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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 | ||
d38ecf93 | 36 | int put_io_context(struct io_context *ioc); |
1da177e4 | 37 | void exit_io_context(void); |
b5deef90 | 38 | struct io_context *get_io_context(gfp_t gfp_flags, int node); |
fd0928df | 39 | struct io_context *alloc_io_context(gfp_t gfp_flags, int node); |
1da177e4 | 40 | void copy_io_context(struct io_context **pdst, struct io_context **psrc); |
1da177e4 LT |
41 | |
42 | struct request; | |
8ffdc655 | 43 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
44 | |
45 | struct request_list { | |
46 | int count[2]; | |
47 | int starved[2]; | |
cb98fc8b | 48 | int elvpriv; |
1da177e4 LT |
49 | mempool_t *rq_pool; |
50 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
51 | }; |
52 | ||
4aff5e23 JA |
53 | /* |
54 | * request command types | |
55 | */ | |
56 | enum rq_cmd_type_bits { | |
57 | REQ_TYPE_FS = 1, /* fs request */ | |
58 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
59 | REQ_TYPE_SENSE, /* sense request */ | |
60 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
61 | REQ_TYPE_PM_RESUME, /* resume request */ | |
62 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
63 | REQ_TYPE_FLUSH, /* flush request */ | |
64 | REQ_TYPE_SPECIAL, /* driver defined type */ | |
65 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
66 | /* | |
67 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
68 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
69 | * private REQ_LB opcodes to differentiate what type of request this is | |
70 | */ | |
4aff5e23 | 71 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 72 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
73 | }; |
74 | ||
75 | /* | |
76 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
77 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
78 | * SCSI cdb. | |
79 | * | |
80 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
81 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
82 | * | |
83 | */ | |
84 | enum { | |
85 | /* | |
86 | * just examples for now | |
87 | */ | |
88 | REQ_LB_OP_EJECT = 0x40, /* eject request */ | |
89 | REQ_LB_OP_FLUSH = 0x41, /* flush device */ | |
90 | }; | |
91 | ||
92 | /* | |
93 | * request type modified bits. first three bits match BIO_RW* bits, important | |
94 | */ | |
95 | enum rq_flag_bits { | |
96 | __REQ_RW, /* not set, read. set, write */ | |
97 | __REQ_FAILFAST, /* no low level driver retries */ | |
98 | __REQ_SORTED, /* elevator knows about this request */ | |
99 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
100 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
101 | __REQ_FUA, /* forced unit access */ | |
102 | __REQ_NOMERGE, /* don't touch this for merging */ | |
103 | __REQ_STARTED, /* drive already may have started this one */ | |
104 | __REQ_DONTPREP, /* don't call prep for this one */ | |
105 | __REQ_QUEUED, /* uses queueing */ | |
106 | __REQ_ELVPRIV, /* elevator private data attached */ | |
107 | __REQ_FAILED, /* set if the request failed */ | |
108 | __REQ_QUIET, /* don't worry about errors */ | |
109 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
110 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
111 | __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ | |
49171e5c | 112 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 113 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 114 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 115 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
4aff5e23 JA |
116 | __REQ_NR_BITS, /* stops here */ |
117 | }; | |
118 | ||
119 | #define REQ_RW (1 << __REQ_RW) | |
120 | #define REQ_FAILFAST (1 << __REQ_FAILFAST) | |
121 | #define REQ_SORTED (1 << __REQ_SORTED) | |
122 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
123 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
124 | #define REQ_FUA (1 << __REQ_FUA) | |
125 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
126 | #define REQ_STARTED (1 << __REQ_STARTED) | |
127 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
128 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
129 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
130 | #define REQ_FAILED (1 << __REQ_FAILED) | |
131 | #define REQ_QUIET (1 << __REQ_QUIET) | |
132 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
133 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
134 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 135 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 136 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 137 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 138 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
4aff5e23 | 139 | |
1da177e4 LT |
