Commit | Line | Data |
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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 { | |
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 | ||
1faa16d2 JA |
73 | enum { |
74 | BLK_RW_ASYNC = 0, | |
75 | BLK_RW_SYNC = 1, | |
76 | }; | |
77 | ||
4aff5e23 JA |
78 | /* |
79 | * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being | |
80 | * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a | |
81 | * SCSI cdb. | |
82 | * | |
83 | * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, | |
84 | * typically to differentiate REQ_TYPE_SPECIAL requests. | |
85 | * | |
86 | */ | |
87 | enum { | |
4aff5e23 | 88 | REQ_LB_OP_EJECT = 0x40, /* eject request */ |
1a8e2bdd | 89 | REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
eae9acd1 | 90 | REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
4aff5e23 JA |
91 | }; |
92 | ||
93 | /* | |
d628eaef | 94 | * request type modified bits. first two bits match BIO_RW* bits, important |
4aff5e23 JA |
95 | */ |
96 | enum rq_flag_bits { | |
97 | __REQ_RW, /* not set, read. set, write */ | |
6000a368 MC |
98 | __REQ_FAILFAST_DEV, /* no driver retries of device errors */ |
99 | __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ | |
100 | __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ | |
fb2dce86 | 101 | __REQ_DISCARD, /* request to discard sectors */ |
4aff5e23 JA |
102 | __REQ_SORTED, /* elevator knows about this request */ |
103 | __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ | |
104 | __REQ_HARDBARRIER, /* may not be passed by drive either */ | |
105 | __REQ_FUA, /* forced unit access */ | |
106 | __REQ_NOMERGE, /* don't touch this for merging */ | |
107 | __REQ_STARTED, /* drive already may have started this one */ | |
108 | __REQ_DONTPREP, /* don't call prep for this one */ | |
109 | __REQ_QUEUED, /* uses queueing */ | |
110 | __REQ_ELVPRIV, /* elevator private data attached */ | |
111 | __REQ_FAILED, /* set if the request failed */ | |
112 | __REQ_QUIET, /* don't worry about errors */ | |
113 | __REQ_PREEMPT, /* set for "ide_preempt" requests */ | |
114 | __REQ_ORDERED_COLOR, /* is before or after barrier */ | |
1faa16d2 | 115 | __REQ_RW_SYNC, /* request is sync (sync write or read) */ |
49171e5c | 116 | __REQ_ALLOCED, /* request came from our alloc pool */ |
5404bc7a | 117 | __REQ_RW_META, /* metadata io request */ |
f18573ab | 118 | __REQ_COPY_USER, /* contains copies of user pages */ |
7ba1ba12 | 119 | __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
aeb6fafb | 120 | __REQ_NOIDLE, /* Don't anticipate more IO after this one */ |
42dad764 | 121 | __REQ_IO_STAT, /* account I/O stat */ |
4aff5e23 JA |
122 | __REQ_NR_BITS, /* stops here */ |
123 | }; | |
124 | ||
125 | #define REQ_RW (1 << __REQ_RW) | |
6000a368 MC |
126 | #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
127 | #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) | |
128 | #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) | |
fb2dce86 | 129 | #define REQ_DISCARD (1 << __REQ_DISCARD) |
4aff5e23 JA |
130 | #define REQ_SORTED (1 << __REQ_SORTED) |
131 | #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) | |
132 | #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) | |
133 | #define REQ_FUA (1 << __REQ_FUA) | |
134 | #define REQ_NOMERGE (1 << __REQ_NOMERGE) | |
135 | #define REQ_STARTED (1 << __REQ_STARTED) | |
136 | #define REQ_DONTPREP (1 << __REQ_DONTPREP) | |
137 | #define REQ_QUEUED (1 << __REQ_QUEUED) | |
138 | #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) | |
139 | #define REQ_FAILED (1 << __REQ_FAILED) | |
140 | #define REQ_QUIET (1 << __REQ_QUIET) | |
141 | #define REQ_PREEMPT (1 << __REQ_PREEMPT) | |
142 | #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) | |
143 | #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) | |
49171e5c | 144 | #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
5404bc7a | 145 | #define REQ_RW_META (1 << __REQ_RW_META) |
f18573ab | 146 | #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
7ba1ba12 | 147 | #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
aeb6fafb | 148 | #define REQ_NOIDLE (1 << __REQ_NOIDLE) |
