]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
85fd0bc9 RK |
4 | #include <linux/sched.h> |
5 | ||
f5ff8422 JA |
6 | #ifdef CONFIG_BLOCK |
7 | ||
1da177e4 LT |
8 | #include <linux/major.h> |
9 | #include <linux/genhd.h> | |
10 | #include <linux/list.h> | |
11 | #include <linux/timer.h> | |
12 | #include <linux/workqueue.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/backing-dev.h> | |
15 | #include <linux/wait.h> | |
16 | #include <linux/mempool.h> | |
17 | #include <linux/bio.h> | |
1da177e4 | 18 | #include <linux/stringify.h> |
3e6053d7 | 19 | #include <linux/gfp.h> |
d351af01 | 20 | #include <linux/bsg.h> |
c7c22e4d | 21 | #include <linux/smp.h> |
548bc8e1 | 22 | #include <linux/rcupdate.h> |
1da177e4 LT |
23 | |
24 | #include <asm/scatterlist.h> | |
25 | ||
de477254 | 26 | struct module; |
21b2f0c8 CH |
27 | struct scsi_ioctl_command; |
28 | ||
1da177e4 | 29 | struct request_queue; |
1da177e4 | 30 | struct elevator_queue; |
1da177e4 | 31 | struct request_pm_state; |
2056a782 | 32 | struct blk_trace; |
3d6392cf JA |
33 | struct request; |
34 | struct sg_io_hdr; | |
aa387cc8 | 35 | struct bsg_job; |
3c798398 | 36 | struct blkcg_gq; |
1da177e4 LT |
37 | |
38 | #define BLKDEV_MIN_RQ 4 | |
39 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
40 | ||
8bd435b3 TH |
41 | /* |
42 | * Maximum number of blkcg policies allowed to be registered concurrently. | |
43 | * Defined here to simplify include dependency. | |
44 | */ | |
45 | #define BLKCG_MAX_POLS 2 | |
46 | ||
1da177e4 | 47 | struct request; |
8ffdc655 | 48 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 | 49 | |
5b788ce3 TH |
50 | #define BLK_RL_SYNCFULL (1U << 0) |
51 | #define BLK_RL_ASYNCFULL (1U << 1) | |
52 | ||
1da177e4 | 53 | struct request_list { |
5b788ce3 | 54 | struct request_queue *q; /* the queue this rl belongs to */ |
a051661c TH |
55 | #ifdef CONFIG_BLK_CGROUP |
56 | struct blkcg_gq *blkg; /* blkg this request pool belongs to */ | |
57 | #endif | |
1faa16d2 JA |
58 | /* |
59 | * count[], starved[], and wait[] are indexed by | |
60 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
61 | */ | |
8a5ecdd4 TH |
62 | int count[2]; |
63 | int starved[2]; | |
64 | mempool_t *rq_pool; | |
65 | wait_queue_head_t wait[2]; | |
5b788ce3 | 66 | unsigned int flags; |
1da177e4 LT |
67 | }; |
68 | ||
4aff5e23 JA |
69 | /* |
70 | * request command types | |
71 | */ | |
72 | enum rq_cmd_type_bits { | |
73 | REQ_TYPE_FS = 1, /* fs request */ | |
74 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
75 | REQ_TYPE_SENSE, /* sense request */ | |
76 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
77 | REQ_TYPE_PM_RESUME, /* resume request */ | |
78 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 79 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
80 | /* |
81 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
82 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
83 | * private REQ_LB opcodes to differentiate what type of request this is | |
84 | */ | |
4aff5e23 | 85 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 86 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
87 | }; |
88 | ||
1da177e4 LT |
89 | #define BLK_MAX_CDB 16 |
90 | ||
91 | /* | |
63a71386 | 92 | * try to put the fields that are referenced together in the same cacheline. |
4d0d98b6 | 93 | * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() |
63a71386 | 94 | * as well! |
1da177e4 LT |
95 | */ |
96 | struct request { | |
ff856bad | 97 | struct list_head queuelist; |
c7c22e4d | 98 | struct call_single_data csd; |
ff856bad | 99 | |
165125e1 | 100 | struct request_queue *q; |
e6a1c874 | 101 | |
5953316d | 102 | u64 cmd_flags; |
4aff5e23 | 103 | enum rq_cmd_type_bits cmd_type; |
242f9dcb | 104 | unsigned long atomic_flags; |
1da177e4 | 105 | |
181fdde3 RK |
106 | int cpu; |
107 | ||
a2dec7b3 | 108 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 109 | unsigned int __data_len; /* total data len */ |
181fdde3 | 110 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
111 | |
112 | struct bio *bio; | |
113 | struct bio *biotail; | |
114 | ||
9817064b | 115 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
116 | /* |
117 | * The rb_node is only used inside the io scheduler, requests | |
118 | * are pruned when moved to the dispatch queue. So let the | |
c186794d | 119 | * completion_data share space with the rb_node. |
e6a1c874 JA |
120 | */ |
121 | union { | |
122 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 123 | void *completion_data; |
e6a1c874 | 124 | }; |
9817064b | 125 | |
ff7d145f | 126 | /* |
7f1dc8a2 | 127 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
128 | * more they have to dynamically allocate it. Flush requests are |
129 | * never put on the IO scheduler. So let the flush fields share | |
a612fddf | 130 | * space with the elevator data. |
ff7d145f | 131 | */ |
c186794d | 132 | union { |
a612fddf TH |
133 | struct { |
134 | struct io_cq *icq; | |
135 | void *priv[2]; | |
136 | } elv; | |
137 | ||
c186794d MS |
138 | struct { |
139 | unsigned int seq; | |
140 | struct list_head list; | |
4853abaa | 141 | rq_end_io_fn *saved_end_io; |
c186794d MS |
142 | } flush; |
143 | }; | |
ff7d145f | 144 | |
8f34ee75 | 145 | struct gendisk *rq_disk; |
09e099d4 | 146 | struct hd_struct *part; |
1da177e4 | 147 | unsigned long start_time; |
9195291e | 148 | #ifdef CONFIG_BLK_CGROUP |
a051661c | 149 | struct request_list *rl; /* rl this rq is alloced from */ |
9195291e DS |
150 | unsigned long long start_time_ns; |
151 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
152 | #endif | |
1da177e4 LT |
153 | /* Number of scatter-gather DMA addr+len pairs after |
154 | * physical address coalescing is performed. | |
155 | */ | |
156 | unsigned short nr_phys_segments; | |
13f05c8d MP |
157 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
158 | unsigned short nr_integrity_segments; | |
159 | #endif | |
1da177e4 | 160 | |
8f34ee75 JA |
161 | unsigned short ioprio; |
162 | ||
731ec497 TH |
163 | void *special; /* opaque pointer available for LLD use */ |
164 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 165 | |
cdd60262 JA |
166 | int tag; |
167 | int errors; | |
168 | ||
1da177e4 LT |
169 | /* |
170 | * when request is used as a packet command carrier | |
171 | */ | |
d7e3c324 FT |
172 | unsigned char __cmd[BLK_MAX_CDB]; |
173 | unsigned char *cmd; | |
181fdde3 | 174 | unsigned short cmd_len; |
1da177e4 | 175 | |
7a85f889 | 176 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 177 | unsigned int sense_len; |
c3a4d78c | 178 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
179 | void *sense; |
180 | ||
242f9dcb JA |
181 | unsigned long deadline; |
182 | struct list_head timeout_list; | |
1da177e4 | 183 | unsigned int timeout; |
17e01f21 | 184 | int retries; |
1da177e4 | 185 | |
1da177e4 | 186 | /* |
c00895ab | 187 | * completion callback. |
1da177e4 LT |
188 | */ |
189 | rq_end_io_fn *end_io; | |
190 | void *end_io_data; | |
abae1fde FT |
191 | |
192 | /* for bidi */ | |
193 | struct request *next_rq; | |
1da177e4 LT |
194 | }; |
195 | ||
766ca442 FLVC |
196 | static inline unsigned short req_get_ioprio(struct request *req) |
197 | { | |
198 | return req->ioprio; | |
199 | } | |
200 | ||
1da177e4 | 201 | /* |
4aff5e23 | 202 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
203 | * requests. Some step values could eventually be made generic. |
204 | */ | |
205 | struct request_pm_state | |
206 | { | |
207 | /* PM state machine step value, currently driver specific */ | |
208 | int pm_step; | |
209 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
210 | u32 pm_state; | |
