 654 | #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) |
0ce91444 | 655 | #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) |
58c898ba | 656 | #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) |
c9254f2d | 657 | |
cd84a62e BVA |
658 | extern void blk_set_pm_only(struct request_queue *q); |
659 | extern void blk_clear_pm_only(struct request_queue *q); | |
33659ebb | 660 | |
57292b58 CH |
661 | static inline bool blk_account_rq(struct request *rq) |
662 | { | |
663 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
664 | } | |
33659ebb | 665 | |
1da177e4 LT |
666 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
667 | ||
4e1b2d52 | 668 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 669 | |
9d9de535 CH |
670 | #define rq_dma_dir(rq) \ |
671 | (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) | |
672 | ||
3ab3a031 CH |
673 | #define dma_map_bvec(dev, bv, dir, attrs) \ |
674 | dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ | |
675 | (dir), (attrs)) | |
676 | ||
344e9ffc | 677 | static inline bool queue_is_mq(struct request_queue *q) |
49fd524f | 678 | { |
a1ce35fa | 679 | return q->mq_ops; |
49fd524f JA |
680 | } |
681 | ||
797476b8 DLM |
682 | static inline enum blk_zoned_model |
683 | blk_queue_zoned_model(struct request_queue *q) | |
684 | { | |
685 | return q->limits.zoned; | |
686 | } | |
687 | ||
688 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
689 | { | |
690 | switch (blk_queue_zoned_model(q)) { | |
691 | case BLK_ZONED_HA: | |
692 | case BLK_ZONED_HM: | |
693 | return true; | |
694 | default: | |
695 | return false; | |
696 | } | |
697 | } | |
698 | ||
113ab72e | 699 | static inline sector_t blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
700 | { |
701 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
702 | } | |
703 | ||
6a5ac984 | 704 | #ifdef CONFIG_BLK_DEV_ZONED |
965b652e DLM |
705 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
706 | { | |
707 | return blk_queue_is_zoned(q) ? q->nr_zones : 0; | |
708 | } | |
709 | ||
6cc77e9c CH |
710 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
711 | sector_t sector) | |
712 | { | |
713 | if (!blk_queue_is_zoned(q)) | |
714 | return 0; | |
715 | return sector >> ilog2(q->limits.chunk_sectors); | |
716 | } | |
717 | ||
718 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, | |
719 | sector_t sector) | |
720 | { | |
f216fdd7 | 721 | if (!blk_queue_is_zoned(q)) |
6cc77e9c | 722 | return false; |
f216fdd7 CH |
723 | if (!q->conv_zones_bitmap) |
724 | return true; | |
725 | return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); | |
6cc77e9c | 726 | } |
965b652e DLM |
727 | #else /* CONFIG_BLK_DEV_ZONED */ |
728 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) | |
729 | { | |
730 | return 0; | |
731 | } | |
6a5ac984 | 732 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 733 | |
1faa16d2 JA |
734 | static inline bool rq_is_sync(struct request *rq) |
735 | { | |
ef295ecf | 736 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
737 | } |
738 | ||
e2a60da7 MP |
739 | static inline bool rq_mergeable(struct request *rq) |
740 | { | |
57292b58 | 741 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 742 | return false; |
1da177e4 | 743 | |
3a5e02ce MC |
744 | if (req_op(rq) == REQ_OP_FLUSH) |
745 | return false; | |
746 | ||
a6f0788e CK |
747 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
748 | return false; | |
749 | ||
e2a60da7 | 750 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
751 | return false; |
752 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
753 | return false; |
754 | ||
755 | return true; | |
756 | } | |
1da177e4 | 757 | |
4363ac7c MP |
758 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
759 | { | |
efbeccdb CH |
760 | if (bio_page(a) == bio_page(b) && |
761 | bio_offset(a) == bio_offset(b)) | |
4363ac7c MP |
762 | return true; |
763 | ||
764 | return false; | |
765 | } | |
766 | ||
d278d4a8 JA |
767 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
768 | { | |
769 | if (q->queue_depth) | |
770 | return q->queue_depth; | |
771 | ||
772 | return q->nr_requests; | |
773 | } | |
774 | ||
1da177e4 LT |
775 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
776 | ||
777 | /* | |
778 | * standard bounce addresses: | |
779 | * | |
780 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
781 | * BLK_BOUNCE_ANY : don't bounce anything | |
782 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
783 | */ | |
2472892a AK |
784 | |
785 | #if BITS_PER_LONG == 32 | |
1da177e4 | 786 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
787 | #else |
788 | #define BLK_BOUNCE_HIGH -1ULL | |
789 | #endif | |
790 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 791 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 792 | |
3d6392cf JA |
793 | /* |
794 | * default timeout for SG_IO if none specified | |
795 | */ | |
796 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 797 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 798 | |
152e283f FT |
799 | struct rq_map_data { |
800 | struct page **pages; | |
801 | int page_order; | |
802 | int nr_entries; | |
56c451f4 | 803 | unsigned long offset; |
97ae77a1 | 804 | int null_mapped; |
ecb554a8 | 805 | int from_user; |
152e283f FT |
806 | }; |
807 | ||
5705f702 | 808 | struct req_iterator { |
7988613b | 809 | struct bvec_iter iter; |
5705f702 N |
810 | struct bio *bio; |
811 | }; | |
812 | ||
813 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
814 | #define for_each_bio(_bio) \ |
