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1da177e4 LT |
1 | #ifndef _LINUX_BLKDEV_H |
2 | #define _LINUX_BLKDEV_H | |
3 | ||
f5ff8422 JA |
4 | #ifdef CONFIG_BLOCK |
5 | ||
bcfd8d36 | 6 | #include <linux/sched.h> |
1da177e4 LT |
7 | #include <linux/major.h> |
8 | #include <linux/genhd.h> | |
9 | #include <linux/list.h> | |
10 | #include <linux/timer.h> | |
11 | #include <linux/workqueue.h> | |
12 | #include <linux/pagemap.h> | |
13 | #include <linux/backing-dev.h> | |
14 | #include <linux/wait.h> | |
15 | #include <linux/mempool.h> | |
16 | #include <linux/bio.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/stringify.h> | |
3e6053d7 | 19 | #include <linux/gfp.h> |
d351af01 | 20 | #include <linux/bsg.h> |
c7c22e4d | 21 | #include <linux/smp.h> |
1da177e4 LT |
22 | |
23 | #include <asm/scatterlist.h> | |
24 | ||
21b2f0c8 CH |
25 | struct scsi_ioctl_command; |
26 | ||
1da177e4 | 27 | struct request_queue; |
1da177e4 | 28 | struct elevator_queue; |
1da177e4 | 29 | struct request_pm_state; |
2056a782 | 30 | struct blk_trace; |
3d6392cf JA |
31 | struct request; |
32 | struct sg_io_hdr; | |
1da177e4 LT |
33 | |
34 | #define BLKDEV_MIN_RQ 4 | |
35 | #define BLKDEV_MAX_RQ 128 /* Default maximum */ | |
36 | ||
1da177e4 | 37 | struct request; |
8ffdc655 | 38 | typedef void (rq_end_io_fn)(struct request *, int); |
1da177e4 LT |
39 | |
40 | struct request_list { | |
41 | int count[2]; | |
42 | int starved[2]; | |
cb98fc8b | 43 | int elvpriv; |
1da177e4 LT |
44 | mempool_t *rq_pool; |
45 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
46 | }; |
47 | ||
4aff5e23 JA |
48 | /* |
49 | * request command types | |
50 | */ | |
51 | enum rq_cmd_type_bits { | |
52 | REQ_TYPE_FS = 1, /* fs request */ | |
53 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
54 | REQ_TYPE_SENSE, /* sense request */ | |
55 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
56 | REQ_TYPE_PM_RESUME, /* resume request */ | |
57 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 JA |
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 { | |
4aff5e23 | 79 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
1a8e2bdd | 80 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
eae9acd1 | 81 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
4aff5e23 JA |
82 | }; |
83 | ||
84 | /* | |
d628eaef | 85 | * request type modified bits. first two bits match BIO_RW* bits, important |
4aff5e23 JA |
86 | */ |
87 | enum rq_flag_bits { | |
88 | __REQ_RW, /* not set, read. set, write */ | |
6000a368 MC |
89 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ |
90 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
91 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
fb2dce86 | 92 | __REQ_DISCARD, /* request to discard sectors */ |
4aff5e23 JA |
93 | __REQ_SORTED, /* elevator knows about this request */ |
94 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
95 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
96 | __REQ_FUA, /* forced unit access */ | |
97 | __REQ_NOMERGE, /* don't touch this for merging */ | |
98 | __REQ_STARTED, /* drive already may have started this one */ | |
99 | __REQ_DONTPREP, /* don't call prep for this one */ | |
100 | __REQ_QUEUED, /* uses queueing */ | |
101 | __REQ_ELVPRIV, /* elevator private data attached */ | |
102 | __REQ_FAILED, /* set if the request failed */ | |
103 | __REQ_QUIET, /* don't worry about errors */ | |
104 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
105 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
106 | __REQ_RW_SYNC, /* request is sync (O_DIRECT) */ | |
49171e5c | 107 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 108 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 109 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 110 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
4aff5e23 JA |
111 | __REQ_NR_BITS, /* stops here */ |
112 | }; | |
113 | ||
114 | #define REQ_RW (1 << __REQ_RW) | |
6000a368 MC |
115 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
116 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) | |
117 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) | |
fb2dce86 | 118 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
4aff5e23 JA |
119 | #define REQ_SORTED (1 << __REQ_SORTED) |
120 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
121 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
122 | #define REQ_FUA (1 << __REQ_FUA) | |
123 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
124 | #define REQ_STARTED (1 << __REQ_STARTED) | |
125 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
126 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
127 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
128 | #define REQ_FAILED (1 << __REQ_FAILED) | |
129 | #define REQ_QUIET (1 << __REQ_QUIET) | |
130 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
131 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
132 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 133 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 134 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 135 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 136 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
