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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef _LINUX_BLKDEV_H |
3 | #define _LINUX_BLKDEV_H | |
4 | ||
85fd0bc9 | 5 | #include <linux/sched.h> |
e6017571 | 6 | #include <linux/sched/clock.h> |
85fd0bc9 | 7 | |
f5ff8422 JA |
8 | #ifdef CONFIG_BLOCK |
9 | ||
1da177e4 LT |
10 | #include <linux/major.h> |
11 | #include <linux/genhd.h> | |
12 | #include <linux/list.h> | |
320ae51f | 13 | #include <linux/llist.h> |
1da177e4 LT |
14 | #include <linux/timer.h> |
15 | #include <linux/workqueue.h> | |
16 | #include <linux/pagemap.h> | |
66114cad | 17 | #include <linux/backing-dev-defs.h> |
1da177e4 LT |
18 | #include <linux/wait.h> |
19 | #include <linux/mempool.h> | |
34c0fd54 | 20 | #include <linux/pfn.h> |
1da177e4 | 21 | #include <linux/bio.h> |
1da177e4 | 22 | #include <linux/stringify.h> |
3e6053d7 | 23 | #include <linux/gfp.h> |
d351af01 | 24 | #include <linux/bsg.h> |
c7c22e4d | 25 | #include <linux/smp.h> |
548bc8e1 | 26 | #include <linux/rcupdate.h> |
add703fd | 27 | #include <linux/percpu-refcount.h> |
84be456f | 28 | #include <linux/scatterlist.h> |
6a0cb1bc | 29 | #include <linux/blkzoned.h> |
1da177e4 | 30 | |
de477254 | 31 | struct module; |
21b2f0c8 CH |
32 | struct scsi_ioctl_command; |
33 | ||
1da177e4 | 34 | struct request_queue; |
1da177e4 | 35 | struct elevator_queue; |
2056a782 | 36 | struct blk_trace; |
3d6392cf JA |
37 | struct request; |
38 | struct sg_io_hdr; | |
aa387cc8 | 39 | struct bsg_job; |
3c798398 | 40 | struct blkcg_gq; |
7c94e1c1 | 41 | struct blk_flush_queue; |
bbd3e064 | 42 | struct pr_ops; |
87760e5e | 43 | struct rq_wb; |
34dbad5d OS |
44 | struct blk_queue_stats; |
45 | struct blk_stat_callback; | |
1da177e4 LT |
46 | |
47 | #define BLKDEV_MIN_RQ 4 | |
48 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
49 | ||
0206319f SB |
50 | /* Must be consisitent with blk_mq_poll_stats_bkt() */ |
51 | #define BLK_MQ_POLL_STATS_BKTS 16 | |
52 | ||
8bd435b3 TH |
53 | /* |
54 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
55 | * Defined here to simplify include dependency. | |
56 | */ | |
e21b7a0b | 57 | #define BLKCG_MAX_POLS 3 |
8bd435b3 | 58 | |
2a842aca | 59 | typedef void (rq_end_io_fn)(struct request *, blk_status_t); |
1da177e4 | 60 | |
5b788ce3 TH |
61 | #define BLK_RL_SYNCFULL (1U << 0) |
62 | #define BLK_RL_ASYNCFULL (1U << 1) | |
63 | ||
1da177e4 | 64 | struct request_list { |
5b788ce3 | 65 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
66 | #ifdef CONFIG_BLK_CGROUP |
67 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
68 | #endif | |
1faa16d2 JA |
69 | /* |
70 | * count[], starved[], and wait[] are indexed by | |
71 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
72 | */ | |
8a5ecdd4 TH |
73 | int count[2]; |
74 | int starved[2]; | |
75 | mempool_t *rq_pool; | |
76 | wait_queue_head_t wait[2]; | |
5b788ce3 | 77 | unsigned int flags; |
1da177e4 LT |
78 | }; |
79 | ||
e8064021 CH |
80 | /* |
81 | * request flags */ | |
82 | typedef __u32 __bitwise req_flags_t; | |
83 | ||
84 | /* elevator knows about this request */ | |
85 | #define RQF_SORTED ((__force req_flags_t)(1 << 0)) | |
86 | /* drive already may have started this one */ | |
87 | #define RQF_STARTED ((__force req_flags_t)(1 << 1)) | |
88 | /* uses tagged queueing */ | |
89 | #define RQF_QUEUED ((__force req_flags_t)(1 << 2)) | |
90 | /* may not be passed by ioscheduler */ | |
91 | #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) | |
92 | /* request for flush sequence */ | |
93 | #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) | |
94 | /* merge of different types, fail separately */ | |
95 | #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) | |
96 | /* track inflight for MQ */ | |
97 | #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) | |
98 | /* don't call prep for this one */ | |
99 | #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) | |
100 | /* set for "ide_preempt" requests and also for requests for which the SCSI | |
101 | "quiesce" state must be ignored. */ | |
102 | #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) | |
103 | /* contains copies of user pages */ | |
104 | #define RQF_COPY_USER ((__force req_flags_t)(1 << 9)) | |
105 | /* vaguely specified driver internal error. Ignored by the block layer */ | |
106 | #define RQF_FAILED ((__force req_flags_t)(1 << 10)) | |
107 | /* don't warn about errors */ | |
108 | #define RQF_QUIET ((__force req_flags_t)(1 << 11)) | |
109 | /* elevator private data attached */ | |
110 | #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) | |
111 | /* account I/O stat */ | |
112 | #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) | |
113 | /* request came from our alloc pool */ | |
114 | #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) | |
115 | /* runtime pm request */ | |
116 | #define RQF_PM ((__force req_flags_t)(1 << 15)) | |
117 | /* on IO scheduler merge hash */ | |
118 | #define RQF_HASHED ((__force req_flags_t)(1 << 16)) | |
cf43e6be JA |
119 | /* IO stats tracking on */ |
120 | #define RQF_STATS ((__force req_flags_t)(1 << 17)) | |
f9d03f96 CH |
121 | /* Look at ->special_vec for the actual data payload instead of the |
122 | bio chain. */ | |
123 | #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) | |
e8064021 CH |
124 | |
125 | /* flags that prevent us from merging requests: */ | |
126 | #define RQF_NOMERGE_FLAGS \ | |
f9d03f96 | 127 | (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) |
e8064021 | 128 | |
1da177e4 | 129 | /* |
af76e555 CH |
130 | * Try to put the fields that are referenced together in the same cacheline. |
131 | * | |
132 | * If you modify this structure, make sure to update blk_rq_init() and | |
133 | * especially blk_mq_rq_ctx_init() to take care of the added fields. | |
1da177e4 LT |
134 | */ |
135 | struct request { | |
6897fc22 | 136 | struct list_head queuelist; |
320ae51f | 137 | union { |
4ccafe03 | 138 | struct __call_single_data csd; |
9828c2c6 | 139 | u64 fifo_time; |
320ae51f | 140 | }; |
ff856bad | 141 | |
165125e1 | 142 | struct request_queue *q; |
320ae51f | 143 | struct blk_mq_ctx *mq_ctx; |
e6a1c874 | 144 | |
ca93e453 | 145 | int cpu; |
ef295ecf | 146 | unsigned int cmd_flags; /* op and common flags */ |
e8064021 | 147 | req_flags_t rq_flags; |
d486f1f2 JA |
148 | |
149 | int internal_tag; | |
150 | ||
242f9dcb | 151 | unsigned long atomic_flags; |
1da177e4 | 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 | ||
360f92c2 JA |
161 | /* |
162 | * The hash is used inside the scheduler, and killed once the | |
163 | * request reaches the dispatch list. The ipi_list is only used | |
164 | * to queue the request for softirq completion, which is long | |
165 | * after the request has been unhashed (and even removed from | |
166 | * the dispatch list). | |
167 | */ | |
168 | union { | |
169 | struct hlist_node hash; /* merge hash */ | |
170 | struct list_head ipi_list; | |
171 | }; | |
172 | ||
e6a1c874 JA |
173 | /* |
174 | * The rb_node is only used inside the io scheduler, requests | |
175 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 176 | * completion_data share space with the rb_node. |
e6a1c874 JA |
177 | */ |
178 | union { | |
179 | struct rb_node rb_node; /* sort/lookup */ | |
f9d03f96 | 180 | struct bio_vec special_vec; |
c186794d | 181 | void *completion_data; |
e26738e0 | 182 | int error_count; /* for legacy drivers, don't use */ |
e6a1c874 | 183 | }; |
9817064b | 184 | |
ff7d145f | 185 | /* |
7f1dc8a2 | 186 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
187 | * more they have to dynamically allocate it. Flush requests are |
188 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 189 | * space with the elevator data. |
ff7d145f | 190 | */ |
c186794d | 191 | union { |
a612fddf TH |
192 | struct { |
193 | struct io_cq *icq; | |
194 | void *priv[2]; | |
195 | } elv; | |
196 | ||
c186794d MS |
197 | struct { |
198 | unsigned int seq; | |
199 | struct list_head list; | |
4853abaa | 200 | rq_end_io_fn *saved_end_io; |
c186794d MS |
201 | } flush; |
202 | }; | |
ff7d145f | 203 | |
8f34ee75 | 204 | struct gendisk *rq_disk; |
09e099d4 | 205 | struct hd_struct *part; |
1da177e4 | 206 | unsigned long start_time; |
cf43e6be | 207 | struct blk_issue_stat issue_stat; |
9195291e | 208 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 209 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
210 | unsigned long long start_time_ns; |
211 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
212 | #endif | |
1da177e4 LT |
213 | /* Number of scatter-gather DMA addr+len pairs after |
214 | * physical address coalescing is performed. | |
215 | */ | |
216 | unsigned short nr_phys_segments; | |
13f05c8d MP |
217 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
218 | unsigned short nr_integrity_segments; | |
219 | #endif | |
1da177e4 | 220 | |
8f34ee75 JA |
221 | unsigned short ioprio; |
222 | ||
1dd5198b | 223 | unsigned int timeout; |
1da177e4 | 224 | |
731ec497 | 225 | void *special; /* opaque pointer available for LLD use */ |
cdd60262 | 226 | |
7a85f889 | 227 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 228 | |
cb6934f8 JA |
229 | unsigned short write_hint; |
230 | ||
242f9dcb JA |
231 | unsigned long deadline; |
232 | struct list_head timeout_list; | |
1da177e4 | 233 | |
1da177e4 | 234 | /* |
c00895ab | 235 | * completion callback. |
1da177e4 LT |
236 | */ |
237 | rq_end_io_fn *end_io; | |
238 | void *end_io_data; | |
abae1fde FT |
239 | |
240 | /* for bidi */ | |
241 | struct request *next_rq; | |
1da177e4 LT |
242 | }; |
243 | ||
14cb0dc6 ML |
244 | static inline bool blk_op_is_scsi(unsigned int op) |
245 | { | |
246 | return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; | |
247 | } | |
248 | ||
249 | static inline bool blk_op_is_private(unsigned int op) | |
250 | { | |
251 | return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; | |
252 | } | |
253 | ||
aebf526b CH |
254 | static inline bool blk_rq_is_scsi(struct request *rq) |
255 | { | |
14cb0dc6 | 256 | return blk_op_is_scsi(req_op(rq)); |
aebf526b CH |
257 | } |
258 | ||
259 | static inline bool blk_rq_is_private(struct request *rq) | |
