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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 LT |
28 | struct elevator_queue; |
29 | typedef struct elevator_queue elevator_t; | |
30 | struct request_pm_state; | |
2056a782 | 31 | struct blk_trace; |
3d6392cf JA |
32 | struct request; |
33 | struct sg_io_hdr; | |
1da177e4 LT |
34 | |
35 | #define BLKDEV_MIN_RQ 4 | |
36 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
37 | ||
1da177e4 | 38 | struct request; |
8ffdc655 | 39 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
40 | |
41 | struct request_list { | |
42 | int count[2]; | |
43 | int starved[2]; | |
cb98fc8b | 44 | int elvpriv; |
1da177e4 LT |
45 | mempool_t *rq_pool; |
46 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
47 | }; |
48 | ||
4aff5e23 JA |
49 | /* |
50 | * request command types | |
51 | */ | |
52 | enum rq_cmd_type_bits { | |
53 | REQ_TYPE_FS = 1, /* fs request */ | |
54 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
55 | REQ_TYPE_SENSE, /* sense request */ | |
56 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
57 | REQ_TYPE_PM_RESUME, /* resume request */ | |
58 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 JA |
59 | REQ_TYPE_SPECIAL, /* driver defined type */ |
60 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
61 | /* | |
62 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
63 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
64 | * private REQ_LB opcodes to differentiate what type of request this is | |
65 | */ | |
4aff5e23 | 66 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 67 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
68 | }; |
69 | ||
70 | /* | |
71 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
72 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
73 | * SCSI cdb. | |
74 | * | |
75 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
76 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
77 | * | |
78 | */ | |
79 | enum { | |
4aff5e23 | 80 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
1a8e2bdd | 81 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
eae9acd1 | 82 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
4aff5e23 JA |
83 | }; |
84 | ||
85 | /* | |
d628eaef | 86 | * request type modified bits. first two bits match BIO_RW* bits, important |
4aff5e23 JA |
87 | */ |
88 | enum rq_flag_bits { | |
89 | __REQ_RW, /* not set, read. set, write */ | |
90 | __REQ_FAILFAST, /* no low level driver retries */ | |
fb2dce86 | 91 | __REQ_DISCARD, /* request to discard sectors */ |
4aff5e23 JA |
92 | __REQ_SORTED, /* elevator knows about this request */ |
93 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
94 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
95 | __REQ_FUA, /* forced unit access */ | |
96 | __REQ_NOMERGE, /* don't touch this for merging */ | |
97 | __REQ_STARTED, /* drive already may have started this one */ | |
98 | __REQ_DONTPREP, /* don't call prep for this one */ | |
99 | __REQ_QUEUED, /* uses queueing */ | |
100 | __REQ_ELVPRIV, /* elevator private data attached */ | |
101 | __REQ_FAILED, /* set if the request failed */ | |
102 | __REQ_QUIET, /* don't worry about errors */ | |
103 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
104 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
105 | __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ | |
49171e5c | 106 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 107 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 108 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 109 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
4aff5e23 JA |
110 | __REQ_NR_BITS, /* stops here */ |
111 | }; | |
112 | ||
113 | #define REQ_RW (1 << __REQ_RW) | |
fb2dce86 | 114 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
4aff5e23 JA |
115 | #define REQ_FAILFAST (1 << __REQ_FAILFAST) |
116 | #define REQ_SORTED (1 << __REQ_SORTED) | |
117 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
118 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
119 | #define REQ_FUA (1 << __REQ_FUA) | |
120 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
121 | #define REQ_STARTED (1 << __REQ_STARTED) | |
122 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
123 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
124 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
125 | #define REQ_FAILED (1 << __REQ_FAILED) | |
126 | #define REQ_QUIET (1 << __REQ_QUIET) | |
127 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
128 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
129 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 130 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 131 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 132 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 133 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
4aff5e23 | 134 | |
1da177e4 LT |
135 | #define BLK_MAX_CDB 16 |
136 | ||
137 | /* | |
63a71386 JA |
138 | * try to put the fields that are referenced together in the same cacheline. |
139 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