4aff5e23 | 137 | |
1da177e4 LT |
138 | #define BLK_MAX_CDB 16 |
139 | ||
140 | /* | |
63a71386 JA |
141 | * try to put the fields that are referenced together in the same cacheline. |
142 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
143 | * as well! | |
1da177e4 LT |
144 | */ |
145 | struct request { | |
ff856bad | 146 | struct list_head queuelist; |
c7c22e4d JA |
147 | struct call_single_data csd; |
148 | int cpu; | |
ff856bad | 149 | |
165125e1 | 150 | struct request_queue *q; |
e6a1c874 | 151 | |
4aff5e23 JA |
152 | unsigned int cmd_flags; |
153 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 154 | unsigned long atomic_flags; |
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 | ||
8f34ee75 JA |
199 | unsigned short ioprio; |
200 | ||
1da177e4 | 201 | void *special; |
8f34ee75 | 202 | char *buffer; |
1da177e4 | 203 | |
cdd60262 JA |
204 | int tag; |
205 | int errors; | |
206 | ||
207 | int ref_count; | |
208 | ||
1da177e4 LT |
209 | /* |
210 | * when request is used as a packet command carrier | |
211 | */ | |
d7e3c324 FT |
212 | unsigned short cmd_len; |
213 | unsigned char __cmd[BLK_MAX_CDB]; | |
214 | unsigned char *cmd; | |
1da177e4 LT |
215 | |
216 | unsigned int data_len; | |
7a85f889 | 217 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 218 | unsigned int sense_len; |
8f34ee75 | 219 | void *data; |
1da177e4 LT |
220 | void *sense; |
221 | ||
242f9dcb JA |
222 | unsigned long deadline; |
223 | struct list_head timeout_list; | |
1da177e4 | 224 | unsigned int timeout; |
17e01f21 | 225 | int retries; |
1da177e4 | 226 | |
1da177e4 | 227 | /* |
c00895ab | 228 | * completion callback. |
1da177e4 LT |
229 | */ |
230 | rq_end_io_fn *end_io; | |
231 | void *end_io_data; | |
abae1fde FT |
232 | |
233 | /* for bidi */ | |
234 | struct request *next_rq; | |
1da177e4 LT |
235 | }; |
236 | ||
766ca442 FLVC |
237 | static inline unsigned short req_get_ioprio(struct request *req) |
238 | { | |
239 | return req->ioprio; | |
240 | } | |
241 | ||
1da177e4 | 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 *); | |
fb2dce86 | 261 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
262 | |
263 | struct bio_vec; | |
cc371e66 AK |
264 | struct bvec_merge_data { |
265 | struct block_device *bi_bdev; | |
266 | sector_t bi_sector; | |
267 | unsigned bi_size; | |
268 | unsigned long bi_rw; | |
269 | }; | |
270 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
271 | struct bio_vec *); | |
165125e1 | 272 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 273 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 274 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 275 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 276 | |
242f9dcb JA |
277 | enum blk_eh_timer_return { |
278 | BLK_EH_NOT_HANDLED, | |
279 | BLK_EH_HANDLED, | |
280 | BLK_EH_RESET_TIMER, | |
281 | }; | |
282 | ||
283 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
284 | ||
1da177e4 LT |
285 | enum blk_queue_state { |
286 | Queue_down, | |
287 | Queue_up, | |
288 | }; | |
289 | ||
1da177e4 LT |
290 | struct blk_queue_tag { |
291 | struct request **tag_index; /* map of busy tags */ | |
292 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
293 | int busy; /* current depth */ |
294 | int max_depth; /* what we will send to device */ | |
ba025082 | 295 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
296 | atomic_t refcnt; /* map can be shared */ |
297 | }; | |
298 | ||
abf54393 FT |
299 | #define BLK_SCSI_MAX_CMDS (256) |
300 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
301 | ||
4beab5c6 | 302 | struct blk_cmd_filter { |
abf54393 FT |
303 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
304 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
305 | struct kobject kobj; | |
306 | }; | |
307 | ||
1da177e4 LT |
308 | struct request_queue |
309 | { | |
310 | /* | |
311 | * Together with queue_head for cacheline sharing | |
312 | */ | |
313 | struct list_head queue_head; | |
314 | struct request *last_merge; | |
b374d18a | 315 | struct elevator_queue *elevator; |
1da177e4 LT |
316 | |
317 | /* | |
318 | * the queue request freelist, one for reads and one for writes | |
319 | */ | |
320 | struct request_list rq; | |
321 | ||
322 | request_fn_proc *request_fn; | |
1da177e4 LT |
323 | make_request_fn *make_request_fn; |
324 | prep_rq_fn *prep_rq_fn; | |
325 | unplug_fn *unplug_fn; | |
fb2dce86 | 326 | prepare_discard_fn *prepare_discard_fn; |
1da177e4 | 327 | merge_bvec_fn *merge_bvec_fn; |
1da177e4 | 328 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 329 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 330 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 331 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 332 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 333 | |
8922e16c TH |
334 | /* |
335 | * Dispatch queue sorting | |
336 | */ | |
1b47f531 | 337 | sector_t end_sector; |
8922e16c | 338 | struct request *boundary_rq; |
8922e16c | 339 | |
1da177e4 LT |
340 | /* |
