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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 JA |
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 LT |
357 | /* |
358 | * reserved for flush operations | |
359 | */ | |
797e7dbb TH |
360 | unsigned int ordered, next_ordered, ordseq; |
361 | int orderr, ordcolor; | |
362 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
363 | struct request *orig_bar_rq; | |
483f4afc AV |
364 | |
365 | struct mutex sysfs_lock; | |
d351af01 FT |
366 | |
367 | #if defined(CONFIG_BLK_DEV_BSG) | |
368 | struct bsg_class_device bsg_dev; | |
369 | #endif | |
1da177e4 LT |
370 | }; |
371 | ||
1da177e4 LT |
372 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
373 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
374 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
375 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
376 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
377 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
378 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
379 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 380 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 381 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 382 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 383 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 384 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 385 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 386 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 387 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 388 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 389 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 390 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 391 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
8d57a98c | 392 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
bc58ba94 JA |
393 | |
394 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
395 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
01e97f6b | 396 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
397 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
398 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 399 | |
8f45c1a5 LT |
400 | static inline int queue_is_locked(struct request_queue *q) |
401 | { | |
7663c1e2 | 402 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
403 | spinlock_t *lock = q->queue_lock; |
404 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
405 | #else |
406 | return 1; | |
407 | #endif | |
8f45c1a5 LT |
408 | } |
409 | ||
75ad23bc NP |
410 | static inline void queue_flag_set_unlocked(unsigned int flag, |
411 | struct request_queue *q) | |
412 | { | |
413 | __set_bit(flag, &q->queue_flags); | |
414 | } | |
415 | ||
e48ec690 JA |
416 | static inline int queue_flag_test_and_clear(unsigned int flag, |
417 | struct request_queue *q) | |
418 | { | |
419 | WARN_ON_ONCE(!queue_is_locked(q)); | |
420 | ||
421 | if (test_bit(flag, &q->queue_flags)) { | |
422 | __clear_bit(flag, &q->queue_flags); | |
423 | return 1; | |
424 | } | |
425 | ||
426 | return 0; | |
427 | } | |
428 | ||
429 | static inline int queue_flag_test_and_set(unsigned int flag, | |
430 | struct request_queue *q) | |
431 | { | |
432 | WARN_ON_ONCE(!queue_is_locked(q)); | |
433 | ||
434 | if (!test_bit(flag, &q->queue_flags)) { | |
435 | __set_bit(flag, &q->queue_flags); | |
436 | return 0; | |
437 | } | |
438 | ||
439 | return 1; | |
440 | } | |
441 | ||
75ad23bc NP |
442 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
443 | { | |
8f45c1a5 | 444 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
445 | __set_bit(flag, &q->queue_flags); |
446 | } | |
447 | ||
448 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
449 | struct request_queue *q) | |
450 | { | |
451 | __clear_bit(flag, &q->queue_flags); | |
452 | } | |
453 | ||
0a7ae2ff JA |
454 | static inline int queue_in_flight(struct request_queue *q) |
455 | { | |
456 | return q->in_flight[0] + q->in_flight[1]; | |
457 | } | |
458 | ||
75ad23bc NP |
459 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
460 | { | |
8f45c1a5 | 461 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
462 | __clear_bit(flag, &q->queue_flags); |
463 | } | |
464 | ||
797e7dbb TH |
465 | enum { |
466 | /* | |
467 | * Hardbarrier is supported with one of the following methods. | |
468 | * | |
469 | * NONE : hardbarrier unsupported | |
470 | * DRAIN : ordering by draining is enough | |
471 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
472 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
797e7dbb | 473 | */ |
313e4299 | 474 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, |
f671620e | 475 | QUEUE_ORDERED_DO_BAR = 0x20, |
313e4299 TH |
476 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
477 | QUEUE_ORDERED_DO_FUA = 0x80, | |
478 | ||
479 | QUEUE_ORDERED_NONE = 0x00, | |
480 | ||
6958f145 | 481 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_DO_BAR, |
313e4299 TH |
482 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
483 | QUEUE_ORDERED_DO_PREFLUSH | | |
484 | QUEUE_ORDERED_DO_POSTFLUSH, | |
485 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
486 | QUEUE_ORDERED_DO_PREFLUSH | | |
