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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 | |
c186794d | 102 | * completion_data share space with the rb_node. |
e6a1c874 JA |
103 | */ |
104 | union { | |
105 | struct rb_node rb_node; /* sort/lookup */ | |
c186794d | 106 | void *completion_data; |
e6a1c874 | 107 | }; |
9817064b | 108 | |
ff7d145f | 109 | /* |
7f1dc8a2 | 110 | * Three pointers are available for the IO schedulers, if they need |
c186794d MS |
111 | * more they have to dynamically allocate it. Flush requests are |
112 | * never put on the IO scheduler. So let the flush fields share | |
113 | * space with the three elevator_private pointers. | |
ff7d145f | 114 | */ |
c186794d MS |
115 | union { |
116 | void *elevator_private[3]; | |
117 | struct { | |
118 | unsigned int seq; | |
119 | struct list_head list; | |
120 | } flush; | |
121 | }; | |
ff7d145f | 122 | |
8f34ee75 | 123 | struct gendisk *rq_disk; |
09e099d4 | 124 | struct hd_struct *part; |
1da177e4 | 125 | unsigned long start_time; |
9195291e DS |
126 | #ifdef CONFIG_BLK_CGROUP |
127 | unsigned long long start_time_ns; | |
128 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
129 | #endif | |
1da177e4 LT |
130 | /* Number of scatter-gather DMA addr+len pairs after |
131 | * physical address coalescing is performed. | |
132 | */ | |
133 | unsigned short nr_phys_segments; | |
13f05c8d MP |
134 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
135 | unsigned short nr_integrity_segments; | |
136 | #endif | |
1da177e4 | 137 | |
8f34ee75 JA |
138 | unsigned short ioprio; |
139 | ||
181fdde3 RK |
140 | int ref_count; |
141 | ||
731ec497 TH |
142 | void *special; /* opaque pointer available for LLD use */ |
143 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 144 | |
cdd60262 JA |
145 | int tag; |
146 | int errors; | |
147 | ||
1da177e4 LT |
148 | /* |
149 | * when request is used as a packet command carrier | |
150 | */ | |
d7e3c324 FT |
151 | unsigned char __cmd[BLK_MAX_CDB]; |
152 | unsigned char *cmd; | |
181fdde3 | 153 | unsigned short cmd_len; |
1da177e4 | 154 | |
7a85f889 | 155 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 156 | unsigned int sense_len; |
c3a4d78c | 157 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
158 | void *sense; |
159 | ||
242f9dcb JA |
160 | unsigned long deadline; |
161 | struct list_head timeout_list; | |
1da177e4 | 162 | unsigned int timeout; |
17e01f21 | 163 | int retries; |
1da177e4 | 164 | |
1da177e4 | 165 | /* |
c00895ab | 166 | * completion callback. |
1da177e4 LT |
167 | */ |
168 | rq_end_io_fn *end_io; | |
169 | void *end_io_data; | |
abae1fde FT |
170 | |
171 | /* for bidi */ | |
172 | struct request *next_rq; | |
1da177e4 LT |
173 | }; |
174 | ||
766ca442 FLVC |
175 | static inline unsigned short req_get_ioprio(struct request *req) |
176 | { | |
177 | return req->ioprio; | |
178 | } | |
179 | ||
1da177e4 | 180 | /* |
4aff5e23 | 181 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
182 | * requests. Some step values could eventually be made generic. |
183 | */ | |
184 | struct request_pm_state | |
185 | { | |
186 | /* PM state machine step value, currently driver specific */ | |
187 | int pm_step; | |
188 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
189 | u32 pm_state; | |
190 | void* data; /* for driver use */ | |
191 | }; | |
192 | ||
193 | #include <linux/elevator.h> | |
194 | ||
165125e1 JA |
195 | typedef void (request_fn_proc) (struct request_queue *q); |
196 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
197 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
28018c24 | 198 | typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
f7566457 | 199 | typedef void (unplugged_fn) (struct request_queue *); |
1da177e4 LT |
200 | |
201 | struct bio_vec; | |
cc371e66 AK |
202 | struct bvec_merge_data { |
203 | struct block_device *bi_bdev; | |
204 | sector_t bi_sector; | |
205 | unsigned bi_size; | |
206 | unsigned long bi_rw; | |
207 | }; | |
208 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
209 | struct bio_vec *); | |
ff856bad | 210 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 211 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 212 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 213 | |
242f9dcb JA |
214 | enum blk_eh_timer_return { |
215 | BLK_EH_NOT_HANDLED, | |
216 | BLK_EH_HANDLED, | |
217 | BLK_EH_RESET_TIMER, | |
218 | }; | |
219 | ||
220 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
221 | ||
1da177e4 LT |
222 | enum blk_queue_state { |
223 | Queue_down, | |
224 | Queue_up, | |
225 | }; | |
226 | ||
1da177e4 LT |
227 | struct blk_queue_tag { |
228 | struct request **tag_index; /* map of busy tags */ | |
229 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
230 | int busy; /* current depth */ |
231 | int max_depth; /* what we will send to device */ | |
ba025082 | 232 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
233 | atomic_t refcnt; /* map can be shared */ |
234 | }; | |
235 | ||
abf54393 FT |
236 | #define BLK_SCSI_MAX_CMDS (256) |
237 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
238 | ||
025146e1 MP |
239 | struct queue_limits { |
240 | unsigned long bounce_pfn; | |
241 | unsigned long seg_boundary_mask; | |
242 | ||
243 | unsigned int max_hw_sectors; | |
244 | unsigned int max_sectors; | |
245 | unsigned int max_segment_size; | |
c72758f3 MP |
246 | unsigned int physical_block_size; |
247 | unsigned int alignment_offset; | |
248 | unsigned int io_min; | |
249 | unsigned int io_opt; | |
67efc925 | 250 | unsigned int max_discard_sectors; |
86b37281 MP |
251 | unsigned int discard_granularity; |
252 | unsigned int discard_alignment; | |
025146e1 MP |
253 | |
254 | unsigned short logical_block_size; | |
8a78362c | 255 | unsigned short max_segments; |
