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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> |
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 | ||
8bd435b3 TH |
53 | /* |
54 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
55 | * Defined here to simplify include dependency. | |
56 | */ | |
01c5f85a | 57 | #define BLKCG_MAX_POLS 5 |
8bd435b3 | 58 | |
2a842aca | 59 | typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
1da177e4 | 60 | |
5b788ce3 TH |
61 | #define BLK_RL_SYNCFULL (1U << 0) |
62 | #define BLK_RL_ASYNCFULL (1U << 1) | |
63 | ||
1da177e4 | 64 | struct request_list { |
5b788ce3 | 65 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
66 | #ifdef CONFIG_BLK_CGROUP |
67 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
68 | #endif | |
1faa16d2 JA |
69 | /* |
70 | * count[], starved[], and wait[] are indexed by | |
71 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
72 | */ | |
8a5ecdd4 TH |
73 | int count[2]; |
74 | int starved[2]; | |
75 | mempool_t *rq_pool; | |
76 | wait_queue_head_t wait[2]; | |
5b788ce3 | 77 | unsigned int flags; |
1da177e4 LT |
78 | }; |
79 | ||
e8064021 CH |
80 | /* |
81 | * request flags */ | |
82 | typedef __u32 __bitwise req_flags_t; | |
83 | ||
84 | /* elevator knows about this request */ | |
85 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
86 | /* drive already may have started this one */ | |
87 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
88 | /* uses tagged queueing */ | |
89 | #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) | |
90 | /* may not be passed by ioscheduler */ | |
91 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
92 | /* request for flush sequence */ | |
93 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
94 | /* merge of different types, fail separately */ | |
95 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
96 | /* track inflight for MQ */ | |
97 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
98 | /* don't call prep for this one */ | |
99 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
100 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
101 | "quiesce" state must be ignored. */ | |
102 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
103 | /* contains copies of user pages */ | |
104 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
105 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
106 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
107 | /* don't warn about errors */ | |
108 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
109 | /* elevator private data attached */ | |
110 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
4822e902 | 111 | /* account into disk and partition IO statistics */ |
e8064021 CH |
112 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) |
113 | /* request came from our alloc pool */ | |
114 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
115 | /* runtime pm request */ | |
116 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
117 | /* on IO scheduler merge hash */ | |
118 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
4822e902 | 119 | /* track IO completion time */ |
cf43e6be | 120 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) |
f9d03f96 CH |
121 | /* Look at ->special_vec for the actual data payload instead of the |
122 | bio chain. */ | |
123 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
6cc77e9c CH |
124 | /* The per-zone write lock is held for this request */ |
125 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) | |
76a86f9d | 126 | /* already slept for hybrid poll */ |
12f5b931 | 127 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) |
da661267 CH |
128 | /* ->timeout has been called, don't expire again */ |
129 | #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) | |
e8064021 CH |
130 | |
131 | /* flags that prevent us from merging requests: */ | |
132 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 133 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 134 | |
12f5b931 KB |
135 | /* |
136 | * Request state for blk-mq. | |
137 | */ | |
138 | enum mq_rq_state { | |
139 | MQ_RQ_IDLE = 0, | |
140 | MQ_RQ_IN_FLIGHT = 1, | |
141 | MQ_RQ_COMPLETE = 2, | |
142 | }; | |
143 | ||
1da177e4 | 144 | /* |
af76e555 CH |
145 | * Try to put the fields that are referenced together in the same cacheline. |
146 | * | |
147 | * If you modify this structure, make sure to update blk_rq_init() and | |
148 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
149 | */ |
150 | struct request { | |
165125e1 | 151 | struct request_queue *q; |
320ae51f | 152 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 153 | |
ca93e453 | 154 | int cpu; |
ef295ecf | 155 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 156 | req_flags_t rq_flags; |
d486f1f2 JA |
157 | |
158 | int internal_tag; | |
159 | ||
a2dec7b3 | 160 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 161 | unsigned int __data_len; /* total data len */ |
bd166ef1 | 162 | int tag; |
181fdde3 | 163 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
164 | |
165 | struct bio *bio; | |
166 | struct bio *biotail; | |
167 | ||
7c3fb70f JA |
168 | struct list_head queuelist; |
169 | ||
360f92c2 JA |
170 | /* |
171 | * The hash is used inside the scheduler, and killed once the | |
172 | * request reaches the dispatch list. The ipi_list is only used | |
173 | * to queue the request for softirq completion, which is long | |
174 | * after the request has been unhashed (and even removed from | |
175 | * the dispatch list). | |
176 | */ | |
177 | union { | |
178 | struct hlist_node hash; /* merge hash */ | |
179 | struct list_head ipi_list; | |
180 | }; | |
181 | ||
e6a1c874 JA |
182 | /* |
183 | * The rb_node is only used inside the io scheduler, requests | |
184 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 185 | * completion_data share space with the rb_node. |
e6a1c874 JA |
186 | */ |
187 | union { | |
188 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 189 | struct bio_vec special_vec; |
c186794d | 190 | void *completion_data; |
e26738e0 | 191 | int error_count; /* for legacy drivers, don't use */ |
e6a1c874 | 192 | }; |
9817064b | 193 | |
ff7d145f | 194 | /* |
7f1dc8a2 | 195 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
196 | * more they have to dynamically allocate it. Flush requests are |
197 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 198 | * space with the elevator data. |
ff7d145f | 199 | */ |
c186794d | 200 | union { |
a612fddf TH |
201 | struct { |
202 | struct io_cq *icq; | |
203 | void *priv[2]; | |
204 | } elv; | |
205 | ||
c186794d MS |
206 | struct { |
207 | unsigned int seq; | |
208 | struct list_head list; | |
4853abaa | 209 | rq_end_io_fn *saved_end_io; |
c186794d MS |
210 | } flush; |
211 | }; | |
ff7d145f | 212 | |
8f34ee75 | 213 | struct gendisk *rq_disk; |
09e099d4 | 214 | struct hd_struct *part; |
522a7775 OS |
215 | /* Time that I/O was submitted to the kernel. */ |
216 | u64 start_time_ns; | |
544ccc8d OS |
217 | /* Time that I/O was submitted to the device. */ |
218 | u64 io_start_time_ns; | |
219 | ||
220 | #ifdef CONFIG_BLK_WBT | |
221 | unsigned short wbt_flags; | |
222 | #endif | |
223 | #ifdef CONFIG_BLK_DEV_THROTTLING_LOW | |
224 | unsigned short throtl_size; | |
225 | #endif | |
226 | ||
227 | /* | |
228 | * Number of scatter-gather DMA addr+len pairs after | |
1da177e4 LT |
229 | * physical address coalescing is performed. |
230 | */ | |
231 | unsigned short nr_phys_segments; | |
7c3fb70f | 232 | |
13f05c8d MP |
233 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
234 | unsigned short nr_integrity_segments; | |
235 | #endif | |
1da177e4 | 236 | |
7c3fb70f | 237 | unsigned short write_hint; |
8f34ee75 JA |
238 | unsigned short ioprio; |
239 | ||
731ec497 | 240 | void *special; /* opaque pointer available for LLD use */ |
cdd60262 | 241 | |
7a85f889 | 242 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 243 | |
12f5b931 KB |
244 | enum mq_rq_state state; |
245 | refcount_t ref; | |
1d9bd516 | 246 | |
0b7576d8 JA |
247 | unsigned int timeout; |
248 | ||
0a72e7f4 JA |
249 | /* access through blk_rq_set_deadline, blk_rq_deadline */ |
250 | unsigned long __deadline; | |
cb6934f8 | 251 | |
242f9dcb | 252 | struct list_head timeout_list; |
1da177e4 | 253 | |
7c3fb70f | 254 | union { |
0a4b6e2f | 255 | struct __call_single_data csd; |
7c3fb70f JA |
256 | u64 fifo_time; |
257 | }; | |
258 | ||
1da177e4 | 259 | /* |
c00895ab | 260 | * completion callback. |
1da177e4 LT |
261 | */ |
262 | rq_end_io_fn *end_io; | |
263 | void *end_io_data; | |
abae1fde FT |
264 | |
265 | /* for bidi */ | |
266 | struct request *next_rq; | |
7c3fb70f JA |
267 | |
268 | #ifdef CONFIG_BLK_CGROUP | |
269 | struct request_list *rl; /* rl this rq is alloced from */ | |
7c3fb70f | 270 | #endif |
1da177e4 LT |
271 | }; |
272 | ||
14cb0dc6 ML |
273 | static inline bool blk_op_is_scsi(unsigned int op) |
274 | { | |
275 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; | |
276 | } | |
277 | ||
278 | static inline bool blk_op_is_private(unsigned int op) | |
279 | { | |
280 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; | |
281 | } | |
282 | ||
aebf526b CH |
283 | static inline bool blk_rq_is_scsi(struct request *rq) |
284 | { | |
14cb0dc6 | 285 | return blk_op_is_scsi(req_op(rq)); |
aebf526b CH |
286 | } |
287 | ||
288 | static inline bool blk_rq_is_private(struct request *rq) | |
289 | { | |
14cb0dc6 | 290 | return blk_op_is_private(req_op(rq)); |
aebf526b CH |
291 | } |
292 | ||
57292b58 CH |
293 | static inline bool blk_rq_is_passthrough(struct request *rq) |
