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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> |
1d9bd516 TH |
30 | #include <linux/seqlock.h> |
31 | #include <linux/u64_stats_sync.h> | |
1da177e4 | 32 | |
de477254 | 33 | struct module; |
21b2f0c8 CH |
34 | struct scsi_ioctl_command; |
35 | ||
1da177e4 | 36 | struct request_queue; |
1da177e4 | 37 | struct elevator_queue; |
2056a782 | 38 | struct blk_trace; |
3d6392cf JA |
39 | struct request; |
40 | struct sg_io_hdr; | |
aa387cc8 | 41 | struct bsg_job; |
3c798398 | 42 | struct blkcg_gq; |
7c94e1c1 | 43 | struct blk_flush_queue; |
bbd3e064 | 44 | struct pr_ops; |
87760e5e | 45 | struct rq_wb; |
34dbad5d OS |
46 | struct blk_queue_stats; |
47 | struct blk_stat_callback; | |
1da177e4 LT |
48 | |
49 | #define BLKDEV_MIN_RQ 4 | |
50 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
51 | ||
096392e0 | 52 | /* Must be consistent with blk_mq_poll_stats_bkt() */ |
0206319f SB |
53 | #define BLK_MQ_POLL_STATS_BKTS 16 |
54 | ||
8bd435b3 TH |
55 | /* |
56 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
57 | * Defined here to simplify include dependency. | |
58 | */ | |
e21b7a0b | 59 | #define BLKCG_MAX_POLS 3 |
8bd435b3 | 60 | |
2a842aca | 61 | typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
1da177e4 | 62 | |
5b788ce3 TH |
63 | #define BLK_RL_SYNCFULL (1U << 0) |
64 | #define BLK_RL_ASYNCFULL (1U << 1) | |
65 | ||
1da177e4 | 66 | struct request_list { |
5b788ce3 | 67 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
68 | #ifdef CONFIG_BLK_CGROUP |
69 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
70 | #endif | |
1faa16d2 JA |
71 | /* |
72 | * count[], starved[], and wait[] are indexed by | |
73 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
74 | */ | |
8a5ecdd4 TH |
75 | int count[2]; |
76 | int starved[2]; | |
77 | mempool_t *rq_pool; | |
78 | wait_queue_head_t wait[2]; | |
5b788ce3 | 79 | unsigned int flags; |
1da177e4 LT |
80 | }; |
81 | ||
e8064021 CH |
82 | /* |
83 | * request flags */ | |
84 | typedef __u32 __bitwise req_flags_t; | |
85 | ||
86 | /* elevator knows about this request */ | |
87 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
88 | /* drive already may have started this one */ | |
89 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
90 | /* uses tagged queueing */ | |
91 | #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) | |
92 | /* may not be passed by ioscheduler */ | |
93 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
94 | /* request for flush sequence */ | |
95 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
96 | /* merge of different types, fail separately */ | |
97 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
98 | /* track inflight for MQ */ | |
99 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
100 | /* don't call prep for this one */ | |
101 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
102 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
103 | "quiesce" state must be ignored. */ | |
104 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
105 | /* contains copies of user pages */ | |
106 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
107 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
108 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
109 | /* don't warn about errors */ | |
110 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
111 | /* elevator private data attached */ | |
112 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
113 | /* account I/O stat */ | |
114 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) | |
115 | /* request came from our alloc pool */ | |
116 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
117 | /* runtime pm request */ | |
118 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
119 | /* on IO scheduler merge hash */ | |
120 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
cf43e6be JA |
121 | /* IO stats tracking on */ |
122 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) | |
f9d03f96 CH |
123 | /* Look at ->special_vec for the actual data payload instead of the |
124 | bio chain. */ | |
125 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
6cc77e9c CH |
126 | /* The per-zone write lock is held for this request */ |
127 | #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) | |
634f9e46 TH |
128 | /* timeout is expired */ |
129 | #define RQF_MQ_TIMEOUT_EXPIRED ((__force req_flags_t)(1 << 20)) | |
76a86f9d JA |
130 | /* already slept for hybrid poll */ |
131 | #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 21)) | |
e8064021 CH |
132 | |
133 | /* flags that prevent us from merging requests: */ | |
134 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 135 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 136 | |
1da177e4 | 137 | /* |
af76e555 CH |
138 | * Try to put the fields that are referenced together in the same cacheline. |
139 | * | |
140 | * If you modify this structure, make sure to update blk_rq_init() and | |
141 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
142 | */ |
143 | struct request { | |
165125e1 | 144 | struct request_queue *q; |
320ae51f | 145 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 146 | |
ca93e453 | 147 | int cpu; |
ef295ecf | 148 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 149 | req_flags_t rq_flags; |
d486f1f2 JA |
150 | |
151 | int internal_tag; | |
152 | ||
a2dec7b3 | 153 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 154 | unsigned int __data_len; /* total data len */ |
bd166ef1 | 155 | int tag; |
181fdde3 | 156 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
157 | |
158 | struct bio *bio; | |
159 | struct bio *biotail; | |
160 | ||
7c3fb70f JA |
161 | struct list_head queuelist; |
162 | ||
360f92c2 JA |
163 | /* |
164 | * The hash is used inside the scheduler, and killed once the | |
165 | * request reaches the dispatch list. The ipi_list is only used | |
166 | * to queue the request for softirq completion, which is long | |
167 | * after the request has been unhashed (and even removed from | |
168 | * the dispatch list). | |
169 | */ | |
170 | union { | |
171 | struct hlist_node hash; /* merge hash */ | |
172 | struct list_head ipi_list; | |
173 | }; | |
174 | ||
e6a1c874 JA |
175 | /* |
176 | * The rb_node is only used inside the io scheduler, requests | |
177 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 178 | * completion_data share space with the rb_node. |
e6a1c874 JA |
179 | */ |
180 | union { | |
181 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 182 | struct bio_vec special_vec; |
c186794d | 183 | void *completion_data; |
e26738e0 | 184 | int error_count; /* for legacy drivers, don't use */ |
e6a1c874 | 185 | }; |
9817064b | 186 | |
ff7d145f | 187 | /* |
7f1dc8a2 | 188 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
189 | * more they have to dynamically allocate it. Flush requests are |
190 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 191 | * space with the elevator data. |
ff7d145f | 192 | */ |
c186794d | 193 | union { |
a612fddf TH |
194 | struct { |
195 | struct io_cq *icq; | |
196 | void *priv[2]; | |
197 | } elv; | |
198 | ||
c186794d MS |
199 | struct { |
200 | unsigned int seq; | |
201 | struct list_head list; | |
4853abaa | 202 | rq_end_io_fn *saved_end_io; |
c186794d MS |
203 | } flush; |
204 | }; | |
ff7d145f | 205 | |
8f34ee75 | 206 | struct gendisk *rq_disk; |
09e099d4 | 207 | struct hd_struct *part; |
1da177e4 | 208 | unsigned long start_time; |
cf43e6be | 209 | struct blk_issue_stat issue_stat; |
1da177e4 LT |
210 | /* Number of scatter-gather DMA addr+len pairs after |
211 | * physical address coalescing is performed. | |
212 | */ | |
213 | unsigned short nr_phys_segments; | |
7c3fb70f | 214 | |
13f05c8d MP |
215 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
216 | unsigned short nr_integrity_segments; | |
217 | #endif | |
1da177e4 | 218 | |
7c3fb70f | 219 | unsigned short write_hint; |
8f34ee75 JA |
220 | unsigned short ioprio; |
221 | ||
1dd5198b | 222 | unsigned int timeout; |
1da177e4 | 223 | |
731ec497 | 224 | void *special; /* opaque pointer available for LLD use */ |
cdd60262 | 225 | |
7a85f889 | 226 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 227 | |
1d9bd516 TH |
228 | /* |
229 | * On blk-mq, the lower bits of ->gstate (generation number and | |
230 | * state) carry the MQ_RQ_* state value and the upper bits the | |
231 | * generation number which is monotonically incremented and used to | |
232 | * distinguish the reuse instances. | |
233 | * | |
234 | * ->gstate_seq allows updates to ->gstate and other fields | |
235 | * (currently ->deadline) during request start to be read | |
236 | * atomically from the timeout path, so that it can operate on a | |
237 | * coherent set of information. | |
238 | */ | |
239 | seqcount_t gstate_seq; | |
240 | u64 gstate; | |
241 | ||
242 | /* | |
243 | * ->aborted_gstate is used by the timeout to claim a specific | |
244 | * recycle instance of this request. See blk_mq_timeout_work(). | |
245 | */ | |
246 | struct u64_stats_sync aborted_gstate_sync; | |
247 | u64 aborted_gstate; | |
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 */ | |
270 | unsigned long long start_time_ns; | |
271 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
272 | #endif | |
1da177e4 LT |
273 | }; |
274 | ||
14cb0dc6 ML |
275 | static inline bool blk_op_is_scsi(unsigned int op) |
276 | { | |
277 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; | |
278 | } | |
279 | ||
280 | static inline bool blk_op_is_private(unsigned int op) | |
281 | { | |
282 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; | |
283 | } | |
284 | ||
aebf526b CH |
285 | static inline bool blk_rq_is_scsi(struct request *rq) |
286 | { | |
14cb0dc6 | 287 | return blk_op_is_scsi(req_op(rq)); |
aebf526b CH |
288 | } |
289 | ||
290 | static inline bool blk_rq_is_private(struct request *rq) | |
291 | { | |
14cb0dc6 | 292 | return blk_op_is_private(req_op(rq)); |
aebf526b CH |
293 | } |
294 | ||
57292b58 CH |
295 | static inline bool blk_rq_is_passthrough(struct request *rq) |
296 | { | |
aebf526b | 297 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
298 | } |
299 | ||
14cb0dc6 ML |
300 | static inline bool bio_is_passthrough(struct bio *bio) |
301 | { | |
302 | unsigned op = bio_op(bio); | |
303 | ||