487 | QUEUE_ORDERED_DO_FUA, | |
488 | ||
797e7dbb TH |
489 | /* |
490 | * Ordered operation sequence | |
491 | */ | |
492 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
493 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
494 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
495 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
496 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
497 | QUEUE_ORDSEQ_DONE = 0x20, | |
498 | }; | |
1da177e4 LT |
499 | |
500 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
501 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
502 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 503 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
504 | #define blk_queue_noxmerges(q) \ |
505 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 506 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 507 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 508 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
509 | #define blk_queue_stackable(q) \ |
510 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 511 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
512 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
513 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 514 | |
33659ebb CH |
515 | #define blk_noretry_request(rq) \ |
516 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
517 | REQ_FAILFAST_DRIVER)) | |
518 | ||
519 | #define blk_account_rq(rq) \ | |
520 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
521 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
522 | ((rq)->cmd_flags & REQ_DISCARD))) | |
523 | ||
1da177e4 | 524 | #define blk_pm_request(rq) \ |
33659ebb CH |
525 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
526 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 527 | |
ab780f1e | 528 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 529 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
530 | /* rq->queuelist of dequeued request must be list_empty() */ |
531 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
532 | |
533 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
534 | ||
4aff5e23 | 535 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 536 | |
9e2585a8 | 537 | /* |
1faa16d2 | 538 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 539 | */ |
1faa16d2 JA |
540 | static inline bool rw_is_sync(unsigned int rw_flags) |
541 | { | |
7b6d91da | 542 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
543 | } |
544 | ||
545 | static inline bool rq_is_sync(struct request *rq) | |
546 | { | |
547 | return rw_is_sync(rq->cmd_flags); | |
548 | } | |
549 | ||
1faa16d2 | 550 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 551 | { |
1faa16d2 JA |
552 | if (sync) |
553 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
554 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
555 | } |
556 | ||
1faa16d2 | 557 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 558 | { |
1faa16d2 JA |
559 | if (sync) |
560 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 561 | else |
1faa16d2 | 562 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
563 | } |
564 | ||
1faa16d2 | 565 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 566 | { |
1faa16d2 JA |
567 | if (sync) |
568 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 569 | else |
1faa16d2 | 570 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
571 | } |
572 | ||
573 | ||
574 | /* | |
575 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
576 | * it already be started by driver. | |
577 | */ | |
578 | #define RQ_NOMERGE_FLAGS \ | |
579 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
580 | #define rq_mergeable(rq) \ | |
e17fc0a1 | 581 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
582 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
583 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 584 | |
1da177e4 LT |
585 | /* |
586 | * q->prep_rq_fn return values | |
587 | */ | |
588 | #define BLKPREP_OK 0 /* serve it */ | |
589 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
590 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
591 | ||
592 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
593 | ||
594 | /* | |
595 | * standard bounce addresses: | |
596 | * | |
597 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
598 | * BLK_BOUNCE_ANY : don't bounce anything | |
599 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
600 | */ | |
2472892a AK |
601 | |
602 | #if BITS_PER_LONG == 32 | |
1da177e4 | 603 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
604 | #else |
605 | #define BLK_BOUNCE_HIGH -1ULL | |
606 | #endif | |
607 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 608 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 609 | |
3d6392cf JA |
610 | /* |
611 | * default timeout for SG_IO if none specified | |
612 | */ | |
613 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 614 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 615 | |
2a7326b5 | 616 | #ifdef CONFIG_BOUNCE |
1da177e4 | 617 | extern int init_emergency_isa_pool(void); |
165125e1 | 618 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
619 | #else |