294 | { | |
aebf526b | 295 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
296 | } |
297 | ||
14cb0dc6 ML |
298 | static inline bool bio_is_passthrough(struct bio *bio) |
299 | { | |
300 | unsigned op = bio_op(bio); | |
301 | ||
302 | return blk_op_is_scsi(op) || blk_op_is_private(op); | |
303 | } | |
304 | ||
766ca442 FLVC |
305 | static inline unsigned short req_get_ioprio(struct request *req) |
306 | { | |
307 | return req->ioprio; | |
308 | } | |
309 | ||
1da177e4 LT |
310 | #include <linux/elevator.h> |
311 | ||
320ae51f JA |
312 | struct blk_queue_ctx; |
313 | ||
165125e1 | 314 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 315 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
ea435e1b | 316 | typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); |
165125e1 | 317 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 318 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
319 | |
320 | struct bio_vec; | |
ff856bad | 321 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 322 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 323 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 324 | typedef int (bsg_job_fn) (struct bsg_job *); |
6d247d7f CH |
325 | typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t); |
326 | typedef void (exit_rq_fn)(struct request_queue *, struct request *); | |
1da177e4 | 327 | |
242f9dcb | 328 | enum blk_eh_timer_return { |
88b0cfad CH |
329 | BLK_EH_DONE, /* drivers has completed the command */ |
330 | BLK_EH_RESET_TIMER, /* reset timer and try again */ | |
242f9dcb JA |
331 | }; |
332 | ||
333 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
334 | ||
1da177e4 LT |
335 | enum blk_queue_state { |
336 | Queue_down, | |
337 | Queue_up, | |
338 | }; | |
339 | ||
1da177e4 LT |
340 | struct blk_queue_tag { |
341 | struct request **tag_index; /* map of busy tags */ | |
342 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 | 343 | int max_depth; /* what we will send to device */ |
ba025082 | 344 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 345 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
346 | int alloc_policy; /* tag allocation policy */ |
347 | int next_tag; /* next tag */ | |
1da177e4 | 348 | }; |
ee1b6f7a SL |
349 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
350 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 351 | |
abf54393 FT |
352 | #define BLK_SCSI_MAX_CMDS (256) |
353 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
354 | ||
797476b8 DLM |
355 | /* |
356 | * Zoned block device models (zoned limit). | |
357 | */ | |
358 | enum blk_zoned_model { | |
359 | BLK_ZONED_NONE, /* Regular block device */ | |
360 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
361 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
362 | }; | |
363 | ||
025146e1 MP |
364 | struct queue_limits { |
365 | unsigned long bounce_pfn; | |
366 | unsigned long seg_boundary_mask; | |
03100aad | 367 | unsigned long virt_boundary_mask; |
025146e1 MP |
368 | |
369 | unsigned int max_hw_sectors; | |
ca369d51 | 370 | unsigned int max_dev_sectors; |
762380ad | 371 | unsigned int chunk_sectors; |
025146e1 MP |
372 | unsigned int max_sectors; |
373 | unsigned int max_segment_size; | |
c72758f3 MP |
374 | unsigned int physical_block_size; |
375 | unsigned int alignment_offset; | |
376 | unsigned int io_min; | |
377 | unsigned int io_opt; | |
67efc925 | 378 | unsigned int max_discard_sectors; |
0034af03 | 379 | unsigned int max_hw_discard_sectors; |
4363ac7c | 380 | unsigned int max_write_same_sectors; |
a6f0788e | 381 | unsigned int max_write_zeroes_sectors; |
86b37281 MP |
382 | unsigned int discard_granularity; |
383 | unsigned int discard_alignment; | |
025146e1 MP |
384 | |
385 | unsigned short logical_block_size; | |
8a78362c | 386 | unsigned short max_segments; |
13f05c8d | 387 | unsigned short max_integrity_segments; |
1e739730 | 388 | unsigned short max_discard_segments; |
025146e1 | 389 | |
c72758f3 | 390 | unsigned char misaligned; |
86b37281 | 391 | unsigned char discard_misaligned; |
e692cb66 | 392 | unsigned char cluster; |
c78afc62 | 393 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 394 | enum blk_zoned_model zoned; |
025146e1 MP |
395 | }; |
396 | ||
6a0cb1bc HR |
397 | #ifdef CONFIG_BLK_DEV_ZONED |
398 | ||
a91e1380 | 399 | extern unsigned int blkdev_nr_zones(struct block_device *bdev); |
6a0cb1bc HR |
400 | extern int blkdev_report_zones(struct block_device *bdev, |
401 | sector_t sector, struct blk_zone *zones, | |
402 | unsigned int *nr_zones, gfp_t gfp_mask); | |
403 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
404 | sector_t nr_sectors, gfp_t gfp_mask); | |
bf505456 | 405 | extern int blk_revalidate_disk_zones(struct gendisk *disk); |
6a0cb1bc | 406 | |
3ed05a98 ST |
407 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
408 | unsigned int cmd, unsigned long arg); | |
409 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
410 | unsigned int cmd, unsigned long arg); | |
411 | ||
412 | #else /* CONFIG_BLK_DEV_ZONED */ | |
413 | ||
a91e1380 DLM |
414 | static inline unsigned int blkdev_nr_zones(struct block_device *bdev) |
415 | { | |
416 | return 0; | |
417 | } | |
bf505456 DLM |
418 | |
419 | static inline int blk_revalidate_disk_zones(struct gendisk *disk) | |
420 | { | |
421 | return 0; | |
422 | } | |
423 | ||
3ed05a98 ST |
424 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, |
425 | fmode_t mode, unsigned int cmd, | |
426 | unsigned long arg) | |
427 | { | |
428 | return -ENOTTY; | |
429 | } | |
430 | ||
431 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
432 | fmode_t mode, unsigned int cmd, | |
433 | unsigned long arg) | |
434 | { | |
435 | return -ENOTTY; | |
436 | } | |
437 | ||
6a0cb1bc HR |
438 | #endif /* CONFIG_BLK_DEV_ZONED */ |
439 | ||
d7b76301 | 440 | struct request_queue { |
1da177e4 LT |
441 | /* |
442 | * Together with queue_head for cacheline sharing | |
443 | */ | |
444 | struct list_head queue_head; | |
445 | struct request *last_merge; | |
b374d18a | 446 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
447 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
448 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 | 449 | |
34dbad5d | 450 | struct blk_queue_stats *stats; |
a7905043 | 451 | struct rq_qos *rq_qos; |
87760e5e | 452 | |
1da177e4 | 453 | /* |
a051661c TH |
454 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
455 | * is used, root blkg allocates from @q->root_rl and all other | |
456 | * blkgs from their own blkg->rl. Which one to use should be | |
457 | * determined using bio_request_list(). | |
1da177e4 | 458 | */ |
a051661c | 459 | struct request_list root_rl; |
1da177e4 LT |
460 | |
461 | request_fn_proc *request_fn; | |
1da177e4 | 462 | make_request_fn *make_request_fn; |
ea435e1b | 463 | poll_q_fn *poll_fn; |
1da177e4 | 464 | prep_rq_fn *prep_rq_fn; |
28018c24 | 465 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 466 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 467 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 468 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 469 | lld_busy_fn *lld_busy_fn; |
d280bab3 | 470 | /* Called just after a request is allocated */ |
6d247d7f | 471 | init_rq_fn *init_rq_fn; |
d280bab3 | 472 | /* Called just before a request is freed */ |
6d247d7f | 473 | exit_rq_fn *exit_rq_fn; |
d280bab3 BVA |
474 | /* Called from inside blk_get_request() */ |
475 | void (*initialize_rq_fn)(struct request *rq); | |
1da177e4 | 476 | |
f8a5b122 | 477 | const struct blk_mq_ops *mq_ops; |
320ae51f JA |
478 | |
479 | unsigned int *mq_map; | |
480 | ||
481 | /* sw queues */ | |
e6cdb092 | 482 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
483 | unsigned int nr_queues; |
484 | ||
d278d4a8 JA |
485 | unsigned int queue_depth; |
486 | ||
320ae51f JA |
487 | /* hw dispatch queues */ |
488 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
489 | unsigned int nr_hw_queues; | |
490 | ||
8922e16c TH |
491 | /* |
492 | * Dispatch queue sorting | |
493 | */ | |
1b47f531 | 494 | sector_t end_sector; |
8922e16c | 495 | struct request *boundary_rq; |
8922e16c | 496 | |
1da177e4 | 497 | /* |
3cca6dc1 | 498 | * Delayed queue handling |
1da177e4 | 499 | */ |
3cca6dc1 | 500 | struct delayed_work delay_work; |
1da177e4 | 501 | |
dc3b17cc | 502 | struct backing_dev_info *backing_dev_info; |
1da177e4 LT |
503 | |
504 | /* | |
505 | * The queue owner gets to use this for whatever they like. | |
506 | * ll_rw_blk doesn't touch it. | |
507 | */ | |
508 | void *queuedata; | |
509 | ||
1da177e4 | 510 | /* |
d7b76301 | 511 | * various queue flags, see QUEUE_* below |
1da177e4 | 512 | */ |
d7b76301 | 513 | unsigned long queue_flags; |
cd84a62e BVA |
514 | /* |
515 | * Number of contexts that have called blk_set_pm_only(). If this | |
516 | * counter is above zero then only RQF_PM and RQF_PREEMPT requests are | |
517 | * processed. | |
518 | */ | |
519 | atomic_t pm_only; | |
1da177e4 | 520 | |
a73f730d TH |
521 | /* |
522 | * ida allocated id for this queue. Used to index queues from | |
523 | * ioctx. | |
524 | */ | |
525 | int id; | |
526 | ||
1da177e4 | 527 | /* |
d7b76301 | 528 | * queue needs bounce pages for pages above this limit |
1da177e4 | 529 | */ |
d7b76301 | 530 | gfp_t bounce_gfp; |
1da177e4 LT |
531 | |
532 | /* | |
152587de JA |
533 | * protects queue structures from reentrancy. ->__queue_lock should |
534 | * _never_ be used directly, it is queue private. always use | |
535 | * ->queue_lock. | |
1da177e4 | 536 | */ |
152587de | 537 | spinlock_t __queue_lock; |