42dad764 | 149 | #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
4aff5e23 | 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 JA |
160 | struct call_single_data csd; |
161 | int cpu; | |
ff856bad | 162 | |
165125e1 | 163 | struct request_queue *q; |
e6a1c874 | 164 | |
4aff5e23 JA |
165 | unsigned int cmd_flags; |
166 | enum rq_cmd_type_bits cmd_type; | |
242f9dcb | 167 | unsigned long atomic_flags; |
1da177e4 | 168 | |
a2dec7b3 TH |
169 | /* the following two fields are internal, NEVER access directly */ |
170 | sector_t __sector; /* sector cursor */ | |
171 | unsigned int __data_len; /* total data len */ | |
1da177e4 LT |
172 | |
173 | struct bio *bio; | |
174 | struct bio *biotail; | |
175 | ||
9817064b | 176 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
177 | /* |
178 | * The rb_node is only used inside the io scheduler, requests | |
179 | * are pruned when moved to the dispatch queue. So let the | |
180 | * completion_data share space with the rb_node. | |
181 | */ | |
182 | union { | |
183 | struct rb_node rb_node; /* sort/lookup */ | |
184 | void *completion_data; | |
185 | }; | |
9817064b | 186 | |
ff7d145f JA |
187 | /* |
188 | * two pointers are available for the IO schedulers, if they need | |
189 | * more they have to dynamically allocate it. | |
190 | */ | |
1da177e4 | 191 | void *elevator_private; |
ff7d145f JA |
192 | void *elevator_private2; |
193 | ||
8f34ee75 | 194 | struct gendisk *rq_disk; |
1da177e4 LT |
195 | unsigned long start_time; |
196 | ||
197 | /* Number of scatter-gather DMA addr+len pairs after | |
198 | * physical address coalescing is performed. | |
199 | */ | |
200 | unsigned short nr_phys_segments; | |
201 | ||
8f34ee75 JA |
202 | unsigned short ioprio; |
203 | ||
731ec497 TH |
204 | void *special; /* opaque pointer available for LLD use */ |
205 | char *buffer; /* kaddr of the current segment if available */ | |
1da177e4 | 206 | |
cdd60262 JA |
207 | int tag; |
208 | int errors; | |
209 | ||
210 | int ref_count; | |
211 | ||
1da177e4 LT |
212 | /* |
213 | * when request is used as a packet command carrier | |
214 | */ | |
d7e3c324 FT |
215 | unsigned short cmd_len; |
216 | unsigned char __cmd[BLK_MAX_CDB]; | |
217 | unsigned char *cmd; | |
1da177e4 | 218 | |
7a85f889 | 219 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 220 | unsigned int sense_len; |
c3a4d78c | 221 | unsigned int resid_len; /* residual count */ |
1da177e4 LT |
222 | void *sense; |
223 | ||
242f9dcb JA |
224 | unsigned long deadline; |
225 | struct list_head timeout_list; | |
1da177e4 | 226 | unsigned int timeout; |
17e01f21 | 227 | int retries; |
1da177e4 | 228 | |
1da177e4 | 229 | /* |
c00895ab | 230 | * completion callback. |
1da177e4 LT |
231 | */ |
232 | rq_end_io_fn *end_io; | |
233 | void *end_io_data; | |
abae1fde FT |
234 | |
235 | /* for bidi */ | |
236 | struct request *next_rq; | |
1da177e4 LT |
237 | }; |
238 | ||
766ca442 FLVC |
239 | static inline unsigned short req_get_ioprio(struct request *req) |
240 | { | |
241 | return req->ioprio; | |
242 | } | |
243 | ||
1da177e4 | 244 | /* |
4aff5e23 | 245 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
246 | * requests. Some step values could eventually be made generic. |
247 | */ | |
248 | struct request_pm_state | |
249 | { | |
250 | /* PM state machine step value, currently driver specific */ | |
251 | int pm_step; | |
252 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
253 | u32 pm_state; | |
254 | void* data; /* for driver use */ | |
255 | }; | |
256 | ||
257 | #include <linux/elevator.h> | |
258 | ||
165125e1 JA |
259 | typedef void (request_fn_proc) (struct request_queue *q); |
260 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
261 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
262 | typedef void (unplug_fn) (struct request_queue *); | |
fb2dce86 | 263 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
264 | |
265 | struct bio_vec; | |
cc371e66 AK |
266 | struct bvec_merge_data { |
267 | struct block_device *bi_bdev; | |
268 | sector_t bi_sector; | |
269 | unsigned bi_size; | |
270 | unsigned long bi_rw; | |
271 | }; | |
272 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
