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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> |
1da177e4 LT |
7 | #include <linux/major.h> |
8 | #include <linux/genhd.h> | |
9 | #include <linux/list.h> | |
320ae51f | 10 | #include <linux/llist.h> |
1da177e4 LT |
11 | #include <linux/timer.h> |
12 | #include <linux/workqueue.h> | |
13 | #include <linux/pagemap.h> | |
66114cad | 14 | #include <linux/backing-dev-defs.h> |
1da177e4 LT |
15 | #include <linux/wait.h> |
16 | #include <linux/mempool.h> | |
34c0fd54 | 17 | #include <linux/pfn.h> |
1da177e4 | 18 | #include <linux/bio.h> |
1da177e4 | 19 | #include <linux/stringify.h> |
3e6053d7 | 20 | #include <linux/gfp.h> |
d351af01 | 21 | #include <linux/bsg.h> |
c7c22e4d | 22 | #include <linux/smp.h> |
548bc8e1 | 23 | #include <linux/rcupdate.h> |
add703fd | 24 | #include <linux/percpu-refcount.h> |
84be456f | 25 | #include <linux/scatterlist.h> |
6a0cb1bc | 26 | #include <linux/blkzoned.h> |
1da177e4 | 27 | |
de477254 | 28 | struct module; |
21b2f0c8 CH |
29 | struct scsi_ioctl_command; |
30 | ||
1da177e4 | 31 | struct request_queue; |
1da177e4 | 32 | struct elevator_queue; |
2056a782 | 33 | struct blk_trace; |
3d6392cf JA |
34 | struct request; |
35 | struct sg_io_hdr; | |
aa387cc8 | 36 | struct bsg_job; |
3c798398 | 37 | struct blkcg_gq; |
7c94e1c1 | 38 | struct blk_flush_queue; |
bbd3e064 | 39 | struct pr_ops; |
a7905043 | 40 | struct rq_qos; |
34dbad5d OS |
41 | struct blk_queue_stats; |
42 | struct blk_stat_callback; | |
1b262839 | 43 | struct blk_keyslot_manager; |
1da177e4 LT |
44 | |
45 | #define BLKDEV_MIN_RQ 4 | |
46 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
47 | ||
096392e0 | 48 | /* Must be consistent with blk_mq_poll_stats_bkt() */ |
0206319f SB |
49 | #define BLK_MQ_POLL_STATS_BKTS 16 |
50 | ||
29ece8b4 YY |
51 | /* Doing classic polling */ |
52 | #define BLK_MQ_POLL_CLASSIC -1 | |
53 | ||
8bd435b3 TH |
54 | /* |
55 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
56 | * Defined here to simplify include dependency. | |
57 | */ | |
01c5f85a | 58 | #define BLKCG_MAX_POLS 5 |
8bd435b3 | 59 | |
2a842aca | 60 | typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
1da177e4 | 61 | |
e8064021 CH |
62 | /* |
63 | * request flags */ | |
64 | typedef __u32 __bitwise req_flags_t; | |
65 | ||
66 | /* elevator knows about this request */ | |
67 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
68 | /* drive already may have started this one */ | |
69 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
e8064021 CH |
70 | /* may not be passed by ioscheduler */ |
71 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
72 | /* request for flush sequence */ | |
73 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
74 | /* merge of different types, fail separately */ | |
75 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
76 | /* track inflight for MQ */ | |
77 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
78 | /* don't call prep for this one */ | |
79 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
80 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
81 | "quiesce" state must be ignored. */ | |
82 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
e8064021 CH |
83 | /* vaguely specified driver internal error. Ignored by the block layer */ |
84 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
85 | /* don't warn about errors */ | |
86 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
87 | /* elevator private data attached */ | |
88 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
4822e902 | 89 | /* account into disk and partition IO statistics */ |
e8064021 CH |
90 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
91 | /* request came from our alloc pool */ | |
92 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
93 | /* runtime pm request */ | |
94 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
95 | /* on IO scheduler merge hash */ | |
96 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
4822e902 | 97 | /* track IO completion time */ |
cf43e6be | 98 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
f9d03f96 CH |
99 | /* Look at ->special_vec for the actual data payload instead of the |
100 | bio chain. */ | |
101 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
6cc77e9c CH |
102 | /* The per-zone write lock is held for this request */ |
103 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) | |
76a86f9d | 104 | /* already slept for hybrid poll */ |
12f5b931 | 105 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) |
da661267 CH |
106 | /* ->timeout has been called, don't expire again */ |
107 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) | |
e8064021 CH |
108 | |
109 | /* flags that prevent us from merging requests: */ | |
110 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 111 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 112 | |
12f5b931 KB |
113 | /* |
114 | * Request state for blk-mq. | |
115 | */ | |
116 | enum mq_rq_state { | |
117 | MQ_RQ_IDLE = 0, | |
118 | MQ_RQ_IN_FLIGHT = 1, | |
119 | MQ_RQ_COMPLETE = 2, | |
120 | }; | |
121 | ||
1da177e4 | 122 | /* |
af76e555 CH |
123 | * Try to put the fields that are referenced together in the same cacheline. |
124 | * | |
125 | * If you modify this structure, make sure to update blk_rq_init() and | |
126 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
127 | */ |
128 | struct request { | |
165125e1 | 129 | struct request_queue *q; |
320ae51f | 130 | struct blk_mq_ctx *mq_ctx; |
ea4f995e | 131 | struct blk_mq_hw_ctx *mq_hctx; |
e6a1c874 | 132 | |
ef295ecf | 133 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 134 | req_flags_t rq_flags; |
d486f1f2 | 135 | |
2f578aaf | 136 | int tag; |
d486f1f2 JA |
137 | int internal_tag; |
138 | ||
a2dec7b3 | 139 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 140 | unsigned int __data_len; /* total data len */ |
181fdde3 | 141 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
142 | |
143 | struct bio *bio; | |
144 | struct bio *biotail; | |
145 | ||
7c3fb70f JA |
146 | struct list_head queuelist; |
147 | ||
360f92c2 JA |
148 | /* |
149 | * The hash is used inside the scheduler, and killed once the | |
150 | * request reaches the dispatch list. The ipi_list is only used | |
151 | * to queue the request for softirq completion, which is long | |
152 | * after the request has been unhashed (and even removed from | |
153 | * the dispatch list). | |
154 | */ | |
155 | union { | |
156 | struct hlist_node hash; /* merge hash */ | |
157 | struct list_head ipi_list; | |
158 | }; | |
159 | ||
e6a1c874 JA |
160 | /* |
161 | * The rb_node is only used inside the io scheduler, requests | |
162 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 163 | * completion_data share space with the rb_node. |
e6a1c874 JA |
164 | */ |
165 | union { | |
166 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 167 | struct bio_vec special_vec; |
c186794d | 168 | void *completion_data; |
e26738e0 | 169 | int error_count; /* for legacy drivers, don't use */ |
e6a1c874 | 170 | }; |
9817064b | 171 | |
ff7d145f | 172 | /* |
7f1dc8a2 | 173 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
174 | * more they have to dynamically allocate it. Flush requests are |
175 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 176 | * space with the elevator data. |
ff7d145f | 177 | */ |
c186794d | 178 | union { |
a612fddf TH |
179 | struct { |
180 | struct io_cq *icq; | |
181 | void *priv[2]; | |
182 | } elv; | |
183 | ||
c186794d MS |
184 | struct { |
185 | unsigned int seq; | |
186 | struct list_head list; | |
4853abaa | 187 | rq_end_io_fn *saved_end_io; |
c186794d MS |
188 | } flush; |
189 | }; | |
ff7d145f | 190 | |
8f34ee75 | 191 | struct gendisk *rq_disk; |
09e099d4 | 192 | struct hd_struct *part; |
6f816b4b TH |
193 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
194 | /* Time that the first bio started allocating this request. */ | |
195 | u64 alloc_time_ns; | |
196 | #endif | |
197 | /* Time that this request was allocated for this IO. */ | |
522a7775 | 198 | u64 start_time_ns; |
544ccc8d OS |
199 | /* Time that I/O was submitted to the device. */ |
200 | u64 io_start_time_ns; | |
201 | ||
202 | #ifdef CONFIG_BLK_WBT | |
203 | unsigned short wbt_flags; | |
204 | #endif | |
3d244306 HT |
205 | /* |
206 | * rq sectors used for blk stats. It has the same value | |
207 | * with blk_rq_sectors(rq), except that it never be zeroed | |
208 | * by completion. | |
209 | */ | |
210 | unsigned short stats_sectors; | |
544ccc8d OS |
211 | |
212 | /* | |
213 | * Number of scatter-gather DMA addr+len pairs after | |
1da177e4 LT |
214 | * physical address coalescing is performed. |
215 | */ | |
216 | unsigned short nr_phys_segments; | |
7c3fb70f | 217 | |
13f05c8d MP |
218 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
219 | unsigned short nr_integrity_segments; | |
220 | #endif | |
1da177e4 | 221 | |
a892c8d5 ST |
222 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
223 | struct bio_crypt_ctx *crypt_ctx; | |
224 | struct blk_ksm_keyslot *crypt_keyslot; | |
225 | #endif | |
226 | ||
7c3fb70f | 227 | unsigned short write_hint; |
8f34ee75 JA |
228 | unsigned short ioprio; |
229 | ||
12f5b931 KB |
230 | enum mq_rq_state state; |
231 | refcount_t ref; | |
1d9bd516 | 232 | |
0b7576d8 | 233 | unsigned int timeout; |
079076b3 | 234 | unsigned long deadline; |
cb6934f8 | 235 | |
7c3fb70f | 236 | union { |
0a4b6e2f | 237 | struct __call_single_data csd; |
7c3fb70f JA |
238 | u64 fifo_time; |
239 | }; | |
240 | ||
1da177e4 | 241 | /* |
c00895ab | 242 | * completion callback. |
