Commit | Line | Data |
---|---|---|
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 { | |
1faa16d2 JA |
41 | /* |
42 | * count[], starved[], and wait[] are indexed by | |
43 | * BLK_RW_SYNC/BLK_RW_ASYNC | |
44 | */ | |
1da177e4 LT |
45 | int count[2]; |
46 | int starved[2]; | |
cb98fc8b | 47 | int elvpriv; |
1da177e4 LT |
48 | mempool_t *rq_pool; |
49 | wait_queue_head_t wait[2]; | |
1da177e4 LT |
50 | }; |
51 | ||
4aff5e23 JA |
52 | /* |
53 | * request command types | |
54 | */ | |
55 | enum rq_cmd_type_bits { | |
56 | REQ_TYPE_FS = 1, /* fs request */ | |
57 | REQ_TYPE_BLOCK_PC, /* scsi command */ | |
58 | REQ_TYPE_SENSE, /* sense request */ | |
59 | REQ_TYPE_PM_SUSPEND, /* suspend request */ | |
60 | REQ_TYPE_PM_RESUME, /* resume request */ | |
61 | REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ | |
4aff5e23 JA |
62 | REQ_TYPE_SPECIAL, /* driver defined type */ |
63 | REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ | |
64 | /* | |
65 | * for ATA/ATAPI devices. this really doesn't belong here, ide should | |
66 | * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver | |
67 | * private REQ_LB opcodes to differentiate what type of request this is | |
68 | */ | |
4aff5e23 | 69 | REQ_TYPE_ATA_TASKFILE, |
cea2885a | 70 | REQ_TYPE_ATA_PC, |
4aff5e23 JA |
71 | }; |
72 | ||
73 | /* | |
74 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
75 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
76 | * SCSI cdb. | |
77 | * | |
78 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
79 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
80 | * | |
81 | */ | |
82 | enum { | |
4aff5e23 | 83 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
1a8e2bdd | 84 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
4aff5e23 JA |
85 | }; |
86 | ||
87 | /* | |
1f98a13f | 88 | * request type modified bits. first four bits match BIO_RW* bits, important |
4aff5e23 JA |
89 | */ |
90 | enum rq_flag_bits { | |
91 | __REQ_RW, /* not set, read. set, write */ | |
6000a368 MC |
92 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ |
93 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
94 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
a82afdfc | 95 | /* above flags must match BIO_RW_* */ |
fb2dce86 | 96 | __REQ_DISCARD, /* request to discard sectors */ |
4aff5e23 JA |
97 | __REQ_SORTED, /* elevator knows about this request */ |
98 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
99 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
100 | __REQ_FUA, /* forced unit access */ | |
101 | __REQ_NOMERGE, /* don't touch this for merging */ | |
102 | __REQ_STARTED, /* drive already may have started this one */ | |
103 | __REQ_DONTPREP, /* don't call prep for this one */ | |
104 | __REQ_QUEUED, /* uses queueing */ | |
105 | __REQ_ELVPRIV, /* elevator private data attached */ | |
106 | __REQ_FAILED, /* set if the request failed */ | |
107 | __REQ_QUIET, /* don't worry about errors */ | |
108 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
109 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
1faa16d2 | 110 | __REQ_RW_SYNC, /* request is sync (sync write or read) */ |
49171e5c | 111 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 112 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 113 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 114 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
aeb6fafb | 115 | __REQ_NOIDLE, /* Don't anticipate more IO after this one */ |
42dad764 | 116 | __REQ_IO_STAT, /* account I/O stat */ |
80a761fd | 117 | __REQ_MIXED_MERGE, /* merge of different types, fail separately */ |
4aff5e23 JA |
118 | __REQ_NR_BITS, /* stops here */ |
119 | }; | |
120 | ||
121 | #define REQ_RW (1 << __REQ_RW) | |
6000a368 MC |
122 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
123 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) | |
124 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) | |
fb2dce86 | 125 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
4aff5e23 JA |
126 | #define REQ_SORTED (1 << __REQ_SORTED) |
127 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
128 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
129 | #define REQ_FUA (1 << __REQ_FUA) | |
130 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
131 | #define REQ_STARTED (1 << __REQ_STARTED) | |
132 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
133 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
134 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
135 | #define REQ_FAILED (1 << __REQ_FAILED) | |
136 | #define REQ_QUIET (1 << __REQ_QUIET) | |
137 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
138 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
139 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 140 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 141 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 142 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 143 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
aeb6fafb | 144 | #define REQ_NOIDLE (1 << __REQ_NOIDLE) |
42dad764 | 145 | #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
80a761fd | 146 | #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) |
4aff5e23 | 147 | |
a82afdfc TH |
148 | #define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \ |
149 | REQ_FAILFAST_DRIVER) | |
150 | ||
1da177e4 LT |
151 | #define BLK_MAX_CDB 16 |
152 | ||
153 | /* | |
63a71386 JA |
154 | * try to put the fields that are referenced together in the same cacheline. |
155 | * if you modify this structure, be sure to check block/blk-core.c:rq_init() | |
156 | * as well! | |
1da177e4 LT |
157 | */ |
158 | struct request { | |
ff856bad | 159 | struct list_head queuelist; |
c7c22e4d | 160 | struct call_single_data csd; |
ff856bad | 161 | |
165125e1 | 162 | struct request_queue *q; |
e6a1c874 | 163 | |
4aff5e23 JA |
164 | unsigned int cmd_flags; |
165 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 166 | unsigned long atomic_flags; |
1da177e4 | 167 | |
181fdde3 RK |
168 | int cpu; |
169 | ||
a2dec7b3 | 170 | /* the following two fields are internal, NEVER access directly */ |
a2dec7b3 | 171 | unsigned int __data_len; /* total data len */ |
181fdde3 | 172 | sector_t __sector; /* sector cursor */ |
1da177e4 LT |
173 | |
174 | struct bio *bio; | |
175 | struct bio *biotail; | |
176 | ||
9817064b | 177 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
178 | /* |
179 | * The rb_node is only used inside the io scheduler, requests | |
180 | * are pruned when moved to the dispatch queue. So let the | |
181 | * completion_data share space with the rb_node. | |
182 | */ | |