620 | static inline int init_emergency_isa_pool(void) | |
621 | { | |
622 | return 0; | |
623 | } | |
165125e1 | 624 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
625 | { |
626 | } | |
627 | #endif /* CONFIG_MMU */ | |
628 | ||
152e283f FT |
629 | struct rq_map_data { |
630 | struct page **pages; | |
631 | int page_order; | |
632 | int nr_entries; | |
56c451f4 | 633 | unsigned long offset; |
97ae77a1 | 634 | int null_mapped; |
ecb554a8 | 635 | int from_user; |
152e283f FT |
636 | }; |
637 | ||
5705f702 N |
638 | struct req_iterator { |
639 | int i; | |
640 | struct bio *bio; | |
641 | }; | |
642 | ||
643 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
644 | #define for_each_bio(_bio) \ |
645 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 646 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
647 | if ((rq->bio)) \ |
648 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
649 | ||
5705f702 N |
650 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
651 | __rq_for_each_bio(_iter.bio, _rq) \ | |
652 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
653 | ||
654 | #define rq_iter_last(rq, _iter) \ | |
655 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
656 | ||
2d4dc890 IL |
657 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
658 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
659 | #endif | |
660 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
661 | extern void rq_flush_dcache_pages(struct request *rq); | |
662 | #else | |
663 | static inline void rq_flush_dcache_pages(struct request *rq) | |
664 | { | |
665 | } | |
666 | #endif | |
667 | ||
1da177e4 LT |
668 | extern int blk_register_queue(struct gendisk *disk); |
669 | extern void blk_unregister_queue(struct gendisk *disk); | |
670 | extern void register_disk(struct gendisk *dev); | |
671 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 672 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 673 | extern void blk_put_request(struct request *); |
165125e1 | 674 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 675 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
676 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
677 | gfp_t); | |
165125e1 JA |
678 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
679 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
66ac0280 CH |
680 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
681 | unsigned int len); | |
82124d60 | 682 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 683 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
684 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
685 | struct bio_set *bs, gfp_t gfp_mask, | |
686 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
687 | void *data); | |
688 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
689 | extern int blk_insert_cloned_request(struct request_queue *q, |
690 | struct request *rq); | |
165125e1 | 691 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 692 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
693 | extern int blk_remove_plug(struct request_queue *); |
694 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
695 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
696 | unsigned int, void __user *); | |
e915e872 AV |
697 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
698 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
699 | |
700 | /* | |
701 | * A queue has just exitted congestion. Note this in the global counter of | |
702 | * congested queues, and wake up anyone who was waiting for requests to be | |
703 | * put back. | |
704 | */ | |
8aa7e847 | 705 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 706 | { |
8aa7e847 | 707 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
708 | } |
709 | ||
710 | /* | |
711 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
712 | * state flags and increment the global gounter of congested queues. | |
713 | */ | |
8aa7e847 | 714 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 715 | { |
8aa7e847 | 716 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
717 | } |
718 | ||
165125e1 JA |
719 | extern void blk_start_queue(struct request_queue *q); |
720 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 721 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 722 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 723 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 724 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 725 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
726 | struct rq_map_data *, void __user *, unsigned long, |
727 | gfp_t); | |
8e5cfc45 | 728 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
729 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
730 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
731 | struct rq_map_data *, struct sg_iovec *, int, |
732 | unsigned int, gfp_t); | |
165125e1 | 733 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 734 | struct request *, int); |
165125e1 | 735 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 736 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 737 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 738 | |
165125e1 | 739 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
740 | { |