140 | * as well! | |
1da177e4 LT |
141 | */ |
142 | struct request { | |
ff856bad | 143 | struct list_head queuelist; |
c7c22e4d JA |
144 | struct call_single_data csd; |
145 | int cpu; | |
ff856bad | 146 | |
165125e1 | 147 | struct request_queue *q; |
e6a1c874 | 148 | |
4aff5e23 JA |
149 | unsigned int cmd_flags; |
150 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 151 | unsigned long atomic_flags; |
1da177e4 LT |
152 | |
153 | /* Maintain bio traversal state for part by part I/O submission. | |
154 | * hard_* are block layer internals, no driver should touch them! | |
155 | */ | |
156 | ||
157 | sector_t sector; /* next sector to submit */ | |
e6a1c874 | 158 | sector_t hard_sector; /* next sector to complete */ |
1da177e4 | 159 | unsigned long nr_sectors; /* no. of sectors left to submit */ |
e6a1c874 | 160 | unsigned long hard_nr_sectors; /* no. of sectors left to complete */ |
1da177e4 LT |
161 | /* no. of sectors left to submit in the current segment */ |
162 | unsigned int current_nr_sectors; | |
163 | ||
1da177e4 LT |
164 | /* no. of sectors left to complete in the current segment */ |
165 | unsigned int hard_cur_sectors; | |
166 | ||
167 | struct bio *bio; | |
168 | struct bio *biotail; | |
169 | ||
9817064b | 170 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
171 | /* |
172 | * The rb_node is only used inside the io scheduler, requests | |
173 | * are pruned when moved to the dispatch queue. So let the | |
174 | * completion_data share space with the rb_node. | |
175 | */ | |
176 | union { | |
177 | struct rb_node rb_node; /* sort/lookup */ | |
178 | void *completion_data; | |
179 | }; | |
9817064b | 180 | |
ff7d145f JA |
181 | /* |
182 | * two pointers are available for the IO schedulers, if they need | |
183 | * more they have to dynamically allocate it. | |
184 | */ | |
1da177e4 | 185 | void *elevator_private; |
ff7d145f JA |
186 | void *elevator_private2; |
187 | ||
8f34ee75 | 188 | struct gendisk *rq_disk; |
1da177e4 LT |
189 | unsigned long start_time; |
190 | ||
191 | /* Number of scatter-gather DMA addr+len pairs after | |
192 | * physical address coalescing is performed. | |
193 | */ | |
194 | unsigned short nr_phys_segments; | |
195 | ||
8f34ee75 JA |
196 | unsigned short ioprio; |
197 | ||
1da177e4 | 198 | void *special; |
8f34ee75 | 199 | char *buffer; |
1da177e4 | 200 | |
cdd60262 JA |
201 | int tag; |
202 | int errors; | |
203 | ||
204 | int ref_count; | |
205 | ||
1da177e4 LT |
206 | /* |
207 | * when request is used as a packet command carrier | |
208 | */ | |
d7e3c324 FT |
209 | unsigned short cmd_len; |
210 | unsigned char __cmd[BLK_MAX_CDB]; | |
211 | unsigned char *cmd; | |
1da177e4 LT |
212 | |
213 | unsigned int data_len; | |
7a85f889 | 214 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 215 | unsigned int sense_len; |
8f34ee75 | 216 | void *data; |
1da177e4 LT |
217 | void *sense; |
218 | ||
242f9dcb JA |
219 | unsigned long deadline; |
220 | struct list_head timeout_list; | |
1da177e4 | 221 | unsigned int timeout; |
17e01f21 | 222 | int retries; |
1da177e4 | 223 | |
1da177e4 | 224 | /* |
c00895ab | 225 | * completion callback. |
1da177e4 LT |
226 | */ |
227 | rq_end_io_fn *end_io; | |
228 | void *end_io_data; | |
abae1fde FT |
229 | |
230 | /* for bidi */ | |
231 | struct request *next_rq; | |
1da177e4 LT |
232 | }; |
233 | ||
766ca442 FLVC |
234 | static inline unsigned short req_get_ioprio(struct request *req) |
235 | { | |
236 | return req->ioprio; | |
237 | } | |
238 | ||
1da177e4 | 239 | /* |
4aff5e23 | 240 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
241 | * requests. Some step values could eventually be made generic. |
242 | */ | |
243 | struct request_pm_state | |
244 | { | |
245 | /* PM state machine step value, currently driver specific */ | |
246 | int pm_step; | |
247 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
248 | u32 pm_state; | |
249 | void* data; /* for driver use */ | |
250 | }; | |
251 | ||
252 | #include <linux/elevator.h> | |
253 | ||
165125e1 JA |
254 | typedef void (request_fn_proc) (struct request_queue *q); |
255 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
256 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
257 | typedef void (unplug_fn) (struct request_queue *); | |
fb2dce86 | 258 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
259 | |
260 | struct bio_vec; | |
cc371e66 AK |
261 | struct bvec_merge_data { |
262 | struct block_device *bi_bdev; | |
263 | sector_t bi_sector; | |
264 | unsigned bi_size; | |
265 | unsigned long bi_rw; | |
266 | }; | |
267 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
268 | struct bio_vec *); | |
165125e1 | 269 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 270 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 271 | typedef int (dma_drain_needed_fn)(struct request *); |
1da177e4 | 272 | |
242f9dcb JA |
273 | enum blk_eh_timer_return { |
274 | BLK_EH_NOT_HANDLED, | |
275 | BLK_EH_HANDLED, | |
276 | BLK_EH_RESET_TIMER, | |
277 | }; | |
278 | ||
279 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
280 | ||
1da177e4 LT |