1da177e4 LT |
243 | */ |
244 | rq_end_io_fn *end_io; | |
245 | void *end_io_data; | |
246 | }; | |
247 | ||
14cb0dc6 ML |
248 | static inline bool blk_op_is_scsi(unsigned int op) |
249 | { | |
250 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; | |
251 | } | |
252 | ||
253 | static inline bool blk_op_is_private(unsigned int op) | |
254 | { | |
255 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; | |
256 | } | |
257 | ||
aebf526b CH |
258 | static inline bool blk_rq_is_scsi(struct request *rq) |
259 | { | |
14cb0dc6 | 260 | return blk_op_is_scsi(req_op(rq)); |
aebf526b CH |
261 | } |
262 | ||
263 | static inline bool blk_rq_is_private(struct request *rq) | |
264 | { | |
14cb0dc6 | 265 | return blk_op_is_private(req_op(rq)); |
aebf526b CH |
266 | } |
267 | ||
57292b58 CH |
268 | static inline bool blk_rq_is_passthrough(struct request *rq) |
269 | { | |
aebf526b | 270 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
271 | } |
272 | ||
14cb0dc6 ML |
273 | static inline bool bio_is_passthrough(struct bio *bio) |
274 | { | |
275 | unsigned op = bio_op(bio); | |
276 | ||
277 | return blk_op_is_scsi(op) || blk_op_is_private(op); | |
278 | } | |
279 | ||
766ca442 FLVC |
280 | static inline unsigned short req_get_ioprio(struct request *req) |
281 | { | |
282 | return req->ioprio; | |
283 | } | |
284 | ||
1da177e4 LT |
285 | #include <linux/elevator.h> |
286 | ||
320ae51f JA |
287 | struct blk_queue_ctx; |
288 | ||
1da177e4 | 289 | struct bio_vec; |
1da177e4 | 290 | |
242f9dcb | 291 | enum blk_eh_timer_return { |
88b0cfad CH |
292 | BLK_EH_DONE, /* drivers has completed the command */ |
293 | BLK_EH_RESET_TIMER, /* reset timer and try again */ | |
242f9dcb JA |
294 | }; |
295 | ||
1da177e4 LT |
296 | enum blk_queue_state { |
297 | Queue_down, | |
298 | Queue_up, | |
299 | }; | |
300 | ||
ee1b6f7a SL |
301 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
302 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 303 | |
abf54393 FT |
304 | #define BLK_SCSI_MAX_CMDS (256) |
305 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
306 | ||
797476b8 DLM |
307 | /* |
308 | * Zoned block device models (zoned limit). | |
309 | */ | |
310 | enum blk_zoned_model { | |
311 | BLK_ZONED_NONE, /* Regular block device */ | |
312 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
313 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
314 | }; | |
315 | ||
025146e1 MP |
316 | struct queue_limits { |
317 | unsigned long bounce_pfn; | |
318 | unsigned long seg_boundary_mask; | |
03100aad | 319 | unsigned long virt_boundary_mask; |
025146e1 MP |
320 | |
321 | unsigned int max_hw_sectors; | |
ca369d51 | 322 | unsigned int max_dev_sectors; |
762380ad | 323 | unsigned int chunk_sectors; |
025146e1 MP |
324 | unsigned int max_sectors; |
325 | unsigned int max_segment_size; | |
c72758f3 | 326 | unsigned int physical_block_size; |
ad6bf88a | 327 | unsigned int logical_block_size; |
c72758f3 MP |
328 | unsigned int alignment_offset; |
329 | unsigned int io_min; | |
330 | unsigned int io_opt; | |
67efc925 | 331 | unsigned int max_discard_sectors; |
0034af03 | 332 | unsigned int max_hw_discard_sectors; |
4363ac7c | 333 | unsigned int max_write_same_sectors; |
a6f0788e | 334 | unsigned int max_write_zeroes_sectors; |
0512a75b | 335 | unsigned int max_zone_append_sectors; |
86b37281 MP |
336 | unsigned int discard_granularity; |
337 | unsigned int discard_alignment; | |
025146e1 | 338 | |
8a78362c | 339 | unsigned short max_segments; |
13f05c8d | 340 | unsigned short max_integrity_segments; |
1e739730 | 341 | unsigned short max_discard_segments; |
025146e1 | 342 | |
c72758f3 | 343 | unsigned char misaligned; |
86b37281 | 344 | unsigned char discard_misaligned; |
c78afc62 | 345 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 346 | enum blk_zoned_model zoned; |
025146e1 MP |
347 | }; |
348 | ||
d4100351 CH |
349 | typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, |
350 | void *data); | |
351 | ||
6a0cb1bc HR |
352 | #ifdef CONFIG_BLK_DEV_ZONED |
353 | ||
d4100351 CH |
354 | #define BLK_ALL_ZONES ((unsigned int)-1) |
355 | int blkdev_report_zones(struct block_device *bdev, sector_t sector, | |
356 | unsigned int nr_zones, report_zones_cb cb, void *data); | |
9b38bb4b | 357 | unsigned int blkdev_nr_zones(struct gendisk *disk); |
6c1b1da5 AJ |
358 | extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, |
359 | sector_t sectors, sector_t nr_sectors, | |
360 | gfp_t gfp_mask); | |
e732671a DLM |
361 | int blk_revalidate_disk_zones(struct gendisk *disk, |
362 | void (*update_driver_data)(struct gendisk *disk)); | |
6a0cb1bc | 363 | |
3ed05a98 ST |
364 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
365 | unsigned int cmd, unsigned long arg); | |
e876df1f AJ |
366 | extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, |
367 | unsigned int cmd, unsigned long arg); | |
3ed05a98 ST |
368 | |
369 | #else /* CONFIG_BLK_DEV_ZONED */ | |
370 | ||
9b38bb4b | 371 | static inline unsigned int blkdev_nr_zones(struct gendisk *disk) |
a91e1380 DLM |
372 | { |
373 | return 0; | |
374 | } | |
bf505456 | 375 | |
3ed05a98 ST |
376 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, |
377 | fmode_t mode, unsigned int cmd, | |
378 | unsigned long arg) | |
379 | { | |
380 | return -ENOTTY; | |
381 | } | |
382 | ||
e876df1f AJ |
383 | static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, |
384 | fmode_t mode, unsigned int cmd, | |
385 | unsigned long arg) | |
3ed05a98 ST |
386 | { |
387 | return -ENOTTY; | |
388 | } | |
389 | ||
6a0cb1bc HR |
390 | #endif /* CONFIG_BLK_DEV_ZONED */ |
391 | ||
d7b76301 | 392 | struct request_queue { |
1da177e4 | 393 | struct request *last_merge; |
b374d18a | 394 | struct elevator_queue *elevator; |
1da177e4 | 395 | |
34dbad5d | 396 | struct blk_queue_stats *stats; |
a7905043 | 397 | struct rq_qos *rq_qos; |
87760e5e | 398 | |
f8a5b122 | 399 | const struct blk_mq_ops *mq_ops; |
320ae51f | 400 | |
320ae51f | 401 | /* sw queues */ |
e6cdb092 | 402 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f | 403 | |
d278d4a8 JA |
404 | unsigned int queue_depth; |
405 | ||
320ae51f JA |
406 | /* hw dispatch queues */ |
407 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
408 | unsigned int nr_hw_queues; | |
409 | ||
dc3b17cc | 410 | struct backing_dev_info *backing_dev_info; |
1da177e4 LT |
411 | |
412 | /* | |
413 | * The queue owner gets to use this for whatever they like. | |
414 | * ll_rw_blk doesn't touch it. | |
415 | */ | |
416 | void *queuedata; | |
417 | ||
1da177e4 | 418 | /* |
d7b76301 | 419 | * various queue flags, see QUEUE_* below |
1da177e4 | 420 | */ |
d7b76301 | 421 | unsigned long queue_flags; |
cd84a62e BVA |
422 | /* |
423 | * Number of contexts that have called blk_set_pm_only(). If this | |
424 | * counter is above zero then only RQF_PM and RQF_PREEMPT requests are | |
425 | * processed. | |
426 | */ | |
427 | atomic_t pm_only; | |
1da177e4 | 428 | |
a73f730d TH |
429 | /* |
430 | * ida allocated id for this queue. Used to index queues from | |
431 | * ioctx. | |
432 | */ | |
433 | int id; | |
434 | ||
1da177e4 | 435 | /* |
d7b76301 | 436 | * queue needs bounce pages for pages above this limit |
1da177e4 | 437 | */ |
d7b76301 | 438 | gfp_t bounce_gfp; |
1da177e4 | 439 | |
0d945c1f | 440 | spinlock_t queue_lock; |
1da177e4 LT |
441 | |
442 | /* | |
443 | * queue kobject | |
444 | */ | |
445 | struct kobject kobj; | |
446 | ||
320ae51f JA |
447 | /* |
448 | * mq queue kobject | |
449 | */ | |
1db4909e | 450 | struct kobject *mq_kobj; |
320ae51f | 451 | |
ac6fc48c DW |
452 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
453 | struct blk_integrity integrity; | |
454 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
455 | ||
47fafbc7 | 456 | #ifdef CONFIG_PM |
6c954667 LM |
457 | struct device *dev; |
458 | int rpm_status; | |
459 | unsigned int nr_pending; | |
460 | #endif | |
461 | ||
1da177e4 LT |
462 | /* |
463 | * queue settings | |
464 | */ | |
465 | unsigned long nr_requests; /* Max # of requests */ | |
1da177e4 | 466 | |
e3790c7d | 467 | unsigned int dma_pad_mask; |
1da177e4 LT |
468 | unsigned int dma_alignment; |
469 | ||
1b262839 ST |
470 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
471 | /* Inline crypto capabilities */ | |
472 | struct blk_keyslot_manager *ksm; | |
473 | #endif | |
474 | ||
242f9dcb | 475 | unsigned int rq_timeout; |
64f1c21e | 476 | int poll_nsec; |
34dbad5d OS |
477 | |
478 | struct blk_stat_callback *poll_cb; | |
0206319f | 479 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
34dbad5d | 480 | |
242f9dcb | 481 | struct timer_list timeout; |
287922eb | 482 | struct work_struct timeout_work; |
242f9dcb | 483 | |
a612fddf | 484 | struct list_head icq_list; |
4eef3049 | 485 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 486 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 487 | struct blkcg_gq *root_blkg; |
03aa264a | 488 | struct list_head blkg_list; |
4eef3049 | 489 | #endif |
a612fddf | 490 | |
025146e1 MP |
491 | struct queue_limits limits; |
492 | ||
68c43f13 DLM |
493 | unsigned int required_elevator_features; |
494 | ||
6a5ac984 | 495 | #ifdef CONFIG_BLK_DEV_ZONED |
6cc77e9c CH |
496 | /* |
497 | * Zoned block device information for request dispatch control. | |
498 | * nr_zones is the total number of zones of the device. This is always | |
f216fdd7 CH |
499 | * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones |
500 | * bits which indicates if a zone is conventional (bit set) or | |
501 | * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones | |
6cc77e9c CH |