140 | #define BLK_MAX_CDB 16 |
141 | ||
142 | /* | |
63a71386 JA |
143 | * try to put the fields that are referenced together in the same cacheline. |
144 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
145 | * as well! | |
1da177e4 LT |
146 | */ |
147 | struct request { | |
ff856bad JA |
148 | struct list_head queuelist; |
149 | struct list_head donelist; | |
150 | ||
165125e1 | 151 | struct request_queue *q; |
e6a1c874 | 152 | |
4aff5e23 JA |
153 | unsigned int cmd_flags; |
154 | enum rq_cmd_type_bits cmd_type; | |
1da177e4 LT |
155 | |
156 | /* Maintain bio traversal state for part by part I/O submission. | |
157 | * hard_* are block layer internals, no driver should touch them! | |
158 | */ | |
159 | ||
160 | sector_t sector; /* next sector to submit */ | |
e6a1c874 | 161 | sector_t hard_sector; /* next sector to complete */ |
1da177e4 | 162 | unsigned long nr_sectors; /* no. of sectors left to submit */ |
e6a1c874 | 163 | unsigned long hard_nr_sectors; /* no. of sectors left to complete */ |
1da177e4 LT |
164 | /* no. of sectors left to submit in the current segment */ |
165 | unsigned int current_nr_sectors; | |
166 | ||
1da177e4 LT |
167 | /* no. of sectors left to complete in the current segment */ |
168 | unsigned int hard_cur_sectors; | |
169 | ||
170 | struct bio *bio; | |
171 | struct bio *biotail; | |
172 | ||
9817064b | 173 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
174 | /* |
175 | * The rb_node is only used inside the io scheduler, requests | |
176 | * are pruned when moved to the dispatch queue. So let the | |
177 | * completion_data share space with the rb_node. | |
178 | */ | |
179 | union { | |
180 | struct rb_node rb_node; /* sort/lookup */ | |
181 | void *completion_data; | |
182 | }; | |
9817064b | 183 | |
ff7d145f JA |
184 | /* |
185 | * two pointers are available for the IO schedulers, if they need | |
186 | * more they have to dynamically allocate it. | |
187 | */ | |
1da177e4 | 188 | void *elevator_private; |
ff7d145f JA |
189 | void *elevator_private2; |
190 | ||
8f34ee75 | 191 | struct gendisk *rq_disk; |
1da177e4 LT |
192 | unsigned long start_time; |
193 | ||
194 | /* Number of scatter-gather DMA addr+len pairs after | |
195 | * physical address coalescing is performed. | |
196 | */ | |
197 | unsigned short nr_phys_segments; | |
198 | ||
199 | /* Number of scatter-gather addr+len pairs after | |
200 | * physical and DMA remapping hardware coalescing is performed. | |
201 | * This is the number of scatter-gather entries the driver | |
202 | * will actually have to deal with after DMA mapping is done. | |
203 | */ | |
204 | unsigned short nr_hw_segments; | |
205 | ||
8f34ee75 JA |
206 | unsigned short ioprio; |
207 | ||
1da177e4 | 208 | void *special; |
8f34ee75 | 209 | char *buffer; |
1da177e4 | 210 | |
cdd60262 JA |
211 | int tag; |
212 | int errors; | |
213 | ||
214 | int ref_count; | |
215 | ||
1da177e4 LT |
216 | /* |
217 | * when request is used as a packet command carrier | |
218 | */ | |
d7e3c324 FT |
219 | unsigned short cmd_len; |
220 | unsigned char __cmd[BLK_MAX_CDB]; | |
221 | unsigned char *cmd; | |
1da177e4 LT |
222 | |
223 | unsigned int data_len; | |
7a85f889 | 224 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 225 | unsigned int sense_len; |
8f34ee75 | 226 | void *data; |
1da177e4 LT |
227 | void *sense; |
228 | ||
229 | unsigned int timeout; | |
17e01f21 | 230 | int retries; |
1da177e4 | 231 | |
1da177e4 | 232 | /* |
c00895ab | 233 | * completion callback. |
1da177e4 LT |
234 | */ |
235 | rq_end_io_fn *end_io; | |
236 | void *end_io_data; | |
abae1fde FT |
237 | |
238 | /* for bidi */ | |
239 | struct request *next_rq; | |
1da177e4 LT |
240 | }; |
241 | ||
242 | /* | |
4aff5e23 | 243 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
244 | * requests. Some step values could eventually be made generic. |
245 | */ | |
246 | struct request_pm_state | |
247 | { | |
248 | /* PM state machine step value, currently driver specific */ | |
249 | int pm_step; | |
250 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
251 | u32 pm_state; | |
252 | void* data; /* for driver use */ | |
253 | }; | |
254 | ||
255 | #include <linux/elevator.h> | |
256 | ||
165125e1 JA |
257 | typedef void (request_fn_proc) (struct request_queue *q); |
258 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
259 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
260 | typedef void (unplug_fn) (struct request_queue *); | |
1da177e4 LT |
261 | |
262 | struct bio_vec; | |
165125e1 | 263 | typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *); |
165125e1 | 264 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 265 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 266 | typedef int (dma_drain_needed_fn)(struct request *); |
