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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 *); |
1da177e4 LT |
199 | |
200 | struct bio_vec; | |
cc371e66 AK |
201 | struct bvec_merge_data { |
202 | struct block_device *bi_bdev; | |
203 | sector_t bi_sector; | |
204 | unsigned bi_size; | |
205 | unsigned long bi_rw; | |
206 | }; | |
207 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
208 | struct bio_vec *); | |
ff856bad | 209 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 210 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 211 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 212 | |
242f9dcb JA |
213 | enum blk_eh_timer_return { |
214 | BLK_EH_NOT_HANDLED, | |
215 | BLK_EH_HANDLED, | |
216 | BLK_EH_RESET_TIMER, | |
217 | }; | |
218 | ||
219 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
220 | ||
1da177e4 LT |
221 | enum blk_queue_state { |
222 | Queue_down, | |
223 | Queue_up, | |
224 | }; | |
225 | ||
1da177e4 LT |
226 | struct blk_queue_tag { |
227 | struct request **tag_index; /* map of busy tags */ | |
228 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
229 | int busy; /* current depth */ |
230 | int max_depth; /* what we will send to device */ | |
ba025082 | 231 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
232 | atomic_t refcnt; /* map can be shared */ |
233 | }; | |
234 | ||
abf54393 FT |
235 | #define BLK_SCSI_MAX_CMDS (256) |
236 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
237 | ||
025146e1 MP |
238 | struct queue_limits { |
239 | unsigned long bounce_pfn; | |
240 | unsigned long seg_boundary_mask; | |
241 | ||
242 | unsigned int max_hw_sectors; | |
243 | unsigned int max_sectors; | |
244 | unsigned int max_segment_size; | |
c72758f3 MP |
245 | unsigned int physical_block_size; |
246 | unsigned int alignment_offset; | |
247 | unsigned int io_min; | |
248 | unsigned int io_opt; | |
67efc925 | 249 | unsigned int max_discard_sectors; |
86b37281 MP |
250 | unsigned int discard_granularity; |
251 | unsigned int discard_alignment; | |
025146e1 MP |
252 | |
253 | unsigned short logical_block_size; | |
8a78362c | 254 | unsigned short max_segments; |
13f05c8d | 255 | unsigned short max_integrity_segments; |
025146e1 | 256 | |
c72758f3 | 257 | unsigned char misaligned; |
86b37281 | 258 | unsigned char discard_misaligned; |
e692cb66 | 259 | unsigned char cluster; |
98262f27 | 260 | signed char discard_zeroes_data; |
025146e1 MP |
261 | }; |
262 | ||
1da177e4 LT |
263 | struct request_queue |
264 | { | |
265 | /* | |
266 | * Together with queue_head for cacheline sharing | |
267 | */ | |
268 | struct list_head queue_head; | |
269 | struct request *last_merge; | |
b374d18a | 270 | struct elevator_queue *elevator; |
1da177e4 LT |
271 | |
272 | /* | |
273 | * the queue request freelist, one for reads and one for writes | |
274 | */ | |
275 | struct request_list rq; | |
276 | ||
277 | request_fn_proc *request_fn; | |
1da177e4 LT |
278 | make_request_fn *make_request_fn; |
279 | prep_rq_fn *prep_rq_fn; | |
28018c24 | 280 | unprep_rq_fn *unprep_rq_fn; |
1da177e4 | 281 | merge_bvec_fn *merge_bvec_fn; |
ff856bad | 282 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 283 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 284 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 285 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 286 | |
8922e16c TH |
287 | /* |
288 | * Dispatch queue sorting | |
289 | */ | |
1b47f531 | 290 | sector_t end_sector; |
8922e16c | 291 | struct request *boundary_rq; |
8922e16c | 292 | |
1da177e4 | 293 | /* |
3cca6dc1 | 294 | * Delayed queue handling |
1da177e4 | 295 | */ |
3cca6dc1 | 296 | struct delayed_work delay_work; |
1da177e4 LT |
297 | |
298 | struct backing_dev_info backing_dev_info; | |
299 | ||
300 | /* | |
301 | * The queue owner gets to use this for whatever they like. | |
302 | * ll_rw_blk doesn't touch it. | |
303 | */ | |
304 | void *queuedata; | |
305 | ||
1da177e4 LT |
306 | /* |
307 | * queue needs bounce pages for pages above this limit | |
308 | */ | |
8267e268 | 309 | gfp_t bounce_gfp; |
1da177e4 LT |
310 | |
311 | /* | |
312 | * various queue flags, see QUEUE_* below | |
313 | */ | |
314 | unsigned long queue_flags; | |
315 | ||
316 | /* | |
152587de JA |
317 | * protects queue structures from reentrancy. ->__queue_lock should |
318 | * _never_ be used directly, it is queue private. always use | |
319 | * ->queue_lock. | |
1da177e4 | 320 | */ |
152587de | 321 | spinlock_t __queue_lock; |
1da177e4 LT |
322 | spinlock_t *queue_lock; |
323 | ||
324 | /* | |
325 | * queue kobject | |
326 | */ | |
327 | struct kobject kobj; | |
328 | ||
329 | /* | |
330 | * queue settings | |
331 | */ | |
332 | unsigned long nr_requests; /* Max # of requests */ | |
333 | unsigned int nr_congestion_on; | |
334 | unsigned int nr_congestion_off; | |
335 | unsigned int nr_batching; | |
336 | ||
fa0ccd83 JB |
337 | void *dma_drain_buffer; |
338 | unsigned int dma_drain_size; | |
e3790c7d | 339 | unsigned int dma_pad_mask; |
1da177e4 LT |
340 | unsigned int dma_alignment; |
341 | ||
342 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 343 | struct list_head tag_busy_list; |
1da177e4 | 344 | |
15853af9 | 345 | unsigned int nr_sorted; |
0a7ae2ff | 346 | unsigned int in_flight[2]; |
1da177e4 | 347 | |
242f9dcb JA |
348 | unsigned int rq_timeout; |
349 | struct timer_list timeout; | |
350 | struct list_head timeout_list; | |
351 | ||
025146e1 MP |
352 | struct queue_limits limits; |
353 | ||
1da177e4 LT |
354 | /* |