304 | return blk_op_is_scsi(op) || blk_op_is_private(op); | |
305 | } | |
306 | ||
766ca442 FLVC |
307 | static inline unsigned short req_get_ioprio(struct request *req) |
308 | { | |
309 | return req->ioprio; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | #include <linux/elevator.h> |
313 | ||
320ae51f JA |
314 | struct blk_queue_ctx; |
315 | ||
165125e1 | 316 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 317 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
ea435e1b | 318 | typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); |
165125e1 | 319 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 320 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
321 | |
322 | struct bio_vec; | |
ff856bad | 323 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 324 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 325 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 326 | typedef int (bsg_job_fn) (struct bsg_job *); |
6d247d7f CH |
327 | typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t); |
328 | typedef void (exit_rq_fn)(struct request_queue *, struct request *); | |
1da177e4 | 329 | |
242f9dcb JA |
330 | enum blk_eh_timer_return { |
331 | BLK_EH_NOT_HANDLED, | |
332 | BLK_EH_HANDLED, | |
333 | BLK_EH_RESET_TIMER, | |
334 | }; | |
335 | ||
336 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
337 | ||
1da177e4 LT |
338 | enum blk_queue_state { |
339 | Queue_down, | |
340 | Queue_up, | |
341 | }; | |
342 | ||
1da177e4 LT |
343 | struct blk_queue_tag { |
344 | struct request **tag_index; /* map of busy tags */ | |
345 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 | 346 | int max_depth; /* what we will send to device */ |
ba025082 | 347 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 348 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
349 | int alloc_policy; /* tag allocation policy */ |
350 | int next_tag; /* next tag */ | |
1da177e4 | 351 | }; |
ee1b6f7a SL |
352 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
353 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 354 | |
abf54393 FT |
355 | #define BLK_SCSI_MAX_CMDS (256) |
356 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
357 | ||
797476b8 DLM |
358 | /* |
359 | * Zoned block device models (zoned limit). | |
360 | */ | |
361 | enum blk_zoned_model { | |
362 | BLK_ZONED_NONE, /* Regular block device */ | |
363 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
364 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
365 | }; | |
366 | ||
025146e1 MP |
367 | struct queue_limits { |
368 | unsigned long bounce_pfn; | |
369 | unsigned long seg_boundary_mask; | |
03100aad | 370 | unsigned long virt_boundary_mask; |
025146e1 MP |
371 | |
372 | unsigned int max_hw_sectors; | |
ca369d51 | 373 | unsigned int max_dev_sectors; |
762380ad | 374 | unsigned int chunk_sectors; |
025146e1 MP |
375 | unsigned int max_sectors; |
376 | unsigned int max_segment_size; | |
c72758f3 MP |
377 | unsigned int physical_block_size; |
378 | unsigned int alignment_offset; | |
379 | unsigned int io_min; | |
380 | unsigned int io_opt; | |
67efc925 | 381 | unsigned int max_discard_sectors; |
0034af03 | 382 | unsigned int max_hw_discard_sectors; |
4363ac7c | 383 | unsigned int max_write_same_sectors; |
a6f0788e | 384 | unsigned int max_write_zeroes_sectors; |
86b37281 MP |
385 | unsigned int discard_granularity; |
386 | unsigned int discard_alignment; | |
025146e1 MP |
387 | |
388 | unsigned short logical_block_size; | |
8a78362c | 389 | unsigned short max_segments; |
13f05c8d | 390 | unsigned short max_integrity_segments; |
1e739730 | 391 | unsigned short max_discard_segments; |
025146e1 | 392 | |
c72758f3 | 393 | unsigned char misaligned; |
86b37281 | 394 | unsigned char discard_misaligned; |
e692cb66 | 395 | unsigned char cluster; |
c78afc62 | 396 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 397 | enum blk_zoned_model zoned; |
025146e1 MP |
398 | }; |
399 | ||
6a0cb1bc HR |
400 | #ifdef CONFIG_BLK_DEV_ZONED |
401 | ||
402 | struct blk_zone_report_hdr { | |
403 | unsigned int nr_zones; | |
404 | u8 padding[60]; | |
405 | }; | |
406 | ||
407 | extern int blkdev_report_zones(struct block_device *bdev, | |
408 | sector_t sector, struct blk_zone *zones, | |
409 | unsigned int *nr_zones, gfp_t gfp_mask); | |
410 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
411 | sector_t nr_sectors, gfp_t gfp_mask); | |
412 | ||
3ed05a98 ST |
413 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
414 | unsigned int cmd, unsigned long arg); | |
415 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
416 | unsigned int cmd, unsigned long arg); | |
417 | ||
418 | #else /* CONFIG_BLK_DEV_ZONED */ | |
419 | ||
420 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, | |
421 | fmode_t mode, unsigned int cmd, | |
422 | unsigned long arg) | |
423 | { | |
424 | return -ENOTTY; | |
425 | } | |
426 | ||
427 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
428 | fmode_t mode, unsigned int cmd, | |
429 | unsigned long arg) | |
430 | { | |
431 | return -ENOTTY; | |
432 | } | |
433 | ||
6a0cb1bc HR |
434 | #endif /* CONFIG_BLK_DEV_ZONED */ |
435 | ||
d7b76301 | 436 | struct request_queue { |
1da177e4 LT |
437 | /* |
438 | * Together with queue_head for cacheline sharing | |
439 | */ | |
440 | struct list_head queue_head; | |
441 | struct request *last_merge; | |
b374d18a | 442 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
443 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
444 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 | 445 | |
8e8320c9 JA |
446 | atomic_t shared_hctx_restart; |
447 | ||
34dbad5d | 448 | struct blk_queue_stats *stats; |
87760e5e JA |
449 | struct rq_wb *rq_wb; |
450 | ||
1da177e4 | 451 | /* |
a051661c TH |
452 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
453 | * is used, root blkg allocates from @q->root_rl and all other | |
454 | * blkgs from their own blkg->rl. Which one to use should be | |
455 | * determined using bio_request_list(). | |
1da177e4 | 456 | */ |
a051661c | 457 | struct request_list root_rl; |
1da177e4 LT |
458 | |
459 | request_fn_proc *request_fn; | |
1da177e4 | 460 | make_request_fn *make_request_fn; |
ea435e1b | 461 | poll_q_fn *poll_fn; |
1da177e4 | 462 | prep_rq_fn *prep_rq_fn; |
28018c24 | 463 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 464 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 465 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 466 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 467 | lld_busy_fn *lld_busy_fn; |
d280bab3 | 468 | /* Called just after a request is allocated */ |
6d247d7f | 469 | init_rq_fn *init_rq_fn; |
d280bab3 | 470 | /* Called just before a request is freed */ |
6d247d7f | 471 | exit_rq_fn *exit_rq_fn; |
d280bab3 BVA |
472 | /* Called from inside blk_get_request() */ |
473 | void (*initialize_rq_fn)(struct request *rq); | |
1da177e4 | 474 | |
f8a5b122 | 475 | const struct blk_mq_ops *mq_ops; |
320ae51f JA |
476 | |
477 | unsigned int *mq_map; | |
478 | ||
479 | /* sw queues */ | |
e6cdb092 | 480 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
481 | unsigned int nr_queues; |
482 | ||
d278d4a8 JA |
483 | unsigned int queue_depth; |
484 | ||
320ae51f JA |
485 | /* hw dispatch queues */ |
486 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
487 | unsigned int nr_hw_queues; | |
488 | ||
8922e16c TH |
489 | /* |
490 | * Dispatch queue sorting | |
491 | */ | |
1b47f531 | 492 | sector_t end_sector; |
8922e16c | 493 | struct request *boundary_rq; |
8922e16c | 494 | |
1da177e4 | 495 | /* |
3cca6dc1 | 496 | * Delayed queue handling |
1da177e4 | 497 | */ |
3cca6dc1 | 498 | struct delayed_work delay_work; |
1da177e4 | 499 | |
dc3b17cc | 500 | struct backing_dev_info *backing_dev_info; |
1da177e4 LT |
501 | |
502 | /* | |
503 | * The queue owner gets to use this for whatever they like. | |
504 | * ll_rw_blk doesn't touch it. | |
505 | */ | |
506 | void *queuedata; | |
507 | ||
1da177e4 | 508 | /* |
d7b76301 | 509 | * various queue flags, see QUEUE_* below |
1da177e4 | 510 | */ |
d7b76301 | 511 | unsigned long queue_flags; |
1da177e4 | 512 | |
a73f730d TH |
513 | /* |
514 | * ida allocated id for this queue. Used to index queues from | |
515 | * ioctx. | |
516 | */ | |
517 | int id; | |
518 | ||
1da177e4 | 519 | /* |
d7b76301 | 520 | * queue needs bounce pages for pages above this limit |
1da177e4 | 521 | */ |
d7b76301 | 522 | gfp_t bounce_gfp; |
1da177e4 LT |
523 | |
524 | /* | |
152587de JA |
525 | * protects queue structures from reentrancy. ->__queue_lock should |
526 | * _never_ be used directly, it is queue private. always use | |
527 | * ->queue_lock. | |
1da177e4 | 528 | */ |
152587de | 529 | spinlock_t __queue_lock; |
1da177e4 LT |
530 | spinlock_t *queue_lock; |
531 | ||
532 | /* | |
533 | * queue kobject | |
534 | */ | |
535 | struct kobject kobj; | |
536 | ||
320ae51f JA |
537 | /* |
538 | * mq queue kobject | |
539 | */ | |
540 | struct kobject mq_kobj; | |
541 | ||
ac6fc48c DW |
542 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
543 | struct blk_integrity integrity; | |
544 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
545 | ||
47fafbc7 | 546 | #ifdef CONFIG_PM |
6c954667 LM |
547 | struct device *dev; |
548 | int rpm_status; | |
549 | unsigned int nr_pending; | |
550 | #endif | |
551 | ||
1da177e4 LT |
552 | /* |
553 | * queue settings | |
554 | */ | |
555 | unsigned long nr_requests; /* Max # of requests */ | |
556 | unsigned int nr_congestion_on; | |
557 | unsigned int nr_congestion_off; | |
558 | unsigned int nr_batching; | |
559 | ||
fa0ccd83 | 560 | unsigned int dma_drain_size; |
d7b76301 | 561 | void *dma_drain_buffer; |
e3790c7d | 562 | unsigned int dma_pad_mask; |
1da177e4 LT |
563 | unsigned int dma_alignment; |
564 | ||
565 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 566 | struct list_head tag_busy_list; |
1da177e4 | 567 | |
15853af9 | 568 | unsigned int nr_sorted; |
0a7ae2ff | 569 | unsigned int in_flight[2]; |
cf43e6be | 570 | |
24faf6f6 BVA |
571 | /* |
572 | * Number of active block driver functions for which blk_drain_queue() | |
573 | * must wait. Must be incremented around functions that unlock the | |
574 | * queue_lock internally, e.g. scsi_request_fn(). | |
575 | */ | |
576 | unsigned int request_fn_active; | |
1da177e4 | 577 | |
242f9dcb | 578 | unsigned int rq_timeout; |
