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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> | |
d351af01 | 19 | #include <linux/bsg.h> |
1da177e4 LT |
20 | |
21 | #include <asm/scatterlist.h> | |
22 | ||
21b2f0c8 CH |
23 | struct scsi_ioctl_command; |
24 | ||
1da177e4 | 25 | struct request_queue; |
1da177e4 LT |
26 | struct elevator_queue; |
27 | typedef struct elevator_queue elevator_t; | |
28 | struct request_pm_state; | |
2056a782 | 29 | struct blk_trace; |
3d6392cf JA |
30 | struct request; |
31 | struct sg_io_hdr; | |
1da177e4 LT |
32 | |
33 | #define BLKDEV_MIN_RQ 4 | |
34 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
35 | ||
1da177e4 | 36 | struct request; |
8ffdc655 | 37 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
38 | |
39 | struct request_list { | |
40 | int count[2]; | |
41 | int starved[2]; | |
cb98fc8b | 42 | int elvpriv; |
1da177e4 LT |
43 | mempool_t *rq_pool; |
44 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
45 | }; |
46 | ||
4aff5e23 JA |
47 | /* |
48 | * request command types | |
49 | */ | |
50 | enum rq_cmd_type_bits { | |
51 | REQ_TYPE_FS = 1, /* fs request */ | |
52 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
53 | REQ_TYPE_SENSE, /* sense request */ | |
54 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
55 | REQ_TYPE_PM_RESUME, /* resume request */ | |
56 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
57 | REQ_TYPE_FLUSH, /* flush request */ | |
58 | REQ_TYPE_SPECIAL, /* driver defined type */ | |
59 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
60 | /* | |
61 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
62 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
63 | * private REQ_LB opcodes to differentiate what type of request this is | |
64 | */ | |
4aff5e23 | 65 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 66 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
67 | }; |
68 | ||
69 | /* | |
70 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
71 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
72 | * SCSI cdb. | |
73 | * | |
74 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
75 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
76 | * | |
77 | */ | |
78 | enum { | |
79 | /* | |
80 | * just examples for now | |
81 | */ | |
82 | REQ_LB_OP_EJECT = 0x40, /* eject request */ | |
83 | REQ_LB_OP_FLUSH = 0x41, /* flush device */ | |
eae9acd1 | 84 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
4aff5e23 JA |
85 | }; |
86 | ||
87 | /* | |
d628eaef | 88 | * request type modified bits. first two bits match BIO_RW* bits, important |
4aff5e23 JA |
89 | */ |
90 | enum rq_flag_bits { | |
91 | __REQ_RW, /* not set, read. set, write */ | |
92 | __REQ_FAILFAST, /* no low level driver retries */ | |
fb2dce86 | 93 | __REQ_DISCARD, /* request to discard sectors */ |
4aff5e23 JA |
94 | __REQ_SORTED, /* elevator knows about this request */ |
95 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
96 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
97 | __REQ_FUA, /* forced unit access */ | |
98 | __REQ_NOMERGE, /* don't touch this for merging */ | |
99 | __REQ_STARTED, /* drive already may have started this one */ | |
100 | __REQ_DONTPREP, /* don't call prep for this one */ | |
101 | __REQ_QUEUED, /* uses queueing */ | |
102 | __REQ_ELVPRIV, /* elevator private data attached */ | |
103 | __REQ_FAILED, /* set if the request failed */ | |
104 | __REQ_QUIET, /* don't worry about errors */ | |
105 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
106 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
107 | __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ | |
49171e5c | 108 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 109 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 110 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 111 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
4aff5e23 JA |
112 | __REQ_NR_BITS, /* stops here */ |
113 | }; | |
114 | ||
115 | #define REQ_RW (1 << __REQ_RW) | |
fb2dce86 | 116 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
4aff5e23 JA |
117 | #define REQ_FAILFAST (1 << __REQ_FAILFAST) |
118 | #define REQ_SORTED (1 << __REQ_SORTED) | |
119 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
120 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
121 | #define REQ_FUA (1 << __REQ_FUA) | |
122 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
123 | #define REQ_STARTED (1 << __REQ_STARTED) | |
124 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
125 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
126 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
127 | #define REQ_FAILED (1 << __REQ_FAILED) | |