13f05c8d | 256 | unsigned short max_integrity_segments; |
025146e1 | 257 | |
c72758f3 | 258 | unsigned char misaligned; |
86b37281 | 259 | unsigned char discard_misaligned; |
e692cb66 | 260 | unsigned char cluster; |
98262f27 | 261 | signed char discard_zeroes_data; |
025146e1 MP |
262 | }; |
263 | ||
1da177e4 LT |
264 | struct request_queue |
265 | { | |
266 | /* | |
267 | * Together with queue_head for cacheline sharing | |
268 | */ | |
269 | struct list_head queue_head; | |
270 | struct request *last_merge; | |
b374d18a | 271 | struct elevator_queue *elevator; |
1da177e4 LT |
272 | |
273 | /* | |
274 | * the queue request freelist, one for reads and one for writes | |
275 | */ | |
276 | struct request_list rq; | |
277 | ||
278 | request_fn_proc *request_fn; | |
1da177e4 LT |
279 | make_request_fn *make_request_fn; |
280 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 281 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 282 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 283 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 284 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 285 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 286 | lld_busy_fn *lld_busy_fn; |
f7566457 | 287 | unplugged_fn *unplugged_fn; |
1da177e4 | 288 | |
8922e16c TH |
289 | /* |
290 | * Dispatch queue sorting | |
291 | */ | |
1b47f531 | 292 | sector_t end_sector; |
8922e16c | 293 | struct request *boundary_rq; |
8922e16c | 294 | |
1da177e4 | 295 | /* |
3cca6dc1 | 296 | * Delayed queue handling |
1da177e4 | 297 | */ |
3cca6dc1 | 298 | struct delayed_work delay_work; |
1da177e4 LT |
299 | |
300 | struct backing_dev_info backing_dev_info; | |
301 | ||
302 | /* | |
303 | * The queue owner gets to use this for whatever they like. | |
304 | * ll_rw_blk doesn't touch it. | |
305 | */ | |
306 | void *queuedata; | |
307 | ||
1da177e4 LT |
308 | /* |
309 | * queue needs bounce pages for pages above this limit | |
310 | */ | |
8267e268 | 311 | gfp_t bounce_gfp; |
1da177e4 LT |
312 | |
313 | /* | |
314 | * various queue flags, see QUEUE_* below | |
315 | */ | |
316 | unsigned long queue_flags; | |
317 | ||
318 | /* | |
152587de JA |
319 | * protects queue structures from reentrancy. ->__queue_lock should |
320 | * _never_ be used directly, it is queue private. always use | |
321 | * ->queue_lock. | |
1da177e4 | 322 | */ |
152587de | 323 | spinlock_t __queue_lock; |
1da177e4 LT |
324 | spinlock_t *queue_lock; |
325 | ||
326 | /* | |
327 | * queue kobject | |
328 | */ | |
329 | struct kobject kobj; | |
330 | ||
331 | /* | |
332 | * queue settings | |
333 | */ | |
334 | unsigned long nr_requests; /* Max # of requests */ | |
335 | unsigned int nr_congestion_on; | |
336 | unsigned int nr_congestion_off; | |
337 | unsigned int nr_batching; | |
338 | ||
fa0ccd83 JB |
339 | void *dma_drain_buffer; |
340 | unsigned int dma_drain_size; | |
e3790c7d | 341 | unsigned int dma_pad_mask; |
1da177e4 LT |
342 | unsigned int dma_alignment; |
343 | ||
344 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 345 | struct list_head tag_busy_list; |
1da177e4 | 346 | |
15853af9 | 347 | unsigned int nr_sorted; |
0a7ae2ff | 348 | unsigned int in_flight[2]; |
1da177e4 | 349 | |
242f9dcb JA |
350 | unsigned int rq_timeout; |
351 | struct timer_list timeout; | |
352 | struct list_head timeout_list; | |
353 | ||
025146e1 MP |
354 | struct queue_limits limits; |
355 | ||
1da177e4 LT |
356 | /* |
357 | * sg stuff | |
358 | */ | |
359 | unsigned int sg_timeout; | |
360 | unsigned int sg_reserved_size; | |
1946089a | 361 | int node; |
6c5c9341 | 362 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 363 | struct blk_trace *blk_trace; |
6c5c9341 | 364 | #endif |
1da177e4 | 365 | /* |
4913efe4 | 366 | * for flush operations |
1da177e4 | 367 | */ |
4913efe4 | 368 | unsigned int flush_flags; |
ae1b1539 TH |
369 | unsigned int flush_pending_idx:1; |
370 | unsigned int flush_running_idx:1; | |
371 | unsigned long flush_pending_since; | |
372 | struct list_head flush_queue[2]; | |
373 | struct list_head flush_data_in_flight; | |
dd4c133f | 374 | struct request flush_rq; |
483f4afc AV |
375 | |
376 | struct mutex sysfs_lock; | |
d351af01 FT |
377 | |
378 | #if defined(CONFIG_BLK_DEV_BSG) | |
379 | struct bsg_class_device bsg_dev; | |
380 | #endif | |
e43473b7 VG |
381 | |
382 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
383 | /* Throttle data */ | |
384 | struct throtl_data *td; | |
385 | #endif | |
1da177e4 LT |
386 | }; |
387 | ||
1da177e4 LT |
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 */ | |
7eaceacc JA |
394 | #define QUEUE_FLAG_ELVSWITCH 7 /* don't use elevator, just do FIFO */ |
395 | #define QUEUE_FLAG_BIDI 8 /* queue supports bidi requests */ | |
396 | #define QUEUE_FLAG_NOMERGES 9 /* disable merge attempts */ | |
397 | #define QUEUE_FLAG_SAME_COMP 10 /* force complete on same CPU */ | |
398 | #define QUEUE_FLAG_FAIL_IO 11 /* fake timeout */ | |
399 | #define QUEUE_FLAG_STACKABLE 12 /* supports request stacking */ | |
400 | #define QUEUE_FLAG_NONROT 13 /* non-rotational device (SSD) */ | |
88e740f1 | 401 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 402 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 403 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 404 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 405 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
8d57a98c | 406 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
bc58ba94 JA |
407 | |
408 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 409 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
410 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
411 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 412 | |
8f45c1a5 LT |
413 | static inline int queue_is_locked(struct request_queue *q) |
