Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
f5ff8422 JA |
4 | #ifdef CONFIG_BLOCK |
5 | ||
bcfd8d36 | 6 | #include <linux/sched.h> |
1da177e4 LT |
7 | #include <linux/major.h> |
8 | #include <linux/genhd.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/backing-dev.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/mempool.h> | |
16 | #include <linux/bio.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/stringify.h> | |
3e6053d7 | 19 | #include <linux/gfp.h> |
d351af01 | 20 | #include <linux/bsg.h> |
c7c22e4d | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | |
23 | #include <asm/scatterlist.h> | |
24 | ||
21b2f0c8 CH |
25 | struct scsi_ioctl_command; |
26 | ||
1da177e4 | 27 | struct request_queue; |
1da177e4 | 28 | struct elevator_queue; |
1da177e4 | 29 | struct request_pm_state; |
2056a782 | 30 | struct blk_trace; |
3d6392cf JA |
31 | struct request; |
32 | struct sg_io_hdr; | |
1da177e4 LT |
33 | |
34 | #define BLKDEV_MIN_RQ 4 | |
35 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
36 | ||
1da177e4 | 37 | struct request; |
8ffdc655 | 38 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
39 | |
40 | struct request_list { | |
1faa16d2 JA |
41 | /* |
42 | * count[], starved[], and wait[] are indexed by | |
43 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
44 | */ | |
1da177e4 LT |
45 | int count[2]; |
46 | int starved[2]; | |
cb98fc8b | 47 | int elvpriv; |
1da177e4 LT |
48 | mempool_t *rq_pool; |
49 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
50 | }; |
51 | ||
4aff5e23 JA |
52 | /* |
53 | * request command types | |
54 | */ | |
55 | enum rq_cmd_type_bits { | |
56 | REQ_TYPE_FS = 1, /* fs request */ | |
57 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
58 | REQ_TYPE_SENSE, /* sense request */ | |
59 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
60 | REQ_TYPE_PM_RESUME, /* resume request */ | |
61 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 | 62 | REQ_TYPE_SPECIAL, /* driver defined type */ |
4aff5e23 JA |
63 | /* |
64 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
65 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
66 | * private REQ_LB opcodes to differentiate what type of request this is | |
67 | */ | |
4aff5e23 | 68 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 69 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
70 | }; |
71 | ||
1da177e4 LT |
72 | #define BLK_MAX_CDB 16 |
73 | ||
74 | /* | |
63a71386 JA |
75 | * try to put the fields that are referenced together in the same cacheline. |
76 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
77 | * as well! | |
1da177e4 LT |
78 | */ |
79 | struct request { | |
ff856bad | 80 | struct list_head queuelist; |
c7c22e4d | 81 | struct call_single_data csd; |
ff856bad | 82 | |
165125e1 | 83 | struct request_queue *q; |
e6a1c874 | 84 | |
4aff5e23 JA |
85 | unsigned int cmd_flags; |
86 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 87 | unsigned long atomic_flags; |
1da177e4 | 88 | |
181fdde3 RK |
89 | int cpu; |
90 | ||
a2dec7b3 | 91 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 92 | unsigned int __data_len; /* total data len */ |
181fdde3 | 93 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
94 | |
95 | struct bio *bio; | |
96 | struct bio *biotail; | |
97 | ||
9817064b | 98 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
99 | /* |
100 | * The rb_node is only used inside the io scheduler, requests | |
101 | * are pruned when moved to the dispatch queue. So let the | |
102 | * completion_data share space with the rb_node. | |
103 | */ | |
104 | union { | |
105 | struct rb_node rb_node; /* sort/lookup */ | |
106 | void *completion_data; | |
107 | }; | |
9817064b | 108 | |
ff7d145f | 109 | /* |
7f1dc8a2 | 110 | * Three pointers are available for the IO schedulers, if they need |
ff7d145f JA |
111 | * more they have to dynamically allocate it. |
112 | */ | |
1da177e4 | 113 | void *elevator_private; |
ff7d145f | 114 | void *elevator_private2; |
7f1dc8a2 | 115 | void *elevator_private3; |
ff7d145f | 116 | |
8f34ee75 | 117 | struct gendisk *rq_disk; |
1da177e4 | 118 | unsigned long start_time; |
9195291e DS |
119 | #ifdef CONFIG_BLK_CGROUP |
120 | unsigned long long start_time_ns; | |
121 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
122 | #endif | |
1da177e4 LT |
123 | /* Number of scatter-gather DMA addr+len pairs after |
124 | * physical address coalescing is performed. | |
125 | */ | |
126 | unsigned short nr_phys_segments; | |
127 | ||
8f34ee75 JA |
128 | unsigned short ioprio; |
129 | ||
181fdde3 RK |
130 | int ref_count; |
131 | ||
731ec497 TH |
132 | void *special; /* opaque pointer available for LLD use */ |
133 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 134 | |
cdd60262 JA |
135 | int tag; |
136 | int errors; | |
137 | ||
1da177e4 LT |
138 | /* |
139 | * when request is used as a packet command carrier | |
140 | */ | |
d7e3c324 FT |
141 | unsigned char __cmd[BLK_MAX_CDB]; |
142 | unsigned char *cmd; | |
181fdde3 | 143 | unsigned short cmd_len; |
1da177e4 | 144 | |
7a85f889 | 145 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 146 | unsigned int sense_len; |
c3a4d78c | 147 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
148 | void *sense; |
149 | ||
242f9dcb JA |
150 | unsigned long deadline; |
151 | struct list_head timeout_list; | |
1da177e4 | 152 | unsigned int timeout; |
17e01f21 | 153 | int retries; |
1da177e4 | 154 | |
1da177e4 | 155 | /* |
c00895ab | 156 | * completion callback. |
1da177e4 LT |
157 | */ |
158 | rq_end_io_fn *end_io; | |
159 | void *end_io_data; | |
abae1fde FT |
160 | |
161 | /* for bidi */ | |
162 | struct request *next_rq; | |
1da177e4 LT |
163 | }; |
164 | ||
766ca442 FLVC |
165 | static inline unsigned short req_get_ioprio(struct request *req) |
166 | { | |
167 | return req->ioprio; | |
168 | } | |
169 | ||
1da177e4 | 170 | /* |