341 | * Auto-unplugging state | |
342 | */ | |
343 | struct timer_list unplug_timer; | |
344 | int unplug_thresh; /* After this many requests */ | |
345 | unsigned long unplug_delay; /* After this many jiffies */ | |
346 | struct work_struct unplug_work; | |
347 | ||
348 | struct backing_dev_info backing_dev_info; | |
349 | ||
350 | /* | |
351 | * The queue owner gets to use this for whatever they like. | |
352 | * ll_rw_blk doesn't touch it. | |
353 | */ | |
354 | void *queuedata; | |
355 | ||
1da177e4 LT |
356 | /* |
357 | * queue needs bounce pages for pages above this limit | |
358 | */ | |
359 | unsigned long bounce_pfn; | |
8267e268 | 360 | gfp_t bounce_gfp; |
1da177e4 LT |
361 | |
362 | /* | |
363 | * various queue flags, see QUEUE_* below | |
364 | */ | |
365 | unsigned long queue_flags; | |
366 | ||
367 | /* | |
152587de | 368 | * protects queue structures from reentrancy. ->__queue_lock should |
369 | * _never_ be used directly, it is queue private. always use | |
370 | * ->queue_lock. | |
1da177e4 | 371 | */ |
152587de | 372 | spinlock_t __queue_lock; |
1da177e4 LT |
373 | spinlock_t *queue_lock; |
374 | ||
375 | /* | |
376 | * queue kobject | |
377 | */ | |
378 | struct kobject kobj; | |
379 | ||
380 | /* | |
381 | * queue settings | |
382 | */ | |
383 | unsigned long nr_requests; /* Max # of requests */ | |
384 | unsigned int nr_congestion_on; | |
385 | unsigned int nr_congestion_off; | |
386 | unsigned int nr_batching; | |
387 | ||
2cb2e147 JA |
388 | unsigned int max_sectors; |
389 | unsigned int max_hw_sectors; | |
1da177e4 LT |
390 | unsigned short max_phys_segments; |
391 | unsigned short max_hw_segments; | |
392 | unsigned short hardsect_size; | |
393 | unsigned int max_segment_size; | |
394 | ||
395 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
396 | void *dma_drain_buffer; |
397 | unsigned int dma_drain_size; | |
e3790c7d | 398 | unsigned int dma_pad_mask; |
1da177e4 LT |
399 | unsigned int dma_alignment; |
400 | ||
401 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 402 | struct list_head tag_busy_list; |
1da177e4 | 403 | |
15853af9 | 404 | unsigned int nr_sorted; |
1da177e4 LT |
405 | unsigned int in_flight; |
406 | ||
242f9dcb JA |
407 | unsigned int rq_timeout; |
408 | struct timer_list timeout; | |
409 | struct list_head timeout_list; | |
410 | ||
1da177e4 LT |
411 | /* |
412 | * sg stuff | |
413 | */ | |
414 | unsigned int sg_timeout; | |
415 | unsigned int sg_reserved_size; | |
1946089a | 416 | int node; |
6c5c9341 | 417 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 418 | struct blk_trace *blk_trace; |
6c5c9341 | 419 | #endif |
1da177e4 LT |
420 | /* |
421 | * reserved for flush operations | |
422 | */ | |
797e7dbb TH |
423 | unsigned int ordered, next_ordered, ordseq; |
424 | int orderr, ordcolor; | |
425 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
426 | struct request *orig_bar_rq; | |
483f4afc AV |
427 | |
428 | struct mutex sysfs_lock; | |
d351af01 FT |
429 | |
430 | #if defined(CONFIG_BLK_DEV_BSG) | |
431 | struct bsg_class_device bsg_dev; | |
432 | #endif | |
4beab5c6 | 433 | struct blk_cmd_filter cmd_filter; |
1da177e4 LT |
434 | }; |
435 | ||
1da177e4 LT |
436 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
437 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
438 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
4e97182a QY |
439 | #define QUEUE_FLAG_READFULL 3 /* read queue has been filled */ |
440 | #define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
441 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
442 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
443 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 444 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 445 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 446 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 447 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 448 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 449 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 450 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 451 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
797e7dbb | 452 | |
8f45c1a5 LT |
453 | static inline int queue_is_locked(struct request_queue *q) |
454 | { | |
7663c1e2 | 455 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
456 | spinlock_t *lock = q->queue_lock; |
457 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
458 | #else |
459 | return 1; | |
460 | #endif | |
8f45c1a5 LT |
461 | } |
462 | ||
75ad23bc NP |
463 | static inline void queue_flag_set_unlocked(unsigned int flag, |
464 | struct request_queue *q) | |
465 | { | |
466 | __set_bit(flag, &q->queue_flags); | |
467 | } | |
468 | ||
e48ec690 JA |
469 | static inline int queue_flag_test_and_clear(unsigned int flag, |
470 | struct request_queue *q) | |
471 | { | |
472 | WARN_ON_ONCE(!queue_is_locked(q)); | |
473 | ||
474 | if (test_bit(flag, &q->queue_flags)) { | |
475 | __clear_bit(flag, &q->queue_flags); | |
476 | return 1; | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | static inline int queue_flag_test_and_set(unsigned int flag, | |