1da177e4 LT |
267 | |
268 | enum blk_queue_state { | |
269 | Queue_down, | |
270 | Queue_up, | |
271 | }; | |
272 | ||
1da177e4 LT |
273 | struct blk_queue_tag { |
274 | struct request **tag_index; /* map of busy tags */ | |
275 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
276 | int busy; /* current depth */ |
277 | int max_depth; /* what we will send to device */ | |
ba025082 | 278 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
279 | atomic_t refcnt; /* map can be shared */ |
280 | }; | |
281 | ||
282 | struct request_queue | |
283 | { | |
284 | /* | |
285 | * Together with queue_head for cacheline sharing | |
286 | */ | |
287 | struct list_head queue_head; | |
288 | struct request *last_merge; | |
289 | elevator_t *elevator; | |
290 | ||
291 | /* | |
292 | * the queue request freelist, one for reads and one for writes | |
293 | */ | |
294 | struct request_list rq; | |
295 | ||
296 | request_fn_proc *request_fn; | |
1da177e4 LT |
297 | make_request_fn *make_request_fn; |
298 | prep_rq_fn *prep_rq_fn; | |
299 | unplug_fn *unplug_fn; | |
300 | merge_bvec_fn *merge_bvec_fn; | |
1da177e4 | 301 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 302 | softirq_done_fn *softirq_done_fn; |
2fb98e84 | 303 | dma_drain_needed_fn *dma_drain_needed; |
1da177e4 | 304 | |
8922e16c TH |
305 | /* |
306 | * Dispatch queue sorting | |
307 | */ | |
1b47f531 | 308 | sector_t end_sector; |
8922e16c | 309 | struct request *boundary_rq; |
8922e16c | 310 | |
1da177e4 LT |
311 | /* |
312 | * Auto-unplugging state | |
313 | */ | |
314 | struct timer_list unplug_timer; | |
315 | int unplug_thresh; /* After this many requests */ | |
316 | unsigned long unplug_delay; /* After this many jiffies */ | |
317 | struct work_struct unplug_work; | |
318 | ||
319 | struct backing_dev_info backing_dev_info; | |
320 | ||
321 | /* | |
322 | * The queue owner gets to use this for whatever they like. | |
323 | * ll_rw_blk doesn't touch it. | |
324 | */ | |
325 | void *queuedata; | |
326 | ||
1da177e4 LT |
327 | /* |
328 | * queue needs bounce pages for pages above this limit | |
329 | */ | |
330 | unsigned long bounce_pfn; | |
8267e268 | 331 | gfp_t bounce_gfp; |
1da177e4 LT |
332 | |
333 | /* | |
334 | * various queue flags, see QUEUE_* below | |
335 | */ | |
336 | unsigned long queue_flags; | |
337 | ||
338 | /* | |
152587de JA |
339 | * protects queue structures from reentrancy. ->__queue_lock should |
340 | * _never_ be used directly, it is queue private. always use | |
341 | * ->queue_lock. | |
1da177e4 | 342 | */ |
152587de | 343 | spinlock_t __queue_lock; |
1da177e4 LT |
344 | spinlock_t *queue_lock; |
345 | ||
346 | /* | |
347 | * queue kobject | |
348 | */ | |
349 | struct kobject kobj; | |
350 | ||
351 | /* | |
352 | * queue settings | |
353 | */ | |
354 | unsigned long nr_requests; /* Max # of requests */ | |
355 | unsigned int nr_congestion_on; | |
356 | unsigned int nr_congestion_off; | |
357 | unsigned int nr_batching; | |
358 | ||
2cb2e147 JA |
359 | unsigned int max_sectors; |
360 | unsigned int max_hw_sectors; | |
1da177e4 LT |
361 | unsigned short max_phys_segments; |
362 | unsigned short max_hw_segments; | |
363 | unsigned short hardsect_size; | |
364 | unsigned int max_segment_size; | |
365 | ||
366 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
367 | void *dma_drain_buffer; |
368 | unsigned int dma_drain_size; | |
e3790c7d | 369 | unsigned int dma_pad_mask; |
1da177e4 LT |
370 | unsigned int dma_alignment; |
371 | ||
372 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 373 | struct list_head tag_busy_list; |
1da177e4 | 374 | |
15853af9 | 375 | unsigned int nr_sorted; |
1da177e4 LT |
376 | unsigned int in_flight; |
377 | ||
378 | /* | |
379 | * sg stuff | |
380 | */ | |
381 | unsigned int sg_timeout; | |
382 | unsigned int sg_reserved_size; | |
1946089a | 383 | int node; |
6c5c9341 | 384 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 385 | struct blk_trace *blk_trace; |
6c5c9341 | 386 | #endif |
1da177e4 LT |
387 | /* |
388 | * reserved for flush operations | |
389 | */ | |
797e7dbb TH |
390 | unsigned int ordered, next_ordered, ordseq; |
391 | int orderr, ordcolor; | |
392 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
393 | struct request *orig_bar_rq; | |
483f4afc AV |
394 | |
395 | struct mutex sysfs_lock; | |
d351af01 FT |
396 | |
397 | #if defined(CONFIG_BLK_DEV_BSG) | |
398 | struct bsg_class_device bsg_dev; | |
399 | #endif | |
1da177e4 LT |
400 | }; |
401 | ||
1da177e4 LT |
402 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
403 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
404 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
4e97182a QY |
405 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