741 | return bdev->bd_disk->queue; | |
742 | } | |
743 | ||
5efccd17 | 744 | /* |
80a761fd TH |
745 | * blk_rq_pos() : the current sector |
746 | * blk_rq_bytes() : bytes left in the entire request | |
747 | * blk_rq_cur_bytes() : bytes left in the current segment | |
748 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
749 | * blk_rq_sectors() : sectors left in the entire request | |
750 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 751 | */ |
5b93629b TH |
752 | static inline sector_t blk_rq_pos(const struct request *rq) |
753 | { | |
a2dec7b3 | 754 | return rq->__sector; |
2e46e8b2 TH |
755 | } |
756 | ||
757 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
758 | { | |
a2dec7b3 | 759 | return rq->__data_len; |
5b93629b TH |
760 | } |
761 | ||
2e46e8b2 TH |
762 | static inline int blk_rq_cur_bytes(const struct request *rq) |
763 | { | |
764 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
765 | } | |
5efccd17 | 766 | |
80a761fd TH |
767 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
768 | ||
5b93629b TH |
769 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
770 | { | |
2e46e8b2 | 771 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
772 | } |
773 | ||
774 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
775 | { | |
2e46e8b2 | 776 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
777 | } |
778 | ||
9934c8c0 TH |
779 | /* |
780 | * Request issue related functions. | |
781 | */ | |
782 | extern struct request *blk_peek_request(struct request_queue *q); | |
783 | extern void blk_start_request(struct request *rq); | |
784 | extern struct request *blk_fetch_request(struct request_queue *q); | |
785 | ||
1da177e4 | 786 | /* |
2e60e022 TH |
787 | * Request completion related functions. |
788 | * | |
789 | * blk_update_request() completes given number of bytes and updates | |
790 | * the request without completing it. | |
791 | * | |
f06d9a2b TH |
792 | * blk_end_request() and friends. __blk_end_request() must be called |
793 | * with the request queue spinlock acquired. | |
1da177e4 LT |
794 | * |
795 | * Several drivers define their own end_request and call | |
3bcddeac KU |
796 | * blk_end_request() for parts of the original function. |
797 | * This prevents code duplication in drivers. | |
1da177e4 | 798 | */ |
2e60e022 TH |
799 | extern bool blk_update_request(struct request *rq, int error, |
800 | unsigned int nr_bytes); | |
b1f74493 FT |
801 | extern bool blk_end_request(struct request *rq, int error, |
802 | unsigned int nr_bytes); | |
803 | extern void blk_end_request_all(struct request *rq, int error); | |
804 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 805 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
806 | extern bool __blk_end_request(struct request *rq, int error, |
807 | unsigned int nr_bytes); | |
808 | extern void __blk_end_request_all(struct request *rq, int error); | |
809 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 810 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 811 | |
ff856bad | 812 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
813 | extern void __blk_complete_request(struct request *); |
814 | extern void blk_abort_request(struct request *); | |
11914a53 | 815 | extern void blk_abort_queue(struct request_queue *); |
28018c24 | 816 | extern void blk_unprep_request(struct request *); |
ff856bad | 817 | |
1da177e4 LT |
818 | /* |
819 | * Access functions for manipulating queue properties | |
820 | */ | |
165125e1 | 821 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 822 | spinlock_t *lock, int node_id); |
01effb0d MS |
823 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
824 | request_fn_proc *, | |
825 | spinlock_t *, int node_id); | |
165125e1 | 826 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
827 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
828 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
829 | extern void blk_cleanup_queue(struct request_queue *); |
830 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
831 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 832 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 833 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 834 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
835 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
836 | unsigned int max_discard_sectors); | |
e1defc4f | 837 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
c72758f3 MP |
838 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
839 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
840 | unsigned int alignment); | |
7c958e32 | 841 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 842 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 843 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 844 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 845 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
846 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
847 | sector_t offset); | |
17be8c24 MP |
848 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
849 | sector_t offset); | |
c72758f3 MP |
850 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
851 | sector_t offset); | |