815 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 816 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
817 | if ((rq->bio)) \ |
818 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
819 | ||
5705f702 N |
820 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
821 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 822 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 823 | |
d18d9174 ML |
824 | #define rq_for_each_bvec(bvl, _rq, _iter) \ |
825 | __rq_for_each_bio(_iter.bio, _rq) \ | |
826 | bio_for_each_bvec(bvl, _iter.bio, _iter.iter) | |
827 | ||
4550dd6c | 828 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 829 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 830 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 831 | |
2d4dc890 IL |
832 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
833 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
834 | #endif | |
835 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
836 | extern void rq_flush_dcache_pages(struct request *rq); | |
837 | #else | |
838 | static inline void rq_flush_dcache_pages(struct request *rq) | |
839 | { | |
840 | } | |
841 | #endif | |
842 | ||
1da177e4 LT |
843 | extern int blk_register_queue(struct gendisk *disk); |
844 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 845 | extern blk_qc_t generic_make_request(struct bio *bio); |
f421e1d9 | 846 | extern blk_qc_t direct_make_request(struct bio *bio); |
2a4aa30c | 847 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 848 | extern void blk_put_request(struct request *); |
cd6ce148 | 849 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
ff005a06 | 850 | blk_mq_req_flags_t flags); |
ef9e3fac | 851 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
852 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
853 | struct bio_set *bs, gfp_t gfp_mask, | |
854 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
855 | void *data); | |
856 | extern void blk_rq_unprep_clone(struct request *rq); | |
2a842aca | 857 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
82124d60 | 858 | struct request *rq); |
0abc2a10 | 859 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
af67c31f | 860 | extern void blk_queue_split(struct request_queue *, struct bio **); |
0bfc96cb | 861 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
862 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
863 | unsigned int, void __user *); | |
74f3c8af AV |
864 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
865 | unsigned int, void __user *); | |
e915e872 AV |
866 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
867 | struct scsi_ioctl_command __user *); | |
98aaaec4 AB |
868 | extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); |
869 | extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); | |
3fcfab16 | 870 | |
9a95e4ef | 871 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
2e6edc95 | 872 | extern void blk_queue_exit(struct request_queue *q); |
1da177e4 | 873 | extern void blk_sync_queue(struct request_queue *q); |
a3bce90e | 874 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
875 | struct rq_map_data *, void __user *, unsigned long, |
876 | gfp_t); | |
8e5cfc45 | 877 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
878 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
879 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
880 | struct rq_map_data *, const struct iov_iter *, |
881 | gfp_t); | |
b7819b92 | 882 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 883 | struct request *, int); |
165125e1 | 884 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 885 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 886 | |
e47bc4ed CK |
887 | /* Helper to convert REQ_OP_XXX to its string format XXX */ |
888 | extern const char *blk_op_str(unsigned int op); | |
889 | ||
2a842aca CH |
890 | int blk_status_to_errno(blk_status_t status); |
891 | blk_status_t errno_to_blk_status(int errno); | |
892 | ||
0a1b8b87 | 893 | int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); |
05229bee | 894 | |
165125e1 | 895 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 896 | { |
ff9ea323 | 897 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
898 | } |
899 | ||
233bde21 BVA |
900 | /* |
901 | * The basic unit of block I/O is a sector. It is used in a number of contexts | |
902 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 | |
903 | * bytes. Variables of type sector_t represent an offset or size that is a | |
904 | * multiple of 512 bytes. Hence these two constants. | |
905 | */ | |
906 | #ifndef SECTOR_SHIFT | |
907 | #define SECTOR_SHIFT 9 | |
908 | #endif | |
909 | #ifndef SECTOR_SIZE | |
910 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) | |
911 | #endif | |
912 | ||
5efccd17 | 913 | /* |
80a761fd TH |
914 | * blk_rq_pos() : the current sector |
915 | * blk_rq_bytes() : bytes left in the entire request | |
916 | * blk_rq_cur_bytes() : bytes left in the current segment | |
917 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
918 | * blk_rq_sectors() : sectors left in the entire request | |
919 | * blk_rq_cur_sectors() : sectors left in the current segment | |
3d244306 | 920 | * blk_rq_stats_sectors() : sectors of the entire request used for stats |
5efccd17 | 921 | */ |
5b93629b TH |
922 | static inline sector_t blk_rq_pos(const struct request *rq) |
923 | { | |
a2dec7b3 | 924 | return rq->__sector; |
2e46e8b2 TH |
925 | } |
926 | ||
927 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
928 | { | |
a2dec7b3 | 929 | return rq->__data_len; |
5b93629b TH |
930 | } |