483 | struct request_queue *q) | |
484 | { | |
485 | WARN_ON_ONCE(!queue_is_locked(q)); | |
486 | ||
487 | if (!test_bit(flag, &q->queue_flags)) { | |
488 | __set_bit(flag, &q->queue_flags); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | return 1; | |
493 | } | |
494 | ||
75ad23bc NP |
495 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
496 | { | |
8f45c1a5 | 497 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
498 | __set_bit(flag, &q->queue_flags); |
499 | } | |
500 | ||
501 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
502 | struct request_queue *q) | |
503 | { | |
504 | __clear_bit(flag, &q->queue_flags); | |
505 | } | |
506 | ||
507 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) | |
508 | { | |
8f45c1a5 | 509 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
510 | __clear_bit(flag, &q->queue_flags); |
511 | } | |
512 | ||
797e7dbb TH |
513 | enum { |
514 | /* | |
515 | * Hardbarrier is supported with one of the following methods. | |
516 | * | |
517 | * NONE : hardbarrier unsupported | |
518 | * DRAIN : ordering by draining is enough | |
519 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
520 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
521 | * TAG : ordering by tag is enough | |
522 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
523 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
524 | */ | |
313e4299 TH |
525 | QUEUE_ORDERED_BY_DRAIN = 0x01, |
526 | QUEUE_ORDERED_BY_TAG = 0x02, | |
527 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, | |
f671620e | 528 | QUEUE_ORDERED_DO_BAR = 0x20, |
313e4299 TH |
529 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
530 | QUEUE_ORDERED_DO_FUA = 0x80, | |
531 | ||
532 | QUEUE_ORDERED_NONE = 0x00, | |
533 | ||
f671620e TH |
534 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
535 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
536 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
537 | QUEUE_ORDERED_DO_PREFLUSH | | |
538 | QUEUE_ORDERED_DO_POSTFLUSH, | |
539 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
540 | QUEUE_ORDERED_DO_PREFLUSH | | |
541 | QUEUE_ORDERED_DO_FUA, | |
542 | ||
f671620e TH |
543 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
544 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
545 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
546 | QUEUE_ORDERED_DO_PREFLUSH | | |
547 | QUEUE_ORDERED_DO_POSTFLUSH, | |
548 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
549 | QUEUE_ORDERED_DO_PREFLUSH | | |
550 | QUEUE_ORDERED_DO_FUA, | |
797e7dbb TH |
551 | |
552 | /* | |
553 | * Ordered operation sequence | |
554 | */ | |
555 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
556 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
557 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
558 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
559 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
560 | QUEUE_ORDSEQ_DONE = 0x20, | |
561 | }; | |
1da177e4 LT |
562 | |
563 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
564 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
565 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 566 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
a68bbddb | 567 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
797e7dbb | 568 | #define blk_queue_flushing(q) ((q)->ordseq) |
4ee5eaf4 KU |
569 | #define blk_queue_stackable(q) \ |
570 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
1da177e4 | 571 | |
4aff5e23 JA |
572 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
573 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
574 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
575 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
576 | ||
6000a368 MC |
577 | #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) |
578 | #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) | |
579 | #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) | |
580 | #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ | |
581 | blk_failfast_transport(rq) || \ | |
582 | blk_failfast_driver(rq)) | |
4aff5e23 | 583 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) |
1da177e4 | 584 | |
e17fc0a1 | 585 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
1da177e4 | 586 | |
4aff5e23 JA |
587 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
588 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 589 | #define blk_pm_request(rq) \ |
4aff5e23 | 590 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 591 | |
ab780f1e | 592 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
4aff5e23 JA |
593 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
594 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
595 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
fb2dce86 | 596 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
abae1fde | 597 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
598 | /* rq->queuelist of dequeued request must be list_empty() */ |
599 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
600 | |