4aff5e23 | 171 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
172 | * requests. Some step values could eventually be made generic. |
173 | */ | |
174 | struct request_pm_state | |
175 | { | |
176 | /* PM state machine step value, currently driver specific */ | |
177 | int pm_step; | |
178 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
179 | u32 pm_state; | |
180 | void* data; /* for driver use */ | |
181 | }; | |
182 | ||
183 | #include <linux/elevator.h> | |
184 | ||
165125e1 JA |
185 | typedef void (request_fn_proc) (struct request_queue *q); |
186 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
187 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
28018c24 | 188 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
165125e1 | 189 | typedef void (unplug_fn) (struct request_queue *); |
1da177e4 LT |
190 | |
191 | struct bio_vec; | |
cc371e66 AK |
192 | struct bvec_merge_data { |
193 | struct block_device *bi_bdev; | |
194 | sector_t bi_sector; | |
195 | unsigned bi_size; | |
196 | unsigned long bi_rw; | |
197 | }; | |
198 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
199 | struct bio_vec *); | |
ff856bad | 200 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 201 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 202 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 203 | |
242f9dcb JA |
204 | enum blk_eh_timer_return { |
205 | BLK_EH_NOT_HANDLED, | |
206 | BLK_EH_HANDLED, | |
207 | BLK_EH_RESET_TIMER, | |
208 | }; | |
209 | ||
210 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
211 | ||
1da177e4 LT |
212 | enum blk_queue_state { |
213 | Queue_down, | |
214 | Queue_up, | |
215 | }; | |
216 | ||
1da177e4 LT |
217 | struct blk_queue_tag { |
218 | struct request **tag_index; /* map of busy tags */ | |
219 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
220 | int busy; /* current depth */ |
221 | int max_depth; /* what we will send to device */ | |
ba025082 | 222 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
223 | atomic_t refcnt; /* map can be shared */ |
224 | }; | |
225 | ||
abf54393 FT |
226 | #define BLK_SCSI_MAX_CMDS (256) |
227 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
228 | ||
025146e1 MP |
229 | struct queue_limits { |
230 | unsigned long bounce_pfn; | |
231 | unsigned long seg_boundary_mask; | |
232 | ||
233 | unsigned int max_hw_sectors; | |
234 | unsigned int max_sectors; | |
235 | unsigned int max_segment_size; | |
c72758f3 MP |
236 | unsigned int physical_block_size; |
237 | unsigned int alignment_offset; | |
238 | unsigned int io_min; | |
239 | unsigned int io_opt; | |
67efc925 | 240 | unsigned int max_discard_sectors; |
86b37281 MP |
241 | unsigned int discard_granularity; |
242 | unsigned int discard_alignment; | |
025146e1 MP |
243 | |
244 | unsigned short logical_block_size; | |
8a78362c | 245 | unsigned short max_segments; |
025146e1 | 246 | |
c72758f3 | 247 | unsigned char misaligned; |
86b37281 | 248 | unsigned char discard_misaligned; |
025146e1 | 249 | unsigned char no_cluster; |
98262f27 | 250 | signed char discard_zeroes_data; |
025146e1 MP |
251 | }; |
252 | ||
1da177e4 LT |
253 | struct request_queue |
254 | { | |
255 | /* | |
256 | * Together with queue_head for cacheline sharing | |
257 | */ | |
258 | struct list_head queue_head; | |
259 | struct request *last_merge; | |
b374d18a | 260 | struct elevator_queue *elevator; |
1da177e4 LT |
261 | |
262 | /* | |
263 | * the queue request freelist, one for reads and one for writes | |
264 | */ | |
265 | struct request_list rq; | |
266 | ||
267 | request_fn_proc *request_fn; | |
1da177e4 LT |
268 | make_request_fn *make_request_fn; |
269 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 270 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 LT |
271 | unplug_fn *unplug_fn; |
272 | merge_bvec_fn *merge_bvec_fn; | |
ff856bad | 273 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 274 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 275 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 276 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 277 | |
8922e16c TH |
278 | /* |
279 | * Dispatch queue sorting | |
280 | */ | |
1b47f531 | 281 | sector_t end_sector; |
8922e16c | 282 | struct request *boundary_rq; |
8922e16c | 283 | |
1da177e4 LT |
284 | /* |
285 | * Auto-unplugging state | |
286 | */ | |
287 | struct timer_list unplug_timer; | |
288 | int unplug_thresh; /* After this many requests */ | |
289 | unsigned long unplug_delay; /* After this many jiffies */ | |
290 | struct work_struct unplug_work; | |
291 | ||
292 | struct backing_dev_info backing_dev_info; | |
293 | ||
294 | /* | |
295 | * The queue owner gets to use this for whatever they like. | |
296 | * ll_rw_blk doesn't touch it. | |
297 | */ | |
298 | void *queuedata; | |
299 | ||
1da177e4 LT |
300 | /* |
301 | * queue needs bounce pages for pages above this limit | |
302 | */ | |
8267e268 | 303 | gfp_t bounce_gfp; |
1da177e4 LT |
304 | |
305 | /* | |
306 | * various queue flags, see QUEUE_* below | |
307 | */ | |
308 | unsigned long queue_flags; | |
309 | ||
310 | /* | |
152587de | 311 | * protects queue structures from reentrancy. ->__queue_lock should |
312 | * _never_ be used directly, it is queue private. always use | |
313 | * ->queue_lock. | |
1da177e4 | 314 | */ |
152587de | 315 | spinlock_t __queue_lock; |
1da177e4 LT |
316 | spinlock_t *queue_lock; |
317 | ||
318 | /* | |
319 | * queue kobject | |
320 | */ | |
321 | struct kobject kobj; | |
322 | ||
323 | /* | |
324 | * queue settings | |
325 | */ | |
326 | unsigned long nr_requests; /* Max # of requests */ | |
327 | unsigned int nr_congestion_on; | |
328 | unsigned int nr_congestion_off; | |
329 | unsigned int nr_batching; | |
330 | ||
fa0ccd83 JB |
331 | void *dma_drain_buffer; |
332 | unsigned int dma_drain_size; | |
e3790c7d | 333 | unsigned int dma_pad_mask; |
1da177e4 LT |