260 | { | |
14cb0dc6 | 261 | return blk_op_is_private(req_op(rq)); |
aebf526b CH |
262 | } |
263 | ||
57292b58 CH |
264 | static inline bool blk_rq_is_passthrough(struct request *rq) |
265 | { | |
aebf526b | 266 | return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); |
57292b58 CH |
267 | } |
268 | ||
14cb0dc6 ML |
269 | static inline bool bio_is_passthrough(struct bio *bio) |
270 | { | |
271 | unsigned op = bio_op(bio); | |
272 | ||
273 | return blk_op_is_scsi(op) || blk_op_is_private(op); | |
274 | } | |
275 | ||
766ca442 FLVC |
276 | static inline unsigned short req_get_ioprio(struct request *req) |
277 | { | |
278 | return req->ioprio; | |
279 | } | |
280 | ||
1da177e4 LT |
281 | #include <linux/elevator.h> |
282 | ||
320ae51f JA |
283 | struct blk_queue_ctx; |
284 | ||
165125e1 | 285 | typedef void (request_fn_proc) (struct request_queue *q); |
dece1635 | 286 | typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
ea435e1b | 287 | typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); |
165125e1 | 288 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 289 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
290 | |
291 | struct bio_vec; | |
ff856bad | 292 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 293 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 294 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 295 | typedef int (bsg_job_fn) (struct bsg_job *); |
6d247d7f CH |
296 | typedef int (init_rq_fn)(struct request_queue *, struct request *, gfp_t); |
297 | typedef void (exit_rq_fn)(struct request_queue *, struct request *); | |
1da177e4 | 298 | |
242f9dcb JA |
299 | enum blk_eh_timer_return { |
300 | BLK_EH_NOT_HANDLED, | |
301 | BLK_EH_HANDLED, | |
302 | BLK_EH_RESET_TIMER, | |
303 | }; | |
304 | ||
305 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
306 | ||
1da177e4 LT |
307 | enum blk_queue_state { |
308 | Queue_down, | |
309 | Queue_up, | |
310 | }; | |
311 | ||
1da177e4 LT |
312 | struct blk_queue_tag { |
313 | struct request **tag_index; /* map of busy tags */ | |
314 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 | 315 | int max_depth; /* what we will send to device */ |
ba025082 | 316 | int real_max_depth; /* what the array can hold */ |
1da177e4 | 317 | atomic_t refcnt; /* map can be shared */ |
ee1b6f7a SL |
318 | int alloc_policy; /* tag allocation policy */ |
319 | int next_tag; /* next tag */ | |
1da177e4 | 320 | }; |
ee1b6f7a SL |
321 | #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
322 | #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ | |
1da177e4 | 323 | |
abf54393 FT |
324 | #define BLK_SCSI_MAX_CMDS (256) |
325 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
326 | ||
797476b8 DLM |
327 | /* |
328 | * Zoned block device models (zoned limit). | |
329 | */ | |
330 | enum blk_zoned_model { | |
331 | BLK_ZONED_NONE, /* Regular block device */ | |
332 | BLK_ZONED_HA, /* Host-aware zoned block device */ | |
333 | BLK_ZONED_HM, /* Host-managed zoned block device */ | |
334 | }; | |
335 | ||
025146e1 MP |
336 | struct queue_limits { |
337 | unsigned long bounce_pfn; | |
338 | unsigned long seg_boundary_mask; | |
03100aad | 339 | unsigned long virt_boundary_mask; |
025146e1 MP |
340 | |
341 | unsigned int max_hw_sectors; | |
ca369d51 | 342 | unsigned int max_dev_sectors; |
762380ad | 343 | unsigned int chunk_sectors; |
025146e1 MP |
344 | unsigned int max_sectors; |
345 | unsigned int max_segment_size; | |
c72758f3 MP |
346 | unsigned int physical_block_size; |
347 | unsigned int alignment_offset; | |
348 | unsigned int io_min; | |
349 | unsigned int io_opt; | |
67efc925 | 350 | unsigned int max_discard_sectors; |
0034af03 | 351 | unsigned int max_hw_discard_sectors; |
4363ac7c | 352 | unsigned int max_write_same_sectors; |
a6f0788e | 353 | unsigned int max_write_zeroes_sectors; |
86b37281 MP |
354 | unsigned int discard_granularity; |
355 | unsigned int discard_alignment; | |
025146e1 MP |
356 | |
357 | unsigned short logical_block_size; | |
8a78362c | 358 | unsigned short max_segments; |
13f05c8d | 359 | unsigned short max_integrity_segments; |
1e739730 | 360 | unsigned short max_discard_segments; |
025146e1 | 361 | |
c72758f3 | 362 | unsigned char misaligned; |
86b37281 | 363 | unsigned char discard_misaligned; |
e692cb66 | 364 | unsigned char cluster; |
c78afc62 | 365 | unsigned char raid_partial_stripes_expensive; |
797476b8 | 366 | enum blk_zoned_model zoned; |
025146e1 MP |
367 | }; |
368 | ||
6a0cb1bc HR |
369 | #ifdef CONFIG_BLK_DEV_ZONED |
370 | ||
371 | struct blk_zone_report_hdr { | |
372 | unsigned int nr_zones; | |
373 | u8 padding[60]; | |
374 | }; | |
375 | ||
376 | extern int blkdev_report_zones(struct block_device *bdev, | |
377 | sector_t sector, struct blk_zone *zones, | |
378 | unsigned int *nr_zones, gfp_t gfp_mask); | |
379 | extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors, | |
380 | sector_t nr_sectors, gfp_t gfp_mask); | |
381 | ||
3ed05a98 ST |
382 | extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, |
383 | unsigned int cmd, unsigned long arg); | |
384 | extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode, | |
385 | unsigned int cmd, unsigned long arg); | |
386 | ||
387 | #else /* CONFIG_BLK_DEV_ZONED */ | |
388 | ||
389 | static inline int blkdev_report_zones_ioctl(struct block_device *bdev, | |
390 | fmode_t mode, unsigned int cmd, | |
391 | unsigned long arg) | |
392 | { | |
393 | return -ENOTTY; | |
394 | } | |
395 | ||
396 | static inline int blkdev_reset_zones_ioctl(struct block_device *bdev, | |
397 | fmode_t mode, unsigned int cmd, | |
398 | unsigned long arg) | |
399 | { | |
400 | return -ENOTTY; | |
401 | } | |
402 | ||
6a0cb1bc HR |
403 | #endif /* CONFIG_BLK_DEV_ZONED */ |
404 | ||
d7b76301 | 405 | struct request_queue { |
1da177e4 LT |
406 | /* |
407 | * Together with queue_head for cacheline sharing | |
408 | */ | |
409 | struct list_head queue_head; | |
410 | struct request *last_merge; | |
b374d18a | 411 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
412 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
413 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 | 414 | |
8e8320c9 JA |
415 | atomic_t shared_hctx_restart; |
416 | ||
34dbad5d | 417 | struct blk_queue_stats *stats; |
87760e5e JA |
418 | struct rq_wb *rq_wb; |
419 | ||
1da177e4 | 420 | /* |
a051661c TH |
421 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
422 | * is used, root blkg allocates from @q->root_rl and all other | |
423 | * blkgs from their own blkg->rl. Which one to use should be | |
424 | * determined using bio_request_list(). | |
1da177e4 | 425 | */ |
a051661c | 426 | struct request_list root_rl; |
1da177e4 LT |
427 | |
428 | request_fn_proc *request_fn; | |
1da177e4 | 429 | make_request_fn *make_request_fn; |
ea435e1b | 430 | poll_q_fn *poll_fn; |
1da177e4 | 431 | prep_rq_fn *prep_rq_fn; |
28018c24 | 432 | unprep_rq_fn *unprep_rq_fn; |
ff856bad | 433 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 434 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 435 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 436 | lld_busy_fn *lld_busy_fn; |
d280bab3 | 437 | /* Called just after a request is allocated */ |
6d247d7f | 438 | init_rq_fn *init_rq_fn; |
d280bab3 | 439 | /* Called just before a request is freed */ |
6d247d7f | 440 | exit_rq_fn *exit_rq_fn; |
d280bab3 BVA |
441 | /* Called from inside blk_get_request() */ |
442 | void (*initialize_rq_fn)(struct request *rq); | |
1da177e4 | 443 | |
f8a5b122 | 444 | const struct blk_mq_ops *mq_ops; |
320ae51f JA |
445 | |
446 | unsigned int *mq_map; | |
447 | ||
448 | /* sw queues */ | |
e6cdb092 | 449 | struct blk_mq_ctx __percpu *queue_ctx; |
320ae51f JA |
450 | unsigned int nr_queues; |
451 | ||
d278d4a8 JA |
452 | unsigned int queue_depth; |
453 | ||
320ae51f JA |
454 | /* hw dispatch queues */ |
455 | struct blk_mq_hw_ctx **queue_hw_ctx; | |
456 | unsigned int nr_hw_queues; | |
457 | ||
8922e16c TH |
458 | /* |
459 | * Dispatch queue sorting | |
460 | */ | |
1b47f531 | 461 | sector_t end_sector; |
8922e16c | 462 | struct request *boundary_rq; |
8922e16c | 463 | |
1da177e4 | 464 | /* |
3cca6dc1 | 465 | * Delayed queue handling |
1da177e4 | 466 | */ |
3cca6dc1 | 467 | struct delayed_work delay_work; |
1da177e4 | 468 | |
dc3b17cc | 469 | struct backing_dev_info *backing_dev_info; |
1da177e4 LT |
470 | |
471 | /* | |
472 | * The queue owner gets to use this for whatever they like. | |
473 | * ll_rw_blk doesn't touch it. | |
474 | */ | |
475 | void *queuedata; | |
476 | ||
1da177e4 | 477 | /* |
d7b76301 | 478 | * various queue flags, see QUEUE_* below |
1da177e4 | 479 | */ |
d7b76301 | 480 | unsigned long queue_flags; |
1da177e4 | 481 | |
a73f730d TH |
482 | /* |
483 | * ida allocated id for this queue. Used to index queues from | |
484 | * ioctx. | |
485 | */ | |
486 | int id; | |
487 | ||
1da177e4 | 488 | /* |
d7b76301 | 489 | * queue needs bounce pages for pages above this limit |
1da177e4 | 490 | */ |
d7b76301 | 491 | gfp_t bounce_gfp; |
1da177e4 LT |
492 | |
493 | /* | |
152587de JA |
494 | * protects queue structures from reentrancy. ->__queue_lock should |
495 | * _never_ be used directly, it is queue private. always use | |
496 | * ->queue_lock. | |
1da177e4 | 497 | */ |
152587de | 498 | spinlock_t __queue_lock; |
1da177e4 LT |
499 | spinlock_t *queue_lock; |
500 | ||
501 | /* | |
502 | * queue kobject | |
503 | */ | |
504 | struct kobject kobj; | |
505 | ||
320ae51f JA |
506 | /* |
507 | * mq queue kobject | |
508 | */ | |
509 | struct kobject mq_kobj; | |
510 | ||
ac6fc48c DW |
511 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
512 | struct blk_integrity integrity; | |
513 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
514 | ||
47fafbc7 | 515 | #ifdef CONFIG_PM |
6c954667 LM |
516 | struct device *dev; |
517 | int rpm_status; | |
518 | unsigned int nr_pending; | |
519 | #endif | |
520 | ||
1da177e4 LT |
521 | /* |
522 | * queue settings | |
523 | */ | |
524 | unsigned long nr_requests; /* Max # of requests */ | |
525 | unsigned int nr_congestion_on; | |
526 | unsigned int nr_congestion_off; | |
527 | unsigned int nr_batching; | |
