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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 | |
ae1b1539 | 102 | * flush fields share space with the rb_node. |
e6a1c874 JA |
103 | */ |
104 | union { | |
105 | struct rb_node rb_node; /* sort/lookup */ | |
ae1b1539 TH |
106 | struct { |
107 | unsigned int seq; | |
108 | struct list_head list; | |
109 | } flush; | |
e6a1c874 | 110 | }; |
9817064b | 111 | |
ae1b1539 TH |
112 | void *completion_data; |
113 | ||
ff7d145f | 114 | /* |
7f1dc8a2 | 115 | * Three pointers are available for the IO schedulers, if they need |
ff7d145f JA |
116 | * more they have to dynamically allocate it. |
117 | */ | |
1da177e4 | 118 | void *elevator_private; |
ff7d145f | 119 | void *elevator_private2; |
7f1dc8a2 | 120 | void *elevator_private3; |
ff7d145f | 121 | |
8f34ee75 | 122 | struct gendisk *rq_disk; |
1da177e4 | 123 | unsigned long start_time; |
9195291e DS |
124 | #ifdef CONFIG_BLK_CGROUP |
125 | unsigned long long start_time_ns; | |
126 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
127 | #endif | |
1da177e4 LT |
128 | /* Number of scatter-gather DMA addr+len pairs after |
129 | * physical address coalescing is performed. | |
130 | */ | |
131 | unsigned short nr_phys_segments; | |
13f05c8d MP |
132 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
133 | unsigned short nr_integrity_segments; | |
134 | #endif | |
1da177e4 | 135 | |
8f34ee75 JA |
136 | unsigned short ioprio; |
137 | ||
181fdde3 RK |
138 | int ref_count; |
139 | ||
731ec497 TH |
140 | void *special; /* opaque pointer available for LLD use */ |
141 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 142 | |
cdd60262 JA |
143 | int tag; |
144 | int errors; | |
145 | ||
1da177e4 LT |
146 | /* |
147 | * when request is used as a packet command carrier | |
148 | */ | |
d7e3c324 FT |
149 | unsigned char __cmd[BLK_MAX_CDB]; |
150 | unsigned char *cmd; | |
181fdde3 | 151 | unsigned short cmd_len; |
1da177e4 | 152 | |
7a85f889 | 153 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 154 | unsigned int sense_len; |
c3a4d78c | 155 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
156 | void *sense; |
157 | ||
242f9dcb JA |
158 | unsigned long deadline; |
159 | struct list_head timeout_list; | |
1da177e4 | 160 | unsigned int timeout; |
17e01f21 | 161 | int retries; |
1da177e4 | 162 | |
1da177e4 | 163 | /* |
c00895ab | 164 | * completion callback. |
1da177e4 LT |
165 | */ |
166 | rq_end_io_fn *end_io; | |
167 | void *end_io_data; | |
abae1fde FT |
168 | |
169 | /* for bidi */ | |
170 | struct request *next_rq; | |
1da177e4 LT |
171 | }; |
172 | ||
766ca442 FLVC |
173 | static inline unsigned short req_get_ioprio(struct request *req) |
174 | { | |
175 | return req->ioprio; | |
176 | } | |
177 | ||
1da177e4 | 178 | /* |
4aff5e23 | 179 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
180 | * requests. Some step values could eventually be made generic. |
181 | */ | |
182 | struct request_pm_state | |
183 | { | |
184 | /* PM state machine step value, currently driver specific */ | |
185 | int pm_step; | |
186 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
187 | u32 pm_state; | |
188 | void* data; /* for driver use */ | |
189 | }; | |
190 | ||
191 | #include <linux/elevator.h> | |
192 | ||
165125e1 JA |
193 | typedef void (request_fn_proc) (struct request_queue *q); |
194 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
195 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
28018c24 | 196 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
165125e1 | 197 | typedef void (unplug_fn) (struct request_queue *); |
1da177e4 LT |
198 | |
199 | struct bio_vec; | |
cc371e66 AK |
200 | struct bvec_merge_data { |
201 | struct block_device *bi_bdev; | |
202 | sector_t bi_sector; | |
203 | unsigned bi_size; | |
204 | unsigned long bi_rw; | |
205 | }; | |
206 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
207 | struct bio_vec *); | |
ff856bad | 208 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 209 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 210 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 211 | |
242f9dcb JA |
212 | enum blk_eh_timer_return { |
213 | BLK_EH_NOT_HANDLED, | |
214 | BLK_EH_HANDLED, | |
215 | BLK_EH_RESET_TIMER, | |
216 | }; | |
217 | ||
218 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
219 | ||
1da177e4 LT |
220 | enum blk_queue_state { |
221 | Queue_down, | |
222 | Queue_up, | |
223 | }; | |
224 | ||
1da177e4 LT |
225 | struct blk_queue_tag { |
226 | struct request **tag_index; /* map of busy tags */ | |
227 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
228 | int busy; /* current depth */ |
229 | int max_depth; /* what we will send to device */ | |
ba025082 | 230 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
231 | atomic_t refcnt; /* map can be shared */ |
232 | }; | |
233 | ||
abf54393 FT |
234 | #define BLK_SCSI_MAX_CMDS (256) |
235 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
236 | ||
025146e1 MP |
237 | struct queue_limits { |
238 | unsigned long bounce_pfn; | |
239 | unsigned long seg_boundary_mask; | |
240 | ||
241 | unsigned int max_hw_sectors; | |
242 | unsigned int max_sectors; | |
243 | unsigned int max_segment_size; | |
c72758f3 MP |
244 | unsigned int physical_block_size; |
245 | unsigned int alignment_offset; | |
246 | unsigned int io_min; | |
247 | unsigned int io_opt; | |
67efc925 | 248 | unsigned int max_discard_sectors; |
86b37281 MP |
249 | unsigned int discard_granularity; |
250 | unsigned int discard_alignment; | |
025146e1 MP |
251 | |
252 | unsigned short logical_block_size; | |
8a78362c | 253 | unsigned short max_segments; |
13f05c8d | 254 | unsigned short max_integrity_segments; |
025146e1 | 255 | |
c72758f3 | 256 | unsigned char misaligned; |