502 | * bits which indicates if a zone is write locked, that is, if a write |
503 | * request targeting the zone was dispatched. All three fields are | |
504 | * initialized by the low level device driver (e.g. scsi/sd.c). | |
505 | * Stacking drivers (device mappers) may or may not initialize | |
506 | * these fields. | |
ccce20fc BVA |
507 | * |
508 | * Reads of this information must be protected with blk_queue_enter() / | |
509 | * blk_queue_exit(). Modifying this information is only allowed while | |
510 | * no requests are being processed. See also blk_mq_freeze_queue() and | |
511 | * blk_mq_unfreeze_queue(). | |
6cc77e9c CH |
512 | */ |
513 | unsigned int nr_zones; | |
f216fdd7 | 514 | unsigned long *conv_zones_bitmap; |
6cc77e9c | 515 | unsigned long *seq_zones_wlock; |
6a5ac984 | 516 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 517 | |
1da177e4 LT |
518 | /* |
519 | * sg stuff | |
520 | */ | |
521 | unsigned int sg_timeout; | |
522 | unsigned int sg_reserved_size; | |
1946089a | 523 | int node; |
85e0cbbb | 524 | struct mutex debugfs_mutex; |
6c5c9341 | 525 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
c780e86d | 526 | struct blk_trace __rcu *blk_trace; |
6c5c9341 | 527 | #endif |
1da177e4 | 528 | /* |
4913efe4 | 529 | * for flush operations |
1da177e4 | 530 | */ |
7c94e1c1 | 531 | struct blk_flush_queue *fq; |
483f4afc | 532 | |
6fca6a61 CH |
533 | struct list_head requeue_list; |
534 | spinlock_t requeue_lock; | |
2849450a | 535 | struct delayed_work requeue_work; |
6fca6a61 | 536 | |
483f4afc | 537 | struct mutex sysfs_lock; |
cecf5d87 | 538 | struct mutex sysfs_dir_lock; |
d351af01 | 539 | |
2f8f1336 ML |
540 | /* |
541 | * for reusing dead hctx instance in case of updating | |
542 | * nr_hw_queues | |
543 | */ | |
544 | struct list_head unused_hctx_list; | |
545 | spinlock_t unused_hctx_lock; | |
546 | ||
7996a8b5 | 547 | int mq_freeze_depth; |
d732580b | 548 | |
d351af01 FT |
549 | #if defined(CONFIG_BLK_DEV_BSG) |
550 | struct bsg_class_device bsg_dev; | |
551 | #endif | |
e43473b7 VG |
552 | |
553 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
554 | /* Throttle data */ | |
555 | struct throtl_data *td; | |
556 | #endif | |
548bc8e1 | 557 | struct rcu_head rcu_head; |
320ae51f | 558 | wait_queue_head_t mq_freeze_wq; |
7996a8b5 BL |
559 | /* |
560 | * Protect concurrent access to q_usage_counter by | |
561 | * percpu_ref_kill() and percpu_ref_reinit(). | |
562 | */ | |
563 | struct mutex mq_freeze_lock; | |
3ef28e83 | 564 | struct percpu_ref q_usage_counter; |
0d2602ca JA |
565 | |
566 | struct blk_mq_tag_set *tag_set; | |
567 | struct list_head tag_set_list; | |
338aa96d | 568 | struct bio_set bio_split; |
4593fdbe | 569 | |
07e4fead | 570 | struct dentry *debugfs_dir; |
85e0cbbb LC |
571 | |
572 | #ifdef CONFIG_BLK_DEBUG_FS | |
d332ce09 | 573 | struct dentry *sched_debugfs_dir; |
cc56694f | 574 | struct dentry *rqos_debugfs_dir; |
07e4fead OS |
575 | #endif |
576 | ||
4593fdbe | 577 | bool mq_sysfs_init_done; |
6d247d7f CH |
578 | |
579 | size_t cmd_size; | |
dc9edc44 | 580 | |
f793dfd3 JA |
581 | #define BLK_MAX_WRITE_HINTS 5 |
582 | u64 write_hints[BLK_MAX_WRITE_HINTS]; | |
1da177e4 LT |
583 | }; |
584 | ||
eca7abf3 JA |
585 | #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ |
586 | #define QUEUE_FLAG_DYING 1 /* queue being torn down */ | |
eca7abf3 JA |
587 | #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ |
588 | #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ | |
589 | #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ | |
590 | #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ | |
591 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ | |
592 | #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ | |
593 | #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ | |
594 | #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ | |
595 | #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ | |
596 | #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ | |
597 | #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ | |
598 | #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ | |
599 | #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ | |
eca7abf3 JA |
600 | #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ |
601 | #define QUEUE_FLAG_WC 17 /* Write back caching */ | |
602 | #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ | |
603 | #define QUEUE_FLAG_DAX 19 /* device supports DAX */ | |
604 | #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ | |
605 | #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ | |
606 | #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ | |
607 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ | |
608 | #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ | |
609 | #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ | |
e84e8f06 | 610 | #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ |
6f816b4b | 611 | #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ |
797e7dbb | 612 | |
94eddfbe | 613 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
6e0de611 | 614 | (1 << QUEUE_FLAG_SAME_COMP)) |
94eddfbe | 615 | |
8814ce8a BVA |
616 | void blk_queue_flag_set(unsigned int flag, struct request_queue *q); |
617 | void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); | |
618 | bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); | |
8814ce8a | 619 | |
1da177e4 | 620 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) |
3f3299d5 | 621 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 622 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
320ae51f | 623 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 624 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
625 | #define blk_queue_noxmerges(q) \ |
626 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 627 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 628 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 629 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
c15227de | 630 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
e84e8f06 CK |
631 | #define blk_queue_zone_resetall(q) \ |
632 | test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) | |
288dab8a CH |
633 | #define blk_queue_secure_erase(q) \ |
634 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 635 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
9efc160f BVA |
636 | #define blk_queue_scsi_passthrough(q) \ |
637 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) | |
49d92c0d LG |
638 | #define blk_queue_pci_p2pdma(q) \ |
639 | test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) | |
6f816b4b TH |
640 | #ifdef CONFIG_BLK_RQ_ALLOC_TIME |
641 | #define blk_queue_rq_alloc_time(q) \ | |
642 | test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) | |
643 | #else | |
644 | #define blk_queue_rq_alloc_time(q) false | |
645 | #endif | |
1da177e4 | 646 | |
33659ebb CH |
647 | #define blk_noretry_request(rq) \ |
648 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
649 | REQ_FAILFAST_DRIVER)) | |
f4560ffe | 650 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
cd84a62e | 651 | #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) |
0ce91444 | 652 | #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) |
58c898ba | 653 | #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) |
c9254f2d | 654 | |
cd84a62e BVA |
655 | extern void blk_set_pm_only(struct request_queue *q); |
656 | extern void blk_clear_pm_only(struct request_queue *q); | |
33659ebb | 657 | |
57292b58 CH |
658 | static inline bool blk_account_rq(struct request *rq) |
659 | { | |
660 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
661 | } | |
33659ebb | 662 | |
1da177e4 LT |
663 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) |
664 | ||
4e1b2d52 | 665 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 666 | |
9d9de535 CH |
667 | #define rq_dma_dir(rq) \ |
668 | (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) | |
669 | ||
3ab3a031 CH |
670 | #define dma_map_bvec(dev, bv, dir, attrs) \ |
671 | dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ | |
672 | (dir), (attrs)) | |
673 | ||
344e9ffc | 674 | static inline bool queue_is_mq(struct request_queue *q) |
49fd524f | 675 | { |
a1ce35fa | 676 | return q->mq_ops; |
49fd524f JA |
677 | } |
678 | ||
797476b8 DLM |
679 | static inline enum blk_zoned_model |
680 | blk_queue_zoned_model(struct request_queue *q) | |
681 | { | |
682 | return q->limits.zoned; | |
683 | } | |
684 | ||
685 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
686 | { | |
687 | switch (blk_queue_zoned_model(q)) { | |
688 | case BLK_ZONED_HA: | |
689 | case BLK_ZONED_HM: | |
690 | return true; | |
691 | default: | |
692 | return false; | |
693 | } | |
694 | } | |
695 | ||
113ab72e | 696 | static inline sector_t blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
697 | { |
698 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
699 | } | |
700 | ||
6a5ac984 | 701 | #ifdef CONFIG_BLK_DEV_ZONED |
965b652e DLM |
702 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
703 | { | |
704 | return blk_queue_is_zoned(q) ? q->nr_zones : 0; | |
705 | } | |
706 | ||
6cc77e9c CH |
707 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
708 | sector_t sector) | |
709 | { | |
710 | if (!blk_queue_is_zoned(q)) | |
711 | return 0; | |
712 | return sector >> ilog2(q->limits.chunk_sectors); | |
713 | } | |
714 | ||
715 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, | |
716 | sector_t sector) | |
717 | { | |
f216fdd7 | 718 | if (!blk_queue_is_zoned(q)) |
6cc77e9c | 719 | return false; |
f216fdd7 CH |
720 | if (!q->conv_zones_bitmap) |