64f1c21e | 579 | int poll_nsec; |
34dbad5d OS |
580 | |
581 | struct blk_stat_callback *poll_cb; | |
0206319f | 582 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
34dbad5d | 583 | |
242f9dcb | 584 | struct timer_list timeout; |
287922eb | 585 | struct work_struct timeout_work; |
242f9dcb JA |
586 | struct list_head timeout_list; |
587 | ||
a612fddf | 588 | struct list_head icq_list; |
4eef3049 | 589 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 590 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 591 | struct blkcg_gq *root_blkg; |
03aa264a | 592 | struct list_head blkg_list; |
4eef3049 | 593 | #endif |
a612fddf | 594 | |
025146e1 MP |
595 | struct queue_limits limits; |
596 | ||
6cc77e9c CH |
597 | /* |
598 | * Zoned block device information for request dispatch control. | |
599 | * nr_zones is the total number of zones of the device. This is always | |
600 | * 0 for regular block devices. seq_zones_bitmap is a bitmap of nr_zones | |
601 | * bits which indicates if a zone is conventional (bit clear) or | |
602 | * sequential (bit set). seq_zones_wlock is a bitmap of nr_zones | |
603 | * bits which indicates if a zone is write locked, that is, if a write | |
604 | * request targeting the zone was dispatched. All three fields are | |
605 | * initialized by the low level device driver (e.g. scsi/sd.c). | |
606 | * Stacking drivers (device mappers) may or may not initialize | |
607 | * these fields. | |
608 | */ | |
609 | unsigned int nr_zones; | |
610 | unsigned long *seq_zones_bitmap; | |
611 | unsigned long *seq_zones_wlock; | |
612 | ||
1da177e4 LT |
613 | /* |
614 | * sg stuff | |
615 | */ | |
616 | unsigned int sg_timeout; | |
617 | unsigned int sg_reserved_size; | |
1946089a | 618 | int node; |
6c5c9341 | 619 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 620 | struct blk_trace *blk_trace; |
5acb3cc2 | 621 | struct mutex blk_trace_mutex; |
6c5c9341 | 622 | #endif |
1da177e4 | 623 | /* |
4913efe4 | 624 | * for flush operations |
1da177e4 | 625 | */ |
7c94e1c1 | 626 | struct blk_flush_queue *fq; |
483f4afc | 627 | |
6fca6a61 CH |
628 | struct list_head requeue_list; |
629 | spinlock_t requeue_lock; | |
2849450a | 630 | struct delayed_work requeue_work; |
6fca6a61 | 631 | |
483f4afc | 632 | struct mutex sysfs_lock; |
d351af01 | 633 | |
d732580b | 634 | int bypass_depth; |
4ecd4fef | 635 | atomic_t mq_freeze_depth; |
d732580b | 636 | |
d351af01 | 637 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 | 638 | bsg_job_fn *bsg_job_fn; |
d351af01 FT |
639 | struct bsg_class_device bsg_dev; |
640 | #endif | |
e43473b7 VG |
641 | |
642 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
643 | /* Throttle data */ | |
644 | struct throtl_data *td; | |
645 | #endif | |
548bc8e1 | 646 | struct rcu_head rcu_head; |
320ae51f | 647 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 648 | struct percpu_ref q_usage_counter; |
320ae51f | 649 | struct list_head all_q_node; |
0d2602ca JA |
650 | |
651 | struct blk_mq_tag_set *tag_set; | |
652 | struct list_head tag_set_list; | |
54efd50b | 653 | struct bio_set *bio_split; |
4593fdbe | 654 | |
03796c14 | 655 | #ifdef CONFIG_BLK_DEBUG_FS |
07e4fead | 656 | struct dentry *debugfs_dir; |
d332ce09 | 657 | struct dentry *sched_debugfs_dir; |
07e4fead OS |
658 | #endif |
659 | ||
4593fdbe | 660 | bool mq_sysfs_init_done; |
6d247d7f CH |
661 | |
662 | size_t cmd_size; | |
663 | void *rq_alloc_data; | |
dc9edc44 BVA |
664 | |
665 | struct work_struct release_work; | |
f793dfd3 JA |
666 | |
667 | #define BLK_MAX_WRITE_HINTS 5 | |
668 | u64 write_hints[BLK_MAX_WRITE_HINTS]; | |
1da177e4 LT |
669 | }; |
670 | ||
e743eb1e JA |
671 | #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */ |
672 | #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */ | |
673 | #define QUEUE_FLAG_DYING 2 /* queue being torn down */ | |
674 | #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */ | |
675 | #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */ | |
676 | #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */ | |
677 | #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */ | |
678 | #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */ | |
e743eb1e | 679 | #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */ |
88e740f1 | 680 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
e743eb1e JA |
681 | #define QUEUE_FLAG_IO_STAT 10 /* do IO stats */ |
682 | #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */ | |
683 | #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */ | |
684 | #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */ | |
685 | #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */ | |
686 | #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */ | |
687 | #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */ | |
688 | #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */ | |
689 | #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/ | |
690 | #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */ | |
691 | #define QUEUE_FLAG_WC 20 /* Write back caching */ | |
692 | #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */ | |
693 | #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */ | |
694 | #define QUEUE_FLAG_DAX 23 /* device supports DAX */ | |
695 | #define QUEUE_FLAG_STATS 24 /* track rq completion times */ | |
696 | #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */ | |
697 | #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ | |
698 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ | |
699 | #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ | |
c9254f2d | 700 | #define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ |
bc58ba94 JA |
701 | |
702 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
e2e1a148 JA |
703 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
704 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 705 | |
94eddfbe | 706 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
8e0b60b9 CH |
707 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
708 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 709 | |
9e0c8299 BVA |
710 | /* |
711 | * @q->queue_lock is set while a queue is being initialized. Since we know | |
712 | * that no other threads access the queue object before @q->queue_lock has | |
713 | * been set, it is safe to manipulate queue flags without holding the | |
714 | * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and | |
715 | * blk_init_allocated_queue(). | |
716 | */ | |
8bcb6c7d | 717 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 718 | { |
8bcb6c7d AK |
719 | if (q->queue_lock) |
720 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
721 | } |
722 | ||
75ad23bc NP |
723 | static inline void queue_flag_set_unlocked(unsigned int flag, |
724 | struct request_queue *q) | |
725 | { | |
726 | __set_bit(flag, &q->queue_flags); | |
727 | } | |
728 | ||
e48ec690 JA |
729 | static inline int queue_flag_test_and_clear(unsigned int flag, |
730 | struct request_queue *q) | |
731 | { | |
8bcb6c7d | 732 | queue_lockdep_assert_held(q); |
e48ec690 JA |
733 | |
734 | if (test_bit(flag, &q->queue_flags)) { | |
735 | __clear_bit(flag, &q->queue_flags); | |
736 | return 1; | |
737 | } | |
738 | ||
739 | return 0; | |
740 | } | |
741 | ||
742 | static inline int queue_flag_test_and_set(unsigned int flag, | |
743 | struct request_queue *q) | |
744 | { | |
8bcb6c7d | 745 | queue_lockdep_assert_held(q); |
e48ec690 JA |
746 | |
747 | if (!test_bit(flag, &q->queue_flags)) { | |
748 | __set_bit(flag, &q->queue_flags); | |
749 | return 0; | |
750 | } | |
751 | ||
752 | return 1; | |
753 | } | |
754 | ||
75ad23bc NP |
755 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
756 | { | |
8bcb6c7d | 757 | queue_lockdep_assert_held(q); |
75ad23bc NP |
758 | __set_bit(flag, &q->queue_flags); |
759 | } | |
760 | ||
761 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
762 | struct request_queue *q) | |
763 | { | |
764 | __clear_bit(flag, &q->queue_flags); | |
765 | } | |
766 | ||
0a7ae2ff JA |
767 | static inline int queue_in_flight(struct request_queue *q) |
768 | { | |
769 | return q->in_flight[0] + q->in_flight[1]; | |
770 | } | |
771 | ||
75ad23bc NP |
772 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
773 | { | |
8bcb6c7d | 774 | queue_lockdep_assert_held(q); |
75ad23bc NP |
775 | __clear_bit(flag, &q->queue_flags); |
776 | } | |
777 | ||
1da177e4 LT |
778 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
779 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 780 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 781 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 782 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 783 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 784 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
785 | #define blk_queue_noxmerges(q) \ |
786 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 787 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 788 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 789 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
c15227de | 790 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
791 | #define blk_queue_secure_erase(q) \ |
792 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 793 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
9efc160f BVA |
794 | #define blk_queue_scsi_passthrough(q) \ |
795 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) | |
1da177e4 | 796 | |
33659ebb CH |
797 | #define blk_noretry_request(rq) \ |
798 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
799 | REQ_FAILFAST_DRIVER)) | |
f4560ffe | 800 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
c9254f2d BVA |
801 | #define blk_queue_preempt_only(q) \ |
802 | test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) | |
803 | ||
804 | extern int blk_set_preempt_only(struct request_queue *q); | |
805 | extern void blk_clear_preempt_only(struct request_queue *q); | |
33659ebb | 806 | |
57292b58 CH |
807 | static inline bool blk_account_rq(struct request *rq) |
808 | { | |
809 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
810 | } | |
33659ebb | 811 | |
ab780f1e | 812 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 813 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
814 | /* rq->queuelist of dequeued request must be list_empty() */ |