281 | enum blk_queue_state { |
282 | Queue_down, | |
283 | Queue_up, | |
284 | }; | |
285 | ||
1da177e4 LT |
286 | struct blk_queue_tag { |
287 | struct request **tag_index; /* map of busy tags */ | |
288 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
289 | int busy; /* current depth */ |
290 | int max_depth; /* what we will send to device */ | |
ba025082 | 291 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
292 | atomic_t refcnt; /* map can be shared */ |
293 | }; | |
294 | ||
abf54393 FT |
295 | #define BLK_SCSI_MAX_CMDS (256) |
296 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
297 | ||
4beab5c6 | 298 | struct blk_cmd_filter { |
abf54393 FT |
299 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
300 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
301 | struct kobject kobj; | |
302 | }; | |
303 | ||
1da177e4 LT |
304 | struct request_queue |
305 | { | |
306 | /* | |
307 | * Together with queue_head for cacheline sharing | |
308 | */ | |
309 | struct list_head queue_head; | |
310 | struct request *last_merge; | |
311 | elevator_t *elevator; | |
312 | ||
313 | /* | |
314 | * the queue request freelist, one for reads and one for writes | |
315 | */ | |
316 | struct request_list rq; | |
317 | ||
318 | request_fn_proc *request_fn; | |
1da177e4 LT |
319 | make_request_fn *make_request_fn; |
320 | prep_rq_fn *prep_rq_fn; | |
321 | unplug_fn *unplug_fn; | |
fb2dce86 | 322 | prepare_discard_fn *prepare_discard_fn; |
1da177e4 | 323 | merge_bvec_fn *merge_bvec_fn; |
1da177e4 | 324 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 325 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 326 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 327 | dma_drain_needed_fn *dma_drain_needed; |
1da177e4 | 328 | |
8922e16c TH |
329 | /* |
330 | * Dispatch queue sorting | |
331 | */ | |
1b47f531 | 332 | sector_t end_sector; |
8922e16c | 333 | struct request *boundary_rq; |
8922e16c | 334 | |
1da177e4 LT |
335 | /* |
336 | * Auto-unplugging state | |
337 | */ | |
338 | struct timer_list unplug_timer; | |
339 | int unplug_thresh; /* After this many requests */ | |
340 | unsigned long unplug_delay; /* After this many jiffies */ | |
341 | struct work_struct unplug_work; | |
342 | ||
343 | struct backing_dev_info backing_dev_info; | |
344 | ||
345 | /* | |
346 | * The queue owner gets to use this for whatever they like. | |
347 | * ll_rw_blk doesn't touch it. | |
348 | */ | |
349 | void *queuedata; | |
350 | ||
1da177e4 LT |
351 | /* |
352 | * queue needs bounce pages for pages above this limit | |
353 | */ | |
354 | unsigned long bounce_pfn; | |
8267e268 | 355 | gfp_t bounce_gfp; |
1da177e4 LT |
356 | |
357 | /* | |
358 | * various queue flags, see QUEUE_* below | |
359 | */ | |
360 | unsigned long queue_flags; | |
361 | ||
362 | /* | |
152587de JA |
363 | * protects queue structures from reentrancy. ->__queue_lock should |
364 | * _never_ be used directly, it is queue private. always use | |
365 | * ->queue_lock. | |
1da177e4 | 366 | */ |
152587de | 367 | spinlock_t __queue_lock; |
1da177e4 LT |
368 | spinlock_t *queue_lock; |
369 | ||
370 | /* | |
371 | * queue kobject | |
372 | */ | |
373 | struct kobject kobj; | |
374 | ||
375 | /* | |
376 | * queue settings | |
377 | */ | |
378 | unsigned long nr_requests; /* Max # of requests */ | |
379 | unsigned int nr_congestion_on; | |
380 | unsigned int nr_congestion_off; | |
381 | unsigned int nr_batching; | |
382 | ||
2cb2e147 JA |
383 | unsigned int max_sectors; |
384 | unsigned int max_hw_sectors; | |
1da177e4 LT |
385 | unsigned short max_phys_segments; |
386 | unsigned short max_hw_segments; | |
387 | unsigned short hardsect_size; | |
388 | unsigned int max_segment_size; | |
389 | ||
390 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
391 | void *dma_drain_buffer; |
392 | unsigned int dma_drain_size; | |
e3790c7d | 393 | unsigned int dma_pad_mask; |
1da177e4 LT |
394 | unsigned int dma_alignment; |
395 | ||
396 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 397 | struct list_head tag_busy_list; |
1da177e4 | 398 | |
15853af9 | 399 | unsigned int nr_sorted; |
1da177e4 LT |
400 | unsigned int in_flight; |
401 | ||
242f9dcb JA |
402 | unsigned int rq_timeout; |
403 | struct timer_list timeout; | |
404 | struct list_head timeout_list; | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * sg stuff | |
408 | */ | |
409 | unsigned int sg_timeout; | |
410 | unsigned int sg_reserved_size; | |
1946089a | 411 | int node; |
6c5c9341 | 412 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 413 | struct blk_trace *blk_trace; |
6c5c9341 | 414 | #endif |
1da177e4 LT |
415 | /* |
416 | * reserved for flush operations | |
417 | */ | |
797e7dbb TH |
418 | unsigned int ordered, next_ordered, ordseq; |
419 | int orderr, ordcolor; | |
420 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
421 | struct request *orig_bar_rq; | |
483f4afc AV |
422 | |
423 | struct mutex sysfs_lock; | |
d351af01 FT |
424 | |
425 | #if defined(CONFIG_BLK_DEV_BSG) | |
426 | struct bsg_class_device bsg_dev; | |
427 | #endif | |
4beab5c6 | 428 | struct blk_cmd_filter cmd_filter; |