273 | struct bio_vec *); | |
165125e1 | 274 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 275 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 276 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 277 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 278 | |
242f9dcb JA |
279 | enum blk_eh_timer_return { |
280 | BLK_EH_NOT_HANDLED, | |
281 | BLK_EH_HANDLED, | |
282 | BLK_EH_RESET_TIMER, | |
283 | }; | |
284 | ||
285 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
286 | ||
1da177e4 LT |
287 | enum blk_queue_state { |
288 | Queue_down, | |
289 | Queue_up, | |
290 | }; | |
291 | ||
1da177e4 LT |
292 | struct blk_queue_tag { |
293 | struct request **tag_index; /* map of busy tags */ | |
294 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
295 | int busy; /* current depth */ |
296 | int max_depth; /* what we will send to device */ | |
ba025082 | 297 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
298 | atomic_t refcnt; /* map can be shared */ |
299 | }; | |
300 | ||
abf54393 FT |
301 | #define BLK_SCSI_MAX_CMDS (256) |
302 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
303 | ||
025146e1 MP |
304 | struct queue_limits { |
305 | unsigned long bounce_pfn; | |
306 | unsigned long seg_boundary_mask; | |
307 | ||
308 | unsigned int max_hw_sectors; | |
309 | unsigned int max_sectors; | |
310 | unsigned int max_segment_size; | |
c72758f3 MP |
311 | unsigned int physical_block_size; |
312 | unsigned int alignment_offset; | |
313 | unsigned int io_min; | |
314 | unsigned int io_opt; | |
025146e1 MP |
315 | |
316 | unsigned short logical_block_size; | |
317 | unsigned short max_hw_segments; | |
318 | unsigned short max_phys_segments; | |
319 | ||
c72758f3 | 320 | unsigned char misaligned; |
025146e1 MP |
321 | unsigned char no_cluster; |
322 | }; | |
323 | ||
1da177e4 LT |
324 | struct request_queue |
325 | { | |
326 | /* | |
327 | * Together with queue_head for cacheline sharing | |
328 | */ | |
329 | struct list_head queue_head; | |
330 | struct request *last_merge; | |
b374d18a | 331 | struct elevator_queue *elevator; |
1da177e4 LT |
332 | |
333 | /* | |
334 | * the queue request freelist, one for reads and one for writes | |
335 | */ | |
336 | struct request_list rq; | |
337 | ||
338 | request_fn_proc *request_fn; | |
1da177e4 LT |
339 | make_request_fn *make_request_fn; |
340 | prep_rq_fn *prep_rq_fn; | |
341 | unplug_fn *unplug_fn; | |
fb2dce86 | 342 | prepare_discard_fn *prepare_discard_fn; |
1da177e4 | 343 | merge_bvec_fn *merge_bvec_fn; |
1da177e4 | 344 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 345 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 346 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 347 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 348 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 349 | |
8922e16c TH |
350 | /* |
351 | * Dispatch queue sorting | |
352 | */ | |
1b47f531 | 353 | sector_t end_sector; |
8922e16c | 354 | struct request *boundary_rq; |
8922e16c | 355 | |
1da177e4 LT |
356 | /* |
357 | * Auto-unplugging state | |
358 | */ | |
359 | struct timer_list unplug_timer; | |
360 | int unplug_thresh; /* After this many requests */ | |
361 | unsigned long unplug_delay; /* After this many jiffies */ | |
362 | struct work_struct unplug_work; | |
363 | ||
364 | struct backing_dev_info backing_dev_info; | |
365 | ||
366 | /* | |
367 | * The queue owner gets to use this for whatever they like. | |
368 | * ll_rw_blk doesn't touch it. | |
369 | */ | |
370 | void *queuedata; | |
371 | ||
1da177e4 LT |
372 | /* |
373 | * queue needs bounce pages for pages above this limit | |
374 | */ | |
8267e268 | 375 | gfp_t bounce_gfp; |
1da177e4 LT |
376 | |
377 | /* | |
378 | * various queue flags, see QUEUE_* below | |
379 | */ | |
380 | unsigned long queue_flags; | |
381 | ||
382 | /* | |
152587de | 383 | * protects queue structures from reentrancy. ->__queue_lock should |
384 | * _never_ be used directly, it is queue private. always use | |
385 | * ->queue_lock. | |
1da177e4 | 386 | */ |
152587de | 387 | spinlock_t __queue_lock; |
1da177e4 LT |
388 | spinlock_t *queue_lock; |