815 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
816 | |
817 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
818 | ||
4e1b2d52 | 819 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 820 | |
49fd524f JA |
821 | /* |
822 | * Driver can handle struct request, if it either has an old style | |
823 | * request_fn defined, or is blk-mq based. | |
824 | */ | |
825 | static inline bool queue_is_rq_based(struct request_queue *q) | |
826 | { | |
827 | return q->request_fn || q->mq_ops; | |
828 | } | |
829 | ||
e692cb66 MP |
830 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
831 | { | |
832 | return q->limits.cluster; | |
833 | } | |
834 | ||
797476b8 DLM |
835 | static inline enum blk_zoned_model |
836 | blk_queue_zoned_model(struct request_queue *q) | |
837 | { | |
838 | return q->limits.zoned; | |
839 | } | |
840 | ||
841 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
842 | { | |
843 | switch (blk_queue_zoned_model(q)) { | |
844 | case BLK_ZONED_HA: | |
845 | case BLK_ZONED_HM: | |
846 | return true; | |
847 | default: | |
848 | return false; | |
849 | } | |
850 | } | |
851 | ||
f99e8648 | 852 | static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
853 | { |
854 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
855 | } | |
856 | ||
6cc77e9c CH |
857 | static inline unsigned int blk_queue_nr_zones(struct request_queue *q) |
858 | { | |
859 | return q->nr_zones; | |
860 | } | |
861 | ||
862 | static inline unsigned int blk_queue_zone_no(struct request_queue *q, | |
863 | sector_t sector) | |
864 | { | |
865 | if (!blk_queue_is_zoned(q)) | |
866 | return 0; | |
867 | return sector >> ilog2(q->limits.chunk_sectors); | |
868 | } | |
869 | ||
870 | static inline bool blk_queue_zone_is_seq(struct request_queue *q, | |
871 | sector_t sector) | |
872 | { | |
873 | if (!blk_queue_is_zoned(q) || !q->seq_zones_bitmap) | |
874 | return false; | |
875 | return test_bit(blk_queue_zone_no(q, sector), q->seq_zones_bitmap); | |
876 | } | |
877 | ||
1faa16d2 JA |
878 | static inline bool rq_is_sync(struct request *rq) |
879 | { | |
ef295ecf | 880 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
881 | } |
882 | ||
5b788ce3 | 883 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 884 | { |
5b788ce3 TH |
885 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
886 | ||
887 | return rl->flags & flag; | |
1da177e4 LT |
888 | } |
889 | ||
5b788ce3 | 890 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 891 | { |
5b788ce3 TH |
892 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
893 | ||
894 | rl->flags |= flag; | |
1da177e4 LT |
895 | } |
896 | ||
5b788ce3 | 897 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 898 | { |
5b788ce3 TH |
899 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
900 | ||
901 | rl->flags &= ~flag; | |
1da177e4 LT |
902 | } |
903 | ||
e2a60da7 MP |
904 | static inline bool rq_mergeable(struct request *rq) |
905 | { | |
57292b58 | 906 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 907 | return false; |
1da177e4 | 908 | |
3a5e02ce MC |
909 | if (req_op(rq) == REQ_OP_FLUSH) |
910 | return false; | |
911 | ||
a6f0788e CK |
912 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
913 | return false; | |
914 | ||
e2a60da7 | 915 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
916 | return false; |
917 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
918 | return false; |
919 | ||
920 | return true; | |
921 | } | |
1da177e4 | 922 | |
4363ac7c MP |
923 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
924 | { | |
efbeccdb CH |
925 | if (bio_page(a) == bio_page(b) && |
926 | bio_offset(a) == bio_offset(b)) | |
4363ac7c MP |
927 | return true; |
928 | ||
929 | return false; | |
930 | } | |
931 | ||
d278d4a8 JA |
932 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
933 | { | |
934 | if (q->queue_depth) | |
935 | return q->queue_depth; | |
936 | ||
937 | return q->nr_requests; | |
938 | } | |
939 | ||
1da177e4 LT |
940 | /* |
941 | * q->prep_rq_fn return values | |
942 | */ | |
0fb5b1fb MP |
943 | enum { |
944 | BLKPREP_OK, /* serve it */ | |
945 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
946 | BLKPREP_DEFER, /* leave on queue */ | |
947 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
948 | }; | |
1da177e4 LT |
949 | |
950 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
951 | ||
952 | /* | |
953 | * standard bounce addresses: | |
954 | * | |
955 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
956 | * BLK_BOUNCE_ANY : don't bounce anything | |
957 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
958 | */ | |
2472892a AK |
959 | |
960 | #if BITS_PER_LONG == 32 | |
1da177e4 | 961 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
962 | #else |
963 | #define BLK_BOUNCE_HIGH -1ULL | |
964 | #endif | |
965 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 966 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 967 | |
3d6392cf JA |
968 | /* |
969 | * default timeout for SG_IO if none specified | |
970 | */ | |
971 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 972 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 973 | |
152e283f FT |
974 | struct rq_map_data { |
975 | struct page **pages; | |
976 | int page_order; | |
977 | int nr_entries; | |
56c451f4 | 978 | unsigned long offset; |
97ae77a1 | 979 | int null_mapped; |
ecb554a8 | 980 | int from_user; |
152e283f FT |
981 | }; |
982 | ||
5705f702 | 983 | struct req_iterator { |
7988613b | 984 | struct bvec_iter iter; |
5705f702 N |
985 | struct bio *bio; |
986 | }; | |
987 | ||
988 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
989 | #define for_each_bio(_bio) \ |
990 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 991 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
992 | if ((rq->bio)) \ |
993 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
994 | ||
5705f702 N |
995 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
996 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 997 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 998 | |
4550dd6c | 999 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 1000 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 1001 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 1002 | |
2d4dc890 IL |
1003 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
1004 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
1005 | #endif | |
1006 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
1007 | extern void rq_flush_dcache_pages(struct request *rq); | |
1008 | #else | |
1009 | static inline void rq_flush_dcache_pages(struct request *rq) | |
1010 | { | |
1011 | } | |
1012 | #endif | |
1013 | ||
1da177e4 LT |
1014 | extern int blk_register_queue(struct gendisk *disk); |
1015 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 1016 | extern blk_qc_t generic_make_request(struct bio *bio); |
f421e1d9 | 1017 | extern blk_qc_t direct_make_request(struct bio *bio); |
2a4aa30c | 1018 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
da8d7f07 | 1019 | extern void blk_init_request_from_bio(struct request *req, struct bio *bio); |
1da177e4 | 1020 | extern void blk_put_request(struct request *); |
165125e1 | 1021 | extern void __blk_put_request(struct request_queue *, struct request *); |
6a15674d BVA |
1022 | extern struct request *blk_get_request_flags(struct request_queue *, |
1023 | unsigned int op, | |
9a95e4ef | 1024 | blk_mq_req_flags_t flags); |
cd6ce148 BVA |
1025 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
1026 | gfp_t gfp_mask); | |
165125e1 | 1027 | extern void blk_requeue_request(struct request_queue *, struct request *); |
ef9e3fac | 1028 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
1029 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
1030 | struct bio_set *bs, gfp_t gfp_mask, | |
1031 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
1032 | void *data); | |
1033 | extern void blk_rq_unprep_clone(struct request *rq); | |
2a842aca | 1034 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
82124d60 | 1035 | struct request *rq); |
0abc2a10 | 1036 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
3cca6dc1 | 1037 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
af67c31f | 1038 | extern void blk_queue_split(struct request_queue *, struct bio **); |
165125e1 | 1039 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 1040 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
1041 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
1042 | unsigned int, void __user *); | |
74f3c8af AV |
1043 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
1044 | unsigned int, void __user *); | |
e915e872 AV |
1045 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
1046 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 1047 | |
9a95e4ef | 1048 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
2e6edc95 | 1049 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 1050 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 1051 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 1052 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 1053 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 1054 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 1055 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 1056 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 1057 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 1058 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 1059 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
1060 | struct rq_map_data *, void __user *, unsigned long, |
1061 | gfp_t); | |
8e5cfc45 | 1062 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
1063 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
1064 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
1065 | struct rq_map_data *, const struct iov_iter *, |
1066 | gfp_t); | |
b7819b92 | 1067 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 1068 | struct request *, int); |
165125e1 | 1069 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 1070 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 1071 | |
2a842aca CH |
1072 | int blk_status_to_errno(blk_status_t status); |
1073 | blk_status_t errno_to_blk_status(int errno); | |
1074 | ||
ea435e1b | 1075 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
05229bee | 1076 | |