334 | unsigned int dma_alignment; |
335 | ||
336 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 337 | struct list_head tag_busy_list; |
1da177e4 | 338 | |
15853af9 | 339 | unsigned int nr_sorted; |
0a7ae2ff | 340 | unsigned int in_flight[2]; |
1da177e4 | 341 | |
242f9dcb JA |
342 | unsigned int rq_timeout; |
343 | struct timer_list timeout; | |
344 | struct list_head timeout_list; | |
345 | ||
025146e1 MP |
346 | struct queue_limits limits; |
347 | ||
1da177e4 LT |
348 | /* |
349 | * sg stuff | |
350 | */ | |
351 | unsigned int sg_timeout; | |
352 | unsigned int sg_reserved_size; | |
1946089a | 353 | int node; |
6c5c9341 | 354 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 355 | struct blk_trace *blk_trace; |
6c5c9341 | 356 | #endif |
1da177e4 | 357 | /* |
4913efe4 | 358 | * for flush operations |
1da177e4 | 359 | */ |
4913efe4 | 360 | unsigned int flush_flags; |
dd4c133f TH |
361 | unsigned int flush_seq; |
362 | int flush_err; | |
363 | struct request flush_rq; | |
364 | struct request *orig_flush_rq; | |
365 | struct list_head pending_flushes; | |
483f4afc AV |
366 | |
367 | struct mutex sysfs_lock; | |
d351af01 FT |
368 | |
369 | #if defined(CONFIG_BLK_DEV_BSG) | |
370 | struct bsg_class_device bsg_dev; | |
371 | #endif | |
1da177e4 LT |
372 | }; |
373 | ||
1da177e4 LT |
374 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
375 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
376 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
377 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
378 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
379 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
380 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
381 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 382 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 383 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 384 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 385 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 386 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 387 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 388 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 389 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 390 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 391 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 392 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 393 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
8d57a98c | 394 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
bc58ba94 JA |
395 | |
396 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
397 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
01e97f6b | 398 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
399 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
400 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 401 | |
8f45c1a5 LT |
402 | static inline int queue_is_locked(struct request_queue *q) |
403 | { | |
7663c1e2 | 404 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
405 | spinlock_t *lock = q->queue_lock; |
406 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
407 | #else |
408 | return 1; | |
409 | #endif | |
8f45c1a5 LT |
410 | } |
411 | ||
75ad23bc NP |
412 | static inline void queue_flag_set_unlocked(unsigned int flag, |
413 | struct request_queue *q) | |
414 | { | |
415 | __set_bit(flag, &q->queue_flags); | |
416 | } | |
417 | ||
e48ec690 JA |
418 | static inline int queue_flag_test_and_clear(unsigned int flag, |
419 | struct request_queue *q) | |
420 | { | |
421 | WARN_ON_ONCE(!queue_is_locked(q)); | |
422 | ||
423 | if (test_bit(flag, &q->queue_flags)) { | |
424 | __clear_bit(flag, &q->queue_flags); | |
425 | return 1; | |
426 | } | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | static inline int queue_flag_test_and_set(unsigned int flag, | |
432 | struct request_queue *q) | |
433 | { | |
434 | WARN_ON_ONCE(!queue_is_locked(q)); | |
435 | ||
436 | if (!test_bit(flag, &q->queue_flags)) { | |
437 | __set_bit(flag, &q->queue_flags); | |
438 | return 0; | |
439 | } | |
440 | ||
441 | return 1; | |
442 | } | |
443 | ||
75ad23bc NP |
444 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
445 | { | |
8f45c1a5 | 446 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
447 | __set_bit(flag, &q->queue_flags); |
448 | } | |
449 | ||
450 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
451 | struct request_queue *q) | |
452 | { | |
453 | __clear_bit(flag, &q->queue_flags); | |
454 | } | |
455 | ||
0a7ae2ff JA |
456 | static inline int queue_in_flight(struct request_queue *q) |
457 | { | |
458 | return q->in_flight[0] + q->in_flight[1]; | |
459 | } | |
460 | ||
75ad23bc NP |
461 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
462 | { | |
8f45c1a5 | 463 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
464 | __clear_bit(flag, &q->queue_flags); |
465 | } | |
466 | ||
1da177e4 LT |
467 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) |
468 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
469 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 470 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
471 | #define blk_queue_noxmerges(q) \ |
472 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 473 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 474 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 475 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
476 | #define blk_queue_stackable(q) \ |
477 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 478 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
479 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
480 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 481 | |
33659ebb CH |
482 | #define blk_noretry_request(rq) \ |
483 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
484 | REQ_FAILFAST_DRIVER)) | |
485 | ||
486 | #define blk_account_rq(rq) \ | |