183 | union { | |
184 | struct rb_node rb_node; /* sort/lookup */ | |
185 | void *completion_data; | |
186 | }; | |
9817064b | 187 | |
ff7d145f | 188 | /* |
7f1dc8a2 | 189 | * Three pointers are available for the IO schedulers, if they need |
ff7d145f JA |
190 | * more they have to dynamically allocate it. |
191 | */ | |
1da177e4 | 192 | void *elevator_private; |
ff7d145f | 193 | void *elevator_private2; |
7f1dc8a2 | 194 | void *elevator_private3; |
ff7d145f | 195 | |
8f34ee75 | 196 | struct gendisk *rq_disk; |
1da177e4 | 197 | unsigned long start_time; |
9195291e DS |
198 | #ifdef CONFIG_BLK_CGROUP |
199 | unsigned long long start_time_ns; | |
200 | unsigned long long io_start_time_ns; /* when passed to hardware */ | |
201 | #endif | |
1da177e4 LT |
202 | /* Number of scatter-gather DMA addr+len pairs after |
203 | * physical address coalescing is performed. | |
204 | */ | |
205 | unsigned short nr_phys_segments; | |
206 | ||
8f34ee75 JA |
207 | unsigned short ioprio; |
208 | ||
181fdde3 RK |
209 | int ref_count; |
210 | ||
731ec497 TH |
211 | void *special; /* opaque pointer available for LLD use */ |
212 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 213 | |
cdd60262 JA |
214 | int tag; |
215 | int errors; | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * when request is used as a packet command carrier | |
219 | */ | |
d7e3c324 FT |
220 | unsigned char __cmd[BLK_MAX_CDB]; |
221 | unsigned char *cmd; | |
181fdde3 | 222 | unsigned short cmd_len; |
1da177e4 | 223 | |
7a85f889 | 224 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 225 | unsigned int sense_len; |
c3a4d78c | 226 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
227 | void *sense; |
228 | ||
242f9dcb JA |
229 | unsigned long deadline; |
230 | struct list_head timeout_list; | |
1da177e4 | 231 | unsigned int timeout; |
17e01f21 | 232 | int retries; |
1da177e4 | 233 | |
1da177e4 | 234 | /* |
c00895ab | 235 | * completion callback. |
1da177e4 LT |
236 | */ |
237 | rq_end_io_fn *end_io; | |
238 | void *end_io_data; | |
abae1fde FT |
239 | |
240 | /* for bidi */ | |
241 | struct request *next_rq; | |
1da177e4 LT |
242 | }; |
243 | ||
766ca442 FLVC |
244 | static inline unsigned short req_get_ioprio(struct request *req) |
245 | { | |
246 | return req->ioprio; | |
247 | } | |
248 | ||
1da177e4 | 249 | /* |
4aff5e23 | 250 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
251 | * requests. Some step values could eventually be made generic. |
252 | */ | |
253 | struct request_pm_state | |
254 | { | |
255 | /* PM state machine step value, currently driver specific */ | |
256 | int pm_step; | |
257 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
258 | u32 pm_state; | |
259 | void* data; /* for driver use */ | |
260 | }; | |
261 | ||
262 | #include <linux/elevator.h> | |
263 | ||
165125e1 JA |
264 | typedef void (request_fn_proc) (struct request_queue *q); |
265 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
266 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
267 | typedef void (unplug_fn) (struct request_queue *); | |
1da177e4 LT |
268 | |
269 | struct bio_vec; | |
cc371e66 AK |
270 | struct bvec_merge_data { |
271 | struct block_device *bi_bdev; | |
272 | sector_t bi_sector; | |
273 | unsigned bi_size; | |
274 | unsigned long bi_rw; | |
275 | }; | |
276 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
277 | struct bio_vec *); | |
165125e1 | 278 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 279 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 280 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 281 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 282 | |
242f9dcb JA |
283 | enum blk_eh_timer_return { |
284 | BLK_EH_NOT_HANDLED, | |
285 | BLK_EH_HANDLED, | |
286 | BLK_EH_RESET_TIMER, | |
287 | }; | |
288 | ||
289 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
290 | ||
1da177e4 LT |
291 | enum blk_queue_state { |
292 | Queue_down, | |
293 | Queue_up, | |
294 | }; | |
295 | ||
1da177e4 LT |
296 | struct blk_queue_tag { |
297 | struct request **tag_index; /* map of busy tags */ | |
298 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
299 | int busy; /* current depth */ |
300 | int max_depth; /* what we will send to device */ | |
ba025082 | 301 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
302 | atomic_t refcnt; /* map can be shared */ |
303 | }; | |
304 | ||
abf54393 FT |
305 | #define BLK_SCSI_MAX_CMDS (256) |
306 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
307 | ||
025146e1 MP |
308 | struct queue_limits { |
309 | unsigned long bounce_pfn; | |
310 | unsigned long seg_boundary_mask; | |
311 | ||
312 | unsigned int max_hw_sectors; | |
313 | unsigned int max_sectors; | |
314 | unsigned int max_segment_size; | |
c72758f3 MP |
315 | unsigned int physical_block_size; |
316 | unsigned int alignment_offset; | |
317 | unsigned int io_min; | |
318 | unsigned int io_opt; | |
67efc925 | 319 | unsigned int max_discard_sectors; |
86b37281 MP |
320 | unsigned int discard_granularity; |
321 | unsigned int discard_alignment; | |
025146e1 MP |
322 | |
323 | unsigned short logical_block_size; | |
8a78362c | 324 | unsigned short max_segments; |
025146e1 | 325 | |
c72758f3 | 326 | unsigned char misaligned; |
86b37281 | 327 | unsigned char discard_misaligned; |
025146e1 | 328 | unsigned char no_cluster; |
98262f27 | 329 | signed char discard_zeroes_data; |
025146e1 MP |
330 | }; |
331 | ||
1da177e4 LT |
332 | struct request_queue |
333 | { | |
334 | /* | |
335 | * Together with queue_head for cacheline sharing | |
336 | */ | |
337 | struct list_head queue_head; | |
338 | struct request *last_merge; | |
b374d18a | 339 | struct elevator_queue *elevator; |
1da177e4 LT |
340 | |
341 | /* | |
342 | * the queue request freelist, one for reads and one for writes | |
343 | */ | |
344 | struct request_list rq; | |
345 | ||
346 | request_fn_proc *request_fn; | |
1da177e4 LT |
347 | make_request_fn *make_request_fn; |
348 | prep_rq_fn *prep_rq_fn; | |
349 | unplug_fn *unplug_fn; | |
350 | merge_bvec_fn *merge_bvec_fn; | |
1da177e4 | 351 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 352 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 353 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 354 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 355 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 356 | |
8922e16c TH |
357 | /* |
358 | * Dispatch queue sorting | |
359 | */ | |
1b47f531 | 360 | sector_t end_sector; |
8922e16c | 361 | struct request *boundary_rq; |
8922e16c | 362 | |
1da177e4 LT |
363 | /* |
364 | * Auto-unplugging state | |
365 | */ | |