211 | void* data; /* for driver use */ | |
212 | }; | |
213 | ||
214 | #include <linux/elevator.h> | |
215 | ||
165125e1 | 216 | typedef void (request_fn_proc) (struct request_queue *q); |
5a7bbad2 | 217 | typedef void (make_request_fn) (struct request_queue *q, struct bio *bio); |
165125e1 | 218 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
28018c24 | 219 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
220 | |
221 | struct bio_vec; | |
cc371e66 AK |
222 | struct bvec_merge_data { |
223 | struct block_device *bi_bdev; | |
224 | sector_t bi_sector; | |
225 | unsigned bi_size; | |
226 | unsigned long bi_rw; | |
227 | }; | |
228 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
229 | struct bio_vec *); | |
ff856bad | 230 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 231 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 232 | typedef int (lld_busy_fn) (struct request_queue *q); |
aa387cc8 | 233 | typedef int (bsg_job_fn) (struct bsg_job *); |
1da177e4 | 234 | |
242f9dcb JA |
235 | enum blk_eh_timer_return { |
236 | BLK_EH_NOT_HANDLED, | |
237 | BLK_EH_HANDLED, | |
238 | BLK_EH_RESET_TIMER, | |
239 | }; | |
240 | ||
241 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
242 | ||
1da177e4 LT |
243 | enum blk_queue_state { |
244 | Queue_down, | |
245 | Queue_up, | |
246 | }; | |
247 | ||
1da177e4 LT |
248 | struct blk_queue_tag { |
249 | struct request **tag_index; /* map of busy tags */ | |
250 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
251 | int busy; /* current depth */ |
252 | int max_depth; /* what we will send to device */ | |
ba025082 | 253 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
254 | atomic_t refcnt; /* map can be shared */ |
255 | }; | |
256 | ||
abf54393 FT |
257 | #define BLK_SCSI_MAX_CMDS (256) |
258 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
259 | ||
025146e1 MP |
260 | struct queue_limits { |
261 | unsigned long bounce_pfn; | |
262 | unsigned long seg_boundary_mask; | |
263 | ||
264 | unsigned int max_hw_sectors; | |
265 | unsigned int max_sectors; | |
266 | unsigned int max_segment_size; | |
c72758f3 MP |
267 | unsigned int physical_block_size; |
268 | unsigned int alignment_offset; | |
269 | unsigned int io_min; | |
270 | unsigned int io_opt; | |
67efc925 | 271 | unsigned int max_discard_sectors; |
4363ac7c | 272 | unsigned int max_write_same_sectors; |
86b37281 MP |
273 | unsigned int discard_granularity; |
274 | unsigned int discard_alignment; | |
025146e1 MP |
275 | |
276 | unsigned short logical_block_size; | |
8a78362c | 277 | unsigned short max_segments; |
13f05c8d | 278 | unsigned short max_integrity_segments; |
025146e1 | 279 | |
c72758f3 | 280 | unsigned char misaligned; |
86b37281 | 281 | unsigned char discard_misaligned; |
e692cb66 | 282 | unsigned char cluster; |
a934a00a | 283 | unsigned char discard_zeroes_data; |
025146e1 MP |
284 | }; |
285 | ||
d7b76301 | 286 | struct request_queue { |
1da177e4 LT |
287 | /* |
288 | * Together with queue_head for cacheline sharing | |
289 | */ | |
290 | struct list_head queue_head; | |
291 | struct request *last_merge; | |
b374d18a | 292 | struct elevator_queue *elevator; |
8a5ecdd4 TH |
293 | int nr_rqs[2]; /* # allocated [a]sync rqs */ |
294 | int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ | |
1da177e4 LT |
295 | |
296 | /* | |
a051661c TH |
297 | * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
298 | * is used, root blkg allocates from @q->root_rl and all other | |
299 | * blkgs from their own blkg->rl. Which one to use should be | |
300 | * determined using bio_request_list(). | |
1da177e4 | 301 | */ |
a051661c | 302 | struct request_list root_rl; |
1da177e4 LT |
303 | |
304 | request_fn_proc *request_fn; | |
1da177e4 LT |
305 | make_request_fn *make_request_fn; |
306 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 307 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 308 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 309 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 310 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 311 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 312 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 313 | |
8922e16c TH |
314 | /* |
315 | * Dispatch queue sorting | |
316 | */ | |
1b47f531 | 317 | sector_t end_sector; |
8922e16c | 318 | struct request *boundary_rq; |
8922e16c | 319 | |
1da177e4 | 320 | /* |
3cca6dc1 | 321 | * Delayed queue handling |
1da177e4 | 322 | */ |
3cca6dc1 | 323 | struct delayed_work delay_work; |
1da177e4 LT |
324 | |
325 | struct backing_dev_info backing_dev_info; | |
326 | ||
327 | /* | |
328 | * The queue owner gets to use this for whatever they like. | |
329 | * ll_rw_blk doesn't touch it. | |
330 | */ | |
331 | void *queuedata; | |
332 | ||
1da177e4 | 333 | /* |
d7b76301 | 334 | * various queue flags, see QUEUE_* below |
1da177e4 | 335 | */ |
d7b76301 | 336 | unsigned long queue_flags; |
1da177e4 | 337 | |
a73f730d TH |
338 | /* |
339 | * ida allocated id for this queue. Used to index queues from | |
340 | * ioctx. | |
341 | */ | |
342 | int id; | |
343 | ||
1da177e4 | 344 | /* |
d7b76301 | 345 | * queue needs bounce pages for pages above this limit |
1da177e4 | 346 | */ |
d7b76301 | 347 | gfp_t bounce_gfp; |
1da177e4 LT |
348 | |
349 | /* | |
152587de JA |
350 | * protects queue structures from reentrancy. ->__queue_lock should |
351 | * _never_ be used directly, it is queue private. always use | |
352 | * ->queue_lock. | |
1da177e4 | 353 | */ |
152587de | 354 | spinlock_t __queue_lock; |
1da177e4 LT |
355 | spinlock_t *queue_lock; |
356 | ||
357 | /* | |
358 | * queue kobject | |
359 | */ | |
360 | struct kobject kobj; | |
361 | ||
6c954667 LM |
362 | #ifdef CONFIG_PM_RUNTIME |
363 | struct device *dev; | |
364 | int rpm_status; | |
365 | unsigned int nr_pending; | |
366 | #endif | |
367 | ||
1da177e4 LT |
368 | /* |
369 | * queue settings | |
370 | */ | |
371 | unsigned long nr_requests; /* Max # of requests */ | |
372 | unsigned int nr_congestion_on; | |
373 | unsigned int nr_congestion_off; | |
374 | unsigned int nr_batching; | |
375 | ||
fa0ccd83 | 376 | unsigned int dma_drain_size; |
d7b76301 | 377 | void *dma_drain_buffer; |
e3790c7d | 378 | unsigned int dma_pad_mask; |
1da177e4 LT |
379 | unsigned int dma_alignment; |
380 | ||
381 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 382 | struct list_head tag_busy_list; |
1da177e4 | 383 | |
15853af9 | 384 | unsigned int nr_sorted; |
0a7ae2ff | 385 | unsigned int in_flight[2]; |
24faf6f6 BVA |
386 | /* |
387 | * Number of active block driver functions for which blk_drain_queue() | |
388 | * must wait. Must be incremented around functions that unlock the | |
389 | * queue_lock internally, e.g. scsi_request_fn(). | |
390 | */ | |
391 | unsigned int request_fn_active; | |
1da177e4 | 392 | |
242f9dcb JA |
393 | unsigned int rq_timeout; |
394 | struct timer_list timeout; | |
395 | struct list_head timeout_list; | |
396 | ||
a612fddf | 397 | struct list_head icq_list; |
4eef3049 | 398 | #ifdef CONFIG_BLK_CGROUP |
a2b1693b | 399 | DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
3c798398 | 400 | struct blkcg_gq *root_blkg; |
03aa264a | 401 | struct list_head blkg_list; |
4eef3049 | 402 | #endif |
a612fddf | 403 | |
025146e1 MP |
404 | struct queue_limits limits; |
405 | ||
1da177e4 LT |
406 | /* |
407 | * sg stuff | |
408 | */ | |
409 | unsigned int sg_timeout; | |
410 | unsigned int sg_reserved_size; | |
1946089a | 411 | int node; |
6c5c9341 | 412 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 413 | struct blk_trace *blk_trace; |
6c5c9341 | 414 | #endif |
1da177e4 | 415 | /* |