487 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
488 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
489 | ((rq)->cmd_flags & REQ_DISCARD))) | |
490 | ||
1da177e4 | 491 | #define blk_pm_request(rq) \ |
33659ebb CH |
492 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
493 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 494 | |
ab780f1e | 495 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 496 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
497 | /* rq->queuelist of dequeued request must be list_empty() */ |
498 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
499 | |
500 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
501 | ||
4aff5e23 | 502 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 503 | |
9e2585a8 | 504 | /* |
1faa16d2 | 505 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 506 | */ |
1faa16d2 JA |
507 | static inline bool rw_is_sync(unsigned int rw_flags) |
508 | { | |
7b6d91da | 509 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
510 | } |
511 | ||
512 | static inline bool rq_is_sync(struct request *rq) | |
513 | { | |
514 | return rw_is_sync(rq->cmd_flags); | |
515 | } | |
516 | ||
1faa16d2 | 517 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 518 | { |
1faa16d2 JA |
519 | if (sync) |
520 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
521 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
522 | } |
523 | ||
1faa16d2 | 524 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 525 | { |
1faa16d2 JA |
526 | if (sync) |
527 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 528 | else |
1faa16d2 | 529 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
530 | } |
531 | ||
1faa16d2 | 532 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 533 | { |
1faa16d2 JA |
534 | if (sync) |
535 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 536 | else |
1faa16d2 | 537 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
538 | } |
539 | ||
540 | ||
541 | /* | |
542 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
543 | * it already be started by driver. | |
544 | */ | |
545 | #define RQ_NOMERGE_FLAGS \ | |
4fed947c TH |
546 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER | \ |
547 | REQ_FLUSH | REQ_FUA) | |
1da177e4 | 548 | #define rq_mergeable(rq) \ |
e17fc0a1 | 549 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
550 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
551 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 552 | |
1da177e4 LT |
553 | /* |
554 | * q->prep_rq_fn return values | |
555 | */ | |
556 | #define BLKPREP_OK 0 /* serve it */ | |
557 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
558 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
559 | ||
560 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
561 | ||
562 | /* | |
563 | * standard bounce addresses: | |
564 | * | |
565 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
566 | * BLK_BOUNCE_ANY : don't bounce anything | |
567 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
568 | */ | |
2472892a AK |
569 | |
570 | #if BITS_PER_LONG == 32 | |
1da177e4 | 571 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
572 | #else |
573 | #define BLK_BOUNCE_HIGH -1ULL | |
574 | #endif | |
575 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 576 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 577 | |
3d6392cf JA |
578 | /* |
579 | * default timeout for SG_IO if none specified | |
580 | */ | |
581 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 582 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 583 | |
2a7326b5 | 584 | #ifdef CONFIG_BOUNCE |
1da177e4 | 585 | extern int init_emergency_isa_pool(void); |
165125e1 | 586 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
587 | #else |
588 | static inline int init_emergency_isa_pool(void) | |
589 | { | |
590 | return 0; | |
591 | } | |
165125e1 | 592 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
593 | { |
594 | } | |
595 | #endif /* CONFIG_MMU */ | |
596 | ||
152e283f FT |
597 | struct rq_map_data { |
598 | struct page **pages; | |
599 | int page_order; | |
600 | int nr_entries; | |
56c451f4 | 601 | unsigned long offset; |
97ae77a1 | 602 | int null_mapped; |
ecb554a8 | 603 | int from_user; |
152e283f FT |
604 | }; |
605 | ||
5705f702 N |
606 | struct req_iterator { |
607 | int i; | |
608 | struct bio *bio; | |
609 | }; | |
610 | ||
611 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
612 | #define for_each_bio(_bio) \ |
613 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 614 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
615 | if ((rq->bio)) \ |
616 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
617 | ||
5705f702 N |
618 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
619 | __rq_for_each_bio(_iter.bio, _rq) \ | |
620 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
621 | ||
622 | #define rq_iter_last(rq, _iter) \ | |
623 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
624 | ||
2d4dc890 IL |
625 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
626 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
627 | #endif | |
628 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
629 | extern void rq_flush_dcache_pages(struct request *rq); | |
630 | #else | |
631 | static inline void rq_flush_dcache_pages(struct request *rq) | |
632 | { | |
633 | } | |
634 | #endif | |
635 | ||
1da177e4 LT |
636 | extern int blk_register_queue(struct gendisk *disk); |
637 | extern void blk_unregister_queue(struct gendisk *disk); | |
638 | extern void register_disk(struct gendisk *dev); | |
639 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 640 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 641 | extern void blk_put_request(struct request *); |
165125e1 | 642 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 643 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