931 | ||
2e46e8b2 TH |
932 | static inline int blk_rq_cur_bytes(const struct request *rq) |
933 | { | |
934 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
935 | } | |
5efccd17 | 936 | |
80a761fd TH |
937 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
938 | ||
5b93629b TH |
939 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
940 | { | |
233bde21 | 941 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
942 | } |
943 | ||
944 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
945 | { | |
233bde21 | 946 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
947 | } |
948 | ||
3d244306 HT |
949 | static inline unsigned int blk_rq_stats_sectors(const struct request *rq) |
950 | { | |
951 | return rq->stats_sectors; | |
952 | } | |
953 | ||
6a5ac984 | 954 | #ifdef CONFIG_BLK_DEV_ZONED |
02694e86 CK |
955 | |
956 | /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ | |
957 | const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); | |
958 | ||
6cc77e9c CH |
959 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
960 | { | |
961 | return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); | |
962 | } | |
963 | ||
964 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) | |
965 | { | |
966 | return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); | |
967 | } | |
6a5ac984 | 968 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 969 | |
2e3258ec CH |
970 | /* |
971 | * Some commands like WRITE SAME have a payload or data transfer size which | |
972 | * is different from the size of the request. Any driver that supports such | |
973 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
974 | * calculate the data transfer size. | |
975 | */ | |
976 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
977 | { | |
978 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
979 | return rq->special_vec.bv_len; | |
980 | return blk_rq_bytes(rq); | |
981 | } | |
982 | ||
3aef3cae CH |
983 | /* |
984 | * Return the first full biovec in the request. The caller needs to check that | |
985 | * there are any bvecs before calling this helper. | |
986 | */ | |
987 | static inline struct bio_vec req_bvec(struct request *rq) | |
988 | { | |
989 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
990 | return rq->special_vec; | |
991 | return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); | |
992 | } | |
993 | ||
f31dc1cd | 994 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 995 | int op) |
f31dc1cd | 996 | { |
7afafc8a | 997 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
233bde21 BVA |
998 | return min(q->limits.max_discard_sectors, |
999 | UINT_MAX >> SECTOR_SHIFT); | |
f31dc1cd | 1000 | |
8fe0d473 | 1001 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1002 | return q->limits.max_write_same_sectors; |
1003 | ||
a6f0788e CK |
1004 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1005 | return q->limits.max_write_zeroes_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 | 1019 | |
15bfd21f KB |
1020 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
1021 | (offset & (q->limits.chunk_sectors - 1)))); | |
762380ad JA |
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 | ||
57292b58 | 1029 | if (blk_rq_is_passthrough(rq)) |
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 | ||
ef71de8b CH |
1052 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1053 | ||
1da177e4 | 1054 | /* |
2e60e022 TH |
1055 | * Request completion related functions. |
1056 | * | |
1057 | * blk_update_request() completes given number of bytes and updates | |
1058 | * the request without completing it. | |
1da177e4 | 1059 | */ |
2a842aca | 1060 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
2e60e022 | 1061 | unsigned int nr_bytes); |
2e60e022 | 1062 | |
242f9dcb JA |
1063 | extern void __blk_complete_request(struct request *); |
1064 | extern void blk_abort_request(struct request *); | |
ff856bad | 1065 | |
1da177e4 LT |
1066 | /* |
1067 | * Access functions for manipulating queue properties | |
1068 | */ | |
165125e1 | 1069 | extern void blk_cleanup_queue(struct request_queue *); |
165125e1 | 1070 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
086fa5ff | 1071 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1072 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1073 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1e739730 CH |
1074 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1075 | unsigned short); | |
165125e1 | 1076 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1077 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1078 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1079 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1080 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1081 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1082 | unsigned int max_write_same_sectors); | |
ad6bf88a | 1083 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); |
892b6f90 | 1084 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1085 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1086 | unsigned int alignment); | |
7c958e32 | 1087 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1088 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1089 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1090 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1091 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1092 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1093 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1094 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1095 | sector_t offset); | |
