Commit | Line | Data |
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1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
f5ff8422 JA |
4 | #ifdef CONFIG_BLOCK |
5 | ||
bcfd8d36 | 6 | #include <linux/sched.h> |
1da177e4 LT |
7 | #include <linux/major.h> |
8 | #include <linux/genhd.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/backing-dev.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/mempool.h> | |
16 | #include <linux/bio.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/stringify.h> | |
3e6053d7 | 19 | #include <linux/gfp.h> |
d351af01 | 20 | #include <linux/bsg.h> |
c7c22e4d | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | |
23 | #include <asm/scatterlist.h> | |
24 | ||
21b2f0c8 CH |
25 | struct scsi_ioctl_command; |
26 | ||
1da177e4 | 27 | struct request_queue; |
1da177e4 | 28 | struct elevator_queue; |
1da177e4 | 29 | struct request_pm_state; |
2056a782 | 30 | struct blk_trace; |
3d6392cf JA |
31 | struct request; |
32 | struct sg_io_hdr; | |
1da177e4 LT |
33 | |
34 | #define BLKDEV_MIN_RQ 4 | |
35 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
36 | ||
1da177e4 | 37 | struct request; |
8ffdc655 | 38 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
39 | |
40 | struct request_list { | |
1faa16d2 JA |
41 | /* |
42 | * count[], starved[], and wait[] are indexed by | |
43 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
44 | */ | |
1da177e4 LT |
45 | int count[2]; |
46 | int starved[2]; | |
cb98fc8b | 47 | int elvpriv; |
1da177e4 LT |
48 | mempool_t *rq_pool; |
49 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
50 | }; |
51 | ||
4aff5e23 JA |
52 | /* |
53 | * request command types | |
54 | */ | |
55 | enum rq_cmd_type_bits { | |
56 | REQ_TYPE_FS = 1, /* fs request */ | |
57 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
58 | REQ_TYPE_SENSE, /* sense request */ | |
59 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
60 | REQ_TYPE_PM_RESUME, /* resume request */ | |
61 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 JA |
62 | REQ_TYPE_SPECIAL, /* driver defined type */ |
63 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
64 | /* | |
65 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
66 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
67 | * private REQ_LB opcodes to differentiate what type of request this is | |
68 | */ | |
4aff5e23 | 69 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 70 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
71 | }; |
72 | ||
73 | /* | |
74 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
75 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
76 | * SCSI cdb. | |
77 | * | |
78 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
79 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
80 | * | |
81 | */ | |
82 | enum { | |
4aff5e23 | 83 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
1a8e2bdd | 84 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
4aff5e23 JA |
85 | }; |
86 | ||
1da177e4 LT |
87 | #define BLK_MAX_CDB 16 |
88 | ||
89 | /* | |
63a71386 JA |
90 | * try to put the fields that are referenced together in the same cacheline. |
91 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
92 | * as well! | |
1da177e4 LT |
93 | */ |
94 | struct request { | |
ff856bad | 95 | struct list_head queuelist; |
c7c22e4d | 96 | struct call_single_data csd; |
ff856bad | 97 | |
165125e1 | 98 | struct request_queue *q; |
e6a1c874 | 99 | |
4aff5e23 JA |
100 | unsigned int cmd_flags; |
101 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 102 | unsigned long atomic_flags; |
1da177e4 | 103 | |
181fdde3 RK |
104 | int cpu; |
105 | ||
a2dec7b3 | 106 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 107 | unsigned int __data_len; /* total data len */ |
181fdde3 | 108 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
109 | |
110 | struct bio *bio; | |
111 | struct bio *biotail; | |
112 | ||
9817064b | 113 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
114 | /* |
115 | * The rb_node is only used inside the io scheduler, requests | |
116 | * are pruned when moved to the dispatch queue. So let the | |
117 | * completion_data share space with the rb_node. | |
118 | */ | |
119 | union { | |
120 | struct rb_node rb_node; /* sort/lookup */ | |
121 | void *completion_data; | |
122 | }; | |
9817064b | 123 | |
ff7d145f | 124 | /* |
7f1dc8a2 | 125 | * Three pointers are available for the IO schedulers, if they need |
ff7d145f JA |
126 | * more they have to dynamically allocate it. |
127 | */ | |
1da177e4 | 128 | void *elevator_private; |
ff7d145f | 129 | void *elevator_private2; |
7f1dc8a2 | 130 | void *elevator_private3; |
ff7d145f | 131 | |
8f34ee75 | 132 | struct gendisk *rq_disk; |
1da177e4 | 133 | unsigned long start_time; |
9195291e DS |
134 | #ifdef CONFIG_BLK_CGROUP |
135 | unsigned long long start_time_ns; | |
136 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
137 | #endif | |
1da177e4 LT |
138 | /* Number of scatter-gather DMA addr+len pairs after |
139 | * physical address coalescing is performed. | |
140 | */ | |
141 | unsigned short nr_phys_segments; | |
142 | ||
8f34ee75 JA |
143 | unsigned short ioprio; |
144 | ||
181fdde3 RK |
145 | int ref_count; |
146 | ||
731ec497 TH |
147 | void *special; /* opaque pointer available for LLD use */ |
148 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 149 | |
cdd60262 JA |
150 | int tag; |
151 | int errors; | |
152 | ||
1da177e4 LT |
153 | /* |
154 | * when request is used as a packet command carrier | |
155 | */ | |
d7e3c324 FT |
156 | unsigned char __cmd[BLK_MAX_CDB]; |
157 | unsigned char *cmd; | |
181fdde3 | 158 | unsigned short cmd_len; |
1da177e4 | 159 | |
7a85f889 | 160 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 161 | unsigned int sense_len; |
c3a4d78c | 162 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
163 | void *sense; |
164 | ||
242f9dcb JA |
165 | unsigned long deadline; |
166 | struct list_head timeout_list; | |
1da177e4 | 167 | unsigned int timeout; |
17e01f21 | 168 | int retries; |
1da177e4 | 169 | |
1da177e4 | 170 | /* |