366 | struct timer_list unplug_timer; | |
367 | int unplug_thresh; /* After this many requests */ | |
368 | unsigned long unplug_delay; /* After this many jiffies */ | |
369 | struct work_struct unplug_work; | |
370 | ||
371 | struct backing_dev_info backing_dev_info; | |
372 | ||
373 | /* | |
374 | * The queue owner gets to use this for whatever they like. | |
375 | * ll_rw_blk doesn't touch it. | |
376 | */ | |
377 | void *queuedata; | |
378 | ||
1da177e4 LT |
379 | /* |
380 | * queue needs bounce pages for pages above this limit | |
381 | */ | |
8267e268 | 382 | gfp_t bounce_gfp; |
1da177e4 LT |
383 | |
384 | /* | |
385 | * various queue flags, see QUEUE_* below | |
386 | */ | |
387 | unsigned long queue_flags; | |
388 | ||
389 | /* | |
152587de | 390 | * protects queue structures from reentrancy. ->__queue_lock should |
391 | * _never_ be used directly, it is queue private. always use | |
392 | * ->queue_lock. | |
1da177e4 | 393 | */ |
152587de | 394 | spinlock_t __queue_lock; |
1da177e4 LT |
395 | spinlock_t *queue_lock; |
396 | ||
397 | /* | |
398 | * queue kobject | |
399 | */ | |
400 | struct kobject kobj; | |
401 | ||
402 | /* | |
403 | * queue settings | |
404 | */ | |
405 | unsigned long nr_requests; /* Max # of requests */ | |
406 | unsigned int nr_congestion_on; | |
407 | unsigned int nr_congestion_off; | |
408 | unsigned int nr_batching; | |
409 | ||
fa0ccd83 JB |
410 | void *dma_drain_buffer; |
411 | unsigned int dma_drain_size; | |
e3790c7d | 412 | unsigned int dma_pad_mask; |
1da177e4 LT |
413 | unsigned int dma_alignment; |
414 | ||
415 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 416 | struct list_head tag_busy_list; |
1da177e4 | 417 | |
15853af9 | 418 | unsigned int nr_sorted; |
0a7ae2ff | 419 | unsigned int in_flight[2]; |
1da177e4 | 420 | |
242f9dcb JA |
421 | unsigned int rq_timeout; |
422 | struct timer_list timeout; | |
423 | struct list_head timeout_list; | |
424 | ||
025146e1 MP |
425 | struct queue_limits limits; |
426 | ||
1da177e4 LT |
427 | /* |
428 | * sg stuff | |
429 | */ | |
430 | unsigned int sg_timeout; | |
431 | unsigned int sg_reserved_size; | |
1946089a | 432 | int node; |
6c5c9341 | 433 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 434 | struct blk_trace *blk_trace; |
6c5c9341 | 435 | #endif |
1da177e4 LT |
436 | /* |
437 | * reserved for flush operations | |
438 | */ | |
797e7dbb TH |
439 | unsigned int ordered, next_ordered, ordseq; |
440 | int orderr, ordcolor; | |
441 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
442 | struct request *orig_bar_rq; | |
483f4afc AV |
443 | |
444 | struct mutex sysfs_lock; | |
d351af01 FT |
445 | |
446 | #if defined(CONFIG_BLK_DEV_BSG) | |
447 | struct bsg_class_device bsg_dev; | |
448 | #endif | |
1da177e4 LT |
449 | }; |
450 | ||
1da177e4 LT |
451 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
452 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
453 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
454 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
455 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
456 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
457 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
458 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 459 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 460 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 461 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 462 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 463 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 464 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 465 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 466 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 | 467 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
79da0644 | 468 | #define QUEUE_FLAG_DISCARD 16 /* supports DISCARD */ |
7f03292e | 469 | #define QUEUE_FLAG_NOXMERGES 17 /* No extended merges */ |
e2e1a148 | 470 | #define QUEUE_FLAG_ADD_RANDOM 18 /* Contributes to random pool */ |
bc58ba94 JA |
471 | |
472 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
473 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
01e97f6b | 474 | (1 << QUEUE_FLAG_STACKABLE) | \ |
e2e1a148 JA |
475 | (1 << QUEUE_FLAG_SAME_COMP) | \ |
476 | (1 << QUEUE_FLAG_ADD_RANDOM)) | |
797e7dbb | 477 | |
8f45c1a5 LT |
478 | static inline int queue_is_locked(struct request_queue *q) |
479 | { | |
7663c1e2 | 480 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
481 | spinlock_t *lock = q->queue_lock; |
482 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
483 | #else |
484 | return 1; | |
485 | #endif | |
8f45c1a5 LT |
486 | } |
487 | ||
75ad23bc NP |
488 | static inline void queue_flag_set_unlocked(unsigned int flag, |
489 | struct request_queue *q) | |
490 | { | |
491 | __set_bit(flag, &q->queue_flags); | |
492 | } | |
493 | ||
e48ec690 JA |
494 | static inline int queue_flag_test_and_clear(unsigned int flag, |
495 | struct request_queue *q) | |
496 | { | |
497 | WARN_ON_ONCE(!queue_is_locked(q)); | |
498 | ||
499 | if (test_bit(flag, &q->queue_flags)) { | |
500 | __clear_bit(flag, &q->queue_flags); | |
501 | return 1; | |
502 | } | |
503 | ||
504 | return 0; | |
505 | } | |
506 | ||
507 | static inline int queue_flag_test_and_set(unsigned int flag, | |
508 | struct request_queue *q) | |
509 | { | |
510 | WARN_ON_ONCE(!queue_is_locked(q)); | |
511 | ||
512 | if (!test_bit(flag, &q->queue_flags)) { | |
513 | __set_bit(flag, &q->queue_flags); | |
514 | return 0; | |
515 | } | |
516 | ||
517 | return 1; | |
518 | } | |
519 | ||
75ad23bc NP |
520 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
521 | { | |
8f45c1a5 | 522 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
523 | __set_bit(flag, &q->queue_flags); |
524 | } | |
525 | ||
526 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
527 | struct request_queue *q) | |
528 | { | |
529 | __clear_bit(flag, &q->queue_flags); | |
530 | } | |
531 | ||
0a7ae2ff JA |
532 | static inline int queue_in_flight(struct request_queue *q) |
533 | { | |
534 | return q->in_flight[0] + q->in_flight[1]; | |
535 | } | |
536 | ||
75ad23bc NP |
537 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
538 | { | |
8f45c1a5 | 539 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
540 | __clear_bit(flag, &q->queue_flags); |
541 | } | |
542 | ||
797e7dbb TH |
543 | enum { |
544 | /* | |
545 | * Hardbarrier is supported with one of the following methods. | |
546 | * | |
547 | * NONE : hardbarrier unsupported | |
548 | * DRAIN : ordering by draining is enough | |
549 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