17be8c24 MP |
1096 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1097 | sector_t offset); | |
c72758f3 MP |
1098 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1099 | sector_t offset); | |
165125e1 | 1100 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
27f8221a | 1101 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1102 | extern int blk_queue_dma_drain(struct request_queue *q, |
1103 | dma_drain_needed_fn *dma_drain_needed, | |
1104 | void *buf, unsigned int size); | |
165125e1 | 1105 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1106 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1107 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1108 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
242f9dcb | 1109 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
93e9d8e8 | 1110 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
68c43f13 DLM |
1111 | extern void blk_queue_required_elevator_features(struct request_queue *q, |
1112 | unsigned int features); | |
45147fb5 YS |
1113 | extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, |
1114 | struct device *dev); | |
1da177e4 | 1115 | |
1e739730 CH |
1116 | /* |
1117 | * Number of physical segments as sent to the device. | |
1118 | * | |
1119 | * Normally this is the number of discontiguous data segments sent by the | |
1120 | * submitter. But for data-less command like discard we might have no | |
1121 | * actual data segments submitted, but the driver might have to add it's | |
1122 | * own special payload. In that case we still return 1 here so that this | |
1123 | * special payload will be mapped. | |
1124 | */ | |
f9d03f96 CH |
1125 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1126 | { | |
1127 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1128 | return 1; | |
1129 | return rq->nr_phys_segments; | |
1130 | } | |
1131 | ||
1e739730 CH |
1132 | /* |
1133 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1134 | * Each discard bio merged into a request is counted as one segment. | |
1135 | */ | |
1136 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1137 | { | |
1138 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1139 | } | |
1140 | ||
165125e1 | 1141 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1142 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1143 | extern long nr_blockdev_pages(void); |
1da177e4 | 1144 | |
09ac46c4 | 1145 | bool __must_check blk_get_queue(struct request_queue *); |
3d745ea5 | 1146 | struct request_queue *blk_alloc_queue(make_request_fn make_request, int node_id); |
165125e1 | 1147 | extern void blk_put_queue(struct request_queue *); |
3f21c265 | 1148 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1149 | |
316cc67d | 1150 | /* |
75df7136 SJ |
1151 | * blk_plug permits building a queue of related requests by holding the I/O |
1152 | * fragments for a short period. This allows merging of sequential requests | |
1153 | * into single larger request. As the requests are moved from a per-task list to | |
1154 | * the device's request_queue in a batch, this results in improved scalability | |
1155 | * as the lock contention for request_queue lock is reduced. | |
1156 | * | |
1157 | * It is ok not to disable preemption when adding the request to the plug list | |
1158 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1159 | * the plug list when the task sleeps by itself. For details, please see | |
1160 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1161 | */ |
73c10101 | 1162 | struct blk_plug { |
320ae51f | 1163 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1164 | struct list_head cb_list; /* md requires an unplug callback */ |
5f0ed774 | 1165 | unsigned short rq_count; |
ce5b009c | 1166 | bool multiple_queues; |
73c10101 | 1167 | }; |
55c022bb | 1168 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1169 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1170 | |
9cbb1750 | 1171 | struct blk_plug_cb; |
74018dc3 | 1172 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1173 | struct blk_plug_cb { |
1174 | struct list_head list; | |
9cbb1750 N |
1175 | blk_plug_cb_fn callback; |
1176 | void *data; | |
048c9374 | 1177 | }; |
9cbb1750 N |
1178 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1179 | void *data, int size); | |
73c10101 JA |
1180 | extern void blk_start_plug(struct blk_plug *); |
1181 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1182 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1183 | |
1184 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1185 | { | |
1186 | struct blk_plug *plug = tsk->plug; | |
1187 | ||
a237c1c5 JA |
1188 | if (plug) |
1189 | blk_flush_plug_list(plug, false); | |
1190 | } | |
1191 | ||
1192 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1193 | { | |
1194 | struct blk_plug *plug = tsk->plug; | |
1195 | ||
88b996cd | 1196 | if (plug) |
f6603783 | 1197 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1198 | } |
1199 | ||
1200 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1201 | { | |
1202 | struct blk_plug *plug = tsk->plug; | |
1203 | ||
320ae51f | 1204 | return plug && |
a1ce35fa | 1205 | (!list_empty(&plug->mq_list) || |
320ae51f | 1206 | !list_empty(&plug->cb_list)); |
73c10101 JA |
1207 | } |
1208 | ||
ee472d83 CH |
1209 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1210 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
1211 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e950fdf7 CH |
1212 | |
1213 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