c00895ab | 171 | * completion callback. |
1da177e4 LT |
172 | */ |
173 | rq_end_io_fn *end_io; | |
174 | void *end_io_data; | |
abae1fde FT |
175 | |
176 | /* for bidi */ | |
177 | struct request *next_rq; | |
1da177e4 LT |
178 | }; |
179 | ||
766ca442 FLVC |
180 | static inline unsigned short req_get_ioprio(struct request *req) |
181 | { | |
182 | return req->ioprio; | |
183 | } | |
184 | ||
1da177e4 | 185 | /* |
4aff5e23 | 186 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
187 | * requests. Some step values could eventually be made generic. |
188 | */ | |
189 | struct request_pm_state | |
190 | { | |
191 | /* PM state machine step value, currently driver specific */ | |
192 | int pm_step; | |
193 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
194 | u32 pm_state; | |
195 | void* data; /* for driver use */ | |
196 | }; | |
197 | ||
198 | #include <linux/elevator.h> | |
199 | ||
165125e1 JA |
200 | typedef void (request_fn_proc) (struct request_queue *q); |
201 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
202 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
203 | typedef void (unplug_fn) (struct request_queue *); | |
1da177e4 LT |
204 | |
205 | struct bio_vec; | |
cc371e66 AK |
206 | struct bvec_merge_data { |
207 | struct block_device *bi_bdev; | |
208 | sector_t bi_sector; | |
209 | unsigned bi_size; | |
210 | unsigned long bi_rw; | |
211 | }; | |
212 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
213 | struct bio_vec *); | |
165125e1 | 214 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 215 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 216 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 217 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 218 | |
242f9dcb JA |
219 | enum blk_eh_timer_return { |
220 | BLK_EH_NOT_HANDLED, | |
221 | BLK_EH_HANDLED, | |
222 | BLK_EH_RESET_TIMER, | |
223 | }; | |
224 | ||
225 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
226 | ||
1da177e4 LT |
227 | enum blk_queue_state { |
228 | Queue_down, | |
229 | Queue_up, | |
230 | }; | |
231 | ||
1da177e4 LT |
232 | struct blk_queue_tag { |
233 | struct request **tag_index; /* map of busy tags */ | |
234 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
235 | int busy; /* current depth */ |
236 | int max_depth; /* what we will send to device */ | |
ba025082 | 237 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
238 | atomic_t refcnt; /* map can be shared */ |
239 | }; | |
240 | ||
abf54393 FT |
241 | #define BLK_SCSI_MAX_CMDS (256) |
242 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
243 | ||
025146e1 MP |
244 | struct queue_limits { |
245 | unsigned long bounce_pfn; | |
246 | unsigned long seg_boundary_mask; | |
247 | ||
248 | unsigned int max_hw_sectors; | |
249 | unsigned int max_sectors; | |
250 | unsigned int max_segment_size; | |
c72758f3 MP |
251 | unsigned int physical_block_size; |
252 | unsigned int alignment_offset; | |
253 | unsigned int io_min; | |
254 | unsigned int io_opt; | |
67efc925 | 255 | unsigned int max_discard_sectors; |
86b37281 MP |
256 | unsigned int discard_granularity; |
257 | unsigned int discard_alignment; | |
025146e1 MP |
258 | |
259 | unsigned short logical_block_size; | |
8a78362c | 260 | unsigned short max_segments; |
025146e1 | 261 | |
c72758f3 | 262 | unsigned char misaligned; |
86b37281 | 263 | unsigned char discard_misaligned; |
025146e1 | 264 | unsigned char no_cluster; |
98262f27 | 265 | signed char discard_zeroes_data; |
025146e1 MP |
266 | }; |
267 | ||
1da177e4 LT |
268 | struct request_queue |
269 | { | |
270 | /* | |
271 | * Together with queue_head for cacheline sharing | |
272 | */ | |
273 | struct list_head queue_head; | |
274 | struct request *last_merge; | |
b374d18a | 275 | struct elevator_queue *elevator; |
1da177e4 LT |
276 | |
277 | /* | |
278 | * the queue request freelist, one for reads and one for writes | |
279 | */ | |
280 | struct request_list rq; | |
281 | ||
282 | request_fn_proc *request_fn; | |
1da177e4 LT |
283 | make_request_fn *make_request_fn; |
284 | prep_rq_fn *prep_rq_fn; | |
285 | unplug_fn *unplug_fn; | |
286 | merge_bvec_fn *merge_bvec_fn; | |
1da177e4 | 287 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 288 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 289 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 290 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 291 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 292 | |
8922e16c TH |
293 | /* |
294 | * Dispatch queue sorting | |
295 | */ | |
1b47f531 | 296 | sector_t end_sector; |
8922e16c | 297 | struct request *boundary_rq; |
8922e16c | 298 | |
1da177e4 LT |
299 | /* |
300 | * Auto-unplugging state | |
301 | */ | |
302 | struct timer_list unplug_timer; | |
303 | int unplug_thresh; /* After this many requests */ | |
304 | unsigned long unplug_delay; /* After this many jiffies */ | |
305 | struct work_struct unplug_work; | |
306 | ||
307 | struct backing_dev_info backing_dev_info; | |
308 | ||
309 | /* | |
310 | * The queue owner gets to use this for whatever they like. | |
311 | * ll_rw_blk doesn't touch it. | |
312 | */ | |
313 | void *queuedata; | |
314 | ||
1da177e4 LT |
315 | /* |
316 | * queue needs bounce pages for pages above this limit | |
317 | */ | |
8267e268 | 318 | gfp_t bounce_gfp; |
1da177e4 LT |
319 | |
320 | /* | |
321 | * various queue flags, see QUEUE_* below | |
322 | */ | |
323 | unsigned long queue_flags; | |
324 | ||
325 | /* | |
152587de | 326 | * protects queue structures from reentrancy. ->__queue_lock should |
327 | * _never_ be used directly, it is queue private. always use | |
328 | * ->queue_lock. | |
1da177e4 | 329 | */ |
152587de | 330 | spinlock_t __queue_lock; |
1da177e4 LT |
331 | spinlock_t *queue_lock; |
332 | ||
333 | /* | |
334 | * queue kobject | |
335 | */ | |
336 | struct kobject kobj; | |
337 | ||
338 | /* | |
339 | * queue settings | |
340 | */ | |
341 | unsigned long nr_requests; /* Max # of requests */ | |
342 | unsigned int nr_congestion_on; | |
343 | unsigned int nr_congestion_off; | |