4913efe4 | 416 | * for flush operations |
1da177e4 | 417 | */ |
4913efe4 | 418 | unsigned int flush_flags; |
f3876930 | 419 | unsigned int flush_not_queueable:1; |
3ac0cc45 | 420 | unsigned int flush_queue_delayed:1; |
ae1b1539 TH |
421 | unsigned int flush_pending_idx:1; |
422 | unsigned int flush_running_idx:1; | |
423 | unsigned long flush_pending_since; | |
424 | struct list_head flush_queue[2]; | |
425 | struct list_head flush_data_in_flight; | |
dd4c133f | 426 | struct request flush_rq; |
483f4afc AV |
427 | |
428 | struct mutex sysfs_lock; | |
d351af01 | 429 | |
d732580b TH |
430 | int bypass_depth; |
431 | ||
d351af01 | 432 | #if defined(CONFIG_BLK_DEV_BSG) |
aa387cc8 MC |
433 | bsg_job_fn *bsg_job_fn; |
434 | int bsg_job_size; | |
d351af01 FT |
435 | struct bsg_class_device bsg_dev; |
436 | #endif | |
e43473b7 | 437 | |
923adde1 TH |
438 | #ifdef CONFIG_BLK_CGROUP |
439 | struct list_head all_q_node; | |
440 | #endif | |
e43473b7 VG |
441 | #ifdef CONFIG_BLK_DEV_THROTTLING |
442 | /* Throttle data */ | |
443 | struct throtl_data *td; | |
444 | #endif | |
548bc8e1 | 445 | struct rcu_head rcu_head; |
1da177e4 LT |
446 | }; |
447 | ||
1da177e4 LT |
448 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
449 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
450 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
451 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
3f3299d5 | 452 | #define QUEUE_FLAG_DYING 5 /* queue being torn down */ |
d732580b | 453 | #define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */ |
c21e6beb JA |
454 | #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
455 | #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ | |
5757a6d7 | 456 | #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ |
c21e6beb JA |
457 | #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ |
458 | #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ | |
459 | #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ | |
88e740f1 | 460 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
c21e6beb JA |
461 | #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ |
462 | #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ | |
463 | #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ | |
464 | #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ | |
465 | #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ | |
5757a6d7 | 466 | #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ |
c246e80d | 467 | #define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */ |
bc58ba94 JA |
468 | |
469 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 470 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
471 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
472 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 473 | |
8bcb6c7d | 474 | static inline void queue_lockdep_assert_held(struct request_queue *q) |
8f45c1a5 | 475 | { |
8bcb6c7d AK |
476 | if (q->queue_lock) |
477 | lockdep_assert_held(q->queue_lock); | |
8f45c1a5 LT |
478 | } |
479 | ||
75ad23bc NP |
480 | static inline void queue_flag_set_unlocked(unsigned int flag, |
481 | struct request_queue *q) | |
482 | { | |
483 | __set_bit(flag, &q->queue_flags); | |
484 | } | |
485 | ||
e48ec690 JA |
486 | static inline int queue_flag_test_and_clear(unsigned int flag, |
487 | struct request_queue *q) | |
488 | { | |
8bcb6c7d | 489 | queue_lockdep_assert_held(q); |
e48ec690 JA |
490 | |
491 | if (test_bit(flag, &q->queue_flags)) { | |
492 | __clear_bit(flag, &q->queue_flags); | |
493 | return 1; | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | static inline int queue_flag_test_and_set(unsigned int flag, | |
500 | struct request_queue *q) | |
501 | { | |
8bcb6c7d | 502 | queue_lockdep_assert_held(q); |
e48ec690 JA |
503 | |
504 | if (!test_bit(flag, &q->queue_flags)) { | |
505 | __set_bit(flag, &q->queue_flags); | |
506 | return 0; | |
507 | } | |
508 | ||
509 | return 1; | |
510 | } | |
511 | ||
75ad23bc NP |
512 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
513 | { | |
8bcb6c7d | 514 | queue_lockdep_assert_held(q); |
75ad23bc NP |
515 | __set_bit(flag, &q->queue_flags); |
516 | } | |
517 | ||
518 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
519 | struct request_queue *q) | |
520 | { | |
521 | __clear_bit(flag, &q->queue_flags); | |
522 | } | |
523 | ||
0a7ae2ff JA |
524 | static inline int queue_in_flight(struct request_queue *q) |
525 | { | |
526 | return q->in_flight[0] + q->in_flight[1]; | |
527 | } | |
528 | ||
75ad23bc NP |
529 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
530 | { | |
8bcb6c7d | 531 | queue_lockdep_assert_held(q); |
75ad23bc NP |
532 | __clear_bit(flag, &q->queue_flags); |
533 | } | |
534 | ||
1da177e4 LT |
535 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
536 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
3f3299d5 | 537 | #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) |
c246e80d | 538 | #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) |
d732580b | 539 | #define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags) |
ac9fafa1 | 540 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
541 | #define blk_queue_noxmerges(q) \ |
542 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 543 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 544 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 545 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
546 | #define blk_queue_stackable(q) \ |
547 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 548 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
549 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
550 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 551 | |
33659ebb CH |
552 | #define blk_noretry_request(rq) \ |
553 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
554 | REQ_FAILFAST_DRIVER)) | |
555 | ||
556 | #define blk_account_rq(rq) \ | |
557 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
e2a60da7 | 558 | ((rq)->cmd_type == REQ_TYPE_FS)) |
33659ebb | 559 | |
1da177e4 | 560 | #define blk_pm_request(rq) \ |
33659ebb CH |
561 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
562 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 563 | |
ab780f1e | 564 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 565 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
566 | /* rq->queuelist of dequeued request must be list_empty() */ |
567 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
568 | |
569 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
570 | ||
5953316d | 571 | #define rq_data_dir(rq) (((rq)->cmd_flags & 1) != 0) |
1da177e4 | 572 | |
e692cb66 MP |
573 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
574 | { | |
575 | return q->limits.cluster; | |
576 | } | |
577 | ||
9e2585a8 | 578 | /* |
1faa16d2 | 579 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 580 | */ |
1faa16d2 JA |
581 | static inline bool rw_is_sync(unsigned int rw_flags) |
582 | { | |
7b6d91da | 583 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
584 | } |
585 | ||
586 | static inline bool rq_is_sync(struct request *rq) | |
587 | { | |
588 | return rw_is_sync(rq->cmd_flags); | |
589 | } | |
590 | ||
5b788ce3 | 591 | static inline bool blk_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 592 | { |
5b788ce3 TH |
593 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
594 | ||
595 | return rl->flags & flag; | |
1da177e4 LT |
596 | } |
597 | ||
5b788ce3 | 598 | static inline void blk_set_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 599 | { |
5b788ce3 TH |
600 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