dd3932ed | 1214 | |
fbd9b09a DM |
1215 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1216 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1217 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1218 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1219 | struct bio **biop); |
ee472d83 CH |
1220 | |
1221 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ | |
cb365b96 | 1222 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
ee472d83 | 1223 | |
e73c23ff CK |
1224 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1225 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 1226 | unsigned flags); |
3f14d792 | 1227 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 CH |
1228 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1229 | ||
2cf6d26a CH |
1230 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1231 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1232 | { |
233bde21 BVA |
1233 | return blkdev_issue_discard(sb->s_bdev, |
1234 | block << (sb->s_blocksize_bits - | |
1235 | SECTOR_SHIFT), | |
1236 | nr_blocks << (sb->s_blocksize_bits - | |
1237 | SECTOR_SHIFT), | |
2cf6d26a | 1238 | gfp_mask, flags); |
fb2dce86 | 1239 | } |
e6fa0be6 | 1240 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1241 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1242 | { |
1243 | return blkdev_issue_zeroout(sb->s_bdev, | |
233bde21 BVA |
1244 | block << (sb->s_blocksize_bits - |
1245 | SECTOR_SHIFT), | |
1246 | nr_blocks << (sb->s_blocksize_bits - | |
1247 | SECTOR_SHIFT), | |
ee472d83 | 1248 | gfp_mask, 0); |
e6fa0be6 | 1249 | } |
1da177e4 | 1250 | |
f00c4d80 | 1251 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
0b07de85 | 1252 | |
eb28d31b MP |
1253 | enum blk_default_limits { |
1254 | BLK_MAX_SEGMENTS = 128, | |
1255 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1256 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1257 | BLK_MAX_SEGMENT_SIZE = 65536, |
1258 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1259 | }; | |
0e435ac2 | 1260 | |
af2c68fe | 1261 | static inline unsigned long queue_segment_boundary(const struct request_queue *q) |
ae03bf63 | 1262 | { |
025146e1 | 1263 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1264 | } |
1265 | ||
af2c68fe | 1266 | static inline unsigned long queue_virt_boundary(const struct request_queue *q) |
03100aad KB |
1267 | { |
1268 | return q->limits.virt_boundary_mask; | |
1269 | } | |
1270 | ||
af2c68fe | 1271 | static inline unsigned int queue_max_sectors(const struct request_queue *q) |
ae03bf63 | 1272 | { |
025146e1 | 1273 | return q->limits.max_sectors; |
ae03bf63 MP |
1274 | } |
1275 | ||
af2c68fe | 1276 | static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) |
ae03bf63 | 1277 | { |
025146e1 | 1278 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1279 | } |
1280 | ||
af2c68fe | 1281 | static inline unsigned short queue_max_segments(const struct request_queue *q) |
ae03bf63 | 1282 | { |
8a78362c | 1283 | return q->limits.max_segments; |
ae03bf63 MP |
1284 | } |
1285 | ||
af2c68fe | 1286 | static inline unsigned short queue_max_discard_segments(const struct request_queue *q) |
1e739730 CH |
1287 | { |
1288 | return q->limits.max_discard_segments; | |
1289 | } | |
1290 | ||
af2c68fe | 1291 | static inline unsigned int queue_max_segment_size(const struct request_queue *q) |
ae03bf63 | 1292 | { |
025146e1 | 1293 | return q->limits.max_segment_size; |
ae03bf63 MP |
1294 | } |
1295 | ||
ad6bf88a | 1296 | static inline unsigned queue_logical_block_size(const struct request_queue *q) |
1da177e4 LT |
1297 | { |
1298 | int retval = 512; | |
1299 | ||
025146e1 MP |
1300 | if (q && q->limits.logical_block_size) |
1301 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1302 | |
1303 | return retval; | |
1304 | } | |
1305 | ||
ad6bf88a | 1306 | static inline unsigned int bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1307 | { |
e1defc4f | 1308 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1309 | } |
1310 | ||
af2c68fe | 1311 | static inline unsigned int queue_physical_block_size(const struct request_queue *q) |
c72758f3 MP |
1312 | { |
1313 | return q->limits.physical_block_size; | |
1314 | } | |
1315 | ||
892b6f90 | 1316 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1317 | { |
1318 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1319 | } | |
1320 | ||
af2c68fe | 1321 | static inline unsigned int queue_io_min(const struct request_queue *q) |
c72758f3 MP |
1322 | { |
1323 | return q->limits.io_min; | |
1324 | } | |
1325 | ||
ac481c20 MP |
1326 | static inline int bdev_io_min(struct block_device *bdev) |
1327 | { | |
1328 | return queue_io_min(bdev_get_queue(bdev)); | |
1329 | } | |
1330 | ||
af2c68fe | 1331 | static inline unsigned int queue_io_opt(const struct request_queue *q) |
c72758f3 MP |
1332 | { |
1333 | return q->limits.io_opt; | |
1334 | } | |
1335 | ||
ac481c20 MP |
1336 | static inline int bdev_io_opt(struct block_device *bdev) |
1337 | { | |
1338 | return queue_io_opt(bdev_get_queue(bdev)); | |
1339 | } | |
1340 | ||
af2c68fe | 1341 | static inline int queue_alignment_offset(const struct request_queue *q) |
c72758f3 | 1342 | { |
ac481c20 | 1343 | if (q->limits.misaligned) |
c72758f3 MP |
1344 | return -1; |
1345 | ||
ac481c20 | 1346 | return q->limits.alignment_offset; |
c72758f3 MP |
1347 | } |
1348 | ||
e03a72e1 | 1349 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1350 | { |
1351 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
233bde21 BVA |
1352 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