601 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
602 | ||
4aff5e23 | 603 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 604 | |
9e2585a8 JA |
605 | /* |
606 | * We regard a request as sync, if it's a READ or a SYNC write. | |
607 | */ | |
608 | #define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC) | |
5404bc7a | 609 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
9e2585a8 | 610 | |
1da177e4 LT |
611 | static inline int blk_queue_full(struct request_queue *q, int rw) |
612 | { | |
613 | if (rw == READ) | |
614 | return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); | |
615 | return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); | |
616 | } | |
617 | ||
618 | static inline void blk_set_queue_full(struct request_queue *q, int rw) | |
619 | { | |
620 | if (rw == READ) | |
75ad23bc | 621 | queue_flag_set(QUEUE_FLAG_READFULL, q); |
1da177e4 | 622 | else |
75ad23bc | 623 | queue_flag_set(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
624 | } |
625 | ||
626 | static inline void blk_clear_queue_full(struct request_queue *q, int rw) | |
627 | { | |
628 | if (rw == READ) | |
75ad23bc | 629 | queue_flag_clear(QUEUE_FLAG_READFULL, q); |
1da177e4 | 630 | else |
75ad23bc | 631 | queue_flag_clear(QUEUE_FLAG_WRITEFULL, q); |
1da177e4 LT |
632 | } |
633 | ||
634 | ||
635 | /* | |
636 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
637 | * it already be started by driver. | |
638 | */ | |
639 | #define RQ_NOMERGE_FLAGS \ | |
640 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
641 | #define rq_mergeable(rq) \ | |
e17fc0a1 DW |
642 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
643 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
1da177e4 | 644 | |
1da177e4 LT |
645 | /* |
646 | * q->prep_rq_fn return values | |
647 | */ | |
648 | #define BLKPREP_OK 0 /* serve it */ | |
649 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
650 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
651 | ||
652 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
653 | ||
654 | /* | |
655 | * standard bounce addresses: | |
656 | * | |
657 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
658 | * BLK_BOUNCE_ANY : don't bounce anything | |
659 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
660 | */ | |
2472892a AK |
661 | |
662 | #if BITS_PER_LONG == 32 | |
1da177e4 | 663 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
664 | #else |
665 | #define BLK_BOUNCE_HIGH -1ULL | |
666 | #endif | |
667 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
668 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
669 | ||
3d6392cf JA |
670 | /* |
671 | * default timeout for SG_IO if none specified | |
672 | */ | |
673 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 674 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 675 | |
2a7326b5 | 676 | #ifdef CONFIG_BOUNCE |
1da177e4 | 677 | extern int init_emergency_isa_pool(void); |
165125e1 | 678 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
679 | #else |
680 | static inline int init_emergency_isa_pool(void) | |
681 | { | |
682 | return 0; | |
683 | } | |
165125e1 | 684 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
685 | { |
686 | } | |
687 | #endif /* CONFIG_MMU */ | |
688 | ||
152e283f FT |
689 | struct rq_map_data { |
690 | struct page **pages; | |
691 | int page_order; | |
692 | int nr_entries; | |
693 | }; | |
694 | ||
5705f702 N |
695 | struct req_iterator { |
696 | int i; | |
697 | struct bio *bio; | |
698 | }; | |
699 | ||
700 | /* This should not be used directly - use rq_for_each_segment */ | |
701 | #define __rq_for_each_bio(_bio, rq) \ | |
1da177e4 LT |
702 | if ((rq->bio)) \ |
703 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
704 | ||
5705f702 N |
705 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
706 | __rq_for_each_bio(_iter.bio, _rq) \ | |
707 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
708 | ||
709 | #define rq_iter_last(rq, _iter) \ | |
710 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
711 | ||
1da177e4 LT |
712 | extern int blk_register_queue(struct gendisk *disk); |
713 | extern void blk_unregister_queue(struct gendisk *disk); | |
714 | extern void register_disk(struct gendisk *dev); | |
715 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 716 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 717 | extern void blk_put_request(struct request *); |
165125e1 | 718 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 JA |
719 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
720 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
721 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 | 722 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 723 | extern int blk_lld_busy(struct request_queue *q); |
82124d60 KU |
724 | extern int blk_insert_cloned_request(struct request_queue *q, |
725 | struct request *rq); | |
165125e1 | 726 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 727 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
728 | extern int blk_remove_plug(struct request_queue *); |
729 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