128 | #define REQ_QUIET (1 << __REQ_QUIET) | |
129 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
130 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
131 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 132 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 133 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 134 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 135 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
4aff5e23 | 136 | |
1da177e4 LT |
137 | #define BLK_MAX_CDB 16 |
138 | ||
139 | /* | |
63a71386 JA |
140 | * try to put the fields that are referenced together in the same cacheline. |
141 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
142 | * as well! | |
1da177e4 LT |
143 | */ |
144 | struct request { | |
ff856bad JA |
145 | struct list_head queuelist; |
146 | struct list_head donelist; | |
147 | ||
165125e1 | 148 | struct request_queue *q; |
e6a1c874 | 149 | |
4aff5e23 JA |
150 | unsigned int cmd_flags; |
151 | enum rq_cmd_type_bits cmd_type; | |
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 | ||
196 | /* Number of scatter-gather addr+len pairs after | |
197 | * physical and DMA remapping hardware coalescing is performed. | |
198 | * This is the number of scatter-gather entries the driver | |
199 | * will actually have to deal with after DMA mapping is done. | |
200 | */ | |
201 | unsigned short nr_hw_segments; | |
202 | ||
8f34ee75 JA |
203 | unsigned short ioprio; |
204 | ||
1da177e4 | 205 | void *special; |
8f34ee75 | 206 | char *buffer; |
1da177e4 | 207 | |
cdd60262 JA |
208 | int tag; |
209 | int errors; | |
210 | ||
211 | int ref_count; | |
212 | ||
1da177e4 LT |
213 | /* |
214 | * when request is used as a packet command carrier | |
215 | */ | |
d7e3c324 FT |
216 | unsigned short cmd_len; |
217 | unsigned char __cmd[BLK_MAX_CDB]; | |
218 | unsigned char *cmd; | |
1da177e4 LT |
219 | |
220 | unsigned int data_len; | |
7a85f889 | 221 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 222 | unsigned int sense_len; |
8f34ee75 | 223 | void *data; |
1da177e4 LT |
224 | void *sense; |
225 | ||
226 | unsigned int timeout; | |
17e01f21 | 227 | int retries; |
1da177e4 | 228 | |
1da177e4 | 229 | /* |
c00895ab | 230 | * completion callback. |
1da177e4 LT |
231 | */ |
232 | rq_end_io_fn *end_io; | |
233 | void *end_io_data; | |
abae1fde FT |
234 | |
235 | /* for bidi */ | |
236 | struct request *next_rq; | |
1da177e4 LT |
237 | }; |
238 | ||
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 LT |
272 | |
273 | enum blk_queue_state { | |
274 | Queue_down, | |
275 | Queue_up, | |
276 | }; | |
277 | ||
1da177e4 LT |
278 | struct blk_queue_tag { |
279 | struct request **tag_index; /* map of busy tags */ | |
280 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
281 | int busy; /* current depth */ |
282 | int max_depth; /* what we will send to device */ | |
ba025082 | 283 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
284 | atomic_t refcnt; /* map can be shared */ |
285 | }; | |
286 | ||
abf54393 FT |
287 | #define BLK_SCSI_MAX_CMDS (256) |
288 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
289 | ||
4beab5c6 | 290 | struct blk_cmd_filter { |
abf54393 FT |
291 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
292 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
293 | struct kobject kobj; | |
294 | }; | |
295 | ||
1da177e4 LT |
296 | struct request_queue |
297 | { | |
298 | /* | |
299 | * Together with queue_head for cacheline sharing | |
300 | */ | |
301 | struct list_head queue_head; | |
302 | struct request *last_merge; | |
303 | elevator_t *elevator; | |
304 | ||
305 | /* | |
306 | * the queue request freelist, one for reads and one for writes | |
307 | */ | |
308 | struct request_list rq; | |
309 | ||
310 | request_fn_proc *request_fn; | |
1da177e4 LT |
311 | make_request_fn *make_request_fn; |
312 | prep_rq_fn *prep_rq_fn; | |
313 | unplug_fn *unplug_fn; | |
fb2dce86 | 314 | prepare_discard_fn *prepare_discard_fn; |
1da177e4 | 315 | merge_bvec_fn *merge_bvec_fn; |
1da177e4 | 316 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 317 | softirq_done_fn *softirq_done_fn; |
2fb98e84 | 318 | dma_drain_needed_fn *dma_drain_needed; |
1da177e4 | 319 | |
8922e16c TH |
320 | /* |
321 | * Dispatch queue sorting | |
322 | */ | |
1b47f531 | 323 | sector_t end_sector; |
8922e16c | 324 | struct request *boundary_rq; |
8922e16c | 325 | |
1da177e4 LT |
326 | /* |
327 | * Auto-unplugging state | |
328 | */ | |
329 | struct timer_list unplug_timer; | |
330 | int unplug_thresh; /* After this many requests */ | |
331 | unsigned long unplug_delay; /* After this many jiffies */ | |