165125e1 | 852 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 853 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 854 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
855 | extern int blk_queue_dma_drain(struct request_queue *q, |
856 | dma_drain_needed_fn *dma_drain_needed, | |
857 | void *buf, unsigned int size); | |
ef9e3fac | 858 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
859 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
860 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 861 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
862 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
863 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 864 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 865 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
866 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
867 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 868 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
00fff265 | 869 | extern int blk_queue_ordered(struct request_queue *, unsigned); |
8f11b3e9 | 870 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 871 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 872 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 873 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 874 | |
165125e1 | 875 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 876 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 877 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 878 | extern long nr_blockdev_pages(void); |
1da177e4 | 879 | |
165125e1 JA |
880 | int blk_get_queue(struct request_queue *); |
881 | struct request_queue *blk_alloc_queue(gfp_t); | |
882 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
883 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
884 | |
885 | /* | |
886 | * tag stuff | |
887 | */ | |
4aff5e23 | 888 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
889 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
890 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
891 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
892 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
893 | extern void blk_queue_free_tags(struct request_queue *); | |
894 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
895 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
896 | extern struct blk_queue_tag *blk_init_tags(int); |
897 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 898 | |
f583f492 DS |
899 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
900 | int tag) | |
901 | { | |
902 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
903 | return NULL; | |
904 | return bqt->tag_index[tag]; | |
905 | } | |
fbd9b09a DM |
906 | enum{ |
907 | BLKDEV_WAIT, /* wait for completion */ | |
8d57a98c AH |
908 | BLKDEV_BARRIER, /* issue request with barrier */ |
909 | BLKDEV_SECURE, /* secure discard */ | |
fbd9b09a DM |
910 | }; |
911 | #define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) | |
912 | #define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER) | |
8d57a98c | 913 | #define BLKDEV_IFL_SECURE (1 << BLKDEV_SECURE) |
fbd9b09a DM |
914 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, |
915 | unsigned long); | |
916 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
917 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 DM |
918 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
919 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
fb2dce86 | 920 | static inline int sb_issue_discard(struct super_block *sb, |
3e6053d7 | 921 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
922 | { |
923 | block <<= (sb->s_blocksize_bits - 9); | |
924 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
edca4a38 | 925 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_NOFS, |
fbd9b09a | 926 | BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); |
fb2dce86 | 927 | } |
1da177e4 | 928 | |
018e0446 | 929 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 930 | |
eb28d31b MP |
931 | enum blk_default_limits { |
932 | BLK_MAX_SEGMENTS = 128, | |
933 | BLK_SAFE_MAX_SECTORS = 255, | |
934 | BLK_DEF_MAX_SECTORS = 1024, | |
935 | BLK_MAX_SEGMENT_SIZE = 65536, | |
936 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
937 | }; | |
0e435ac2 | 938 | |
1da177e4 LT |
939 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
940 | ||
ae03bf63 MP |
941 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
942 | { | |
025146e1 | 943 | return q->limits.bounce_pfn; |
ae03bf63 MP |
944 | } |
945 | ||
946 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
947 | { | |
025146e1 | 948 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
949 | } |
950 | ||
951 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
952 | { | |
025146e1 | 953 | return q->limits.max_sectors; |
ae03bf63 MP |
954 | } |
955 | ||
956 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
957 | { | |
025146e1 | 958 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
959 | } |
960 | ||
8a78362c | 961 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 962 | { |
8a78362c | 963 | return q->limits.max_segments; |
ae03bf63 MP |
964 | } |
965 | ||
966 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