86b37281 | 257 | unsigned char discard_misaligned; |
e692cb66 | 258 | unsigned char cluster; |
98262f27 | 259 | signed char discard_zeroes_data; |
025146e1 MP |
260 | }; |
261 | ||
1da177e4 LT |
262 | struct request_queue |
263 | { | |
264 | /* | |
265 | * Together with queue_head for cacheline sharing | |
266 | */ | |
267 | struct list_head queue_head; | |
268 | struct request *last_merge; | |
b374d18a | 269 | struct elevator_queue *elevator; |
1da177e4 LT |
270 | |
271 | /* | |
272 | * the queue request freelist, one for reads and one for writes | |
273 | */ | |
274 | struct request_list rq; | |
275 | ||
276 | request_fn_proc *request_fn; | |
1da177e4 LT |
277 | make_request_fn *make_request_fn; |
278 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 279 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 LT |
280 | unplug_fn *unplug_fn; |
281 | merge_bvec_fn *merge_bvec_fn; | |
ff856bad | 282 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 283 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 284 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 285 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 286 | |
8922e16c TH |
287 | /* |
288 | * Dispatch queue sorting | |
289 | */ | |
1b47f531 | 290 | sector_t end_sector; |
8922e16c | 291 | struct request *boundary_rq; |
8922e16c | 292 | |
1da177e4 LT |
293 | /* |
294 | * Auto-unplugging state | |
295 | */ | |
296 | struct timer_list unplug_timer; | |
297 | int unplug_thresh; /* After this many requests */ | |
298 | unsigned long unplug_delay; /* After this many jiffies */ | |
299 | struct work_struct unplug_work; | |
300 | ||
301 | struct backing_dev_info backing_dev_info; | |
302 | ||
303 | /* | |
304 | * The queue owner gets to use this for whatever they like. | |
305 | * ll_rw_blk doesn't touch it. | |
306 | */ | |
307 | void *queuedata; | |
308 | ||
1da177e4 LT |
309 | /* |
310 | * queue needs bounce pages for pages above this limit | |
311 | */ | |
8267e268 | 312 | gfp_t bounce_gfp; |
1da177e4 LT |
313 | |
314 | /* | |
315 | * various queue flags, see QUEUE_* below | |
316 | */ | |
317 | unsigned long queue_flags; | |
318 | ||
319 | /* | |
152587de JA |
320 | * protects queue structures from reentrancy. ->__queue_lock should |
321 | * _never_ be used directly, it is queue private. always use | |
322 | * ->queue_lock. | |
1da177e4 | 323 | */ |
152587de | 324 | spinlock_t __queue_lock; |
1da177e4 LT |
325 | spinlock_t *queue_lock; |
326 | ||
327 | /* | |
328 | * queue kobject | |
329 | */ | |
330 | struct kobject kobj; | |
331 | ||
332 | /* | |
333 | * queue settings | |
334 | */ | |
335 | unsigned long nr_requests; /* Max # of requests */ | |
336 | unsigned int nr_congestion_on; | |
337 | unsigned int nr_congestion_off; | |
338 | unsigned int nr_batching; | |
339 | ||
fa0ccd83 JB |
340 | void *dma_drain_buffer; |
341 | unsigned int dma_drain_size; | |
e3790c7d | 342 | unsigned int dma_pad_mask; |
1da177e4 LT |
343 | unsigned int dma_alignment; |
344 | ||
345 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 346 | struct list_head tag_busy_list; |
1da177e4 | 347 | |
15853af9 | 348 | unsigned int nr_sorted; |
0a7ae2ff | 349 | unsigned int in_flight[2]; |
1da177e4 | 350 | |
242f9dcb JA |
351 | unsigned int rq_timeout; |
352 | struct timer_list timeout; | |
353 | struct list_head timeout_list; | |
354 | ||
025146e1 MP |
355 | struct queue_limits limits; |
356 | ||
1da177e4 LT |
357 | /* |
358 | * sg stuff | |
359 | */ | |
360 | unsigned int sg_timeout; | |
361 | unsigned int sg_reserved_size; | |
1946089a | 362 | int node; |
6c5c9341 | 363 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 364 | struct blk_trace *blk_trace; |
6c5c9341 | 365 | #endif |
1da177e4 | 366 | /* |
4913efe4 | 367 | * for flush operations |
1da177e4 | 368 | */ |
4913efe4 | 369 | unsigned int flush_flags; |
ae1b1539 TH |
370 | unsigned int flush_pending_idx:1; |
371 | unsigned int flush_running_idx:1; | |
372 | unsigned long flush_pending_since; | |
373 | struct list_head flush_queue[2]; | |
374 | struct list_head flush_data_in_flight; | |
dd4c133f | 375 | struct request flush_rq; |
483f4afc AV |
376 | |
377 | struct mutex sysfs_lock; | |
d351af01 FT |
378 | |
379 | #if defined(CONFIG_BLK_DEV_BSG) | |
380 | struct bsg_class_device bsg_dev; | |
381 | #endif | |
e43473b7 VG |
382 | |
383 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
384 | /* Throttle data */ | |
385 | struct throtl_data *td; | |
386 | #endif | |
1da177e4 LT |
387 | }; |
388 | ||
1da177e4 LT |
389 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
390 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
391 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
392 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
393 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
394 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
395 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 396 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 397 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 398 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 399 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 400 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 401 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 402 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 403 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 404 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 405 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 406 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 407 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
8d57a98c | 408 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
bc58ba94 JA |
409 | |
410 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 411 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