355 | * sg stuff | |
356 | */ | |
357 | unsigned int sg_timeout; | |
358 | unsigned int sg_reserved_size; | |
1946089a | 359 | int node; |
6c5c9341 | 360 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 361 | struct blk_trace *blk_trace; |
6c5c9341 | 362 | #endif |
1da177e4 | 363 | /* |
4913efe4 | 364 | * for flush operations |
1da177e4 | 365 | */ |
4913efe4 | 366 | unsigned int flush_flags; |
ae1b1539 TH |
367 | unsigned int flush_pending_idx:1; |
368 | unsigned int flush_running_idx:1; | |
369 | unsigned long flush_pending_since; | |
370 | struct list_head flush_queue[2]; | |
371 | struct list_head flush_data_in_flight; | |
dd4c133f | 372 | struct request flush_rq; |
483f4afc AV |
373 | |
374 | struct mutex sysfs_lock; | |
d351af01 FT |
375 | |
376 | #if defined(CONFIG_BLK_DEV_BSG) | |
377 | struct bsg_class_device bsg_dev; | |
378 | #endif | |
e43473b7 VG |
379 | |
380 | #ifdef CONFIG_BLK_DEV_THROTTLING | |
381 | /* Throttle data */ | |
382 | struct throtl_data *td; | |
383 | #endif | |
1da177e4 LT |
384 | }; |
385 | ||
1da177e4 LT |
386 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ |
387 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
388 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
389 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
390 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
391 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
7eaceacc JA |
392 | #define QUEUE_FLAG_ELVSWITCH 7 /* don't use elevator, just do FIFO */ |
393 | #define QUEUE_FLAG_BIDI 8 /* queue supports bidi requests */ | |
394 | #define QUEUE_FLAG_NOMERGES 9 /* disable merge attempts */ | |
395 | #define QUEUE_FLAG_SAME_COMP 10 /* force complete on same CPU */ | |
396 | #define QUEUE_FLAG_FAIL_IO 11 /* fake timeout */ | |
397 | #define QUEUE_FLAG_STACKABLE 12 /* supports request stacking */ | |
398 | #define QUEUE_FLAG_NONROT 13 /* non-rotational device (SSD) */ | |
88e740f1 | 399 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 400 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 401 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 402 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 403 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
8d57a98c | 404 | #define QUEUE_FLAG_SECDISCARD 19 /* supports SECDISCARD */ |
bc58ba94 JA |
405 | |
406 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
01e97f6b | 407 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
408 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
409 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 410 | |
8f45c1a5 LT |
411 | static inline int queue_is_locked(struct request_queue *q) |
412 | { | |
7663c1e2 | 413 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
414 | spinlock_t *lock = q->queue_lock; |
415 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
416 | #else |
417 | return 1; | |
418 | #endif | |
8f45c1a5 LT |
419 | } |
420 | ||
75ad23bc NP |
421 | static inline void queue_flag_set_unlocked(unsigned int flag, |
422 | struct request_queue *q) | |
423 | { | |
424 | __set_bit(flag, &q->queue_flags); | |
425 | } | |
426 | ||
e48ec690 JA |
427 | static inline int queue_flag_test_and_clear(unsigned int flag, |
428 | struct request_queue *q) | |
429 | { | |
430 | WARN_ON_ONCE(!queue_is_locked(q)); | |
431 | ||
432 | if (test_bit(flag, &q->queue_flags)) { | |
433 | __clear_bit(flag, &q->queue_flags); | |
434 | return 1; | |
435 | } | |
436 | ||
437 | return 0; | |
438 | } | |
439 | ||
440 | static inline int queue_flag_test_and_set(unsigned int flag, | |
441 | struct request_queue *q) | |
442 | { | |
443 | WARN_ON_ONCE(!queue_is_locked(q)); | |
444 | ||
445 | if (!test_bit(flag, &q->queue_flags)) { | |
446 | __set_bit(flag, &q->queue_flags); | |
447 | return 0; | |
448 | } | |
449 | ||
450 | return 1; | |
451 | } | |
452 | ||
75ad23bc NP |
453 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
454 | { | |
8f45c1a5 | 455 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
456 | __set_bit(flag, &q->queue_flags); |
457 | } | |
458 | ||
459 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
460 | struct request_queue *q) | |
461 | { | |
462 | __clear_bit(flag, &q->queue_flags); | |
463 | } | |
464 | ||
0a7ae2ff JA |
465 | static inline int queue_in_flight(struct request_queue *q) |
466 | { | |
467 | return q->in_flight[0] + q->in_flight[1]; | |
468 | } | |
469 | ||
75ad23bc NP |
470 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
471 | { | |
8f45c1a5 | 472 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
473 | __clear_bit(flag, &q->queue_flags); |
474 | } | |
475 | ||
1da177e4 LT |
476 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) |
477 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 478 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
479 | #define blk_queue_noxmerges(q) \ |
480 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 481 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 482 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 483 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
4ee5eaf4 KU |
484 | #define blk_queue_stackable(q) \ |
485 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 486 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
8d57a98c AH |
487 | #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ |
488 | test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) | |
1da177e4 | 489 | |
33659ebb CH |
490 | #define blk_noretry_request(rq) \ |
491 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