165125e1 | 1077 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 1078 | { |
ff9ea323 | 1079 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
1080 | } |
1081 | ||
5efccd17 | 1082 | /* |
80a761fd TH |
1083 | * blk_rq_pos() : the current sector |
1084 | * blk_rq_bytes() : bytes left in the entire request | |
1085 | * blk_rq_cur_bytes() : bytes left in the current segment | |
1086 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
1087 | * blk_rq_sectors() : sectors left in the entire request | |
1088 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 1089 | */ |
5b93629b TH |
1090 | static inline sector_t blk_rq_pos(const struct request *rq) |
1091 | { | |
a2dec7b3 | 1092 | return rq->__sector; |
2e46e8b2 TH |
1093 | } |
1094 | ||
1095 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
1096 | { | |
a2dec7b3 | 1097 | return rq->__data_len; |
5b93629b TH |
1098 | } |
1099 | ||
2e46e8b2 TH |
1100 | static inline int blk_rq_cur_bytes(const struct request *rq) |
1101 | { | |
1102 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
1103 | } | |
5efccd17 | 1104 | |
80a761fd TH |
1105 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
1106 | ||
5b93629b TH |
1107 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1108 | { | |
2e46e8b2 | 1109 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
1110 | } |
1111 | ||
1112 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
1113 | { | |
2e46e8b2 | 1114 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
1115 | } |
1116 | ||
6cc77e9c CH |
1117 | static inline unsigned int blk_rq_zone_no(struct request *rq) |
1118 | { | |
1119 | return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); | |
1120 | } | |
1121 | ||
1122 | static inline unsigned int blk_rq_zone_is_seq(struct request *rq) | |
1123 | { | |
1124 | return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); | |
1125 | } | |
1126 | ||
2e3258ec CH |
1127 | /* |
1128 | * Some commands like WRITE SAME have a payload or data transfer size which | |
1129 | * is different from the size of the request. Any driver that supports such | |
1130 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
1131 | * calculate the data transfer size. | |
1132 | */ | |
1133 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
1134 | { | |
1135 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1136 | return rq->special_vec.bv_len; | |
1137 | return blk_rq_bytes(rq); | |
1138 | } | |
1139 | ||
f31dc1cd | 1140 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 1141 | int op) |
f31dc1cd | 1142 | { |
7afafc8a | 1143 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
871dd928 | 1144 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 1145 | |
8fe0d473 | 1146 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1147 | return q->limits.max_write_same_sectors; |
1148 | ||
a6f0788e CK |
1149 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1150 | return q->limits.max_write_zeroes_sectors; | |
1151 | ||
f31dc1cd MP |
1152 | return q->limits.max_sectors; |
1153 | } | |
1154 | ||
762380ad JA |
1155 | /* |
1156 | * Return maximum size of a request at given offset. Only valid for | |
1157 | * file system requests. | |
1158 | */ | |
1159 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1160 | sector_t offset) | |
1161 | { | |
1162 | if (!q->limits.chunk_sectors) | |
736ed4de | 1163 | return q->limits.max_sectors; |
762380ad JA |
1164 | |
1165 | return q->limits.chunk_sectors - | |
1166 | (offset & (q->limits.chunk_sectors - 1)); | |
1167 | } | |
1168 | ||
17007f39 DLM |
1169 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1170 | sector_t offset) | |
f31dc1cd MP |
1171 | { |
1172 | struct request_queue *q = rq->q; | |
1173 | ||
57292b58 | 1174 | if (blk_rq_is_passthrough(rq)) |
f31dc1cd MP |
1175 | return q->limits.max_hw_sectors; |
1176 | ||
7afafc8a AH |
1177 | if (!q->limits.chunk_sectors || |
1178 | req_op(rq) == REQ_OP_DISCARD || | |
1179 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1180 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1181 | |
17007f39 | 1182 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1183 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1184 | } |
1185 | ||
75afb352 JN |
1186 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1187 | { | |
1188 | unsigned int nr_bios = 0; | |
1189 | struct bio *bio; | |
1190 | ||
1191 | __rq_for_each_bio(bio, rq) | |
1192 | nr_bios++; | |
1193 | ||
1194 | return nr_bios; | |
1195 | } | |
1196 | ||
9934c8c0 TH |
1197 | /* |
1198 | * Request issue related functions. | |
1199 | */ | |
1200 | extern struct request *blk_peek_request(struct request_queue *q); | |
1201 | extern void blk_start_request(struct request *rq); | |
1202 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1203 | ||
ef71de8b CH |
1204 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1205 | ||
1da177e4 | 1206 | /* |
2e60e022 TH |
1207 | * Request completion related functions. |
1208 | * | |
1209 | * blk_update_request() completes given number of bytes and updates | |
1210 | * the request without completing it. | |
1211 | * | |
f06d9a2b TH |
1212 | * blk_end_request() and friends. __blk_end_request() must be called |
1213 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1214 | * |
1215 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1216 | * blk_end_request() for parts of the original function. |
1217 | * This prevents code duplication in drivers. | |
1da177e4 | 1218 | */ |
2a842aca | 1219 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
2e60e022 | 1220 | unsigned int nr_bytes); |
2a842aca CH |
1221 | extern void blk_finish_request(struct request *rq, blk_status_t error); |
1222 | extern bool blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1223 | unsigned int nr_bytes); |
2a842aca CH |
1224 | extern void blk_end_request_all(struct request *rq, blk_status_t error); |
1225 | extern bool __blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1226 | unsigned int nr_bytes); |
2a842aca CH |
1227 | extern void __blk_end_request_all(struct request *rq, blk_status_t error); |
1228 | extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); | |
2e60e022 | 1229 | |
ff856bad | 1230 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1231 | extern void __blk_complete_request(struct request *); |
1232 | extern void blk_abort_request(struct request *); | |
28018c24 | 1233 | extern void blk_unprep_request(struct request *); |
ff856bad | 1234 | |
1da177e4 LT |
1235 | /* |
1236 | * Access functions for manipulating queue properties | |
1237 | */ | |
165125e1 | 1238 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1239 | spinlock_t *lock, int node_id); |
165125e1 | 1240 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
5ea708d1 | 1241 | extern int blk_init_allocated_queue(struct request_queue *); |
165125e1 JA |
1242 | extern void blk_cleanup_queue(struct request_queue *); |
1243 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1244 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1245 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1246 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1247 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1e739730 CH |
1248 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1249 | unsigned short); | |
165125e1 | 1250 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1251 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1252 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1253 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1254 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1255 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1256 | unsigned int max_write_same_sectors); | |
e1defc4f | 1257 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1258 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1259 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1260 | unsigned int alignment); | |
7c958e32 | 1261 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1262 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1263 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1264 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1265 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1266 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1267 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1268 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1269 | sector_t offset); | |
17be8c24 MP |
1270 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1271 | sector_t offset); | |
c72758f3 MP |
1272 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1273 | sector_t offset); | |
165125e1 | 1274 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1275 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1276 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1277 | extern int blk_queue_dma_drain(struct request_queue *q, |
1278 | dma_drain_needed_fn *dma_drain_needed, | |
1279 | void *buf, unsigned int size); | |
ef9e3fac | 1280 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1281 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1282 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1283 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1284 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1285 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1286 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1287 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1288 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1289 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1290 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1291 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1292 | |
1e739730 CH |
1293 | /* |
1294 | * Number of physical segments as sent to the device. | |
1295 | * | |
1296 | * Normally this is the number of discontiguous data segments sent by the | |
1297 | * submitter. But for data-less command like discard we might have no | |
1298 | * actual data segments submitted, but the driver might have to add it's | |
1299 | * own special payload. In that case we still return 1 here so that this | |
1300 | * special payload will be mapped. | |
1301 | */ | |
f9d03f96 CH |
1302 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1303 | { | |
1304 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1305 | return 1; | |