528 | ||
fa0ccd83 | 529 | unsigned int dma_drain_size; |
d7b76301 | 530 | void *dma_drain_buffer; |
e3790c7d | 531 | unsigned int dma_pad_mask; |
1da177e4 LT |
532 | unsigned int dma_alignment; |
533 | ||
534 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 535 | struct list_head tag_busy_list; |
1da177e4 | 536 | |
15853af9 | 537 | unsigned int nr_sorted; |
0a7ae2ff | 538 | unsigned int in_flight[2]; |
cf43e6be | 539 | |
24faf6f6 BVA |
540 | /* |
541 | * Number of active block driver functions for which blk_drain_queue() | |
542 | * must wait. Must be incremented around functions that unlock the | |
543 | * queue_lock internally, e.g. scsi_request_fn(). | |
544 | */ | |
545 | unsigned int request_fn_active; | |
1da177e4 | 546 | |
242f9dcb | 547 | unsigned int rq_timeout; |
64f1c21e | 548 | int poll_nsec; |
34dbad5d OS |
549 | |
550 | struct blk_stat_callback *poll_cb; | |
0206319f | 551 | struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; |
34dbad5d | 552 | |
242f9dcb | 553 | struct timer_list timeout; |
287922eb | 554 | struct work_struct timeout_work; |
242f9dcb JA |
555 | struct list_head timeout_list; |
556 | ||
a612fddf | 557 | struct list_head icq_list; |
4eef3049 | 558 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 559 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 560 | struct blkcg_gq *root_blkg; |
03aa264a | 561 | struct list_head blkg_list; |
4eef3049 | 562 | #endif |
a612fddf | 563 | |
025146e1 MP |
564 | struct queue_limits limits; |
565 | ||
1da177e4 LT |
566 | /* |
567 | * sg stuff | |
568 | */ | |
569 | unsigned int sg_timeout; | |
570 | unsigned int sg_reserved_size; | |
1946089a | 571 | int node; |
6c5c9341 | 572 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 573 | struct blk_trace *blk_trace; |
5acb3cc2 | 574 | struct mutex blk_trace_mutex; |
6c5c9341 | 575 | #endif |
1da177e4 | 576 | /* |
4913efe4 | 577 | * for flush operations |
1da177e4 | 578 | */ |
7c94e1c1 | 579 | struct blk_flush_queue *fq; |
483f4afc | 580 | |
6fca6a61 CH |
581 | struct list_head requeue_list; |
582 | spinlock_t requeue_lock; | |
2849450a | 583 | struct delayed_work requeue_work; |
6fca6a61 | 584 | |
483f4afc | 585 | struct mutex sysfs_lock; |
d351af01 | 586 | |
d732580b | 587 | int bypass_depth; |
4ecd4fef | 588 | atomic_t mq_freeze_depth; |
d732580b | 589 | |
d351af01 | 590 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 | 591 | bsg_job_fn *bsg_job_fn; |
d351af01 FT |
592 | struct bsg_class_device bsg_dev; |
593 | #endif | |
e43473b7 VG |
594 | |
595 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
596 | /* Throttle data */ | |
597 | struct throtl_data *td; | |
598 | #endif | |
548bc8e1 | 599 | struct rcu_head rcu_head; |
320ae51f | 600 | wait_queue_head_t mq_freeze_wq; |
3ef28e83 | 601 | struct percpu_ref q_usage_counter; |
320ae51f | 602 | struct list_head all_q_node; |
0d2602ca JA |
603 | |
604 | struct blk_mq_tag_set *tag_set; | |
605 | struct list_head tag_set_list; | |
54efd50b | 606 | struct bio_set *bio_split; |
4593fdbe | 607 | |
03796c14 | 608 | #ifdef CONFIG_BLK_DEBUG_FS |
07e4fead | 609 | struct dentry *debugfs_dir; |
d332ce09 | 610 | struct dentry *sched_debugfs_dir; |
07e4fead OS |
611 | #endif |
612 | ||
4593fdbe | 613 | bool mq_sysfs_init_done; |
6d247d7f CH |
614 | |
615 | size_t cmd_size; | |
616 | void *rq_alloc_data; | |
dc9edc44 BVA |
617 | |
618 | struct work_struct release_work; | |
f793dfd3 JA |
619 | |
620 | #define BLK_MAX_WRITE_HINTS 5 | |
621 | u64 write_hints[BLK_MAX_WRITE_HINTS]; | |
1da177e4 LT |
622 | }; |
623 | ||
e743eb1e JA |
624 | #define QUEUE_FLAG_QUEUED 0 /* uses generic tag queueing */ |
625 | #define QUEUE_FLAG_STOPPED 1 /* queue is stopped */ | |
626 | #define QUEUE_FLAG_DYING 2 /* queue being torn down */ | |
627 | #define QUEUE_FLAG_BYPASS 3 /* act as dumb FIFO queue */ | |
628 | #define QUEUE_FLAG_BIDI 4 /* queue supports bidi requests */ | |
629 | #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */ | |
630 | #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */ | |
631 | #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */ | |
e743eb1e | 632 | #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */ |
88e740f1 | 633 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
e743eb1e JA |
634 | #define QUEUE_FLAG_IO_STAT 10 /* do IO stats */ |
635 | #define QUEUE_FLAG_DISCARD 11 /* supports DISCARD */ | |
636 | #define QUEUE_FLAG_NOXMERGES 12 /* No extended merges */ | |
637 | #define QUEUE_FLAG_ADD_RANDOM 13 /* Contributes to random pool */ | |
638 | #define QUEUE_FLAG_SECERASE 14 /* supports secure erase */ | |
639 | #define QUEUE_FLAG_SAME_FORCE 15 /* force complete on same CPU */ | |
640 | #define QUEUE_FLAG_DEAD 16 /* queue tear-down finished */ | |
641 | #define QUEUE_FLAG_INIT_DONE 17 /* queue is initialized */ | |
642 | #define QUEUE_FLAG_NO_SG_MERGE 18 /* don't attempt to merge SG segments*/ | |
643 | #define QUEUE_FLAG_POLL 19 /* IO polling enabled if set */ | |
644 | #define QUEUE_FLAG_WC 20 /* Write back caching */ | |
645 | #define QUEUE_FLAG_FUA 21 /* device supports FUA writes */ | |
646 | #define QUEUE_FLAG_FLUSH_NQ 22 /* flush not queueuable */ | |
647 | #define QUEUE_FLAG_DAX 23 /* device supports DAX */ | |
648 | #define QUEUE_FLAG_STATS 24 /* track rq completion times */ | |
649 | #define QUEUE_FLAG_POLL_STATS 25 /* collecting stats for hybrid polling */ | |
650 | #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ | |
651 | #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ | |
652 | #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ | |
c9254f2d | 653 | #define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ |
bc58ba94 JA |
654 | |
655 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
e2e1a148 JA |
656 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
657 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 658 | |
94eddfbe | 659 | #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
8e0b60b9 CH |
660 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
661 | (1 << QUEUE_FLAG_POLL)) | |
94eddfbe | 662 | |
9e0c8299 BVA |
663 | /* |
664 | * @q->queue_lock is set while a queue is being initialized. Since we know | |
665 | * that no other threads access the queue object before @q->queue_lock has | |
666 | * been set, it is safe to manipulate queue flags without holding the | |
667 | * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and | |
668 | * blk_init_allocated_queue(). | |
669 | */ | |
8bcb6c7d | 670 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 671 | { |
8bcb6c7d AK |
672 | if (q->queue_lock) |
673 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
674 | } |
675 | ||
75ad23bc NP |
676 | static inline void queue_flag_set_unlocked(unsigned int flag, |
677 | struct request_queue *q) | |
678 | { | |
679 | __set_bit(flag, &q->queue_flags); | |
680 | } | |
681 | ||
e48ec690 JA |
682 | static inline int queue_flag_test_and_clear(unsigned int flag, |
683 | struct request_queue *q) | |
684 | { | |
8bcb6c7d | 685 | queue_lockdep_assert_held(q); |
e48ec690 JA |
686 | |
687 | if (test_bit(flag, &q->queue_flags)) { | |
688 | __clear_bit(flag, &q->queue_flags); | |
689 | return 1; | |
690 | } | |
691 | ||
692 | return 0; | |
693 | } | |
694 | ||
695 | static inline int queue_flag_test_and_set(unsigned int flag, | |
696 | struct request_queue *q) | |
697 | { | |
8bcb6c7d | 698 | queue_lockdep_assert_held(q); |
e48ec690 JA |
699 | |
700 | if (!test_bit(flag, &q->queue_flags)) { | |
701 | __set_bit(flag, &q->queue_flags); | |
702 | return 0; | |
703 | } | |
704 | ||
705 | return 1; | |
706 | } | |
707 | ||
75ad23bc NP |
708 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
709 | { | |
8bcb6c7d | 710 | queue_lockdep_assert_held(q); |
75ad23bc NP |
711 | __set_bit(flag, &q->queue_flags); |
712 | } | |
713 | ||
714 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
715 | struct request_queue *q) | |
716 | { | |
717 | __clear_bit(flag, &q->queue_flags); | |
718 | } | |
719 | ||
0a7ae2ff JA |
720 | static inline int queue_in_flight(struct request_queue *q) |
721 | { | |
722 | return q->in_flight[0] + q->in_flight[1]; | |
723 | } | |
724 | ||
75ad23bc NP |
725 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
726 | { | |
8bcb6c7d | 727 | queue_lockdep_assert_held(q); |
75ad23bc NP |
728 | __clear_bit(flag, &q->queue_flags); |
729 | } | |
730 | ||
1da177e4 LT |
731 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
732 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 733 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 734 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 735 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
320ae51f | 736 | #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) |
ac9fafa1 | 737 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
738 | #define blk_queue_noxmerges(q) \ |
739 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 740 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 741 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 742 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
c15227de | 743 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
288dab8a CH |
744 | #define blk_queue_secure_erase(q) \ |
745 | (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) | |
163d4baa | 746 | #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) |
9efc160f BVA |
747 | #define blk_queue_scsi_passthrough(q) \ |
748 | test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) | |
1da177e4 | 749 | |
33659ebb CH |
750 | #define blk_noretry_request(rq) \ |
751 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
752 | REQ_FAILFAST_DRIVER)) | |
f4560ffe | 753 | #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) |
c9254f2d BVA |
754 | #define blk_queue_preempt_only(q) \ |
755 | test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) | |
756 | ||
757 | extern int blk_set_preempt_only(struct request_queue *q); | |
758 | extern void blk_clear_preempt_only(struct request_queue *q); | |
33659ebb | 759 | |
57292b58 CH |
760 | static inline bool blk_account_rq(struct request *rq) |
761 | { | |
762 | return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); | |