550 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
551 | * TAG : ordering by tag is enough | |
552 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
553 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
554 | */ | |
313e4299 TH |
555 | QUEUE_ORDERED_BY_DRAIN = 0x01, |
556 | QUEUE_ORDERED_BY_TAG = 0x02, | |
557 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, | |
f671620e | 558 | QUEUE_ORDERED_DO_BAR = 0x20, |
313e4299 TH |
559 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
560 | QUEUE_ORDERED_DO_FUA = 0x80, | |
561 | ||
562 | QUEUE_ORDERED_NONE = 0x00, | |
563 | ||
f671620e TH |
564 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
565 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
566 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
567 | QUEUE_ORDERED_DO_PREFLUSH | | |
568 | QUEUE_ORDERED_DO_POSTFLUSH, | |
569 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
570 | QUEUE_ORDERED_DO_PREFLUSH | | |
571 | QUEUE_ORDERED_DO_FUA, | |
572 | ||
f671620e TH |
573 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
574 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
575 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
576 | QUEUE_ORDERED_DO_PREFLUSH | | |
577 | QUEUE_ORDERED_DO_POSTFLUSH, | |
578 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
579 | QUEUE_ORDERED_DO_PREFLUSH | | |
580 | QUEUE_ORDERED_DO_FUA, | |
797e7dbb TH |
581 | |
582 | /* | |
583 | * Ordered operation sequence | |
584 | */ | |
585 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
586 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
587 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
588 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
589 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
590 | QUEUE_ORDSEQ_DONE = 0x20, | |
591 | }; | |
1da177e4 LT |
592 | |
593 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
594 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
595 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 596 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
488991e2 AB |
597 | #define blk_queue_noxmerges(q) \ |
598 | test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) | |
a68bbddb | 599 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 600 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
e2e1a148 | 601 | #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) |
797e7dbb | 602 | #define blk_queue_flushing(q) ((q)->ordseq) |
4ee5eaf4 KU |
603 | #define blk_queue_stackable(q) \ |
604 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
c15227de | 605 | #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) |
1da177e4 | 606 | |
33659ebb CH |
607 | #define blk_noretry_request(rq) \ |
608 | ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ | |
609 | REQ_FAILFAST_DRIVER)) | |
610 | ||
611 | #define blk_account_rq(rq) \ | |
612 | (((rq)->cmd_flags & REQ_STARTED) && \ | |
613 | ((rq)->cmd_type == REQ_TYPE_FS || \ | |
614 | ((rq)->cmd_flags & REQ_DISCARD))) | |
615 | ||
1da177e4 | 616 | #define blk_pm_request(rq) \ |
33659ebb CH |
617 | ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
618 | (rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 619 | |
ab780f1e | 620 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
abae1fde | 621 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
622 | /* rq->queuelist of dequeued request must be list_empty() */ |
623 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
624 | |
625 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
626 | ||
4aff5e23 | 627 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 628 | |
9e2585a8 | 629 | /* |
1faa16d2 | 630 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 631 | */ |
1faa16d2 JA |
632 | static inline bool rw_is_sync(unsigned int rw_flags) |
633 | { | |
634 | return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); | |
635 | } | |
636 | ||
637 | static inline bool rq_is_sync(struct request *rq) | |
638 | { | |
639 | return rw_is_sync(rq->cmd_flags); | |
640 | } | |
641 | ||
1faa16d2 | 642 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 643 | { |
1faa16d2 JA |
644 | if (sync) |
645 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
646 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
647 | } |
648 | ||
1faa16d2 | 649 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 650 | { |
1faa16d2 JA |
651 | if (sync) |
652 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 653 | else |
1faa16d2 | 654 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
655 | } |
656 | ||
1faa16d2 | 657 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 658 | { |
1faa16d2 JA |
659 | if (sync) |
660 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 661 | else |
1faa16d2 | 662 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
663 | } |
664 | ||
665 | ||
666 | /* | |
667 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
668 | * it already be started by driver. | |
669 | */ | |
670 | #define RQ_NOMERGE_FLAGS \ | |
671 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
672 | #define rq_mergeable(rq) \ | |
e17fc0a1 | 673 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
33659ebb CH |
674 | (((rq)->cmd_flags & REQ_DISCARD) || \ |
675 | (rq)->cmd_type == REQ_TYPE_FS)) | |
1da177e4 | 676 | |
1da177e4 LT |
677 | /* |
678 | * q->prep_rq_fn return values | |
679 | */ | |
680 | #define BLKPREP_OK 0 /* serve it */ | |
681 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
682 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
683 | ||
684 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
685 | ||
686 | /* | |
687 | * standard bounce addresses: | |
688 | * | |
689 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
690 | * BLK_BOUNCE_ANY : don't bounce anything | |
691 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
692 | */ | |
2472892a AK |
693 | |
694 | #if BITS_PER_LONG == 32 | |
1da177e4 | 695 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
696 | #else |
697 | #define BLK_BOUNCE_HIGH -1ULL | |
698 | #endif | |
699 | #define BLK_BOUNCE_ANY (-1ULL) | |
bfe17231 | 700 | #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) |
1da177e4 | 701 | |
3d6392cf JA |
702 | /* |
703 | * default timeout for SG_IO if none specified | |
704 | */ | |
705 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 706 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 707 | |
2a7326b5 | 708 | #ifdef CONFIG_BOUNCE |
1da177e4 | 709 | extern int init_emergency_isa_pool(void); |
165125e1 | 710 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
711 | #else |
712 | static inline int init_emergency_isa_pool(void) | |
713 | { | |