1da177e4 LT |
538 | spinlock_t *queue_lock; |
539 | ||
540 | /* | |
541 | * queue kobject | |
542 | */ | |
543 | struct kobject kobj; | |
544 | ||
320ae51f JA |
545 | /* |
546 | * mq queue kobject | |
547 | */ | |
548 | struct kobject mq_kobj; | |
549 | ||
ac6fc48c DW |
550 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
551 | struct blk_integrity integrity; | |
552 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
553 | ||
47fafbc7 | 554 | #ifdef CONFIG_PM |
6c954667 LM |
555 | struct device *dev; |
556 | int rpm_status; | |
557 | unsigned int nr_pending; | |
558 | #endif | |
559 | ||
1da177e4 LT |
560 | /* |
561 | * queue settings | |
562 | */ | |
563 | unsigned long nr_requests; /* Max # of requests */ | |
564 | unsigned int nr_congestion_on; | |
565 | unsigned int nr_congestion_off; | |
566 | unsigned int nr_batching; | |
567 | ||
fa0ccd83 | 568 | unsigned int dma_drain_size; |
d7b76301 | 569 | void *dma_drain_buffer; |
e3790c7d | 570 | unsigned int dma_pad_mask; |
1da177e4 LT |
571 | unsigned int dma_alignment; |
572 | ||
573 | struct blk_queue_tag *queue_tags; | |
574 | ||
15853af9 | 575 | unsigned int nr_sorted; |
0a7ae2ff | 576 | unsigned int in_flight[2]; |
cf43e6be | 577 | |
24faf6f6 BVA |
578 | /* |
579 | * Number of active block driver functions for which blk_drain_queue() | |
580 | * must wait. Must be incremented around functions that unlock the | |
581 | * queue_lock internally, e.g. scsi_request_fn(). | |
582 | */ | |
583 | unsigned int request_fn_active; | |
1da177e4 | 584 | |
242f9dcb | 585 | unsigned int rq_timeout; |
64f1c21e | 586 | int poll_nsec; |
34dbad5d OS |
587 | |
588 | struct blk_stat_callback *poll_cb; | |
0206319f | 589 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
34dbad5d | 590 | |
242f9dcb | 591 | struct timer_list timeout; |
287922eb | 592 | struct work_struct timeout_work; |
242f9dcb JA |
593 | struct list_head timeout_list; |
594 | ||
a612fddf | 595 | struct list_head icq_list; |
4eef3049 | 596 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 597 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 598 | struct blkcg_gq *root_blkg; |
03aa264a | 599 | struct list_head blkg_list; |
4eef3049 | 600 | #endif |
a612fddf | 601 | |
025146e1 MP |
602 | struct queue_limits limits; |
603 | ||
6a5ac984 | 604 | #ifdef CONFIG_BLK_DEV_ZONED |
6cc77e9c CH |
605 | /* |
606 | * Zoned block device information for request dispatch control. | |
607 | * nr_zones is the total number of zones of the device. This is always | |
608 | * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones | |
609 | * bits which indicates if a zone is conventional (bit clear) or | |
610 | * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones | |
611 | * bits which indicates if a zone is write locked, that is, if a write | |
612 | * request targeting the zone was dispatched. All three fields are | |
613 | * initialized by the low level device driver (e.g. scsi/sd.c). | |
614 | * Stacking drivers (device mappers) may or may not initialize | |
615 | * these fields. | |
ccce20fc BVA |
616 | * |
617 | * Reads of this information must be protected with blk_queue_enter() / | |
618 | * blk_queue_exit(). Modifying this information is only allowed while | |
619 | * no requests are being processed. See also blk_mq_freeze_queue() and | |
620 | * blk_mq_unfreeze_queue(). | |
6cc77e9c CH |
621 | */ |
622 | unsigned int nr_zones; | |
623 | unsigned long *seq_zones_bitmap; | |
624 | unsigned long *seq_zones_wlock; | |
6a5ac984 | 625 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 626 | |
1da177e4 LT |
627 | /* |
628 | * sg stuff | |
629 | */ | |
630 | unsigned int sg_timeout; | |
631 | unsigned int sg_reserved_size; | |
1946089a | 632 | int node; |
6c5c9341 | 633 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 634 | struct blk_trace *blk_trace; |
5acb3cc2 | 635 | struct mutex blk_trace_mutex; |
6c5c9341 | 636 | #endif |
1da177e4 | 637 | /* |
4913efe4 | 638 | * for flush operations |
1da177e4 | 639 | */ |
7c94e1c1 | 640 | struct blk_flush_queue *fq; |
483f4afc | 641 | |
6fca6a61 CH |
642 | struct list_head requeue_list; |
643 | spinlock_t requeue_lock; | |
2849450a | 644 | struct delayed_work requeue_work; |
6fca6a61 | 645 | |
483f4afc | 646 | struct mutex sysfs_lock; |
d351af01 | 647 | |
d732580b | 648 | int bypass_depth; |
4ecd4fef | 649 | atomic_t mq_freeze_depth; |
d732580b | 650 | |
d351af01 | 651 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 | 652 | bsg_job_fn *bsg_job_fn; |
d351af01 FT |
653 | struct bsg_class_device bsg_dev; |
654 | #endif | |
e43473b7 VG |
655 | |
656 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
657 | /* Throttle data */ | |
658 | struct throtl_data *td; | |
659 | #endif | |
548bc8e1 | 660 | struct rcu_head rcu_head; |
320ae51f | 661 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 662 | struct percpu_ref q_usage_counter; |
320ae51f | 663 | struct list_head all_q_node; |
0d2602ca JA |
664 | |
665 | struct blk_mq_tag_set *tag_set; | |
666 | struct list_head tag_set_list; | |
338aa96d | 667 | struct bio_set bio_split; |
4593fdbe | 668 | |
03796c14 | 669 | #ifdef CONFIG_BLK_DEBUG_FS |
07e4fead | 670 | struct dentry *debugfs_dir; |
d332ce09 | 671 | struct dentry *sched_debugfs_dir; |
07e4fead OS |
672 | #endif |
673 | ||
4593fdbe | 674 | bool mq_sysfs_init_done; |
6d247d7f CH |
675 | |
676 | size_t cmd_size; | |
677 | void *rq_alloc_data; | |
dc9edc44 BVA |
678 | |
679 | struct work_struct release_work; | |
f793dfd3 JA |
680 | |
681 | #define BLK_MAX_WRITE_HINTS 5 | |
682 | u64 write_hints[BLK_MAX_WRITE_HINTS]; | |
1da177e4 LT |
683 | }; |
684 | ||
e743eb1e JA |
685 | #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */ |
686 | #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */ | |
687 | #define QUEUE_FLAG_DYING 2 /* queue being torn down */ | |
688 | #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */ | |
689 | #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */ | |
690 | #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */ | |
691 | #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */ | |
692 | #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */ | |
e743eb1e | 693 | #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */ |
88e740f1 | 694 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
4822e902 | 695 | #define QUEUE_FLAG_IO_STAT 10 /* do disk/partitions IO accounting */ |
e743eb1e JA |
696 | #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */ |
697 | #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */ | |
698 | #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */ | |
699 | #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */ | |
700 | #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */ | |
701 | #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */ | |
702 | #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */ | |
703 | #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/ | |
704 | #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */ | |
705 | #define QUEUE_FLAG_WC 20 /* Write back caching */ | |
706 | #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */ | |
707 | #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */ | |
708 | #define QUEUE_FLAG_DAX 23 /* device supports DAX */ | |
4822e902 | 709 | #define QUEUE_FLAG_STATS 24 /* track IO start and completion times */ |
e743eb1e JA |
710 | #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */ |
711 | #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ | |
712 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ | |
713 | #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ | |
bd6bf7c1 | 714 | #define QUEUE_FLAG_PCI_P2PDMA 29 /* device supports PCI p2p requests */ |
bc58ba94 JA |
715 | |
716 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
e2e1a148 JA |
717 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
718 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 719 | |
94eddfbe | 720 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
8e0b60b9 CH |
721 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
722 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 723 | |
8814ce8a BVA |
724 | void blk_queue_flag_set(unsigned int flag, struct request_queue *q); |
725 | void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); | |
726 | bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); | |
727 | bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); | |
728 | ||
1da177e4 LT |
729 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
730 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 731 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 732 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 733 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 734 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 735 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
736 | #define blk_queue_noxmerges(q) \ |
737 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 738 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 739 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 740 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
c15227de | 741 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
742 | #define blk_queue_secure_erase(q) \ |
743 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 744 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
9efc160f BVA |
745 | #define blk_queue_scsi_passthrough(q) \ |
746 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) | |
49d92c0d LG |
747 | #define blk_queue_pci_p2pdma(q) \ |