763 | } | |
33659ebb | 764 | |
ab780f1e | 765 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 766 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
767 | /* rq->queuelist of dequeued request must be list_empty() */ |
768 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
769 | |
770 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
771 | ||
4e1b2d52 | 772 | #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) |
1da177e4 | 773 | |
49fd524f JA |
774 | /* |
775 | * Driver can handle struct request, if it either has an old style | |
776 | * request_fn defined, or is blk-mq based. | |
777 | */ | |
778 | static inline bool queue_is_rq_based(struct request_queue *q) | |
779 | { | |
780 | return q->request_fn || q->mq_ops; | |
781 | } | |
782 | ||
e692cb66 MP |
783 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
784 | { | |
785 | return q->limits.cluster; | |
786 | } | |
787 | ||
797476b8 DLM |
788 | static inline enum blk_zoned_model |
789 | blk_queue_zoned_model(struct request_queue *q) | |
790 | { | |
791 | return q->limits.zoned; | |
792 | } | |
793 | ||
794 | static inline bool blk_queue_is_zoned(struct request_queue *q) | |
795 | { | |
796 | switch (blk_queue_zoned_model(q)) { | |
797 | case BLK_ZONED_HA: | |
798 | case BLK_ZONED_HM: | |
799 | return true; | |
800 | default: | |
801 | return false; | |
802 | } | |
803 | } | |
804 | ||
f99e8648 | 805 | static inline unsigned int blk_queue_zone_sectors(struct request_queue *q) |
6a0cb1bc HR |
806 | { |
807 | return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; | |
808 | } | |
809 | ||
1faa16d2 JA |
810 | static inline bool rq_is_sync(struct request *rq) |
811 | { | |
ef295ecf | 812 | return op_is_sync(rq->cmd_flags); |
1faa16d2 JA |
813 | } |
814 | ||
5b788ce3 | 815 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 816 | { |
5b788ce3 TH |
817 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
818 | ||
819 | return rl->flags & flag; | |
1da177e4 LT |
820 | } |
821 | ||
5b788ce3 | 822 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 823 | { |
5b788ce3 TH |
824 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
825 | ||
826 | rl->flags |= flag; | |
1da177e4 LT |
827 | } |
828 | ||
5b788ce3 | 829 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 830 | { |
5b788ce3 TH |
831 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
832 | ||
833 | rl->flags &= ~flag; | |
1da177e4 LT |
834 | } |
835 | ||
e2a60da7 MP |
836 | static inline bool rq_mergeable(struct request *rq) |
837 | { | |
57292b58 | 838 | if (blk_rq_is_passthrough(rq)) |
e2a60da7 | 839 | return false; |
1da177e4 | 840 | |
3a5e02ce MC |
841 | if (req_op(rq) == REQ_OP_FLUSH) |
842 | return false; | |
843 | ||
a6f0788e CK |
844 | if (req_op(rq) == REQ_OP_WRITE_ZEROES) |
845 | return false; | |
846 | ||
e2a60da7 | 847 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
e8064021 CH |
848 | return false; |
849 | if (rq->rq_flags & RQF_NOMERGE_FLAGS) | |
e2a60da7 MP |
850 | return false; |
851 | ||
852 | return true; | |
853 | } | |
1da177e4 | 854 | |
4363ac7c MP |
855 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
856 | { | |
efbeccdb CH |
857 | if (bio_page(a) == bio_page(b) && |
858 | bio_offset(a) == bio_offset(b)) | |
4363ac7c MP |
859 | return true; |
860 | ||
861 | return false; | |
862 | } | |
863 | ||
d278d4a8 JA |
864 | static inline unsigned int blk_queue_depth(struct request_queue *q) |
865 | { | |
866 | if (q->queue_depth) | |
867 | return q->queue_depth; | |
868 | ||
869 | return q->nr_requests; | |
870 | } | |
871 | ||
1da177e4 LT |
872 | /* |
873 | * q->prep_rq_fn return values | |
874 | */ | |
0fb5b1fb MP |
875 | enum { |
876 | BLKPREP_OK, /* serve it */ | |
877 | BLKPREP_KILL, /* fatal error, kill, return -EIO */ | |
878 | BLKPREP_DEFER, /* leave on queue */ | |
879 | BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */ | |
880 | }; | |
1da177e4 LT |
881 | |
882 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
883 | ||
884 | /* | |
885 | * standard bounce addresses: | |
886 | * | |
887 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
888 | * BLK_BOUNCE_ANY : don't bounce anything | |
889 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
890 | */ | |
2472892a AK |
891 | |
892 | #if BITS_PER_LONG == 32 | |
1da177e4 | 893 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
894 | #else |
895 | #define BLK_BOUNCE_HIGH -1ULL | |
896 | #endif | |
897 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 898 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 899 | |
3d6392cf JA |
900 | /* |
901 | * default timeout for SG_IO if none specified | |
902 | */ | |
903 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 904 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 905 | |
152e283f FT |
906 | struct rq_map_data { |
907 | struct page **pages; | |
908 | int page_order; | |
909 | int nr_entries; | |
56c451f4 | 910 | unsigned long offset; |
97ae77a1 | 911 | int null_mapped; |
ecb554a8 | 912 | int from_user; |
152e283f FT |
913 | }; |
914 | ||
5705f702 | 915 | struct req_iterator { |
7988613b | 916 | struct bvec_iter iter; |
5705f702 N |
917 | struct bio *bio; |
918 | }; | |
919 | ||
920 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
921 | #define for_each_bio(_bio) \ |
922 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 923 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
924 | if ((rq->bio)) \ |
925 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
926 | ||
5705f702 N |
927 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
928 | __rq_for_each_bio(_iter.bio, _rq) \ | |
7988613b | 929 | bio_for_each_segment(bvl, _iter.bio, _iter.iter) |
5705f702 | 930 | |
4550dd6c | 931 | #define rq_iter_last(bvec, _iter) \ |
7988613b | 932 | (_iter.bio->bi_next == NULL && \ |
4550dd6c | 933 | bio_iter_last(bvec, _iter.iter)) |
5705f702 | 934 | |
2d4dc890 IL |
935 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
936 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
937 | #endif | |
938 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
939 | extern void rq_flush_dcache_pages(struct request *rq); | |
940 | #else | |
941 | static inline void rq_flush_dcache_pages(struct request *rq) | |
942 | { | |
943 | } | |
944 | #endif | |
945 | ||
1da177e4 LT |
946 | extern int blk_register_queue(struct gendisk *disk); |
947 | extern void blk_unregister_queue(struct gendisk *disk); | |
dece1635 | 948 | extern blk_qc_t generic_make_request(struct bio *bio); |
f421e1d9 | 949 | extern blk_qc_t direct_make_request(struct bio *bio); |
2a4aa30c | 950 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
da8d7f07 | 951 | extern void blk_init_request_from_bio(struct request *req, struct bio *bio); |
1da177e4 | 952 | extern void blk_put_request(struct request *); |
165125e1 | 953 | extern void __blk_put_request(struct request_queue *, struct request *); |
6a15674d BVA |
954 | extern struct request *blk_get_request_flags(struct request_queue *, |
955 | unsigned int op, | |
9a95e4ef | 956 | blk_mq_req_flags_t flags); |
cd6ce148 BVA |
957 | extern struct request *blk_get_request(struct request_queue *, unsigned int op, |
958 | gfp_t gfp_mask); | |
165125e1 | 959 | extern void blk_requeue_request(struct request_queue *, struct request *); |
ef9e3fac | 960 | extern int blk_lld_busy(struct request_queue *q); |
78d8e58a MS |
961 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
962 | struct bio_set *bs, gfp_t gfp_mask, | |
963 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
964 | void *data); | |
965 | extern void blk_rq_unprep_clone(struct request *rq); | |
2a842aca | 966 | extern blk_status_t blk_insert_cloned_request(struct request_queue *q, |
82124d60 | 967 | struct request *rq); |
0abc2a10 | 968 | extern int blk_rq_append_bio(struct request *rq, struct bio **bio); |
3cca6dc1 | 969 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
af67c31f | 970 | extern void blk_queue_split(struct request_queue *, struct bio **); |
165125e1 | 971 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 972 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
973 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
974 | unsigned int, void __user *); | |
74f3c8af AV |
975 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
976 | unsigned int, void __user *); | |
e915e872 AV |
977 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
978 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 979 | |
9a95e4ef | 980 | extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); |
2e6edc95 | 981 | extern void blk_queue_exit(struct request_queue *q); |
165125e1 | 982 | extern void blk_start_queue(struct request_queue *q); |
21491412 | 983 | extern void blk_start_queue_async(struct request_queue *q); |
165125e1 | 984 | extern void blk_stop_queue(struct request_queue *q); |
1da177e4 | 985 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 986 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 987 | extern void __blk_run_queue(struct request_queue *q); |
a7928c15 | 988 | extern void __blk_run_queue_uncond(struct request_queue *q); |
165125e1 | 989 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 990 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 991 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
992 | struct rq_map_data *, void __user *, unsigned long, |
993 | gfp_t); | |
8e5cfc45 | 994 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
995 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
996 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
26e49cfc KO |
997 | struct rq_map_data *, const struct iov_iter *, |
998 | gfp_t); | |
b7819b92 | 999 | extern void blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 1000 | struct request *, int); |
165125e1 | 1001 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 1002 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 1003 | |
2a842aca CH |
1004 | int blk_status_to_errno(blk_status_t status); |
1005 | blk_status_t errno_to_blk_status(int errno); | |
1006 | ||
ea435e1b | 1007 | bool blk_poll(struct request_queue *q, blk_qc_t cookie); |
05229bee | 1008 | |