492 | REQ_FAILFAST_DRIVER)) | |
493 | ||
494 | #define blk_account_rq(rq) \ | |
495 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
496 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
497 | ((rq)->cmd_flags & REQ_DISCARD))) | |
498 | ||
1da177e4 | 499 | #define blk_pm_request(rq) \ |
33659ebb CH |
500 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
501 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 502 | |
ab780f1e | 503 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 504 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
505 | /* rq->queuelist of dequeued request must be list_empty() */ |
506 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
507 | |
508 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
509 | ||
4aff5e23 | 510 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 511 | |
e692cb66 MP |
512 | static inline unsigned int blk_queue_cluster(struct request_queue *q) |
513 | { | |
514 | return q->limits.cluster; | |
515 | } | |
516 | ||
9e2585a8 | 517 | /* |
1faa16d2 | 518 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 519 | */ |
1faa16d2 JA |
520 | static inline bool rw_is_sync(unsigned int rw_flags) |
521 | { | |
7b6d91da | 522 | return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
1faa16d2 JA |
523 | } |
524 | ||
525 | static inline bool rq_is_sync(struct request *rq) | |
526 | { | |
527 | return rw_is_sync(rq->cmd_flags); | |
528 | } | |
529 | ||
1faa16d2 | 530 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 531 | { |
1faa16d2 JA |
532 | if (sync) |
533 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
534 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
535 | } |
536 | ||
1faa16d2 | 537 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 538 | { |
1faa16d2 JA |
539 | if (sync) |
540 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 541 | else |
1faa16d2 | 542 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
543 | } |
544 | ||
1faa16d2 | 545 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 546 | { |
1faa16d2 JA |
547 | if (sync) |
548 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 549 | else |
1faa16d2 | 550 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
551 | } |
552 | ||
553 | ||
554 | /* | |
555 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
556 | * it already be started by driver. | |
557 | */ | |
558 | #define RQ_NOMERGE_FLAGS \ | |
02e031cb | 559 | (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) |
1da177e4 | 560 | #define rq_mergeable(rq) \ |
e17fc0a1 | 561 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
562 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
563 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 564 | |
1da177e4 LT |
565 | /* |
566 | * q->prep_rq_fn return values | |
567 | */ | |
568 | #define BLKPREP_OK 0 /* serve it */ | |
569 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
570 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
571 | ||
572 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
573 | ||
574 | /* | |
575 | * standard bounce addresses: | |
576 | * | |
577 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
578 | * BLK_BOUNCE_ANY : don't bounce anything | |
579 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
580 | */ | |
2472892a AK |
581 | |
582 | #if BITS_PER_LONG == 32 | |
1da177e4 | 583 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
584 | #else |
585 | #define BLK_BOUNCE_HIGH -1ULL | |
586 | #endif | |
587 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 588 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 589 | |
3d6392cf JA |
590 | /* |
591 | * default timeout for SG_IO if none specified | |
592 | */ | |
593 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 594 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 595 | |
2a7326b5 | 596 | #ifdef CONFIG_BOUNCE |
1da177e4 | 597 | extern int init_emergency_isa_pool(void); |
165125e1 | 598 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
599 | #else |
600 | static inline int init_emergency_isa_pool(void) | |
601 | { | |
602 | return 0; | |
603 | } | |
165125e1 | 604 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
605 | { |
606 | } | |
607 | #endif /* CONFIG_MMU */ | |
608 | ||
152e283f FT |
609 | struct rq_map_data { |
610 | struct page **pages; | |
611 | int page_order; | |
612 | int nr_entries; | |
56c451f4 | 613 | unsigned long offset; |
97ae77a1 | 614 | int null_mapped; |
ecb554a8 | 615 | int from_user; |
152e283f FT |
616 | }; |
617 | ||
5705f702 N |
618 | struct req_iterator { |
619 | int i; | |
620 | struct bio *bio; | |
621 | }; | |
622 | ||
623 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
624 | #define for_each_bio(_bio) \ |
625 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 626 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
627 | if ((rq->bio)) \ |
628 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
629 | ||
5705f702 N |
630 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
631 | __rq_for_each_bio(_iter.bio, _rq) \ | |
632 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
633 | ||
634 | #define rq_iter_last(rq, _iter) \ | |
635 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
636 | ||
2d4dc890 IL |
637 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
638 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
639 | #endif | |
640 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
641 | extern void rq_flush_dcache_pages(struct request *rq); | |
642 | #else | |
