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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 */ | |
84 | }; | |
85 | ||
86 | /* | |
87 | * request type modified bits. first three bits match BIO_RW* bits, important | |
88 | */ | |
89 | enum rq_flag_bits { | |
90 | __REQ_RW, /* not set, read. set, write */ | |
91 | __REQ_FAILFAST, /* no low level driver retries */ | |
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) | |
114 | #define REQ_FAILFAST (1 << __REQ_FAILFAST) | |
115 | #define REQ_SORTED (1 << __REQ_SORTED) | |
116 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
117 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
118 | #define REQ_FUA (1 << __REQ_FUA) | |
119 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
120 | #define REQ_STARTED (1 << __REQ_STARTED) | |
121 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
122 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
123 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
124 | #define REQ_FAILED (1 << __REQ_FAILED) | |
125 | #define REQ_QUIET (1 << __REQ_QUIET) | |
126 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
127 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
128 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 129 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 130 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 131 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 132 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
4aff5e23 | 133 | |
1da177e4 LT |
134 | #define BLK_MAX_CDB 16 |
135 | ||
136 | /* | |
63a71386 JA |
137 | * try to put the fields that are referenced together in the same cacheline. |
138 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
139 | * as well! | |
1da177e4 LT |
140 | */ |
141 | struct request { | |
ff856bad JA |
142 | struct list_head queuelist; |
143 | struct list_head donelist; | |
144 | ||
165125e1 | 145 | struct request_queue *q; |
e6a1c874 | 146 | |
4aff5e23 JA |
147 | unsigned int cmd_flags; |
148 | enum rq_cmd_type_bits cmd_type; | |
1da177e4 LT |
149 | |
150 | /* Maintain bio traversal state for part by part I/O submission. | |
151 | * hard_* are block layer internals, no driver should touch them! | |
152 | */ | |
153 | ||
154 | sector_t sector; /* next sector to submit */ | |
e6a1c874 | 155 | sector_t hard_sector; /* next sector to complete */ |
1da177e4 | 156 | unsigned long nr_sectors; /* no. of sectors left to submit */ |
e6a1c874 | 157 | unsigned long hard_nr_sectors; /* no. of sectors left to complete */ |
1da177e4 LT |
158 | /* no. of sectors left to submit in the current segment */ |
159 | unsigned int current_nr_sectors; | |
160 | ||
1da177e4 LT |
161 | /* no. of sectors left to complete in the current segment */ |
162 | unsigned int hard_cur_sectors; | |
163 | ||
164 | struct bio *bio; | |
165 | struct bio *biotail; | |
166 | ||
9817064b | 167 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
168 | /* |
169 | * The rb_node is only used inside the io scheduler, requests | |
170 | * are pruned when moved to the dispatch queue. So let the | |
171 | * completion_data share space with the rb_node. | |
172 | */ | |
173 | union { | |
174 | struct rb_node rb_node; /* sort/lookup */ | |
175 | void *completion_data; | |
176 | }; | |
9817064b | 177 | |
ff7d145f JA |
178 | /* |
179 | * two pointers are available for the IO schedulers, if they need | |
180 | * more they have to dynamically allocate it. | |
181 | */ | |
1da177e4 | 182 | void *elevator_private; |
ff7d145f JA |
183 | void *elevator_private2; |
184 | ||
8f34ee75 | 185 | struct gendisk *rq_disk; |
1da177e4 LT |
186 | unsigned long start_time; |
187 | ||
188 | /* Number of scatter-gather DMA addr+len pairs after | |
189 | * physical address coalescing is performed. | |
190 | */ | |
191 | unsigned short nr_phys_segments; | |
192 | ||
193 | /* Number of scatter-gather addr+len pairs after | |
194 | * physical and DMA remapping hardware coalescing is performed. | |
195 | * This is the number of scatter-gather entries the driver | |
196 | * will actually have to deal with after DMA mapping is done. | |
197 | */ | |
198 | unsigned short nr_hw_segments; | |
199 | ||
8f34ee75 JA |
200 | unsigned short ioprio; |
201 | ||
1da177e4 | 202 | void *special; |
8f34ee75 | 203 | char *buffer; |
1da177e4 | 204 | |
cdd60262 JA |