714 | return 0; | |
715 | } | |
165125e1 | 716 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
717 | { |
718 | } | |
719 | #endif /* CONFIG_MMU */ | |
720 | ||
152e283f FT |
721 | struct rq_map_data { |
722 | struct page **pages; | |
723 | int page_order; | |
724 | int nr_entries; | |
56c451f4 | 725 | unsigned long offset; |
97ae77a1 | 726 | int null_mapped; |
ecb554a8 | 727 | int from_user; |
152e283f FT |
728 | }; |
729 | ||
5705f702 N |
730 | struct req_iterator { |
731 | int i; | |
732 | struct bio *bio; | |
733 | }; | |
734 | ||
735 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
736 | #define for_each_bio(_bio) \ |
737 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 738 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
739 | if ((rq->bio)) \ |
740 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
741 | ||
5705f702 N |
742 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
743 | __rq_for_each_bio(_iter.bio, _rq) \ | |
744 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
745 | ||
746 | #define rq_iter_last(rq, _iter) \ | |
747 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
748 | ||
2d4dc890 IL |
749 | #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE |
750 | # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" | |
751 | #endif | |
752 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE | |
753 | extern void rq_flush_dcache_pages(struct request *rq); | |
754 | #else | |
755 | static inline void rq_flush_dcache_pages(struct request *rq) | |
756 | { | |
757 | } | |
758 | #endif | |
759 | ||
1da177e4 LT |
760 | extern int blk_register_queue(struct gendisk *disk); |
761 | extern void blk_unregister_queue(struct gendisk *disk); | |
762 | extern void register_disk(struct gendisk *dev); | |
763 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 764 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 765 | extern void blk_put_request(struct request *); |
165125e1 | 766 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 767 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
768 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
769 | gfp_t); | |
165125e1 JA |
770 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
771 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 | 772 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 773 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
774 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
775 | struct bio_set *bs, gfp_t gfp_mask, | |
776 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
777 | void *data); | |
778 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
779 | extern int blk_insert_cloned_request(struct request_queue *q, |
780 | struct request *rq); | |
165125e1 | 781 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 782 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
783 | extern int blk_remove_plug(struct request_queue *); |
784 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
785 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
786 | unsigned int, void __user *); | |
e915e872 AV |
787 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
788 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
789 | |
790 | /* | |
791 | * A queue has just exitted congestion. Note this in the global counter of | |
792 | * congested queues, and wake up anyone who was waiting for requests to be | |
793 | * put back. | |
794 | */ | |
8aa7e847 | 795 | static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 796 | { |
8aa7e847 | 797 | clear_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
798 | } |
799 | ||
800 | /* | |
801 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
802 | * state flags and increment the global gounter of congested queues. | |
803 | */ | |
8aa7e847 | 804 | static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
3fcfab16 | 805 | { |
8aa7e847 | 806 | set_bdi_congested(&q->backing_dev_info, sync); |
3fcfab16 AM |
807 | } |
808 | ||
165125e1 JA |
809 | extern void blk_start_queue(struct request_queue *q); |
810 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 811 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 812 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 813 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 814 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 815 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
816 | struct rq_map_data *, void __user *, unsigned long, |
817 | gfp_t); | |
8e5cfc45 | 818 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
819 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
820 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
821 | struct rq_map_data *, struct sg_iovec *, int, |
822 | unsigned int, gfp_t); | |
165125e1 | 823 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 824 | struct request *, int); |
165125e1 | 825 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 826 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 827 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 828 | |
165125e1 | 829 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
830 | { |
831 | return bdev->bd_disk->queue; | |
832 | } | |
833 | ||
5efccd17 | 834 | /* |
80a761fd TH |
835 | * blk_rq_pos() : the current sector |
836 | * blk_rq_bytes() : bytes left in the entire request | |
837 | * blk_rq_cur_bytes() : bytes left in the current segment | |
838 | * blk_rq_err_bytes() : bytes left till the next error boundary | |
839 | * blk_rq_sectors() : sectors left in the entire request | |
840 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 841 | */ |
5b93629b TH |
842 | static inline sector_t blk_rq_pos(const struct request *rq) |
843 | { | |
a2dec7b3 | 844 | return rq->__sector; |
2e46e8b2 TH |
845 | } |
846 | ||
847 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
848 | { | |
a2dec7b3 | 849 | return rq->__data_len; |
5b93629b TH |
850 | } |
851 | ||
2e46e8b2 TH |
852 | static inline int blk_rq_cur_bytes(const struct request *rq) |
853 | { | |
854 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
855 | } | |
5efccd17 | 856 | |
80a761fd TH |
857 | extern unsigned int blk_rq_err_bytes(const struct request *rq); |
858 | ||
5b93629b TH |
859 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
860 | { | |
2e46e8b2 | 861 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
862 | } |
863 | ||
864 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
865 | { | |
2e46e8b2 | 866 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
867 | } |
868 | ||
9934c8c0 TH |
869 | /* |
870 | * Request issue related functions. | |
871 | */ | |
872 | extern struct request *blk_peek_request(struct request_queue *q); | |