643 | static inline void rq_flush_dcache_pages(struct request *rq) | |
644 | { | |
645 | } | |
646 | #endif | |
647 | ||
1da177e4 LT |
648 | extern int blk_register_queue(struct gendisk *disk); |
649 | extern void blk_unregister_queue(struct gendisk *disk); | |
1da177e4 | 650 | extern void generic_make_request(struct bio *bio); |
2a4aa30c | 651 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 652 | extern void blk_put_request(struct request *); |
165125e1 | 653 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 654 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
655 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
656 | gfp_t); | |
165125e1 JA |
657 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
658 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
66ac0280 CH |
659 | extern void blk_add_request_payload(struct request *rq, struct page *page, |
660 | unsigned int len); | |
82124d60 | 661 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 662 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
663 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
664 | struct bio_set *bs, gfp_t gfp_mask, | |
665 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
666 | void *data); | |
667 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
668 | extern int blk_insert_cloned_request(struct request_queue *q, |
669 | struct request *rq); | |
3cca6dc1 | 670 | extern void blk_delay_queue(struct request_queue *, unsigned long); |
165125e1 | 671 | extern void blk_recount_segments(struct request_queue *, struct bio *); |
74f3c8af AV |
672 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
673 | unsigned int, void __user *); | |
e915e872 AV |
674 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
675 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
676 | |
677 | /* | |
678 | * A queue has just exitted congestion. Note this in the global counter of | |
679 | * congested queues, and wake up anyone who was waiting for requests to be | |
680 | * put back. | |
681 | */ | |
8aa7e847 | 682 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 683 | { |
8aa7e847 | 684 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
685 | } |
686 | ||
687 | /* | |
688 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
689 | * state flags and increment the global gounter of congested queues. | |
690 | */ | |
8aa7e847 | 691 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 692 | { |
8aa7e847 | 693 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
694 | } |
695 | ||
165125e1 JA |
696 | extern void blk_start_queue(struct request_queue *q); |
697 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 698 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 699 | extern void __blk_stop_queue(struct request_queue *q); |
1654e741 | 700 | extern void __blk_run_queue(struct request_queue *q, bool force_kblockd); |
165125e1 | 701 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 702 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
703 | struct rq_map_data *, void __user *, unsigned long, |
704 | gfp_t); | |
8e5cfc45 | 705 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
706 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
707 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
708 | struct rq_map_data *, struct sg_iovec *, int, |
709 | unsigned int, gfp_t); | |
165125e1 | 710 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 711 | struct request *, int); |
165125e1 | 712 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 713 | struct request *, int, rq_end_io_fn *); |
6e39b69e | 714 | |
165125e1 | 715 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
716 | { |
717 | return bdev->bd_disk->queue; | |
718 | } | |
719 | ||
5efccd17 | 720 | /* |
80a761fd TH |
721 | * blk_rq_pos() : the current sector |
722 | * blk_rq_bytes() : bytes left in the entire request | |
723 | * blk_rq_cur_bytes() : bytes left in the current segment | |
724 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
725 | * blk_rq_sectors() : sectors left in the entire request | |
726 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 727 | */ |
5b93629b TH |
728 | static inline sector_t blk_rq_pos(const struct request *rq) |
729 | { | |
a2dec7b3 | 730 | return rq->__sector; |
2e46e8b2 TH |
731 | } |
732 | ||
733 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
734 | { | |
a2dec7b3 | 735 | return rq->__data_len; |
5b93629b TH |
736 | } |
737 | ||
2e46e8b2 TH |
738 | static inline int blk_rq_cur_bytes(const struct request *rq) |
739 | { | |
740 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
741 | } | |
5efccd17 | 742 | |
80a761fd TH |
743 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
744 | ||
5b93629b TH |
745 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
746 | { | |
2e46e8b2 | 747 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
748 | } |
749 | ||
750 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
751 | { | |
2e46e8b2 | 752 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
753 | } |
754 | ||
9934c8c0 TH |
755 | /* |
756 | * Request issue related functions. | |
757 | */ | |
758 | extern struct request *blk_peek_request(struct request_queue *q); | |
759 | extern void blk_start_request(struct request *rq); | |
760 | extern struct request *blk_fetch_request(struct request_queue *q); | |
761 | ||
1da177e4 | 762 | /* |
2e60e022 TH |
763 | * Request completion related functions. |
764 | * | |
765 | * blk_update_request() completes given number of bytes and updates | |