644 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
645 | gfp_t); | |
165125e1 JA |
646 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
647 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
66ac0280 CH |
648 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
649 | unsigned int len); | |
82124d60 | 650 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 651 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
652 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
653 | struct bio_set *bs, gfp_t gfp_mask, | |
654 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
655 | void *data); | |
656 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
657 | extern int blk_insert_cloned_request(struct request_queue *q, |
658 | struct request *rq); | |
165125e1 | 659 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 660 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
661 | extern int blk_remove_plug(struct request_queue *); |
662 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
663 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
664 | unsigned int, void __user *); | |
e915e872 AV |
665 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
666 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
667 | |
668 | /* | |
669 | * A queue has just exitted congestion. Note this in the global counter of | |
670 | * congested queues, and wake up anyone who was waiting for requests to be | |
671 | * put back. | |
672 | */ | |
8aa7e847 | 673 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 674 | { |
8aa7e847 | 675 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
676 | } |
677 | ||
678 | /* | |
679 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
680 | * state flags and increment the global gounter of congested queues. | |
681 | */ | |
8aa7e847 | 682 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 683 | { |
8aa7e847 | 684 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
685 | } |
686 | ||
165125e1 JA |
687 | extern void blk_start_queue(struct request_queue *q); |
688 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 689 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 690 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 691 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 692 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 693 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
694 | struct rq_map_data *, void __user *, unsigned long, |
695 | gfp_t); | |
8e5cfc45 | 696 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
697 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
698 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
699 | struct rq_map_data *, struct sg_iovec *, int, |
700 | unsigned int, gfp_t); | |
165125e1 | 701 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 702 | struct request *, int); |
165125e1 | 703 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 704 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 705 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 706 | |
165125e1 | 707 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
708 | { |
709 | return bdev->bd_disk->queue; | |
710 | } | |
711 | ||
5efccd17 | 712 | /* |
80a761fd TH |
713 | * blk_rq_pos() : the current sector |
714 | * blk_rq_bytes() : bytes left in the entire request | |
715 | * blk_rq_cur_bytes() : bytes left in the current segment | |
716 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
717 | * blk_rq_sectors() : sectors left in the entire request | |
718 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 719 | */ |
5b93629b TH |
720 | static inline sector_t blk_rq_pos(const struct request *rq) |
721 | { | |
a2dec7b3 | 722 | return rq->__sector; |
2e46e8b2 TH |
723 | } |
724 | ||
725 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
726 | { | |
a2dec7b3 | 727 | return rq->__data_len; |
5b93629b TH |
728 | } |
729 | ||
2e46e8b2 TH |
730 | static inline int blk_rq_cur_bytes(const struct request *rq) |
731 | { | |
732 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
733 | } | |
5efccd17 | 734 | |
80a761fd TH |
735 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
736 | ||
5b93629b TH |
737 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
738 | { | |
2e46e8b2 | 739 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
740 | } |
741 | ||
742 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
743 | { | |
2e46e8b2 | 744 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
745 | } |
746 | ||
9934c8c0 TH |
747 | /* |
748 | * Request issue related functions. | |
749 | */ | |
750 | extern struct request *blk_peek_request(struct request_queue *q); | |
751 | extern void blk_start_request(struct request *rq); | |
752 | extern struct request *blk_fetch_request(struct request_queue *q); | |
753 | ||
1da177e4 | 754 | /* |
2e60e022 TH |
755 | * Request completion related functions. |
756 | * | |
757 | * blk_update_request() completes given number of bytes and updates | |
758 | * the request without completing it. | |
759 | * | |
f06d9a2b TH |
760 | * blk_end_request() and friends. __blk_end_request() must be called |
761 | * with the request queue spinlock acquired. | |
1da177e4 LT |
762 | * |
763 | * Several drivers define their own end_request and call | |
3bcddeac KU |
764 | * blk_end_request() for parts of the original function. |
765 | * This prevents code duplication in drivers. | |
1da177e4 | 766 | */ |
2e60e022 TH |
767 | extern bool blk_update_request(struct request *rq, int error, |
768 | unsigned int nr_bytes); | |
b1f74493 FT |
769 | extern bool blk_end_request(struct request *rq, int error, |
770 | unsigned int nr_bytes); | |
771 | extern void blk_end_request_all(struct request *rq, int error); | |
772 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 773 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