873 | extern void blk_start_request(struct request *rq); | |
874 | extern struct request *blk_fetch_request(struct request_queue *q); | |
875 | ||
1da177e4 | 876 | /* |
2e60e022 TH |
877 | * Request completion related functions. |
878 | * | |
879 | * blk_update_request() completes given number of bytes and updates | |
880 | * the request without completing it. | |
881 | * | |
f06d9a2b TH |
882 | * blk_end_request() and friends. __blk_end_request() must be called |
883 | * with the request queue spinlock acquired. | |
1da177e4 LT |
884 | * |
885 | * Several drivers define their own end_request and call | |
3bcddeac KU |
886 | * blk_end_request() for parts of the original function. |
887 | * This prevents code duplication in drivers. | |
1da177e4 | 888 | */ |
2e60e022 TH |
889 | extern bool blk_update_request(struct request *rq, int error, |
890 | unsigned int nr_bytes); | |
b1f74493 FT |
891 | extern bool blk_end_request(struct request *rq, int error, |
892 | unsigned int nr_bytes); | |
893 | extern void blk_end_request_all(struct request *rq, int error); | |
894 | extern bool blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 895 | extern bool blk_end_request_err(struct request *rq, int error); |
b1f74493 FT |
896 | extern bool __blk_end_request(struct request *rq, int error, |
897 | unsigned int nr_bytes); | |
898 | extern void __blk_end_request_all(struct request *rq, int error); | |
899 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
80a761fd | 900 | extern bool __blk_end_request_err(struct request *rq, int error); |
2e60e022 | 901 | |
ff856bad | 902 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
903 | extern void __blk_complete_request(struct request *); |
904 | extern void blk_abort_request(struct request *); | |
11914a53 | 905 | extern void blk_abort_queue(struct request_queue *); |
ff856bad | 906 | |
1da177e4 LT |
907 | /* |
908 | * Access functions for manipulating queue properties | |
909 | */ | |
165125e1 | 910 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 911 | spinlock_t *lock, int node_id); |
01effb0d MS |
912 | extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, |
913 | request_fn_proc *, | |
914 | spinlock_t *, int node_id); | |
165125e1 | 915 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
01effb0d MS |
916 | extern struct request_queue *blk_init_allocated_queue(struct request_queue *, |
917 | request_fn_proc *, spinlock_t *); | |
165125e1 JA |
918 | extern void blk_cleanup_queue(struct request_queue *); |
919 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
920 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
086fa5ff | 921 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
8a78362c | 922 | extern void blk_queue_max_segments(struct request_queue *, unsigned short); |
165125e1 | 923 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
67efc925 CH |
924 | extern void blk_queue_max_discard_sectors(struct request_queue *q, |
925 | unsigned int max_discard_sectors); | |
e1defc4f | 926 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
c72758f3 MP |
927 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
928 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
929 | unsigned int alignment); | |
7c958e32 | 930 | extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); |
c72758f3 | 931 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); |
3c5820c7 | 932 | extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); |
c72758f3 | 933 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); |
e475bba2 | 934 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
935 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
936 | sector_t offset); | |
17be8c24 MP |
937 | extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, |
938 | sector_t offset); | |
c72758f3 MP |
939 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, |
940 | sector_t offset); | |
165125e1 | 941 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 942 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 943 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
944 | extern int blk_queue_dma_drain(struct request_queue *q, |
945 | dma_drain_needed_fn *dma_drain_needed, | |
946 | void *buf, unsigned int size); | |
ef9e3fac | 947 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
948 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
949 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
950 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
951 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 952 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 953 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
242f9dcb JA |
954 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
955 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 956 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 957 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
8f11b3e9 | 958 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 959 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 960 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 961 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 962 | |
165125e1 | 963 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 964 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 965 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 966 | extern long nr_blockdev_pages(void); |
1da177e4 | 967 | |
165125e1 JA |
968 | int blk_get_queue(struct request_queue *); |
969 | struct request_queue *blk_alloc_queue(gfp_t); | |
970 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
971 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
972 | |
973 | /* | |
974 | * tag stuff | |
975 | */ | |
4aff5e23 | 976 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
977 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
978 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
979 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
980 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
981 | extern void blk_queue_free_tags(struct request_queue *); | |
982 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
983 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
984 | extern struct blk_queue_tag *blk_init_tags(int); |
985 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 986 | |
f583f492 DS |
987 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
988 | int tag) | |
989 | { | |
990 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
991 | return NULL; | |
992 | return bqt->tag_index[tag]; | |
993 | } | |
fbd9b09a DM |
994 | enum{ |
995 | BLKDEV_WAIT, /* wait for completion */ | |