412 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
413 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 414 | |
8f45c1a5 LT |
415 | static inline int queue_is_locked(struct request_queue *q) |
416 | { | |
7663c1e2 | 417 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
418 | spinlock_t *lock = q->queue_lock; |
419 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
420 | #else |
421 | return 1; | |
422 | #endif | |
8f45c1a5 LT |
423 | } |
424 | ||
75ad23bc NP |
425 | static inline void queue_flag_set_unlocked(unsigned int flag, |
426 | struct request_queue *q) | |
427 | { | |
428 | __set_bit(flag, &q->queue_flags); | |
429 | } | |
430 | ||
e48ec690 JA |
431 | static inline int queue_flag_test_and_clear(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 | __clear_bit(flag, &q->queue_flags); | |
438 | return 1; | |
439 | } | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
444 | static inline int queue_flag_test_and_set(unsigned int flag, | |
445 | struct request_queue *q) | |
446 | { | |
447 | WARN_ON_ONCE(!queue_is_locked(q)); | |
448 | ||
449 | if (!test_bit(flag, &q->queue_flags)) { | |
450 | __set_bit(flag, &q->queue_flags); | |
451 | return 0; | |
452 | } | |
453 | ||
454 | return 1; | |
455 | } | |
456 | ||
75ad23bc NP |
457 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
458 | { | |
8f45c1a5 | 459 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
460 | __set_bit(flag, &q->queue_flags); |
461 | } | |
462 | ||
463 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
464 | struct request_queue *q) | |
465 | { | |
466 | __clear_bit(flag, &q->queue_flags); | |
467 | } | |
468 | ||
0a7ae2ff JA |
469 | static inline int queue_in_flight(struct request_queue *q) |
470 | { | |
471 | return q->in_flight[0] + q->in_flight[1]; | |
472 | } | |
473 | ||
75ad23bc NP |
474 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
475 | { | |
8f45c1a5 | 476 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
477 | __clear_bit(flag, &q->queue_flags); |
478 | } | |
479 | ||
1da177e4 LT |
480 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) |
481 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
482 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 483 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
484 | #define blk_queue_noxmerges(q) \ |
485 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 486 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 487 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 488 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
489 | #define blk_queue_stackable(q) \ |
490 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 491 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
492 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
493 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 494 | |
33659ebb CH |
495 | #define blk_noretry_request(rq) \ |
496 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
497 | REQ_FAILFAST_DRIVER)) | |
498 | ||
499 | #define blk_account_rq(rq) \ | |
500 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
501 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
502 | ((rq)->cmd_flags & REQ_DISCARD))) | |
503 | ||
1da177e4 | 504 | #define blk_pm_request(rq) \ |
33659ebb CH |
505 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
506 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 507 | |
ab780f1e | 508 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 509 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
510 | /* rq->queuelist of dequeued request must be list_empty() */ |
511 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
512 | |
513 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
514 | ||
4aff5e23 | 515 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 516 | |
e692cb66 MP |
517 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
518 | { | |
519 | return q->limits.cluster; | |
520 | } | |
521 | ||
9e2585a8 | 522 | /* |
1faa16d2 | 523 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 524 | */ |
1faa16d2 JA |
525 | static inline bool rw_is_sync(unsigned int rw_flags) |
526 | { | |
7b6d91da | 527 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
528 | } |
529 | ||
530 | static inline bool rq_is_sync(struct request *rq) | |
531 | { | |
532 | return rw_is_sync(rq->cmd_flags); | |
533 | } | |
534 | ||
1faa16d2 | 535 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 536 | { |
1faa16d2 JA |
537 | if (sync) |
538 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
539 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
540 | } |
541 | ||
1faa16d2 | 542 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 543 | { |
1faa16d2 JA |
544 | if (sync) |
545 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 546 | else |
1faa16d2 | 547 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
548 | } |
549 | ||
1faa16d2 | 550 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 551 | { |
1faa16d2 JA |
552 | if (sync) |
553 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 554 | else |
1faa16d2 | 555 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
556 | } |
557 | ||
558 | ||
559 | /* | |
560 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
561 | * it already be started by driver. | |
562 | */ | |
563 | #define RQ_NOMERGE_FLAGS \ | |
02e031cb | 564 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) |
1da177e4 | 565 | #define rq_mergeable(rq) \ |
e17fc0a1 | 566 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
567 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
568 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 569 | |
1da177e4 LT |
570 | /* |
571 | * q->prep_rq_fn return values | |
572 | */ | |
573 | #define BLKPREP_OK 0 /* serve it */ | |