165125e1 | 1009 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 | 1010 | { |
ff9ea323 | 1011 | return bdev->bd_disk->queue; /* this is never NULL */ |
1da177e4 LT |
1012 | } |
1013 | ||
5efccd17 | 1014 | /* |
80a761fd TH |
1015 | * blk_rq_pos() : the current sector |
1016 | * blk_rq_bytes() : bytes left in the entire request | |
1017 | * blk_rq_cur_bytes() : bytes left in the current segment | |
1018 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
1019 | * blk_rq_sectors() : sectors left in the entire request | |
1020 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 1021 | */ |
5b93629b TH |
1022 | static inline sector_t blk_rq_pos(const struct request *rq) |
1023 | { | |
a2dec7b3 | 1024 | return rq->__sector; |
2e46e8b2 TH |
1025 | } |
1026 | ||
1027 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
1028 | { | |
a2dec7b3 | 1029 | return rq->__data_len; |
5b93629b TH |
1030 | } |
1031 | ||
2e46e8b2 TH |
1032 | static inline int blk_rq_cur_bytes(const struct request *rq) |
1033 | { | |
1034 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
1035 | } | |
5efccd17 | 1036 | |
80a761fd TH |
1037 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
1038 | ||
5b93629b TH |
1039 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
1040 | { | |
2e46e8b2 | 1041 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
1042 | } |
1043 | ||
1044 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
1045 | { | |
2e46e8b2 | 1046 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
1047 | } |
1048 | ||
2e3258ec CH |
1049 | /* |
1050 | * Some commands like WRITE SAME have a payload or data transfer size which | |
1051 | * is different from the size of the request. Any driver that supports such | |
1052 | * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to | |
1053 | * calculate the data transfer size. | |
1054 | */ | |
1055 | static inline unsigned int blk_rq_payload_bytes(struct request *rq) | |
1056 | { | |
1057 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1058 | return rq->special_vec.bv_len; | |
1059 | return blk_rq_bytes(rq); | |
1060 | } | |
1061 | ||
f31dc1cd | 1062 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
8fe0d473 | 1063 | int op) |
f31dc1cd | 1064 | { |
7afafc8a | 1065 | if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) |
871dd928 | 1066 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 1067 | |
8fe0d473 | 1068 | if (unlikely(op == REQ_OP_WRITE_SAME)) |
4363ac7c MP |
1069 | return q->limits.max_write_same_sectors; |
1070 | ||
a6f0788e CK |
1071 | if (unlikely(op == REQ_OP_WRITE_ZEROES)) |
1072 | return q->limits.max_write_zeroes_sectors; | |
1073 | ||
f31dc1cd MP |
1074 | return q->limits.max_sectors; |
1075 | } | |
1076 | ||
762380ad JA |
1077 | /* |
1078 | * Return maximum size of a request at given offset. Only valid for | |
1079 | * file system requests. | |
1080 | */ | |
1081 | static inline unsigned int blk_max_size_offset(struct request_queue *q, | |
1082 | sector_t offset) | |
1083 | { | |
1084 | if (!q->limits.chunk_sectors) | |
736ed4de | 1085 | return q->limits.max_sectors; |
762380ad | 1086 | |
db8bced6 KB |
1087 | return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - |
1088 | (offset & (q->limits.chunk_sectors - 1)))); | |
762380ad JA |
1089 | } |
1090 | ||
17007f39 DLM |
1091 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq, |
1092 | sector_t offset) | |
f31dc1cd MP |
1093 | { |
1094 | struct request_queue *q = rq->q; | |
1095 | ||
57292b58 | 1096 | if (blk_rq_is_passthrough(rq)) |
f31dc1cd MP |
1097 | return q->limits.max_hw_sectors; |
1098 | ||
7afafc8a AH |
1099 | if (!q->limits.chunk_sectors || |
1100 | req_op(rq) == REQ_OP_DISCARD || | |
1101 | req_op(rq) == REQ_OP_SECURE_ERASE) | |
8fe0d473 | 1102 | return blk_queue_get_max_sectors(q, req_op(rq)); |
762380ad | 1103 | |
17007f39 | 1104 | return min(blk_max_size_offset(q, offset), |
8fe0d473 | 1105 | blk_queue_get_max_sectors(q, req_op(rq))); |
f31dc1cd MP |
1106 | } |
1107 | ||
75afb352 JN |
1108 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
1109 | { | |
1110 | unsigned int nr_bios = 0; | |
1111 | struct bio *bio; | |
1112 | ||
1113 | __rq_for_each_bio(bio, rq) | |
1114 | nr_bios++; | |
1115 | ||
1116 | return nr_bios; | |
1117 | } | |
1118 | ||
9934c8c0 TH |
1119 | /* |
1120 | * Request issue related functions. | |
1121 | */ | |
1122 | extern struct request *blk_peek_request(struct request_queue *q); | |
1123 | extern void blk_start_request(struct request *rq); | |
1124 | extern struct request *blk_fetch_request(struct request_queue *q); | |
1125 | ||
ef71de8b CH |
1126 | void blk_steal_bios(struct bio_list *list, struct request *rq); |
1127 | ||
1da177e4 | 1128 | /* |
2e60e022 TH |
1129 | * Request completion related functions. |
1130 | * | |
1131 | * blk_update_request() completes given number of bytes and updates | |
1132 | * the request without completing it. | |
1133 | * | |
f06d9a2b TH |
1134 | * blk_end_request() and friends. __blk_end_request() must be called |
1135 | * with the request queue spinlock acquired. | |
1da177e4 LT |
1136 | * |
1137 | * Several drivers define their own end_request and call | |
3bcddeac KU |
1138 | * blk_end_request() for parts of the original function. |
1139 | * This prevents code duplication in drivers. | |
1da177e4 | 1140 | */ |
2a842aca | 1141 | extern bool blk_update_request(struct request *rq, blk_status_t error, |
2e60e022 | 1142 | unsigned int nr_bytes); |
2a842aca CH |
1143 | extern void blk_finish_request(struct request *rq, blk_status_t error); |
1144 | extern bool blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1145 | unsigned int nr_bytes); |
2a842aca CH |
1146 | extern void blk_end_request_all(struct request *rq, blk_status_t error); |
1147 | extern bool __blk_end_request(struct request *rq, blk_status_t error, | |
b1f74493 | 1148 | unsigned int nr_bytes); |
2a842aca CH |
1149 | extern void __blk_end_request_all(struct request *rq, blk_status_t error); |
1150 | extern bool __blk_end_request_cur(struct request *rq, blk_status_t error); | |
2e60e022 | 1151 | |
ff856bad | 1152 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
1153 | extern void __blk_complete_request(struct request *); |
1154 | extern void blk_abort_request(struct request *); | |
28018c24 | 1155 | extern void blk_unprep_request(struct request *); |
ff856bad | 1156 | |
1da177e4 LT |
1157 | /* |
1158 | * Access functions for manipulating queue properties | |
1159 | */ | |
165125e1 | 1160 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 1161 | spinlock_t *lock, int node_id); |
165125e1 | 1162 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
5ea708d1 | 1163 | extern int blk_init_allocated_queue(struct request_queue *); |
165125e1 JA |
1164 | extern void blk_cleanup_queue(struct request_queue *); |
1165 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
1166 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 1167 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
762380ad | 1168 | extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); |
8a78362c | 1169 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
1e739730 CH |
1170 | extern void blk_queue_max_discard_segments(struct request_queue *, |
1171 | unsigned short); | |
165125e1 | 1172 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
1173 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
1174 | unsigned int max_discard_sectors); | |
4363ac7c MP |
1175 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
1176 | unsigned int max_write_same_sectors); | |
a6f0788e CK |
1177 | extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, |
1178 | unsigned int max_write_same_sectors); | |
e1defc4f | 1179 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 1180 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
1181 | extern void blk_queue_alignment_offset(struct request_queue *q, |
1182 | unsigned int alignment); | |
7c958e32 | 1183 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 1184 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 1185 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 1186 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
d278d4a8 | 1187 | extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); |
e475bba2 | 1188 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 1189 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
1190 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
1191 | sector_t offset); | |
17be8c24 MP |
1192 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
1193 | sector_t offset); | |
c72758f3 MP |
1194 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
1195 | sector_t offset); | |
165125e1 | 1196 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 1197 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 1198 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
1199 | extern int blk_queue_dma_drain(struct request_queue *q, |
1200 | dma_drain_needed_fn *dma_drain_needed, | |
1201 | void *buf, unsigned int size); | |
ef9e3fac | 1202 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 | 1203 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
03100aad | 1204 | extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); |
165125e1 | 1205 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); |
28018c24 | 1206 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 | 1207 | extern void blk_queue_dma_alignment(struct request_queue *, int); |
11c3e689 | 1208 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 1209 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
1210 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
1211 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
f3876930 | 1212 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
93e9d8e8 | 1213 | extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); |
1da177e4 | 1214 | |
1e739730 CH |
1215 | /* |
1216 | * Number of physical segments as sent to the device. | |
1217 | * | |
1218 | * Normally this is the number of discontiguous data segments sent by the | |
1219 | * submitter. But for data-less command like discard we might have no | |
1220 | * actual data segments submitted, but the driver might have to add it's | |