601 | ||
602 | rl->flags |= flag; | |
1da177e4 LT |
603 | } |
604 | ||
5b788ce3 | 605 | static inline void blk_clear_rl_full(struct request_list *rl, bool sync) |
1da177e4 | 606 | { |
5b788ce3 TH |
607 | unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL; |
608 | ||
609 | rl->flags &= ~flag; | |
1da177e4 LT |
610 | } |
611 | ||
e2a60da7 MP |
612 | static inline bool rq_mergeable(struct request *rq) |
613 | { | |
614 | if (rq->cmd_type != REQ_TYPE_FS) | |
615 | return false; | |
1da177e4 | 616 | |
e2a60da7 MP |
617 | if (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
618 | return false; | |
619 | ||
620 | return true; | |
621 | } | |
1da177e4 | 622 | |
f31dc1cd MP |
623 | static inline bool blk_check_merge_flags(unsigned int flags1, |
624 | unsigned int flags2) | |
625 | { | |
626 | if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) | |
627 | return false; | |
628 | ||
629 | if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) | |
630 | return false; | |
631 | ||
4363ac7c MP |
632 | if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
633 | return false; | |
634 | ||
f31dc1cd MP |
635 | return true; |
636 | } | |
637 | ||
4363ac7c MP |
638 | static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) |
639 | { | |
640 | if (bio_data(a) == bio_data(b)) | |
641 | return true; | |
642 | ||
643 | return false; | |
644 | } | |
645 | ||
1da177e4 LT |
646 | /* |
647 | * q->prep_rq_fn return values | |
648 | */ | |
649 | #define BLKPREP_OK 0 /* serve it */ | |
650 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
651 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
652 | ||
653 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
654 | ||
655 | /* | |
656 | * standard bounce addresses: | |
657 | * | |
658 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
659 | * BLK_BOUNCE_ANY : don't bounce anything | |
660 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
661 | */ | |
2472892a AK |
662 | |
663 | #if BITS_PER_LONG == 32 | |
1da177e4 | 664 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
665 | #else |
666 | #define BLK_BOUNCE_HIGH -1ULL | |
667 | #endif | |
668 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 669 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 670 | |
3d6392cf JA |
671 | /* |
672 | * default timeout for SG_IO if none specified | |
673 | */ | |
674 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 675 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 676 | |
2a7326b5 | 677 | #ifdef CONFIG_BOUNCE |
1da177e4 | 678 | extern int init_emergency_isa_pool(void); |
165125e1 | 679 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
680 | #else |
681 | static inline int init_emergency_isa_pool(void) | |
682 | { | |
683 | return 0; | |
684 | } | |
165125e1 | 685 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
686 | { |
687 | } | |
688 | #endif /* CONFIG_MMU */ | |
689 | ||
152e283f FT |
690 | struct rq_map_data { |
691 | struct page **pages; | |
692 | int page_order; | |
693 | int nr_entries; | |
56c451f4 | 694 | unsigned long offset; |
97ae77a1 | 695 | int null_mapped; |
ecb554a8 | 696 | int from_user; |
152e283f FT |
697 | }; |
698 | ||
5705f702 N |
699 | struct req_iterator { |
700 | int i; | |
701 | struct bio *bio; | |
702 | }; | |
703 | ||
704 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
705 | #define for_each_bio(_bio) \ |
706 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 707 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
708 | if ((rq->bio)) \ |
709 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
710 | ||
5705f702 N |
711 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
712 | __rq_for_each_bio(_iter.bio, _rq) \ | |
713 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
714 | ||
715 | #define rq_iter_last(rq, _iter) \ | |
716 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
717 | ||
2d4dc890 IL |
718 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
719 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
720 | #endif | |
721 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
722 | extern void rq_flush_dcache_pages(struct request *rq); | |
723 | #else | |
724 | static inline void rq_flush_dcache_pages(struct request *rq) | |
725 | { | |
726 | } | |
727 | #endif | |
728 | ||
1da177e4 LT |
729 | extern int blk_register_queue(struct gendisk *disk); |
730 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 731 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 732 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 733 | extern void blk_put_request(struct request *); |
165125e1 | 734 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 735 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
736 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
737 | gfp_t); | |
165125e1 | 738 | extern void blk_requeue_request(struct request_queue *, struct request *); |
66ac0280 CH |
739 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
740 | unsigned int len); | |
82124d60 | 741 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 742 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
743 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
744 | struct bio_set *bs, gfp_t gfp_mask, | |
745 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
746 | void *data); | |
747 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
748 | extern int blk_insert_cloned_request(struct request_queue *q, |
749 | struct request *rq); | |
3cca6dc1 | 750 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 751 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
0bfc96cb | 752 | extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); |
577ebb37 PB |
753 | extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, |
754 | unsigned int, void __user *); | |
74f3c8af AV |
755 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
756 | unsigned int, void __user *); | |
e915e872 AV |
757 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
758 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 759 | |
5a7bbad2 | 760 | extern void blk_queue_bio(struct request_queue *q, struct bio *bio); |
166e1f90 | 761 | |
3fcfab16 AM |
762 | /* |
763 | * A queue has just exitted congestion. Note this in the global counter of | |
764 | * congested queues, and wake up anyone who was waiting for requests to be | |
765 | * put back. | |
766 | */ | |
8aa7e847 | 767 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 768 | { |
8aa7e847 | 769 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
770 | } |
771 | ||
772 | /* | |
773 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
774 | * state flags and increment the global gounter of congested queues. | |
775 | */ | |
8aa7e847 | 776 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 777 | { |
8aa7e847 | 778 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
779 | } |
780 | ||
165125e1 JA |
781 | extern void blk_start_queue(struct request_queue *q); |
782 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 783 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 784 | extern void __blk_stop_queue(struct request_queue *q); |
24ecfbe2 | 785 | extern void __blk_run_queue(struct request_queue *q); |
165125e1 | 786 | extern void blk_run_queue(struct request_queue *); |
c21e6beb | 787 | extern void blk_run_queue_async(struct request_queue *q); |
a3bce90e | 788 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
789 | struct rq_map_data *, void __user *, unsigned long, |
790 | gfp_t); | |
8e5cfc45 | 791 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
792 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