574 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
575 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
576 | ||
577 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
578 | ||
579 | /* | |
580 | * standard bounce addresses: | |
581 | * | |
582 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
583 | * BLK_BOUNCE_ANY : don't bounce anything | |
584 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
585 | */ | |
2472892a AK |
586 | |
587 | #if BITS_PER_LONG == 32 | |
1da177e4 | 588 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
589 | #else |
590 | #define BLK_BOUNCE_HIGH -1ULL | |
591 | #endif | |
592 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 593 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 594 | |
3d6392cf JA |
595 | /* |
596 | * default timeout for SG_IO if none specified | |
597 | */ | |
598 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 599 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 600 | |
2a7326b5 | 601 | #ifdef CONFIG_BOUNCE |
1da177e4 | 602 | extern int init_emergency_isa_pool(void); |
165125e1 | 603 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
604 | #else |
605 | static inline int init_emergency_isa_pool(void) | |
606 | { | |
607 | return 0; | |
608 | } | |
165125e1 | 609 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
610 | { |
611 | } | |
612 | #endif /* CONFIG_MMU */ | |
613 | ||
152e283f FT |
614 | struct rq_map_data { |
615 | struct page **pages; | |
616 | int page_order; | |
617 | int nr_entries; | |
56c451f4 | 618 | unsigned long offset; |
97ae77a1 | 619 | int null_mapped; |
ecb554a8 | 620 | int from_user; |
152e283f FT |
621 | }; |
622 | ||
5705f702 N |
623 | struct req_iterator { |
624 | int i; | |
625 | struct bio *bio; | |
626 | }; | |
627 | ||
628 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
629 | #define for_each_bio(_bio) \ |
630 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 631 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
632 | if ((rq->bio)) \ |
633 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
634 | ||
5705f702 N |
635 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
636 | __rq_for_each_bio(_iter.bio, _rq) \ | |
637 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
638 | ||
639 | #define rq_iter_last(rq, _iter) \ | |
640 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
641 | ||
2d4dc890 IL |
642 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
643 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
644 | #endif | |
645 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
646 | extern void rq_flush_dcache_pages(struct request *rq); | |
647 | #else | |
648 | static inline void rq_flush_dcache_pages(struct request *rq) | |
649 | { | |
650 | } | |
651 | #endif | |
652 | ||
1da177e4 LT |
653 | extern int blk_register_queue(struct gendisk *disk); |
654 | extern void blk_unregister_queue(struct gendisk *disk); | |
655 | extern void register_disk(struct gendisk *dev); | |
656 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 657 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 658 | extern void blk_put_request(struct request *); |
165125e1 | 659 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 660 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
661 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
662 | gfp_t); | |
165125e1 JA |
663 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
664 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
66ac0280 CH |
665 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
666 | unsigned int len); | |
82124d60 | 667 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 668 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
669 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
670 | struct bio_set *bs, gfp_t gfp_mask, | |
671 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
672 | void *data); | |
673 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
674 | extern int blk_insert_cloned_request(struct request_queue *q, |
675 | struct request *rq); | |
165125e1 | 676 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 677 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
678 | extern int blk_remove_plug(struct request_queue *); |
679 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
680 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
681 | unsigned int, void __user *); | |
e915e872 AV |
682 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
683 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
684 | |
685 | /* | |
686 | * A queue has just exitted congestion. Note this in the global counter of | |
687 | * congested queues, and wake up anyone who was waiting for requests to be | |
688 | * put back. | |
689 | */ | |
8aa7e847 | 690 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 691 | { |
8aa7e847 | 692 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
693 | } |
694 | ||
695 | /* | |
696 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
697 | * state flags and increment the global gounter of congested queues. | |
698 | */ | |
8aa7e847 | 699 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 700 | { |
8aa7e847 | 701 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
702 | } |
703 | ||
165125e1 JA |
704 | extern void blk_start_queue(struct request_queue *q); |
705 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 706 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 707 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 708 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 709 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 710 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
711 | struct rq_map_data *, void __user *, unsigned long, |
712 | gfp_t); | |