414 | { | |
7663c1e2 | 415 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
416 | spinlock_t *lock = q->queue_lock; |
417 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
418 | #else |
419 | return 1; | |
420 | #endif | |
8f45c1a5 LT |
421 | } |
422 | ||
75ad23bc NP |
423 | static inline void queue_flag_set_unlocked(unsigned int flag, |
424 | struct request_queue *q) | |
425 | { | |
426 | __set_bit(flag, &q->queue_flags); | |
427 | } | |
428 | ||
e48ec690 JA |
429 | static inline int queue_flag_test_and_clear(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 | __clear_bit(flag, &q->queue_flags); | |
436 | return 1; | |
437 | } | |
438 | ||
439 | return 0; | |
440 | } | |
441 | ||
442 | static inline int queue_flag_test_and_set(unsigned int flag, | |
443 | struct request_queue *q) | |
444 | { | |
445 | WARN_ON_ONCE(!queue_is_locked(q)); | |
446 | ||
447 | if (!test_bit(flag, &q->queue_flags)) { | |
448 | __set_bit(flag, &q->queue_flags); | |
449 | return 0; | |
450 | } | |
451 | ||
452 | return 1; | |
453 | } | |
454 | ||
75ad23bc NP |
455 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
456 | { | |
8f45c1a5 | 457 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
458 | __set_bit(flag, &q->queue_flags); |
459 | } | |
460 | ||
461 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
462 | struct request_queue *q) | |
463 | { | |
464 | __clear_bit(flag, &q->queue_flags); | |
465 | } | |
466 | ||
0a7ae2ff JA |
467 | static inline int queue_in_flight(struct request_queue *q) |
468 | { | |
469 | return q->in_flight[0] + q->in_flight[1]; | |
470 | } | |
471 | ||
75ad23bc NP |
472 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
473 | { | |
8f45c1a5 | 474 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
475 | __clear_bit(flag, &q->queue_flags); |
476 | } | |
477 | ||
1da177e4 LT |
478 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
479 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 480 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
481 | #define blk_queue_noxmerges(q) \ |
482 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 483 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 484 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 485 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
486 | #define blk_queue_stackable(q) \ |
487 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 488 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
489 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
490 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 491 | |
33659ebb CH |
492 | #define blk_noretry_request(rq) \ |
493 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
494 | REQ_FAILFAST_DRIVER)) | |
495 | ||
496 | #define blk_account_rq(rq) \ | |
497 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
498 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
499 | ((rq)->cmd_flags & REQ_DISCARD))) | |
500 | ||
1da177e4 | 501 | #define blk_pm_request(rq) \ |
33659ebb CH |
502 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
503 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 504 | |
ab780f1e | 505 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 506 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
507 | /* rq->queuelist of dequeued request must be list_empty() */ |
508 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
509 | |
510 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
511 | ||
4aff5e23 | 512 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 513 | |
e692cb66 MP |
514 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
515 | { | |
516 | return q->limits.cluster; | |
517 | } | |
518 | ||
9e2585a8 | 519 | /* |
1faa16d2 | 520 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 521 | */ |
1faa16d2 JA |
522 | static inline bool rw_is_sync(unsigned int rw_flags) |
523 | { | |
7b6d91da | 524 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
525 | } |
526 | ||
527 | static inline bool rq_is_sync(struct request *rq) | |
528 | { | |
529 | return rw_is_sync(rq->cmd_flags); | |
530 | } | |
531 | ||
1faa16d2 | 532 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 533 | { |
1faa16d2 JA |
534 | if (sync) |
535 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
536 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
537 | } |
538 | ||
1faa16d2 | 539 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 540 | { |
1faa16d2 JA |
541 | if (sync) |
542 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 543 | else |
1faa16d2 | 544 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
545 | } |
546 | ||
1faa16d2 | 547 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 548 | { |
1faa16d2 JA |
549 | if (sync) |
550 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 551 | else |
1faa16d2 | 552 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
553 | } |
554 | ||
555 | ||
556 | /* | |
557 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
558 | * it already be started by driver. | |
559 | */ | |
560 | #define RQ_NOMERGE_FLAGS \ | |
02e031cb | 561 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) |
1da177e4 | 562 | #define rq_mergeable(rq) \ |
e17fc0a1 | 563 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
564 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
565 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 566 | |
1da177e4 LT |
567 | /* |
568 | * q->prep_rq_fn return values | |
569 | */ | |
570 | #define BLKPREP_OK 0 /* serve it */ | |
571 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
572 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
573 | ||
574 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
575 | ||
576 | /* | |
577 | * standard bounce addresses: | |
578 | * | |
579 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