721 | return true; | |
722 | return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); | |
6cc77e9c | 723 | } |
965b652e DLM |
724 | #else /* CONFIG_BLK_DEV_ZONED */ |
725 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) | |
726 | { | |
727 | return 0; | |
728 | } | |
02992df8 JT |
729 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, |
730 | sector_t sector) | |
731 | { | |
732 | return false; | |
733 | } | |
734 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, | |
735 | sector_t sector) | |
736 | { | |
737 | return 0; | |
738 | } | |
6a5ac984 | 739 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 740 | |
1faa16d2 JA |
741 | static inline bool rq_is_sync(struct request *rq) |
742 | { | |
ef295ecf | 743 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
744 | } |
745 | ||
e2a60da7 MP |
746 | static inline bool rq_mergeable(struct request *rq) |
747 | { | |
57292b58 | 748 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 749 | return false; |
1da177e4 | 750 | |
3a5e02ce MC |
751 | if (req_op(rq) == REQ_OP_FLUSH) |
752 | return false; | |
753 | ||
a6f0788e CK |
754 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
755 | return false; | |
756 | ||
0512a75b KB |
757 | if (req_op(rq) == REQ_OP_ZONE_APPEND) |
758 | return false; | |
759 | ||
e2a60da7 | 760 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
761 | return false; |
762 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
763 | return false; |
764 | ||
765 | return true; | |
766 | } | |
1da177e4 | 767 | |
4363ac7c MP |
768 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
769 | { | |
efbeccdb CH |
770 | if (bio_page(a) == bio_page(b) && |
771 | bio_offset(a) == bio_offset(b)) | |
4363ac7c MP |
772 | return true; |
773 | ||
774 | return false; | |
775 | } | |
776 | ||
d278d4a8 JA |
777 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
778 | { | |
779 | if (q->queue_depth) | |
780 | return q->queue_depth; | |
781 | ||
782 | return q->nr_requests; | |
783 | } | |
784 | ||
1da177e4 LT |
785 | extern unsigned long blk_max_low_pfn, blk_max_pfn; |
786 | ||
787 | /* | |
788 | * standard bounce addresses: | |
789 | * | |
790 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
791 | * BLK_BOUNCE_ANY : don't bounce anything | |
792 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
793 | */ | |
2472892a AK |
794 | |
795 | #if BITS_PER_LONG == 32 | |
1da177e4 | 796 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
797 | #else |
798 | #define BLK_BOUNCE_HIGH -1ULL | |
799 | #endif | |
800 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 801 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 802 | |
3d6392cf JA |
803 | /* |
804 | * default timeout for SG_IO if none specified | |
805 | */ | |
806 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 807 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 808 | |
152e283f FT |
809 | struct rq_map_data { |
810 | struct page **pages; | |
811 | int page_order; | |
812 | int nr_entries; | |
56c451f4 | 813 | unsigned long offset; |
97ae77a1 | 814 | int null_mapped; |
ecb554a8 | 815 | int from_user; |
152e283f FT |
816 | }; |
817 | ||
5705f702 | 818 | struct req_iterator { |
7988613b | 819 | struct bvec_iter iter; |
5705f702 N |
820 | struct bio *bio; |
821 | }; | |
822 | ||
823 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
824 | #define for_each_bio(_bio) \ |
825 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 826 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
827 | if ((rq->bio)) \ |
828 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
829 | ||
5705f702 N |
830 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
831 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 832 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 833 | |
d18d9174 ML |
834 | #define rq_for_each_bvec(bvl, _rq, _iter) \ |
835 | __rq_for_each_bio(_iter.bio, _rq) \ | |
836 | bio_for_each_bvec(bvl, _iter.bio, _iter.iter) | |
837 | ||
4550dd6c | 838 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 839 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 840 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 841 | |
2d4dc890 IL |
842 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
843 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
844 | #endif | |
845 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
846 | extern void rq_flush_dcache_pages(struct request *rq); | |
847 | #else | |
848 | static inline void rq_flush_dcache_pages(struct request *rq) | |
849 | { | |
850 | } | |
851 | #endif | |
852 | ||
1da177e4 LT |
853 | extern int blk_register_queue(struct gendisk *disk); |
854 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 855 | extern blk_qc_t generic_make_request(struct bio *bio); |
f421e1d9 | 856 | extern blk_qc_t direct_make_request(struct bio *bio); |
2a4aa30c | 857 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 858 | extern void blk_put_request(struct request *); |
cd6ce148 | 859 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
ff005a06 | 860 | blk_mq_req_flags_t flags); |
ef9e3fac | 861 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
862 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
863 | struct bio_set *bs, gfp_t gfp_mask, | |
864 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
865 | void *data); | |
866 | extern void blk_rq_unprep_clone(struct request *rq); | |
2a842aca | 867 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
82124d60 | 868 | struct request *rq); |
0abc2a10 | 869 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
f695ca38 | 870 | extern void blk_queue_split(struct bio **); |
0bfc96cb | 871 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
872 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
873 | unsigned int, void __user *); | |
74f3c8af AV |
874 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
875 | unsigned int, void __user *); | |
e915e872 AV |
876 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
877 | struct scsi_ioctl_command __user *); | |
98aaaec4 AB |
878 | extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); |
879 | extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); | |
3fcfab16 | 880 | |
9a95e4ef | 881 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
2e6edc95 | 882 | extern void blk_queue_exit(struct request_queue *q); |
1da177e4 | 883 | extern void blk_sync_queue(struct request_queue *q); |
a3bce90e | 884 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
885 | struct rq_map_data *, void __user *, unsigned long, |
886 | gfp_t); | |
8e5cfc45 | 887 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
888 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
889 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
890 | struct rq_map_data *, const struct iov_iter *, |
891 | gfp_t); | |
b7819b92 | 892 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 893 | struct request *, int); |
165125e1 | 894 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 895 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 896 | |
e47bc4ed CK |
897 | /* Helper to convert REQ_OP_XXX to its string format XXX */ |
898 | extern const char *blk_op_str(unsigned int op); | |
899 | ||
2a842aca CH |
900 | int blk_status_to_errno(blk_status_t status); |
901 | blk_status_t errno_to_blk_status(int errno); | |
902 | ||
0a1b8b87 | 903 | int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); |
05229bee | 904 | |
165125e1 | 905 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 906 | { |
ff9ea323 | 907 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
908 | } |
909 | ||
233bde21 BVA |
910 | /* |
911 | * The basic unit of block I/O is a sector. It is used in a number of contexts | |
912 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 | |
913 | * bytes. Variables of type sector_t represent an offset or size that is a | |
914 | * multiple of 512 bytes. Hence these two constants. | |
915 | */ | |
916 | #ifndef SECTOR_SHIFT | |
917 | #define SECTOR_SHIFT 9 | |
918 | #endif | |
919 | #ifndef SECTOR_SIZE | |
920 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) | |
921 | #endif | |
922 | ||
5efccd17 | 923 | /* |
80a761fd TH |
924 | * blk_rq_pos() : the current sector |
925 | * blk_rq_bytes() : bytes left in the entire request | |
926 | * blk_rq_cur_bytes() : bytes left in the current segment | |
927 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
928 | * blk_rq_sectors() : sectors left in the entire request | |
929 | * blk_rq_cur_sectors() : sectors left in the current segment | |
3d244306 | 930 | * blk_rq_stats_sectors() : sectors of the entire request used for stats |
5efccd17 | 931 | */ |
5b93629b TH |
932 | static inline sector_t blk_rq_pos(const struct request *rq) |
933 | { | |
a2dec7b3 | 934 | return rq->__sector; |
2e46e8b2 TH |
935 | } |
936 | ||
937 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
938 | { | |
a2dec7b3 | 939 | return rq->__data_len; |
5b93629b TH |
940 | } |
941 | ||
2e46e8b2 TH |
942 | static inline int blk_rq_cur_bytes(const struct request *rq) |
943 | { | |
944 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
945 | } | |
5efccd17 | 946 | |
80a761fd TH |
947 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
948 | ||
5b93629b TH |
949 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
950 | { | |
233bde21 | 951 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
952 | } |
953 | ||
954 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
955 | { | |
233bde21 | 956 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
957 | } |
958 | ||
3d244306 HT |