967 | { | |
025146e1 | 968 | return q->limits.max_segment_size; |
ae03bf63 MP |
969 | } |
970 | ||
e1defc4f | 971 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
972 | { |
973 | int retval = 512; | |
974 | ||
025146e1 MP |
975 | if (q && q->limits.logical_block_size) |
976 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
977 | |
978 | return retval; | |
979 | } | |
980 | ||
e1defc4f | 981 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 982 | { |
e1defc4f | 983 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
984 | } |
985 | ||
c72758f3 MP |
986 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
987 | { | |
988 | return q->limits.physical_block_size; | |
989 | } | |
990 | ||
ac481c20 MP |
991 | static inline int bdev_physical_block_size(struct block_device *bdev) |
992 | { | |
993 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
994 | } | |
995 | ||
c72758f3 MP |
996 | static inline unsigned int queue_io_min(struct request_queue *q) |
997 | { | |
998 | return q->limits.io_min; | |
999 | } | |
1000 | ||
ac481c20 MP |
1001 | static inline int bdev_io_min(struct block_device *bdev) |
1002 | { | |
1003 | return queue_io_min(bdev_get_queue(bdev)); | |
1004 | } | |
1005 | ||
c72758f3 MP |
1006 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1007 | { | |
1008 | return q->limits.io_opt; | |
1009 | } | |
1010 | ||
ac481c20 MP |
1011 | static inline int bdev_io_opt(struct block_device *bdev) |
1012 | { | |
1013 | return queue_io_opt(bdev_get_queue(bdev)); | |
1014 | } | |
1015 | ||
c72758f3 MP |
1016 | static inline int queue_alignment_offset(struct request_queue *q) |
1017 | { | |
ac481c20 | 1018 | if (q->limits.misaligned) |
c72758f3 MP |
1019 | return -1; |
1020 | ||
ac481c20 | 1021 | return q->limits.alignment_offset; |
c72758f3 MP |
1022 | } |
1023 | ||
e03a72e1 | 1024 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1025 | { |
1026 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1027 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1028 | |
e03a72e1 MP |
1029 | return (granularity + lim->alignment_offset - alignment) |
1030 | & (granularity - 1); | |
c72758f3 MP |
1031 | } |
1032 | ||
ac481c20 MP |
1033 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1034 | { | |
1035 | struct request_queue *q = bdev_get_queue(bdev); | |
1036 | ||
1037 | if (q->limits.misaligned) | |
1038 | return -1; | |
1039 | ||
1040 | if (bdev != bdev->bd_contains) | |
1041 | return bdev->bd_part->alignment_offset; | |
1042 | ||
1043 | return q->limits.alignment_offset; | |
1044 | } | |
1045 | ||
86b37281 MP |
1046 | static inline int queue_discard_alignment(struct request_queue *q) |
1047 | { | |
1048 | if (q->limits.discard_misaligned) | |
1049 | return -1; | |
1050 | ||
1051 | return q->limits.discard_alignment; | |
1052 | } | |
1053 | ||
e03a72e1 | 1054 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1055 | { |
dd3d145d MP |
1056 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1057 | ||
1058 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1059 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1060 | } |
1061 | ||
98262f27 MP |
1062 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1063 | { | |
1064 | if (q->limits.discard_zeroes_data == 1) | |
1065 | return 1; | |
1066 | ||
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1071 | { | |
1072 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1073 | } | |
1074 | ||
165125e1 | 1075 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1076 | { |
482eb689 | 1077 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1078 | } |
1079 | ||
87904074 FT |
1080 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1081 | unsigned int len) | |
1082 | { | |
1083 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1084 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1085 | } | |
1086 | ||
1da177e4 LT |
1087 | /* assumes size > 256 */ |
1088 | static inline unsigned int blksize_bits(unsigned int size) | |
1089 | { | |
1090 | unsigned int bits = 8; | |
1091 | do { | |
1092 | bits++; | |
1093 | size >>= 1; | |
1094 | } while (size > 256); | |
1095 | return bits; | |
1096 | } | |
1097 | ||
2befb9e3 | 1098 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1099 | { |
1100 | return bdev->bd_block_size; | |
1101 | } | |
1102 | ||
1103 | typedef struct {struct page *v;} Sector; | |
1104 | ||
1105 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1106 | ||
1107 | static inline void put_dev_sector(Sector p) | |
1108 | { | |
1109 | page_cache_release(p.v); | |
1110 | } | |
1111 | ||
1112 | struct work_struct; | |
18887ad9 | 1113 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1114 | |
9195291e | 1115 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1116 | /* |
1117 | * This should not be using sched_clock(). A real patch is in progress | |
1118 | * to fix this up, until that is in place we need to disable preemption | |
1119 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1120 | */ | |
9195291e DS |
1121 | static inline void set_start_time_ns(struct request *req) |
1122 | { | |
28f4197e | 1123 | preempt_disable(); |
9195291e | 1124 | req->start_time_ns = sched_clock(); |
28f4197e | 1125 | preempt_enable(); |