580 | * BLK_BOUNCE_ANY : don't bounce anything | |
581 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
582 | */ | |
2472892a AK |
583 | |
584 | #if BITS_PER_LONG == 32 | |
1da177e4 | 585 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
586 | #else |
587 | #define BLK_BOUNCE_HIGH -1ULL | |
588 | #endif | |
589 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 590 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 591 | |
3d6392cf JA |
592 | /* |
593 | * default timeout for SG_IO if none specified | |
594 | */ | |
595 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 596 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 597 | |
2a7326b5 | 598 | #ifdef CONFIG_BOUNCE |
1da177e4 | 599 | extern int init_emergency_isa_pool(void); |
165125e1 | 600 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
601 | #else |
602 | static inline int init_emergency_isa_pool(void) | |
603 | { | |
604 | return 0; | |
605 | } | |
165125e1 | 606 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
607 | { |
608 | } | |
609 | #endif /* CONFIG_MMU */ | |
610 | ||
152e283f FT |
611 | struct rq_map_data { |
612 | struct page **pages; | |
613 | int page_order; | |
614 | int nr_entries; | |
56c451f4 | 615 | unsigned long offset; |
97ae77a1 | 616 | int null_mapped; |
ecb554a8 | 617 | int from_user; |
152e283f FT |
618 | }; |
619 | ||
5705f702 N |
620 | struct req_iterator { |
621 | int i; | |
622 | struct bio *bio; | |
623 | }; | |
624 | ||
625 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
626 | #define for_each_bio(_bio) \ |
627 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 628 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
629 | if ((rq->bio)) \ |
630 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
631 | ||
5705f702 N |
632 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
633 | __rq_for_each_bio(_iter.bio, _rq) \ | |
634 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
635 | ||
636 | #define rq_iter_last(rq, _iter) \ | |
637 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
638 | ||
2d4dc890 IL |
639 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
640 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
641 | #endif | |
642 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
643 | extern void rq_flush_dcache_pages(struct request *rq); | |
644 | #else | |
645 | static inline void rq_flush_dcache_pages(struct request *rq) | |
646 | { | |
647 | } | |
648 | #endif | |
649 | ||
1da177e4 LT |
650 | extern int blk_register_queue(struct gendisk *disk); |
651 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 652 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 653 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 654 | extern void blk_put_request(struct request *); |
165125e1 | 655 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 656 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
657 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
658 | gfp_t); | |
165125e1 JA |
659 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
660 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
66ac0280 CH |
661 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
662 | unsigned int len); | |
82124d60 | 663 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 664 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
665 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
666 | struct bio_set *bs, gfp_t gfp_mask, | |
667 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
668 | void *data); | |
669 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
670 | extern int blk_insert_cloned_request(struct request_queue *q, |
671 | struct request *rq); | |
3cca6dc1 | 672 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 673 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
74f3c8af AV |
674 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
675 | unsigned int, void __user *); | |
e915e872 AV |
676 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
677 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
678 | |
679 | /* | |
680 | * A queue has just exitted congestion. Note this in the global counter of | |
681 | * congested queues, and wake up anyone who was waiting for requests to be | |
682 | * put back. | |
683 | */ | |
8aa7e847 | 684 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 685 | { |
8aa7e847 | 686 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
687 | } |
688 | ||
689 | /* | |
690 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
691 | * state flags and increment the global gounter of congested queues. | |
692 | */ | |
8aa7e847 | 693 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 694 | { |
8aa7e847 | 695 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
696 | } |
697 | ||
165125e1 JA |
698 | extern void blk_start_queue(struct request_queue *q); |
699 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 700 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 701 | extern void __blk_stop_queue(struct request_queue *q); |
1654e741 | 702 | extern void __blk_run_queue(struct request_queue *q, bool force_kblockd); |
165125e1 | 703 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 704 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
705 | struct rq_map_data *, void __user *, unsigned long, |
706 | gfp_t); | |
8e5cfc45 | 707 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
708 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
709 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
710 | struct rq_map_data *, struct sg_iovec *, int, |
711 | unsigned int, gfp_t); | |
165125e1 | 712 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 713 | struct request *, int); |