1353 | << SECTOR_SHIFT; | |
81744ee4 | 1354 | |
b8839b8c | 1355 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1356 | } |
1357 | ||
ac481c20 MP |
1358 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1359 | { | |
1360 | struct request_queue *q = bdev_get_queue(bdev); | |
1361 | ||
1362 | if (q->limits.misaligned) | |
1363 | return -1; | |
1364 | ||
1365 | if (bdev != bdev->bd_contains) | |
1366 | return bdev->bd_part->alignment_offset; | |
1367 | ||
1368 | return q->limits.alignment_offset; | |
1369 | } | |
1370 | ||
af2c68fe | 1371 | static inline int queue_discard_alignment(const struct request_queue *q) |
86b37281 MP |
1372 | { |
1373 | if (q->limits.discard_misaligned) | |
1374 | return -1; | |
1375 | ||
1376 | return q->limits.discard_alignment; | |
1377 | } | |
1378 | ||
e03a72e1 | 1379 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1380 | { |
59771079 | 1381 | unsigned int alignment, granularity, offset; |
dd3d145d | 1382 | |
a934a00a MP |
1383 | if (!lim->max_discard_sectors) |
1384 | return 0; | |
1385 | ||
59771079 | 1386 | /* Why are these in bytes, not sectors? */ |
233bde21 BVA |
1387 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
1388 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
59771079 LT |
1389 | if (!granularity) |
1390 | return 0; | |
1391 | ||
1392 | /* Offset of the partition start in 'granularity' sectors */ | |
1393 | offset = sector_div(sector, granularity); | |
1394 | ||
1395 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1396 | offset = (granularity + alignment - offset) % granularity; | |
1397 | ||
1398 | /* Turn it back into bytes, gaah */ | |
233bde21 | 1399 | return offset << SECTOR_SHIFT; |
86b37281 MP |
1400 | } |
1401 | ||
c6e66634 PB |
1402 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1403 | { | |
1404 | struct request_queue *q = bdev_get_queue(bdev); | |
1405 | ||
1406 | if (bdev != bdev->bd_contains) | |
1407 | return bdev->bd_part->discard_alignment; | |
1408 | ||
1409 | return q->limits.discard_alignment; | |
1410 | } | |
1411 | ||
4363ac7c MP |
1412 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1413 | { | |
1414 | struct request_queue *q = bdev_get_queue(bdev); | |
1415 | ||
1416 | if (q) | |
1417 | return q->limits.max_write_same_sectors; | |
1418 | ||
1419 | return 0; | |
1420 | } | |
1421 | ||
a6f0788e CK |
1422 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1423 | { | |
1424 | struct request_queue *q = bdev_get_queue(bdev); | |
1425 | ||
1426 | if (q) | |
1427 | return q->limits.max_write_zeroes_sectors; | |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
797476b8 DLM |
1432 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1433 | { | |
1434 | struct request_queue *q = bdev_get_queue(bdev); | |
1435 | ||
1436 | if (q) | |
1437 | return blk_queue_zoned_model(q); | |
1438 | ||
1439 | return BLK_ZONED_NONE; | |
1440 | } | |
1441 | ||
1442 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1443 | { | |
1444 | struct request_queue *q = bdev_get_queue(bdev); | |
1445 | ||
1446 | if (q) | |
1447 | return blk_queue_is_zoned(q); | |
1448 | ||
1449 | return false; | |
1450 | } | |
1451 | ||
113ab72e | 1452 | static inline sector_t bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1453 | { |
1454 | struct request_queue *q = bdev_get_queue(bdev); | |
1455 | ||
1456 | if (q) | |
f99e8648 | 1457 | return blk_queue_zone_sectors(q); |
6cc77e9c CH |
1458 | return 0; |
1459 | } | |
6a0cb1bc | 1460 | |
af2c68fe | 1461 | static inline int queue_dma_alignment(const struct request_queue *q) |
1da177e4 | 1462 | { |
482eb689 | 1463 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1464 | } |
1465 | ||
14417799 | 1466 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1467 | unsigned int len) |
1468 | { | |
1469 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1470 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1471 | } |
1472 | ||
1da177e4 LT |
1473 | /* assumes size > 256 */ |
1474 | static inline unsigned int blksize_bits(unsigned int size) | |
1475 | { | |
1476 | unsigned int bits = 8; | |
1477 | do { | |
1478 | bits++; | |
1479 | size >>= 1; | |
1480 | } while (size > 256); | |
1481 | return bits; | |
1482 | } | |
1483 | ||
2befb9e3 | 1484 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1485 | { |
1486 | return bdev->bd_block_size; | |
1487 | } | |
1488 | ||
59c3d45e | 1489 | int kblockd_schedule_work(struct work_struct *work); |
818cd1cb | 1490 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1491 | |
1da177e4 LT |
1492 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1493 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1494 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1495 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1496 | ||
7ba1ba12 MP |
1497 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1498 | ||
8288f496 MP |
1499 | enum blk_integrity_flags { |
1500 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1501 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1502 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1503 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1504 | }; |
7ba1ba12 | 1505 | |
18593088 | 1506 | struct blk_integrity_iter { |
7ba1ba12 MP |
1507 | void *prot_buf; |
1508 | void *data_buf; | |
3be91c4a | 1509 | sector_t seed; |
7ba1ba12 | 1510 | unsigned int data_size; |
3be91c4a | 1511 | unsigned short interval; |
7ba1ba12 MP |
1512 | const char *disk_name; |
1513 | }; | |
1514 | ||
4e4cbee9 | 1515 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