959 | static inline unsigned int blk_rq_stats_sectors(const struct request *rq) |
960 | { | |
961 | return rq->stats_sectors; | |
962 | } | |
963 | ||
6a5ac984 | 964 | #ifdef CONFIG_BLK_DEV_ZONED |
02694e86 CK |
965 | |
966 | /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ | |
967 | const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); | |
968 | ||
6cc77e9c CH |
969 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
970 | { | |
971 | return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); | |
972 | } | |
973 | ||
974 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) | |
975 | { | |
976 | return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); | |
977 | } | |
6a5ac984 | 978 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 979 | |
2e3258ec CH |
980 | /* |
981 | * Some commands like WRITE SAME have a payload or data transfer size which | |
982 | * is different from the size of the request. Any driver that supports such | |
983 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
984 | * calculate the data transfer size. | |
985 | */ | |
986 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
987 | { | |
988 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
989 | return rq->special_vec.bv_len; | |
990 | return blk_rq_bytes(rq); | |
991 | } | |
992 | ||
3aef3cae CH |
993 | /* |
994 | * Return the first full biovec in the request. The caller needs to check that | |
995 | * there are any bvecs before calling this helper. | |
996 | */ | |
997 | static inline struct bio_vec req_bvec(struct request *rq) | |
998 | { | |
999 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1000 | return rq->special_vec; | |
1001 | return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); | |
1002 | } | |
1003 | ||
f31dc1cd | 1004 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 1005 | int op) |
f31dc1cd | 1006 | { |
7afafc8a | 1007 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
233bde21 BVA |
1008 | return min(q->limits.max_discard_sectors, |
1009 | UINT_MAX >> SECTOR_SHIFT); | |
f31dc1cd | 1010 | |
8fe0d473 | 1011 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1012 | return q->limits.max_write_same_sectors; |
1013 | ||
a6f0788e CK |
1014 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1015 | return q->limits.max_write_zeroes_sectors; | |
1016 | ||
f31dc1cd MP |
1017 | return q->limits.max_sectors; |
1018 | } | |
1019 | ||
762380ad JA |
1020 | /* |
1021 | * Return maximum size of a request at given offset. Only valid for | |
1022 | * file system requests. | |
1023 | */ | |
1024 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1025 | sector_t offset) | |
1026 | { | |
1027 | if (!q->limits.chunk_sectors) | |
736ed4de | 1028 | return q->limits.max_sectors; |
762380ad | 1029 | |
15bfd21f KB |
1030 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
1031 | (offset & (q->limits.chunk_sectors - 1)))); | |
762380ad JA |
1032 | } |
1033 | ||
17007f39 DLM |
1034 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1035 | sector_t offset) | |
f31dc1cd MP |
1036 | { |
1037 | struct request_queue *q = rq->q; | |
1038 | ||
57292b58 | 1039 | if (blk_rq_is_passthrough(rq)) |
f31dc1cd MP |
1040 | return q->limits.max_hw_sectors; |
1041 | ||
7afafc8a AH |
1042 | if (!q->limits.chunk_sectors || |
1043 | req_op(rq) == REQ_OP_DISCARD || | |
1044 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1045 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1046 | |
17007f39 | 1047 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1048 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1049 | } |
1050 | ||
75afb352 JN |
1051 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1052 | { | |
1053 | unsigned int nr_bios = 0; | |
1054 | struct bio *bio; | |
1055 | ||
1056 | __rq_for_each_bio(bio, rq) | |
1057 | nr_bios++; | |
1058 | ||
1059 | return nr_bios; | |
1060 | } | |
1061 | ||
ef71de8b CH |
1062 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1063 | ||
1da177e4 | 1064 | /* |
2e60e022 TH |
1065 | * Request completion related functions. |
1066 | * | |
1067 | * blk_update_request() completes given number of bytes and updates | |
1068 | * the request without completing it. | |
1da177e4 | 1069 | */ |
2a842aca | 1070 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
2e60e022 | 1071 | unsigned int nr_bytes); |
2e60e022 | 1072 | |
242f9dcb | 1073 | extern void blk_abort_request(struct request *); |
ff856bad | 1074 | |
1da177e4 LT |
1075 | /* |
1076 | * Access functions for manipulating queue properties | |
1077 | */ | |
165125e1 | 1078 | extern void blk_cleanup_queue(struct request_queue *); |
165125e1 | 1079 | extern void blk_queue_bounce_limit(struct request_queue *, u64); |
086fa5ff | 1080 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1081 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1082 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1e739730 CH |
1083 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1084 | unsigned short); | |
165125e1 | 1085 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1086 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1087 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1088 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1089 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1090 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1091 | unsigned int max_write_same_sectors); | |
ad6bf88a | 1092 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); |
0512a75b KB |
1093 | extern void blk_queue_max_zone_append_sectors(struct request_queue *q, |
1094 | unsigned int max_zone_append_sectors); | |
892b6f90 | 1095 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1096 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1097 | unsigned int alignment); | |
7c958e32 | 1098 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1099 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1100 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1101 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1102 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1103 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1104 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1105 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1106 | sector_t offset); | |
17be8c24 MP |
1107 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1108 | sector_t offset); | |
c72758f3 MP |
1109 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1110 | sector_t offset); | |
165125e1 | 1111 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
27f8221a | 1112 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
165125e1 | 1113 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1114 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1115 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1116 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
242f9dcb | 1117 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
93e9d8e8 | 1118 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
68c43f13 DLM |
1119 | extern void blk_queue_required_elevator_features(struct request_queue *q, |
1120 | unsigned int features); | |
45147fb5 YS |
1121 | extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, |
1122 | struct device *dev); | |
1da177e4 | 1123 | |
1e739730 CH |
1124 | /* |
1125 | * Number of physical segments as sent to the device. | |
1126 | * | |
1127 | * Normally this is the number of discontiguous data segments sent by the | |
1128 | * submitter. But for data-less command like discard we might have no | |
1129 | * actual data segments submitted, but the driver might have to add it's | |
1130 | * own special payload. In that case we still return 1 here so that this | |
1131 | * special payload will be mapped. | |
1132 | */ | |
f9d03f96 CH |
1133 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1134 | { | |
1135 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1136 | return 1; | |
1137 | return rq->nr_phys_segments; | |
1138 | } | |
1139 | ||
1e739730 CH |
1140 | /* |
1141 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1142 | * Each discard bio merged into a request is counted as one segment. | |
1143 | */ | |
1144 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1145 | { | |
1146 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1147 | } | |
1148 | ||
89de1504 CH |
1149 | int __blk_rq_map_sg(struct request_queue *q, struct request *rq, |
1150 | struct scatterlist *sglist, struct scatterlist **last_sg); | |
1151 | static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, | |
1152 | struct scatterlist *sglist) | |
1153 | { | |
1154 | struct scatterlist *last_sg = NULL; | |
1155 | ||
1156 | return __blk_rq_map_sg(q, rq, sglist, &last_sg); | |
1157 | } | |
1da177e4 | 1158 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1159 | |
09ac46c4 | 1160 | bool __must_check blk_get_queue(struct request_queue *); |
c62b37d9 | 1161 | struct request_queue *blk_alloc_queue(int node_id); |
165125e1 | 1162 | extern void blk_put_queue(struct request_queue *); |
3f21c265 | 1163 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1164 | |
1a4dcfa8 | 1165 | #ifdef CONFIG_BLOCK |
316cc67d | 1166 | /* |
75df7136 SJ |
1167 | * blk_plug permits building a queue of related requests by holding the I/O |
1168 | * fragments for a short period. This allows merging of sequential requests | |
1169 | * into single larger request. As the requests are moved from a per-task list to | |
1170 | * the device's request_queue in a batch, this results in improved scalability | |
1171 | * as the lock contention for request_queue lock is reduced. | |
1172 | * | |