730 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
731 | unsigned int, void __user *); | |
e915e872 AV |
732 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
733 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 734 | |
1aa4f24f JA |
735 | /* |
736 | * Temporary export, until SCSI gets fixed up. | |
737 | */ | |
3001ca77 N |
738 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
739 | struct bio *bio); | |
1aa4f24f | 740 | |
3fcfab16 AM |
741 | /* |
742 | * A queue has just exitted congestion. Note this in the global counter of | |
743 | * congested queues, and wake up anyone who was waiting for requests to be | |
744 | * put back. | |
745 | */ | |
165125e1 | 746 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
747 | { |
748 | clear_bdi_congested(&q->backing_dev_info, rw); | |
749 | } | |
750 | ||
751 | /* | |
752 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
753 | * state flags and increment the global gounter of congested queues. | |
754 | */ | |
165125e1 | 755 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
756 | { |
757 | set_bdi_congested(&q->backing_dev_info, rw); | |
758 | } | |
759 | ||
165125e1 JA |
760 | extern void blk_start_queue(struct request_queue *q); |
761 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 762 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 763 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 764 | extern void __blk_run_queue(struct request_queue *); |
165125e1 JA |
765 | extern void blk_run_queue(struct request_queue *); |
766 | extern void blk_start_queueing(struct request_queue *); | |
a3bce90e | 767 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
768 | struct rq_map_data *, void __user *, unsigned long, |
769 | gfp_t); | |
8e5cfc45 | 770 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
771 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
772 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
773 | struct rq_map_data *, struct sg_iovec *, int, |
774 | unsigned int, gfp_t); | |
165125e1 | 775 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 776 | struct request *, int); |
165125e1 | 777 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 778 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 779 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 780 | |
165125e1 | 781 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
782 | { |
783 | return bdev->bd_disk->queue; | |
784 | } | |
785 | ||
786 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
787 | struct page *page) | |
788 | { | |
789 | if (bdi && bdi->unplug_io_fn) | |
790 | bdi->unplug_io_fn(bdi, page); | |
791 | } | |
792 | ||
793 | static inline void blk_run_address_space(struct address_space *mapping) | |
794 | { | |
795 | if (mapping) | |
796 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
797 | } | |
798 | ||
53a08807 TH |
799 | extern void blkdev_dequeue_request(struct request *req); |
800 | ||
1da177e4 | 801 | /* |
3bcddeac KU |
802 | * blk_end_request() and friends. |
803 | * __blk_end_request() and end_request() must be called with | |
804 | * the request queue spinlock acquired. | |
1da177e4 LT |
805 | * |
806 | * Several drivers define their own end_request and call | |
3bcddeac KU |
807 | * blk_end_request() for parts of the original function. |
808 | * This prevents code duplication in drivers. | |
1da177e4 | 809 | */ |
22b13210 JA |
810 | extern int blk_end_request(struct request *rq, int error, |
811 | unsigned int nr_bytes); | |
812 | extern int __blk_end_request(struct request *rq, int error, | |
813 | unsigned int nr_bytes); | |
814 | extern int blk_end_bidi_request(struct request *rq, int error, | |
815 | unsigned int nr_bytes, unsigned int bidi_bytes); | |
a0cd1285 | 816 | extern void end_request(struct request *, int); |
22b13210 JA |
817 | extern int blk_end_request_callback(struct request *rq, int error, |
818 | unsigned int nr_bytes, | |
819 | int (drv_callback)(struct request *)); | |
ff856bad | 820 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
821 | extern void __blk_complete_request(struct request *); |
822 | extern void blk_abort_request(struct request *); | |
11914a53 | 823 | extern void blk_abort_queue(struct request_queue *); |
32fab448 KU |
824 | extern void blk_update_request(struct request *rq, int error, |
825 | unsigned int nr_bytes); | |
ff856bad | 826 | |
1da177e4 | 827 | /* |
3b11313a KU |
828 | * blk_end_request() takes bytes instead of sectors as a complete size. |
829 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
830 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
1da177e4 | 831 | */ |
3b11313a KU |
832 | extern unsigned int blk_rq_bytes(struct request *rq); |
833 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
1da177e4 | 834 | |
1da177e4 LT |
835 | /* |
836 | * Access functions for manipulating queue properties | |
837 | */ | |
165125e1 | 838 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 839 | spinlock_t *lock, int node_id); |
165125e1 JA |
840 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
841 | extern void blk_cleanup_queue(struct request_queue *); | |