406 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
407 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
408 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
409 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 410 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 411 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 412 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
797e7dbb | 413 | |
8f45c1a5 LT |
414 | static inline int queue_is_locked(struct request_queue *q) |
415 | { | |
7663c1e2 | 416 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
417 | spinlock_t *lock = q->queue_lock; |
418 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
419 | #else |
420 | return 1; | |
421 | #endif | |
8f45c1a5 LT |
422 | } |
423 | ||
75ad23bc NP |
424 | static inline void queue_flag_set_unlocked(unsigned int flag, |
425 | struct request_queue *q) | |
426 | { | |
427 | __set_bit(flag, &q->queue_flags); | |
428 | } | |
429 | ||
430 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) | |
431 | { | |
8f45c1a5 | 432 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
433 | __set_bit(flag, &q->queue_flags); |
434 | } | |
435 | ||
436 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
437 | struct request_queue *q) | |
438 | { | |
439 | __clear_bit(flag, &q->queue_flags); | |
440 | } | |
441 | ||
442 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
443 | { | |
8f45c1a5 | 444 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
445 | __clear_bit(flag, &q->queue_flags); |
446 | } | |
447 | ||
797e7dbb TH |
448 | enum { |
449 | /* | |
450 | * Hardbarrier is supported with one of the following methods. | |
451 | * | |
452 | * NONE : hardbarrier unsupported | |
453 | * DRAIN : ordering by draining is enough | |
454 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
455 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
456 | * TAG : ordering by tag is enough | |
457 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
458 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
459 | */ | |
460 | QUEUE_ORDERED_NONE = 0x00, | |
461 | QUEUE_ORDERED_DRAIN = 0x01, | |
462 | QUEUE_ORDERED_TAG = 0x02, | |
463 | ||
464 | QUEUE_ORDERED_PREFLUSH = 0x10, | |
465 | QUEUE_ORDERED_POSTFLUSH = 0x20, | |
466 | QUEUE_ORDERED_FUA = 0x40, | |
467 | ||
468 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | | |
469 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
470 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
471 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
472 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | | |
473 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, | |
474 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
475 | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, | |
476 | ||
477 | /* | |
478 | * Ordered operation sequence | |
479 | */ | |
480 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
481 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
482 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
483 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
484 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
485 | QUEUE_ORDSEQ_DONE = 0x20, | |
486 | }; | |
1da177e4 LT |
487 | |
488 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
489 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
490 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 491 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
797e7dbb | 492 | #define blk_queue_flushing(q) ((q)->ordseq) |
1da177e4 | 493 | |
4aff5e23 JA |
494 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
495 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
496 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
497 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
498 | ||
499 | #define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST) | |
500 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) | |
1da177e4 LT |
501 | |
502 | #define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq)) | |
503 | ||
4aff5e23 JA |
504 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
505 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 506 | #define blk_pm_request(rq) \ |
4aff5e23 | 507 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 508 | |
4aff5e23 JA |
509 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
510 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
511 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
abae1fde | 512 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
bf2de6f5 | 513 | #define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors) |
336cdb40 KU |
514 | /* rq->queuelist of dequeued request must be list_empty() */ |
515 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