8e5cfc45 | 713 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
714 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
715 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
716 | struct rq_map_data *, struct sg_iovec *, int, |
717 | unsigned int, gfp_t); | |
165125e1 | 718 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 719 | struct request *, int); |
165125e1 | 720 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 721 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 722 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 723 | |
165125e1 | 724 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
725 | { |
726 | return bdev->bd_disk->queue; | |
727 | } | |
728 | ||
5efccd17 | 729 | /* |
80a761fd TH |
730 | * blk_rq_pos() : the current sector |
731 | * blk_rq_bytes() : bytes left in the entire request | |
732 | * blk_rq_cur_bytes() : bytes left in the current segment | |
733 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
734 | * blk_rq_sectors() : sectors left in the entire request | |
735 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 736 | */ |
5b93629b TH |
737 | static inline sector_t blk_rq_pos(const struct request *rq) |
738 | { | |
a2dec7b3 | 739 | return rq->__sector; |
2e46e8b2 TH |
740 | } |
741 | ||
742 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
743 | { | |
a2dec7b3 | 744 | return rq->__data_len; |
5b93629b TH |
745 | } |
746 | ||
2e46e8b2 TH |
747 | static inline int blk_rq_cur_bytes(const struct request *rq) |
748 | { | |
749 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
750 | } | |
5efccd17 | 751 | |
80a761fd TH |
752 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
753 | ||
5b93629b TH |
754 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
755 | { | |
2e46e8b2 | 756 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
757 | } |
758 | ||
759 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
760 | { | |
2e46e8b2 | 761 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
762 | } |
763 | ||
9934c8c0 TH |
764 | /* |
765 | * Request issue related functions. | |
766 | */ | |
767 | extern struct request *blk_peek_request(struct request_queue *q); | |
768 | extern void blk_start_request(struct request *rq); | |
769 | extern struct request *blk_fetch_request(struct request_queue *q); | |
770 | ||
1da177e4 | 771 | /* |
2e60e022 TH |
772 | * Request completion related functions. |
773 | * | |
774 | * blk_update_request() completes given number of bytes and updates | |
775 | * the request without completing it. | |
776 | * | |
f06d9a2b TH |
777 | * blk_end_request() and friends. __blk_end_request() must be called |
778 | * with the request queue spinlock acquired. | |
1da177e4 LT |
779 | * |
780 | * Several drivers define their own end_request and call | |
3bcddeac KU |
781 | * blk_end_request() for parts of the original function. |
782 | * This prevents code duplication in drivers. | |
1da177e4 | 783 | */ |
2e60e022 TH |
784 | extern bool blk_update_request(struct request *rq, int error, |
785 | unsigned int nr_bytes); | |
b1f74493 FT |
786 | extern bool blk_end_request(struct request *rq, int error, |
787 | unsigned int nr_bytes); | |
788 | extern void blk_end_request_all(struct request *rq, int error); | |
789 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 790 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
791 | extern bool __blk_end_request(struct request *rq, int error, |
792 | unsigned int nr_bytes); | |
793 | extern void __blk_end_request_all(struct request *rq, int error); | |
794 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 795 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 796 | |
ff856bad | 797 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
798 | extern void __blk_complete_request(struct request *); |
799 | extern void blk_abort_request(struct request *); | |
11914a53 | 800 | extern void blk_abort_queue(struct request_queue *); |
28018c24 | 801 | extern void blk_unprep_request(struct request *); |
ff856bad | 802 | |
1da177e4 LT |
803 | /* |
804 | * Access functions for manipulating queue properties | |
805 | */ | |
165125e1 | 806 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 807 | spinlock_t *lock, int node_id); |
01effb0d MS |
808 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
809 | request_fn_proc *, | |
810 | spinlock_t *, int node_id); | |
165125e1 | 811 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
812 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
813 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
814 | extern void blk_cleanup_queue(struct request_queue *); |
815 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
816 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 817 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 818 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 819 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 820 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
821 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
822 | unsigned int max_discard_sectors); | |
e1defc4f | 823 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 824 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
825 | extern void blk_queue_alignment_offset(struct request_queue *q, |
826 | unsigned int alignment); | |
7c958e32 | 827 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 828 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 829 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 830 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 831 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
832 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
833 | sector_t offset); | |
17be8c24 MP |
834 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
835 | sector_t offset); | |
c72758f3 MP |