389 | ||
390 | /* | |
391 | * queue kobject | |
392 | */ | |
393 | struct kobject kobj; | |
394 | ||
395 | /* | |
396 | * queue settings | |
397 | */ | |
398 | unsigned long nr_requests; /* Max # of requests */ | |
399 | unsigned int nr_congestion_on; | |
400 | unsigned int nr_congestion_off; | |
401 | unsigned int nr_batching; | |
402 | ||
fa0ccd83 JB |
403 | void *dma_drain_buffer; |
404 | unsigned int dma_drain_size; | |
e3790c7d | 405 | unsigned int dma_pad_mask; |
1da177e4 LT |
406 | unsigned int dma_alignment; |
407 | ||
408 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 409 | struct list_head tag_busy_list; |
1da177e4 | 410 | |
15853af9 | 411 | unsigned int nr_sorted; |
0a7ae2ff | 412 | unsigned int in_flight[2]; |
1da177e4 | 413 | |
242f9dcb JA |
414 | unsigned int rq_timeout; |
415 | struct timer_list timeout; | |
416 | struct list_head timeout_list; | |
417 | ||
025146e1 MP |
418 | struct queue_limits limits; |
419 | ||
1da177e4 LT |
420 | /* |
421 | * sg stuff | |
422 | */ | |
423 | unsigned int sg_timeout; | |
424 | unsigned int sg_reserved_size; | |
1946089a | 425 | int node; |
6c5c9341 | 426 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 427 | struct blk_trace *blk_trace; |
6c5c9341 | 428 | #endif |
1da177e4 LT |
429 | /* |
430 | * reserved for flush operations | |
431 | */ | |
797e7dbb TH |
432 | unsigned int ordered, next_ordered, ordseq; |
433 | int orderr, ordcolor; | |
434 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
435 | struct request *orig_bar_rq; | |
483f4afc AV |
436 | |
437 | struct mutex sysfs_lock; | |
d351af01 FT |
438 | |
439 | #if defined(CONFIG_BLK_DEV_BSG) | |
440 | struct bsg_class_device bsg_dev; | |
441 | #endif | |
1da177e4 LT |
442 | }; |
443 | ||
1da177e4 LT |
444 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
445 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
446 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
447 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
448 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
449 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
450 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
451 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 452 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 453 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 454 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 455 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 456 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 457 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 458 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 459 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 JA |
460 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
461 | ||
462 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
463 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
0648e10d | 464 | (1 << QUEUE_FLAG_STACKABLE)) |
797e7dbb | 465 | |
8f45c1a5 LT |
466 | static inline int queue_is_locked(struct request_queue *q) |
467 | { | |
7663c1e2 | 468 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
469 | spinlock_t *lock = q->queue_lock; |
470 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
471 | #else |
472 | return 1; | |
473 | #endif | |
8f45c1a5 LT |
474 | } |
475 | ||
75ad23bc NP |
476 | static inline void queue_flag_set_unlocked(unsigned int flag, |
477 | struct request_queue *q) | |
478 | { | |
479 | __set_bit(flag, &q->queue_flags); | |
480 | } | |
481 | ||
e48ec690 JA |
482 | static inline int queue_flag_test_and_clear(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 | __clear_bit(flag, &q->queue_flags); | |
489 | return 1; | |
490 | } | |
491 | ||
492 | return 0; | |
493 | } | |
494 | ||
495 | static inline int queue_flag_test_and_set(unsigned int flag, | |
496 | struct request_queue *q) | |
497 | { | |
498 | WARN_ON_ONCE(!queue_is_locked(q)); | |
499 | ||
500 | if (!test_bit(flag, &q->queue_flags)) { | |
501 | __set_bit(flag, &q->queue_flags); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | return 1; | |
506 | } | |
507 | ||
75ad23bc NP |
508 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
509 | { | |