165125e1 | 714 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 715 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 716 | |
165125e1 | 717 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
718 | { |
719 | return bdev->bd_disk->queue; | |
720 | } | |
721 | ||
5efccd17 | 722 | /* |
80a761fd TH |
723 | * blk_rq_pos() : the current sector |
724 | * blk_rq_bytes() : bytes left in the entire request | |
725 | * blk_rq_cur_bytes() : bytes left in the current segment | |
726 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
727 | * blk_rq_sectors() : sectors left in the entire request | |
728 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 729 | */ |
5b93629b TH |
730 | static inline sector_t blk_rq_pos(const struct request *rq) |
731 | { | |
a2dec7b3 | 732 | return rq->__sector; |
2e46e8b2 TH |
733 | } |
734 | ||
735 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
736 | { | |
a2dec7b3 | 737 | return rq->__data_len; |
5b93629b TH |
738 | } |
739 | ||
2e46e8b2 TH |
740 | static inline int blk_rq_cur_bytes(const struct request *rq) |
741 | { | |
742 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
743 | } | |
5efccd17 | 744 | |
80a761fd TH |
745 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
746 | ||
5b93629b TH |
747 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
748 | { | |
2e46e8b2 | 749 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
750 | } |
751 | ||
752 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
753 | { | |
2e46e8b2 | 754 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
755 | } |
756 | ||
9934c8c0 TH |
757 | /* |
758 | * Request issue related functions. | |
759 | */ | |
760 | extern struct request *blk_peek_request(struct request_queue *q); | |
761 | extern void blk_start_request(struct request *rq); | |
762 | extern struct request *blk_fetch_request(struct request_queue *q); | |
763 | ||
1da177e4 | 764 | /* |
2e60e022 TH |
765 | * Request completion related functions. |
766 | * | |
767 | * blk_update_request() completes given number of bytes and updates | |
768 | * the request without completing it. | |
769 | * | |
f06d9a2b TH |
770 | * blk_end_request() and friends. __blk_end_request() must be called |
771 | * with the request queue spinlock acquired. | |
1da177e4 LT |
772 | * |
773 | * Several drivers define their own end_request and call | |
3bcddeac KU |
774 | * blk_end_request() for parts of the original function. |
775 | * This prevents code duplication in drivers. | |
1da177e4 | 776 | */ |
2e60e022 TH |
777 | extern bool blk_update_request(struct request *rq, int error, |
778 | unsigned int nr_bytes); | |
b1f74493 FT |
779 | extern bool blk_end_request(struct request *rq, int error, |
780 | unsigned int nr_bytes); | |
781 | extern void blk_end_request_all(struct request *rq, int error); | |
782 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 783 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
784 | extern bool __blk_end_request(struct request *rq, int error, |
785 | unsigned int nr_bytes); | |
786 | extern void __blk_end_request_all(struct request *rq, int error); | |
787 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 788 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 789 | |
ff856bad | 790 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
791 | extern void __blk_complete_request(struct request *); |
792 | extern void blk_abort_request(struct request *); | |
11914a53 | 793 | extern void blk_abort_queue(struct request_queue *); |
28018c24 | 794 | extern void blk_unprep_request(struct request *); |
ff856bad | 795 | |
1da177e4 LT |
796 | /* |
797 | * Access functions for manipulating queue properties | |
798 | */ | |
165125e1 | 799 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 800 | spinlock_t *lock, int node_id); |
01effb0d MS |
801 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
802 | request_fn_proc *, | |
803 | spinlock_t *, int node_id); | |
165125e1 | 804 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
805 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
806 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
807 | extern void blk_cleanup_queue(struct request_queue *); |
808 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
809 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 810 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 811 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 812 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 813 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
814 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
815 | unsigned int max_discard_sectors); | |
e1defc4f | 816 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 817 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
818 | extern void blk_queue_alignment_offset(struct request_queue *q, |
819 | unsigned int alignment); | |
7c958e32 | 820 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 821 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 822 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 823 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 824 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
825 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
826 | sector_t offset); | |
17be8c24 MP |
827 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
828 | sector_t offset); | |
c72758f3 MP |
829 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
830 | sector_t offset); | |
165125e1 | 831 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 832 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 833 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
834 | extern int blk_queue_dma_drain(struct request_queue *q, |
835 | dma_drain_needed_fn *dma_drain_needed, | |
836 | void *buf, unsigned int size); | |
ef9e3fac | 837 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