332 | struct work_struct unplug_work; | |
333 | ||
334 | struct backing_dev_info backing_dev_info; | |
335 | ||
336 | /* | |
337 | * The queue owner gets to use this for whatever they like. | |
338 | * ll_rw_blk doesn't touch it. | |
339 | */ | |
340 | void *queuedata; | |
341 | ||
1da177e4 LT |
342 | /* |
343 | * queue needs bounce pages for pages above this limit | |
344 | */ | |
345 | unsigned long bounce_pfn; | |
8267e268 | 346 | gfp_t bounce_gfp; |
1da177e4 LT |
347 | |
348 | /* | |
349 | * various queue flags, see QUEUE_* below | |
350 | */ | |
351 | unsigned long queue_flags; | |
352 | ||
353 | /* | |
152587de | 354 | * protects queue structures from reentrancy. ->__queue_lock should |
355 | * _never_ be used directly, it is queue private. always use | |
356 | * ->queue_lock. | |
1da177e4 | 357 | */ |
152587de | 358 | spinlock_t __queue_lock; |
1da177e4 LT |
359 | spinlock_t *queue_lock; |
360 | ||
361 | /* | |
362 | * queue kobject | |
363 | */ | |
364 | struct kobject kobj; | |
365 | ||
366 | /* | |
367 | * queue settings | |
368 | */ | |
369 | unsigned long nr_requests; /* Max # of requests */ | |
370 | unsigned int nr_congestion_on; | |
371 | unsigned int nr_congestion_off; | |
372 | unsigned int nr_batching; | |
373 | ||
2cb2e147 JA |
374 | unsigned int max_sectors; |
375 | unsigned int max_hw_sectors; | |
1da177e4 LT |
376 | unsigned short max_phys_segments; |
377 | unsigned short max_hw_segments; | |
378 | unsigned short hardsect_size; | |
379 | unsigned int max_segment_size; | |
380 | ||
381 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
382 | void *dma_drain_buffer; |
383 | unsigned int dma_drain_size; | |
e3790c7d | 384 | unsigned int dma_pad_mask; |
1da177e4 LT |
385 | unsigned int dma_alignment; |
386 | ||
387 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 388 | struct list_head tag_busy_list; |
1da177e4 | 389 | |
15853af9 | 390 | unsigned int nr_sorted; |
1da177e4 LT |
391 | unsigned int in_flight; |
392 | ||
393 | /* | |
394 | * sg stuff | |
395 | */ | |
396 | unsigned int sg_timeout; | |
397 | unsigned int sg_reserved_size; | |
1946089a | 398 | int node; |
6c5c9341 | 399 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 400 | struct blk_trace *blk_trace; |
6c5c9341 | 401 | #endif |
1da177e4 LT |
402 | /* |
403 | * reserved for flush operations | |
404 | */ | |
797e7dbb TH |
405 | unsigned int ordered, next_ordered, ordseq; |
406 | int orderr, ordcolor; | |
407 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
408 | struct request *orig_bar_rq; | |
483f4afc AV |
409 | |
410 | struct mutex sysfs_lock; | |
d351af01 FT |
411 | |
412 | #if defined(CONFIG_BLK_DEV_BSG) | |
413 | struct bsg_class_device bsg_dev; | |
414 | #endif | |
4beab5c6 | 415 | struct blk_cmd_filter cmd_filter; |
1da177e4 LT |
416 | }; |
417 | ||
1da177e4 LT |
418 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
419 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
420 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
4e97182a QY |
421 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
422 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
423 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
424 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
425 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 426 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 427 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 428 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
797e7dbb | 429 | |
8f45c1a5 LT |
430 | static inline int queue_is_locked(struct request_queue *q) |
431 | { | |
7663c1e2 | 432 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
433 | spinlock_t *lock = q->queue_lock; |
434 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
435 | #else |
436 | return 1; | |
437 | #endif | |
8f45c1a5 LT |
438 | } |
439 | ||
75ad23bc NP |
440 | static inline void queue_flag_set_unlocked(unsigned int flag, |
441 | struct request_queue *q) | |
442 | { | |
443 | __set_bit(flag, &q->queue_flags); | |
444 | } | |
445 | ||
e48ec690 JA |
446 | static inline int queue_flag_test_and_clear(unsigned int flag, |
447 | struct request_queue *q) | |
448 | { | |
449 | WARN_ON_ONCE(!queue_is_locked(q)); | |
450 | ||
451 | if (test_bit(flag, &q->queue_flags)) { | |
452 | __clear_bit(flag, &q->queue_flags); | |
453 | return 1; | |
454 | } | |
455 | ||
456 | return 0; | |
457 | } | |
458 | ||
459 | static inline int queue_flag_test_and_set(unsigned int flag, | |
460 | struct request_queue *q) | |
461 | { | |
462 | WARN_ON_ONCE(!queue_is_locked(q)); | |
463 | ||
464 | if (!test_bit(flag, &q->queue_flags)) { | |
465 | __set_bit(flag, &q->queue_flags); | |
466 | return 0; | |