1da177e4 LT |
429 | }; |
430 | ||
1da177e4 LT |
431 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
432 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
433 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
4e97182a QY |
434 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
435 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
436 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
437 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
438 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 439 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 440 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 441 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 442 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 443 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 444 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
797e7dbb | 445 | |
8f45c1a5 LT |
446 | static inline int queue_is_locked(struct request_queue *q) |
447 | { | |
7663c1e2 | 448 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
449 | spinlock_t *lock = q->queue_lock; |
450 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
451 | #else |
452 | return 1; | |
453 | #endif | |
8f45c1a5 LT |
454 | } |
455 | ||
75ad23bc NP |
456 | static inline void queue_flag_set_unlocked(unsigned int flag, |
457 | struct request_queue *q) | |
458 | { | |
459 | __set_bit(flag, &q->queue_flags); | |
460 | } | |
461 | ||
e48ec690 JA |
462 | static inline int queue_flag_test_and_clear(unsigned int flag, |
463 | struct request_queue *q) | |
464 | { | |
465 | WARN_ON_ONCE(!queue_is_locked(q)); | |
466 | ||
467 | if (test_bit(flag, &q->queue_flags)) { | |
468 | __clear_bit(flag, &q->queue_flags); | |
469 | return 1; | |
470 | } | |
471 | ||
472 | return 0; | |
473 | } | |
474 | ||
475 | static inline int queue_flag_test_and_set(unsigned int flag, | |
476 | struct request_queue *q) | |
477 | { | |
478 | WARN_ON_ONCE(!queue_is_locked(q)); | |
479 | ||
480 | if (!test_bit(flag, &q->queue_flags)) { | |
481 | __set_bit(flag, &q->queue_flags); | |
482 | return 0; | |
483 | } | |
484 | ||
485 | return 1; | |
486 | } | |
487 | ||
75ad23bc NP |
488 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
489 | { | |
8f45c1a5 | 490 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
491 | __set_bit(flag, &q->queue_flags); |
492 | } | |
493 | ||
494 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
495 | struct request_queue *q) | |
496 | { | |
497 | __clear_bit(flag, &q->queue_flags); | |
498 | } | |
499 | ||
500 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
501 | { | |
8f45c1a5 | 502 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
503 | __clear_bit(flag, &q->queue_flags); |
504 | } | |
505 | ||
797e7dbb TH |
506 | enum { |
507 | /* | |
508 | * Hardbarrier is supported with one of the following methods. | |
509 | * | |
510 | * NONE : hardbarrier unsupported | |
511 | * DRAIN : ordering by draining is enough | |
512 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
513 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
514 | * TAG : ordering by tag is enough | |
515 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
516 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
517 | */ | |
518 | QUEUE_ORDERED_NONE = 0x00, | |
519 | QUEUE_ORDERED_DRAIN = 0x01, | |
520 | QUEUE_ORDERED_TAG = 0x02, | |
521 | ||
522 | QUEUE_ORDERED_PREFLUSH = 0x10, | |
523 | QUEUE_ORDERED_POSTFLUSH = 0x20, | |
524 | QUEUE_ORDERED_FUA = 0x40, | |
525 | ||
526 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | | |
527 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
528 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
529 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
530 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | | |
531 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
532 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
533 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
534 | ||
535 | /* | |
536 | * Ordered operation sequence | |
537 | */ | |
538 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
539 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
540 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
541 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
542 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
543 | QUEUE_ORDSEQ_DONE = 0x20, | |
544 | }; | |
1da177e4 LT |
545 | |
546 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
547 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
548 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 549 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
797e7dbb | 550 | #define blk_queue_flushing(q) ((q)->ordseq) |
4ee5eaf4 KU |
551 | #define blk_queue_stackable(q) \ |
552 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
1da177e4 | 553 | |
4aff5e23 JA |
554 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
555 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
556 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
557 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