344 | unsigned int nr_batching; | |
345 | ||
fa0ccd83 JB |
346 | void *dma_drain_buffer; |
347 | unsigned int dma_drain_size; | |
e3790c7d | 348 | unsigned int dma_pad_mask; |
1da177e4 LT |
349 | unsigned int dma_alignment; |
350 | ||
351 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 352 | struct list_head tag_busy_list; |
1da177e4 | 353 | |
15853af9 | 354 | unsigned int nr_sorted; |
0a7ae2ff | 355 | unsigned int in_flight[2]; |
1da177e4 | 356 | |
242f9dcb JA |
357 | unsigned int rq_timeout; |
358 | struct timer_list timeout; | |
359 | struct list_head timeout_list; | |
360 | ||
025146e1 MP |
361 | struct queue_limits limits; |
362 | ||
1da177e4 LT |
363 | /* |
364 | * sg stuff | |
365 | */ | |
366 | unsigned int sg_timeout; | |
367 | unsigned int sg_reserved_size; | |
1946089a | 368 | int node; |
6c5c9341 | 369 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 370 | struct blk_trace *blk_trace; |
6c5c9341 | 371 | #endif |
1da177e4 LT |
372 | /* |
373 | * reserved for flush operations | |
374 | */ | |
797e7dbb TH |
375 | unsigned int ordered, next_ordered, ordseq; |
376 | int orderr, ordcolor; | |
377 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
378 | struct request *orig_bar_rq; | |
483f4afc AV |
379 | |
380 | struct mutex sysfs_lock; | |
d351af01 FT |
381 | |
382 | #if defined(CONFIG_BLK_DEV_BSG) | |
383 | struct bsg_class_device bsg_dev; | |
384 | #endif | |
1da177e4 LT |
385 | }; |
386 | ||
1da177e4 LT |
387 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
388 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
389 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
390 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
391 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
392 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
393 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
394 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 395 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 396 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 397 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 398 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 399 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 400 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 401 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 402 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 403 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 404 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 405 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 406 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
bc58ba94 JA |
407 | |
408 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
409 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
01e97f6b | 410 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
411 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
412 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 413 | |
8f45c1a5 LT |
414 | static inline int queue_is_locked(struct request_queue *q) |
415 | { | |
7663c1e2 | 416 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
417 | spinlock_t *lock = q->queue_lock; |
418 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
419 | #else |
420 | return 1; | |
421 | #endif | |
8f45c1a5 LT |
422 | } |
423 | ||
75ad23bc NP |
424 | static inline void queue_flag_set_unlocked(unsigned int flag, |
425 | struct request_queue *q) | |
426 | { | |
427 | __set_bit(flag, &q->queue_flags); | |
428 | } | |
429 | ||
e48ec690 JA |
430 | static inline int queue_flag_test_and_clear(unsigned int flag, |
431 | struct request_queue *q) | |
432 | { | |
433 | WARN_ON_ONCE(!queue_is_locked(q)); | |
434 | ||
435 | if (test_bit(flag, &q->queue_flags)) { | |
436 | __clear_bit(flag, &q->queue_flags); | |
437 | return 1; | |
438 | } | |
439 | ||
440 | return 0; | |
441 | } | |
442 | ||
443 | static inline int queue_flag_test_and_set(unsigned int flag, | |
444 | struct request_queue *q) | |
445 | { | |
446 | WARN_ON_ONCE(!queue_is_locked(q)); | |
447 | ||
448 | if (!test_bit(flag, &q->queue_flags)) { | |
449 | __set_bit(flag, &q->queue_flags); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | return 1; | |
454 | } | |
455 | ||
75ad23bc NP |
456 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
457 | { | |
8f45c1a5 | 458 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
459 | __set_bit(flag, &q->queue_flags); |
460 | } | |
461 | ||
462 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
463 | struct request_queue *q) | |
464 | { | |
465 | __clear_bit(flag, &q->queue_flags); | |
466 | } | |
467 | ||
0a7ae2ff JA |
468 | static inline int queue_in_flight(struct request_queue *q) |
469 | { | |
470 | return q->in_flight[0] + q->in_flight[1]; | |
471 | } | |
472 | ||
75ad23bc NP |
473 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
474 | { | |
8f45c1a5 | 475 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
476 | __clear_bit(flag, &q->queue_flags); |
477 | } | |
478 | ||
797e7dbb TH |
479 | enum { |
480 | /* | |
481 | * Hardbarrier is supported with one of the following methods. | |
482 | * | |
483 | * NONE : hardbarrier unsupported | |
484 | * DRAIN : ordering by draining is enough | |
485 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
486 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
487 | * TAG : ordering by tag is enough | |
488 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
489 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
490 | */ | |
313e4299 TH |
491 | QUEUE_ORDERED_BY_DRAIN = 0x01, |
492 | QUEUE_ORDERED_BY_TAG = 0x02, | |
493 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, | |
f671620e | 494 | QUEUE_ORDERED_DO_BAR = 0x20, |
313e4299 TH |
495 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
496 | QUEUE_ORDERED_DO_FUA = 0x80, | |
497 | ||
498 | QUEUE_ORDERED_NONE = 0x00, | |
499 | ||
f671620e TH |
500 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
501 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
502 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
503 | QUEUE_ORDERED_DO_PREFLUSH | | |