516 | |
517 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
518 | ||
4aff5e23 | 519 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 520 | |
9e2585a8 JA |
521 | /* |
522 | * We regard a request as sync, if it's a READ or a SYNC write. | |
523 | */ | |
524 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) | |
5404bc7a | 525 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
9e2585a8 | 526 | |
1da177e4 LT |
527 | static inline int blk_queue_full(struct request_queue *q, int rw) |
528 | { | |
529 | if (rw == READ) | |
530 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); | |
531 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); | |
532 | } | |
533 | ||
534 | static inline void blk_set_queue_full(struct request_queue *q, int rw) | |
535 | { | |
536 | if (rw == READ) | |
75ad23bc | 537 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
1da177e4 | 538 | else |
75ad23bc | 539 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
540 | } |
541 | ||
542 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) | |
543 | { | |
544 | if (rw == READ) | |
75ad23bc | 545 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
1da177e4 | 546 | else |
75ad23bc | 547 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
548 | } |
549 | ||
550 | ||
551 | /* | |
552 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
553 | * it already be started by driver. | |
554 | */ | |
555 | #define RQ_NOMERGE_FLAGS \ | |
556 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
557 | #define rq_mergeable(rq) \ | |
4aff5e23 | 558 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq))) |
1da177e4 | 559 | |
1da177e4 LT |
560 | /* |
561 | * q->prep_rq_fn return values | |
562 | */ | |
563 | #define BLKPREP_OK 0 /* serve it */ | |
564 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
565 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
566 | ||
567 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
568 | ||
569 | /* | |
570 | * standard bounce addresses: | |
571 | * | |
572 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
573 | * BLK_BOUNCE_ANY : don't bounce anything | |
574 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
575 | */ | |
2472892a AK |
576 | |
577 | #if BITS_PER_LONG == 32 | |
1da177e4 | 578 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
579 | #else |
580 | #define BLK_BOUNCE_HIGH -1ULL | |
581 | #endif | |
582 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
583 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
584 | ||
3d6392cf JA |
585 | /* |
586 | * default timeout for SG_IO if none specified | |
587 | */ | |
588 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
589 | ||
2a7326b5 | 590 | #ifdef CONFIG_BOUNCE |
1da177e4 | 591 | extern int init_emergency_isa_pool(void); |
165125e1 | 592 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
593 | #else |
594 | static inline int init_emergency_isa_pool(void) | |
595 | { | |
596 | return 0; | |
597 | } | |
165125e1 | 598 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
599 | { |
600 | } | |
601 | #endif /* CONFIG_MMU */ | |
602 | ||
5705f702 N |
603 | struct req_iterator { |
604 | int i; | |
605 | struct bio *bio; | |
606 | }; | |
607 | ||
608 | /* This should not be used directly - use rq_for_each_segment */ | |
609 | #define __rq_for_each_bio(_bio, rq) \ | |
1da177e4 LT |
610 | if ((rq->bio)) \ |
611 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
612 | ||
5705f702 N |
613 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
614 | __rq_for_each_bio(_iter.bio, _rq) \ | |
615 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
616 | ||
617 | #define rq_iter_last(rq, _iter) \ | |
618 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
619 | ||
1da177e4 LT |
620 | extern int blk_register_queue(struct gendisk *disk); |
621 | extern void blk_unregister_queue(struct gendisk *disk); | |
622 | extern void register_disk(struct gendisk *dev); | |
623 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 624 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 625 | extern void blk_put_request(struct request *); |
165125e1 | 626 | extern void __blk_put_request(struct request_queue *, struct request *); |
8ffdc655 | 627 | extern void blk_end_sync_rq(struct request *rq, int error); |
165125e1 JA |
628 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
629 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
630 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
631 | extern void blk_plug_device(struct request_queue *); | |
632 | extern int blk_remove_plug(struct request_queue *); | |
633 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
45e79a3a FT |
634 | extern int scsi_cmd_ioctl(struct file *, struct request_queue *, |