1306 | return rq->nr_phys_segments; | |
1307 | } | |
1308 | ||
1e739730 CH |
1309 | /* |
1310 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1311 | * Each discard bio merged into a request is counted as one segment. | |
1312 | */ | |
1313 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1314 | { | |
1315 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1316 | } | |
1317 | ||
165125e1 | 1318 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1319 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1320 | extern long nr_blockdev_pages(void); |
1da177e4 | 1321 | |
09ac46c4 | 1322 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1323 | struct request_queue *blk_alloc_queue(gfp_t); |
1324 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1325 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1326 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1327 | |
6c954667 LM |
1328 | /* |
1329 | * block layer runtime pm functions | |
1330 | */ | |
47fafbc7 | 1331 | #ifdef CONFIG_PM |
6c954667 LM |
1332 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1333 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1334 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1335 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1336 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
d07ab6d1 | 1337 | extern void blk_set_runtime_active(struct request_queue *q); |
6c954667 LM |
1338 | #else |
1339 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1340 | struct device *dev) {} | |
1341 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1342 | { | |
1343 | return -ENOSYS; | |
1344 | } | |
1345 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1346 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1347 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
9a05e754 | 1348 | static inline void blk_set_runtime_active(struct request_queue *q) {} |
6c954667 LM |
1349 | #endif |
1350 | ||
316cc67d | 1351 | /* |
75df7136 SJ |
1352 | * blk_plug permits building a queue of related requests by holding the I/O |
1353 | * fragments for a short period. This allows merging of sequential requests | |
1354 | * into single larger request. As the requests are moved from a per-task list to | |
1355 | * the device's request_queue in a batch, this results in improved scalability | |
1356 | * as the lock contention for request_queue lock is reduced. | |
1357 | * | |
1358 | * It is ok not to disable preemption when adding the request to the plug list | |
1359 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1360 | * the plug list when the task sleeps by itself. For details, please see | |
1361 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1362 | */ |
73c10101 | 1363 | struct blk_plug { |
75df7136 | 1364 | struct list_head list; /* requests */ |
320ae51f | 1365 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1366 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1367 | }; |
55c022bb | 1368 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1369 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1370 | |
9cbb1750 | 1371 | struct blk_plug_cb; |
74018dc3 | 1372 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1373 | struct blk_plug_cb { |
1374 | struct list_head list; | |
9cbb1750 N |
1375 | blk_plug_cb_fn callback; |
1376 | void *data; | |
048c9374 | 1377 | }; |
9cbb1750 N |
1378 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1379 | void *data, int size); | |
73c10101 JA |
1380 | extern void blk_start_plug(struct blk_plug *); |
1381 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1382 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1383 | |
1384 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1385 | { | |
1386 | struct blk_plug *plug = tsk->plug; | |
1387 | ||
a237c1c5 JA |
1388 | if (plug) |
1389 | blk_flush_plug_list(plug, false); | |
1390 | } | |
1391 | ||
1392 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1393 | { | |
1394 | struct blk_plug *plug = tsk->plug; | |
1395 | ||
88b996cd | 1396 | if (plug) |
f6603783 | 1397 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1398 | } |
1399 | ||
1400 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1401 | { | |
1402 | struct blk_plug *plug = tsk->plug; | |
1403 | ||
320ae51f JA |
1404 | return plug && |
1405 | (!list_empty(&plug->list) || | |
1406 | !list_empty(&plug->mq_list) || | |
1407 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1408 | } |
1409 | ||
1da177e4 LT |
1410 | /* |
1411 | * tag stuff | |
1412 | */ | |
165125e1 JA |
1413 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1414 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1415 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1416 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1417 | extern void blk_queue_free_tags(struct request_queue *); |
1418 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1419 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1420 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1421 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1422 | |
f583f492 DS |
1423 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1424 | int tag) | |
1425 | { | |
1426 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1427 | return NULL; | |
1428 | return bqt->tag_index[tag]; | |
1429 | } | |
dd3932ed | 1430 | |
ee472d83 CH |
1431 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1432 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
1433 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e950fdf7 CH |
1434 | |
1435 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
dd3932ed | 1436 | |
fbd9b09a DM |
1437 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1438 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1439 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1440 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1441 | struct bio **biop); |
ee472d83 CH |
1442 | |
1443 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ | |
cb365b96 | 1444 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
ee472d83 | 1445 | |
e73c23ff CK |
1446 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1447 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 1448 | unsigned flags); |
3f14d792 | 1449 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 CH |
1450 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1451 | ||
2cf6d26a CH |
1452 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1453 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1454 | { |
2cf6d26a CH |
1455 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1456 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1457 | gfp_mask, flags); | |
fb2dce86 | 1458 | } |
e6fa0be6 | 1459 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1460 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1461 | { |
1462 | return blkdev_issue_zeroout(sb->s_bdev, | |
1463 | block << (sb->s_blocksize_bits - 9), | |
1464 | nr_blocks << (sb->s_blocksize_bits - 9), | |
ee472d83 | 1465 | gfp_mask, 0); |
e6fa0be6 | 1466 | } |
1da177e4 | 1467 | |
f00c4d80 | 1468 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
0b07de85 | 1469 | |
eb28d31b MP |
1470 | enum blk_default_limits { |
1471 | BLK_MAX_SEGMENTS = 128, | |
1472 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1473 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1474 | BLK_MAX_SEGMENT_SIZE = 65536, |
1475 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1476 | }; | |
0e435ac2 | 1477 | |
1da177e4 LT |
1478 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1479 | ||
ae03bf63 MP |
1480 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
1481 | { | |
025146e1 | 1482 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1483 | } |
1484 | ||
03100aad KB |
1485 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1486 | { | |
1487 | return q->limits.virt_boundary_mask; | |
1488 | } | |
1489 | ||
ae03bf63 MP |
1490 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1491 | { | |
025146e1 | 1492 | return q->limits.max_sectors; |
ae03bf63 MP |
1493 | } |
1494 | ||
1495 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1496 | { | |
025146e1 | 1497 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1498 | } |
1499 | ||
8a78362c | 1500 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1501 | { |
8a78362c | 1502 | return q->limits.max_segments; |
ae03bf63 MP |
1503 | } |
1504 | ||
1e739730 CH |
1505 | static inline unsigned short queue_max_discard_segments(struct request_queue *q) |
1506 | { | |
1507 | return q->limits.max_discard_segments; | |
1508 | } | |
1509 | ||
ae03bf63 MP |
1510 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
1511 | { | |
025146e1 | 1512 | return q->limits.max_segment_size; |
ae03bf63 MP |
1513 | } |
1514 | ||
e1defc4f | 1515 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1516 | { |
1517 | int retval = 512; | |
1518 | ||
025146e1 MP |
1519 | if (q && q->limits.logical_block_size) |
1520 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1521 | |
1522 | return retval; | |
1523 | } | |
1524 | ||
e1defc4f | 1525 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1526 | { |
e1defc4f | 1527 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1528 | } |
1529 | ||
c72758f3 MP |
1530 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1531 | { | |
1532 | return q->limits.physical_block_size; | |
1533 | } | |
1534 | ||
892b6f90 | 1535 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1536 | { |
1537 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1538 | } | |
1539 | ||
c72758f3 MP |
1540 | static inline unsigned int queue_io_min(struct request_queue *q) |
1541 | { | |
1542 | return q->limits.io_min; | |
1543 | } | |
1544 | ||
ac481c20 MP |
1545 | static inline int bdev_io_min(struct block_device *bdev) |
1546 | { | |
1547 | return queue_io_min(bdev_get_queue(bdev)); | |
1548 | } | |
1549 | ||
c72758f3 MP |
1550 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1551 | { | |
1552 | return q->limits.io_opt; | |
1553 | } | |
1554 | ||
ac481c20 MP |
1555 | static inline int bdev_io_opt(struct block_device *bdev) |
1556 | { | |
1557 | return queue_io_opt(bdev_get_queue(bdev)); | |
1558 | } | |
1559 | ||
c72758f3 MP |
1560 | static inline int queue_alignment_offset(struct request_queue *q) |
1561 | { | |
ac481c20 | 1562 | if (q->limits.misaligned) |