1173 | * It is ok not to disable preemption when adding the request to the plug list | |
1174 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1175 | * the plug list when the task sleeps by itself. For details, please see | |
1176 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1177 | */ |
73c10101 | 1178 | struct blk_plug { |
320ae51f | 1179 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1180 | struct list_head cb_list; /* md requires an unplug callback */ |
5f0ed774 | 1181 | unsigned short rq_count; |
ce5b009c | 1182 | bool multiple_queues; |
73c10101 | 1183 | }; |
55c022bb | 1184 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1185 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1186 | |
9cbb1750 | 1187 | struct blk_plug_cb; |
74018dc3 | 1188 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1189 | struct blk_plug_cb { |
1190 | struct list_head list; | |
9cbb1750 N |
1191 | blk_plug_cb_fn callback; |
1192 | void *data; | |
048c9374 | 1193 | }; |
9cbb1750 N |
1194 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1195 | void *data, int size); | |
73c10101 JA |
1196 | extern void blk_start_plug(struct blk_plug *); |
1197 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1198 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1199 | |
1200 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1201 | { | |
1202 | struct blk_plug *plug = tsk->plug; | |
1203 | ||
a237c1c5 JA |
1204 | if (plug) |
1205 | blk_flush_plug_list(plug, false); | |
1206 | } | |
1207 | ||
1208 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1209 | { | |
1210 | struct blk_plug *plug = tsk->plug; | |
1211 | ||
88b996cd | 1212 | if (plug) |
f6603783 | 1213 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1214 | } |
1215 | ||
1216 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1217 | { | |
1218 | struct blk_plug *plug = tsk->plug; | |
1219 | ||
320ae51f | 1220 | return plug && |
a1ce35fa | 1221 | (!list_empty(&plug->mq_list) || |
320ae51f | 1222 | !list_empty(&plug->cb_list)); |
73c10101 JA |
1223 | } |
1224 | ||
1a4dcfa8 CH |
1225 | int blkdev_issue_flush(struct block_device *, gfp_t); |
1226 | long nr_blockdev_pages(void); | |
1227 | #else /* CONFIG_BLOCK */ | |
1228 | struct blk_plug { | |
1229 | }; | |
1230 | ||
1231 | static inline void blk_start_plug(struct blk_plug *plug) | |
1232 | { | |
1233 | } | |
1234 | ||
1235 | static inline void blk_finish_plug(struct blk_plug *plug) | |
1236 | { | |
1237 | } | |
1238 | ||
1239 | static inline void blk_flush_plug(struct task_struct *task) | |
1240 | { | |
1241 | } | |
1242 | ||
1243 | static inline void blk_schedule_flush_plug(struct task_struct *task) | |
1244 | { | |
1245 | } | |
1246 | ||
1247 | ||
1248 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1249 | { | |
1250 | return false; | |
1251 | } | |
1252 | ||
1253 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask) | |
1254 | { | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | static inline long nr_blockdev_pages(void) | |
1259 | { | |
1260 | return 0; | |
1261 | } | |
1262 | #endif /* CONFIG_BLOCK */ | |
1263 | ||
71ac860a ML |
1264 | extern void blk_io_schedule(void); |
1265 | ||
ee472d83 CH |
1266 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1267 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e950fdf7 CH |
1268 | |
1269 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
dd3932ed | 1270 | |
fbd9b09a DM |
1271 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1272 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1273 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1274 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1275 | struct bio **biop); |
ee472d83 CH |
1276 | |
1277 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ | |
cb365b96 | 1278 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
ee472d83 | 1279 | |
e73c23ff CK |
1280 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1281 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 1282 | unsigned flags); |
3f14d792 | 1283 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 CH |
1284 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1285 | ||
2cf6d26a CH |
1286 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1287 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1288 | { |
233bde21 BVA |
1289 | return blkdev_issue_discard(sb->s_bdev, |
1290 | block << (sb->s_blocksize_bits - | |
1291 | SECTOR_SHIFT), | |
1292 | nr_blocks << (sb->s_blocksize_bits - | |
1293 | SECTOR_SHIFT), | |
2cf6d26a | 1294 | gfp_mask, flags); |
fb2dce86 | 1295 | } |
e6fa0be6 | 1296 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1297 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1298 | { |
1299 | return blkdev_issue_zeroout(sb->s_bdev, | |
233bde21 BVA |
1300 | block << (sb->s_blocksize_bits - |
1301 | SECTOR_SHIFT), | |
1302 | nr_blocks << (sb->s_blocksize_bits - | |
1303 | SECTOR_SHIFT), | |
ee472d83 | 1304 | gfp_mask, 0); |
e6fa0be6 | 1305 | } |
1da177e4 | 1306 | |
f00c4d80 | 1307 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
0b07de85 | 1308 | |
eb28d31b MP |
1309 | enum blk_default_limits { |
1310 | BLK_MAX_SEGMENTS = 128, | |
1311 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1312 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1313 | BLK_MAX_SEGMENT_SIZE = 65536, |
1314 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1315 | }; | |
0e435ac2 | 1316 | |
af2c68fe | 1317 | static inline unsigned long queue_segment_boundary(const struct request_queue *q) |
ae03bf63 | 1318 | { |
025146e1 | 1319 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1320 | } |
1321 | ||
af2c68fe | 1322 | static inline unsigned long queue_virt_boundary(const struct request_queue *q) |
03100aad KB |
1323 | { |
1324 | return q->limits.virt_boundary_mask; | |
1325 | } | |
1326 | ||
af2c68fe | 1327 | static inline unsigned int queue_max_sectors(const struct request_queue *q) |
ae03bf63 | 1328 | { |
025146e1 | 1329 | return q->limits.max_sectors; |
ae03bf63 MP |
1330 | } |
1331 | ||
af2c68fe | 1332 | static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) |
ae03bf63 | 1333 | { |
025146e1 | 1334 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1335 | } |
1336 | ||
af2c68fe | 1337 | static inline unsigned short queue_max_segments(const struct request_queue *q) |
ae03bf63 | 1338 | { |
8a78362c | 1339 | return q->limits.max_segments; |
ae03bf63 MP |
1340 | } |
1341 | ||
af2c68fe | 1342 | static inline unsigned short queue_max_discard_segments(const struct request_queue *q) |
1e739730 CH |
1343 | { |
1344 | return q->limits.max_discard_segments; | |
1345 | } | |
1346 | ||
af2c68fe | 1347 | static inline unsigned int queue_max_segment_size(const struct request_queue *q) |
ae03bf63 | 1348 | { |
025146e1 | 1349 | return q->limits.max_segment_size; |
ae03bf63 MP |
1350 | } |
1351 | ||
0512a75b KB |
1352 | static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) |
1353 | { | |
1354 | return q->limits.max_zone_append_sectors; | |
1355 | } | |
1356 | ||
ad6bf88a | 1357 | static inline unsigned queue_logical_block_size(const struct request_queue *q) |
1da177e4 LT |
1358 | { |
1359 | int retval = 512; | |
1360 | ||
025146e1 MP |
1361 | if (q && q->limits.logical_block_size) |
1362 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1363 | |
1364 | return retval; | |
1365 | } | |
1366 | ||
ad6bf88a | 1367 | static inline unsigned int bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1368 | { |
e1defc4f | 1369 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1370 | } |
1371 | ||
af2c68fe | 1372 | static inline unsigned int queue_physical_block_size(const struct request_queue *q) |
c72758f3 MP |
1373 | { |
1374 | return q->limits.physical_block_size; | |
1375 | } | |
1376 | ||
892b6f90 | 1377 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1378 | { |
1379 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1380 | } | |
1381 | ||
af2c68fe | 1382 | static inline unsigned int queue_io_min(const struct request_queue *q) |
c72758f3 MP |
1383 | { |
1384 | return q->limits.io_min; | |
1385 | } | |
1386 | ||
ac481c20 MP |
1387 | static inline int bdev_io_min(struct block_device *bdev) |
1388 | { | |
1389 | return queue_io_min(bdev_get_queue(bdev)); | |
1390 | } | |
1391 | ||
af2c68fe | 1392 | static inline unsigned int queue_io_opt(const struct request_queue *q) |
c72758f3 MP |
1393 | { |
1394 | return q->limits.io_opt; | |
1395 | } | |
1396 | ||
ac481c20 MP |
1397 | static inline int bdev_io_opt(struct block_device *bdev) |
1398 | { | |
1399 | return queue_io_opt(bdev_get_queue(bdev)); | |
1400 | } | |
1401 | ||
af2c68fe | 1402 | static inline int queue_alignment_offset(const struct request_queue *q) |
c72758f3 | 1403 | { |
ac481c20 | 1404 | if (q->limits.misaligned) |
c72758f3 MP |
1405 | return -1; |
1406 | ||
ac481c20 | 1407 | return q->limits.alignment_offset; |
c72758f3 MP |
1408 | } |
1409 | ||
e03a72e1 | 1410 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1411 | { |
1412 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
233bde21 BVA |
1413 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
1414 | << SECTOR_SHIFT; | |
81744ee4 | 1415 | |
b8839b8c | 1416 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1417 | } |
1418 | ||
ac481c20 MP |
1419 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1420 | { | |
1421 | struct request_queue *q = bdev_get_queue(bdev); | |
1422 | ||
1423 | if (q->limits.misaligned) | |
1424 | return -1; | |
1425 | ||
1426 | if (bdev != bdev->bd_contains) | |
1427 | return bdev->bd_part->alignment_offset; | |
1428 | ||
1429 | return q->limits.alignment_offset; | |