467 | } | |
468 | ||
469 | return 1; | |
470 | } | |
471 | ||
75ad23bc NP |
472 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
473 | { | |
8f45c1a5 | 474 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
475 | __set_bit(flag, &q->queue_flags); |
476 | } | |
477 | ||
478 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
479 | struct request_queue *q) | |
480 | { | |
481 | __clear_bit(flag, &q->queue_flags); | |
482 | } | |
483 | ||
484 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
485 | { | |
8f45c1a5 | 486 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
487 | __clear_bit(flag, &q->queue_flags); |
488 | } | |
489 | ||
797e7dbb TH |
490 | enum { |
491 | /* | |
492 | * Hardbarrier is supported with one of the following methods. | |
493 | * | |
494 | * NONE : hardbarrier unsupported | |
495 | * DRAIN : ordering by draining is enough | |
496 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
497 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
498 | * TAG : ordering by tag is enough | |
499 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
500 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
501 | */ | |
502 | QUEUE_ORDERED_NONE = 0x00, | |
503 | QUEUE_ORDERED_DRAIN = 0x01, | |
504 | QUEUE_ORDERED_TAG = 0x02, | |
505 | ||
506 | QUEUE_ORDERED_PREFLUSH = 0x10, | |
507 | QUEUE_ORDERED_POSTFLUSH = 0x20, | |
508 | QUEUE_ORDERED_FUA = 0x40, | |
509 | ||
510 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | | |
511 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
512 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
513 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
514 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | | |
515 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
516 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
517 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
518 | ||
519 | /* | |
520 | * Ordered operation sequence | |
521 | */ | |
522 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
523 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
524 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
525 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
526 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
527 | QUEUE_ORDSEQ_DONE = 0x20, | |
528 | }; | |
1da177e4 LT |
529 | |
530 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
531 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
532 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 533 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
797e7dbb | 534 | #define blk_queue_flushing(q) ((q)->ordseq) |
1da177e4 | 535 | |
4aff5e23 JA |
536 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
537 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
538 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
539 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
540 | ||
541 | #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST) | |
542 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) | |
1da177e4 | 543 | |
e17fc0a1 | 544 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
1da177e4 | 545 | |
4aff5e23 JA |
546 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
547 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 548 | #define blk_pm_request(rq) \ |
4aff5e23 | 549 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 550 | |
4aff5e23 JA |
551 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
552 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
553 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
fb2dce86 | 554 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
abae1fde | 555 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
bf2de6f5 | 556 | #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) |
336cdb40 KU |
557 | /* rq->queuelist of dequeued request must be list_empty() */ |
558 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
559 | |
560 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
561 | ||
4aff5e23 | 562 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 563 | |
9e2585a8 JA |
564 | /* |
565 | * We regard a request as sync, if it's a READ or a SYNC write. | |
566 | */ | |
567 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) | |
5404bc7a | 568 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
9e2585a8 | 569 | |
1da177e4 LT |
570 | static inline int blk_queue_full(struct request_queue *q, int rw) |
571 | { | |
572 | if (rw == READ) | |
573 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); | |
574 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); | |
575 | } | |
576 | ||
577 | static inline void blk_set_queue_full(struct request_queue *q, int rw) | |