504 | QUEUE_ORDERED_DO_POSTFLUSH, | |
505 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
506 | QUEUE_ORDERED_DO_PREFLUSH | | |
507 | QUEUE_ORDERED_DO_FUA, | |
508 | ||
f671620e TH |
509 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
510 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
511 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
512 | QUEUE_ORDERED_DO_PREFLUSH | | |
513 | QUEUE_ORDERED_DO_POSTFLUSH, | |
514 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
515 | QUEUE_ORDERED_DO_PREFLUSH | | |
516 | QUEUE_ORDERED_DO_FUA, | |
797e7dbb TH |
517 | |
518 | /* | |
519 | * Ordered operation sequence | |
520 | */ | |
521 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
522 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
523 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
524 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
525 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
526 | QUEUE_ORDSEQ_DONE = 0x20, | |
527 | }; | |
1da177e4 LT |
528 | |
529 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
530 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
531 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 532 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
533 | #define blk_queue_noxmerges(q) \ |
534 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 535 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 536 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 537 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
797e7dbb | 538 | #define blk_queue_flushing(q) ((q)->ordseq) |
4ee5eaf4 KU |
539 | #define blk_queue_stackable(q) \ |
540 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 541 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
1da177e4 | 542 | |
33659ebb CH |
543 | #define blk_noretry_request(rq) \ |
544 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
545 | REQ_FAILFAST_DRIVER)) | |
546 | ||
547 | #define blk_account_rq(rq) \ | |
548 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
549 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
550 | ((rq)->cmd_flags & REQ_DISCARD))) | |
551 | ||
1da177e4 | 552 | #define blk_pm_request(rq) \ |
33659ebb CH |
553 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
554 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 555 | |
ab780f1e | 556 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 557 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
558 | /* rq->queuelist of dequeued request must be list_empty() */ |
559 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
560 | |
561 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
562 | ||
4aff5e23 | 563 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 564 | |
9e2585a8 | 565 | /* |
1faa16d2 | 566 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 567 | */ |
1faa16d2 JA |
568 | static inline bool rw_is_sync(unsigned int rw_flags) |
569 | { | |
7b6d91da | 570 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
571 | } |
572 | ||
573 | static inline bool rq_is_sync(struct request *rq) | |
574 | { | |
575 | return rw_is_sync(rq->cmd_flags); | |
576 | } | |
577 | ||
1faa16d2 | 578 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 579 | { |
1faa16d2 JA |
580 | if (sync) |
581 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
582 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
583 | } |
584 | ||
1faa16d2 | 585 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 586 | { |
1faa16d2 JA |
587 | if (sync) |
588 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 589 | else |
1faa16d2 | 590 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
591 | } |
592 | ||
1faa16d2 | 593 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 594 | { |
1faa16d2 JA |
595 | if (sync) |
596 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 597 | else |
1faa16d2 | 598 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
599 | } |
600 | ||
601 | ||
602 | /* | |
603 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
604 | * it already be started by driver. | |
605 | */ | |
606 | #define RQ_NOMERGE_FLAGS \ | |
607 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
608 | #define rq_mergeable(rq) \ | |
e17fc0a1 | 609 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
610 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
611 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 612 | |
1da177e4 LT |
613 | /* |
614 | * q->prep_rq_fn return values | |
615 | */ | |
616 | #define BLKPREP_OK 0 /* serve it */ | |
617 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
618 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
619 | ||
620 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
621 | ||
622 | /* | |
623 | * standard bounce addresses: | |
624 | * | |
625 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
626 | * BLK_BOUNCE_ANY : don't bounce anything | |
627 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
628 | */ | |
2472892a AK |
629 | |
630 | #if BITS_PER_LONG == 32 | |
1da177e4 | 631 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
632 | #else |
633 | #define BLK_BOUNCE_HIGH -1ULL | |
634 | #endif | |
635 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 636 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 637 | |
3d6392cf JA |
638 | /* |
639 | * default timeout for SG_IO if none specified | |
640 | */ | |
641 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 642 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 643 | |
2a7326b5 | 644 | #ifdef CONFIG_BOUNCE |
1da177e4 | 645 | extern int init_emergency_isa_pool(void); |
165125e1 | 646 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
647 | #else |
648 | static inline int init_emergency_isa_pool(void) | |
649 | { | |
650 | return 0; | |
651 | } | |
165125e1 | 652 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
653 | { |
654 | } | |
655 | #endif /* CONFIG_MMU */ | |
656 | ||
152e283f FT |
657 | struct rq_map_data { |
658 | struct page **pages; | |
659 | int page_order; | |
660 | int nr_entries; | |
56c451f4 | 661 | unsigned long offset; |