748 | test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) | |
1da177e4 | 749 | |
33659ebb CH |
750 | #define blk_noretry_request(rq) \ |
751 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
752 | REQ_FAILFAST_DRIVER)) | |
f4560ffe | 753 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
cd84a62e | 754 | #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) |
0ce91444 | 755 | #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) |
c9254f2d | 756 | |
cd84a62e BVA |
757 | extern void blk_set_pm_only(struct request_queue *q); |
758 | extern void blk_clear_pm_only(struct request_queue *q); | |
33659ebb | 759 | |
66f91322 BVA |
760 | static inline int queue_in_flight(struct request_queue *q) |
761 | { | |
762 | return q->in_flight[0] + q->in_flight[1]; | |
763 | } | |
764 | ||
57292b58 CH |
765 | static inline bool blk_account_rq(struct request *rq) |
766 | { | |
767 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
768 | } | |
33659ebb | 769 | |
ab780f1e | 770 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 771 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
772 | /* rq->queuelist of dequeued request must be list_empty() */ |
773 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
774 | |
775 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
776 | ||
4e1b2d52 | 777 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 778 | |
49fd524f JA |
779 | /* |
780 | * Driver can handle struct request, if it either has an old style | |
781 | * request_fn defined, or is blk-mq based. | |
782 | */ | |
783 | static inline bool queue_is_rq_based(struct request_queue *q) | |
784 | { | |
785 | return q->request_fn || q->mq_ops; | |
786 | } | |
787 | ||
e692cb66 MP |
788 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
789 | { | |
790 | return q->limits.cluster; | |
791 | } | |
792 | ||
797476b8 DLM |
793 | static inline enum blk_zoned_model |
794 | blk_queue_zoned_model(struct request_queue *q) | |
795 | { | |
796 | return q->limits.zoned; | |
797 | } | |
798 | ||
799 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
800 | { | |
801 | switch (blk_queue_zoned_model(q)) { | |
802 | case BLK_ZONED_HA: | |
803 | case BLK_ZONED_HM: | |
804 | return true; | |
805 | default: | |
806 | return false; | |
807 | } | |
808 | } | |
809 | ||
f99e8648 | 810 | static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
811 | { |
812 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
813 | } | |
814 | ||
6a5ac984 | 815 | #ifdef CONFIG_BLK_DEV_ZONED |
965b652e DLM |
816 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
817 | { | |
818 | return blk_queue_is_zoned(q) ? q->nr_zones : 0; | |
819 | } | |
820 | ||
6cc77e9c CH |
821 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, |
822 | sector_t sector) | |
823 | { | |
824 | if (!blk_queue_is_zoned(q)) | |
825 | return 0; | |
826 | return sector >> ilog2(q->limits.chunk_sectors); | |
827 | } | |
828 | ||
829 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, | |
830 | sector_t sector) | |
831 | { | |
832 | if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap) | |
833 | return false; | |
834 | return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap); | |
835 | } | |
965b652e DLM |
836 | #else /* CONFIG_BLK_DEV_ZONED */ |
837 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) | |
838 | { | |
839 | return 0; | |
840 | } | |
6a5ac984 | 841 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 842 | |
1faa16d2 JA |
843 | static inline bool rq_is_sync(struct request *rq) |
844 | { | |
ef295ecf | 845 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
846 | } |
847 | ||
5b788ce3 | 848 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 849 | { |
5b788ce3 TH |
850 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
851 | ||
852 | return rl->flags & flag; | |
1da177e4 LT |
853 | } |
854 | ||
5b788ce3 | 855 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 856 | { |
5b788ce3 TH |
857 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
858 | ||
859 | rl->flags |= flag; | |
1da177e4 LT |
860 | } |
861 | ||
5b788ce3 | 862 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 863 | { |
5b788ce3 TH |
864 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
865 | ||
866 | rl->flags &= ~flag; | |
1da177e4 LT |
867 | } |
868 | ||
e2a60da7 MP |
869 | static inline bool rq_mergeable(struct request *rq) |
870 | { | |
57292b58 | 871 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 872 | return false; |
1da177e4 | 873 | |
3a5e02ce MC |
874 | if (req_op(rq) == REQ_OP_FLUSH) |
875 | return false; | |
876 | ||
a6f0788e CK |
877 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
878 | return false; | |
879 | ||
e2a60da7 | 880 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
881 | return false; |
882 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
883 | return false; |
884 | ||
885 | return true; | |
886 | } | |
1da177e4 | 887 | |
4363ac7c MP |
888 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
889 | { | |
efbeccdb CH |
890 | if (bio_page(a) == bio_page(b) && |
891 | bio_offset(a) == bio_offset(b)) | |
4363ac7c MP |
892 | return true; |
893 | ||
894 | return false; | |
895 | } | |
896 | ||
d278d4a8 JA |
897 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
898 | { | |
899 | if (q->queue_depth) | |
900 | return q->queue_depth; | |
901 | ||
902 | return q->nr_requests; | |
903 | } | |
904 | ||
1da177e4 LT |
905 | /* |
906 | * q->prep_rq_fn return values | |
907 | */ | |
0fb5b1fb MP |
908 | enum { |
909 | BLKPREP_OK, /* serve it */ | |
910 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
911 | BLKPREP_DEFER, /* leave on queue */ | |
912 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
913 | }; | |
1da177e4 LT |
914 | |
915 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
916 | ||
917 | /* | |
918 | * standard bounce addresses: | |
919 | * | |
920 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
921 | * BLK_BOUNCE_ANY : don't bounce anything | |
922 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
923 | */ | |
2472892a AK |
924 | |
925 | #if BITS_PER_LONG == 32 | |
1da177e4 | 926 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
927 | #else |
928 | #define BLK_BOUNCE_HIGH -1ULL | |
929 | #endif | |
930 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 931 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 932 | |
3d6392cf JA |
933 | /* |
934 | * default timeout for SG_IO if none specified | |
935 | */ | |
936 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 937 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 938 | |
152e283f FT |
939 | struct rq_map_data { |
940 | struct page **pages; | |
941 | int page_order; | |
942 | int nr_entries; | |
56c451f4 | 943 | unsigned long offset; |
97ae77a1 | 944 | int null_mapped; |
ecb554a8 | 945 | int from_user; |
152e283f FT |
946 | }; |
947 | ||
5705f702 | 948 | struct req_iterator { |
7988613b | 949 | struct bvec_iter iter; |
5705f702 N |
950 | struct bio *bio; |
951 | }; | |
952 | ||
953 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
954 | #define for_each_bio(_bio) \ |
955 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 956 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
957 | if ((rq->bio)) \ |
958 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
959 | ||
5705f702 N |
960 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
961 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 962 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 963 | |
4550dd6c | 964 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 965 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 966 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 967 | |
2d4dc890 IL |
968 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
969 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
970 | #endif | |
971 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
972 | extern void rq_flush_dcache_pages(struct request *rq); | |
973 | #else | |
974 | static inline void rq_flush_dcache_pages(struct request *rq) | |
975 | { | |
976 | } | |
977 | #endif | |
978 | ||
1da177e4 LT |
979 | extern int blk_register_queue(struct gendisk *disk); |
980 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 981 | extern blk_qc_t generic_make_request(struct bio *bio); |
f421e1d9 | 982 | extern blk_qc_t direct_make_request(struct bio *bio); |
2a4aa30c | 983 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
da8d7f07 | 984 | extern void blk_init_request_from_bio(struct request *req, struct bio *bio); |
1da177e4 | 985 | extern void blk_put_request(struct request *); |
165125e1 | 986 | extern void __blk_put_request(struct request_queue *, struct request *); |
cd6ce148 | 987 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
ff005a06 | 988 | blk_mq_req_flags_t flags); |
165125e1 | 989 | extern void blk_requeue_request(struct request_queue *, struct request *); |
ef9e3fac | 990 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
991 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
992 | struct bio_set *bs, gfp_t gfp_mask, | |
993 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
994 | void *data); | |
995 | extern void blk_rq_unprep_clone(struct request *rq); | |
2a842aca | 996 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
82124d60 | 997 | struct request *rq); |
0abc2a10 | 998 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
3cca6dc1 | 999 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
af67c31f | 1000 | extern void blk_queue_split(struct request_queue *, struct bio **); |