774 | extern bool __blk_end_request(struct request *rq, int error, |
775 | unsigned int nr_bytes); | |
776 | extern void __blk_end_request_all(struct request *rq, int error); | |
777 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 778 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 779 | |
ff856bad | 780 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
781 | extern void __blk_complete_request(struct request *); |
782 | extern void blk_abort_request(struct request *); | |
11914a53 | 783 | extern void blk_abort_queue(struct request_queue *); |
28018c24 | 784 | extern void blk_unprep_request(struct request *); |
ff856bad | 785 | |
1da177e4 LT |
786 | /* |
787 | * Access functions for manipulating queue properties | |
788 | */ | |
165125e1 | 789 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 790 | spinlock_t *lock, int node_id); |
01effb0d MS |
791 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
792 | request_fn_proc *, | |
793 | spinlock_t *, int node_id); | |
165125e1 | 794 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
795 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
796 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
797 | extern void blk_cleanup_queue(struct request_queue *); |
798 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
799 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 800 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 801 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 802 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
803 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
804 | unsigned int max_discard_sectors); | |
e1defc4f | 805 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
c72758f3 MP |
806 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
807 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
808 | unsigned int alignment); | |
7c958e32 | 809 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 810 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 811 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 812 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 813 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
814 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
815 | sector_t offset); | |
17be8c24 MP |
816 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
817 | sector_t offset); | |
c72758f3 MP |
818 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
819 | sector_t offset); | |
165125e1 | 820 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 821 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 822 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
823 | extern int blk_queue_dma_drain(struct request_queue *q, |
824 | dma_drain_needed_fn *dma_drain_needed, | |
825 | void *buf, unsigned int size); | |
ef9e3fac | 826 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
827 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
828 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 829 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
830 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
831 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 832 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 833 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
834 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
835 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 836 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
1da177e4 | 837 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 838 | |
165125e1 | 839 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 840 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 841 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 842 | extern long nr_blockdev_pages(void); |
1da177e4 | 843 | |
165125e1 JA |
844 | int blk_get_queue(struct request_queue *); |
845 | struct request_queue *blk_alloc_queue(gfp_t); | |
846 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
847 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
848 | |
849 | /* | |
850 | * tag stuff | |
851 | */ | |
4aff5e23 | 852 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
853 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
854 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
855 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
856 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
857 | extern void blk_queue_free_tags(struct request_queue *); | |
858 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
859 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
860 | extern struct blk_queue_tag *blk_init_tags(int); |
861 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 862 | |
f583f492 DS |
863 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
864 | int tag) | |
865 | { | |
866 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
867 | return NULL; | |
868 | return bqt->tag_index[tag]; | |
869 | } | |
fbd9b09a DM |
870 | enum{ |
871 | BLKDEV_WAIT, /* wait for completion */ | |
8d57a98c | 872 | BLKDEV_SECURE, /* secure discard */ |
fbd9b09a DM |
873 | }; |
874 | #define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) | |
8d57a98c | 875 | #define BLKDEV_IFL_SECURE (1 << BLKDEV_SECURE) |
fbd9b09a DM |
876 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, |
877 | unsigned long); | |
878 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
879 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 DM |
880 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
881 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
2cf6d26a CH |
882 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
883 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 884 | { |
2cf6d26a CH |
885 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
886 | nr_blocks << (sb->s_blocksize_bits - 9), | |
887 | gfp_mask, flags); | |
fb2dce86 | 888 | } |
1da177e4 | 889 | |