97ae77a1 | 662 | int null_mapped; |
ecb554a8 | 663 | int from_user; |
152e283f FT |
664 | }; |
665 | ||
5705f702 N |
666 | struct req_iterator { |
667 | int i; | |
668 | struct bio *bio; | |
669 | }; | |
670 | ||
671 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
672 | #define for_each_bio(_bio) \ |
673 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 674 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
675 | if ((rq->bio)) \ |
676 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
677 | ||
5705f702 N |
678 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
679 | __rq_for_each_bio(_iter.bio, _rq) \ | |
680 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
681 | ||
682 | #define rq_iter_last(rq, _iter) \ | |
683 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
684 | ||
2d4dc890 IL |
685 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
686 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
687 | #endif | |
688 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
689 | extern void rq_flush_dcache_pages(struct request *rq); | |
690 | #else | |
691 | static inline void rq_flush_dcache_pages(struct request *rq) | |
692 | { | |
693 | } | |
694 | #endif | |
695 | ||
1da177e4 LT |
696 | extern int blk_register_queue(struct gendisk *disk); |
697 | extern void blk_unregister_queue(struct gendisk *disk); | |
698 | extern void register_disk(struct gendisk *dev); | |
699 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 700 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 701 | extern void blk_put_request(struct request *); |
165125e1 | 702 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 703 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
704 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
705 | gfp_t); | |
165125e1 JA |
706 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
707 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 | 708 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 709 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
710 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
711 | struct bio_set *bs, gfp_t gfp_mask, | |
712 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
713 | void *data); | |
714 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
715 | extern int blk_insert_cloned_request(struct request_queue *q, |
716 | struct request *rq); | |
165125e1 | 717 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 718 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
719 | extern int blk_remove_plug(struct request_queue *); |
720 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
721 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
722 | unsigned int, void __user *); | |
e915e872 AV |
723 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
724 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
725 | |
726 | /* | |
727 | * A queue has just exitted congestion. Note this in the global counter of | |
728 | * congested queues, and wake up anyone who was waiting for requests to be | |
729 | * put back. | |
730 | */ | |
8aa7e847 | 731 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 732 | { |
8aa7e847 | 733 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
734 | } |
735 | ||
736 | /* | |
737 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
738 | * state flags and increment the global gounter of congested queues. | |
739 | */ | |
8aa7e847 | 740 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 741 | { |
8aa7e847 | 742 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
743 | } |
744 | ||
165125e1 JA |
745 | extern void blk_start_queue(struct request_queue *q); |
746 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 747 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 748 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 749 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 750 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 751 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
752 | struct rq_map_data *, void __user *, unsigned long, |
753 | gfp_t); | |
8e5cfc45 | 754 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
755 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
756 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
757 | struct rq_map_data *, struct sg_iovec *, int, |
758 | unsigned int, gfp_t); | |
165125e1 | 759 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 760 | struct request *, int); |
165125e1 | 761 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 762 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 763 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 764 | |
165125e1 | 765 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
766 | { |
767 | return bdev->bd_disk->queue; | |
768 | } | |
769 | ||
5efccd17 | 770 | /* |
80a761fd TH |
771 | * blk_rq_pos() : the current sector |
772 | * blk_rq_bytes() : bytes left in the entire request | |
773 | * blk_rq_cur_bytes() : bytes left in the current segment | |
774 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
775 | * blk_rq_sectors() : sectors left in the entire request | |
776 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 777 | */ |
5b93629b TH |
778 | static inline sector_t blk_rq_pos(const struct request *rq) |
779 | { | |
a2dec7b3 | 780 | return rq->__sector; |
2e46e8b2 TH |
781 | } |
782 | ||
783 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
784 | { | |
a2dec7b3 | 785 | return rq->__data_len; |
5b93629b TH |
786 | } |
787 | ||
2e46e8b2 TH |
788 | static inline int blk_rq_cur_bytes(const struct request *rq) |
789 | { | |
790 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
791 | } | |
5efccd17 | 792 | |
80a761fd TH |
793 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
794 | ||
5b93629b TH |
795 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
796 | { | |
2e46e8b2 | 797 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
798 | } |
799 | ||
800 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
801 | { | |
2e46e8b2 | 802 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