1221 | * own special payload. In that case we still return 1 here so that this | |
1222 | * special payload will be mapped. | |
1223 | */ | |
f9d03f96 CH |
1224 | static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) |
1225 | { | |
1226 | if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) | |
1227 | return 1; | |
1228 | return rq->nr_phys_segments; | |
1229 | } | |
1230 | ||
1e739730 CH |
1231 | /* |
1232 | * Number of discard segments (or ranges) the driver needs to fill in. | |
1233 | * Each discard bio merged into a request is counted as one segment. | |
1234 | */ | |
1235 | static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) | |
1236 | { | |
1237 | return max_t(unsigned short, rq->nr_phys_segments, 1); | |
1238 | } | |
1239 | ||
165125e1 | 1240 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1241 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 1242 | extern long nr_blockdev_pages(void); |
1da177e4 | 1243 | |
09ac46c4 | 1244 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
1245 | struct request_queue *blk_alloc_queue(gfp_t); |
1246 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1247 | extern void blk_put_queue(struct request_queue *); | |
3f21c265 | 1248 | extern void blk_set_queue_dying(struct request_queue *); |
1da177e4 | 1249 | |
6c954667 LM |
1250 | /* |
1251 | * block layer runtime pm functions | |
1252 | */ | |
47fafbc7 | 1253 | #ifdef CONFIG_PM |
6c954667 LM |
1254 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); |
1255 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
1256 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
1257 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
1258 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
d07ab6d1 | 1259 | extern void blk_set_runtime_active(struct request_queue *q); |
6c954667 LM |
1260 | #else |
1261 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
1262 | struct device *dev) {} | |
1263 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
1264 | { | |
1265 | return -ENOSYS; | |
1266 | } | |
1267 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
1268 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
1269 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
9a05e754 | 1270 | static inline void blk_set_runtime_active(struct request_queue *q) {} |
6c954667 LM |
1271 | #endif |
1272 | ||
316cc67d | 1273 | /* |
75df7136 SJ |
1274 | * blk_plug permits building a queue of related requests by holding the I/O |
1275 | * fragments for a short period. This allows merging of sequential requests | |
1276 | * into single larger request. As the requests are moved from a per-task list to | |
1277 | * the device's request_queue in a batch, this results in improved scalability | |
1278 | * as the lock contention for request_queue lock is reduced. | |
1279 | * | |
1280 | * It is ok not to disable preemption when adding the request to the plug list | |
1281 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1282 | * the plug list when the task sleeps by itself. For details, please see | |
1283 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1284 | */ |
73c10101 | 1285 | struct blk_plug { |
75df7136 | 1286 | struct list_head list; /* requests */ |
320ae51f | 1287 | struct list_head mq_list; /* blk-mq requests */ |
75df7136 | 1288 | struct list_head cb_list; /* md requires an unplug callback */ |
73c10101 | 1289 | }; |
55c022bb | 1290 | #define BLK_MAX_REQUEST_COUNT 16 |
50d24c34 | 1291 | #define BLK_PLUG_FLUSH_SIZE (128 * 1024) |
55c022bb | 1292 | |
9cbb1750 | 1293 | struct blk_plug_cb; |
74018dc3 | 1294 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1295 | struct blk_plug_cb { |
1296 | struct list_head list; | |
9cbb1750 N |
1297 | blk_plug_cb_fn callback; |
1298 | void *data; | |
048c9374 | 1299 | }; |
9cbb1750 N |
1300 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1301 | void *data, int size); | |
73c10101 JA |
1302 | extern void blk_start_plug(struct blk_plug *); |
1303 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1304 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1305 | |
1306 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1307 | { | |
1308 | struct blk_plug *plug = tsk->plug; | |
1309 | ||
a237c1c5 JA |
1310 | if (plug) |
1311 | blk_flush_plug_list(plug, false); | |
1312 | } | |
1313 | ||
1314 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1315 | { | |
1316 | struct blk_plug *plug = tsk->plug; | |
1317 | ||
88b996cd | 1318 | if (plug) |
f6603783 | 1319 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1320 | } |
1321 | ||
1322 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1323 | { | |
1324 | struct blk_plug *plug = tsk->plug; | |
1325 | ||
320ae51f JA |
1326 | return plug && |
1327 | (!list_empty(&plug->list) || | |
1328 | !list_empty(&plug->mq_list) || | |
1329 | !list_empty(&plug->cb_list)); | |
73c10101 JA |
1330 | } |
1331 | ||
1da177e4 LT |
1332 | /* |
1333 | * tag stuff | |
1334 | */ | |
165125e1 JA |
1335 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1336 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1337 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
ee1b6f7a | 1338 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int); |
165125e1 JA |
1339 | extern void blk_queue_free_tags(struct request_queue *); |
1340 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1341 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
ee1b6f7a | 1342 | extern struct blk_queue_tag *blk_init_tags(int, int); |
492dfb48 | 1343 | extern void blk_free_tags(struct blk_queue_tag *); |
1da177e4 | 1344 | |
f583f492 DS |
1345 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1346 | int tag) | |
1347 | { | |
1348 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1349 | return NULL; | |
1350 | return bqt->tag_index[tag]; | |
1351 | } | |
dd3932ed | 1352 | |
ee472d83 CH |
1353 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); |
1354 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, | |
1355 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
e950fdf7 CH |
1356 | |
1357 | #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ | |
dd3932ed | 1358 | |
fbd9b09a DM |
1359 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1360 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
38f25255 | 1361 | extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
288dab8a | 1362 | sector_t nr_sects, gfp_t gfp_mask, int flags, |
469e3216 | 1363 | struct bio **biop); |
ee472d83 CH |
1364 | |
1365 | #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ | |
cb365b96 | 1366 | #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ |
ee472d83 | 1367 | |
e73c23ff CK |
1368 | extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1369 | sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, | |
ee472d83 | 1370 | unsigned flags); |
3f14d792 | 1371 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
ee472d83 CH |
1372 | sector_t nr_sects, gfp_t gfp_mask, unsigned flags); |
1373 | ||
2cf6d26a CH |
1374 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1375 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1376 | { |
2cf6d26a CH |
1377 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1378 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1379 | gfp_mask, flags); | |
fb2dce86 | 1380 | } |
e6fa0be6 | 1381 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1382 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1383 | { |
1384 | return blkdev_issue_zeroout(sb->s_bdev, | |
1385 | block << (sb->s_blocksize_bits - 9), | |
1386 | nr_blocks << (sb->s_blocksize_bits - 9), | |
ee472d83 | 1387 | gfp_mask, 0); |
e6fa0be6 | 1388 | } |
1da177e4 | 1389 | |
f00c4d80 | 1390 | extern int blk_verify_command(unsigned char *cmd, fmode_t mode); |
0b07de85 | 1391 | |
eb28d31b MP |
1392 | enum blk_default_limits { |
1393 | BLK_MAX_SEGMENTS = 128, | |
1394 | BLK_SAFE_MAX_SECTORS = 255, | |
d2be537c | 1395 | BLK_DEF_MAX_SECTORS = 2560, |
eb28d31b MP |
1396 | BLK_MAX_SEGMENT_SIZE = 65536, |
1397 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1398 | }; | |
0e435ac2 | 1399 | |
1da177e4 LT |
1400 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1401 | ||
ae03bf63 MP |
1402 | static inline unsigned long queue_segment_boundary(struct request_queue *q) |
1403 | { | |
025146e1 | 1404 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1405 | } |
1406 | ||
03100aad KB |
1407 | static inline unsigned long queue_virt_boundary(struct request_queue *q) |
1408 | { | |
1409 | return q->limits.virt_boundary_mask; | |
1410 | } | |
1411 | ||
ae03bf63 MP |
1412 | static inline unsigned int queue_max_sectors(struct request_queue *q) |
1413 | { | |
025146e1 | 1414 | return q->limits.max_sectors; |
ae03bf63 MP |
1415 | } |
1416 | ||
1417 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1418 | { | |
025146e1 | 1419 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1420 | } |
1421 | ||
8a78362c | 1422 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1423 | { |
8a78362c | 1424 | return q->limits.max_segments; |
ae03bf63 MP |
1425 | } |
1426 | ||
1e739730 CH |
1427 | static inline unsigned short queue_max_discard_segments(struct request_queue *q) |
1428 | { | |
1429 | return q->limits.max_discard_segments; | |
1430 | } | |
1431 | ||
ae03bf63 MP |
1432 | static inline unsigned int queue_max_segment_size(struct request_queue *q) |
1433 | { | |
025146e1 | 1434 | return q->limits.max_segment_size; |
ae03bf63 MP |
1435 | } |
1436 | ||
e1defc4f | 1437 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1438 | { |
1439 | int retval = 512; | |
1440 | ||
025146e1 MP |
1441 | if (q && q->limits.logical_block_size) |
1442 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1443 | |
1444 | return retval; | |
1445 | } | |
1446 | ||
e1defc4f | 1447 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1448 | { |
e1defc4f | 1449 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1450 | } |
1451 | ||
c72758f3 MP |
1452 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1453 | { | |
1454 | return q->limits.physical_block_size; | |
1455 | } | |
1456 | ||