635 | struct gendisk *, unsigned int, void __user *); | |
21b2f0c8 CH |
636 | extern int sg_scsi_ioctl(struct file *, struct request_queue *, |
637 | struct gendisk *, struct scsi_ioctl_command __user *); | |
3fcfab16 | 638 | |
1aa4f24f JA |
639 | /* |
640 | * Temporary export, until SCSI gets fixed up. | |
641 | */ | |
3001ca77 N |
642 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
643 | struct bio *bio); | |
1aa4f24f | 644 | |
3fcfab16 AM |
645 | /* |
646 | * A queue has just exitted congestion. Note this in the global counter of | |
647 | * congested queues, and wake up anyone who was waiting for requests to be | |
648 | * put back. | |
649 | */ | |
165125e1 | 650 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
651 | { |
652 | clear_bdi_congested(&q->backing_dev_info, rw); | |
653 | } | |
654 | ||
655 | /* | |
656 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
657 | * state flags and increment the global gounter of congested queues. | |
658 | */ | |
165125e1 | 659 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
660 | { |
661 | set_bdi_congested(&q->backing_dev_info, rw); | |
662 | } | |
663 | ||
165125e1 JA |
664 | extern void blk_start_queue(struct request_queue *q); |
665 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 666 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 667 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 668 | extern void __blk_run_queue(struct request_queue *); |
165125e1 JA |
669 | extern void blk_run_queue(struct request_queue *); |
670 | extern void blk_start_queueing(struct request_queue *); | |
671 | extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long); | |
8e5cfc45 | 672 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
673 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
674 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
0e75f906 | 675 | struct sg_iovec *, int, unsigned int); |
165125e1 | 676 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 677 | struct request *, int); |
165125e1 | 678 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 679 | struct request *, int, rq_end_io_fn *); |
337ad41d | 680 | extern int blk_verify_command(unsigned char *, int); |
2ad8b1ef | 681 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 682 | |
165125e1 | 683 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
684 | { |
685 | return bdev->bd_disk->queue; | |
686 | } | |
687 | ||
688 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
689 | struct page *page) | |
690 | { | |
691 | if (bdi && bdi->unplug_io_fn) | |
692 | bdi->unplug_io_fn(bdi, page); | |
693 | } | |
694 | ||
695 | static inline void blk_run_address_space(struct address_space *mapping) | |
696 | { | |
697 | if (mapping) | |
698 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
699 | } | |
700 | ||
701 | /* | |
3bcddeac KU |
702 | * blk_end_request() and friends. |
703 | * __blk_end_request() and end_request() must be called with | |
704 | * the request queue spinlock acquired. | |
1da177e4 LT |
705 | * |
706 | * Several drivers define their own end_request and call | |
3bcddeac KU |
707 | * blk_end_request() for parts of the original function. |
708 | * This prevents code duplication in drivers. | |
1da177e4 | 709 | */ |
22b13210 JA |
710 | extern int blk_end_request(struct request *rq, int error, |
711 | unsigned int nr_bytes); | |
712 | extern int __blk_end_request(struct request *rq, int error, | |
713 | unsigned int nr_bytes); | |
714 | extern int blk_end_bidi_request(struct request *rq, int error, | |
715 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
a0cd1285 JA |
716 | extern void end_request(struct request *, int); |
717 | extern void end_queued_request(struct request *, int); | |
718 | extern void end_dequeued_request(struct request *, int); | |
22b13210 JA |
719 | extern int blk_end_request_callback(struct request *rq, int error, |
720 | unsigned int nr_bytes, | |
721 | int (drv_callback)(struct request *)); | |
ff856bad JA |
722 | extern void blk_complete_request(struct request *); |
723 | ||
1da177e4 | 724 | /* |
3b11313a KU |
725 | * blk_end_request() takes bytes instead of sectors as a complete size. |
726 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
727 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
1da177e4 | 728 | */ |
3b11313a KU |
729 | extern unsigned int blk_rq_bytes(struct request *rq); |
730 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
1da177e4 LT |
731 | |
732 | static inline void blkdev_dequeue_request(struct request *req) | |
733 | { | |
8922e16c | 734 | elv_dequeue_request(req->q, req); |
1da177e4 | 735 | } |
1da177e4 | 736 | |
1da177e4 LT |
737 | /* |
738 | * Access functions for manipulating queue properties | |
739 | */ | |