54d4e6ab MG |
1516 | typedef void (integrity_prepare_fn) (struct request *); |
1517 | typedef void (integrity_complete_fn) (struct request *, unsigned int); | |
7ba1ba12 | 1518 | |
0f8087ec MP |
1519 | struct blk_integrity_profile { |
1520 | integrity_processing_fn *generate_fn; | |
1521 | integrity_processing_fn *verify_fn; | |
54d4e6ab MG |
1522 | integrity_prepare_fn *prepare_fn; |
1523 | integrity_complete_fn *complete_fn; | |
0f8087ec MP |
1524 | const char *name; |
1525 | }; | |
7ba1ba12 | 1526 | |
25520d55 | 1527 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1528 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1529 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1530 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1531 | struct scatterlist *); | |
1532 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1533 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1534 | struct request *); | |
1535 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1536 | struct bio *); | |
7ba1ba12 | 1537 | |
25520d55 | 1538 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1539 | { |
ac6fc48c | 1540 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1541 | |
1542 | if (!bi->profile) | |
1543 | return NULL; | |
1544 | ||
1545 | return bi; | |
b04accc4 JA |
1546 | } |
1547 | ||
25520d55 MP |
1548 | static inline |
1549 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1550 | { |
25520d55 | 1551 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1552 | } |
1553 | ||
180b2f95 | 1554 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1555 | { |
180b2f95 | 1556 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1557 | } |
1558 | ||
13f05c8d MP |
1559 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1560 | unsigned int segs) | |
1561 | { | |
1562 | q->limits.max_integrity_segments = segs; | |
1563 | } | |
1564 | ||
1565 | static inline unsigned short | |
af2c68fe | 1566 | queue_max_integrity_segments(const struct request_queue *q) |
13f05c8d MP |
1567 | { |
1568 | return q->limits.max_integrity_segments; | |
1569 | } | |
1570 | ||
359f6427 GE |
1571 | /** |
1572 | * bio_integrity_intervals - Return number of integrity intervals for a bio | |
1573 | * @bi: blk_integrity profile for device | |
1574 | * @sectors: Size of the bio in 512-byte sectors | |
1575 | * | |
1576 | * Description: The block layer calculates everything in 512 byte | |
1577 | * sectors but integrity metadata is done in terms of the data integrity | |
1578 | * interval size of the storage device. Convert the block layer sectors | |
1579 | * to the appropriate number of integrity intervals. | |
1580 | */ | |
1581 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, | |
1582 | unsigned int sectors) | |
1583 | { | |
1584 | return sectors >> (bi->interval_exp - 9); | |
1585 | } | |
1586 | ||
1587 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1588 | unsigned int sectors) | |
1589 | { | |
1590 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; | |
1591 | } | |
1592 | ||
2a876f5e CH |
1593 | /* |
1594 | * Return the first bvec that contains integrity data. Only drivers that are | |
1595 | * limited to a single integrity segment should use this helper. | |
1596 | */ | |
1597 | static inline struct bio_vec *rq_integrity_vec(struct request *rq) | |
1598 | { | |
1599 | if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) | |
1600 | return NULL; | |
1601 | return rq->bio->bi_integrity->bip_vec; | |
1602 | } | |
1603 | ||
7ba1ba12 MP |
1604 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1605 | ||
fd83240a SR |
1606 | struct bio; |
1607 | struct block_device; | |
1608 | struct gendisk; | |
1609 | struct blk_integrity; | |
1610 | ||
1611 | static inline int blk_integrity_rq(struct request *rq) | |
1612 | { | |
1613 | return 0; | |
1614 | } | |
1615 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1616 | struct bio *b) | |
1617 | { | |
1618 | return 0; | |
1619 | } | |
1620 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1621 | struct bio *b, | |
1622 | struct scatterlist *s) | |
1623 | { | |
1624 | return 0; | |
1625 | } | |
1626 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1627 | { | |
61a04e5b | 1628 | return NULL; |
fd83240a SR |
1629 | } |
1630 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1631 | { | |
1632 | return NULL; | |
1633 | } | |
1634 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1635 | { | |
1636 | return 0; | |
1637 | } | |
25520d55 | 1638 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1639 | struct blk_integrity *b) |
1640 | { | |
fd83240a SR |
1641 | } |
1642 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1643 | { | |
1644 | } | |
1645 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1646 | unsigned int segs) | |
1647 | { | |
1648 | } | |
af2c68fe | 1649 | static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) |
fd83240a SR |
1650 | { |
1651 | return 0; | |
1652 | } | |
4eaf99be MP |
1653 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1654 | struct request *r1, | |
1655 | struct request *r2) | |
fd83240a | 1656 | { |
cb1a5ab6 | 1657 | return true; |
fd83240a | 1658 | } |
4eaf99be MP |
1659 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1660 | struct request *r, | |
1661 | struct bio *b) | |
fd83240a | 1662 | { |
cb1a5ab6 | 1663 | return true; |
fd83240a | 1664 | } |
25520d55 | 1665 | |
359f6427 GE |
1666 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
1667 | unsigned int sectors) | |
1668 | { | |
1669 | return 0; | |
1670 | } | |
1671 | ||