892b6f90 | 1457 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1458 | { |
1459 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1460 | } | |
1461 | ||
c72758f3 MP |
1462 | static inline unsigned int queue_io_min(struct request_queue *q) |
1463 | { | |
1464 | return q->limits.io_min; | |
1465 | } | |
1466 | ||
ac481c20 MP |
1467 | static inline int bdev_io_min(struct block_device *bdev) |
1468 | { | |
1469 | return queue_io_min(bdev_get_queue(bdev)); | |
1470 | } | |
1471 | ||
c72758f3 MP |
1472 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1473 | { | |
1474 | return q->limits.io_opt; | |
1475 | } | |
1476 | ||
ac481c20 MP |
1477 | static inline int bdev_io_opt(struct block_device *bdev) |
1478 | { | |
1479 | return queue_io_opt(bdev_get_queue(bdev)); | |
1480 | } | |
1481 | ||
c72758f3 MP |
1482 | static inline int queue_alignment_offset(struct request_queue *q) |
1483 | { | |
ac481c20 | 1484 | if (q->limits.misaligned) |
c72758f3 MP |
1485 | return -1; |
1486 | ||
ac481c20 | 1487 | return q->limits.alignment_offset; |
c72758f3 MP |
1488 | } |
1489 | ||
e03a72e1 | 1490 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1491 | { |
1492 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
b8839b8c | 1493 | unsigned int alignment = sector_div(sector, granularity >> 9) << 9; |
81744ee4 | 1494 | |
b8839b8c | 1495 | return (granularity + lim->alignment_offset - alignment) % granularity; |
c72758f3 MP |
1496 | } |
1497 | ||
ac481c20 MP |
1498 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1499 | { | |
1500 | struct request_queue *q = bdev_get_queue(bdev); | |
1501 | ||
1502 | if (q->limits.misaligned) | |
1503 | return -1; | |
1504 | ||
1505 | if (bdev != bdev->bd_contains) | |
1506 | return bdev->bd_part->alignment_offset; | |
1507 | ||
1508 | return q->limits.alignment_offset; | |
1509 | } | |
1510 | ||
86b37281 MP |
1511 | static inline int queue_discard_alignment(struct request_queue *q) |
1512 | { | |
1513 | if (q->limits.discard_misaligned) | |
1514 | return -1; | |
1515 | ||
1516 | return q->limits.discard_alignment; | |
1517 | } | |
1518 | ||
e03a72e1 | 1519 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1520 | { |
59771079 | 1521 | unsigned int alignment, granularity, offset; |
dd3d145d | 1522 | |
a934a00a MP |
1523 | if (!lim->max_discard_sectors) |
1524 | return 0; | |
1525 | ||
59771079 LT |
1526 | /* Why are these in bytes, not sectors? */ |
1527 | alignment = lim->discard_alignment >> 9; | |
1528 | granularity = lim->discard_granularity >> 9; | |
1529 | if (!granularity) | |
1530 | return 0; | |
1531 | ||
1532 | /* Offset of the partition start in 'granularity' sectors */ | |
1533 | offset = sector_div(sector, granularity); | |
1534 | ||
1535 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1536 | offset = (granularity + alignment - offset) % granularity; | |
1537 | ||
1538 | /* Turn it back into bytes, gaah */ | |
1539 | return offset << 9; | |
86b37281 MP |
1540 | } |
1541 | ||
c6e66634 PB |
1542 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1543 | { | |
1544 | struct request_queue *q = bdev_get_queue(bdev); | |
1545 | ||
1546 | if (bdev != bdev->bd_contains) | |
1547 | return bdev->bd_part->discard_alignment; | |
1548 | ||
1549 | return q->limits.discard_alignment; | |
1550 | } | |
1551 | ||
4363ac7c MP |
1552 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1553 | { | |
1554 | struct request_queue *q = bdev_get_queue(bdev); | |
1555 | ||
1556 | if (q) | |
1557 | return q->limits.max_write_same_sectors; | |
1558 | ||
1559 | return 0; | |
1560 | } | |
1561 | ||
a6f0788e CK |
1562 | static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) |
1563 | { | |
1564 | struct request_queue *q = bdev_get_queue(bdev); | |
1565 | ||
1566 | if (q) | |
1567 | return q->limits.max_write_zeroes_sectors; | |
1568 | ||
1569 | return 0; | |
1570 | } | |
1571 | ||
797476b8 DLM |
1572 | static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) |
1573 | { | |
1574 | struct request_queue *q = bdev_get_queue(bdev); | |
1575 | ||
1576 | if (q) | |
1577 | return blk_queue_zoned_model(q); | |
1578 | ||
1579 | return BLK_ZONED_NONE; | |
1580 | } | |
1581 | ||
1582 | static inline bool bdev_is_zoned(struct block_device *bdev) | |
1583 | { | |
1584 | struct request_queue *q = bdev_get_queue(bdev); | |
1585 | ||
1586 | if (q) | |
1587 | return blk_queue_is_zoned(q); | |
1588 | ||
1589 | return false; | |
1590 | } | |
1591 | ||
f99e8648 | 1592 | static inline unsigned int bdev_zone_sectors(struct block_device *bdev) |
6a0cb1bc HR |
1593 | { |
1594 | struct request_queue *q = bdev_get_queue(bdev); | |
1595 | ||
1596 | if (q) | |
f99e8648 | 1597 | return blk_queue_zone_sectors(q); |
6a0cb1bc HR |
1598 | |
1599 | return 0; | |
1600 | } | |
1601 | ||
165125e1 | 1602 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1603 | { |
482eb689 | 1604 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1605 | } |
1606 | ||
14417799 | 1607 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1608 | unsigned int len) |
1609 | { | |
1610 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1611 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1612 | } |
1613 | ||
1da177e4 LT |
1614 | /* assumes size > 256 */ |
1615 | static inline unsigned int blksize_bits(unsigned int size) | |
1616 | { | |
1617 | unsigned int bits = 8; | |
1618 | do { | |
1619 | bits++; | |
1620 | size >>= 1; | |
1621 | } while (size > 256); | |
1622 | return bits; | |
1623 | } | |
1624 | ||
2befb9e3 | 1625 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1626 | { |
1627 | return bdev->bd_block_size; | |
1628 | } | |
1629 | ||
f3876930 | 1630 | static inline bool queue_flush_queueable(struct request_queue *q) |
1631 | { | |
c888a8f9 | 1632 | return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags); |
f3876930 | 1633 | } |
1634 | ||
1da177e4 LT |
1635 | typedef struct {struct page *v;} Sector; |
1636 | ||
1637 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1638 | ||
1639 | static inline void put_dev_sector(Sector p) | |
1640 | { | |
09cbfeaf | 1641 | put_page(p.v); |
1da177e4 LT |
1642 | } |
1643 | ||
e0af2917 ML |
1644 | static inline bool __bvec_gap_to_prev(struct request_queue *q, |
1645 | struct bio_vec *bprv, unsigned int offset) | |
1646 | { | |
1647 | return offset || | |
1648 | ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q)); | |
1649 | } | |
1650 | ||
03100aad KB |
1651 | /* |
1652 | * Check if adding a bio_vec after bprv with offset would create a gap in | |
1653 | * the SG list. Most drivers don't care about this, but some do. | |
1654 | */ | |
1655 | static inline bool bvec_gap_to_prev(struct request_queue *q, | |
1656 | struct bio_vec *bprv, unsigned int offset) | |
1657 | { | |
1658 | if (!queue_virt_boundary(q)) | |
1659 | return false; | |
e0af2917 | 1660 | return __bvec_gap_to_prev(q, bprv, offset); |
03100aad KB |
1661 | } |
1662 | ||
729204ef ML |
1663 | /* |
1664 | * Check if the two bvecs from two bios can be merged to one segment. | |
1665 | * If yes, no need to check gap between the two bios since the 1st bio | |
1666 | * and the 1st bvec in the 2nd bio can be handled in one segment. | |
1667 | */ | |
1668 | static inline bool bios_segs_mergeable(struct request_queue *q, | |
1669 | struct bio *prev, struct bio_vec *prev_last_bv, | |
1670 | struct bio_vec *next_first_bv) | |
1671 | { | |
1672 | if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv)) | |
1673 | return false; | |
1674 | if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv)) | |
1675 | return false; | |
1676 | if (prev->bi_seg_back_size + next_first_bv->bv_len > | |
1677 | queue_max_segment_size(q)) | |
1678 | return false; | |
1679 | return true; | |
1680 | } | |
1681 | ||
5a8d75a1 ML |
1682 | static inline bool bio_will_gap(struct request_queue *q, |
1683 | struct request *prev_rq, | |
1684 | struct bio *prev, | |
1685 | struct bio *next) | |
5e7c4274 | 1686 | { |
25e71a99 ML |
1687 | if (bio_has_data(prev) && queue_virt_boundary(q)) { |
1688 | struct bio_vec pb, nb; | |
1689 | ||
5a8d75a1 ML |
1690 | /* |
1691 | * don't merge if the 1st bio starts with non-zero | |
1692 | * offset, otherwise it is quite difficult to respect | |
1693 | * sg gap limit. We work hard to merge a huge number of small | |
1694 | * single bios in case of mkfs. | |
1695 | */ | |
1696 | if (prev_rq) | |
1697 | bio_get_first_bvec(prev_rq->bio, &pb); | |
1698 | else | |
1699 | bio_get_first_bvec(prev, &pb); | |
1700 | if (pb.bv_offset) | |
1701 | return true; | |
1702 | ||
1703 | /* | |
1704 | * We don't need to worry about the situation that the | |
1705 | * merged segment ends in unaligned virt boundary: | |
1706 | * | |
1707 | * - if 'pb' ends aligned, the merged segment ends aligned | |
1708 | * - if 'pb' ends unaligned, the next bio must include | |
1709 | * one single bvec of 'nb', otherwise the 'nb' can't | |
1710 | * merge with 'pb' | |
1711 | */ | |
25e71a99 ML |
1712 | bio_get_last_bvec(prev, &pb); |
1713 | bio_get_first_bvec(next, &nb); | |
5e7c4274 | 1714 | |
729204ef ML |
1715 | if (!bios_segs_mergeable(q, prev, &pb, &nb)) |
1716 | return __bvec_gap_to_prev(q, &pb, nb.bv_offset); | |
25e71a99 ML |
1717 | } |
1718 | ||
1719 | return false; | |
5e7c4274 JA |
1720 | } |
1721 | ||
1722 | static inline bool req_gap_back_merge(struct request *req, struct bio *bio) | |
1723 | { | |
5a8d75a1 | 1724 | return bio_will_gap(req->q, req, req->biotail, bio); |
5e7c4274 JA |
1725 | } |
1726 | ||
1727 | static inline bool req_gap_front_merge(struct request *req, struct bio *bio) | |
1728 | { | |
5a8d75a1 | 1729 | return bio_will_gap(req->q, NULL, bio, req->bio); |
5e7c4274 JA |
1730 | } |
1731 | ||
59c3d45e | 1732 | int kblockd_schedule_work(struct work_struct *work); |
ee63cfa7 | 1733 | int kblockd_schedule_work_on(int cpu, struct work_struct *work); |
59c3d45e | 1734 | int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay); |
8ab14595 | 1735 | int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
818cd1cb | 1736 | int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1737 | |
9195291e | 1738 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1739 | /* |