165125e1 | 1001 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 1002 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
1003 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
1004 | unsigned int, void __user *); | |
74f3c8af AV |
1005 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
1006 | unsigned int, void __user *); | |
e915e872 AV |
1007 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
1008 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 1009 | |
9a95e4ef | 1010 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
2e6edc95 | 1011 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 1012 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 1013 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 1014 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 1015 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 1016 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 1017 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 1018 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 1019 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 1020 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 1021 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
1022 | struct rq_map_data *, void __user *, unsigned long, |
1023 | gfp_t); | |
8e5cfc45 | 1024 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
1025 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
1026 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
1027 | struct rq_map_data *, const struct iov_iter *, |
1028 | gfp_t); | |
b7819b92 | 1029 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 1030 | struct request *, int); |
165125e1 | 1031 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 1032 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 1033 | |
2a842aca CH |
1034 | int blk_status_to_errno(blk_status_t status); |
1035 | blk_status_t errno_to_blk_status(int errno); | |
1036 | ||
ea435e1b | 1037 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
05229bee | 1038 | |
165125e1 | 1039 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 1040 | { |
ff9ea323 | 1041 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
1042 | } |
1043 | ||
233bde21 BVA |
1044 | /* |
1045 | * The basic unit of block I/O is a sector. It is used in a number of contexts | |
1046 | * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 | |
1047 | * bytes. Variables of type sector_t represent an offset or size that is a | |
1048 | * multiple of 512 bytes. Hence these two constants. | |
1049 | */ | |
1050 | #ifndef SECTOR_SHIFT | |
1051 | #define SECTOR_SHIFT 9 | |
1052 | #endif | |
1053 | #ifndef SECTOR_SIZE | |
1054 | #define SECTOR_SIZE (1 << SECTOR_SHIFT) | |
1055 | #endif | |
1056 | ||
5efccd17 | 1057 | /* |
80a761fd TH |
1058 | * blk_rq_pos() : the current sector |
1059 | * blk_rq_bytes() : bytes left in the entire request | |
1060 | * blk_rq_cur_bytes() : bytes left in the current segment | |
1061 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
1062 | * blk_rq_sectors() : sectors left in the entire request | |
1063 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 1064 | */ |
5b93629b TH |
1065 | static inline sector_t blk_rq_pos(const struct request *rq) |
1066 | { | |
a2dec7b3 | 1067 | return rq->__sector; |
2e46e8b2 TH |
1068 | } |
1069 | ||
1070 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
1071 | { | |
a2dec7b3 | 1072 | return rq->__data_len; |
5b93629b TH |
1073 | } |
1074 | ||
2e46e8b2 TH |
1075 | static inline int blk_rq_cur_bytes(const struct request *rq) |
1076 | { | |
1077 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
1078 | } | |
5efccd17 | 1079 | |
80a761fd TH |
1080 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
1081 | ||
5b93629b TH |
1082 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1083 | { | |
233bde21 | 1084 | return blk_rq_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
1085 | } |
1086 | ||
1087 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
1088 | { | |
233bde21 | 1089 | return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; |
5b93629b TH |
1090 | } |
1091 | ||
6a5ac984 | 1092 | #ifdef CONFIG_BLK_DEV_ZONED |
6cc77e9c CH |
1093 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
1094 | { | |
1095 | return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); | |
1096 | } | |
1097 | ||
1098 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) | |
1099 | { | |
1100 | return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); | |
1101 | } | |
6a5ac984 | 1102 | #endif /* CONFIG_BLK_DEV_ZONED */ |
6cc77e9c | 1103 | |
2e3258ec CH |
1104 | /* |
1105 | * Some commands like WRITE SAME have a payload or data transfer size which | |
1106 | * is different from the size of the request. Any driver that supports such | |
1107 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
1108 | * calculate the data transfer size. | |
1109 | */ | |
1110 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
1111 | { | |
1112 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1113 | return rq->special_vec.bv_len; | |
1114 | return blk_rq_bytes(rq); | |
1115 | } | |
1116 | ||
f31dc1cd | 1117 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 1118 | int op) |
f31dc1cd | 1119 | { |
7afafc8a | 1120 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
233bde21 BVA |
1121 | return min(q->limits.max_discard_sectors, |
1122 | UINT_MAX >> SECTOR_SHIFT); | |
f31dc1cd | 1123 | |
8fe0d473 | 1124 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1125 | return q->limits.max_write_same_sectors; |
1126 | ||
a6f0788e CK |
1127 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1128 | return q->limits.max_write_zeroes_sectors; | |
1129 | ||
f31dc1cd MP |
1130 | return q->limits.max_sectors; |
1131 | } | |
1132 | ||
762380ad JA |
1133 | /* |
1134 | * Return maximum size of a request at given offset. Only valid for | |
1135 | * file system requests. | |
1136 | */ | |
1137 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1138 | sector_t offset) | |
1139 | { | |
1140 | if (!q->limits.chunk_sectors) | |
736ed4de | 1141 | return q->limits.max_sectors; |
762380ad | 1142 | |
15bfd21f KB |
1143 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
1144 | (offset & (q->limits.chunk_sectors - 1)))); | |
762380ad JA |
1145 | } |
1146 | ||
17007f39 DLM |
1147 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1148 | sector_t offset) | |
f31dc1cd MP |
1149 | { |
1150 | struct request_queue *q = rq->q; | |
1151 | ||
57292b58 | 1152 | if (blk_rq_is_passthrough(rq)) |
f31dc1cd MP |
1153 | return q->limits.max_hw_sectors; |
1154 | ||
7afafc8a AH |
1155 | if (!q->limits.chunk_sectors || |
1156 | req_op(rq) == REQ_OP_DISCARD || | |
1157 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1158 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1159 | |
17007f39 | 1160 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1161 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1162 | } |
1163 | ||
75afb352 JN |
1164 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1165 | { | |
1166 | unsigned int nr_bios = 0; | |
1167 | struct bio *bio; | |
1168 | ||
1169 | __rq_for_each_bio(bio, rq) | |
1170 | nr_bios++; | |
1171 | ||
1172 | return nr_bios; | |
1173 | } | |
1174 | ||
9934c8c0 TH |
1175 | /* |
1176 | * Request issue related functions. | |
1177 | */ | |
1178 | extern struct request *blk_peek_request(struct request_queue *q); | |
1179 | extern void blk_start_request(struct request *rq); | |
1180 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1181 | ||
ef71de8b CH |
1182 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1183 | ||
1da177e4 | 1184 | /* |
2e60e022 TH |
1185 | * Request completion related functions. |
1186 | * | |
1187 | * blk_update_request() completes given number of bytes and updates | |
1188 | * the request without completing it. | |
1189 | * | |
f06d9a2b TH |
1190 | * blk_end_request() and friends. __blk_end_request() must be called |
1191 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1192 | * |
1193 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1194 | * blk_end_request() for parts of the original function. |
1195 | * This prevents code duplication in drivers. | |
1da177e4 | 1196 | */ |
2a842aca | 1197 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
2e60e022 | 1198 | unsigned int nr_bytes); |
2a842aca CH |
1199 | extern void blk_finish_request(struct request *rq, blk_status_t error); |
1200 | extern bool blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1201 | unsigned int nr_bytes); |
2a842aca CH |
1202 | extern void blk_end_request_all(struct request *rq, blk_status_t error); |
1203 | extern bool __blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1204 | unsigned int nr_bytes); |
2a842aca CH |
1205 | extern void __blk_end_request_all(struct request *rq, blk_status_t error); |
1206 | extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); | |
2e60e022 | 1207 | |
ff856bad | 1208 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1209 | extern void __blk_complete_request(struct request *); |
1210 | extern void blk_abort_request(struct request *); | |
28018c24 | 1211 | extern void blk_unprep_request(struct request *); |
ff856bad | 1212 | |
1da177e4 LT |
1213 | /* |
1214 | * Access functions for manipulating queue properties | |
1215 | */ | |
165125e1 | 1216 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1217 | spinlock_t *lock, int node_id); |
165125e1 | 1218 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
5ea708d1 | 1219 | extern int blk_init_allocated_queue(struct request_queue *); |
165125e1 JA |