766 | * the request without completing it. | |
767 | * | |
f06d9a2b TH |
768 | * blk_end_request() and friends. __blk_end_request() must be called |
769 | * with the request queue spinlock acquired. | |
1da177e4 LT |
770 | * |
771 | * Several drivers define their own end_request and call | |
3bcddeac KU |
772 | * blk_end_request() for parts of the original function. |
773 | * This prevents code duplication in drivers. | |
1da177e4 | 774 | */ |
2e60e022 TH |
775 | extern bool blk_update_request(struct request *rq, int error, |
776 | unsigned int nr_bytes); | |
b1f74493 FT |
777 | extern bool blk_end_request(struct request *rq, int error, |
778 | unsigned int nr_bytes); | |
779 | extern void blk_end_request_all(struct request *rq, int error); | |
780 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 781 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
782 | extern bool __blk_end_request(struct request *rq, int error, |
783 | unsigned int nr_bytes); | |
784 | extern void __blk_end_request_all(struct request *rq, int error); | |
785 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 786 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 787 | |
ff856bad | 788 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
789 | extern void __blk_complete_request(struct request *); |
790 | extern void blk_abort_request(struct request *); | |
11914a53 | 791 | extern void blk_abort_queue(struct request_queue *); |
28018c24 | 792 | extern void blk_unprep_request(struct request *); |
ff856bad | 793 | |
1da177e4 LT |
794 | /* |
795 | * Access functions for manipulating queue properties | |
796 | */ | |
165125e1 | 797 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 798 | spinlock_t *lock, int node_id); |
01effb0d MS |
799 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
800 | request_fn_proc *, | |
801 | spinlock_t *, int node_id); | |
165125e1 | 802 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
803 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
804 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
805 | extern void blk_cleanup_queue(struct request_queue *); |
806 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
807 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
72d4cd9f | 808 | extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
086fa5ff | 809 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 810 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 811 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
812 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
813 | unsigned int max_discard_sectors); | |
e1defc4f | 814 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
892b6f90 | 815 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); |
c72758f3 MP |
816 | extern void blk_queue_alignment_offset(struct request_queue *q, |
817 | unsigned int alignment); | |
7c958e32 | 818 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 819 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 820 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 821 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 822 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
823 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
824 | sector_t offset); | |
17be8c24 MP |
825 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
826 | sector_t offset); | |
c72758f3 MP |
827 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
828 | sector_t offset); | |
165125e1 | 829 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 830 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 831 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
832 | extern int blk_queue_dma_drain(struct request_queue *q, |
833 | dma_drain_needed_fn *dma_drain_needed, | |
834 | void *buf, unsigned int size); | |
ef9e3fac | 835 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
836 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
837 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
28018c24 | 838 | extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); |
165125e1 JA |
839 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); |
840 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 841 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 842 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
843 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
844 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
4913efe4 | 845 | extern void blk_queue_flush(struct request_queue *q, unsigned int flush); |
1da177e4 | 846 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
1da177e4 | 847 | |
165125e1 | 848 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 849 | extern void blk_dump_rq_flags(struct request *, char *); |
1da177e4 | 850 | extern long nr_blockdev_pages(void); |
1da177e4 | 851 | |
165125e1 JA |
852 | int blk_get_queue(struct request_queue *); |
853 | struct request_queue *blk_alloc_queue(gfp_t); | |
854 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
855 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 | 856 | |
73c10101 JA |
857 | struct blk_plug { |
858 | unsigned long magic; | |
859 | struct list_head list; | |
860 | unsigned int should_sort; | |
861 | }; | |
862 | ||
863 | extern void blk_start_plug(struct blk_plug *); | |
864 | extern void blk_finish_plug(struct blk_plug *); | |
865 | extern void __blk_flush_plug(struct task_struct *, struct blk_plug *); | |
866 | ||
867 | static inline void blk_flush_plug(struct task_struct *tsk) | |
868 | { | |
869 | struct blk_plug *plug = tsk->plug; | |