578 | { | |
579 | if (rw == READ) | |
75ad23bc | 580 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
1da177e4 | 581 | else |
75ad23bc | 582 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
583 | } |
584 | ||
585 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) | |
586 | { | |
587 | if (rw == READ) | |
75ad23bc | 588 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
1da177e4 | 589 | else |
75ad23bc | 590 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
591 | } |
592 | ||
593 | ||
594 | /* | |
595 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
596 | * it already be started by driver. | |
597 | */ | |
598 | #define RQ_NOMERGE_FLAGS \ | |
599 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
600 | #define rq_mergeable(rq) \ | |
e17fc0a1 DW |
601 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
602 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
1da177e4 | 603 | |
1da177e4 LT |
604 | /* |
605 | * q->prep_rq_fn return values | |
606 | */ | |
607 | #define BLKPREP_OK 0 /* serve it */ | |
608 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
609 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
610 | ||
611 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
612 | ||
613 | /* | |
614 | * standard bounce addresses: | |
615 | * | |
616 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
617 | * BLK_BOUNCE_ANY : don't bounce anything | |
618 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
619 | */ | |
2472892a AK |
620 | |
621 | #if BITS_PER_LONG == 32 | |
1da177e4 | 622 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
623 | #else |
624 | #define BLK_BOUNCE_HIGH -1ULL | |
625 | #endif | |
626 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
627 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
628 | ||
3d6392cf JA |
629 | /* |
630 | * default timeout for SG_IO if none specified | |
631 | */ | |
632 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
633 | ||
2a7326b5 | 634 | #ifdef CONFIG_BOUNCE |
1da177e4 | 635 | extern int init_emergency_isa_pool(void); |
165125e1 | 636 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
637 | #else |
638 | static inline int init_emergency_isa_pool(void) | |
639 | { | |
640 | return 0; | |
641 | } | |
165125e1 | 642 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
643 | { |
644 | } | |
645 | #endif /* CONFIG_MMU */ | |
646 | ||
5705f702 N |
647 | struct req_iterator { |
648 | int i; | |
649 | struct bio *bio; | |
650 | }; | |
651 | ||
652 | /* This should not be used directly - use rq_for_each_segment */ | |
653 | #define __rq_for_each_bio(_bio, rq) \ | |
1da177e4 LT |
654 | if ((rq->bio)) \ |
655 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
656 | ||
5705f702 N |
657 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
658 | __rq_for_each_bio(_iter.bio, _rq) \ | |
659 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
660 | ||
661 | #define rq_iter_last(rq, _iter) \ | |
662 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
663 | ||
1da177e4 LT |
664 | extern int blk_register_queue(struct gendisk *disk); |
665 | extern void blk_unregister_queue(struct gendisk *disk); | |
666 | extern void register_disk(struct gendisk *dev); | |
667 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 668 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 669 | extern void blk_put_request(struct request *); |
165125e1 | 670 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 JA |
671 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
672 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
673 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
674 | extern void blk_plug_device(struct request_queue *); | |
6c5e0c4d | 675 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
676 | extern int blk_remove_plug(struct request_queue *); |
677 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
45e79a3a FT |
678 | extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |
679 | struct gendisk *, unsigned int, void __user *); | |
21b2f0c8 CH |
680 | extern int sg_scsi_ioctl(struct file *, struct request_queue *, |
681 | struct gendisk *, struct scsi_ioctl_command __user *); | |
3fcfab16 | 682 | |
1aa4f24f JA |
683 | /* |
684 | * Temporary export, until SCSI gets fixed up. | |
685 | */ | |
3001ca77 N |
686 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
687 | struct bio *bio); | |
1aa4f24f | 688 | |
3fcfab16 AM |
689 | /* |
690 | * A queue has just exitted congestion. Note this in the global counter of | |
691 | * congested queues, and wake up anyone who was waiting for requests to be | |
692 | * put back. | |
693 | */ | |