838 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
839 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 840 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
841 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
842 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 843 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 844 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb | 845 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
f7566457 | 846 | extern void blk_queue_unplugged(struct request_queue *, unplugged_fn *); |
242f9dcb | 847 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); |
4913efe4 | 848 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
1da177e4 | 849 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 850 | |
165125e1 | 851 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 852 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 853 | extern long nr_blockdev_pages(void); |
1da177e4 | 854 | |
165125e1 JA |
855 | int blk_get_queue(struct request_queue *); |
856 | struct request_queue *blk_alloc_queue(gfp_t); | |
857 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
858 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 859 | |
73c10101 JA |
860 | struct blk_plug { |
861 | unsigned long magic; | |
862 | struct list_head list; | |
863 | unsigned int should_sort; | |
864 | }; | |
865 | ||
866 | extern void blk_start_plug(struct blk_plug *); | |
867 | extern void blk_finish_plug(struct blk_plug *); | |
868 | extern void __blk_flush_plug(struct task_struct *, struct blk_plug *); | |
869 | ||
870 | static inline void blk_flush_plug(struct task_struct *tsk) | |
871 | { | |
872 | struct blk_plug *plug = tsk->plug; | |
873 | ||
874 | if (unlikely(plug)) | |
875 | __blk_flush_plug(tsk, plug); | |
876 | } | |
877 | ||
878 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
879 | { | |
880 | struct blk_plug *plug = tsk->plug; | |
881 | ||
882 | return plug && !list_empty(&plug->list); | |
883 | } | |
884 | ||
1da177e4 LT |
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 | } | |
dd3932ed CH |
906 | |
907 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
908 | ||
909 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
910 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
911 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 | 912 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 913 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
914 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
915 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 916 | { |
2cf6d26a CH |
917 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
918 | nr_blocks << (sb->s_blocksize_bits - 9), | |
919 | gfp_mask, flags); | |
fb2dce86 | 920 | } |
e6fa0be6 | 921 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 922 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
923 | { |
924 | return blkdev_issue_zeroout(sb->s_bdev, | |
925 | block << (sb->s_blocksize_bits - 9), | |
926 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 927 | gfp_mask); |
e6fa0be6 | 928 | } |
1da177e4 | 929 | |
018e0446 | 930 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 931 | |
eb28d31b MP |
932 | enum blk_default_limits { |
933 | BLK_MAX_SEGMENTS = 128, | |
934 | BLK_SAFE_MAX_SECTORS = 255, | |
935 | BLK_DEF_MAX_SECTORS = 1024, | |
936 | BLK_MAX_SEGMENT_SIZE = 65536, | |
937 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
938 | }; | |
0e435ac2 | 939 | |
1da177e4 LT |
940 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
941 | ||
ae03bf63 MP |
942 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
943 | { | |
025146e1 | 944 | return q->limits.bounce_pfn; |
ae03bf63 MP |
945 | } |
946 | ||
947 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
948 | { | |
025146e1 | 949 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
950 | } |
951 | ||
952 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
953 | { | |
025146e1 | 954 | return q->limits.max_sectors; |
ae03bf63 MP |
955 | } |
956 | ||
957 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
958 | { | |
025146e1 | 959 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
960 | } |
961 | ||
8a78362c | 962 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 963 | { |
8a78362c | 964 | return q->limits.max_segments; |
ae03bf63 MP |
965 | } |
966 | ||
967 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
968 | { | |
025146e1 | 969 | return q->limits.max_segment_size; |
ae03bf63 MP |
970 | } |
971 | ||
e1defc4f | 972 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
973 | { |
974 | int retval = 512; | |
975 | ||
025146e1 MP |
976 | if (q && q->limits.logical_block_size) |
977 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
978 | |
979 | return retval; | |
980 | } | |
981 | ||
e1defc4f | 982 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 983 | { |
e1defc4f | 984 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
985 | } |
986 | ||
c72758f3 MP |
987 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
988 | { | |
989 | return q->limits.physical_block_size; | |
990 | } | |
991 | ||
892b6f90 | 992 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
993 | { |
994 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
995 | } | |
996 | ||
c72758f3 MP |
997 | static inline unsigned int queue_io_min(struct request_queue *q) |
998 | { | |
999 | return q->limits.io_min; | |
1000 | } | |
1001 | ||
ac481c20 MP |
1002 | static inline int bdev_io_min(struct block_device *bdev) |
1003 | { | |
1004 | return queue_io_min(bdev_get_queue(bdev)); | |
1005 | } | |
1006 | ||
c72758f3 MP |
1007 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1008 | { | |
1009 | return q->limits.io_opt; | |
1010 | } | |
1011 | ||
ac481c20 MP |