803 | } |
804 | ||
9934c8c0 TH |
805 | /* |
806 | * Request issue related functions. | |
807 | */ | |
808 | extern struct request *blk_peek_request(struct request_queue *q); | |
809 | extern void blk_start_request(struct request *rq); | |
810 | extern struct request *blk_fetch_request(struct request_queue *q); | |
811 | ||
1da177e4 | 812 | /* |
2e60e022 TH |
813 | * Request completion related functions. |
814 | * | |
815 | * blk_update_request() completes given number of bytes and updates | |
816 | * the request without completing it. | |
817 | * | |
f06d9a2b TH |
818 | * blk_end_request() and friends. __blk_end_request() must be called |
819 | * with the request queue spinlock acquired. | |
1da177e4 LT |
820 | * |
821 | * Several drivers define their own end_request and call | |
3bcddeac KU |
822 | * blk_end_request() for parts of the original function. |
823 | * This prevents code duplication in drivers. | |
1da177e4 | 824 | */ |
2e60e022 TH |
825 | extern bool blk_update_request(struct request *rq, int error, |
826 | unsigned int nr_bytes); | |
b1f74493 FT |
827 | extern bool blk_end_request(struct request *rq, int error, |
828 | unsigned int nr_bytes); | |
829 | extern void blk_end_request_all(struct request *rq, int error); | |
830 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 831 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
832 | extern bool __blk_end_request(struct request *rq, int error, |
833 | unsigned int nr_bytes); | |
834 | extern void __blk_end_request_all(struct request *rq, int error); | |
835 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 836 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 837 | |
ff856bad | 838 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
839 | extern void __blk_complete_request(struct request *); |
840 | extern void blk_abort_request(struct request *); | |
11914a53 | 841 | extern void blk_abort_queue(struct request_queue *); |
ff856bad | 842 | |
1da177e4 LT |
843 | /* |
844 | * Access functions for manipulating queue properties | |
845 | */ | |
165125e1 | 846 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 847 | spinlock_t *lock, int node_id); |
01effb0d MS |
848 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
849 | request_fn_proc *, | |
850 | spinlock_t *, int node_id); | |
165125e1 | 851 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
852 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
853 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
854 | extern void blk_cleanup_queue(struct request_queue *); |
855 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
856 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 857 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 858 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 859 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
860 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
861 | unsigned int max_discard_sectors); | |
e1defc4f | 862 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
c72758f3 MP |
863 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
864 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
865 | unsigned int alignment); | |
7c958e32 | 866 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 867 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 868 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 869 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 870 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
871 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
872 | sector_t offset); | |
17be8c24 MP |
873 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
874 | sector_t offset); | |
c72758f3 MP |
875 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
876 | sector_t offset); | |
165125e1 | 877 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 878 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 879 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
880 | extern int blk_queue_dma_drain(struct request_queue *q, |
881 | dma_drain_needed_fn *dma_drain_needed, | |
882 | void *buf, unsigned int size); | |
ef9e3fac | 883 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
884 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
885 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
886 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
887 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 888 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 889 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
890 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
891 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 892 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 893 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
8f11b3e9 | 894 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 895 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 896 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 897 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 898 | |
165125e1 | 899 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 900 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 901 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 902 | extern long nr_blockdev_pages(void); |
1da177e4 | 903 | |
165125e1 JA |
904 | int blk_get_queue(struct request_queue *); |
905 | struct request_queue *blk_alloc_queue(gfp_t); | |
906 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
907 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
908 | |
909 | /* | |
910 | * tag stuff | |
911 | */ | |
4aff5e23 | 912 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
913 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
914 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
915 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
916 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
917 | extern void blk_queue_free_tags(struct request_queue *); | |
918 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
919 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