165125e1 | 694 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
695 | { |
696 | clear_bdi_congested(&q->backing_dev_info, rw); | |
697 | } | |
698 | ||
699 | /* | |
700 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
701 | * state flags and increment the global gounter of congested queues. | |
702 | */ | |
165125e1 | 703 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
704 | { |
705 | set_bdi_congested(&q->backing_dev_info, rw); | |
706 | } | |
707 | ||
165125e1 JA |
708 | extern void blk_start_queue(struct request_queue *q); |
709 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 710 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 711 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 712 | extern void __blk_run_queue(struct request_queue *); |
165125e1 JA |
713 | extern void blk_run_queue(struct request_queue *); |
714 | extern void blk_start_queueing(struct request_queue *); | |
715 | extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long); | |
8e5cfc45 | 716 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
717 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
718 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
0e75f906 | 719 | struct sg_iovec *, int, unsigned int); |
165125e1 | 720 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 721 | struct request *, int); |
165125e1 | 722 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 723 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 724 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 725 | |
165125e1 | 726 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
727 | { |
728 | return bdev->bd_disk->queue; | |
729 | } | |
730 | ||
731 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
732 | struct page *page) | |
733 | { | |
734 | if (bdi && bdi->unplug_io_fn) | |
735 | bdi->unplug_io_fn(bdi, page); | |
736 | } | |
737 | ||
738 | static inline void blk_run_address_space(struct address_space *mapping) | |
739 | { | |
740 | if (mapping) | |
741 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
742 | } | |
743 | ||
744 | /* | |
3bcddeac KU |
745 | * blk_end_request() and friends. |
746 | * __blk_end_request() and end_request() must be called with | |
747 | * the request queue spinlock acquired. | |
1da177e4 LT |
748 | * |
749 | * Several drivers define their own end_request and call | |
3bcddeac KU |
750 | * blk_end_request() for parts of the original function. |
751 | * This prevents code duplication in drivers. | |
1da177e4 | 752 | */ |
22b13210 JA |
753 | extern int blk_end_request(struct request *rq, int error, |
754 | unsigned int nr_bytes); | |
755 | extern int __blk_end_request(struct request *rq, int error, | |
756 | unsigned int nr_bytes); | |
757 | extern int blk_end_bidi_request(struct request *rq, int error, | |
758 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
a0cd1285 JA |
759 | extern void end_request(struct request *, int); |
760 | extern void end_queued_request(struct request *, int); | |
761 | extern void end_dequeued_request(struct request *, int); | |
22b13210 JA |
762 | extern int blk_end_request_callback(struct request *rq, int error, |
763 | unsigned int nr_bytes, | |
764 | int (drv_callback)(struct request *)); | |
ff856bad JA |
765 | extern void blk_complete_request(struct request *); |
766 | ||
1da177e4 | 767 | /* |
3b11313a KU |
768 | * blk_end_request() takes bytes instead of sectors as a complete size. |
769 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
770 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
1da177e4 | 771 | */ |
3b11313a KU |
772 | extern unsigned int blk_rq_bytes(struct request *rq); |
773 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
1da177e4 LT |
774 | |
775 | static inline void blkdev_dequeue_request(struct request *req) | |
776 | { | |
8922e16c | 777 | elv_dequeue_request(req->q, req); |
1da177e4 | 778 | } |
1da177e4 | 779 | |
1da177e4 LT |
780 | /* |
781 | * Access functions for manipulating queue properties | |
782 | */ | |
165125e1 | 783 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 784 | spinlock_t *lock, int node_id); |
165125e1 JA |
785 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
786 | extern void blk_cleanup_queue(struct request_queue *); | |
787 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
788 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
789 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
790 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
791 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
792 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
793 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