205 | int tag; |
206 | int errors; | |
207 | ||
208 | int ref_count; | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * when request is used as a packet command carrier | |
212 | */ | |
d7e3c324 FT |
213 | unsigned short cmd_len; |
214 | unsigned char __cmd[BLK_MAX_CDB]; | |
215 | unsigned char *cmd; | |
1da177e4 LT |
216 | |
217 | unsigned int data_len; | |
7a85f889 | 218 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 219 | unsigned int sense_len; |
8f34ee75 | 220 | void *data; |
1da177e4 LT |
221 | void *sense; |
222 | ||
223 | unsigned int timeout; | |
17e01f21 | 224 | int retries; |
1da177e4 | 225 | |
1da177e4 | 226 | /* |
c00895ab | 227 | * completion callback. |
1da177e4 LT |
228 | */ |
229 | rq_end_io_fn *end_io; | |
230 | void *end_io_data; | |
abae1fde FT |
231 | |
232 | /* for bidi */ | |
233 | struct request *next_rq; | |
1da177e4 LT |
234 | }; |
235 | ||
236 | /* | |
4aff5e23 | 237 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
238 | * requests. Some step values could eventually be made generic. |
239 | */ | |
240 | struct request_pm_state | |
241 | { | |
242 | /* PM state machine step value, currently driver specific */ | |
243 | int pm_step; | |
244 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
245 | u32 pm_state; | |
246 | void* data; /* for driver use */ | |
247 | }; | |
248 | ||
249 | #include <linux/elevator.h> | |
250 | ||
165125e1 JA |
251 | typedef void (request_fn_proc) (struct request_queue *q); |
252 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
253 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
254 | typedef void (unplug_fn) (struct request_queue *); | |
1da177e4 LT |
255 | |
256 | struct bio_vec; | |
165125e1 | 257 | typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *); |
165125e1 | 258 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 259 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 260 | typedef int (dma_drain_needed_fn)(struct request *); |
1da177e4 LT |
261 | |
262 | enum blk_queue_state { | |
263 | Queue_down, | |
264 | Queue_up, | |
265 | }; | |
266 | ||
1da177e4 LT |
267 | struct blk_queue_tag { |
268 | struct request **tag_index; /* map of busy tags */ | |
269 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
270 | int busy; /* current depth */ |
271 | int max_depth; /* what we will send to device */ | |
ba025082 | 272 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
273 | atomic_t refcnt; /* map can be shared */ |
274 | }; | |
275 | ||
276 | struct request_queue | |
277 | { | |
278 | /* | |
279 | * Together with queue_head for cacheline sharing | |
280 | */ | |
281 | struct list_head queue_head; | |
282 | struct request *last_merge; | |
283 | elevator_t *elevator; | |
284 | ||
285 | /* | |
286 | * the queue request freelist, one for reads and one for writes | |
287 | */ | |
288 | struct request_list rq; | |
289 | ||
290 | request_fn_proc *request_fn; | |
1da177e4 LT |
291 | make_request_fn *make_request_fn; |
292 | prep_rq_fn *prep_rq_fn; | |
293 | unplug_fn *unplug_fn; | |
294 | merge_bvec_fn *merge_bvec_fn; | |
1da177e4 | 295 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 296 | softirq_done_fn *softirq_done_fn; |
2fb98e84 | 297 | dma_drain_needed_fn *dma_drain_needed; |
1da177e4 | 298 | |
8922e16c TH |
299 | /* |
300 | * Dispatch queue sorting | |
301 | */ | |
1b47f531 | 302 | sector_t end_sector; |
8922e16c | 303 | struct request *boundary_rq; |
8922e16c | 304 | |
1da177e4 LT |
305 | /* |
306 | * Auto-unplugging state | |
307 | */ | |
308 | struct timer_list unplug_timer; | |
309 | int unplug_thresh; /* After this many requests */ | |
310 | unsigned long unplug_delay; /* After this many jiffies */ | |
311 | struct work_struct unplug_work; | |
312 | ||
313 | struct backing_dev_info backing_dev_info; | |
314 | ||
315 | /* | |
316 | * The queue owner gets to use this for whatever they like. | |
317 | * ll_rw_blk doesn't touch it. | |
318 | */ | |
319 | void *queuedata; | |
320 | ||
1da177e4 LT |
321 | /* |
322 | * queue needs bounce pages for pages above this limit | |
323 | */ | |
324 | unsigned long bounce_pfn; | |
8267e268 | 325 | gfp_t bounce_gfp; |
1da177e4 LT |
326 | |
327 | /* | |
328 | * various queue flags, see QUEUE_* below | |
329 | */ | |
330 | unsigned long queue_flags; | |
331 | ||
332 | /* | |
152587de JA |