8f45c1a5 | 510 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
511 | __set_bit(flag, &q->queue_flags); |
512 | } | |
513 | ||
514 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
515 | struct request_queue *q) | |
516 | { | |
517 | __clear_bit(flag, &q->queue_flags); | |
518 | } | |
519 | ||
0a7ae2ff JA |
520 | static inline int queue_in_flight(struct request_queue *q) |
521 | { | |
522 | return q->in_flight[0] + q->in_flight[1]; | |
523 | } | |
524 | ||
75ad23bc NP |
525 | static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) |
526 | { | |
8f45c1a5 | 527 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
528 | __clear_bit(flag, &q->queue_flags); |
529 | } | |
530 | ||
797e7dbb TH |
531 | enum { |
532 | /* | |
533 | * Hardbarrier is supported with one of the following methods. | |
534 | * | |
535 | * NONE : hardbarrier unsupported | |
536 | * DRAIN : ordering by draining is enough | |
537 | * DRAIN_FLUSH : ordering by draining w/ pre and post flushes | |
538 | * DRAIN_FUA : ordering by draining w/ pre flush and FUA write | |
539 | * TAG : ordering by tag is enough | |
540 | * TAG_FLUSH : ordering by tag w/ pre and post flushes | |
541 | * TAG_FUA : ordering by tag w/ pre flush and FUA write | |
542 | */ | |
313e4299 TH |
543 | QUEUE_ORDERED_BY_DRAIN = 0x01, |
544 | QUEUE_ORDERED_BY_TAG = 0x02, | |
545 | QUEUE_ORDERED_DO_PREFLUSH = 0x10, | |
f671620e | 546 | QUEUE_ORDERED_DO_BAR = 0x20, |
313e4299 TH |
547 | QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
548 | QUEUE_ORDERED_DO_FUA = 0x80, | |
549 | ||
550 | QUEUE_ORDERED_NONE = 0x00, | |
551 | ||
f671620e TH |
552 | QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
553 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
554 | QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
555 | QUEUE_ORDERED_DO_PREFLUSH | | |
556 | QUEUE_ORDERED_DO_POSTFLUSH, | |
557 | QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | | |
558 | QUEUE_ORDERED_DO_PREFLUSH | | |
559 | QUEUE_ORDERED_DO_FUA, | |
560 | ||
f671620e TH |
561 | QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
562 | QUEUE_ORDERED_DO_BAR, | |
313e4299 TH |
563 | QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
564 | QUEUE_ORDERED_DO_PREFLUSH | | |
565 | QUEUE_ORDERED_DO_POSTFLUSH, | |
566 | QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | | |
567 | QUEUE_ORDERED_DO_PREFLUSH | | |
568 | QUEUE_ORDERED_DO_FUA, | |
797e7dbb TH |
569 | |
570 | /* | |
571 | * Ordered operation sequence | |
572 | */ | |
573 | QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ | |
574 | QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ | |
575 | QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ | |
576 | QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ | |
577 | QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ | |
578 | QUEUE_ORDSEQ_DONE = 0x20, | |
579 | }; | |
1da177e4 LT |
580 | |
581 | #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) | |
582 | #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) | |
583 | #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) | |
ac9fafa1 | 584 | #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) |
a68bbddb | 585 | #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) |
bc58ba94 | 586 | #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) |
797e7dbb | 587 | #define blk_queue_flushing(q) ((q)->ordseq) |
4ee5eaf4 KU |
588 | #define blk_queue_stackable(q) \ |
589 | test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) | |
1da177e4 | 590 | |
4aff5e23 JA |
591 | #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
592 | #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) | |
593 | #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) | |
594 | #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) | |
595 | ||
6000a368 MC |
596 | #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) |
597 | #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) | |
598 | #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) | |
599 | #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ | |
600 | blk_failfast_transport(rq) || \ | |
601 | blk_failfast_driver(rq)) | |