1430 | } | |
1431 | ||
af2c68fe | 1432 | static inline int queue_discard_alignment(const struct request_queue *q) |
86b37281 MP |
1433 | { |
1434 | if (q->limits.discard_misaligned) | |
1435 | return -1; | |
1436 | ||
1437 | return q->limits.discard_alignment; | |
1438 | } | |
1439 | ||
e03a72e1 | 1440 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1441 | { |
59771079 | 1442 | unsigned int alignment, granularity, offset; |
dd3d145d | 1443 | |
a934a00a MP |
1444 | if (!lim->max_discard_sectors) |
1445 | return 0; | |
1446 | ||
59771079 | 1447 | /* Why are these in bytes, not sectors? */ |
233bde21 BVA |
1448 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
1449 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
59771079 LT |
1450 | if (!granularity) |
1451 | return 0; | |
1452 | ||
1453 | /* Offset of the partition start in 'granularity' sectors */ | |
1454 | offset = sector_div(sector, granularity); | |
1455 | ||
1456 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1457 | offset = (granularity + alignment - offset) % granularity; | |
1458 | ||
1459 | /* Turn it back into bytes, gaah */ | |
233bde21 | 1460 | return offset << SECTOR_SHIFT; |
86b37281 MP |
1461 | } |
1462 | ||
c6e66634 PB |
1463 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1464 | { | |
1465 | struct request_queue *q = bdev_get_queue(bdev); | |
1466 | ||
1467 | if (bdev != bdev->bd_contains) | |
1468 | return bdev->bd_part->discard_alignment; | |
1469 | ||
1470 | return q->limits.discard_alignment; | |
1471 | } | |
1472 | ||
4363ac7c MP |
1473 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1474 | { | |
1475 | struct request_queue *q = bdev_get_queue(bdev); | |
1476 | ||
1477 | if (q) | |
1478 | return q->limits.max_write_same_sectors; | |
1479 | ||
1480 | return 0; | |
1481 | } | |
1482 | ||
a6f0788e CK |
1483 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1484 | { | |
1485 | struct request_queue *q = bdev_get_queue(bdev); | |
1486 | ||
1487 | if (q) | |
1488 | return q->limits.max_write_zeroes_sectors; | |
1489 | ||
1490 | return 0; | |
1491 | } | |
1492 | ||
797476b8 DLM |
1493 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1494 | { | |
1495 | struct request_queue *q = bdev_get_queue(bdev); | |
1496 | ||
1497 | if (q) | |
1498 | return blk_queue_zoned_model(q); | |
1499 | ||
1500 | return BLK_ZONED_NONE; | |
1501 | } | |
1502 | ||
1503 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1504 | { | |
1505 | struct request_queue *q = bdev_get_queue(bdev); | |
1506 | ||
1507 | if (q) | |
1508 | return blk_queue_is_zoned(q); | |
1509 | ||
1510 | return false; | |
1511 | } | |
1512 | ||
113ab72e | 1513 | static inline sector_t bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1514 | { |
1515 | struct request_queue *q = bdev_get_queue(bdev); | |
1516 | ||
1517 | if (q) | |
f99e8648 | 1518 | return blk_queue_zone_sectors(q); |
6cc77e9c CH |
1519 | return 0; |
1520 | } | |
6a0cb1bc | 1521 | |
af2c68fe | 1522 | static inline int queue_dma_alignment(const struct request_queue *q) |
1da177e4 | 1523 | { |
482eb689 | 1524 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1525 | } |
1526 | ||
14417799 | 1527 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1528 | unsigned int len) |
1529 | { | |
1530 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1531 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1532 | } |
1533 | ||
1da177e4 LT |
1534 | /* assumes size > 256 */ |
1535 | static inline unsigned int blksize_bits(unsigned int size) | |
1536 | { | |
1537 | unsigned int bits = 8; | |
1538 | do { | |
1539 | bits++; | |
1540 | size >>= 1; | |
1541 | } while (size > 256); | |
1542 | return bits; | |
1543 | } | |
1544 | ||
2befb9e3 | 1545 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1546 | { |
1547 | return bdev->bd_block_size; | |
1548 | } | |
1549 | ||
59c3d45e | 1550 | int kblockd_schedule_work(struct work_struct *work); |
818cd1cb | 1551 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1552 | |
1da177e4 LT |
1553 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1554 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1555 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1556 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1557 | ||
7ba1ba12 MP |
1558 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1559 | ||
8288f496 MP |
1560 | enum blk_integrity_flags { |
1561 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1562 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1563 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1564 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1565 | }; |
7ba1ba12 | 1566 | |
18593088 | 1567 | struct blk_integrity_iter { |
7ba1ba12 MP |
1568 | void *prot_buf; |
1569 | void *data_buf; | |
3be91c4a | 1570 | sector_t seed; |
7ba1ba12 | 1571 | unsigned int data_size; |
3be91c4a | 1572 | unsigned short interval; |
7ba1ba12 MP |
1573 | const char *disk_name; |
1574 | }; | |
1575 | ||
4e4cbee9 | 1576 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
54d4e6ab MG |
1577 | typedef void (integrity_prepare_fn) (struct request *); |
1578 | typedef void (integrity_complete_fn) (struct request *, unsigned int); | |
7ba1ba12 | 1579 | |
0f8087ec MP |
1580 | struct blk_integrity_profile { |
1581 | integrity_processing_fn *generate_fn; | |
1582 | integrity_processing_fn *verify_fn; | |
54d4e6ab MG |
1583 | integrity_prepare_fn *prepare_fn; |
1584 | integrity_complete_fn *complete_fn; | |
0f8087ec MP |
1585 | const char *name; |
1586 | }; | |
7ba1ba12 | 1587 | |
25520d55 | 1588 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1589 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1590 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1591 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1592 | struct scatterlist *); | |
1593 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1594 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1595 | struct request *); | |
1596 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1597 | struct bio *); | |
7ba1ba12 | 1598 | |
25520d55 | 1599 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1600 | { |
ac6fc48c | 1601 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1602 | |
1603 | if (!bi->profile) | |
1604 | return NULL; | |
1605 | ||
1606 | return bi; | |
b04accc4 JA |
1607 | } |
1608 | ||
25520d55 MP |
1609 | static inline |
1610 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1611 | { |
25520d55 | 1612 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1613 | } |
1614 | ||
d145dc23 ST |
1615 | static inline bool |
1616 | blk_integrity_queue_supports_integrity(struct request_queue *q) | |
1617 | { | |
1618 | return q->integrity.profile; | |
1619 | } | |
1620 | ||
180b2f95 | 1621 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1622 | { |
180b2f95 | 1623 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1624 | } |
1625 | ||
13f05c8d MP |
1626 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1627 | unsigned int segs) | |
1628 | { | |
1629 | q->limits.max_integrity_segments = segs; | |
1630 | } | |
1631 | ||
1632 | static inline unsigned short | |
af2c68fe | 1633 | queue_max_integrity_segments(const struct request_queue *q) |
13f05c8d MP |
1634 | { |
1635 | return q->limits.max_integrity_segments; | |
1636 | } | |
1637 | ||
359f6427 GE |
1638 | /** |
1639 | * bio_integrity_intervals - Return number of integrity intervals for a bio | |
1640 | * @bi: blk_integrity profile for device | |
1641 | * @sectors: Size of the bio in 512-byte sectors | |
1642 | * | |
1643 | * Description: The block layer calculates everything in 512 byte | |
1644 | * sectors but integrity metadata is done in terms of the data integrity | |
1645 | * interval size of the storage device. Convert the block layer sectors | |
1646 | * to the appropriate number of integrity intervals. | |
1647 | */ | |
1648 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, | |
1649 | unsigned int sectors) | |
1650 | { | |
1651 | return sectors >> (bi->interval_exp - 9); | |
1652 | } | |
1653 | ||
1654 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1655 | unsigned int sectors) | |
1656 | { | |
1657 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; | |
1658 | } | |
1659 | ||
2a876f5e CH |
1660 | /* |
1661 | * Return the first bvec that contains integrity data. Only drivers that are | |
1662 | * limited to a single integrity segment should use this helper. | |
1663 | */ | |
1664 | static inline struct bio_vec *rq_integrity_vec(struct request *rq) | |
1665 | { | |
1666 | if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) | |
1667 | return NULL; | |
1668 | return rq->bio->bi_integrity->bip_vec; | |
1669 | } | |
1670 | ||
7ba1ba12 MP |
1671 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1672 | ||
fd83240a SR |
1673 | struct bio; |
1674 | struct block_device; | |
1675 | struct gendisk; | |
1676 | struct blk_integrity; | |
1677 | ||
1678 | static inline int blk_integrity_rq(struct request *rq) | |
1679 | { | |
1680 | return 0; | |
1681 | } | |
1682 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1683 | struct bio *b) | |
1684 | { | |
1685 | return 0; | |
1686 | } | |
1687 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1688 | struct bio *b, | |
1689 | struct scatterlist *s) | |
1690 | { | |
1691 | return 0; | |
1692 | } | |
1693 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1694 | { | |
61a04e5b | 1695 | return NULL; |
fd83240a SR |
1696 | } |
1697 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1698 | { | |
1699 | return NULL; | |
1700 | } | |
d145dc23 ST |
1701 | static inline bool |