558 | ||
559 | #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST) | |
560 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) | |
1da177e4 | 561 | |
e17fc0a1 | 562 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
1da177e4 | 563 | |
4aff5e23 JA |
564 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
565 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 566 | #define blk_pm_request(rq) \ |
4aff5e23 | 567 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 568 | |
ab780f1e | 569 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
4aff5e23 JA |
570 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
571 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
572 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
fb2dce86 | 573 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
abae1fde | 574 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
bf2de6f5 | 575 | #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) |
336cdb40 KU |
576 | /* rq->queuelist of dequeued request must be list_empty() */ |
577 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
578 | |
579 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
580 | ||
4aff5e23 | 581 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 582 | |
9e2585a8 JA |
583 | /* |
584 | * We regard a request as sync, if it's a READ or a SYNC write. | |
585 | */ | |
586 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) | |
5404bc7a | 587 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
9e2585a8 | 588 | |
1da177e4 LT |
589 | static inline int blk_queue_full(struct request_queue *q, int rw) |
590 | { | |
591 | if (rw == READ) | |
592 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); | |
593 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); | |
594 | } | |
595 | ||
596 | static inline void blk_set_queue_full(struct request_queue *q, int rw) | |
597 | { | |
598 | if (rw == READ) | |
75ad23bc | 599 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
1da177e4 | 600 | else |
75ad23bc | 601 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
602 | } |
603 | ||
604 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) | |
605 | { | |
606 | if (rw == READ) | |
75ad23bc | 607 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
1da177e4 | 608 | else |
75ad23bc | 609 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
610 | } |
611 | ||
612 | ||
613 | /* | |
614 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
615 | * it already be started by driver. | |
616 | */ | |
617 | #define RQ_NOMERGE_FLAGS \ | |
618 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
619 | #define rq_mergeable(rq) \ | |
e17fc0a1 DW |
620 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
621 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
1da177e4 | 622 | |
1da177e4 LT |
623 | /* |
624 | * q->prep_rq_fn return values | |
625 | */ | |
626 | #define BLKPREP_OK 0 /* serve it */ | |
627 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
628 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
629 | ||
630 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
631 | ||
632 | /* | |
633 | * standard bounce addresses: | |
634 | * | |
635 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
636 | * BLK_BOUNCE_ANY : don't bounce anything | |
637 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
638 | */ | |
2472892a AK |
639 | |
640 | #if BITS_PER_LONG == 32 | |
1da177e4 | 641 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
642 | #else |
643 | #define BLK_BOUNCE_HIGH -1ULL | |
644 | #endif | |
645 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
646 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
647 | ||
3d6392cf JA |
648 | /* |
649 | * default timeout for SG_IO if none specified | |
650 | */ | |
651 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
652 | ||
2a7326b5 | 653 | #ifdef CONFIG_BOUNCE |
1da177e4 | 654 | extern int init_emergency_isa_pool(void); |
165125e1 | 655 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
656 | #else |
657 | static inline int init_emergency_isa_pool(void) | |
658 | { | |
659 | return 0; | |
660 | } | |
165125e1 | 661 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
662 | { |
663 | } | |
664 | #endif /* CONFIG_MMU */ | |
665 | ||
152e283f FT |
666 | struct rq_map_data { |
667 | struct page **pages; | |
668 | int page_order; | |
669 | int nr_entries; | |
670 | }; | |
671 | ||
5705f702 N |
672 | struct req_iterator { |
673 | int i; | |
674 | struct bio *bio; | |
675 | }; | |
676 | ||
677 | /* This should not be used directly - use rq_for_each_segment */ | |
678 | #define __rq_for_each_bio(_bio, rq) \ | |
1da177e4 LT |
679 | if ((rq->bio)) \ |
680 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
681 | ||
5705f702 N |
682 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
683 | __rq_for_each_bio(_iter.bio, _rq) \ | |
684 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
685 | ||
686 | #define rq_iter_last(rq, _iter) \ | |
687 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
688 | ||
1da177e4 LT |
689 | extern int blk_register_queue(struct gendisk *disk); |