1012 | static inline int bdev_io_opt(struct block_device *bdev) |
1013 | { | |
1014 | return queue_io_opt(bdev_get_queue(bdev)); | |
1015 | } | |
1016 | ||
c72758f3 MP |
1017 | static inline int queue_alignment_offset(struct request_queue *q) |
1018 | { | |
ac481c20 | 1019 | if (q->limits.misaligned) |
c72758f3 MP |
1020 | return -1; |
1021 | ||
ac481c20 | 1022 | return q->limits.alignment_offset; |
c72758f3 MP |
1023 | } |
1024 | ||
e03a72e1 | 1025 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1026 | { |
1027 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1028 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1029 | |
e03a72e1 MP |
1030 | return (granularity + lim->alignment_offset - alignment) |
1031 | & (granularity - 1); | |
c72758f3 MP |
1032 | } |
1033 | ||
ac481c20 MP |
1034 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1035 | { | |
1036 | struct request_queue *q = bdev_get_queue(bdev); | |
1037 | ||
1038 | if (q->limits.misaligned) | |
1039 | return -1; | |
1040 | ||
1041 | if (bdev != bdev->bd_contains) | |
1042 | return bdev->bd_part->alignment_offset; | |
1043 | ||
1044 | return q->limits.alignment_offset; | |
1045 | } | |
1046 | ||
86b37281 MP |
1047 | static inline int queue_discard_alignment(struct request_queue *q) |
1048 | { | |
1049 | if (q->limits.discard_misaligned) | |
1050 | return -1; | |
1051 | ||
1052 | return q->limits.discard_alignment; | |
1053 | } | |
1054 | ||
e03a72e1 | 1055 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1056 | { |
dd3d145d MP |
1057 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1058 | ||
1059 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1060 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1061 | } |
1062 | ||
98262f27 MP |
1063 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1064 | { | |
1065 | if (q->limits.discard_zeroes_data == 1) | |
1066 | return 1; | |
1067 | ||
1068 | return 0; | |
1069 | } | |
1070 | ||
1071 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1072 | { | |
1073 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1074 | } | |
1075 | ||
165125e1 | 1076 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1077 | { |
482eb689 | 1078 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1079 | } |
1080 | ||
14417799 | 1081 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1082 | unsigned int len) |
1083 | { | |
1084 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1085 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1086 | } |
1087 | ||
1da177e4 LT |
1088 | /* assumes size > 256 */ |
1089 | static inline unsigned int blksize_bits(unsigned int size) | |
1090 | { | |
1091 | unsigned int bits = 8; | |
1092 | do { | |
1093 | bits++; | |
1094 | size >>= 1; | |
1095 | } while (size > 256); | |
1096 | return bits; | |
1097 | } | |
1098 | ||
2befb9e3 | 1099 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1100 | { |
1101 | return bdev->bd_block_size; | |
1102 | } | |
1103 | ||
1104 | typedef struct {struct page *v;} Sector; | |
1105 | ||
1106 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1107 | ||
1108 | static inline void put_dev_sector(Sector p) | |
1109 | { | |
1110 | page_cache_release(p.v); | |
1111 | } | |
1112 | ||
1113 | struct work_struct; | |
18887ad9 | 1114 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1115 | |
9195291e | 1116 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1117 | /* |
1118 | * This should not be using sched_clock(). A real patch is in progress | |
1119 | * to fix this up, until that is in place we need to disable preemption | |
1120 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1121 | */ | |
9195291e DS |
1122 | static inline void set_start_time_ns(struct request *req) |
1123 | { | |
28f4197e | 1124 | preempt_disable(); |
9195291e | 1125 | req->start_time_ns = sched_clock(); |
28f4197e | 1126 | preempt_enable(); |
9195291e DS |
1127 | } |
1128 | ||
1129 | static inline void set_io_start_time_ns(struct request *req) | |
1130 | { | |
28f4197e | 1131 | preempt_disable(); |
9195291e | 1132 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1133 | preempt_enable(); |
9195291e | 1134 | } |
84c124da DS |
1135 | |
1136 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1137 | { | |
1138 | return req->start_time_ns; | |
1139 | } | |
1140 | ||
1141 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1142 | { | |
1143 | return req->io_start_time_ns; | |
1144 | } | |
9195291e DS |
1145 | #else |
1146 | static inline void set_start_time_ns(struct request *req) {} | |
1147 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1148 | static inline uint64_t rq_start_time_ns(struct request *req) |
1149 | { | |
1150 | return 0; | |
1151 | } | |
1152 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1153 | { | |
1154 | return 0; | |
1155 | } | |
9195291e DS |
1156 | #endif |
1157 | ||
e43473b7 VG |
1158 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1159 | extern int blk_throtl_init(struct request_queue *q); | |
1160 | extern void blk_throtl_exit(struct request_queue *q); | |
1161 | extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); | |
e43473b7 VG |
1162 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
1163 | static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) | |
1164 | { | |
1165 | return 0; | |
1166 | } | |
1167 | ||
1168 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } | |
1169 | static inline int blk_throtl_exit(struct request_queue *q) { return 0; } | |
e43473b7 VG |
1170 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
1171 | ||
1da177e4 LT |
1172 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1173 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1174 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1175 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1176 | ||