793 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
794 | struct rq_map_data *, struct sg_iovec *, int, |
795 | unsigned int, gfp_t); | |
165125e1 | 796 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 797 | struct request *, int); |
165125e1 | 798 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 799 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 800 | |
165125e1 | 801 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
802 | { |
803 | return bdev->bd_disk->queue; | |
804 | } | |
805 | ||
5efccd17 | 806 | /* |
80a761fd TH |
807 | * blk_rq_pos() : the current sector |
808 | * blk_rq_bytes() : bytes left in the entire request | |
809 | * blk_rq_cur_bytes() : bytes left in the current segment | |
810 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
811 | * blk_rq_sectors() : sectors left in the entire request | |
812 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 813 | */ |
5b93629b TH |
814 | static inline sector_t blk_rq_pos(const struct request *rq) |
815 | { | |
a2dec7b3 | 816 | return rq->__sector; |
2e46e8b2 TH |
817 | } |
818 | ||
819 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
820 | { | |
a2dec7b3 | 821 | return rq->__data_len; |
5b93629b TH |
822 | } |
823 | ||
2e46e8b2 TH |
824 | static inline int blk_rq_cur_bytes(const struct request *rq) |
825 | { | |
826 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
827 | } | |
5efccd17 | 828 | |
80a761fd TH |
829 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
830 | ||
5b93629b TH |
831 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
832 | { | |
2e46e8b2 | 833 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
834 | } |
835 | ||
836 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
837 | { | |
2e46e8b2 | 838 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
839 | } |
840 | ||
f31dc1cd MP |
841 | static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, |
842 | unsigned int cmd_flags) | |
843 | { | |
844 | if (unlikely(cmd_flags & REQ_DISCARD)) | |
871dd928 | 845 | return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
f31dc1cd | 846 | |
4363ac7c MP |
847 | if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
848 | return q->limits.max_write_same_sectors; | |
849 | ||
f31dc1cd MP |
850 | return q->limits.max_sectors; |
851 | } | |
852 | ||
853 | static inline unsigned int blk_rq_get_max_sectors(struct request *rq) | |
854 | { | |
855 | struct request_queue *q = rq->q; | |
856 | ||
857 | if (unlikely(rq->cmd_type == REQ_TYPE_BLOCK_PC)) | |
858 | return q->limits.max_hw_sectors; | |
859 | ||
860 | return blk_queue_get_max_sectors(q, rq->cmd_flags); | |
861 | } | |
862 | ||
75afb352 JN |
863 | static inline unsigned int blk_rq_count_bios(struct request *rq) |
864 | { | |
865 | unsigned int nr_bios = 0; | |
866 | struct bio *bio; | |
867 | ||
868 | __rq_for_each_bio(bio, rq) | |
869 | nr_bios++; | |
870 | ||
871 | return nr_bios; | |
872 | } | |
873 | ||
9934c8c0 TH |
874 | /* |
875 | * Request issue related functions. | |
876 | */ | |
877 | extern struct request *blk_peek_request(struct request_queue *q); | |
878 | extern void blk_start_request(struct request *rq); | |
879 | extern struct request *blk_fetch_request(struct request_queue *q); | |
880 | ||
1da177e4 | 881 | /* |
2e60e022 TH |
882 | * Request completion related functions. |
883 | * | |
884 | * blk_update_request() completes given number of bytes and updates | |
885 | * the request without completing it. | |
886 | * | |
f06d9a2b TH |
887 | * blk_end_request() and friends. __blk_end_request() must be called |
888 | * with the request queue spinlock acquired. | |
1da177e4 LT |
889 | * |
890 | * Several drivers define their own end_request and call | |
3bcddeac KU |
891 | * blk_end_request() for parts of the original function. |
892 | * This prevents code duplication in drivers. | |
1da177e4 | 893 | */ |
2e60e022 TH |
894 | extern bool blk_update_request(struct request *rq, int error, |
895 | unsigned int nr_bytes); | |
b1f74493 FT |
896 | extern bool blk_end_request(struct request *rq, int error, |
897 | unsigned int nr_bytes); | |
898 | extern void blk_end_request_all(struct request *rq, int error); | |
899 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 900 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
901 | extern bool __blk_end_request(struct request *rq, int error, |
902 | unsigned int nr_bytes); | |
903 | extern void __blk_end_request_all(struct request *rq, int error); | |
904 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 905 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 906 | |
ff856bad | 907 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
908 | extern void __blk_complete_request(struct request *); |
909 | extern void blk_abort_request(struct request *); | |
28018c24 | 910 | extern void blk_unprep_request(struct request *); |
ff856bad | 911 | |
1da177e4 LT |
912 | /* |
913 | * Access functions for manipulating queue properties | |
914 | */ | |
165125e1 | 915 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 916 | spinlock_t *lock, int node_id); |
165125e1 | 917 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
918 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
919 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
920 | extern void blk_cleanup_queue(struct request_queue *); |
921 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
922 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 923 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 924 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 925 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 926 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
927 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
928 | unsigned int max_discard_sectors); | |
4363ac7c MP |
929 | extern void blk_queue_max_write_same_sectors(struct request_queue *q, |
930 | unsigned int max_write_same_sectors); | |
e1defc4f | 931 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 932 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
933 | extern void blk_queue_alignment_offset(struct request_queue *q, |
934 | unsigned int alignment); | |
7c958e32 | 935 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 936 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 937 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 938 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 939 | extern void blk_set_default_limits(struct queue_limits *lim); |
b1bd055d | 940 | extern void blk_set_stacking_limits(struct queue_limits *lim); |
c72758f3 MP |
941 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
942 | sector_t offset); | |
17be8c24 MP |
943 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
944 | sector_t offset); | |
c72758f3 MP |
945 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
946 | sector_t offset); | |
165125e1 | 947 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 948 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 949 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
950 | extern int blk_queue_dma_drain(struct request_queue *q, |
951 | dma_drain_needed_fn *dma_drain_needed, | |
952 | void *buf, unsigned int size); | |
ef9e3fac | 953 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
954 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
955 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 956 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
957 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
958 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 959 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 960 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