996 | BLKDEV_BARRIER, /*issue request with barrier */ | |
997 | }; | |
998 | #define BLKDEV_IFL_WAIT (1 << BLKDEV_WAIT) | |
999 | #define BLKDEV_IFL_BARRIER (1 << BLKDEV_BARRIER) | |
1000 | extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *, | |
1001 | unsigned long); | |
1002 | extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, | |
1003 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
3f14d792 DM |
1004 | extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, |
1005 | sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); | |
fb2dce86 | 1006 | static inline int sb_issue_discard(struct super_block *sb, |
3e6053d7 | 1007 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
1008 | { |
1009 | block <<= (sb->s_blocksize_bits - 9); | |
1010 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
746cd1e7 | 1011 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, |
fbd9b09a | 1012 | BLKDEV_IFL_WAIT | BLKDEV_IFL_BARRIER); |
fb2dce86 | 1013 | } |
1da177e4 | 1014 | |
018e0446 | 1015 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 1016 | |
eb28d31b MP |
1017 | enum blk_default_limits { |
1018 | BLK_MAX_SEGMENTS = 128, | |
1019 | BLK_SAFE_MAX_SECTORS = 255, | |
1020 | BLK_DEF_MAX_SECTORS = 1024, | |
1021 | BLK_MAX_SEGMENT_SIZE = 65536, | |
1022 | BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, | |
1023 | }; | |
0e435ac2 | 1024 | |
1da177e4 LT |
1025 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1026 | ||
ae03bf63 MP |
1027 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1028 | { | |
025146e1 | 1029 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1030 | } |
1031 | ||
1032 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1033 | { | |
025146e1 | 1034 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1035 | } |
1036 | ||
1037 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1038 | { | |
025146e1 | 1039 | return q->limits.max_sectors; |
ae03bf63 MP |
1040 | } |
1041 | ||
1042 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1043 | { | |
025146e1 | 1044 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1045 | } |
1046 | ||
8a78362c | 1047 | static inline unsigned short queue_max_segments(struct request_queue *q) |
ae03bf63 | 1048 | { |
8a78362c | 1049 | return q->limits.max_segments; |
ae03bf63 MP |
1050 | } |
1051 | ||
1052 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1053 | { | |
025146e1 | 1054 | return q->limits.max_segment_size; |
ae03bf63 MP |
1055 | } |
1056 | ||
e1defc4f | 1057 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1058 | { |
1059 | int retval = 512; | |
1060 | ||
025146e1 MP |
1061 | if (q && q->limits.logical_block_size) |
1062 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1063 | |
1064 | return retval; | |
1065 | } | |
1066 | ||
e1defc4f | 1067 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1068 | { |
e1defc4f | 1069 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1070 | } |
1071 | ||
c72758f3 MP |
1072 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1073 | { | |
1074 | return q->limits.physical_block_size; | |
1075 | } | |
1076 | ||
ac481c20 MP |
1077 | static inline int bdev_physical_block_size(struct block_device *bdev) |
1078 | { | |
1079 | return queue_physical_block_size(bdev_get_queue(bdev)); | |
1080 | } | |
1081 | ||
c72758f3 MP |
1082 | static inline unsigned int queue_io_min(struct request_queue *q) |
1083 | { | |
1084 | return q->limits.io_min; | |
1085 | } | |
1086 | ||
ac481c20 MP |
1087 | static inline int bdev_io_min(struct block_device *bdev) |
1088 | { | |
1089 | return queue_io_min(bdev_get_queue(bdev)); | |
1090 | } | |
1091 | ||
c72758f3 MP |
1092 | static inline unsigned int queue_io_opt(struct request_queue *q) |
1093 | { | |
1094 | return q->limits.io_opt; | |
1095 | } | |
1096 | ||
ac481c20 MP |
1097 | static inline int bdev_io_opt(struct block_device *bdev) |
1098 | { | |
1099 | return queue_io_opt(bdev_get_queue(bdev)); | |
1100 | } | |
1101 | ||
c72758f3 MP |
1102 | static inline int queue_alignment_offset(struct request_queue *q) |
1103 | { | |
ac481c20 | 1104 | if (q->limits.misaligned) |
c72758f3 MP |
1105 | return -1; |
1106 | ||
ac481c20 | 1107 | return q->limits.alignment_offset; |
c72758f3 MP |
1108 | } |
1109 | ||
e03a72e1 | 1110 | static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) |
81744ee4 MP |
1111 | { |
1112 | unsigned int granularity = max(lim->physical_block_size, lim->io_min); | |
e03a72e1 | 1113 | unsigned int alignment = (sector << 9) & (granularity - 1); |
81744ee4 | 1114 | |
e03a72e1 MP |
1115 | return (granularity + lim->alignment_offset - alignment) |
1116 | & (granularity - 1); | |
c72758f3 MP |
1117 | } |
1118 | ||
ac481c20 MP |
1119 | static inline int bdev_alignment_offset(struct block_device *bdev) |
1120 | { | |
1121 | struct request_queue *q = bdev_get_queue(bdev); | |
1122 | ||
1123 | if (q->limits.misaligned) | |
1124 | return -1; | |
1125 | ||
1126 | if (bdev != bdev->bd_contains) | |
1127 | return bdev->bd_part->alignment_offset; | |
1128 | ||
1129 | return q->limits.alignment_offset; | |
1130 | } | |
1131 | ||
86b37281 MP |
1132 | static inline int queue_discard_alignment(struct request_queue *q) |
1133 | { | |
1134 | if (q->limits.discard_misaligned) | |
1135 | return -1; | |
1136 | ||
1137 | return q->limits.discard_alignment; | |
1138 | } | |
1139 | ||
e03a72e1 | 1140 | static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) |
86b37281 | 1141 | { |
dd3d145d MP |
1142 | unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); |
1143 | ||
1144 | return (lim->discard_granularity + lim->discard_alignment - alignment) | |
1145 | & (lim->discard_granularity - 1); | |
86b37281 MP |
1146 | } |
1147 | ||
98262f27 MP |
1148 | static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) |
1149 | { | |
1150 | if (q->limits.discard_zeroes_data == 1) | |
1151 | return 1; | |
1152 | ||
1153 | return 0; | |
1154 | } | |
1155 | ||
1156 | static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) | |
1157 | { | |
1158 | return queue_discard_zeroes_data(bdev_get_queue(bdev)); | |
1159 | } | |
1160 | ||
165125e1 | 1161 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1162 | { |
482eb689 | 1163 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1164 | } |
1165 | ||
87904074 FT |
1166 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1167 | unsigned int len) | |
1168 | { | |
1169 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1170 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1171 | } | |
1172 | ||
1da177e4 LT |
1173 | /* assumes size > 256 */ |
1174 | static inline unsigned int blksize_bits(unsigned int size) | |