c72758f3 MP |
1563 | return -1; |
1564 | ||
ac481c20 | 1565 | return q->limits.alignment_offset; |
c72758f3 MP |
1566 | } |
1567 | ||
e03a72e1 | 1568 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1569 | { |
1570 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1571 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1572 | |
b8839b8c | 1573 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1574 | } |
1575 | ||
ac481c20 MP |
1576 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1577 | { | |
1578 | struct request_queue *q = bdev_get_queue(bdev); | |
1579 | ||
1580 | if (q->limits.misaligned) | |
1581 | return -1; | |
1582 | ||
1583 | if (bdev != bdev->bd_contains) | |
1584 | return bdev->bd_part->alignment_offset; | |
1585 | ||
1586 | return q->limits.alignment_offset; | |
1587 | } | |
1588 | ||
86b37281 MP |
1589 | static inline int queue_discard_alignment(struct request_queue *q) |
1590 | { | |
1591 | if (q->limits.discard_misaligned) | |
1592 | return -1; | |
1593 | ||
1594 | return q->limits.discard_alignment; | |
1595 | } | |
1596 | ||
e03a72e1 | 1597 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1598 | { |
59771079 | 1599 | unsigned int alignment, granularity, offset; |
dd3d145d | 1600 | |
a934a00a MP |
1601 | if (!lim->max_discard_sectors) |
1602 | return 0; | |
1603 | ||
59771079 LT |
1604 | /* Why are these in bytes, not sectors? */ |
1605 | alignment = lim->discard_alignment >> 9; | |
1606 | granularity = lim->discard_granularity >> 9; | |
1607 | if (!granularity) | |
1608 | return 0; | |
1609 | ||
1610 | /* Offset of the partition start in 'granularity' sectors */ | |
1611 | offset = sector_div(sector, granularity); | |
1612 | ||
1613 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1614 | offset = (granularity + alignment - offset) % granularity; | |
1615 | ||
1616 | /* Turn it back into bytes, gaah */ | |
1617 | return offset << 9; | |
86b37281 MP |
1618 | } |
1619 | ||
c6e66634 PB |
1620 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1621 | { | |
1622 | struct request_queue *q = bdev_get_queue(bdev); | |
1623 | ||
1624 | if (bdev != bdev->bd_contains) | |
1625 | return bdev->bd_part->discard_alignment; | |
1626 | ||
1627 | return q->limits.discard_alignment; | |
1628 | } | |
1629 | ||
4363ac7c MP |
1630 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1631 | { | |
1632 | struct request_queue *q = bdev_get_queue(bdev); | |
1633 | ||
1634 | if (q) | |
1635 | return q->limits.max_write_same_sectors; | |
1636 | ||
1637 | return 0; | |
1638 | } | |
1639 | ||
a6f0788e CK |
1640 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1641 | { | |
1642 | struct request_queue *q = bdev_get_queue(bdev); | |
1643 | ||
1644 | if (q) | |
1645 | return q->limits.max_write_zeroes_sectors; | |
1646 | ||
1647 | return 0; | |
1648 | } | |
1649 | ||
797476b8 DLM |
1650 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1651 | { | |
1652 | struct request_queue *q = bdev_get_queue(bdev); | |
1653 | ||
1654 | if (q) | |
1655 | return blk_queue_zoned_model(q); | |
1656 | ||
1657 | return BLK_ZONED_NONE; | |
1658 | } | |
1659 | ||
1660 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1661 | { | |
1662 | struct request_queue *q = bdev_get_queue(bdev); | |
1663 | ||
1664 | if (q) | |
1665 | return blk_queue_is_zoned(q); | |
1666 | ||
1667 | return false; | |
1668 | } | |
1669 | ||
f99e8648 | 1670 | static inline unsigned int bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1671 | { |
1672 | struct request_queue *q = bdev_get_queue(bdev); | |
1673 | ||
1674 | if (q) | |
f99e8648 | 1675 | return blk_queue_zone_sectors(q); |
6cc77e9c CH |
1676 | return 0; |
1677 | } | |
6a0cb1bc | 1678 | |
6cc77e9c CH |
1679 | static inline unsigned int bdev_nr_zones(struct block_device *bdev) |
1680 | { | |
1681 | struct request_queue *q = bdev_get_queue(bdev); | |
6a0cb1bc | 1682 | |
6cc77e9c CH |
1683 | if (q) |
1684 | return blk_queue_nr_zones(q); | |
6a0cb1bc HR |
1685 | return 0; |
1686 | } | |
1687 | ||
165125e1 | 1688 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1689 | { |
482eb689 | 1690 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1691 | } |
1692 | ||
14417799 | 1693 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1694 | unsigned int len) |
1695 | { | |
1696 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1697 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1698 | } |
1699 | ||
1da177e4 LT |
1700 | /* assumes size > 256 */ |
1701 | static inline unsigned int blksize_bits(unsigned int size) | |
1702 | { | |
1703 | unsigned int bits = 8; | |
1704 | do { | |
1705 | bits++; | |
1706 | size >>= 1; | |
1707 | } while (size > 256); | |
1708 | return bits; | |
1709 | } | |
1710 | ||
2befb9e3 | 1711 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1712 | { |
1713 | return bdev->bd_block_size; | |
1714 | } | |
1715 | ||
f3876930 | 1716 | static inline bool queue_flush_queueable(struct request_queue *q) |
1717 | { | |
c888a8f9 | 1718 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1719 | } |
1720 | ||
1da177e4 LT |
1721 | typedef struct {struct page *v;} Sector; |
1722 | ||
1723 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1724 | ||
1725 | static inline void put_dev_sector(Sector p) | |
1726 | { | |
09cbfeaf | 1727 | put_page(p.v); |
1da177e4 LT |
1728 | } |
1729 | ||
e0af2917 ML |
1730 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
1731 | struct bio_vec *bprv, unsigned int offset) | |
1732 | { | |
1733 | return offset || | |
1734 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); | |
1735 | } | |
1736 | ||
03100aad KB |
1737 | /* |
1738 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
1739 | * the SG list. Most drivers don't care about this, but some do. | |
1740 | */ | |
1741 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
1742 | struct bio_vec *bprv, unsigned int offset) | |
1743 | { | |
1744 | if (!queue_virt_boundary(q)) | |
1745 | return false; | |
e0af2917 | 1746 | return __bvec_gap_to_prev(q, bprv, offset); |
03100aad KB |
1747 | } |
1748 | ||
729204ef ML |
1749 | /* |
1750 | * Check if the two bvecs from two bios can be merged to one segment. | |
1751 | * If yes, no need to check gap between the two bios since the 1st bio | |
1752 | * and the 1st bvec in the 2nd bio can be handled in one segment. | |
1753 | */ | |
1754 | static inline bool bios_segs_mergeable(struct request_queue *q, | |
1755 | struct bio *prev, struct bio_vec *prev_last_bv, | |
1756 | struct bio_vec *next_first_bv) | |
1757 | { | |
1758 | if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv)) | |
1759 | return false; | |
1760 | if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv)) | |
1761 | return false; | |
1762 | if (prev->bi_seg_back_size + next_first_bv->bv_len > | |
1763 | queue_max_segment_size(q)) | |
1764 | return false; | |
1765 | return true; | |
1766 | } | |
1767 | ||
5a8d75a1 ML |
1768 | static inline bool bio_will_gap(struct request_queue *q, |
1769 | struct request *prev_rq, | |
1770 | struct bio *prev, | |
1771 | struct bio *next) | |
5e7c4274 | 1772 | { |
25e71a99 ML |
1773 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
1774 | struct bio_vec pb, nb; | |
1775 | ||
5a8d75a1 ML |
1776 | /* |
1777 | * don't merge if the 1st bio starts with non-zero | |
1778 | * offset, otherwise it is quite difficult to respect | |
1779 | * sg gap limit. We work hard to merge a huge number of small | |
1780 | * single bios in case of mkfs. | |
1781 | */ | |
1782 | if (prev_rq) | |
1783 | bio_get_first_bvec(prev_rq->bio, &pb); | |
1784 | else | |
1785 | bio_get_first_bvec(prev, &pb); | |
1786 | if (pb.bv_offset) | |
1787 | return true; | |
1788 | ||
1789 | /* | |
1790 | * We don't need to worry about the situation that the | |
1791 | * merged segment ends in unaligned virt boundary: | |
1792 | * | |
1793 | * - if 'pb' ends aligned, the merged segment ends aligned | |
1794 | * - if 'pb' ends unaligned, the next bio must include | |
1795 | * one single bvec of 'nb', otherwise the 'nb' can't | |
1796 | * merge with 'pb' | |
1797 | */ | |
25e71a99 ML |
1798 | bio_get_last_bvec(prev, &pb); |
1799 | bio_get_first_bvec(next, &nb); | |
5e7c4274 | 1800 | |
729204ef ML |
1801 | if (!bios_segs_mergeable(q, prev, &pb, &nb)) |
1802 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); | |
25e71a99 ML |
1803 | } |
1804 | ||
1805 | return false; | |
5e7c4274 JA |
1806 | } |
1807 | ||
1808 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) | |
1809 | { | |
5a8d75a1 | 1810 | return bio_will_gap(req->q, req, req->biotail, bio); |
5e7c4274 JA |
1811 | } |
1812 | ||
1813 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) | |
1814 | { | |
5a8d75a1 | 1815 | return bio_will_gap(req->q, NULL, bio, req->bio); |
5e7c4274 JA |
1816 | } |
1817 | ||
59c3d45e | 1818 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1819 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
818cd1cb | 1820 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1821 | |
9195291e | 1822 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1823 | /* |
1824 | * This should not be using sched_clock(). A real patch is in progress | |
1825 | * to fix this up, until that is in place we need to disable preemption | |
1826 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1827 | */ | |
9195291e DS |
1828 | static inline void set_start_time_ns(struct request *req) |
1829 | { | |
28f4197e | 1830 | preempt_disable(); |
9195291e | 1831 | req->start_time_ns = sched_clock(); |
28f4197e | 1832 | preempt_enable(); |
9195291e DS |
1833 | } |
1834 | ||
1835 | static inline void set_io_start_time_ns(struct request *req) | |
1836 | { | |
28f4197e | 1837 | preempt_disable(); |
9195291e | 1838 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1839 | preempt_enable(); |
9195291e | 1840 | } |
84c124da DS |
1841 | |
1842 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1843 | { | |
1844 | return req->start_time_ns; | |
1845 | } | |
1846 | ||
1847 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1848 | { | |
1849 | return req->io_start_time_ns; | |
1850 | } | |
9195291e DS |
1851 | #else |
1852 | static inline void set_start_time_ns(struct request *req) {} | |
1853 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1854 | static inline uint64_t rq_start_time_ns(struct request *req) |
1855 | { | |