7ba1ba12 MP |
1177 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1178 | ||
b24498d4 JA |
1179 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1180 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1181 | |
1182 | struct blk_integrity_exchg { | |
1183 | void *prot_buf; | |
1184 | void *data_buf; | |
1185 | sector_t sector; | |
1186 | unsigned int data_size; | |
1187 | unsigned short sector_size; | |
1188 | const char *disk_name; | |
1189 | }; | |
1190 | ||
1191 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1192 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1193 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1194 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1195 | ||
1196 | struct blk_integrity { | |
1197 | integrity_gen_fn *generate_fn; | |
1198 | integrity_vrfy_fn *verify_fn; | |
1199 | integrity_set_tag_fn *set_tag_fn; | |
1200 | integrity_get_tag_fn *get_tag_fn; | |
1201 | ||
1202 | unsigned short flags; | |
1203 | unsigned short tuple_size; | |
1204 | unsigned short sector_size; | |
1205 | unsigned short tag_size; | |
1206 | ||
1207 | const char *name; | |
1208 | ||
1209 | struct kobject kobj; | |
1210 | }; | |
1211 | ||
a63a5cf8 | 1212 | extern bool blk_integrity_is_initialized(struct gendisk *); |
7ba1ba12 MP |
1213 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); |
1214 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1215 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1216 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1217 | struct scatterlist *); | |
1218 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1219 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1220 | struct request *); | |
1221 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1222 | struct bio *); | |
7ba1ba12 | 1223 | |
b04accc4 JA |
1224 | static inline |
1225 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1226 | { | |
1227 | return bdev->bd_disk->integrity; | |
1228 | } | |
1229 | ||
b02739b0 MP |
1230 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1231 | { | |
1232 | return disk->integrity; | |
1233 | } | |
1234 | ||
7ba1ba12 MP |
1235 | static inline int blk_integrity_rq(struct request *rq) |
1236 | { | |
d442cc44 MP |
1237 | if (rq->bio == NULL) |
1238 | return 0; | |
1239 | ||
7ba1ba12 MP |
1240 | return bio_integrity(rq->bio); |
1241 | } | |
1242 | ||
13f05c8d MP |
1243 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1244 | unsigned int segs) | |
1245 | { | |
1246 | q->limits.max_integrity_segments = segs; | |
1247 | } | |
1248 | ||
1249 | static inline unsigned short | |
1250 | queue_max_integrity_segments(struct request_queue *q) | |
1251 | { | |
1252 | return q->limits.max_integrity_segments; | |
1253 | } | |
1254 | ||
7ba1ba12 MP |
1255 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1256 | ||
1257 | #define blk_integrity_rq(rq) (0) | |
13f05c8d MP |
1258 | #define blk_rq_count_integrity_sg(a, b) (0) |
1259 | #define blk_rq_map_integrity_sg(a, b, c) (0) | |
b04accc4 | 1260 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1261 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1262 | #define blk_integrity_compare(a, b) (0) |
1263 | #define blk_integrity_register(a, b) (0) | |
1264 | #define blk_integrity_unregister(a) do { } while (0); | |
13f05c8d MP |
1265 | #define blk_queue_max_integrity_segments(a, b) do { } while (0); |
1266 | #define queue_max_integrity_segments(a) (0) | |
1267 | #define blk_integrity_merge_rq(a, b, c) (0) | |
1268 | #define blk_integrity_merge_bio(a, b, c) (0) | |
a63a5cf8 | 1269 | #define blk_integrity_is_initialized(a) (0) |
7ba1ba12 MP |
1270 | |
1271 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1272 | ||
08f85851 | 1273 | struct block_device_operations { |
d4430d62 AV |
1274 | int (*open) (struct block_device *, fmode_t); |
1275 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1276 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1277 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1278 | int (*direct_access) (struct block_device *, sector_t, |
1279 | void **, unsigned long *); | |
77ea887e TH |
1280 | unsigned int (*check_events) (struct gendisk *disk, |
1281 | unsigned int clearing); | |
1282 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1283 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1284 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1285 | int (*revalidate_disk) (struct gendisk *); |
1286 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1287 | /* this callback is with swap_lock and sometimes page table lock held */ |
1288 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1289 | struct module *owner; |
1290 | }; | |
1291 | ||
633a08b8 AV |
1292 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1293 | unsigned long); | |
9361401e DH |
1294 | #else /* CONFIG_BLOCK */ |
1295 | /* | |
1296 | * stubs for when the block layer is configured out | |
1297 | */ | |
1298 | #define buffer_heads_over_limit 0 | |
1299 | ||
9361401e DH |
1300 | static inline long nr_blockdev_pages(void) |
1301 | { | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1f940bdf JA |
1305 | struct blk_plug { |
1306 | }; | |
1307 | ||
1308 | static inline void blk_start_plug(struct blk_plug *plug) | |
73c10101 JA |
1309 | { |
1310 | } | |
1311 | ||
1f940bdf | 1312 | static inline void blk_finish_plug(struct blk_plug *plug) |
73c10101 JA |
1313 | { |
1314 | } | |
1315 | ||
1f940bdf | 1316 | static inline void blk_flush_plug(struct task_struct *task) |
73c10101 JA |
1317 | { |
1318 | } | |
1319 | ||
1320 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1321 | { | |
1322 | return false; | |
1323 | } | |
1324 | ||
9361401e DH |
1325 | #endif /* CONFIG_BLOCK */ |
1326 | ||
1da177e4 | 1327 | #endif |