1220 | extern void blk_cleanup_queue(struct request_queue *); |
1221 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1222 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1223 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1224 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1225 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1e739730 CH |
1226 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1227 | unsigned short); | |
165125e1 | 1228 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1229 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1230 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1231 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1232 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1233 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1234 | unsigned int max_write_same_sectors); | |
e1defc4f | 1235 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1236 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1237 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1238 | unsigned int alignment); | |
7c958e32 | 1239 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1240 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1241 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1242 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1243 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1244 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1245 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1246 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1247 | sector_t offset); | |
17be8c24 MP |
1248 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1249 | sector_t offset); | |
c72758f3 MP |
1250 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1251 | sector_t offset); | |
165125e1 | 1252 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1253 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1254 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1255 | extern int blk_queue_dma_drain(struct request_queue *q, |
1256 | dma_drain_needed_fn *dma_drain_needed, | |
1257 | void *buf, unsigned int size); | |
ef9e3fac | 1258 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1259 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1260 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1261 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1262 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1263 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1264 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1265 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1266 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1267 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1268 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1269 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1270 | |
1e739730 CH |
1271 | /* |
1272 | * Number of physical segments as sent to the device. | |
1273 | * | |
1274 | * Normally this is the number of discontiguous data segments sent by the | |
1275 | * submitter. But for data-less command like discard we might have no | |
1276 | * actual data segments submitted, but the driver might have to add it's | |
1277 | * own special payload. In that case we still return 1 here so that this | |
1278 | * special payload will be mapped. | |
1279 | */ | |
f9d03f96 CH |
1280 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1281 | { | |
1282 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1283 | return 1; | |
1284 | return rq->nr_phys_segments; | |
1285 | } | |
1286 | ||
1e739730 CH |
1287 | /* |
1288 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1289 | * Each discard bio merged into a request is counted as one segment. | |
1290 | */ | |
1291 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1292 | { | |
1293 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1294 | } | |
1295 | ||
165125e1 | 1296 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1297 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1298 | extern long nr_blockdev_pages(void); |
1da177e4 | 1299 | |
09ac46c4 | 1300 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 | 1301 | struct request_queue *blk_alloc_queue(gfp_t); |
5ee0524b BVA |
1302 | struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id, |
1303 | spinlock_t *lock); | |
165125e1 | 1304 | extern void blk_put_queue(struct request_queue *); |
3f21c265 | 1305 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1306 | |
316cc67d | 1307 | /* |
75df7136 SJ |
1308 | * blk_plug permits building a queue of related requests by holding the I/O |
1309 | * fragments for a short period. This allows merging of sequential requests | |
1310 | * into single larger request. As the requests are moved from a per-task list to | |
1311 | * the device's request_queue in a batch, this results in improved scalability | |
1312 | * as the lock contention for request_queue lock is reduced. | |
1313 | * | |
1314 | * It is ok not to disable preemption when adding the request to the plug list | |
1315 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1316 | * the plug list when the task sleeps by itself. For details, please see | |
1317 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1318 | */ |
73c10101 | 1319 | struct blk_plug { |
75df7136 | 1320 | struct list_head list; /* requests */ |
320ae51f | 1321 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1322 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1323 | }; |
55c022bb | 1324 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1325 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1326 | |
9cbb1750 | 1327 | struct blk_plug_cb; |
74018dc3 | 1328 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1329 | struct blk_plug_cb { |
1330 | struct list_head list; | |
9cbb1750 N |
1331 | blk_plug_cb_fn callback; |
1332 | void *data; | |
048c9374 | 1333 | }; |
9cbb1750 N |
1334 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1335 | void *data, int size); | |
73c10101 JA |
1336 | extern void blk_start_plug(struct blk_plug *); |
1337 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1338 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1339 | |
1340 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1341 | { | |
1342 | struct blk_plug *plug = tsk->plug; | |
1343 | ||
a237c1c5 JA |
1344 | if (plug) |
1345 | blk_flush_plug_list(plug, false); | |
1346 | } | |
1347 | ||
1348 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1349 | { | |
1350 | struct blk_plug *plug = tsk->plug; | |
1351 | ||
88b996cd | 1352 | if (plug) |
f6603783 | 1353 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1354 | } |
1355 | ||
1356 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1357 | { | |
1358 | struct blk_plug *plug = tsk->plug; | |
1359 | ||
320ae51f JA |
1360 | return plug && |
1361 | (!list_empty(&plug->list) || | |
1362 | !list_empty(&plug->mq_list) || | |
1363 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1364 | } |
1365 | ||
1da177e4 LT |
1366 | /* |
1367 | * tag stuff | |
1368 | */ | |
165125e1 JA |
1369 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1370 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1371 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1372 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1373 | extern void blk_queue_free_tags(struct request_queue *); |
1374 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
ee1b6f7a | 1375 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1376 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1377 | |
f583f492 DS |
1378 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1379 | int tag) | |
1380 | { | |
1381 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1382 | return NULL; | |
1383 | return bqt->tag_index[tag]; | |
1384 | } | |
dd3932ed | 1385 | |
ee472d83 CH |
1386 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1387 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
1388 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e950fdf7 CH |
1389 | |
1390 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
dd3932ed | 1391 | |
fbd9b09a DM |
1392 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1393 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1394 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1395 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1396 | struct bio **biop); |
ee472d83 CH |
1397 | |
1398 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ | |
cb365b96 | 1399 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
ee472d83 | 1400 | |
e73c23ff CK |
1401 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1402 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 1403 | unsigned flags); |
3f14d792 | 1404 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 CH |
1405 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1406 | ||
2cf6d26a CH |
1407 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1408 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1409 | { |
233bde21 BVA |
1410 | return blkdev_issue_discard(sb->s_bdev, |
1411 | block << (sb->s_blocksize_bits - | |
1412 | SECTOR_SHIFT), | |
1413 | nr_blocks << (sb->s_blocksize_bits - | |
1414 | SECTOR_SHIFT), | |
2cf6d26a | 1415 | gfp_mask, flags); |
fb2dce86 | 1416 | } |
e6fa0be6 | 1417 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1418 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1419 | { |
1420 | return blkdev_issue_zeroout(sb->s_bdev, | |
233bde21 BVA |
1421 | block << (sb->s_blocksize_bits - |
1422 | SECTOR_SHIFT), | |
1423 | nr_blocks << (sb->s_blocksize_bits - | |