870 | ||
871 | if (unlikely(plug)) | |
872 | __blk_flush_plug(tsk, plug); | |
873 | } | |
874 | ||
875 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
876 | { | |
877 | struct blk_plug *plug = tsk->plug; | |
878 | ||
879 | return plug && !list_empty(&plug->list); | |
880 | } | |
881 | ||
1da177e4 LT |
882 | /* |
883 | * tag stuff | |
884 | */ | |
4aff5e23 | 885 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
886 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
887 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
888 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
889 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
890 | extern void blk_queue_free_tags(struct request_queue *); | |
891 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
892 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
893 | extern struct blk_queue_tag *blk_init_tags(int); |
894 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 895 | |
f583f492 DS |
896 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
897 | int tag) | |
898 | { | |
899 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
900 | return NULL; | |
901 | return bqt->tag_index[tag]; | |
902 | } | |
dd3932ed CH |
903 | |
904 | #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ | |
905 | ||
906 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); | |
fbd9b09a DM |
907 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, |
908 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 | 909 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
dd3932ed | 910 | sector_t nr_sects, gfp_t gfp_mask); |
2cf6d26a CH |
911 | static inline int sb_issue_discard(struct super_block *sb, sector_t block, |
912 | sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) | |
fb2dce86 | 913 | { |
2cf6d26a CH |
914 | return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), |
915 | nr_blocks << (sb->s_blocksize_bits - 9), | |
916 | gfp_mask, flags); | |
fb2dce86 | 917 | } |
e6fa0be6 | 918 | static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, |
a107e5a3 | 919 | sector_t nr_blocks, gfp_t gfp_mask) |
e6fa0be6 LC |
920 | { |
921 | return blkdev_issue_zeroout(sb->s_bdev, | |
922 | block << (sb->s_blocksize_bits - 9), | |
923 | nr_blocks << (sb->s_blocksize_bits - 9), | |
a107e5a3 | 924 | gfp_mask); |
e6fa0be6 | 925 | } |
1da177e4 | 926 | |
018e0446 | 927 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 928 | |
eb28d31b MP |
929 | enum blk_default_limits { |
930 | BLK_MAX_SEGMENTS = 128, | |
931 | BLK_SAFE_MAX_SECTORS = 255, | |
932 | BLK_DEF_MAX_SECTORS = 1024, | |
933 | BLK_MAX_SEGMENT_SIZE = 65536, | |
934 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
935 | }; | |
0e435ac2 | 936 | |
1da177e4 LT |
937 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
938 | ||
ae03bf63 MP |
939 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
940 | { | |
025146e1 | 941 | return q->limits.bounce_pfn; |
ae03bf63 MP |
942 | } |
943 | ||
944 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
945 | { | |
025146e1 | 946 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
947 | } |
948 | ||
949 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
950 | { | |
025146e1 | 951 | return q->limits.max_sectors; |
ae03bf63 MP |
952 | } |
953 | ||
954 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
955 | { | |
025146e1 | 956 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
957 | } |
958 | ||
8a78362c | 959 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 960 | { |
8a78362c | 961 | return q->limits.max_segments; |
ae03bf63 MP |
962 | } |
963 | ||
964 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
965 | { | |
025146e1 | 966 | return q->limits.max_segment_size; |
ae03bf63 MP |
967 | } |
968 | ||
e1defc4f | 969 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
970 | { |
971 | int retval = 512; | |
972 | ||
025146e1 MP |
973 | if (q && q->limits.logical_block_size) |
974 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
975 | |
976 | return retval; | |
977 | } | |
978 | ||
e1defc4f | 979 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 980 | { |
e1defc4f | 981 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
982 | } |
983 | ||
c72758f3 MP |
984 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
985 | { | |
986 | return q->limits.physical_block_size; | |
987 | } | |
988 | ||
892b6f90 | 989 | static inline unsigned int bdev_physical_block_size(struct block_device *bdev) |
ac481c20 MP |
990 | { |
991 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
992 | } | |
993 | ||
c72758f3 MP |
994 | static inline unsigned int queue_io_min(struct request_queue *q) |
995 | { | |
996 | return q->limits.io_min; | |
997 | } | |
998 | ||
ac481c20 MP |
999 | static inline int bdev_io_min(struct block_device *bdev) |
1000 | { | |
1001 | return queue_io_min(bdev_get_queue(bdev)); | |
1002 | } | |
1003 | ||
c72758f3 MP |
1004 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1005 | { | |
1006 | return q->limits.io_opt; | |
1007 | } | |
1008 | ||
ac481c20 MP |
1009 | static inline int bdev_io_opt(struct block_device *bdev) |
1010 | { | |
1011 | return queue_io_opt(bdev_get_queue(bdev)); | |
1012 | } | |
1013 | ||
c72758f3 MP |
1014 | static inline int queue_alignment_offset(struct request_queue *q) |
1015 | { | |
ac481c20 | 1016 | if (q->limits.misaligned) |
c72758f3 MP |
1017 | return -1; |
1018 | ||
ac481c20 | 1019 | return q->limits.alignment_offset; |
c72758f3 MP |
1020 | } |
1021 | ||