920 | extern struct blk_queue_tag *blk_init_tags(int); |
921 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 922 | |
f583f492 DS |
923 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
924 | int tag) | |
925 | { | |
926 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
927 | return NULL; | |
928 | return bqt->tag_index[tag]; | |
929 | } | |
fbd9b09a DM |
930 | enum{ |
931 | BLKDEV_WAIT, /* wait for completion */ | |
932 | BLKDEV_BARRIER, /*issue request with barrier */ | |
933 | }; | |
934 | #define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) | |
935 | #define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER) | |
936 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, | |
937 | unsigned long); | |
938 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
939 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 DM |
940 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
941 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
fb2dce86 | 942 | static inline int sb_issue_discard(struct super_block *sb, |
3e6053d7 | 943 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
944 | { |
945 | block <<= (sb->s_blocksize_bits - 9); | |
946 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
746cd1e7 | 947 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, |
fbd9b09a | 948 | BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); |
fb2dce86 | 949 | } |
1da177e4 | 950 | |
018e0446 | 951 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 952 | |
eb28d31b MP |
953 | enum blk_default_limits { |
954 | BLK_MAX_SEGMENTS = 128, | |
955 | BLK_SAFE_MAX_SECTORS = 255, | |
956 | BLK_DEF_MAX_SECTORS = 1024, | |
957 | BLK_MAX_SEGMENT_SIZE = 65536, | |
958 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
959 | }; | |
0e435ac2 | 960 | |
1da177e4 LT |
961 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
962 | ||
ae03bf63 MP |
963 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
964 | { | |
025146e1 | 965 | return q->limits.bounce_pfn; |
ae03bf63 MP |
966 | } |
967 | ||
968 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
969 | { | |
025146e1 | 970 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
971 | } |
972 | ||
973 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
974 | { | |
025146e1 | 975 | return q->limits.max_sectors; |
ae03bf63 MP |
976 | } |
977 | ||
978 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
979 | { | |
025146e1 | 980 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
981 | } |
982 | ||
8a78362c | 983 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 984 | { |
8a78362c | 985 | return q->limits.max_segments; |
ae03bf63 MP |
986 | } |
987 | ||
988 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
989 | { | |
025146e1 | 990 | return q->limits.max_segment_size; |
ae03bf63 MP |
991 | } |
992 | ||
e1defc4f | 993 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
994 | { |
995 | int retval = 512; | |
996 | ||
025146e1 MP |
997 | if (q && q->limits.logical_block_size) |
998 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
999 | |
1000 | return retval; | |
1001 | } | |
1002 | ||
e1defc4f | 1003 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1004 | { |
e1defc4f | 1005 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1006 | } |
1007 | ||
c72758f3 MP |
1008 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1009 | { | |
1010 | return q->limits.physical_block_size; | |
1011 | } | |
1012 | ||
ac481c20 MP |
1013 | static inline int bdev_physical_block_size(struct block_device *bdev) |
1014 | { | |
1015 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1016 | } | |
1017 | ||
c72758f3 MP |
1018 | static inline unsigned int queue_io_min(struct request_queue *q) |
1019 | { | |
1020 | return q->limits.io_min; | |
1021 | } | |
1022 | ||
ac481c20 MP |
1023 | static inline int bdev_io_min(struct block_device *bdev) |
1024 | { | |
1025 | return queue_io_min(bdev_get_queue(bdev)); | |
1026 | } | |
1027 | ||
c72758f3 MP |
1028 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1029 | { | |
1030 | return q->limits.io_opt; | |
1031 | } | |
1032 | ||
ac481c20 MP |
1033 | static inline int bdev_io_opt(struct block_device *bdev) |
1034 | { | |
1035 | return queue_io_opt(bdev_get_queue(bdev)); | |
1036 | } | |
1037 | ||
c72758f3 MP |
1038 | static inline int queue_alignment_offset(struct request_queue *q) |
1039 | { | |
ac481c20 | 1040 | if (q->limits.misaligned) |
c72758f3 MP |
1041 | return -1; |
1042 | ||
ac481c20 | 1043 | return q->limits.alignment_offset; |
c72758f3 MP |
1044 | } |
1045 | ||
e03a72e1 | 1046 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1047 | { |
1048 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1049 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1050 | |
e03a72e1 MP |
1051 | return (granularity + lim->alignment_offset - alignment) |
1052 | & (granularity - 1); | |
c72758f3 MP |
1053 | } |
1054 | ||
ac481c20 MP |
1055 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1056 | { | |
1057 | struct request_queue *q = bdev_get_queue(bdev); | |
1058 | ||
1059 | if (q->limits.misaligned) | |
1060 | return -1; | |
1061 | ||
1062 | if (bdev != bdev->bd_contains) | |
1063 | return bdev->bd_part->alignment_offset; | |
1064 | ||
1065 | return q->limits.alignment_offset; | |
1066 | } | |
1067 | ||
86b37281 MP |
1068 | static inline int queue_discard_alignment(struct request_queue *q) |
1069 | { | |
1070 | if (q->limits.discard_misaligned) | |
1071 | return -1; | |
1072 | ||
1073 | return q->limits.discard_alignment; | |
1074 | } | |
1075 | ||
e03a72e1 | 1076 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1077 | { |
dd3d145d MP |
1078 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1079 | ||
1080 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1081 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1082 | } |
1083 | ||
98262f27 MP |
1084 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1085 | { | |
1086 | if (q->limits.discard_zeroes_data == 1) | |
1087 | return 1; | |
1088 | ||
1089 | return 0; | |
1090 | } | |
1091 | ||