1740 | * This should not be using sched_clock(). A real patch is in progress | |
1741 | * to fix this up, until that is in place we need to disable preemption | |
1742 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1743 | */ | |
9195291e DS |
1744 | static inline void set_start_time_ns(struct request *req) |
1745 | { | |
28f4197e | 1746 | preempt_disable(); |
9195291e | 1747 | req->start_time_ns = sched_clock(); |
28f4197e | 1748 | preempt_enable(); |
9195291e DS |
1749 | } |
1750 | ||
1751 | static inline void set_io_start_time_ns(struct request *req) | |
1752 | { | |
28f4197e | 1753 | preempt_disable(); |
9195291e | 1754 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1755 | preempt_enable(); |
9195291e | 1756 | } |
84c124da DS |
1757 | |
1758 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1759 | { | |
1760 | return req->start_time_ns; | |
1761 | } | |
1762 | ||
1763 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1764 | { | |
1765 | return req->io_start_time_ns; | |
1766 | } | |
9195291e DS |
1767 | #else |
1768 | static inline void set_start_time_ns(struct request *req) {} | |
1769 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1770 | static inline uint64_t rq_start_time_ns(struct request *req) |
1771 | { | |
1772 | return 0; | |
1773 | } | |
1774 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1775 | { | |
1776 | return 0; | |
1777 | } | |
9195291e DS |
1778 | #endif |
1779 | ||
1da177e4 LT |
1780 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1781 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1782 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1783 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1784 | ||
7ba1ba12 MP |
1785 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1786 | ||
8288f496 MP |
1787 | enum blk_integrity_flags { |
1788 | BLK_INTEGRITY_VERIFY = 1 << 0, | |
1789 | BLK_INTEGRITY_GENERATE = 1 << 1, | |
3aec2f41 | 1790 | BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, |
aae7df50 | 1791 | BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, |
8288f496 | 1792 | }; |
7ba1ba12 | 1793 | |
18593088 | 1794 | struct blk_integrity_iter { |
7ba1ba12 MP |
1795 | void *prot_buf; |
1796 | void *data_buf; | |
3be91c4a | 1797 | sector_t seed; |
7ba1ba12 | 1798 | unsigned int data_size; |
3be91c4a | 1799 | unsigned short interval; |
7ba1ba12 MP |
1800 | const char *disk_name; |
1801 | }; | |
1802 | ||
4e4cbee9 | 1803 | typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); |
7ba1ba12 | 1804 | |
0f8087ec MP |
1805 | struct blk_integrity_profile { |
1806 | integrity_processing_fn *generate_fn; | |
1807 | integrity_processing_fn *verify_fn; | |
1808 | const char *name; | |
1809 | }; | |
7ba1ba12 | 1810 | |
25520d55 | 1811 | extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); |
7ba1ba12 | 1812 | extern void blk_integrity_unregister(struct gendisk *); |
ad7fce93 | 1813 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1814 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1815 | struct scatterlist *); | |
1816 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
4eaf99be MP |
1817 | extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, |
1818 | struct request *); | |
1819 | extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1820 | struct bio *); | |
7ba1ba12 | 1821 | |
25520d55 | 1822 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
b04accc4 | 1823 | { |
ac6fc48c | 1824 | struct blk_integrity *bi = &disk->queue->integrity; |
25520d55 MP |
1825 | |
1826 | if (!bi->profile) | |
1827 | return NULL; | |
1828 | ||
1829 | return bi; | |
b04accc4 JA |
1830 | } |
1831 | ||
25520d55 MP |
1832 | static inline |
1833 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
b02739b0 | 1834 | { |
25520d55 | 1835 | return blk_get_integrity(bdev->bd_disk); |
b02739b0 MP |
1836 | } |
1837 | ||
180b2f95 | 1838 | static inline bool blk_integrity_rq(struct request *rq) |
7ba1ba12 | 1839 | { |
180b2f95 | 1840 | return rq->cmd_flags & REQ_INTEGRITY; |
7ba1ba12 MP |
1841 | } |
1842 | ||
13f05c8d MP |
1843 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1844 | unsigned int segs) | |
1845 | { | |
1846 | q->limits.max_integrity_segments = segs; | |
1847 | } | |
1848 | ||
1849 | static inline unsigned short | |
1850 | queue_max_integrity_segments(struct request_queue *q) | |
1851 | { | |
1852 | return q->limits.max_integrity_segments; | |
1853 | } | |
1854 | ||
7f39add3 SG |
1855 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1856 | struct bio *next) | |
1857 | { | |
1858 | struct bio_integrity_payload *bip = bio_integrity(req->bio); | |
1859 | struct bio_integrity_payload *bip_next = bio_integrity(next); | |
1860 | ||
1861 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1862 | bip_next->bip_vec[0].bv_offset); | |
1863 | } | |
1864 | ||
1865 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1866 | struct bio *bio) | |
1867 | { | |
1868 | struct bio_integrity_payload *bip = bio_integrity(bio); | |
1869 | struct bio_integrity_payload *bip_next = bio_integrity(req->bio); | |
1870 | ||
1871 | return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1], | |
1872 | bip_next->bip_vec[0].bv_offset); | |
1873 | } | |
1874 | ||
7ba1ba12 MP |
1875 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1876 | ||
fd83240a SR |
1877 | struct bio; |
1878 | struct block_device; | |
1879 | struct gendisk; | |
1880 | struct blk_integrity; | |
1881 | ||
1882 | static inline int blk_integrity_rq(struct request *rq) | |
1883 | { | |
1884 | return 0; | |
1885 | } | |
1886 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1887 | struct bio *b) | |
1888 | { | |
1889 | return 0; | |
1890 | } | |
1891 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1892 | struct bio *b, | |
1893 | struct scatterlist *s) | |
1894 | { | |
1895 | return 0; | |
1896 | } | |
1897 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1898 | { | |
61a04e5b | 1899 | return NULL; |
fd83240a SR |
1900 | } |
1901 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1902 | { | |
1903 | return NULL; | |
1904 | } | |
1905 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1906 | { | |
1907 | return 0; | |
1908 | } | |
25520d55 | 1909 | static inline void blk_integrity_register(struct gendisk *d, |
fd83240a SR |
1910 | struct blk_integrity *b) |
1911 | { | |
fd83240a SR |
1912 | } |
1913 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1914 | { | |
1915 | } | |
1916 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1917 | unsigned int segs) | |
1918 | { | |
1919 | } | |
1920 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1921 | { | |
1922 | return 0; | |
1923 | } | |
4eaf99be MP |
1924 | static inline bool blk_integrity_merge_rq(struct request_queue *rq, |
1925 | struct request *r1, | |
1926 | struct request *r2) | |
fd83240a | 1927 | { |
cb1a5ab6 | 1928 | return true; |
fd83240a | 1929 | } |
4eaf99be MP |
1930 | static inline bool blk_integrity_merge_bio(struct request_queue *rq, |
1931 | struct request *r, | |
1932 | struct bio *b) | |
fd83240a | 1933 | { |
cb1a5ab6 | 1934 | return true; |
fd83240a | 1935 | } |
25520d55 | 1936 | |
7f39add3 SG |
1937 | static inline bool integrity_req_gap_back_merge(struct request *req, |
1938 | struct bio *next) | |
1939 | { | |
1940 | return false; | |
1941 | } | |
1942 | static inline bool integrity_req_gap_front_merge(struct request *req, | |
1943 | struct bio *bio) | |
1944 | { | |
1945 | return false; | |
1946 | } | |
7ba1ba12 MP |
1947 | |
1948 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1949 | ||
08f85851 | 1950 | struct block_device_operations { |
d4430d62 | 1951 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1952 | void (*release) (struct gendisk *, fmode_t); |
c11f0c0b | 1953 | int (*rw_page)(struct block_device *, sector_t, struct page *, bool); |
d4430d62 AV |
1954 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1955 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
77ea887e TH |
1956 | unsigned int (*check_events) (struct gendisk *disk, |
1957 | unsigned int clearing); | |
1958 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1959 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1960 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1961 | int (*revalidate_disk) (struct gendisk *); |
1962 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1963 | /* this callback is with swap_lock and sometimes page table lock held */ |
1964 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 | 1965 | struct module *owner; |
bbd3e064 | 1966 | const struct pr_ops *pr_ops; |
08f85851 AV |
1967 | }; |
1968 | ||
633a08b8 AV |
1969 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1970 | unsigned long); | |
47a191fd MW |
1971 | extern int bdev_read_page(struct block_device *, sector_t, struct page *); |
1972 | extern int bdev_write_page(struct block_device *, sector_t, struct page *, | |
1973 | struct writeback_control *); | |
9361401e | 1974 | #else /* CONFIG_BLOCK */ |
ac13a829 FF |
1975 | |
1976 | struct block_device; | |
1977 | ||
9361401e DH |
1978 | /* |
1979 | * stubs for when the block layer is configured out | |
1980 | */ | |
1981 | #define buffer_heads_over_limit 0 | |
1982 | ||
9361401e DH |
1983 | static inline long nr_blockdev_pages(void) |
1984 | { | |
1985 | return 0; | |
1986 | } | |
1987 | ||
1f940bdf JA |
1988 | struct blk_plug { |
1989 | }; | |
1990 | ||
1991 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1992 | { |
1993 | } | |
1994 | ||
1f940bdf | 1995 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1996 | { |
1997 | } | |
1998 | ||
1f940bdf | 1999 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
2000 | { |
2001 | } | |
2002 | ||
a237c1c5 JA |
2003 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
2004 | { | |
2005 | } | |
2006 | ||
2007 | ||
73c10101 JA |
2008 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
2009 | { | |
2010 | return false; | |
2011 | } | |
2012 | ||
ac13a829 FF |
2013 | static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask, |
2014 | sector_t *error_sector) | |
2015 | { | |
2016 | return 0; | |
2017 | } | |
2018 | ||
9361401e DH |
2019 | #endif /* CONFIG_BLOCK */ |
2020 | ||
1da177e4 | 2021 | #endif |