e03a72e1 | 1022 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1023 | { |
1024 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1025 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1026 | |
e03a72e1 MP |
1027 | return (granularity + lim->alignment_offset - alignment) |
1028 | & (granularity - 1); | |
c72758f3 MP |
1029 | } |
1030 | ||
ac481c20 MP |
1031 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1032 | { | |
1033 | struct request_queue *q = bdev_get_queue(bdev); | |
1034 | ||
1035 | if (q->limits.misaligned) | |
1036 | return -1; | |
1037 | ||
1038 | if (bdev != bdev->bd_contains) | |
1039 | return bdev->bd_part->alignment_offset; | |
1040 | ||
1041 | return q->limits.alignment_offset; | |
1042 | } | |
1043 | ||
86b37281 MP |
1044 | static inline int queue_discard_alignment(struct request_queue *q) |
1045 | { | |
1046 | if (q->limits.discard_misaligned) | |
1047 | return -1; | |
1048 | ||
1049 | return q->limits.discard_alignment; | |
1050 | } | |
1051 | ||
e03a72e1 | 1052 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1053 | { |
dd3d145d MP |
1054 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1055 | ||
1056 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1057 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1058 | } |
1059 | ||
98262f27 MP |
1060 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1061 | { | |
1062 | if (q->limits.discard_zeroes_data == 1) | |
1063 | return 1; | |
1064 | ||
1065 | return 0; | |
1066 | } | |
1067 | ||
1068 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1069 | { | |
1070 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1071 | } | |
1072 | ||
165125e1 | 1073 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1074 | { |
482eb689 | 1075 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1076 | } |
1077 | ||
14417799 | 1078 | static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, |
87904074 FT |
1079 | unsigned int len) |
1080 | { | |
1081 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
14417799 | 1082 | return !(addr & alignment) && !(len & alignment); |
87904074 FT |
1083 | } |
1084 | ||
1da177e4 LT |
1085 | /* assumes size > 256 */ |
1086 | static inline unsigned int blksize_bits(unsigned int size) | |
1087 | { | |
1088 | unsigned int bits = 8; | |
1089 | do { | |
1090 | bits++; | |
1091 | size >>= 1; | |
1092 | } while (size > 256); | |
1093 | return bits; | |
1094 | } | |
1095 | ||
2befb9e3 | 1096 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1097 | { |
1098 | return bdev->bd_block_size; | |
1099 | } | |
1100 | ||
1101 | typedef struct {struct page *v;} Sector; | |
1102 | ||
1103 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1104 | ||
1105 | static inline void put_dev_sector(Sector p) | |
1106 | { | |
1107 | page_cache_release(p.v); | |
1108 | } | |
1109 | ||
1110 | struct work_struct; | |
18887ad9 | 1111 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1112 | |
9195291e | 1113 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1114 | /* |
1115 | * This should not be using sched_clock(). A real patch is in progress | |
1116 | * to fix this up, until that is in place we need to disable preemption | |
1117 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1118 | */ | |
9195291e DS |
1119 | static inline void set_start_time_ns(struct request *req) |
1120 | { | |
28f4197e | 1121 | preempt_disable(); |
9195291e | 1122 | req->start_time_ns = sched_clock(); |
28f4197e | 1123 | preempt_enable(); |
9195291e DS |
1124 | } |
1125 | ||
1126 | static inline void set_io_start_time_ns(struct request *req) | |
1127 | { | |
28f4197e | 1128 | preempt_disable(); |
9195291e | 1129 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1130 | preempt_enable(); |
9195291e | 1131 | } |
84c124da DS |
1132 | |
1133 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1134 | { | |
1135 | return req->start_time_ns; | |
1136 | } | |
1137 | ||
1138 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1139 | { | |
1140 | return req->io_start_time_ns; | |
1141 | } | |
9195291e DS |
1142 | #else |
1143 | static inline void set_start_time_ns(struct request *req) {} | |
1144 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1145 | static inline uint64_t rq_start_time_ns(struct request *req) |
1146 | { | |
1147 | return 0; | |
1148 | } | |
1149 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1150 | { | |
1151 | return 0; | |
1152 | } | |
9195291e DS |
1153 | #endif |
1154 | ||
e43473b7 VG |
1155 | #ifdef CONFIG_BLK_DEV_THROTTLING |
1156 | extern int blk_throtl_init(struct request_queue *q); | |
1157 | extern void blk_throtl_exit(struct request_queue *q); | |
1158 | extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); | |
e43473b7 VG |
1159 | #else /* CONFIG_BLK_DEV_THROTTLING */ |
1160 | static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) | |
1161 | { | |
1162 | return 0; | |
1163 | } | |
1164 | ||
1165 | static inline int blk_throtl_init(struct request_queue *q) { return 0; } | |
1166 | static inline int blk_throtl_exit(struct request_queue *q) { return 0; } | |
e43473b7 VG |
1167 | #endif /* CONFIG_BLK_DEV_THROTTLING */ |
1168 | ||
1da177e4 LT |
1169 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1170 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1171 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1172 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1173 | ||
7ba1ba12 MP |
1174 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1175 | ||
b24498d4 JA |