1092 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1093 | { | |
1094 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1095 | } | |
1096 | ||
165125e1 | 1097 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1098 | { |
482eb689 | 1099 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1100 | } |
1101 | ||
87904074 FT |
1102 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1103 | unsigned int len) | |
1104 | { | |
1105 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1106 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1107 | } | |
1108 | ||
1da177e4 LT |
1109 | /* assumes size > 256 */ |
1110 | static inline unsigned int blksize_bits(unsigned int size) | |
1111 | { | |
1112 | unsigned int bits = 8; | |
1113 | do { | |
1114 | bits++; | |
1115 | size >>= 1; | |
1116 | } while (size > 256); | |
1117 | return bits; | |
1118 | } | |
1119 | ||
2befb9e3 | 1120 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1121 | { |
1122 | return bdev->bd_block_size; | |
1123 | } | |
1124 | ||
1125 | typedef struct {struct page *v;} Sector; | |
1126 | ||
1127 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1128 | ||
1129 | static inline void put_dev_sector(Sector p) | |
1130 | { | |
1131 | page_cache_release(p.v); | |
1132 | } | |
1133 | ||
1134 | struct work_struct; | |
18887ad9 | 1135 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1136 | |
9195291e | 1137 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1138 | /* |
1139 | * This should not be using sched_clock(). A real patch is in progress | |
1140 | * to fix this up, until that is in place we need to disable preemption | |
1141 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1142 | */ | |
9195291e DS |
1143 | static inline void set_start_time_ns(struct request *req) |
1144 | { | |
28f4197e | 1145 | preempt_disable(); |
9195291e | 1146 | req->start_time_ns = sched_clock(); |
28f4197e | 1147 | preempt_enable(); |
9195291e DS |
1148 | } |
1149 | ||
1150 | static inline void set_io_start_time_ns(struct request *req) | |
1151 | { | |
28f4197e | 1152 | preempt_disable(); |
9195291e | 1153 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1154 | preempt_enable(); |
9195291e | 1155 | } |
84c124da DS |
1156 | |
1157 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1158 | { | |
1159 | return req->start_time_ns; | |
1160 | } | |
1161 | ||
1162 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1163 | { | |
1164 | return req->io_start_time_ns; | |
1165 | } | |
9195291e DS |
1166 | #else |
1167 | static inline void set_start_time_ns(struct request *req) {} | |
1168 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1169 | static inline uint64_t rq_start_time_ns(struct request *req) |
1170 | { | |
1171 | return 0; | |
1172 | } | |
1173 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1174 | { | |
1175 | return 0; | |
1176 | } | |
9195291e DS |
1177 | #endif |
1178 | ||
1da177e4 LT |
1179 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1180 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1181 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1182 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1183 | ||
7ba1ba12 MP |
1184 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1185 | ||
b24498d4 JA |
1186 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1187 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1188 | |
1189 | struct blk_integrity_exchg { | |
1190 | void *prot_buf; | |
1191 | void *data_buf; | |
1192 | sector_t sector; | |
1193 | unsigned int data_size; | |
1194 | unsigned short sector_size; | |
1195 | const char *disk_name; | |
1196 | }; | |
1197 | ||
1198 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1199 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1200 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1201 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1202 | ||
1203 | struct blk_integrity { | |
1204 | integrity_gen_fn *generate_fn; | |
1205 | integrity_vrfy_fn *verify_fn; | |
1206 | integrity_set_tag_fn *set_tag_fn; | |
1207 | integrity_get_tag_fn *get_tag_fn; | |
1208 | ||
1209 | unsigned short flags; | |
1210 | unsigned short tuple_size; | |
1211 | unsigned short sector_size; | |
1212 | unsigned short tag_size; | |
1213 | ||
1214 | const char *name; | |
1215 | ||
1216 | struct kobject kobj; | |
1217 | }; | |
1218 | ||
1219 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1220 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1221 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1222 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1223 | extern int blk_rq_count_integrity_sg(struct request *); | |
1224 | ||
b04accc4 JA |
1225 | static inline |
1226 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1227 | { | |
1228 | return bdev->bd_disk->integrity; | |
1229 | } | |
1230 | ||
b02739b0 MP |
1231 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1232 | { | |
1233 | return disk->integrity; | |
1234 | } | |
1235 | ||
7ba1ba12 MP |
1236 | static inline int blk_integrity_rq(struct request *rq) |
1237 | { | |
d442cc44 MP |
1238 | if (rq->bio == NULL) |
1239 | return 0; | |
1240 | ||
7ba1ba12 MP |
1241 | return bio_integrity(rq->bio); |
1242 | } | |
1243 | ||
1244 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1245 | ||
1246 | #define blk_integrity_rq(rq) (0) | |
1247 | #define blk_rq_count_integrity_sg(a) (0) | |
1248 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1249 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1250 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1251 | #define blk_integrity_compare(a, b) (0) |
1252 | #define blk_integrity_register(a, b) (0) | |
1253 | #define blk_integrity_unregister(a) do { } while (0); | |
1254 | ||
1255 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1256 | ||
08f85851 | 1257 | struct block_device_operations { |
d4430d62 AV |
1258 | int (*open) (struct block_device *, fmode_t); |
1259 | int (*release) (struct gendisk *, fmode_t); | |
1260 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
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 |