1672 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1673 | unsigned int sectors) | |
1674 | { | |
1675 | return 0; | |
1676 | } | |
1677 | ||
2a876f5e CH |
1678 | static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
1679 | { | |
1680 | return NULL; | |
1681 | } | |
1682 | ||
7ba1ba12 MP |
1683 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1684 | ||
08f85851 | 1685 | struct block_device_operations { |
d4430d62 | 1686 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1687 | void (*release) (struct gendisk *, fmode_t); |
3f289dcb | 1688 | int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); |
d4430d62 AV |
1689 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1690 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
77ea887e TH |
1691 | unsigned int (*check_events) (struct gendisk *disk, |
1692 | unsigned int clearing); | |
1693 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1694 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1695 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1696 | int (*revalidate_disk) (struct gendisk *); |
1697 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1698 | /* this callback is with swap_lock and sometimes page table lock held */ |
1699 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
e76239a3 | 1700 | int (*report_zones)(struct gendisk *, sector_t sector, |
d4100351 | 1701 | unsigned int nr_zones, report_zones_cb cb, void *data); |
348e114b | 1702 | char *(*devnode)(struct gendisk *disk, umode_t *mode); |
08f85851 | 1703 | struct module *owner; |
bbd3e064 | 1704 | const struct pr_ops *pr_ops; |
08f85851 AV |
1705 | }; |
1706 | ||
ee6a129d AB |
1707 | #ifdef CONFIG_COMPAT |
1708 | extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, | |
1709 | unsigned int, unsigned long); | |
1710 | #else | |
1711 | #define blkdev_compat_ptr_ioctl NULL | |
1712 | #endif | |
1713 | ||
633a08b8 AV |
1714 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1715 | unsigned long); | |
47a191fd MW |
1716 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1717 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1718 | struct writeback_control *); | |
6cc77e9c CH |
1719 | |
1720 | #ifdef CONFIG_BLK_DEV_ZONED | |
1721 | bool blk_req_needs_zone_write_lock(struct request *rq); | |
1722 | void __blk_req_zone_write_lock(struct request *rq); | |
1723 | void __blk_req_zone_write_unlock(struct request *rq); | |
1724 | ||
1725 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1726 | { | |
1727 | if (blk_req_needs_zone_write_lock(rq)) | |
1728 | __blk_req_zone_write_lock(rq); | |
1729 | } | |
1730 | ||
1731 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1732 | { | |
1733 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) | |
1734 | __blk_req_zone_write_unlock(rq); | |
1735 | } | |
1736 | ||
1737 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1738 | { | |
1739 | return rq->q->seq_zones_wlock && | |
1740 | test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); | |
1741 | } | |
1742 | ||
1743 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1744 | { | |
1745 | if (!blk_req_needs_zone_write_lock(rq)) | |
1746 | return true; | |
1747 | return !blk_req_zone_is_write_locked(rq); | |
1748 | } | |
1749 | #else | |
1750 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) | |
1751 | { | |
1752 | return false; | |
1753 | } | |
1754 | ||
1755 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1756 | { | |
1757 | } | |
1758 | ||
1759 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1760 | { | |
1761 | } | |
1762 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1763 | { | |
1764 | return false; | |
1765 | } | |
1766 | ||
1767 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1768 | { | |
1769 | return true; | |
1770 | } | |
1771 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
1772 | ||
9361401e | 1773 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1774 | |
1775 | struct block_device; | |
1776 | ||
9361401e DH |
1777 | /* |
1778 | * stubs for when the block layer is configured out | |
1779 | */ | |
1780 | #define buffer_heads_over_limit 0 | |
1781 | ||
9361401e DH |
1782 | static inline long nr_blockdev_pages(void) |
1783 | { | |
1784 | return 0; | |
1785 | } | |
1786 | ||
1f940bdf JA |
1787 | struct blk_plug { |
1788 | }; | |
1789 | ||
1790 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1791 | { |
1792 | } | |
1793 | ||
1f940bdf | 1794 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1795 | { |
1796 | } | |
1797 | ||
1f940bdf | 1798 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1799 | { |
1800 | } | |
1801 | ||
a237c1c5 JA |
1802 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1803 | { | |
1804 | } | |
1805 | ||
1806 | ||
73c10101 JA |
1807 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1808 | { | |
1809 | return false; | |
1810 | } | |
1811 | ||
ac13a829 FF |
1812 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1813 | sector_t *error_sector) | |
1814 | { | |
1815 | return 0; | |
1816 | } | |
1817 | ||
9361401e DH |
1818 | #endif /* CONFIG_BLOCK */ |
1819 | ||
0619317f JA |
1820 | static inline void blk_wake_io_task(struct task_struct *waiter) |
1821 | { | |
1822 | /* | |
1823 | * If we're polling, the task itself is doing the completions. For | |
1824 | * that case, we don't need to signal a wakeup, it's enough to just | |
1825 | * mark us as RUNNING. | |
1826 | */ | |
1827 | if (waiter == current) | |
1828 | __set_current_state(TASK_RUNNING); | |
1829 | else | |
1830 | wake_up_process(waiter); | |
1831 | } | |
1832 | ||
1da177e4 | 1833 | #endif |