794 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 795 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 796 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
797 | extern int blk_queue_dma_drain(struct request_queue *q, |
798 | dma_drain_needed_fn *dma_drain_needed, | |
799 | void *buf, unsigned int size); | |
165125e1 JA |
800 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
801 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
802 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
803 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 804 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 805 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
fb2dce86 | 806 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
1da177e4 | 807 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 808 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
165125e1 JA |
809 | extern int blk_do_ordered(struct request_queue *, struct request **); |
810 | extern unsigned blk_ordered_cur_seq(struct request_queue *); | |
797e7dbb | 811 | extern unsigned blk_ordered_req_seq(struct request *); |
165125e1 | 812 | extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 813 | |
165125e1 | 814 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 815 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 JA |
816 | extern void generic_unplug_device(struct request_queue *); |
817 | extern void __generic_unplug_device(struct request_queue *); | |
1da177e4 | 818 | extern long nr_blockdev_pages(void); |
1da177e4 | 819 | |
165125e1 JA |
820 | int blk_get_queue(struct request_queue *); |
821 | struct request_queue *blk_alloc_queue(gfp_t); | |
822 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
823 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
824 | |
825 | /* | |
826 | * tag stuff | |
827 | */ | |
4aff5e23 | 828 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
829 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
830 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
831 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
832 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
833 | extern void blk_queue_free_tags(struct request_queue *); | |
834 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
835 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
836 | extern struct blk_queue_tag *blk_init_tags(int); |
837 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 838 | |
f583f492 DS |
839 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
840 | int tag) | |
841 | { | |
842 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
843 | return NULL; | |
844 | return bqt->tag_index[tag]; | |
845 | } | |
846 | ||
1da177e4 | 847 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
fb2dce86 DW |
848 | extern int blkdev_issue_discard(struct block_device *, sector_t sector, |
849 | unsigned nr_sects); | |
850 | ||
851 | static inline int sb_issue_discard(struct super_block *sb, | |
852 | sector_t block, unsigned nr_blocks) | |
853 | { | |
854 | block <<= (sb->s_blocksize_bits - 9); | |
855 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
856 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks); | |
857 | } | |
1da177e4 | 858 | |
0b07de85 AG |
859 | /* |
860 | * command filter functions | |
861 | */ | |
4beab5c6 | 862 | extern int blk_verify_command(struct blk_cmd_filter *filter, |
abf54393 | 863 | unsigned char *cmd, int has_write_perm); |
4beab5c6 | 864 | extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
0b07de85 | 865 | |
1da177e4 LT |
866 | #define MAX_PHYS_SEGMENTS 128 |
867 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
868 | #define SAFE_MAX_SECTORS 255 |
869 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
870 | |
871 | #define MAX_SEGMENT_SIZE 65536 | |
872 | ||
873 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) | |
874 | ||
165125e1 | 875 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
876 | { |
877 | int retval = 512; | |
878 | ||
879 | if (q && q->hardsect_size) | |
880 | retval = q->hardsect_size; | |
881 | ||
882 | return retval; | |
883 | } | |
884 | ||
885 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
886 | { | |
887 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
888 | } | |
889 | ||
165125e1 | 890 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 891 | { |
482eb689 | 892 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
893 | } |
894 | ||
1da177e4 LT |
895 | /* assumes size > 256 */ |
896 | static inline unsigned int blksize_bits(unsigned int size) | |
897 | { | |
898 | unsigned int bits = 8; | |
899 | do { | |
900 | bits++; | |
901 | size >>= 1; | |
902 | } while (size > 256); | |
903 | return bits; | |
904 | } | |