690 | extern void blk_unregister_queue(struct gendisk *disk); | |
691 | extern void register_disk(struct gendisk *dev); | |
692 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 693 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 694 | extern void blk_put_request(struct request *); |
165125e1 | 695 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 JA |
696 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
697 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
698 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 KU |
699 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
700 | extern int blk_insert_cloned_request(struct request_queue *q, | |
701 | struct request *rq); | |
165125e1 | 702 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 703 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
704 | extern int blk_remove_plug(struct request_queue *); |
705 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
45e79a3a FT |
706 | extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |
707 | struct gendisk *, unsigned int, void __user *); | |
21b2f0c8 CH |
708 | extern int sg_scsi_ioctl(struct file *, struct request_queue *, |
709 | struct gendisk *, struct scsi_ioctl_command __user *); | |
3fcfab16 | 710 | |
1aa4f24f JA |
711 | /* |
712 | * Temporary export, until SCSI gets fixed up. | |
713 | */ | |
3001ca77 N |
714 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
715 | struct bio *bio); | |
1aa4f24f | 716 | |
3fcfab16 AM |
717 | /* |
718 | * A queue has just exitted congestion. Note this in the global counter of | |
719 | * congested queues, and wake up anyone who was waiting for requests to be | |
720 | * put back. | |
721 | */ | |
165125e1 | 722 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
723 | { |
724 | clear_bdi_congested(&q->backing_dev_info, rw); | |
725 | } | |
726 | ||
727 | /* | |
728 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
729 | * state flags and increment the global gounter of congested queues. | |
730 | */ | |
165125e1 | 731 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
732 | { |
733 | set_bdi_congested(&q->backing_dev_info, rw); | |
734 | } | |
735 | ||
165125e1 JA |
736 | extern void blk_start_queue(struct request_queue *q); |
737 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 738 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 739 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 740 | extern void __blk_run_queue(struct request_queue *); |
165125e1 JA |
741 | extern void blk_run_queue(struct request_queue *); |
742 | extern void blk_start_queueing(struct request_queue *); | |
a3bce90e | 743 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
744 | struct rq_map_data *, void __user *, unsigned long, |
745 | gfp_t); | |
8e5cfc45 | 746 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
747 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
748 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
749 | struct rq_map_data *, struct sg_iovec *, int, |
750 | unsigned int, gfp_t); | |
165125e1 | 751 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 752 | struct request *, int); |
165125e1 | 753 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 754 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 755 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 756 | |
165125e1 | 757 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
758 | { |
759 | return bdev->bd_disk->queue; | |
760 | } | |
761 | ||
762 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
763 | struct page *page) | |
764 | { | |
765 | if (bdi && bdi->unplug_io_fn) | |
766 | bdi->unplug_io_fn(bdi, page); | |
767 | } | |
768 | ||
769 | static inline void blk_run_address_space(struct address_space *mapping) | |
770 | { | |
771 | if (mapping) | |
772 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
773 | } | |
774 | ||
775 | /* | |
3bcddeac KU |
776 | * blk_end_request() and friends. |
777 | * __blk_end_request() and end_request() must be called with | |
778 | * the request queue spinlock acquired. | |
1da177e4 LT |
779 | * |
780 | * Several drivers define their own end_request and call | |
3bcddeac KU |
781 | * blk_end_request() for parts of the original function. |
782 | * This prevents code duplication in drivers. | |
1da177e4 | 783 | */ |
22b13210 JA |
784 | extern int blk_end_request(struct request *rq, int error, |
785 | unsigned int nr_bytes); | |
786 | extern int __blk_end_request(struct request *rq, int error, | |
787 | unsigned int nr_bytes); | |
788 | extern int blk_end_bidi_request(struct request *rq, int error, | |
789 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
a0cd1285 JA |
790 | extern void end_request(struct request *, int); |
791 | extern void end_queued_request(struct request *, int); | |
792 | extern void end_dequeued_request(struct request *, int); | |
22b13210 JA |
793 | extern int blk_end_request_callback(struct request *rq, int error, |
794 | unsigned int nr_bytes, | |
795 | int (drv_callback)(struct request *)); | |
ff856bad | 796 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