836 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
837 | sector_t offset); | |
165125e1 | 838 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 839 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 840 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
841 | extern int blk_queue_dma_drain(struct request_queue *q, |
842 | dma_drain_needed_fn *dma_drain_needed, | |
843 | void *buf, unsigned int size); | |
ef9e3fac | 844 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
845 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
846 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 847 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
848 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
849 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 850 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 851 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
852 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
853 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 854 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
1da177e4 | 855 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 856 | |
165125e1 | 857 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 858 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 859 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 860 | extern long nr_blockdev_pages(void); |
1da177e4 | 861 | |
165125e1 JA |
862 | int blk_get_queue(struct request_queue *); |
863 | struct request_queue *blk_alloc_queue(gfp_t); | |
864 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
865 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
866 | |
867 | /* | |
868 | * tag stuff | |
869 | */ | |
4aff5e23 | 870 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
871 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
872 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
873 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
874 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
875 | extern void blk_queue_free_tags(struct request_queue *); | |
876 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
877 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
878 | extern struct blk_queue_tag *blk_init_tags(int); |
879 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 880 | |
f583f492 DS |
881 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
882 | int tag) | |
883 | { | |
884 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
885 | return NULL; | |
886 | return bqt->tag_index[tag]; | |
887 | } | |
dd3932ed CH |
888 | |
889 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
890 | ||
891 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
892 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
893 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 | 894 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 895 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
896 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
897 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 898 | { |
2cf6d26a CH |
899 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
900 | nr_blocks << (sb->s_blocksize_bits - 9), | |
901 | gfp_mask, flags); | |
fb2dce86 | 902 | } |
e6fa0be6 | 903 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 904 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
905 | { |
906 | return blkdev_issue_zeroout(sb->s_bdev, | |
907 | block << (sb->s_blocksize_bits - 9), | |
908 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 909 | gfp_mask); |
e6fa0be6 | 910 | } |
1da177e4 | 911 | |
018e0446 | 912 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 913 | |
eb28d31b MP |
914 | enum blk_default_limits { |
915 | BLK_MAX_SEGMENTS = 128, | |
916 | BLK_SAFE_MAX_SECTORS = 255, | |
917 | BLK_DEF_MAX_SECTORS = 1024, | |
918 | BLK_MAX_SEGMENT_SIZE = 65536, | |
919 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
920 | }; | |
0e435ac2 | 921 | |
1da177e4 LT |
922 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
923 | ||
ae03bf63 MP |
924 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
925 | { | |
025146e1 | 926 | return q->limits.bounce_pfn; |
ae03bf63 MP |
927 | } |
928 | ||
929 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
930 | { | |
025146e1 | 931 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
932 | } |
933 | ||
934 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
935 | { | |
025146e1 | 936 | return q->limits.max_sectors; |
ae03bf63 MP |
937 | } |
938 | ||
939 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
940 | { | |
025146e1 | 941 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
942 | } |
943 | ||
8a78362c | 944 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 945 | { |
8a78362c | 946 | return q->limits.max_segments; |
ae03bf63 MP |
947 | } |
948 | ||
949 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
950 | { | |
025146e1 | 951 | return q->limits.max_segment_size; |
ae03bf63 MP |
952 | } |
953 | ||
e1defc4f | 954 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
955 | { |
956 | int retval = 512; | |
957 | ||
025146e1 MP |
958 | if (q && q->limits.logical_block_size) |
959 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
960 | |
961 | return retval; | |
962 | } | |
963 | ||
e1defc4f | 964 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 965 | { |
e1defc4f | 966 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
967 | } |
968 | ||
c72758f3 MP |
969 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
970 | { | |
971 | return q->limits.physical_block_size; | |
972 | } | |
973 | ||
892b6f90 | 974 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
975 | { |
976 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
977 | } | |
978 | ||
c72758f3 MP |