333 | * protects queue structures from reentrancy. ->__queue_lock should |
334 | * _never_ be used directly, it is queue private. always use | |
335 | * ->queue_lock. | |
1da177e4 | 336 | */ |
152587de | 337 | spinlock_t __queue_lock; |
1da177e4 LT |
338 | spinlock_t *queue_lock; |
339 | ||
340 | /* | |
341 | * queue kobject | |
342 | */ | |
343 | struct kobject kobj; | |
344 | ||
345 | /* | |
346 | * queue settings | |
347 | */ | |
348 | unsigned long nr_requests; /* Max # of requests */ | |
349 | unsigned int nr_congestion_on; | |
350 | unsigned int nr_congestion_off; | |
351 | unsigned int nr_batching; | |
352 | ||
2cb2e147 JA |
353 | unsigned int max_sectors; |
354 | unsigned int max_hw_sectors; | |
1da177e4 LT |
355 | unsigned short max_phys_segments; |
356 | unsigned short max_hw_segments; | |
357 | unsigned short hardsect_size; | |
358 | unsigned int max_segment_size; | |
359 | ||
360 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
361 | void *dma_drain_buffer; |
362 | unsigned int dma_drain_size; | |
e3790c7d | 363 | unsigned int dma_pad_mask; |
1da177e4 LT |
364 | unsigned int dma_alignment; |
365 | ||
366 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 367 | struct list_head tag_busy_list; |
1da177e4 | 368 | |
15853af9 | 369 | unsigned int nr_sorted; |
1da177e4 LT |
370 | unsigned int in_flight; |
371 | ||
372 | /* | |
373 | * sg stuff | |
374 | */ | |
375 | unsigned int sg_timeout; | |
376 | unsigned int sg_reserved_size; | |
1946089a | 377 | int node; |
6c5c9341 | 378 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 379 | struct blk_trace *blk_trace; |
6c5c9341 | 380 | #endif |
1da177e4 LT |
381 | /* |
382 | * reserved for flush operations | |
383 | */ | |
797e7dbb TH |
384 | unsigned int ordered, next_ordered, ordseq; |
385 | int orderr, ordcolor; | |
386 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
387 | struct request *orig_bar_rq; | |
483f4afc AV |
388 | |
389 | struct mutex sysfs_lock; | |
d351af01 FT |
390 | |
391 | #if defined(CONFIG_BLK_DEV_BSG) | |
392 | struct bsg_class_device bsg_dev; | |
393 | #endif | |
1da177e4 LT |
394 | }; |
395 | ||
1da177e4 LT |
396 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
397 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
398 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
4e97182a QY |
399 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
400 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
401 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
402 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
403 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 404 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 405 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 406 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
797e7dbb | 407 | |
8f45c1a5 LT |
408 | static inline int queue_is_locked(struct request_queue *q) |
409 | { | |
7663c1e2 | 410 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
411 | spinlock_t *lock = q->queue_lock; |
412 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
413 | #else |
414 | return 1; | |
415 | #endif | |
8f45c1a5 LT |
416 | } |
417 | ||
75ad23bc NP |
418 | static inline void queue_flag_set_unlocked(unsigned int flag, |
419 | struct request_queue *q) | |
420 | { | |
421 | __set_bit(flag, &q->queue_flags); | |
422 | } | |
423 | ||
424 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) | |
425 | { | |
8f45c1a5 | 426 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
427 | __set_bit(flag, &q->queue_flags); |
428 | } | |
429 | ||
430 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
431 | struct request_queue *q) | |
432 | { | |
433 | __clear_bit(flag, &q->queue_flags); | |
434 | } | |
435 | ||
436 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
437 | { | |
8f45c1a5 | 438 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
439 | __clear_bit(flag, &q->queue_flags); |
440 | } | |
441 | ||
797e7dbb TH |
442 | enum { |
443 | /* | |
444 | * Hardbarrier is supported with one of the following methods. | |
445 | * | |
446 | * NONE : hardbarrier unsupported | |
447 | * DRAIN : ordering by draining is enough | |
448 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
449 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
450 | * TAG : ordering by tag is enough | |
451 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