797 | extern void __blk_complete_request(struct request *); |
798 | extern void blk_abort_request(struct request *); | |
11914a53 | 799 | extern void blk_abort_queue(struct request_queue *); |
32fab448 KU |
800 | extern void blk_update_request(struct request *rq, int error, |
801 | unsigned int nr_bytes); | |
ff856bad | 802 | |
1da177e4 | 803 | /* |
3b11313a KU |
804 | * blk_end_request() takes bytes instead of sectors as a complete size. |
805 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
806 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
1da177e4 | 807 | */ |
3b11313a KU |
808 | extern unsigned int blk_rq_bytes(struct request *rq); |
809 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
1da177e4 LT |
810 | |
811 | static inline void blkdev_dequeue_request(struct request *req) | |
812 | { | |
8922e16c | 813 | elv_dequeue_request(req->q, req); |
1da177e4 | 814 | } |
1da177e4 | 815 | |
1da177e4 LT |
816 | /* |
817 | * Access functions for manipulating queue properties | |
818 | */ | |
165125e1 | 819 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 820 | spinlock_t *lock, int node_id); |
165125e1 JA |
821 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
822 | extern void blk_cleanup_queue(struct request_queue *); | |
823 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
824 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
825 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
826 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
827 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
828 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
829 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
830 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 831 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 832 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
833 | extern int blk_queue_dma_drain(struct request_queue *q, |
834 | dma_drain_needed_fn *dma_drain_needed, | |
835 | void *buf, unsigned int size); | |
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); | |
838 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
839 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 840 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 841 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
fb2dce86 | 842 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_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); | |
1da177e4 | 845 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 846 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
165125e1 JA |
847 | extern int blk_do_ordered(struct request_queue *, struct request **); |
848 | extern unsigned blk_ordered_cur_seq(struct request_queue *); | |
797e7dbb | 849 | extern unsigned blk_ordered_req_seq(struct request *); |
165125e1 | 850 | extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 851 | |
165125e1 | 852 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 853 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 JA |
854 | extern void generic_unplug_device(struct request_queue *); |
855 | extern void __generic_unplug_device(struct request_queue *); | |
1da177e4 | 856 | extern long nr_blockdev_pages(void); |
1da177e4 | 857 | |
165125e1 JA |
858 | int blk_get_queue(struct request_queue *); |
859 | struct request_queue *blk_alloc_queue(gfp_t); | |
860 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
861 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
862 | |
863 | /* | |
864 | * tag stuff | |
865 | */ | |
4aff5e23 | 866 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
867 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
868 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
869 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
870 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
871 | extern void blk_queue_free_tags(struct request_queue *); | |
872 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
873 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
874 | extern struct blk_queue_tag *blk_init_tags(int); |
875 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 876 | |
f583f492 DS |
877 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
878 | int tag) | |
879 | { | |
880 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
881 | return NULL; | |
882 | return bqt->tag_index[tag]; | |
883 | } | |
884 | ||
1da177e4 | 885 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
3e6053d7 HD |
886 | extern int blkdev_issue_discard(struct block_device *, |
887 | sector_t sector, sector_t nr_sects, gfp_t); | |
fb2dce86 DW |
888 | |
889 | static inline int sb_issue_discard(struct super_block *sb, | |
3e6053d7 | 890 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
891 | { |
892 | block <<= (sb->s_blocksize_bits - 9); | |
893 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
3e6053d7 | 894 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
fb2dce86 | 895 | } |
1da177e4 | 896 | |
0b07de85 AG |
897 | /* |
898 | * command filter functions | |
899 | */ | |
4beab5c6 | 900 | extern int blk_verify_command(struct blk_cmd_filter *filter, |