165125e1 | 740 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 741 | spinlock_t *lock, int node_id); |
165125e1 JA |
742 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
743 | extern void blk_cleanup_queue(struct request_queue *); | |
744 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
745 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
746 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
747 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
748 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
749 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
750 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
751 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 752 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
753 | extern int blk_queue_dma_drain(struct request_queue *q, |
754 | dma_drain_needed_fn *dma_drain_needed, | |
755 | void *buf, unsigned int size); | |
165125e1 JA |
756 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
757 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
758 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
759 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 760 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 761 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
1da177e4 | 762 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 763 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
165125e1 JA |
764 | extern int blk_do_ordered(struct request_queue *, struct request **); |
765 | extern unsigned blk_ordered_cur_seq(struct request_queue *); | |
797e7dbb | 766 | extern unsigned blk_ordered_req_seq(struct request *); |
165125e1 | 767 | extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 768 | |
165125e1 | 769 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 770 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 JA |
771 | extern void generic_unplug_device(struct request_queue *); |
772 | extern void __generic_unplug_device(struct request_queue *); | |
1da177e4 | 773 | extern long nr_blockdev_pages(void); |
1da177e4 | 774 | |
165125e1 JA |
775 | int blk_get_queue(struct request_queue *); |
776 | struct request_queue *blk_alloc_queue(gfp_t); | |
777 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
778 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
779 | |
780 | /* | |
781 | * tag stuff | |
782 | */ | |
783 | #define blk_queue_tag_depth(q) ((q)->queue_tags->busy) | |
784 | #define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth) | |
4aff5e23 | 785 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
786 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
787 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
788 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
789 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
790 | extern void blk_queue_free_tags(struct request_queue *); | |
791 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
792 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
793 | extern struct blk_queue_tag *blk_init_tags(int); |
794 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 795 | |
f583f492 DS |
796 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
797 | int tag) | |
798 | { | |
799 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
800 | return NULL; | |
801 | return bqt->tag_index[tag]; | |
802 | } | |
803 | ||
1da177e4 LT |
804 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
805 | ||
806 | #define MAX_PHYS_SEGMENTS 128 | |
807 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
808 | #define SAFE_MAX_SECTORS 255 |
809 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
810 | |
811 | #define MAX_SEGMENT_SIZE 65536 | |
812 | ||
813 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) | |
814 | ||
165125e1 | 815 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
816 | { |
817 | int retval = 512; | |
818 | ||
819 | if (q && q->hardsect_size) | |
820 | retval = q->hardsect_size; | |
821 | ||
822 | return retval; | |
823 | } | |
824 | ||
825 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
826 | { | |
827 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
828 | } | |
829 | ||
165125e1 | 830 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 831 | { |
482eb689 | 832 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
833 | } |
834 | ||
1da177e4 LT |
835 | /* assumes size > 256 */ |
836 | static inline unsigned int blksize_bits(unsigned int size) | |
837 | { | |
838 | unsigned int bits = 8; | |
839 | do { | |
840 | bits++; | |
841 | size >>= 1; | |
842 | } while (size > 256); | |
843 | return bits; | |
844 | } | |
845 | ||
2befb9e3 | 846 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
847 | { |
848 | return bdev->bd_block_size; | |
849 | } | |
850 | ||