452 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
453 | */ | |
454 | QUEUE_ORDERED_NONE = 0x00, | |
455 | QUEUE_ORDERED_DRAIN = 0x01, | |
456 | QUEUE_ORDERED_TAG = 0x02, | |
457 | ||
458 | QUEUE_ORDERED_PREFLUSH = 0x10, | |
459 | QUEUE_ORDERED_POSTFLUSH = 0x20, | |
460 | QUEUE_ORDERED_FUA = 0x40, | |
461 | ||
462 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | | |
463 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
464 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
465 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
466 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | | |
467 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
468 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
469 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
470 | ||
471 | /* | |
472 | * Ordered operation sequence | |
473 | */ | |
474 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
475 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
476 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
477 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
478 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
479 | QUEUE_ORDSEQ_DONE = 0x20, | |
480 | }; | |
1da177e4 LT |
481 | |
482 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
483 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
484 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 485 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
797e7dbb | 486 | #define blk_queue_flushing(q) ((q)->ordseq) |
1da177e4 | 487 | |
4aff5e23 JA |
488 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
489 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
490 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
491 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
492 | ||
493 | #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST) | |
494 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) | |
1da177e4 LT |
495 | |
496 | #define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq)) | |
497 | ||
4aff5e23 JA |
498 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
499 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 500 | #define blk_pm_request(rq) \ |
4aff5e23 | 501 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 502 | |
4aff5e23 JA |
503 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
504 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
505 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
abae1fde | 506 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
bf2de6f5 | 507 | #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) |
336cdb40 KU |
508 | /* rq->queuelist of dequeued request must be list_empty() */ |
509 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
510 | |
511 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
512 | ||
4aff5e23 | 513 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 514 | |
9e2585a8 JA |
515 | /* |
516 | * We regard a request as sync, if it's a READ or a SYNC write. | |
517 | */ | |
518 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) | |
5404bc7a | 519 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
9e2585a8 | 520 | |
1da177e4 LT |
521 | static inline int blk_queue_full(struct request_queue *q, int rw) |
522 | { | |
523 | if (rw == READ) | |
524 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); | |
525 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); | |
526 | } | |
527 | ||
528 | static inline void blk_set_queue_full(struct request_queue *q, int rw) | |
529 | { | |
530 | if (rw == READ) | |
75ad23bc | 531 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
1da177e4 | 532 | else |
75ad23bc | 533 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
534 | } |
535 | ||
536 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) | |
537 | { | |
538 | if (rw == READ) | |
75ad23bc | 539 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
1da177e4 | 540 | else |
75ad23bc | 541 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
542 | } |
543 | ||
544 | ||
545 | /* | |
546 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
547 | * it already be started by driver. | |
548 | */ | |
549 | #define RQ_NOMERGE_FLAGS \ | |
550 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
551 | #define rq_mergeable(rq) \ | |
4aff5e23 | 552 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq))) |