961 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
962 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 963 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
f3876930 | 964 | extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
1da177e4 | 965 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 966 | |
165125e1 | 967 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
85b9f66a AH |
968 | extern int blk_bio_map_sg(struct request_queue *q, struct bio *bio, |
969 | struct scatterlist *sglist); | |
1da177e4 | 970 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 971 | extern long nr_blockdev_pages(void); |
1da177e4 | 972 | |
09ac46c4 | 973 | bool __must_check blk_get_queue(struct request_queue *); |
165125e1 JA |
974 | struct request_queue *blk_alloc_queue(gfp_t); |
975 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
976 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 977 | |
6c954667 LM |
978 | /* |
979 | * block layer runtime pm functions | |
980 | */ | |
981 | #ifdef CONFIG_PM_RUNTIME | |
982 | extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev); | |
983 | extern int blk_pre_runtime_suspend(struct request_queue *q); | |
984 | extern void blk_post_runtime_suspend(struct request_queue *q, int err); | |
985 | extern void blk_pre_runtime_resume(struct request_queue *q); | |
986 | extern void blk_post_runtime_resume(struct request_queue *q, int err); | |
987 | #else | |
988 | static inline void blk_pm_runtime_init(struct request_queue *q, | |
989 | struct device *dev) {} | |
990 | static inline int blk_pre_runtime_suspend(struct request_queue *q) | |
991 | { | |
992 | return -ENOSYS; | |
993 | } | |
994 | static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {} | |
995 | static inline void blk_pre_runtime_resume(struct request_queue *q) {} | |
996 | static inline void blk_post_runtime_resume(struct request_queue *q, int err) {} | |
997 | #endif | |
998 | ||
316cc67d | 999 | /* |
75df7136 SJ |
1000 | * blk_plug permits building a queue of related requests by holding the I/O |
1001 | * fragments for a short period. This allows merging of sequential requests | |
1002 | * into single larger request. As the requests are moved from a per-task list to | |
1003 | * the device's request_queue in a batch, this results in improved scalability | |
1004 | * as the lock contention for request_queue lock is reduced. | |
1005 | * | |
1006 | * It is ok not to disable preemption when adding the request to the plug list | |
1007 | * or when attempting a merge, because blk_schedule_flush_list() will only flush | |
1008 | * the plug list when the task sleeps by itself. For details, please see | |
1009 | * schedule() where blk_schedule_flush_plug() is called. | |
316cc67d | 1010 | */ |
73c10101 | 1011 | struct blk_plug { |
75df7136 SJ |
1012 | unsigned long magic; /* detect uninitialized use-cases */ |
1013 | struct list_head list; /* requests */ | |
1014 | struct list_head cb_list; /* md requires an unplug callback */ | |
73c10101 | 1015 | }; |
55c022bb SL |
1016 | #define BLK_MAX_REQUEST_COUNT 16 |
1017 | ||
9cbb1750 | 1018 | struct blk_plug_cb; |
74018dc3 | 1019 | typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); |
048c9374 N |
1020 | struct blk_plug_cb { |
1021 | struct list_head list; | |
9cbb1750 N |
1022 | blk_plug_cb_fn callback; |
1023 | void *data; | |
048c9374 | 1024 | }; |
9cbb1750 N |
1025 | extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, |
1026 | void *data, int size); | |
73c10101 JA |
1027 | extern void blk_start_plug(struct blk_plug *); |
1028 | extern void blk_finish_plug(struct blk_plug *); | |
f6603783 | 1029 | extern void blk_flush_plug_list(struct blk_plug *, bool); |
73c10101 JA |
1030 | |
1031 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1032 | { | |
1033 | struct blk_plug *plug = tsk->plug; | |
1034 | ||
a237c1c5 JA |
1035 | if (plug) |
1036 | blk_flush_plug_list(plug, false); | |
1037 | } | |
1038 | ||
1039 | static inline void blk_schedule_flush_plug(struct task_struct *tsk) | |
1040 | { | |
1041 | struct blk_plug *plug = tsk->plug; | |
1042 | ||
88b996cd | 1043 | if (plug) |
f6603783 | 1044 | blk_flush_plug_list(plug, true); |
73c10101 JA |
1045 | } |
1046 | ||
1047 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1048 | { | |
1049 | struct blk_plug *plug = tsk->plug; | |
1050 | ||
048c9374 | 1051 | return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); |
73c10101 JA |
1052 | } |
1053 | ||
1da177e4 LT |
1054 | /* |
1055 | * tag stuff | |
1056 | */ | |
4aff5e23 | 1057 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
1058 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1059 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1060 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1061 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1062 | extern void blk_queue_free_tags(struct request_queue *); | |
1063 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1064 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1065 | extern struct blk_queue_tag *blk_init_tags(int); |
1066 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1067 | |
f583f492 DS |
1068 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1069 | int tag) | |
1070 | { | |
1071 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1072 | return NULL; | |
1073 | return bqt->tag_index[tag]; | |
1074 | } | |
dd3932ed CH |
1075 | |
1076 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
1077 | ||
1078 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
1079 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
1080 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
4363ac7c MP |
1081 | extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, |
1082 | sector_t nr_sects, gfp_t gfp_mask, struct page *page); | |
3f14d792 | 1083 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 1084 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
1085 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
1086 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 1087 | { |
2cf6d26a CH |
1088 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
1089 | nr_blocks << (sb->s_blocksize_bits - 9), | |
1090 | gfp_mask, flags); | |
fb2dce86 | 1091 | } |
e6fa0be6 | 1092 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 1093 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
1094 | { |
1095 | return blkdev_issue_zeroout(sb->s_bdev, | |
1096 | block << (sb->s_blocksize_bits - 9), | |
1097 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 1098 | gfp_mask); |
e6fa0be6 | 1099 | } |
1da177e4 | 1100 | |
018e0446 | 1101 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1102 | |
eb28d31b MP |
1103 | enum blk_default_limits { |
1104 | BLK_MAX_SEGMENTS = 128, | |
1105 | BLK_SAFE_MAX_SECTORS = 255, | |
1106 | BLK_DEF_MAX_SECTORS = 1024, | |
1107 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1108 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1109 | }; | |
0e435ac2 | 1110 | |
1da177e4 LT |
1111 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1112 | ||
ae03bf63 MP |
1113 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1114 | { | |
025146e1 | 1115 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1116 | } |
1117 | ||
1118 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1119 | { | |
025146e1 | 1120 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1121 | } |
1122 | ||
1123 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1124 | { | |
025146e1 | 1125 | return q->limits.max_sectors; |
ae03bf63 MP |
1126 | } |
1127 | ||
1128 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1129 | { | |