018e0446 | 890 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 891 | |
eb28d31b MP |
892 | enum blk_default_limits { |
893 | BLK_MAX_SEGMENTS = 128, | |
894 | BLK_SAFE_MAX_SECTORS = 255, | |
895 | BLK_DEF_MAX_SECTORS = 1024, | |
896 | BLK_MAX_SEGMENT_SIZE = 65536, | |
897 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
898 | }; | |
0e435ac2 | 899 | |
1da177e4 LT |
900 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
901 | ||
ae03bf63 MP |
902 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
903 | { | |
025146e1 | 904 | return q->limits.bounce_pfn; |
ae03bf63 MP |
905 | } |
906 | ||
907 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
908 | { | |
025146e1 | 909 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
910 | } |
911 | ||
912 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
913 | { | |
025146e1 | 914 | return q->limits.max_sectors; |
ae03bf63 MP |
915 | } |
916 | ||
917 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
918 | { | |
025146e1 | 919 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
920 | } |
921 | ||
8a78362c | 922 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 923 | { |
8a78362c | 924 | return q->limits.max_segments; |
ae03bf63 MP |
925 | } |
926 | ||
927 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
928 | { | |
025146e1 | 929 | return q->limits.max_segment_size; |
ae03bf63 MP |
930 | } |
931 | ||
e1defc4f | 932 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
933 | { |
934 | int retval = 512; | |
935 | ||
025146e1 MP |
936 | if (q && q->limits.logical_block_size) |
937 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
938 | |
939 | return retval; | |
940 | } | |
941 | ||
e1defc4f | 942 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 943 | { |
e1defc4f | 944 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
945 | } |
946 | ||
c72758f3 MP |
947 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
948 | { | |
949 | return q->limits.physical_block_size; | |
950 | } | |
951 | ||
ac481c20 MP |
952 | static inline int bdev_physical_block_size(struct block_device *bdev) |
953 | { | |
954 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
955 | } | |
956 | ||
c72758f3 MP |
957 | static inline unsigned int queue_io_min(struct request_queue *q) |
958 | { | |
959 | return q->limits.io_min; | |
960 | } | |
961 | ||
ac481c20 MP |
962 | static inline int bdev_io_min(struct block_device *bdev) |
963 | { | |
964 | return queue_io_min(bdev_get_queue(bdev)); | |
965 | } | |
966 | ||
c72758f3 MP |
967 | static inline unsigned int queue_io_opt(struct request_queue *q) |
968 | { | |
969 | return q->limits.io_opt; | |
970 | } | |
971 | ||
ac481c20 MP |
972 | static inline int bdev_io_opt(struct block_device *bdev) |
973 | { | |
974 | return queue_io_opt(bdev_get_queue(bdev)); | |
975 | } | |
976 | ||
c72758f3 MP |
977 | static inline int queue_alignment_offset(struct request_queue *q) |
978 | { | |
ac481c20 | 979 | if (q->limits.misaligned) |
c72758f3 MP |
980 | return -1; |
981 | ||
ac481c20 | 982 | return q->limits.alignment_offset; |
c72758f3 MP |
983 | } |
984 | ||
e03a72e1 | 985 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
986 | { |
987 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 988 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 989 | |
e03a72e1 MP |
990 | return (granularity + lim->alignment_offset - alignment) |
991 | & (granularity - 1); | |
c72758f3 MP |
992 | } |
993 | ||
ac481c20 MP |
994 | static inline int bdev_alignment_offset(struct block_device *bdev) |
995 | { | |
996 | struct request_queue *q = bdev_get_queue(bdev); | |
997 | ||
998 | if (q->limits.misaligned) | |
999 | return -1; | |
1000 | ||
1001 | if (bdev != bdev->bd_contains) | |
1002 | return bdev->bd_part->alignment_offset; | |
1003 | ||
1004 | return q->limits.alignment_offset; | |
1005 | } | |
1006 | ||
86b37281 MP |
1007 | static inline int queue_discard_alignment(struct request_queue *q) |
1008 | { | |
1009 | if (q->limits.discard_misaligned) | |
1010 | return -1; | |
1011 | ||
1012 | return q->limits.discard_alignment; | |
1013 | } | |
1014 | ||
e03a72e1 | 1015 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1016 | { |
dd3d145d MP |
1017 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1018 | ||
1019 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1020 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1021 | } |
1022 | ||
98262f27 MP |
1023 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1024 | { | |
1025 | if (q->limits.discard_zeroes_data == 1) | |
1026 | return 1; | |
1027 | ||
1028 | return 0; | |
1029 | } | |
1030 | ||
1031 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1032 | { | |
1033 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1034 | } | |
1035 | ||
165125e1 | 1036 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1037 | { |
482eb689 | 1038 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1039 | } |
1040 | ||
87904074 FT |
1041 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1042 | unsigned int len) | |
1043 | { | |
1044 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1045 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1046 | } | |
1047 | ||
1da177e4 LT |
1048 | /* assumes size > 256 */ |
1049 | static inline unsigned int blksize_bits(unsigned int size) | |
1050 | { | |
1051 | unsigned int bits = 8; | |
1052 | do { | |
1053 | bits++; | |
1054 | size >>= 1; | |
1055 | } while (size > 256); | |
1056 | return bits; | |
1057 | } | |
1058 | ||
2befb9e3 | 1059 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1060 | { |
1061 | return bdev->bd_block_size; | |
1062 | } | |
1063 | ||
1064 | typedef struct {struct page *v;} Sector; | |
1065 | ||
1066 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1067 | ||
1068 | static inline void put_dev_sector(Sector p) | |
1069 | { | |
1070 | page_cache_release(p.v); | |