1856 | return 0; | |
1857 | } | |
1858 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1859 | { | |
1860 | return 0; | |
1861 | } | |
9195291e DS |
1862 | #endif |
1863 | ||
1da177e4 LT |
1864 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1865 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1866 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1867 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1868 | ||
7ba1ba12 MP |
1869 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1870 | ||
8288f496 MP |
1871 | enum blk_integrity_flags { |
1872 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1873 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1874 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1875 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1876 | }; |
7ba1ba12 | 1877 | |
18593088 | 1878 | struct blk_integrity_iter { |
7ba1ba12 MP |
1879 | void *prot_buf; |
1880 | void *data_buf; | |
3be91c4a | 1881 | sector_t seed; |
7ba1ba12 | 1882 | unsigned int data_size; |
3be91c4a | 1883 | unsigned short interval; |
7ba1ba12 MP |
1884 | const char *disk_name; |
1885 | }; | |
1886 | ||
4e4cbee9 | 1887 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1888 | |
0f8087ec MP |
1889 | struct blk_integrity_profile { |
1890 | integrity_processing_fn *generate_fn; | |
1891 | integrity_processing_fn *verify_fn; | |
1892 | const char *name; | |
1893 | }; | |
7ba1ba12 | 1894 | |
25520d55 | 1895 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1896 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1897 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1898 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1899 | struct scatterlist *); | |
1900 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1901 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1902 | struct request *); | |
1903 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1904 | struct bio *); | |
7ba1ba12 | 1905 | |
25520d55 | 1906 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1907 | { |
ac6fc48c | 1908 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1909 | |
1910 | if (!bi->profile) | |
1911 | return NULL; | |
1912 | ||
1913 | return bi; | |
b04accc4 JA |
1914 | } |
1915 | ||
25520d55 MP |
1916 | static inline |
1917 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1918 | { |
25520d55 | 1919 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1920 | } |
1921 | ||
180b2f95 | 1922 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1923 | { |
180b2f95 | 1924 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1925 | } |
1926 | ||
13f05c8d MP |
1927 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1928 | unsigned int segs) | |
1929 | { | |
1930 | q->limits.max_integrity_segments = segs; | |
1931 | } | |
1932 | ||
1933 | static inline unsigned short | |
1934 | queue_max_integrity_segments(struct request_queue *q) | |
1935 | { | |
1936 | return q->limits.max_integrity_segments; | |
1937 | } | |
1938 | ||
7f39add3 SG |
1939 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1940 | struct bio *next) | |
1941 | { | |
1942 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
1943 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
1944 | ||
1945 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1946 | bip_next->bip_vec[0].bv_offset); | |
1947 | } | |
1948 | ||
1949 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1950 | struct bio *bio) | |
1951 | { | |
1952 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1953 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
1954 | ||
1955 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1956 | bip_next->bip_vec[0].bv_offset); | |
1957 | } | |
1958 | ||
7ba1ba12 MP |
1959 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1960 | ||
fd83240a SR |
1961 | struct bio; |
1962 | struct block_device; | |
1963 | struct gendisk; | |
1964 | struct blk_integrity; | |
1965 | ||
1966 | static inline int blk_integrity_rq(struct request *rq) | |
1967 | { | |
1968 | return 0; | |
1969 | } | |
1970 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1971 | struct bio *b) | |
1972 | { | |
1973 | return 0; | |
1974 | } | |
1975 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1976 | struct bio *b, | |
1977 | struct scatterlist *s) | |
1978 | { | |
1979 | return 0; | |
1980 | } | |
1981 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1982 | { | |
61a04e5b | 1983 | return NULL; |
fd83240a SR |
1984 | } |
1985 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1986 | { | |
1987 | return NULL; | |
1988 | } | |
1989 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1990 | { | |
1991 | return 0; | |
1992 | } | |
25520d55 | 1993 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1994 | struct blk_integrity *b) |
1995 | { | |
fd83240a SR |
1996 | } |
1997 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1998 | { | |
1999 | } | |
2000 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
2001 | unsigned int segs) | |
2002 | { | |
2003 | } | |
2004 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
2005 | { | |
2006 | return 0; | |
2007 | } | |
4eaf99be MP |
2008 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
2009 | struct request *r1, | |
2010 | struct request *r2) | |
fd83240a | 2011 | { |
cb1a5ab6 | 2012 | return true; |
fd83240a | 2013 | } |
4eaf99be MP |
2014 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
2015 | struct request *r, | |
2016 | struct bio *b) | |
fd83240a | 2017 | { |
cb1a5ab6 | 2018 | return true; |
fd83240a | 2019 | } |
25520d55 | 2020 | |
7f39add3 SG |
2021 | static inline bool integrity_req_gap_back_merge(struct request *req, |
2022 | struct bio *next) | |
2023 | { | |
2024 | return false; | |
2025 | } | |
2026 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
2027 | struct bio *bio) | |
2028 | { | |
2029 | return false; | |
2030 | } | |
7ba1ba12 MP |
2031 | |
2032 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
2033 | ||
08f85851 | 2034 | struct block_device_operations { |
d4430d62 | 2035 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 2036 | void (*release) (struct gendisk *, fmode_t); |
c11f0c0b | 2037 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
d4430d62 AV |
2038 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
2039 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
77ea887e TH |
2040 | unsigned int (*check_events) (struct gendisk *disk, |
2041 | unsigned int clearing); | |
2042 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 2043 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 2044 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
2045 | int (*revalidate_disk) (struct gendisk *); |
2046 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
2047 | /* this callback is with swap_lock and sometimes page table lock held */ |
2048 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 | 2049 | struct module *owner; |
bbd3e064 | 2050 | const struct pr_ops *pr_ops; |
08f85851 AV |
2051 | }; |
2052 | ||
633a08b8 AV |
2053 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
2054 | unsigned long); | |
47a191fd MW |
2055 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
2056 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
2057 | struct writeback_control *); | |
6cc77e9c CH |
2058 | |
2059 | #ifdef CONFIG_BLK_DEV_ZONED | |
2060 | bool blk_req_needs_zone_write_lock(struct request *rq); | |
2061 | void __blk_req_zone_write_lock(struct request *rq); | |
2062 | void __blk_req_zone_write_unlock(struct request *rq); | |
2063 | ||
2064 | static inline void blk_req_zone_write_lock(struct request *rq) | |
2065 | { | |
2066 | if (blk_req_needs_zone_write_lock(rq)) | |
2067 | __blk_req_zone_write_lock(rq); | |
2068 | } | |
2069 | ||
2070 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
2071 | { | |
2072 | if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) | |
2073 | __blk_req_zone_write_unlock(rq); | |
2074 | } | |
2075 | ||
2076 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
2077 | { | |
2078 | return rq->q->seq_zones_wlock && | |
2079 | test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); | |
2080 | } | |
2081 | ||
2082 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
2083 | { | |
2084 | if (!blk_req_needs_zone_write_lock(rq)) | |
2085 | return true; | |
2086 | return !blk_req_zone_is_write_locked(rq); | |
2087 | } | |
2088 | #else | |
2089 | static inline bool blk_req_needs_zone_write_lock(struct request *rq) | |
2090 | { | |
2091 | return false; | |
2092 | } | |
2093 | ||
2094 | static inline void blk_req_zone_write_lock(struct request *rq) | |
2095 | { | |
2096 | } | |
2097 | ||
2098 | static inline void blk_req_zone_write_unlock(struct request *rq) | |
2099 | { | |
2100 | } | |
2101 | static inline bool blk_req_zone_is_write_locked(struct request *rq) | |
2102 | { | |
2103 | return false; | |
2104 | } | |
2105 | ||
2106 | static inline bool blk_req_can_dispatch_to_zone(struct request *rq) | |
2107 | { | |
2108 | return true; | |
2109 | } | |
2110 | #endif /* CONFIG_BLK_DEV_ZONED */ | |
2111 | ||
9361401e | 2112 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
2113 | |
2114 | struct block_device; | |
2115 | ||
9361401e DH |
2116 | /* |
2117 | * stubs for when the block layer is configured out | |
2118 | */ | |
2119 | #define buffer_heads_over_limit 0 | |
2120 | ||
9361401e DH |
2121 | static inline long nr_blockdev_pages(void) |
2122 | { | |
2123 | return 0; | |
2124 | } | |
2125 | ||
1f940bdf JA |
2126 | struct blk_plug { |
2127 | }; | |
2128 | ||
2129 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
2130 | { |
2131 | } | |
2132 | ||
1f940bdf | 2133 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
2134 | { |
2135 | } | |
2136 | ||
1f940bdf | 2137 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
2138 | { |
2139 | } | |
2140 | ||
a237c1c5 JA |
2141 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
2142 | { | |
2143 | } | |
2144 | ||
2145 | ||
73c10101 JA |
2146 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
2147 | { | |
2148 | return false; | |
2149 | } | |
2150 | ||
ac13a829 FF |
2151 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
2152 | sector_t *error_sector) | |
2153 | { | |
2154 | return 0; | |
2155 | } | |
2156 | ||
9361401e DH |
2157 | #endif /* CONFIG_BLOCK */ |
2158 | ||
1da177e4 | 2159 | #endif |