025146e1 | 1130 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1131 | } |
1132 | ||
8a78362c | 1133 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1134 | { |
8a78362c | 1135 | return q->limits.max_segments; |
ae03bf63 MP |
1136 | } |
1137 | ||
1138 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1139 | { | |
025146e1 | 1140 | return q->limits.max_segment_size; |
ae03bf63 MP |
1141 | } |
1142 | ||
e1defc4f | 1143 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1144 | { |
1145 | int retval = 512; | |
1146 | ||
025146e1 MP |
1147 | if (q && q->limits.logical_block_size) |
1148 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1149 | |
1150 | return retval; | |
1151 | } | |
1152 | ||
e1defc4f | 1153 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1154 | { |
e1defc4f | 1155 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1156 | } |
1157 | ||
c72758f3 MP |
1158 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1159 | { | |
1160 | return q->limits.physical_block_size; | |
1161 | } | |
1162 | ||
892b6f90 | 1163 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
1164 | { |
1165 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1166 | } | |
1167 | ||
c72758f3 MP |
1168 | static inline unsigned int queue_io_min(struct request_queue *q) |
1169 | { | |
1170 | return q->limits.io_min; | |
1171 | } | |
1172 | ||
ac481c20 MP |
1173 | static inline int bdev_io_min(struct block_device *bdev) |
1174 | { | |
1175 | return queue_io_min(bdev_get_queue(bdev)); | |
1176 | } | |
1177 | ||
c72758f3 MP |
1178 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1179 | { | |
1180 | return q->limits.io_opt; | |
1181 | } | |
1182 | ||
ac481c20 MP |
1183 | static inline int bdev_io_opt(struct block_device *bdev) |
1184 | { | |
1185 | return queue_io_opt(bdev_get_queue(bdev)); | |
1186 | } | |
1187 | ||
c72758f3 MP |
1188 | static inline int queue_alignment_offset(struct request_queue *q) |
1189 | { | |
ac481c20 | 1190 | if (q->limits.misaligned) |
c72758f3 MP |
1191 | return -1; |
1192 | ||
ac481c20 | 1193 | return q->limits.alignment_offset; |
c72758f3 MP |
1194 | } |
1195 | ||
e03a72e1 | 1196 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1197 | { |
1198 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1199 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1200 | |
e03a72e1 MP |
1201 | return (granularity + lim->alignment_offset - alignment) |
1202 | & (granularity - 1); | |
c72758f3 MP |
1203 | } |
1204 | ||
ac481c20 MP |
1205 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1206 | { | |
1207 | struct request_queue *q = bdev_get_queue(bdev); | |
1208 | ||
1209 | if (q->limits.misaligned) | |
1210 | return -1; | |
1211 | ||
1212 | if (bdev != bdev->bd_contains) | |
1213 | return bdev->bd_part->alignment_offset; | |
1214 | ||
1215 | return q->limits.alignment_offset; | |
1216 | } | |
1217 | ||
86b37281 MP |
1218 | static inline int queue_discard_alignment(struct request_queue *q) |
1219 | { | |
1220 | if (q->limits.discard_misaligned) | |
1221 | return -1; | |
1222 | ||
1223 | return q->limits.discard_alignment; | |
1224 | } | |
1225 | ||
e03a72e1 | 1226 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1227 | { |
59771079 | 1228 | unsigned int alignment, granularity, offset; |
dd3d145d | 1229 | |
a934a00a MP |
1230 | if (!lim->max_discard_sectors) |
1231 | return 0; | |
1232 | ||
59771079 LT |
1233 | /* Why are these in bytes, not sectors? */ |
1234 | alignment = lim->discard_alignment >> 9; | |
1235 | granularity = lim->discard_granularity >> 9; | |
1236 | if (!granularity) | |
1237 | return 0; | |
1238 | ||
1239 | /* Offset of the partition start in 'granularity' sectors */ | |
1240 | offset = sector_div(sector, granularity); | |
1241 | ||
1242 | /* And why do we do this modulus *again* in blkdev_issue_discard()? */ | |
1243 | offset = (granularity + alignment - offset) % granularity; | |
1244 | ||
1245 | /* Turn it back into bytes, gaah */ | |
1246 | return offset << 9; | |
86b37281 MP |
1247 | } |
1248 | ||
c6e66634 PB |
1249 | static inline int bdev_discard_alignment(struct block_device *bdev) |
1250 | { | |
1251 | struct request_queue *q = bdev_get_queue(bdev); | |
1252 | ||
1253 | if (bdev != bdev->bd_contains) | |
1254 | return bdev->bd_part->discard_alignment; | |
1255 | ||
1256 | return q->limits.discard_alignment; | |
1257 | } | |
1258 | ||
98262f27 MP |
1259 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1260 | { | |
a934a00a | 1261 | if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) |
98262f27 MP |
1262 | return 1; |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
1267 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1268 | { | |
1269 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1270 | } | |
1271 | ||
4363ac7c MP |
1272 | static inline unsigned int bdev_write_same(struct block_device *bdev) |
1273 | { | |
1274 | struct request_queue *q = bdev_get_queue(bdev); | |
1275 | ||
1276 | if (q) | |
1277 | return q->limits.max_write_same_sectors; | |
1278 | ||
1279 | return 0; | |
1280 | } | |
1281 | ||
165125e1 | 1282 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1283 | { |
482eb689 | 1284 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1285 | } |
1286 | ||
14417799 | 1287 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1288 | unsigned int len) |
1289 | { | |
1290 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1291 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1292 | } |
1293 | ||
1da177e4 LT |
1294 | /* assumes size > 256 */ |
1295 | static inline unsigned int blksize_bits(unsigned int size) | |
1296 | { | |
1297 | unsigned int bits = 8; | |
1298 | do { | |
1299 | bits++; | |
1300 | size >>= 1; | |
1301 | } while (size > 256); | |
1302 | return bits; | |
1303 | } | |
1304 | ||
2befb9e3 | 1305 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1306 | { |
1307 | return bdev->bd_block_size; | |
1308 | } | |
1309 | ||
f3876930 | 1310 | static inline bool queue_flush_queueable(struct request_queue *q) |
1311 | { | |
1312 | return !q->flush_not_queueable; | |
1313 | } | |
1314 | ||
1da177e4 LT |
1315 | typedef struct {struct page *v;} Sector; |
1316 | ||
1317 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1318 | ||
1319 | static inline void put_dev_sector(Sector p) | |
1320 | { | |
1321 | page_cache_release(p.v); | |
1322 | } | |
1323 | ||
1324 | struct work_struct; | |
18887ad9 | 1325 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1326 | |
9195291e | 1327 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1328 | /* |
1329 | * This should not be using sched_clock(). A real patch is in progress | |
1330 | * to fix this up, until that is in place we need to disable preemption | |
1331 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1332 | */ | |
9195291e DS |
1333 | static inline void set_start_time_ns(struct request *req) |
1334 | { | |
28f4197e | 1335 | preempt_disable(); |
9195291e | 1336 | req->start_time_ns = sched_clock(); |
28f4197e | 1337 | preempt_enable(); |
9195291e DS |
1338 | } |
1339 | ||
1340 | static inline void set_io_start_time_ns(struct request *req) | |
1341 | { | |
28f4197e | 1342 | preempt_disable(); |
9195291e | 1343 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1344 | preempt_enable(); |
9195291e | 1345 | } |
84c124da DS |
1346 | |
1347 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1348 | { | |
1349 | return req->start_time_ns; | |
1350 | } | |
1351 | ||
1352 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1353 | { | |
1354 | return req->io_start_time_ns; | |
1355 | } | |
9195291e DS |
1356 | #else |