842 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
843 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
844 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
845 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
846 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
847 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
848 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
849 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 850 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 851 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
852 | extern int blk_queue_dma_drain(struct request_queue *q, |
853 | dma_drain_needed_fn *dma_drain_needed, | |
854 | void *buf, unsigned int size); | |
ef9e3fac | 855 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
856 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
857 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
858 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
859 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 860 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 861 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
fb2dce86 | 862 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
242f9dcb JA |
863 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
864 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 865 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 866 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
8f11b3e9 | 867 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 868 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 869 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 870 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 871 | |
165125e1 | 872 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 873 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 874 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 875 | extern long nr_blockdev_pages(void); |
1da177e4 | 876 | |
165125e1 JA |
877 | int blk_get_queue(struct request_queue *); |
878 | struct request_queue *blk_alloc_queue(gfp_t); | |
879 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
880 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
881 | |
882 | /* | |
883 | * tag stuff | |
884 | */ | |
4aff5e23 | 885 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
886 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
887 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
888 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
889 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
890 | extern void blk_queue_free_tags(struct request_queue *); | |
891 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
892 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
893 | extern struct blk_queue_tag *blk_init_tags(int); |
894 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 895 | |
f583f492 DS |
896 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
897 | int tag) | |
898 | { | |
899 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
900 | return NULL; | |
901 | return bqt->tag_index[tag]; | |
902 | } | |
903 | ||
1da177e4 | 904 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
3e6053d7 HD |
905 | extern int blkdev_issue_discard(struct block_device *, |
906 | sector_t sector, sector_t nr_sects, gfp_t); | |
fb2dce86 DW |
907 | |
908 | static inline int sb_issue_discard(struct super_block *sb, | |
3e6053d7 | 909 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
910 | { |
911 | block <<= (sb->s_blocksize_bits - 9); | |
912 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
3e6053d7 | 913 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
fb2dce86 | 914 | } |
1da177e4 | 915 | |
0b07de85 AG |
916 | /* |
917 | * command filter functions | |
918 | */ | |
4beab5c6 | 919 | extern int blk_verify_command(struct blk_cmd_filter *filter, |
aeb5d727 AV |
920 | unsigned char *cmd, fmode_t has_write_perm); |
921 | extern void blk_unregister_filter(struct gendisk *disk); | |
4beab5c6 | 922 | extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
0b07de85 | 923 | |
1da177e4 LT |
924 | #define MAX_PHYS_SEGMENTS 128 |
925 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
926 | #define SAFE_MAX_SECTORS 255 |
927 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
928 | |
929 | #define MAX_SEGMENT_SIZE 65536 | |
930 | ||
0e435ac2 MB |
931 | #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL |
932 | ||
1da177e4 LT |
933 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
934 | ||
165125e1 | 935 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
936 | { |
937 | int retval = 512; | |
938 | ||
939 | if (q && q->hardsect_size) | |
940 | retval = q->hardsect_size; | |
941 | ||
942 | return retval; | |
943 | } | |
944 | ||
945 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
946 | { | |
947 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
948 | } | |
949 | ||
165125e1 | 950 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 951 | { |
482eb689 | 952 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
953 | } |
954 | ||