851 | typedef struct {struct page *v;} Sector; | |
852 | ||
853 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
854 | ||
855 | static inline void put_dev_sector(Sector p) | |
856 | { | |
857 | page_cache_release(p.v); | |
858 | } | |
859 | ||
860 | struct work_struct; | |
861 | int kblockd_schedule_work(struct work_struct *work); | |
19a75d83 | 862 | void kblockd_flush_work(struct work_struct *work); |
1da177e4 | 863 | |
1da177e4 LT |
864 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
865 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
866 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
867 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
868 | ||
869 | ||
7ba1ba12 MP |
870 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
871 | ||
872 | #define INTEGRITY_FLAG_READ 1 /* verify data integrity on read */ | |
873 | #define INTEGRITY_FLAG_WRITE 2 /* generate data integrity on write */ | |
874 | ||
875 | struct blk_integrity_exchg { | |
876 | void *prot_buf; | |
877 | void *data_buf; | |
878 | sector_t sector; | |
879 | unsigned int data_size; | |
880 | unsigned short sector_size; | |
881 | const char *disk_name; | |
882 | }; | |
883 | ||
884 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
885 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
886 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
887 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
888 | ||
889 | struct blk_integrity { | |
890 | integrity_gen_fn *generate_fn; | |
891 | integrity_vrfy_fn *verify_fn; | |
892 | integrity_set_tag_fn *set_tag_fn; | |
893 | integrity_get_tag_fn *get_tag_fn; | |
894 | ||
895 | unsigned short flags; | |
896 | unsigned short tuple_size; | |
897 | unsigned short sector_size; | |
898 | unsigned short tag_size; | |
899 | ||
900 | const char *name; | |
901 | ||
902 | struct kobject kobj; | |
903 | }; | |
904 | ||
905 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
906 | extern void blk_integrity_unregister(struct gendisk *); | |
907 | extern int blk_integrity_compare(struct block_device *, struct block_device *); | |
908 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); | |
909 | extern int blk_rq_count_integrity_sg(struct request *); | |
910 | ||
911 | static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi) | |
912 | { | |
913 | if (bi) | |
914 | return bi->tuple_size; | |
915 | ||
916 | return 0; | |
917 | } | |
918 | ||
919 | static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
920 | { | |
921 | return bdev->bd_disk->integrity; | |
922 | } | |
923 | ||
924 | static inline unsigned int bdev_get_tag_size(struct block_device *bdev) | |
925 | { | |
926 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
927 | ||
928 | if (bi) | |
929 | return bi->tag_size; | |
930 | ||
931 | return 0; | |
932 | } | |
933 | ||
934 | static inline int bdev_integrity_enabled(struct block_device *bdev, int rw) | |
935 | { | |
936 | struct blk_integrity *bi = bdev_get_integrity(bdev); | |
937 | ||
938 | if (bi == NULL) | |
939 | return 0; | |
940 | ||
941 | if (rw == READ && bi->verify_fn != NULL && | |
942 | test_bit(INTEGRITY_FLAG_READ, &bi->flags)) | |
943 | return 1; | |
944 | ||
945 | if (rw == WRITE && bi->generate_fn != NULL && | |
946 | test_bit(INTEGRITY_FLAG_WRITE, &bi->flags)) | |
947 | return 1; | |
948 | ||
949 | return 0; | |
950 | } | |
951 | ||
952 | static inline int blk_integrity_rq(struct request *rq) | |
953 | { | |
954 | BUG_ON(rq->bio == NULL); | |
955 | ||
956 | return bio_integrity(rq->bio); | |
957 | } | |
958 | ||
959 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
960 | ||
961 | #define blk_integrity_rq(rq) (0) | |
962 | #define blk_rq_count_integrity_sg(a) (0) | |
963 | #define blk_rq_map_integrity_sg(a, b) (0) | |
964 | #define bdev_get_integrity(a) (0) | |
965 | #define bdev_get_tag_size(a) (0) | |
966 | #define blk_integrity_compare(a, b) (0) | |
967 | #define blk_integrity_register(a, b) (0) | |
968 | #define blk_integrity_unregister(a) do { } while (0); | |
969 | ||
970 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
971 | ||
972 | ||
9361401e DH |
973 | #else /* CONFIG_BLOCK */ |
974 | /* | |
975 | * stubs for when the block layer is configured out | |
976 | */ | |
977 | #define buffer_heads_over_limit 0 | |
978 | ||
9361401e DH |
979 | static inline long nr_blockdev_pages(void) |
980 | { | |
981 | return 0; | |
982 | } | |
983 | ||
bcfd8d36 AM |
984 | static inline void exit_io_context(void) |
985 | { | |
986 | } | |
9361401e | 987 | |
023ccde1 | 988 | struct io_context; |
fd0928df JA |
989 | static inline int put_io_context(struct io_context *ioc) |
990 | { | |
991 | return 1; | |
992 | } | |
993 | ||
994 | ||
9361401e DH |
995 | #endif /* CONFIG_BLOCK */ |
996 | ||
1da177e4 | 997 | #endif |