1424 | SECTOR_SHIFT), | |
ee472d83 | 1425 | gfp_mask, 0); |
e6fa0be6 | 1426 | } |
1da177e4 | 1427 | |
f00c4d80 | 1428 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
0b07de85 | 1429 | |
eb28d31b MP |
1430 | enum blk_default_limits { |
1431 | BLK_MAX_SEGMENTS = 128, | |
1432 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1433 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1434 | BLK_MAX_SEGMENT_SIZE = 65536, |
1435 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1436 | }; | |
0e435ac2 | 1437 | |
ae03bf63 MP |
1438 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
1439 | { | |
025146e1 | 1440 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1441 | } |
1442 | ||
03100aad KB |
1443 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1444 | { | |
1445 | return q->limits.virt_boundary_mask; | |
1446 | } | |
1447 | ||
ae03bf63 MP |
1448 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1449 | { | |
025146e1 | 1450 | return q->limits.max_sectors; |
ae03bf63 MP |
1451 | } |
1452 | ||
1453 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1454 | { | |
025146e1 | 1455 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1456 | } |
1457 | ||
8a78362c | 1458 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1459 | { |
8a78362c | 1460 | return q->limits.max_segments; |
ae03bf63 MP |
1461 | } |
1462 | ||
1e739730 CH |
1463 | static inline unsigned short queue_max_discard_segments(struct request_queue *q) |
1464 | { | |
1465 | return q->limits.max_discard_segments; | |
1466 | } | |
1467 | ||
ae03bf63 MP |
1468 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
1469 | { | |
025146e1 | 1470 | return q->limits.max_segment_size; |
ae03bf63 MP |
1471 | } |
1472 | ||
e1defc4f | 1473 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1474 | { |
1475 | int retval = 512; | |
1476 | ||
025146e1 MP |
1477 | if (q && q->limits.logical_block_size) |
1478 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1479 | |
1480 | return retval; | |
1481 | } | |
1482 | ||
e1defc4f | 1483 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1484 | { |
e1defc4f | 1485 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1486 | } |
1487 | ||
c72758f3 MP |
1488 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1489 | { | |
1490 | return q->limits.physical_block_size; | |
1491 | } | |
1492 | ||
892b6f90 | 1493 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1494 | { |
1495 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1496 | } | |
1497 | ||
c72758f3 MP |
1498 | static inline unsigned int queue_io_min(struct request_queue *q) |
1499 | { | |
1500 | return q->limits.io_min; | |
1501 | } | |
1502 | ||
ac481c20 MP |
1503 | static inline int bdev_io_min(struct block_device *bdev) |
1504 | { | |
1505 | return queue_io_min(bdev_get_queue(bdev)); | |
1506 | } | |
1507 | ||
c72758f3 MP |
1508 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1509 | { | |
1510 | return q->limits.io_opt; | |
1511 | } | |
1512 | ||
ac481c20 MP |
1513 | static inline int bdev_io_opt(struct block_device *bdev) |
1514 | { | |
1515 | return queue_io_opt(bdev_get_queue(bdev)); | |
1516 | } | |
1517 | ||
c72758f3 MP |
1518 | static inline int queue_alignment_offset(struct request_queue *q) |
1519 | { | |
ac481c20 | 1520 | if (q->limits.misaligned) |
c72758f3 MP |
1521 | return -1; |
1522 | ||
ac481c20 | 1523 | return q->limits.alignment_offset; |
c72758f3 MP |
1524 | } |
1525 | ||
e03a72e1 | 1526 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1527 | { |
1528 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
233bde21 BVA |
1529 | unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) |
1530 | << SECTOR_SHIFT; | |
81744ee4 | 1531 | |
b8839b8c | 1532 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1533 | } |
1534 | ||
ac481c20 MP |
1535 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1536 | { | |
1537 | struct request_queue *q = bdev_get_queue(bdev); | |
1538 | ||
1539 | if (q->limits.misaligned) | |
1540 | return -1; | |
1541 | ||
1542 | if (bdev != bdev->bd_contains) | |
1543 | return bdev->bd_part->alignment_offset; | |
1544 | ||
1545 | return q->limits.alignment_offset; | |
1546 | } | |
1547 | ||
86b37281 MP |
1548 | static inline int queue_discard_alignment(struct request_queue *q) |
1549 | { | |
1550 | if (q->limits.discard_misaligned) | |
1551 | return -1; | |
1552 | ||
1553 | return q->limits.discard_alignment; | |
1554 | } | |
1555 | ||
e03a72e1 | 1556 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1557 | { |
59771079 | 1558 | unsigned int alignment, granularity, offset; |
dd3d145d | 1559 | |
a934a00a MP |
1560 | if (!lim->max_discard_sectors) |
1561 | return 0; | |
1562 | ||
59771079 | 1563 | /* Why are these in bytes, not sectors? */ |
233bde21 BVA |
1564 | alignment = lim->discard_alignment >> SECTOR_SHIFT; |
1565 | granularity = lim->discard_granularity >> SECTOR_SHIFT; | |
59771079 LT |
1566 | if (!granularity) |
1567 | return 0; | |
1568 | ||
1569 | /* Offset of the partition start in 'granularity' sectors */ | |
1570 | offset = sector_div(sector, granularity); | |
1571 | ||
1572 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1573 | offset = (granularity + alignment - offset) % granularity; | |
1574 | ||
1575 | /* Turn it back into bytes, gaah */ | |
233bde21 | 1576 | return offset << SECTOR_SHIFT; |
86b37281 MP |
1577 | } |
1578 | ||
c6e66634 PB |
1579 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1580 | { | |
1581 | struct request_queue *q = bdev_get_queue(bdev); | |
1582 | ||
1583 | if (bdev != bdev->bd_contains) | |
1584 | return bdev->bd_part->discard_alignment; | |
1585 | ||
1586 | return q->limits.discard_alignment; | |
1587 | } | |
1588 | ||
4363ac7c MP |
1589 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1590 | { | |
1591 | struct request_queue *q = bdev_get_queue(bdev); | |
1592 | ||
1593 | if (q) | |
1594 | return q->limits.max_write_same_sectors; | |
1595 | ||
1596 | return 0; | |
1597 | } | |
1598 | ||
a6f0788e CK |
1599 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1600 | { | |
1601 | struct request_queue *q = bdev_get_queue(bdev); | |
1602 | ||
1603 | if (q) | |
1604 | return q->limits.max_write_zeroes_sectors; | |
1605 | ||
1606 | return 0; | |
1607 | } | |
1608 | ||
797476b8 DLM |
1609 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1610 | { | |
1611 | struct request_queue *q = bdev_get_queue(bdev); | |
1612 | ||
1613 | if (q) | |
1614 | return blk_queue_zoned_model(q); | |
1615 | ||
1616 | return BLK_ZONED_NONE; | |
1617 | } | |
1618 | ||
1619 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1620 | { | |
1621 | struct request_queue *q = bdev_get_queue(bdev); | |
1622 | ||
1623 | if (q) | |
1624 | return blk_queue_is_zoned(q); | |
1625 | ||
1626 | return false; | |
1627 | } | |
1628 | ||
f99e8648 | 1629 | static inline unsigned int bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1630 | { |
1631 | struct request_queue *q = bdev_get_queue(bdev); | |
1632 | ||
1633 | if (q) | |
f99e8648 | 1634 | return blk_queue_zone_sectors(q); |
6cc77e9c CH |
1635 | return 0; |
1636 | } | |
6a0cb1bc | 1637 | |
165125e1 | 1638 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1639 | { |
482eb689 | 1640 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1641 | } |
1642 | ||
14417799 | 1643 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1644 | unsigned int len) |
1645 | { | |
1646 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1647 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1648 | } |
1649 | ||
1da177e4 LT |
1650 | /* assumes size > 256 */ |
1651 | static inline unsigned int blksize_bits(unsigned int size) | |
1652 | { | |
1653 | unsigned int bits = 8; | |
1654 | do { | |
1655 | bits++; | |
1656 | size >>= 1; | |
1657 | } while (size > 256); | |
1658 | return bits; | |
1659 | } | |
1660 | ||
2befb9e3 | 1661 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1662 | { |
1663 | return bdev->bd_block_size; | |
1664 | } | |
1665 | ||
f3876930 | 1666 | static inline bool queue_flush_queueable(struct request_queue *q) |
1667 | { | |
c888a8f9 | 1668 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1669 | } |
1670 | ||
1da177e4 LT |
1671 | typedef struct {struct page *v;} Sector; |
1672 | ||
1673 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1674 | ||
1675 | static inline void put_dev_sector(Sector p) | |
1676 | { | |
09cbfeaf | 1677 | put_page(p.v); |
1da177e4 LT |
1678 | } |
1679 | ||
59c3d45e | 1680 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1681 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
818cd1cb | 1682 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1683 | |
1da177e4 LT |
1684 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1685 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1686 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1687 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1688 | ||
7ba1ba12 MP |
1689 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1690 | ||
8288f496 MP |
1691 | enum blk_integrity_flags { |
1692 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1693 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1694 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1695 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1696 | }; |
7ba1ba12 | 1697 | |
18593088 | 1698 | struct blk_integrity_iter { |
7ba1ba12 MP |
1699 | void *prot_buf; |
1700 | void *data_buf; | |
3be91c4a | 1701 | sector_t seed; |
7ba1ba12 | 1702 | unsigned int data_size; |
3be91c4a | 1703 | unsigned short interval; |
7ba1ba12 MP |