abf54393 | 901 | unsigned char *cmd, int has_write_perm); |
4beab5c6 | 902 | extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
0b07de85 | 903 | |
1da177e4 LT |
904 | #define MAX_PHYS_SEGMENTS 128 |
905 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
906 | #define SAFE_MAX_SECTORS 255 |
907 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
908 | |
909 | #define MAX_SEGMENT_SIZE 65536 | |
910 | ||
911 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) | |
912 | ||
165125e1 | 913 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
914 | { |
915 | int retval = 512; | |
916 | ||
917 | if (q && q->hardsect_size) | |
918 | retval = q->hardsect_size; | |
919 | ||
920 | return retval; | |
921 | } | |
922 | ||
923 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
924 | { | |
925 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
926 | } | |
927 | ||
165125e1 | 928 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 929 | { |
482eb689 | 930 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
931 | } |
932 | ||
87904074 FT |
933 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
934 | unsigned int len) | |
935 | { | |
936 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
937 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
938 | } | |
939 | ||
1da177e4 LT |
940 | /* assumes size > 256 */ |
941 | static inline unsigned int blksize_bits(unsigned int size) | |
942 | { | |
943 | unsigned int bits = 8; | |
944 | do { | |
945 | bits++; | |
946 | size >>= 1; | |
947 | } while (size > 256); | |
948 | return bits; | |
949 | } | |
950 | ||
2befb9e3 | 951 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
952 | { |
953 | return bdev->bd_block_size; | |
954 | } | |
955 | ||
956 | typedef struct {struct page *v;} Sector; | |
957 | ||
958 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
959 | ||
960 | static inline void put_dev_sector(Sector p) | |
961 | { | |
962 | page_cache_release(p.v); | |
963 | } | |
964 | ||
965 | struct work_struct; | |
18887ad9 | 966 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
19a75d83 | 967 | void kblockd_flush_work(struct work_struct *work); |
1da177e4 | 968 | |
1da177e4 LT |
969 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
970 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
971 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
972 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
973 | ||
7ba1ba12 MP |
974 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
975 | ||
b24498d4 JA |
976 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
977 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
978 | |
979 | struct blk_integrity_exchg { | |
980 | void *prot_buf; | |
981 | void *data_buf; | |
982 | sector_t sector; | |
983 | unsigned int data_size; | |
984 | unsigned short sector_size; | |
985 | const char *disk_name; | |
986 | }; | |
987 | ||
988 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
989 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
990 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
991 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
992 | ||
993 | struct blk_integrity { | |
994 | integrity_gen_fn *generate_fn; | |
995 | integrity_vrfy_fn *verify_fn; | |
996 | integrity_set_tag_fn *set_tag_fn; | |
997 | integrity_get_tag_fn *get_tag_fn; | |
998 | ||
999 | unsigned short flags; | |
1000 | unsigned short tuple_size; | |
1001 | unsigned short sector_size; | |
1002 | unsigned short tag_size; | |
1003 | ||
1004 | const char *name; | |
1005 | ||
1006 | struct kobject kobj; | |
1007 | }; | |
1008 | ||
1009 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1010 | extern void blk_integrity_unregister(struct gendisk *); | |
1011 | extern int blk_integrity_compare(struct block_device *, struct block_device *); | |
1012 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); | |
1013 | extern int blk_rq_count_integrity_sg(struct request *); | |
1014 | ||
7ba1ba12 MP |
1015 | static inline int blk_integrity_rq(struct request *rq) |
1016 | { | |
d442cc44 MP |
1017 | if (rq->bio == NULL) |
1018 | return 0; | |
1019 | ||
7ba1ba12 MP |
1020 | return bio_integrity(rq->bio); |
1021 | } | |
1022 | ||
1023 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1024 | ||
1025 | #define blk_integrity_rq(rq) (0) | |
1026 | #define blk_rq_count_integrity_sg(a) (0) | |
1027 | #define blk_rq_map_integrity_sg(a, b) (0) | |
7ba1ba12 MP |
1028 | #define blk_integrity_compare(a, b) (0) |
1029 | #define blk_integrity_register(a, b) (0) | |
1030 | #define blk_integrity_unregister(a) do { } while (0); | |
1031 | ||
1032 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1033 | ||
9361401e DH |
1034 | #else /* CONFIG_BLOCK */ |
1035 | /* | |
1036 | * stubs for when the block layer is configured out | |
1037 | */ | |
1038 | #define buffer_heads_over_limit 0 | |
1039 | ||
9361401e DH |
1040 | static inline long nr_blockdev_pages(void) |
1041 | { | |
1042 | return 0; | |
1043 | } | |
1044 | ||
9361401e DH |
1045 | #endif /* CONFIG_BLOCK */ |
1046 | ||
1da177e4 | 1047 | #endif |