4aff5e23 | 602 | #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) |
42dad764 | 603 | #define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT) |
96c16743 | 604 | #define blk_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET) |
1da177e4 | 605 | |
e17fc0a1 | 606 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
1da177e4 | 607 | |
4aff5e23 JA |
608 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
609 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 610 | #define blk_pm_request(rq) \ |
4aff5e23 | 611 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 612 | |
ab780f1e | 613 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
4aff5e23 JA |
614 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
615 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
616 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
fb2dce86 | 617 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
abae1fde | 618 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
619 | /* rq->queuelist of dequeued request must be list_empty() */ |
620 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
621 | |
622 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
623 | ||
4aff5e23 | 624 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 625 | |
9e2585a8 | 626 | /* |
1faa16d2 | 627 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 628 | */ |
1faa16d2 JA |
629 | static inline bool rw_is_sync(unsigned int rw_flags) |
630 | { | |
631 | return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); | |
632 | } | |
633 | ||
634 | static inline bool rq_is_sync(struct request *rq) | |
635 | { | |
636 | return rw_is_sync(rq->cmd_flags); | |
637 | } | |
638 | ||
5404bc7a | 639 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
aeb6fafb | 640 | #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) |
9e2585a8 | 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 DW |
673 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
674 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
1da177e4 | 675 | |
1da177e4 LT |
676 | /* |
677 | * q->prep_rq_fn return values | |
678 | */ | |
679 | #define BLKPREP_OK 0 /* serve it */ | |
680 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
681 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
682 | ||
683 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
684 | ||
685 | /* | |
686 | * standard bounce addresses: | |
687 | * | |
688 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
689 | * BLK_BOUNCE_ANY : don't bounce anything | |
690 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
691 | */ | |
2472892a AK |
692 | |
693 | #if BITS_PER_LONG == 32 | |
1da177e4 | 694 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
695 | #else |
696 | #define BLK_BOUNCE_HIGH -1ULL | |
697 | #endif | |
698 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
699 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
700 | ||
3d6392cf JA |
701 | /* |
702 | * default timeout for SG_IO if none specified | |
703 | */ | |
704 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 705 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 706 | |
2a7326b5 | 707 | #ifdef CONFIG_BOUNCE |
1da177e4 | 708 | extern int init_emergency_isa_pool(void); |
165125e1 | 709 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
710 | #else |
711 | static inline int init_emergency_isa_pool(void) | |
712 | { | |
713 | return 0; | |
714 | } | |
165125e1 | 715 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
716 | { |
717 | } | |
718 | #endif /* CONFIG_MMU */ | |
719 | ||
152e283f FT |
720 | struct rq_map_data { |
721 | struct page **pages; | |
722 | int page_order; | |
723 | int nr_entries; | |
56c451f4 | 724 | unsigned long offset; |
97ae77a1 | 725 | int null_mapped; |
152e283f FT |
726 | }; |
727 | ||
5705f702 N |
728 | struct req_iterator { |
729 | int i; | |
730 | struct bio *bio; | |
731 | }; | |
732 | ||
733 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
734 | #define for_each_bio(_bio) \ |
735 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 736 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
737 | if ((rq->bio)) \ |