1071 | } | |
1072 | ||
1073 | struct work_struct; | |
18887ad9 | 1074 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1075 | |
9195291e | 1076 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1077 | /* |
1078 | * This should not be using sched_clock(). A real patch is in progress | |
1079 | * to fix this up, until that is in place we need to disable preemption | |
1080 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1081 | */ | |
9195291e DS |
1082 | static inline void set_start_time_ns(struct request *req) |
1083 | { | |
28f4197e | 1084 | preempt_disable(); |
9195291e | 1085 | req->start_time_ns = sched_clock(); |
28f4197e | 1086 | preempt_enable(); |
9195291e DS |
1087 | } |
1088 | ||
1089 | static inline void set_io_start_time_ns(struct request *req) | |
1090 | { | |
28f4197e | 1091 | preempt_disable(); |
9195291e | 1092 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1093 | preempt_enable(); |
9195291e | 1094 | } |
84c124da DS |
1095 | |
1096 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1097 | { | |
1098 | return req->start_time_ns; | |
1099 | } | |
1100 | ||
1101 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1102 | { | |
1103 | return req->io_start_time_ns; | |
1104 | } | |
9195291e DS |
1105 | #else |
1106 | static inline void set_start_time_ns(struct request *req) {} | |
1107 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1108 | static inline uint64_t rq_start_time_ns(struct request *req) |
1109 | { | |
1110 | return 0; | |
1111 | } | |
1112 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1113 | { | |
1114 | return 0; | |
1115 | } | |
9195291e DS |
1116 | #endif |
1117 | ||
1da177e4 LT |
1118 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1119 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1120 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1121 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1122 | ||
7ba1ba12 MP |
1123 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1124 | ||
b24498d4 JA |
1125 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1126 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1127 | |
1128 | struct blk_integrity_exchg { | |
1129 | void *prot_buf; | |
1130 | void *data_buf; | |
1131 | sector_t sector; | |
1132 | unsigned int data_size; | |
1133 | unsigned short sector_size; | |
1134 | const char *disk_name; | |
1135 | }; | |
1136 | ||
1137 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1138 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1139 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1140 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1141 | ||
1142 | struct blk_integrity { | |
1143 | integrity_gen_fn *generate_fn; | |
1144 | integrity_vrfy_fn *verify_fn; | |
1145 | integrity_set_tag_fn *set_tag_fn; | |
1146 | integrity_get_tag_fn *get_tag_fn; | |
1147 | ||
1148 | unsigned short flags; | |
1149 | unsigned short tuple_size; | |
1150 | unsigned short sector_size; | |
1151 | unsigned short tag_size; | |
1152 | ||
1153 | const char *name; | |
1154 | ||
1155 | struct kobject kobj; | |
1156 | }; | |
1157 | ||
1158 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1159 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1160 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1161 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1162 | extern int blk_rq_count_integrity_sg(struct request *); | |
1163 | ||
b04accc4 JA |
1164 | static inline |
1165 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1166 | { | |
1167 | return bdev->bd_disk->integrity; | |
1168 | } | |
1169 | ||
b02739b0 MP |
1170 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1171 | { | |
1172 | return disk->integrity; | |
1173 | } | |
1174 | ||
7ba1ba12 MP |
1175 | static inline int blk_integrity_rq(struct request *rq) |
1176 | { | |
d442cc44 MP |
1177 | if (rq->bio == NULL) |
1178 | return 0; | |
1179 | ||
7ba1ba12 MP |
1180 | return bio_integrity(rq->bio); |
1181 | } | |
1182 | ||
1183 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1184 | ||
1185 | #define blk_integrity_rq(rq) (0) | |
1186 | #define blk_rq_count_integrity_sg(a) (0) | |
1187 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1188 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1189 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1190 | #define blk_integrity_compare(a, b) (0) |
1191 | #define blk_integrity_register(a, b) (0) | |
1192 | #define blk_integrity_unregister(a) do { } while (0); | |
1193 | ||
1194 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1195 | ||
08f85851 | 1196 | struct block_device_operations { |
d4430d62 AV |
1197 | int (*open) (struct block_device *, fmode_t); |
1198 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1199 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1200 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1201 | int (*direct_access) (struct block_device *, sector_t, |
1202 | void **, unsigned long *); | |
1203 | int (*media_changed) (struct gendisk *); | |
c3e33e04 | 1204 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1205 | int (*revalidate_disk) (struct gendisk *); |
1206 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1207 | /* this callback is with swap_lock and sometimes page table lock held */ |
1208 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1209 | struct module *owner; |
1210 | }; | |
1211 | ||
633a08b8 AV |
1212 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1213 | unsigned long); | |
9361401e DH |
1214 | #else /* CONFIG_BLOCK */ |
1215 | /* | |
1216 | * stubs for when the block layer is configured out | |
1217 | */ | |
1218 | #define buffer_heads_over_limit 0 | |
1219 | ||
9361401e DH |
1220 | static inline long nr_blockdev_pages(void) |
1221 | { | |
1222 | return 0; | |
1223 | } | |
1224 | ||
9361401e DH |
1225 | #endif /* CONFIG_BLOCK */ |
1226 | ||
1da177e4 | 1227 | #endif |