979 | static inline unsigned int queue_io_min(struct request_queue *q) |
980 | { | |
981 | return q->limits.io_min; | |
982 | } | |
983 | ||
ac481c20 MP |
984 | static inline int bdev_io_min(struct block_device *bdev) |
985 | { | |
986 | return queue_io_min(bdev_get_queue(bdev)); | |
987 | } | |
988 | ||
c72758f3 MP |
989 | static inline unsigned int queue_io_opt(struct request_queue *q) |
990 | { | |
991 | return q->limits.io_opt; | |
992 | } | |
993 | ||
ac481c20 MP |
994 | static inline int bdev_io_opt(struct block_device *bdev) |
995 | { | |
996 | return queue_io_opt(bdev_get_queue(bdev)); | |
997 | } | |
998 | ||
c72758f3 MP |
999 | static inline int queue_alignment_offset(struct request_queue *q) |
1000 | { | |
ac481c20 | 1001 | if (q->limits.misaligned) |
c72758f3 MP |
1002 | return -1; |
1003 | ||
ac481c20 | 1004 | return q->limits.alignment_offset; |
c72758f3 MP |
1005 | } |
1006 | ||
e03a72e1 | 1007 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1008 | { |
1009 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1010 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1011 | |
e03a72e1 MP |
1012 | return (granularity + lim->alignment_offset - alignment) |
1013 | & (granularity - 1); | |
c72758f3 MP |
1014 | } |
1015 | ||
ac481c20 MP |
1016 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1017 | { | |
1018 | struct request_queue *q = bdev_get_queue(bdev); | |
1019 | ||
1020 | if (q->limits.misaligned) | |
1021 | return -1; | |
1022 | ||
1023 | if (bdev != bdev->bd_contains) | |
1024 | return bdev->bd_part->alignment_offset; | |
1025 | ||
1026 | return q->limits.alignment_offset; | |
1027 | } | |
1028 | ||
86b37281 MP |
1029 | static inline int queue_discard_alignment(struct request_queue *q) |
1030 | { | |
1031 | if (q->limits.discard_misaligned) | |
1032 | return -1; | |
1033 | ||
1034 | return q->limits.discard_alignment; | |
1035 | } | |
1036 | ||
e03a72e1 | 1037 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1038 | { |
dd3d145d MP |
1039 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1040 | ||
1041 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1042 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1043 | } |
1044 | ||
98262f27 MP |
1045 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1046 | { | |
1047 | if (q->limits.discard_zeroes_data == 1) | |
1048 | return 1; | |
1049 | ||
1050 | return 0; | |
1051 | } | |
1052 | ||
1053 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1054 | { | |
1055 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1056 | } | |
1057 | ||
165125e1 | 1058 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1059 | { |
482eb689 | 1060 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1061 | } |
1062 | ||
14417799 | 1063 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1064 | unsigned int len) |
1065 | { | |
1066 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1067 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1068 | } |
1069 | ||
1da177e4 LT |
1070 | /* assumes size > 256 */ |
1071 | static inline unsigned int blksize_bits(unsigned int size) | |
1072 | { | |
1073 | unsigned int bits = 8; | |
1074 | do { | |
1075 | bits++; | |
1076 | size >>= 1; | |
1077 | } while (size > 256); | |
1078 | return bits; | |
1079 | } | |
1080 | ||
2befb9e3 | 1081 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1082 | { |
1083 | return bdev->bd_block_size; | |
1084 | } | |
1085 | ||
1086 | typedef struct {struct page *v;} Sector; | |
1087 | ||
1088 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1089 | ||
1090 | static inline void put_dev_sector(Sector p) | |
1091 | { | |
1092 | page_cache_release(p.v); | |
1093 | } | |
1094 | ||
1095 | struct work_struct; | |
18887ad9 | 1096 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
e43473b7 | 1097 | int kblockd_schedule_delayed_work(struct request_queue *q, struct delayed_work *dwork, unsigned long delay); |
1da177e4 | 1098 | |
9195291e | 1099 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1100 | /* |
1101 | * This should not be using sched_clock(). A real patch is in progress | |
1102 | * to fix this up, until that is in place we need to disable preemption | |
1103 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1104 | */ | |
9195291e DS |
1105 | static inline void set_start_time_ns(struct request *req) |
1106 | { | |
28f4197e | 1107 | preempt_disable(); |
9195291e | 1108 | req->start_time_ns = sched_clock(); |
28f4197e | 1109 | preempt_enable(); |
9195291e DS |
1110 | } |
1111 | ||
1112 | static inline void set_io_start_time_ns(struct request *req) | |
1113 | { | |
28f4197e | 1114 | preempt_disable(); |
9195291e | 1115 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1116 | preempt_enable(); |
9195291e | 1117 | } |
84c124da DS |
1118 | |
1119 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1120 | { | |
1121 | return req->start_time_ns; | |
1122 | } | |
1123 | ||
1124 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1125 | { | |
1126 | return req->io_start_time_ns; | |
1127 | } | |
9195291e DS |
1128 | #else |
1129 | static inline void set_start_time_ns(struct request *req) {} | |
1130 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1131 | static inline uint64_t rq_start_time_ns(struct request *req) |
1132 | { | |
1133 | return 0; | |
1134 | } | |
1135 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1136 | { | |
1137 | return 0; | |
1138 | } | |
9195291e DS |
1139 | #endif |
1140 | ||
e43473b7 VG |
1141 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1142 | extern int blk_throtl_init(struct request_queue *q); | |
1143 | extern void blk_throtl_exit(struct request_queue *q); | |
1144 | extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); | |
1145 | extern void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay); | |