1da177e4 | 553 | |
1da177e4 LT |
554 | /* |
555 | * q->prep_rq_fn return values | |
556 | */ | |
557 | #define BLKPREP_OK 0 /* serve it */ | |
558 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
559 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
560 | ||
561 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
562 | ||
563 | /* | |
564 | * standard bounce addresses: | |
565 | * | |
566 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
567 | * BLK_BOUNCE_ANY : don't bounce anything | |
568 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
569 | */ | |
2472892a AK |
570 | |
571 | #if BITS_PER_LONG == 32 | |
1da177e4 | 572 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
573 | #else |
574 | #define BLK_BOUNCE_HIGH -1ULL | |
575 | #endif | |
576 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
577 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
578 | ||
3d6392cf JA |
579 | /* |
580 | * default timeout for SG_IO if none specified | |
581 | */ | |
582 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
583 | ||
2a7326b5 | 584 | #ifdef CONFIG_BOUNCE |
1da177e4 | 585 | extern int init_emergency_isa_pool(void); |
165125e1 | 586 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
587 | #else |
588 | static inline int init_emergency_isa_pool(void) | |
589 | { | |
590 | return 0; | |
591 | } | |
165125e1 | 592 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
593 | { |
594 | } | |
595 | #endif /* CONFIG_MMU */ | |
596 | ||
5705f702 N |
597 | struct req_iterator { |
598 | int i; | |
599 | struct bio *bio; | |
600 | }; | |
601 | ||
602 | /* This should not be used directly - use rq_for_each_segment */ | |
603 | #define __rq_for_each_bio(_bio, rq) \ | |
1da177e4 LT |
604 | if ((rq->bio)) \ |
605 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
606 | ||
5705f702 N |
607 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
608 | __rq_for_each_bio(_iter.bio, _rq) \ | |
609 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
610 | ||
611 | #define rq_iter_last(rq, _iter) \ | |
612 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
613 | ||
1da177e4 LT |
614 | extern int blk_register_queue(struct gendisk *disk); |
615 | extern void blk_unregister_queue(struct gendisk *disk); | |
616 | extern void register_disk(struct gendisk *dev); | |
617 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 618 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 619 | extern void blk_put_request(struct request *); |
165125e1 | 620 | extern void __blk_put_request(struct request_queue *, struct request *); |
8ffdc655 | 621 | extern void blk_end_sync_rq(struct request *rq, int error); |
165125e1 JA |
622 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
623 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
624 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
625 | extern void blk_plug_device(struct request_queue *); | |
626 | extern int blk_remove_plug(struct request_queue *); | |
627 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
45e79a3a FT |
628 | extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |
629 | struct gendisk *, unsigned int, void __user *); | |
21b2f0c8 CH |
630 | extern int sg_scsi_ioctl(struct file *, struct request_queue *, |
631 | struct gendisk *, struct scsi_ioctl_command __user *); | |
3fcfab16 | 632 | |
1aa4f24f JA |
633 | /* |
634 | * Temporary export, until SCSI gets fixed up. | |
635 | */ | |
3001ca77 N |
636 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
637 | struct bio *bio); | |
1aa4f24f | 638 | |
3fcfab16 AM |
639 | /* |
640 | * A queue has just exitted congestion. Note this in the global counter of | |
641 | * congested queues, and wake up anyone who was waiting for requests to be | |
642 | * put back. | |
643 | */ | |
165125e1 | 644 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
645 | { |
646 | clear_bdi_congested(&q->backing_dev_info, rw); | |
647 | } | |
648 | ||
649 | /* | |
650 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
651 | * state flags and increment the global gounter of congested queues. | |
652 | */ | |
165125e1 | 653 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
654 | { |
655 | set_bdi_congested(&q->backing_dev_info, rw); | |
656 | } | |
657 | ||
165125e1 JA |
658 | extern void blk_start_queue(struct request_queue *q); |