1175 | { | |
1176 | unsigned int bits = 8; | |
1177 | do { | |
1178 | bits++; | |
1179 | size >>= 1; | |
1180 | } while (size > 256); | |
1181 | return bits; | |
1182 | } | |
1183 | ||
2befb9e3 | 1184 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1185 | { |
1186 | return bdev->bd_block_size; | |
1187 | } | |
1188 | ||
1189 | typedef struct {struct page *v;} Sector; | |
1190 | ||
1191 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1192 | ||
1193 | static inline void put_dev_sector(Sector p) | |
1194 | { | |
1195 | page_cache_release(p.v); | |
1196 | } | |
1197 | ||
1198 | struct work_struct; | |
18887ad9 | 1199 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1200 | |
9195291e | 1201 | #ifdef CONFIG_BLK_CGROUP |
28f4197e JA |
1202 | /* |
1203 | * This should not be using sched_clock(). A real patch is in progress | |
1204 | * to fix this up, until that is in place we need to disable preemption | |
1205 | * around sched_clock() in this function and set_io_start_time_ns(). | |
1206 | */ | |
9195291e DS |
1207 | static inline void set_start_time_ns(struct request *req) |
1208 | { | |
28f4197e | 1209 | preempt_disable(); |
9195291e | 1210 | req->start_time_ns = sched_clock(); |
28f4197e | 1211 | preempt_enable(); |
9195291e DS |
1212 | } |
1213 | ||
1214 | static inline void set_io_start_time_ns(struct request *req) | |
1215 | { | |
28f4197e | 1216 | preempt_disable(); |
9195291e | 1217 | req->io_start_time_ns = sched_clock(); |
28f4197e | 1218 | preempt_enable(); |
9195291e | 1219 | } |
84c124da DS |
1220 | |
1221 | static inline uint64_t rq_start_time_ns(struct request *req) | |
1222 | { | |
1223 | return req->start_time_ns; | |
1224 | } | |
1225 | ||
1226 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1227 | { | |
1228 | return req->io_start_time_ns; | |
1229 | } | |
9195291e DS |
1230 | #else |
1231 | static inline void set_start_time_ns(struct request *req) {} | |
1232 | static inline void set_io_start_time_ns(struct request *req) {} | |
84c124da DS |
1233 | static inline uint64_t rq_start_time_ns(struct request *req) |
1234 | { | |
1235 | return 0; | |
1236 | } | |
1237 | static inline uint64_t rq_io_start_time_ns(struct request *req) | |
1238 | { | |
1239 | return 0; | |
1240 | } | |
9195291e DS |
1241 | #endif |
1242 | ||
1da177e4 LT |
1243 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1244 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1245 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1246 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1247 | ||
7ba1ba12 MP |
1248 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1249 | ||
b24498d4 JA |
1250 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1251 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1252 | |
1253 | struct blk_integrity_exchg { | |
1254 | void *prot_buf; | |
1255 | void *data_buf; | |
1256 | sector_t sector; | |
1257 | unsigned int data_size; | |
1258 | unsigned short sector_size; | |
1259 | const char *disk_name; | |
1260 | }; | |
1261 | ||
1262 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1263 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1264 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1265 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1266 | ||
1267 | struct blk_integrity { | |
1268 | integrity_gen_fn *generate_fn; | |
1269 | integrity_vrfy_fn *verify_fn; | |
1270 | integrity_set_tag_fn *set_tag_fn; | |
1271 | integrity_get_tag_fn *get_tag_fn; | |
1272 | ||
1273 | unsigned short flags; | |
1274 | unsigned short tuple_size; | |
1275 | unsigned short sector_size; | |
1276 | unsigned short tag_size; | |
1277 | ||
1278 | const char *name; | |
1279 | ||
1280 | struct kobject kobj; | |
1281 | }; | |
1282 | ||
1283 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1284 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1285 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1286 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1287 | extern int blk_rq_count_integrity_sg(struct request *); | |
1288 | ||
b04accc4 JA |
1289 | static inline |
1290 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1291 | { | |
1292 | return bdev->bd_disk->integrity; | |
1293 | } | |
1294 | ||
b02739b0 MP |
1295 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1296 | { | |
1297 | return disk->integrity; | |
1298 | } | |
1299 | ||
7ba1ba12 MP |
1300 | static inline int blk_integrity_rq(struct request *rq) |
1301 | { | |
d442cc44 MP |
1302 | if (rq->bio == NULL) |
1303 | return 0; | |
1304 | ||
7ba1ba12 MP |
1305 | return bio_integrity(rq->bio); |
1306 | } | |
1307 | ||
1308 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1309 | ||
1310 | #define blk_integrity_rq(rq) (0) | |
1311 | #define blk_rq_count_integrity_sg(a) (0) | |
1312 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1313 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1314 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1315 | #define blk_integrity_compare(a, b) (0) |
1316 | #define blk_integrity_register(a, b) (0) | |
1317 | #define blk_integrity_unregister(a) do { } while (0); | |
1318 | ||
1319 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1320 | ||
08f85851 | 1321 | struct block_device_operations { |
d4430d62 AV |
1322 | int (*open) (struct block_device *, fmode_t); |
1323 | int (*release) (struct gendisk *, fmode_t); | |
1324 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1325 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1326 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1327 | int (*direct_access) (struct block_device *, sector_t, |
1328 | void **, unsigned long *); | |
1329 | int (*media_changed) (struct gendisk *); | |
c3e33e04 | 1330 | void (*unlock_native_capacity) (struct gendisk *); |
08f85851 AV |
1331 | int (*revalidate_disk) (struct gendisk *); |
1332 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
b3a27d05 NG |
1333 | /* this callback is with swap_lock and sometimes page table lock held */ |
1334 | void (*swap_slot_free_notify) (struct block_device *, unsigned long); | |
08f85851 AV |
1335 | struct module *owner; |
1336 | }; | |
1337 | ||
633a08b8 AV |
1338 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1339 | unsigned long); | |
9361401e DH |
1340 | #else /* CONFIG_BLOCK */ |
1341 | /* | |
1342 | * stubs for when the block layer is configured out | |
1343 | */ | |
1344 | #define buffer_heads_over_limit 0 | |
1345 | ||
9361401e DH |
1346 | static inline long nr_blockdev_pages(void) |
1347 | { | |
1348 | return 0; | |
1349 | } | |
1350 | ||
9361401e DH |
1351 | #endif /* CONFIG_BLOCK */ |
1352 | ||
1da177e4 | 1353 | #endif |