87904074 FT |
955 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
956 | unsigned int len) | |
957 | { | |
958 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
959 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
960 | } | |
961 | ||
1da177e4 LT |
962 | /* assumes size > 256 */ |
963 | static inline unsigned int blksize_bits(unsigned int size) | |
964 | { | |
965 | unsigned int bits = 8; | |
966 | do { | |
967 | bits++; | |
968 | size >>= 1; | |
969 | } while (size > 256); | |
970 | return bits; | |
971 | } | |
972 | ||
2befb9e3 | 973 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
974 | { |
975 | return bdev->bd_block_size; | |
976 | } | |
977 | ||
978 | typedef struct {struct page *v;} Sector; | |
979 | ||
980 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
981 | ||
982 | static inline void put_dev_sector(Sector p) | |
983 | { | |
984 | page_cache_release(p.v); | |
985 | } | |
986 | ||
987 | struct work_struct; | |
18887ad9 | 988 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 989 | |
1da177e4 LT |
990 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
991 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
992 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
993 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
994 | ||
7ba1ba12 MP |
995 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
996 | ||
b24498d4 JA |
997 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
998 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
999 | |
1000 | struct blk_integrity_exchg { | |
1001 | void *prot_buf; | |
1002 | void *data_buf; | |
1003 | sector_t sector; | |
1004 | unsigned int data_size; | |
1005 | unsigned short sector_size; | |
1006 | const char *disk_name; | |
1007 | }; | |
1008 | ||
1009 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1010 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1011 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1012 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1013 | ||
1014 | struct blk_integrity { | |
1015 | integrity_gen_fn *generate_fn; | |
1016 | integrity_vrfy_fn *verify_fn; | |
1017 | integrity_set_tag_fn *set_tag_fn; | |
1018 | integrity_get_tag_fn *get_tag_fn; | |
1019 | ||
1020 | unsigned short flags; | |
1021 | unsigned short tuple_size; | |
1022 | unsigned short sector_size; | |
1023 | unsigned short tag_size; | |
1024 | ||
1025 | const char *name; | |
1026 | ||
1027 | struct kobject kobj; | |
1028 | }; | |
1029 | ||
1030 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1031 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1032 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1033 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1034 | extern int blk_rq_count_integrity_sg(struct request *); | |
1035 | ||
b04accc4 JA |
1036 | static inline |
1037 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1038 | { | |
1039 | return bdev->bd_disk->integrity; | |
1040 | } | |
1041 | ||
b02739b0 MP |
1042 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1043 | { | |
1044 | return disk->integrity; | |
1045 | } | |
1046 | ||
7ba1ba12 MP |
1047 | static inline int blk_integrity_rq(struct request *rq) |
1048 | { | |
d442cc44 MP |
1049 | if (rq->bio == NULL) |
1050 | return 0; | |
1051 | ||
7ba1ba12 MP |
1052 | return bio_integrity(rq->bio); |
1053 | } | |
1054 | ||
1055 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1056 | ||
1057 | #define blk_integrity_rq(rq) (0) | |
1058 | #define blk_rq_count_integrity_sg(a) (0) | |
1059 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1060 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1061 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1062 | #define blk_integrity_compare(a, b) (0) |
1063 | #define blk_integrity_register(a, b) (0) | |
1064 | #define blk_integrity_unregister(a) do { } while (0); | |
1065 | ||
1066 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1067 | ||
08f85851 | 1068 | struct block_device_operations { |
d4430d62 AV |
1069 | int (*open) (struct block_device *, fmode_t); |
1070 | int (*release) (struct gendisk *, fmode_t); | |
1071 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1072 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1073 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1074 | int (*direct_access) (struct block_device *, sector_t, |
1075 | void **, unsigned long *); | |
1076 | int (*media_changed) (struct gendisk *); | |
1077 | int (*revalidate_disk) (struct gendisk *); | |
1078 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
1079 | struct module *owner; | |
1080 | }; | |
1081 | ||
633a08b8 AV |
1082 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1083 | unsigned long); | |
9361401e DH |
1084 | #else /* CONFIG_BLOCK */ |
1085 | /* | |
1086 | * stubs for when the block layer is configured out | |
1087 | */ | |
1088 | #define buffer_heads_over_limit 0 | |
1089 | ||
9361401e DH |
1090 | static inline long nr_blockdev_pages(void) |
1091 | { | |
1092 | return 0; | |
1093 | } | |
1094 | ||
9361401e DH |
1095 | #endif /* CONFIG_BLOCK */ |
1096 | ||
1da177e4 | 1097 | #endif |