659 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 660 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 661 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 662 | extern void __blk_run_queue(struct request_queue *); |
165125e1 JA |
663 | extern void blk_run_queue(struct request_queue *); |
664 | extern void blk_start_queueing(struct request_queue *); | |
665 | extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long); | |
8e5cfc45 | 666 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
667 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
668 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
0e75f906 | 669 | struct sg_iovec *, int, unsigned int); |
165125e1 | 670 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 671 | struct request *, int); |
165125e1 | 672 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 673 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 674 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 675 | |
165125e1 | 676 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
677 | { |
678 | return bdev->bd_disk->queue; | |
679 | } | |
680 | ||
681 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
682 | struct page *page) | |
683 | { | |
684 | if (bdi && bdi->unplug_io_fn) | |
685 | bdi->unplug_io_fn(bdi, page); | |
686 | } | |
687 | ||
688 | static inline void blk_run_address_space(struct address_space *mapping) | |
689 | { | |
690 | if (mapping) | |
691 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
692 | } | |
693 | ||
694 | /* | |
3bcddeac KU |
695 | * blk_end_request() and friends. |
696 | * __blk_end_request() and end_request() must be called with | |
697 | * the request queue spinlock acquired. | |
1da177e4 LT |
698 | * |
699 | * Several drivers define their own end_request and call | |
3bcddeac KU |
700 | * blk_end_request() for parts of the original function. |
701 | * This prevents code duplication in drivers. | |
1da177e4 | 702 | */ |
22b13210 JA |
703 | extern int blk_end_request(struct request *rq, int error, |
704 | unsigned int nr_bytes); | |
705 | extern int __blk_end_request(struct request *rq, int error, | |
706 | unsigned int nr_bytes); | |
707 | extern int blk_end_bidi_request(struct request *rq, int error, | |
708 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
a0cd1285 JA |
709 | extern void end_request(struct request *, int); |
710 | extern void end_queued_request(struct request *, int); | |
711 | extern void end_dequeued_request(struct request *, int); | |
22b13210 JA |
712 | extern int blk_end_request_callback(struct request *rq, int error, |
713 | unsigned int nr_bytes, | |
714 | int (drv_callback)(struct request *)); | |
ff856bad JA |
715 | extern void blk_complete_request(struct request *); |
716 | ||
1da177e4 | 717 | /* |
3b11313a KU |
718 | * blk_end_request() takes bytes instead of sectors as a complete size. |
719 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
720 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
1da177e4 | 721 | */ |
3b11313a KU |
722 | extern unsigned int blk_rq_bytes(struct request *rq); |
723 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
1da177e4 LT |
724 | |
725 | static inline void blkdev_dequeue_request(struct request *req) | |
726 | { | |
8922e16c | 727 | elv_dequeue_request(req->q, req); |
1da177e4 | 728 | } |
1da177e4 | 729 | |
1da177e4 LT |
730 | /* |
731 | * Access functions for manipulating queue properties | |
732 | */ | |
165125e1 | 733 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 734 | spinlock_t *lock, int node_id); |
165125e1 JA |
735 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
736 | extern void blk_cleanup_queue(struct request_queue *); | |
737 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
738 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
739 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
740 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
741 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
742 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
743 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
744 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 745 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
746 | extern int blk_queue_dma_drain(struct request_queue *q, |
747 | dma_drain_needed_fn *dma_drain_needed, | |