1704 | const char *disk_name; |
1705 | }; | |
1706 | ||
4e4cbee9 | 1707 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1708 | |
0f8087ec MP |
1709 | struct blk_integrity_profile { |
1710 | integrity_processing_fn *generate_fn; | |
1711 | integrity_processing_fn *verify_fn; | |
1712 | const char *name; | |
1713 | }; | |
7ba1ba12 | 1714 | |
25520d55 | 1715 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1716 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1717 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1718 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1719 | struct scatterlist *); | |
1720 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1721 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1722 | struct request *); | |
1723 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1724 | struct bio *); | |
7ba1ba12 | 1725 | |
25520d55 | 1726 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1727 | { |
ac6fc48c | 1728 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1729 | |
1730 | if (!bi->profile) | |
1731 | return NULL; | |
1732 | ||
1733 | return bi; | |
b04accc4 JA |
1734 | } |
1735 | ||
25520d55 MP |
1736 | static inline |
1737 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1738 | { |
25520d55 | 1739 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1740 | } |
1741 | ||
180b2f95 | 1742 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1743 | { |
180b2f95 | 1744 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1745 | } |
1746 | ||
13f05c8d MP |
1747 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1748 | unsigned int segs) | |
1749 | { | |
1750 | q->limits.max_integrity_segments = segs; | |
1751 | } | |
1752 | ||
1753 | static inline unsigned short | |
1754 | queue_max_integrity_segments(struct request_queue *q) | |
1755 | { | |
1756 | return q->limits.max_integrity_segments; | |
1757 | } | |
1758 | ||
359f6427 GE |
1759 | /** |
1760 | * bio_integrity_intervals - Return number of integrity intervals for a bio | |
1761 | * @bi: blk_integrity profile for device | |
1762 | * @sectors: Size of the bio in 512-byte sectors | |
1763 | * | |
1764 | * Description: The block layer calculates everything in 512 byte | |
1765 | * sectors but integrity metadata is done in terms of the data integrity | |
1766 | * interval size of the storage device. Convert the block layer sectors | |
1767 | * to the appropriate number of integrity intervals. | |
1768 | */ | |
1769 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, | |
1770 | unsigned int sectors) | |
1771 | { | |
1772 | return sectors >> (bi->interval_exp - 9); | |
1773 | } | |
1774 | ||
1775 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1776 | unsigned int sectors) | |
1777 | { | |
1778 | return bio_integrity_intervals(bi, sectors) * bi->tuple_size; | |
1779 | } | |
1780 | ||
7ba1ba12 MP |
1781 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1782 | ||
fd83240a SR |
1783 | struct bio; |
1784 | struct block_device; | |
1785 | struct gendisk; | |
1786 | struct blk_integrity; | |
1787 | ||
1788 | static inline int blk_integrity_rq(struct request *rq) | |
1789 | { | |
1790 | return 0; | |
1791 | } | |
1792 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1793 | struct bio *b) | |
1794 | { | |
1795 | return 0; | |
1796 | } | |
1797 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1798 | struct bio *b, | |
1799 | struct scatterlist *s) | |
1800 | { | |
1801 | return 0; | |
1802 | } | |
1803 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1804 | { | |
61a04e5b | 1805 | return NULL; |
fd83240a SR |
1806 | } |
1807 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1808 | { | |
1809 | return NULL; | |
1810 | } | |
1811 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1812 | { | |
1813 | return 0; | |
1814 | } | |
25520d55 | 1815 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1816 | struct blk_integrity *b) |
1817 | { | |
fd83240a SR |
1818 | } |
1819 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1820 | { | |
1821 | } | |
1822 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1823 | unsigned int segs) | |
1824 | { | |
1825 | } | |
1826 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1827 | { | |
1828 | return 0; | |
1829 | } | |
4eaf99be MP |
1830 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1831 | struct request *r1, | |
1832 | struct request *r2) | |
fd83240a | 1833 | { |
cb1a5ab6 | 1834 | return true; |
fd83240a | 1835 | } |
4eaf99be MP |
1836 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1837 | struct request *r, | |
1838 | struct bio *b) | |
fd83240a | 1839 | { |
cb1a5ab6 | 1840 | return true; |
fd83240a | 1841 | } |
25520d55 | 1842 | |
359f6427 GE |
1843 | static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, |
1844 | unsigned int sectors) | |
1845 | { | |
1846 | return 0; | |
1847 | } | |
1848 | ||
1849 | static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, | |
1850 | unsigned int sectors) | |
1851 | { | |
1852 | return 0; | |
1853 | } | |
1854 | ||
7ba1ba12 MP |
1855 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
1856 | ||
08f85851 | 1857 | struct block_device_operations { |
d4430d62 | 1858 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1859 | void (*release) (struct gendisk *, fmode_t); |
3f289dcb | 1860 | int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); |
d4430d62 AV |
1861 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1862 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
77ea887e TH |
1863 | unsigned int (*check_events) (struct gendisk *disk, |
1864 | unsigned int clearing); | |
1865 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1866 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1867 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1868 | int (*revalidate_disk) (struct gendisk *); |
1869 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1870 | /* this callback is with swap_lock and sometimes page table lock held */ |
1871 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
e76239a3 CH |
1872 | int (*report_zones)(struct gendisk *, sector_t sector, |
1873 | struct blk_zone *zones, unsigned int *nr_zones, | |
1874 | gfp_t gfp_mask); | |
08f85851 | 1875 | struct module *owner; |
bbd3e064 | 1876 | const struct pr_ops *pr_ops; |
08f85851 AV |
1877 | }; |
1878 | ||
633a08b8 AV |
1879 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1880 | unsigned long); | |
47a191fd MW |
1881 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1882 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1883 | struct writeback_control *); | |
6cc77e9c CH |
1884 | |
1885 | #ifdef CONFIG_BLK_DEV_ZONED | |
1886 | bool blk_req_needs_zone_write_lock(struct request *rq); | |
1887 | void __blk_req_zone_write_lock(struct request *rq); | |
1888 | void __blk_req_zone_write_unlock(struct request *rq); | |
1889 | ||
1890 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1891 | { | |
1892 | if (blk_req_needs_zone_write_lock(rq)) | |
1893 | __blk_req_zone_write_lock(rq); | |
1894 | } | |
1895 | ||
1896 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1897 | { | |
1898 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) | |
1899 | __blk_req_zone_write_unlock(rq); | |
1900 | } | |
1901 | ||
1902 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1903 | { | |
1904 | return rq->q->seq_zones_wlock && | |
1905 | test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); | |
1906 | } | |
1907 | ||
1908 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1909 | { | |
1910 | if (!blk_req_needs_zone_write_lock(rq)) | |
1911 | return true; | |
1912 | return !blk_req_zone_is_write_locked(rq); | |
1913 | } | |
1914 | #else | |
1915 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) | |
1916 | { | |
1917 | return false; | |
1918 | } | |
1919 | ||
1920 | static inline void blk_req_zone_write_lock(struct request *rq) | |
1921 | { | |
1922 | } | |
1923 | ||
1924 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
1925 | { | |
1926 | } | |
1927 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
1928 | { | |
1929 | return false; | |
1930 | } | |
1931 | ||
1932 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
1933 | { | |
1934 | return true; | |
1935 | } | |
1936 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
1937 | ||
9361401e | 1938 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1939 | |
1940 | struct block_device; | |
1941 | ||
9361401e DH |
1942 | /* |
1943 | * stubs for when the block layer is configured out | |
1944 | */ | |
1945 | #define buffer_heads_over_limit 0 | |
1946 | ||
9361401e DH |
1947 | static inline long nr_blockdev_pages(void) |
1948 | { | |
1949 | return 0; | |
1950 | } | |
1951 | ||
1f940bdf JA |
1952 | struct blk_plug { |
1953 | }; | |
1954 | ||
1955 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1956 | { |
1957 | } | |
1958 | ||
1f940bdf | 1959 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1960 | { |
1961 | } | |
1962 | ||
1f940bdf | 1963 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1964 | { |
1965 | } | |
1966 | ||
a237c1c5 JA |
1967 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1968 | { | |
1969 | } | |
1970 | ||
1971 | ||
73c10101 JA |
1972 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1973 | { | |
1974 | return false; | |
1975 | } | |
1976 | ||
ac13a829 FF |
1977 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
1978 | sector_t *error_sector) | |
1979 | { | |
1980 | return 0; | |
1981 | } | |
1982 | ||
9361401e DH |
1983 | #endif /* CONFIG_BLOCK */ |
1984 | ||
1da177e4 | 1985 | #endif |