1702 | blk_integrity_queue_supports_integrity(struct request_queue *q) | |
1703 | { | |
1704 | return false; | |
1705 | } | |
fd83240a SR |
1706 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) |
1707 | { | |
1708 | return 0; | |
1709 | } | |
25520d55 | 1710 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1711 | struct blk_integrity *b) |
1712 | { | |
fd83240a SR |
1713 | } |
1714 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1715 | { | |
1716 | } | |
1717 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1718 | unsigned int segs) | |
1719 | { | |
1720 | } | |
af2c68fe | 1721 | static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) |
fd83240a SR |
1722 | { |
1723 | return 0; | |
1724 | } | |
4eaf99be MP |
1725 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1726 | struct request *r1, | |
1727 | struct request *r2) | |
fd83240a | 1728 | { |
cb1a5ab6 | 1729 | return true; |
fd83240a | 1730 | } |
4eaf99be MP |
1731 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1732 | struct request *r, | |
1733 | struct bio *b) | |
fd83240a | 1734 | { |
cb1a5ab6 | 1735 | return true; |
fd83240a | 1736 | } |
25520d55 | 1737 | |
359f6427 GE |
1738 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
1739 | unsigned int sectors) | |
1740 | { | |
1741 | return 0; | |
1742 | } | |
1743 | ||
1744 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1745 | unsigned int sectors) | |
1746 | { | |
1747 | return 0; | |
1748 | } | |
1749 | ||
2a876f5e CH |
1750 | static inline struct bio_vec *rq_integrity_vec(struct request *rq) |
1751 | { | |
1752 | return NULL; | |
1753 | } | |
1754 | ||
7ba1ba12 MP |
1755 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1756 | ||
d145dc23 ST |
1757 | #ifdef CONFIG_BLK_INLINE_ENCRYPTION |
1758 | ||
1759 | bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); | |
1760 | ||
1761 | void blk_ksm_unregister(struct request_queue *q); | |
1762 | ||
1763 | #else /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1764 | ||
1765 | static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, | |
1766 | struct request_queue *q) | |
1767 | { | |
1768 | return true; | |
1769 | } | |
1770 | ||
1771 | static inline void blk_ksm_unregister(struct request_queue *q) { } | |
1772 | ||
1773 | #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ | |
1774 | ||
1775 | ||
08f85851 | 1776 | struct block_device_operations { |
c62b37d9 | 1777 | blk_qc_t (*submit_bio) (struct bio *bio); |
d4430d62 | 1778 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1779 | void (*release) (struct gendisk *, fmode_t); |
3f289dcb | 1780 | int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); |
d4430d62 AV |
1781 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1782 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
77ea887e TH |
1783 | unsigned int (*check_events) (struct gendisk *disk, |
1784 | unsigned int clearing); | |
1785 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1786 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1787 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1788 | int (*revalidate_disk) (struct gendisk *); |
1789 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1790 | /* this callback is with swap_lock and sometimes page table lock held */ |
1791 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
e76239a3 | 1792 | int (*report_zones)(struct gendisk *, sector_t sector, |
d4100351 | 1793 | unsigned int nr_zones, report_zones_cb cb, void *data); |
348e114b | 1794 | char *(*devnode)(struct gendisk *disk, umode_t *mode); |
08f85851 | 1795 | struct module *owner; |
bbd3e064 | 1796 | const struct pr_ops *pr_ops; |
08f85851 AV |
1797 | }; |
1798 | ||
ee6a129d AB |
1799 | #ifdef CONFIG_COMPAT |
1800 | extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, | |
1801 | unsigned int, unsigned long); | |
1802 | #else | |
1803 | #define blkdev_compat_ptr_ioctl NULL | |
1804 | #endif | |
1805 | ||
633a08b8 AV |
1806 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1807 | unsigned long); | |
47a191fd MW |
1808 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1809 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1810 | struct writeback_control *); | |
6cc77e9c CH |
1811 | |
1812 | #ifdef CONFIG_BLK_DEV_ZONED | |
1813 | bool blk_req_needs_zone_write_lock(struct request *rq); | |
1392d370 | 1814 | bool blk_req_zone_write_trylock(struct request *rq); |
6cc77e9c CH |
1815 | void __blk_req_zone_write_lock(struct request *rq); |
1816 | void __blk_req_zone_write_unlock(struct request *rq); | |
1817 | ||
1818 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1819 | { | |
1820 | if (blk_req_needs_zone_write_lock(rq)) | |
1821 | __blk_req_zone_write_lock(rq); | |
1822 | } | |
1823 | ||
1824 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1825 | { | |
1826 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) | |
1827 | __blk_req_zone_write_unlock(rq); | |
1828 | } | |
1829 | ||
1830 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1831 | { | |
1832 | return rq->q->seq_zones_wlock && | |
1833 | test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); | |
1834 | } | |
1835 | ||
1836 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1837 | { | |
1838 | if (!blk_req_needs_zone_write_lock(rq)) | |
1839 | return true; | |
1840 | return !blk_req_zone_is_write_locked(rq); | |
1841 | } | |
1842 | #else | |
1843 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) | |
1844 | { | |
1845 | return false; | |
1846 | } | |
1847 | ||
1848 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1849 | { | |
1850 | } | |
1851 | ||
1852 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1853 | { | |
1854 | } | |
1855 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1856 | { | |
1857 | return false; | |
1858 | } | |
1859 | ||
1860 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1861 | { | |
1862 | return true; | |
1863 | } | |
1864 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
1865 | ||
0619317f JA |
1866 | static inline void blk_wake_io_task(struct task_struct *waiter) |
1867 | { | |
1868 | /* | |
1869 | * If we're polling, the task itself is doing the completions. For | |
1870 | * that case, we don't need to signal a wakeup, it's enough to just | |
1871 | * mark us as RUNNING. | |
1872 | */ | |
1873 | if (waiter == current) | |
1874 | __set_current_state(TASK_RUNNING); | |
1875 | else | |
1876 | wake_up_process(waiter); | |
1877 | } | |
1878 | ||
956d510e CH |
1879 | unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, |
1880 | unsigned int op); | |
1881 | void disk_end_io_acct(struct gendisk *disk, unsigned int op, | |
1882 | unsigned long start_time); | |
1883 | ||
956d510e CH |
1884 | /** |
1885 | * bio_start_io_acct - start I/O accounting for bio based drivers | |
1886 | * @bio: bio to start account for | |
1887 | * | |
1888 | * Returns the start time that should be passed back to bio_end_io_acct(). | |
1889 | */ | |
1890 | static inline unsigned long bio_start_io_acct(struct bio *bio) | |
1891 | { | |
1892 | return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); | |
1893 | } | |
1894 | ||
1895 | /** | |
1896 | * bio_end_io_acct - end I/O accounting for bio based drivers | |
1897 | * @bio: bio to end account for | |
1898 | * @start: start time returned by bio_start_io_acct() | |
1899 | */ | |
1900 | static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) | |
1901 | { | |
1902 | return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time); | |
1903 | } | |
956d510e | 1904 | |
3f1266f1 CH |
1905 | int bdev_read_only(struct block_device *bdev); |
1906 | int set_blocksize(struct block_device *bdev, int size); | |
1907 | ||
1908 | const char *bdevname(struct block_device *bdev, char *buffer); | |
1909 | struct block_device *lookup_bdev(const char *); | |
1910 | ||
1911 | void blkdev_show(struct seq_file *seqf, off_t offset); | |
1912 | ||
1913 | #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ | |
1914 | #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ | |
1915 | #ifdef CONFIG_BLOCK | |
1916 | #define BLKDEV_MAJOR_MAX 512 | |
1917 | #else | |
1918 | #define BLKDEV_MAJOR_MAX 0 | |
1919 | #endif | |
1920 | ||
1921 | int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); | |
1922 | struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, | |
1923 | void *holder); | |
1924 | struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); | |
1925 | struct block_device *bd_start_claiming(struct block_device *bdev, void *holder); | |
1926 | void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, | |
1927 | void *holder); | |
1928 | void blkdev_put(struct block_device *bdev, fmode_t mode); | |
1929 | ||
621c1f42 | 1930 | struct block_device *I_BDEV(struct inode *inode); |
3f1266f1 CH |
1931 | struct block_device *bdget(dev_t); |
1932 | struct block_device *bdgrab(struct block_device *bdev); | |
1933 | void bdput(struct block_device *); | |
1934 | ||
1935 | #ifdef CONFIG_BLOCK | |
1936 | void invalidate_bdev(struct block_device *bdev); | |
1937 | int sync_blockdev(struct block_device *bdev); | |
1938 | #else | |
1939 | static inline void invalidate_bdev(struct block_device *bdev) | |
1940 | { | |
1941 | } | |
1942 | static inline int sync_blockdev(struct block_device *bdev) | |
1943 | { | |
1944 | return 0; | |
1945 | } | |
1da177e4 | 1946 | #endif |
3f1266f1 CH |
1947 | int fsync_bdev(struct block_device *bdev); |
1948 | ||
1949 | struct super_block *freeze_bdev(struct block_device *bdev); | |
1950 | int thaw_bdev(struct block_device *bdev, struct super_block *sb); | |
1951 | ||
1952 | #endif /* _LINUX_BLKDEV_H */ |