1176 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1177 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1178 | |
1179 | struct blk_integrity_exchg { | |
1180 | void *prot_buf; | |
1181 | void *data_buf; | |
1182 | sector_t sector; | |
1183 | unsigned int data_size; | |
1184 | unsigned short sector_size; | |
1185 | const char *disk_name; | |
1186 | }; | |
1187 | ||
1188 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1189 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1190 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1191 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1192 | ||
1193 | struct blk_integrity { | |
1194 | integrity_gen_fn *generate_fn; | |
1195 | integrity_vrfy_fn *verify_fn; | |
1196 | integrity_set_tag_fn *set_tag_fn; | |
1197 | integrity_get_tag_fn *get_tag_fn; | |
1198 | ||
1199 | unsigned short flags; | |
1200 | unsigned short tuple_size; | |
1201 | unsigned short sector_size; | |
1202 | unsigned short tag_size; | |
1203 | ||
1204 | const char *name; | |
1205 | ||
1206 | struct kobject kobj; | |
1207 | }; | |
1208 | ||
1209 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1210 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1211 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
13f05c8d MP |
1212 | extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, |
1213 | struct scatterlist *); | |
1214 | extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); | |
1215 | extern int blk_integrity_merge_rq(struct request_queue *, struct request *, | |
1216 | struct request *); | |
1217 | extern int blk_integrity_merge_bio(struct request_queue *, struct request *, | |
1218 | struct bio *); | |
7ba1ba12 | 1219 | |
b04accc4 JA |
1220 | static inline |
1221 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1222 | { | |
1223 | return bdev->bd_disk->integrity; | |
1224 | } | |
1225 | ||
b02739b0 MP |
1226 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1227 | { | |
1228 | return disk->integrity; | |
1229 | } | |
1230 | ||
7ba1ba12 MP |
1231 | static inline int blk_integrity_rq(struct request *rq) |
1232 | { | |
d442cc44 MP |
1233 | if (rq->bio == NULL) |
1234 | return 0; | |
1235 | ||
7ba1ba12 MP |
1236 | return bio_integrity(rq->bio); |
1237 | } | |
1238 | ||
13f05c8d MP |
1239 | static inline void blk_queue_max_integrity_segments(struct request_queue *q, |
1240 | unsigned int segs) | |
1241 | { | |
1242 | q->limits.max_integrity_segments = segs; | |
1243 | } | |
1244 | ||
1245 | static inline unsigned short | |
1246 | queue_max_integrity_segments(struct request_queue *q) | |
1247 | { | |
1248 | return q->limits.max_integrity_segments; | |
1249 | } | |
1250 | ||
7ba1ba12 MP |
1251 | #else /* CONFIG_BLK_DEV_INTEGRITY */ |
1252 | ||
1253 | #define blk_integrity_rq(rq) (0) | |
13f05c8d MP |
1254 | #define blk_rq_count_integrity_sg(a, b) (0) |
1255 | #define blk_rq_map_integrity_sg(a, b, c) (0) | |
b04accc4 | 1256 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1257 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1258 | #define blk_integrity_compare(a, b) (0) |
1259 | #define blk_integrity_register(a, b) (0) | |
1260 | #define blk_integrity_unregister(a) do { } while (0); | |
13f05c8d MP |
1261 | #define blk_queue_max_integrity_segments(a, b) do { } while (0); |
1262 | #define queue_max_integrity_segments(a) (0) | |
1263 | #define blk_integrity_merge_rq(a, b, c) (0) | |
1264 | #define blk_integrity_merge_bio(a, b, c) (0) | |
7ba1ba12 MP |
1265 | |
1266 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1267 | ||
08f85851 | 1268 | struct block_device_operations { |
d4430d62 AV |
1269 | int (*open) (struct block_device *, fmode_t); |
1270 | int (*release) (struct gendisk *, fmode_t); | |
d4430d62 AV |
1271 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
1272 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1273 | int (*direct_access) (struct block_device *, sector_t, |
1274 | void **, unsigned long *); | |
77ea887e TH |
1275 | unsigned int (*check_events) (struct gendisk *disk, |
1276 | unsigned int clearing); | |
1277 | /* ->media_changed() is DEPRECATED, use ->check_events() instead */ | |
08f85851 | 1278 | int (*media_changed) (struct gendisk *); |
c3e33e04 | 1279 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1280 | int (*revalidate_disk) (struct gendisk *); |
1281 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1282 | /* this callback is with swap_lock and sometimes page table lock held */ |
1283 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1284 | struct module *owner; |
1285 | }; | |
1286 | ||
633a08b8 AV |
1287 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1288 | unsigned long); | |
9361401e DH |
1289 | #else /* CONFIG_BLOCK */ |
1290 | /* | |
1291 | * stubs for when the block layer is configured out | |
1292 | */ | |
1293 | #define buffer_heads_over_limit 0 | |
1294 | ||
9361401e DH |
1295 | static inline long nr_blockdev_pages(void) |
1296 | { | |
1297 | return 0; | |
1298 | } | |
1299 | ||
73c10101 JA |
1300 | static inline void blk_start_plug(struct list_head *list) |
1301 | { | |
1302 | } | |
1303 | ||
1304 | static inline void blk_finish_plug(struct list_head *list) | |
1305 | { | |
1306 | } | |
1307 | ||
1308 | static inline void blk_flush_plug(struct task_struct *tsk) | |
1309 | { | |
1310 | } | |
1311 | ||
1312 | static inline bool blk_needs_flush_plug(struct task_struct *tsk) | |
1313 | { | |
1314 | return false; | |
1315 | } | |
1316 | ||
9361401e DH |
1317 | #endif /* CONFIG_BLOCK */ |
1318 | ||
1da177e4 | 1319 | #endif |