748 | void *buf, unsigned int size); | |
165125e1 JA |
749 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
750 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
751 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
752 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 753 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 754 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
1da177e4 | 755 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 756 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
165125e1 JA |
757 | extern int blk_do_ordered(struct request_queue *, struct request **); |
758 | extern unsigned blk_ordered_cur_seq(struct request_queue *); | |
797e7dbb | 759 | extern unsigned blk_ordered_req_seq(struct request *); |
165125e1 | 760 | extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 761 | |
165125e1 | 762 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 763 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 JA |
764 | extern void generic_unplug_device(struct request_queue *); |
765 | extern void __generic_unplug_device(struct request_queue *); | |
1da177e4 | 766 | extern long nr_blockdev_pages(void); |
1da177e4 | 767 | |
165125e1 JA |
768 | int blk_get_queue(struct request_queue *); |
769 | struct request_queue *blk_alloc_queue(gfp_t); | |
770 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
771 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
772 | |
773 | /* | |
774 | * tag stuff | |
775 | */ | |
776 | #define blk_queue_tag_depth(q) ((q)->queue_tags->busy) | |
777 | #define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth) | |
4aff5e23 | 778 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
779 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
780 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
781 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
782 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
783 | extern void blk_queue_free_tags(struct request_queue *); | |
784 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
785 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
786 | extern struct blk_queue_tag *blk_init_tags(int); |
787 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 788 | |
f583f492 DS |
789 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
790 | int tag) | |
791 | { | |
792 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
793 | return NULL; | |
794 | return bqt->tag_index[tag]; | |
795 | } | |
796 | ||
1da177e4 LT |
797 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
798 | ||
0b07de85 AG |
799 | /* |
800 | * command filter functions | |
801 | */ | |
802 | extern int blk_verify_command(struct file *file, unsigned char *cmd); | |
803 | extern int blk_cmd_filter_verify_command(struct blk_scsi_cmd_filter *filter, | |
804 | unsigned char *cmd, mode_t *f_mode); | |
805 | extern int blk_register_filter(struct gendisk *disk); | |
806 | extern void blk_unregister_filter(struct gendisk *disk); | |
807 | ||
1da177e4 LT |
808 | #define MAX_PHYS_SEGMENTS 128 |
809 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
810 | #define SAFE_MAX_SECTORS 255 |
811 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
812 | |
813 | #define MAX_SEGMENT_SIZE 65536 | |
814 | ||
815 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) | |
816 | ||
165125e1 | 817 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
818 | { |
819 | int retval = 512; | |
820 | ||
821 | if (q && q->hardsect_size) | |
822 | retval = q->hardsect_size; | |
823 | ||
824 | return retval; | |
825 | } | |
826 | ||
827 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
828 | { | |
829 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
830 | } | |
831 | ||
165125e1 | 832 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 833 | { |
482eb689 | 834 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 LT |
837 | /* assumes size > 256 */ |
838 | static inline unsigned int blksize_bits(unsigned int size) | |
839 | { | |
840 | unsigned int bits = 8; | |
841 | do { | |
842 | bits++; | |
843 | size >>= 1; | |
844 | } while (size > 256); | |
845 | return bits; | |
846 | } | |
847 | ||
2befb9e3 | 848 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
849 | { |
850 | return bdev->bd_block_size; | |
851 | } | |
852 | ||
853 | typedef struct {struct page *v;} Sector; | |
854 | ||