1357 | static inline void set_start_time_ns(struct request *req) {} | |
1358 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1359 | static inline uint64_t rq_start_time_ns(struct request *req) |
1360 | { | |
1361 | return 0; | |
1362 | } | |
1363 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1364 | { | |
1365 | return 0; | |
1366 | } | |
9195291e DS |
1367 | #endif |
1368 | ||
1da177e4 LT |
1369 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1370 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1371 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1372 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1373 | ||
7ba1ba12 MP |
1374 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1375 | ||
b24498d4 JA |
1376 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1377 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1378 | |
1379 | struct blk_integrity_exchg { | |
1380 | void *prot_buf; | |
1381 | void *data_buf; | |
1382 | sector_t sector; | |
1383 | unsigned int data_size; | |
1384 | unsigned short sector_size; | |
1385 | const char *disk_name; | |
1386 | }; | |
1387 | ||
1388 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1389 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1390 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1391 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1392 | ||
1393 | struct blk_integrity { | |
1394 | integrity_gen_fn *generate_fn; | |
1395 | integrity_vrfy_fn *verify_fn; | |
1396 | integrity_set_tag_fn *set_tag_fn; | |
1397 | integrity_get_tag_fn *get_tag_fn; | |
1398 | ||
1399 | unsigned short flags; | |
1400 | unsigned short tuple_size; | |
1401 | unsigned short sector_size; | |
1402 | unsigned short tag_size; | |
1403 | ||
1404 | const char *name; | |
1405 | ||
1406 | struct kobject kobj; | |
1407 | }; | |
1408 | ||
a63a5cf8 | 1409 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1410 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1411 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1412 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1413 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1414 | struct scatterlist *); | |
1415 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1416 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1417 | struct request *); | |
1418 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1419 | struct bio *); | |
7ba1ba12 | 1420 | |
b04accc4 JA |
1421 | static inline |
1422 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1423 | { | |
1424 | return bdev->bd_disk->integrity; | |
1425 | } | |
1426 | ||
b02739b0 MP |
1427 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1428 | { | |
1429 | return disk->integrity; | |
1430 | } | |
1431 | ||
7ba1ba12 MP |
1432 | static inline int blk_integrity_rq(struct request *rq) |
1433 | { | |
d442cc44 MP |
1434 | if (rq->bio == NULL) |
1435 | return 0; | |
1436 | ||
7ba1ba12 MP |
1437 | return bio_integrity(rq->bio); |
1438 | } | |
1439 | ||
13f05c8d MP |
1440 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1441 | unsigned int segs) | |
1442 | { | |
1443 | q->limits.max_integrity_segments = segs; | |
1444 | } | |
1445 | ||
1446 | static inline unsigned short | |
1447 | queue_max_integrity_segments(struct request_queue *q) | |
1448 | { | |
1449 | return q->limits.max_integrity_segments; | |
1450 | } | |
1451 | ||
7ba1ba12 MP |
1452 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1453 | ||
fd83240a SR |
1454 | struct bio; |
1455 | struct block_device; | |
1456 | struct gendisk; | |
1457 | struct blk_integrity; | |
1458 | ||
1459 | static inline int blk_integrity_rq(struct request *rq) | |
1460 | { | |
1461 | return 0; | |
1462 | } | |
1463 | static inline int blk_rq_count_integrity_sg(struct request_queue *q, | |
1464 | struct bio *b) | |
1465 | { | |
1466 | return 0; | |
1467 | } | |
1468 | static inline int blk_rq_map_integrity_sg(struct request_queue *q, | |
1469 | struct bio *b, | |
1470 | struct scatterlist *s) | |
1471 | { | |
1472 | return 0; | |
1473 | } | |
1474 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) | |
1475 | { | |
1476 | return 0; | |
1477 | } | |
1478 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) | |
1479 | { | |
1480 | return NULL; | |
1481 | } | |
1482 | static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) | |
1483 | { | |
1484 | return 0; | |
1485 | } | |
1486 | static inline int blk_integrity_register(struct gendisk *d, | |
1487 | struct blk_integrity *b) | |
1488 | { | |
1489 | return 0; | |
1490 | } | |
1491 | static inline void blk_integrity_unregister(struct gendisk *d) | |
1492 | { | |
1493 | } | |
1494 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, | |
1495 | unsigned int segs) | |
1496 | { | |
1497 | } | |
1498 | static inline unsigned short queue_max_integrity_segments(struct request_queue *q) | |
1499 | { | |
1500 | return 0; | |
1501 | } | |
1502 | static inline int blk_integrity_merge_rq(struct request_queue *rq, | |
1503 | struct request *r1, | |
1504 | struct request *r2) | |
1505 | { | |
1506 | return 0; | |
1507 | } | |
1508 | static inline int blk_integrity_merge_bio(struct request_queue *rq, | |
1509 | struct request *r, | |
1510 | struct bio *b) | |
1511 | { | |
1512 | return 0; | |
1513 | } | |
1514 | static inline bool blk_integrity_is_initialized(struct gendisk *g) | |
1515 | { | |
1516 | return 0; | |
1517 | } | |
7ba1ba12 MP |
1518 | |
1519 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1520 | ||
08f85851 | 1521 | struct block_device_operations { |
d4430d62 | 1522 | int (*open) (struct block_device *, fmode_t); |
db2a144b | 1523 | void (*release) (struct gendisk *, fmode_t); |
d4430d62 AV |
1524 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1525 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1526 | int (*direct_access) (struct block_device *, sector_t, |
1527 | void **, unsigned long *); | |
77ea887e TH |
1528 | unsigned int (*check_events) (struct gendisk *disk, |
1529 | unsigned int clearing); | |
1530 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1531 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1532 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1533 | int (*revalidate_disk) (struct gendisk *); |
1534 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1535 | /* this callback is with swap_lock and sometimes page table lock held */ |
1536 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1537 | struct module *owner; |
1538 | }; | |
1539 | ||
633a08b8 AV |
1540 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1541 | unsigned long); | |
9361401e DH |
1542 | #else /* CONFIG_BLOCK */ |
1543 | /* | |
1544 | * stubs for when the block layer is configured out | |
1545 | */ | |
1546 | #define buffer_heads_over_limit 0 | |
1547 | ||
9361401e DH |
1548 | static inline long nr_blockdev_pages(void) |
1549 | { | |
1550 | return 0; | |
1551 | } | |
1552 | ||
1f940bdf JA |
1553 | struct blk_plug { |
1554 | }; | |
1555 | ||
1556 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1557 | { |
1558 | } | |
1559 | ||
1f940bdf | 1560 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1561 | { |
1562 | } | |
1563 | ||
1f940bdf | 1564 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1565 | { |
1566 | } | |
1567 | ||
a237c1c5 JA |
1568 | static inline void blk_schedule_flush_plug(struct task_struct *task) |
1569 | { | |
1570 | } | |
1571 | ||
1572 | ||
73c10101 JA |
1573 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) |
1574 | { | |
1575 | return false; | |
1576 | } | |
1577 | ||
9361401e DH |
1578 | #endif /* CONFIG_BLOCK */ |
1579 | ||
1da177e4 | 1580 | #endif |