905 | ||
2befb9e3 | 906 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
907 | { |
908 | return bdev->bd_block_size; | |
909 | } | |
910 | ||
911 | typedef struct {struct page *v;} Sector; | |
912 | ||
913 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
914 | ||
915 | static inline void put_dev_sector(Sector p) | |
916 | { | |
917 | page_cache_release(p.v); | |
918 | } | |
919 | ||
920 | struct work_struct; | |
921 | int kblockd_schedule_work(struct work_struct *work); | |
19a75d83 | 922 | void kblockd_flush_work(struct work_struct *work); |
1da177e4 | 923 | |
1da177e4 LT |
924 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
925 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
926 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
927 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
928 | ||
7ba1ba12 MP |
929 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
930 | ||
b24498d4 JA |
931 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
932 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
933 | |
934 | struct blk_integrity_exchg { | |
935 | void *prot_buf; | |
936 | void *data_buf; | |
937 | sector_t sector; | |
938 | unsigned int data_size; | |
939 | unsigned short sector_size; | |
940 | const char *disk_name; | |
941 | }; | |
942 | ||
943 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
944 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
945 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
946 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
947 | ||
948 | struct blk_integrity { | |
949 | integrity_gen_fn *generate_fn; | |
950 | integrity_vrfy_fn *verify_fn; | |
951 | integrity_set_tag_fn *set_tag_fn; | |
952 | integrity_get_tag_fn *get_tag_fn; | |
953 | ||
954 | unsigned short flags; | |
955 | unsigned short tuple_size; | |
956 | unsigned short sector_size; | |
957 | unsigned short tag_size; | |
958 | ||
959 | const char *name; | |
960 | ||
961 | struct kobject kobj; | |
962 | }; | |
963 | ||
964 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
965 | extern void blk_integrity_unregister(struct gendisk *); | |
966 | extern int blk_integrity_compare(struct block_device *, struct block_device *); | |
967 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); | |
968 | extern int blk_rq_count_integrity_sg(struct request *); | |
969 | ||
970 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) | |
971 | { | |
972 | if (bi) | |
973 | return bi->tuple_size; | |
974 | ||
975 | return 0; | |
976 | } | |
977 | ||
978 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
979 | { | |
980 | return bdev->bd_disk->integrity; | |
981 | } | |
982 | ||
983 | static inline unsigned int bdev_get_tag_size(struct block_device *bdev) | |
984 | { | |
985 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
986 | ||
987 | if (bi) | |
988 | return bi->tag_size; | |
989 | ||
990 | return 0; | |
991 | } | |
992 | ||
993 | static inline int bdev_integrity_enabled(struct block_device *bdev, int rw) | |
994 | { | |
995 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
996 | ||
997 | if (bi == NULL) | |
998 | return 0; | |
999 | ||
1000 | if (rw == READ && bi->verify_fn != NULL && | |
b24498d4 | 1001 | (bi->flags & INTEGRITY_FLAG_READ)) |
7ba1ba12 MP |
1002 | return 1; |
1003 | ||
1004 | if (rw == WRITE && bi->generate_fn != NULL && | |
b24498d4 | 1005 | (bi->flags & INTEGRITY_FLAG_WRITE)) |
7ba1ba12 MP |
1006 | return 1; |
1007 | ||
1008 | return 0; | |
1009 | } | |
1010 | ||
1011 | static inline int blk_integrity_rq(struct request *rq) | |
1012 | { | |
d442cc44 MP |
1013 | if (rq->bio == NULL) |
1014 | return 0; | |
1015 | ||
7ba1ba12 MP |
1016 | return bio_integrity(rq->bio); |
1017 | } | |
1018 | ||
1019 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1020 | ||
1021 | #define blk_integrity_rq(rq) (0) | |
1022 | #define blk_rq_count_integrity_sg(a) (0) | |
1023 | #define blk_rq_map_integrity_sg(a, b) (0) | |
1024 | #define bdev_get_integrity(a) (0) | |
1025 | #define bdev_get_tag_size(a) (0) | |
1026 | #define blk_integrity_compare(a, b) (0) | |
1027 | #define blk_integrity_register(a, b) (0) | |
1028 | #define blk_integrity_unregister(a) do { } while (0); | |
1029 | ||
1030 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1031 | ||
9361401e DH |
1032 | #else /* CONFIG_BLOCK */ |
1033 | /* | |
1034 | * stubs for when the block layer is configured out | |
1035 | */ | |
1036 | #define buffer_heads_over_limit 0 | |
1037 | ||
9361401e DH |
1038 | static inline long nr_blockdev_pages(void) |
1039 | { | |
1040 | return 0; | |
1041 | } | |
1042 | ||
9361401e DH |
1043 | #endif /* CONFIG_BLOCK */ |
1044 | ||
1da177e4 | 1045 | #endif |