855 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
856 | ||
857 | static inline void put_dev_sector(Sector p) | |
858 | { | |
859 | page_cache_release(p.v); | |
860 | } | |
861 | ||
862 | struct work_struct; | |
863 | int kblockd_schedule_work(struct work_struct *work); | |
19a75d83 | 864 | void kblockd_flush_work(struct work_struct *work); |
1da177e4 | 865 | |
1da177e4 LT |
866 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
867 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
868 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
869 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
870 | ||
7ba1ba12 MP |
871 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
872 | ||
873 | #define INTEGRITY_FLAG_READ 1 /* verify data integrity on read */ | |
874 | #define INTEGRITY_FLAG_WRITE 2 /* generate data integrity on write */ | |
875 | ||
876 | struct blk_integrity_exchg { | |
877 | void *prot_buf; | |
878 | void *data_buf; | |
879 | sector_t sector; | |
880 | unsigned int data_size; | |
881 | unsigned short sector_size; | |
882 | const char *disk_name; | |
883 | }; | |
884 | ||
885 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
886 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
887 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
888 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
889 | ||
890 | struct blk_integrity { | |
891 | integrity_gen_fn *generate_fn; | |
892 | integrity_vrfy_fn *verify_fn; | |
893 | integrity_set_tag_fn *set_tag_fn; | |
894 | integrity_get_tag_fn *get_tag_fn; | |
895 | ||
896 | unsigned short flags; | |
897 | unsigned short tuple_size; | |
898 | unsigned short sector_size; | |
899 | unsigned short tag_size; | |
900 | ||
901 | const char *name; | |
902 | ||
903 | struct kobject kobj; | |
904 | }; | |
905 | ||
906 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
907 | extern void blk_integrity_unregister(struct gendisk *); | |
908 | extern int blk_integrity_compare(struct block_device *, struct block_device *); | |
909 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); | |
910 | extern int blk_rq_count_integrity_sg(struct request *); | |
911 | ||
912 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) | |
913 | { | |
914 | if (bi) | |
915 | return bi->tuple_size; | |
916 | ||
917 | return 0; | |
918 | } | |
919 | ||
920 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
921 | { | |
922 | return bdev->bd_disk->integrity; | |
923 | } | |
924 | ||
925 | static inline unsigned int bdev_get_tag_size(struct block_device *bdev) | |
926 | { | |
927 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
928 | ||
929 | if (bi) | |
930 | return bi->tag_size; | |
931 | ||
932 | return 0; | |
933 | } | |
934 | ||
935 | static inline int bdev_integrity_enabled(struct block_device *bdev, int rw) | |
936 | { | |
937 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
938 | ||
939 | if (bi == NULL) | |
940 | return 0; | |
941 | ||
942 | if (rw == READ && bi->verify_fn != NULL && | |
943 | test_bit(INTEGRITY_FLAG_READ, &bi->flags)) | |
944 | return 1; | |
945 | ||
946 | if (rw == WRITE && bi->generate_fn != NULL && | |
947 | test_bit(INTEGRITY_FLAG_WRITE, &bi->flags)) | |
948 | return 1; | |
949 | ||
950 | return 0; | |
951 | } | |
952 | ||
953 | static inline int blk_integrity_rq(struct request *rq) | |
954 | { | |
7ba1ba12 MP |
955 | return bio_integrity(rq->bio); |
956 | } | |
957 | ||
958 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
959 | ||
960 | #define blk_integrity_rq(rq) (0) | |
961 | #define blk_rq_count_integrity_sg(a) (0) | |
962 | #define blk_rq_map_integrity_sg(a, b) (0) | |
963 | #define bdev_get_integrity(a) (0) | |
964 | #define bdev_get_tag_size(a) (0) | |
965 | #define blk_integrity_compare(a, b) (0) | |
966 | #define blk_integrity_register(a, b) (0) | |
967 | #define blk_integrity_unregister(a) do { } while (0); | |
968 | ||
969 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
970 | ||
9361401e DH |
971 | #else /* CONFIG_BLOCK */ |
972 | /* | |
973 | * stubs for when the block layer is configured out | |
974 | */ | |
975 | #define buffer_heads_over_limit 0 | |
976 | ||
9361401e DH |
977 | static inline long nr_blockdev_pages(void) |
978 | { | |
979 | return 0; | |
980 | } | |
981 | ||
9361401e DH |
982 | #endif /* CONFIG_BLOCK */ |
983 | ||
1da177e4 | 984 | #endif |