9195291e DS |
1126 | } |
1127 | ||
1128 | static inline void set_io_start_time_ns(struct request *req) | |
1129 | { | |
28f4197e | 1130 | preempt_disable(); |
9195291e | 1131 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1132 | preempt_enable(); |
9195291e | 1133 | } |
84c124da DS |
1134 | |
1135 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1136 | { | |
1137 | return req->start_time_ns; | |
1138 | } | |
1139 | ||
1140 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1141 | { | |
1142 | return req->io_start_time_ns; | |
1143 | } | |
9195291e DS |
1144 | #else |
1145 | static inline void set_start_time_ns(struct request *req) {} | |
1146 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1147 | static inline uint64_t rq_start_time_ns(struct request *req) |
1148 | { | |
1149 | return 0; | |
1150 | } | |
1151 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1152 | { | |
1153 | return 0; | |
1154 | } | |
9195291e DS |
1155 | #endif |
1156 | ||
1da177e4 LT |
1157 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1158 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1159 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1160 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1161 | ||
7ba1ba12 MP |
1162 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1163 | ||
b24498d4 JA |
1164 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1165 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1166 | |
1167 | struct blk_integrity_exchg { | |
1168 | void *prot_buf; | |
1169 | void *data_buf; | |
1170 | sector_t sector; | |
1171 | unsigned int data_size; | |
1172 | unsigned short sector_size; | |
1173 | const char *disk_name; | |
1174 | }; | |
1175 | ||
1176 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1177 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1178 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1179 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1180 | ||
1181 | struct blk_integrity { | |
1182 | integrity_gen_fn *generate_fn; | |
1183 | integrity_vrfy_fn *verify_fn; | |
1184 | integrity_set_tag_fn *set_tag_fn; | |
1185 | integrity_get_tag_fn *get_tag_fn; | |
1186 | ||
1187 | unsigned short flags; | |
1188 | unsigned short tuple_size; | |
1189 | unsigned short sector_size; | |
1190 | unsigned short tag_size; | |
1191 | ||
1192 | const char *name; | |
1193 | ||
1194 | struct kobject kobj; | |
1195 | }; | |
1196 | ||
1197 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1198 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1199 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1200 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1201 | extern int blk_rq_count_integrity_sg(struct request *); | |
1202 | ||
b04accc4 JA |
1203 | static inline |
1204 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1205 | { | |
1206 | return bdev->bd_disk->integrity; | |
1207 | } | |
1208 | ||
b02739b0 MP |
1209 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1210 | { | |
1211 | return disk->integrity; | |
1212 | } | |
1213 | ||
7ba1ba12 MP |
1214 | static inline int blk_integrity_rq(struct request *rq) |
1215 | { | |
d442cc44 MP |
1216 | if (rq->bio == NULL) |
1217 | return 0; | |
1218 | ||
7ba1ba12 MP |
1219 | return bio_integrity(rq->bio); |
1220 | } | |
1221 | ||
1222 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1223 | ||
1224 | #define blk_integrity_rq(rq) (0) | |
1225 | #define blk_rq_count_integrity_sg(a) (0) | |
1226 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1227 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1228 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1229 | #define blk_integrity_compare(a, b) (0) |
1230 | #define blk_integrity_register(a, b) (0) | |
1231 | #define blk_integrity_unregister(a) do { } while (0); | |
1232 | ||
1233 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1234 | ||
08f85851 | 1235 | struct block_device_operations { |
d4430d62 AV |
1236 | int (*open) (struct block_device *, fmode_t); |
1237 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1238 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1239 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1240 | int (*direct_access) (struct block_device *, sector_t, |
1241 | void **, unsigned long *); | |
1242 | int (*media_changed) (struct gendisk *); | |
c3e33e04 | 1243 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1244 | int (*revalidate_disk) (struct gendisk *); |
1245 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1246 | /* this callback is with swap_lock and sometimes page table lock held */ |
1247 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1248 | struct module *owner; |
1249 | }; | |
1250 | ||
633a08b8 AV |
1251 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1252 | unsigned long); | |
9361401e DH |
1253 | #else /* CONFIG_BLOCK */ |
1254 | /* | |
1255 | * stubs for when the block layer is configured out | |
1256 | */ | |
1257 | #define buffer_heads_over_limit 0 | |
1258 | ||
9361401e DH |
1259 | static inline long nr_blockdev_pages(void) |
1260 | { | |
1261 | return 0; | |
1262 | } | |
1263 | ||
9361401e DH |
1264 | #endif /* CONFIG_BLOCK */ |
1265 | ||
1da177e4 | 1266 | #endif |