1146 | extern void throtl_shutdown_timer_wq(struct request_queue *q); | |
1147 | #else /* CONFIG_BLK_DEV_THROTTLING */ | |
1148 | static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) | |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | ||
1153 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } | |
1154 | static inline int blk_throtl_exit(struct request_queue *q) { return 0; } | |
1155 | static inline void throtl_schedule_delayed_work(struct request_queue *q, unsigned long delay) {} | |
1156 | static inline void throtl_shutdown_timer_wq(struct request_queue *q) {} | |
1157 | #endif /* CONFIG_BLK_DEV_THROTTLING */ | |
1158 | ||
1da177e4 LT |
1159 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1160 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1161 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1162 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1163 | ||
7ba1ba12 MP |
1164 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1165 | ||
b24498d4 JA |
1166 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1167 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1168 | |
1169 | struct blk_integrity_exchg { | |
1170 | void *prot_buf; | |
1171 | void *data_buf; | |
1172 | sector_t sector; | |
1173 | unsigned int data_size; | |
1174 | unsigned short sector_size; | |
1175 | const char *disk_name; | |
1176 | }; | |
1177 | ||
1178 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1179 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1180 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1181 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1182 | ||
1183 | struct blk_integrity { | |
1184 | integrity_gen_fn *generate_fn; | |
1185 | integrity_vrfy_fn *verify_fn; | |
1186 | integrity_set_tag_fn *set_tag_fn; | |
1187 | integrity_get_tag_fn *get_tag_fn; | |
1188 | ||
1189 | unsigned short flags; | |
1190 | unsigned short tuple_size; | |
1191 | unsigned short sector_size; | |
1192 | unsigned short tag_size; | |
1193 | ||
1194 | const char *name; | |
1195 | ||
1196 | struct kobject kobj; | |
1197 | }; | |
1198 | ||
1199 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1200 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1201 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1202 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1203 | struct scatterlist *); | |
1204 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1205 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1206 | struct request *); | |
1207 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1208 | struct bio *); | |
7ba1ba12 | 1209 | |
b04accc4 JA |
1210 | static inline |
1211 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1212 | { | |
1213 | return bdev->bd_disk->integrity; | |
1214 | } | |
1215 | ||
b02739b0 MP |
1216 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1217 | { | |
1218 | return disk->integrity; | |
1219 | } | |
1220 | ||
7ba1ba12 MP |
1221 | static inline int blk_integrity_rq(struct request *rq) |
1222 | { | |
d442cc44 MP |
1223 | if (rq->bio == NULL) |
1224 | return 0; | |
1225 | ||
7ba1ba12 MP |
1226 | return bio_integrity(rq->bio); |
1227 | } | |
1228 | ||
13f05c8d MP |
1229 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1230 | unsigned int segs) | |
1231 | { | |
1232 | q->limits.max_integrity_segments = segs; | |
1233 | } | |
1234 | ||
1235 | static inline unsigned short | |
1236 | queue_max_integrity_segments(struct request_queue *q) | |
1237 | { | |
1238 | return q->limits.max_integrity_segments; | |
1239 | } | |
1240 | ||
7ba1ba12 MP |
1241 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1242 | ||
1243 | #define blk_integrity_rq(rq) (0) | |
13f05c8d MP |
1244 | #define blk_rq_count_integrity_sg(a, b) (0) |
1245 | #define blk_rq_map_integrity_sg(a, b, c) (0) | |
b04accc4 | 1246 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1247 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1248 | #define blk_integrity_compare(a, b) (0) |
1249 | #define blk_integrity_register(a, b) (0) | |
1250 | #define blk_integrity_unregister(a) do { } while (0); | |
13f05c8d MP |
1251 | #define blk_queue_max_integrity_segments(a, b) do { } while (0); |
1252 | #define queue_max_integrity_segments(a) (0) | |
1253 | #define blk_integrity_merge_rq(a, b, c) (0) | |
1254 | #define blk_integrity_merge_bio(a, b, c) (0) | |
7ba1ba12 MP |
1255 | |
1256 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1257 | ||
08f85851 | 1258 | struct block_device_operations { |
d4430d62 AV |
1259 | int (*open) (struct block_device *, fmode_t); |
1260 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1261 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1262 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1263 | int (*direct_access) (struct block_device *, sector_t, |
1264 | void **, unsigned long *); | |
1265 | int (*media_changed) (struct gendisk *); | |
c3e33e04 | 1266 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1267 | int (*revalidate_disk) (struct gendisk *); |
1268 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1269 | /* this callback is with swap_lock and sometimes page table lock held */ |
1270 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1271 | struct module *owner; |
1272 | }; | |
1273 | ||
633a08b8 AV |
1274 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1275 | unsigned long); | |
9361401e DH |
1276 | #else /* CONFIG_BLOCK */ |
1277 | /* | |
1278 | * stubs for when the block layer is configured out | |
1279 | */ | |
1280 | #define buffer_heads_over_limit 0 | |
1281 | ||
9361401e DH |
1282 | static inline long nr_blockdev_pages(void) |
1283 | { | |
1284 | return 0; | |
1285 | } | |
1286 | ||
9361401e DH |
1287 | #endif /* CONFIG_BLOCK */ |
1288 | ||
1da177e4 | 1289 | #endif |