738 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
739 | ||
5705f702 N |
740 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
741 | __rq_for_each_bio(_iter.bio, _rq) \ | |
742 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
743 | ||
744 | #define rq_iter_last(rq, _iter) \ | |
745 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
746 | ||
1da177e4 LT |
747 | extern int blk_register_queue(struct gendisk *disk); |
748 | extern void blk_unregister_queue(struct gendisk *disk); | |
749 | extern void register_disk(struct gendisk *dev); | |
750 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 751 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 752 | extern void blk_put_request(struct request *); |
165125e1 | 753 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 | 754 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
79eb63e9 BH |
755 | extern struct request *blk_make_request(struct request_queue *, struct bio *, |
756 | gfp_t); | |
165125e1 JA |
757 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); |
758 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 | 759 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 760 | extern int blk_lld_busy(struct request_queue *q); |
b0fd271d KU |
761 | extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, |
762 | struct bio_set *bs, gfp_t gfp_mask, | |
763 | int (*bio_ctr)(struct bio *, struct bio *, void *), | |
764 | void *data); | |
765 | extern void blk_rq_unprep_clone(struct request *rq); | |
82124d60 KU |
766 | extern int blk_insert_cloned_request(struct request_queue *q, |
767 | struct request *rq); | |
165125e1 | 768 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 769 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
770 | extern int blk_remove_plug(struct request_queue *); |
771 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
772 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
773 | unsigned int, void __user *); | |
e915e872 AV |
774 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
775 | struct scsi_ioctl_command __user *); | |
3fcfab16 AM |
776 | |
777 | /* | |
778 | * A queue has just exitted congestion. Note this in the global counter of | |
779 | * congested queues, and wake up anyone who was waiting for requests to be | |
780 | * put back. | |
781 | */ | |
165125e1 | 782 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
783 | { |
784 | clear_bdi_congested(&q->backing_dev_info, rw); | |
785 | } | |
786 | ||
787 | /* | |
788 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
789 | * state flags and increment the global gounter of congested queues. | |
790 | */ | |
165125e1 | 791 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
792 | { |
793 | set_bdi_congested(&q->backing_dev_info, rw); | |
794 | } | |
795 | ||
165125e1 JA |
796 | extern void blk_start_queue(struct request_queue *q); |
797 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 798 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 799 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 800 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 801 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 802 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
803 | struct rq_map_data *, void __user *, unsigned long, |
804 | gfp_t); | |
8e5cfc45 | 805 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
806 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
807 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
808 | struct rq_map_data *, struct sg_iovec *, int, |
809 | unsigned int, gfp_t); | |
165125e1 | 810 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 811 | struct request *, int); |
165125e1 | 812 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 813 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 814 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 815 | |
165125e1 | 816 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
817 | { |
818 | return bdev->bd_disk->queue; | |
819 | } | |
820 | ||
821 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
822 | struct page *page) | |
823 | { | |
824 | if (bdi && bdi->unplug_io_fn) | |
825 | bdi->unplug_io_fn(bdi, page); | |
826 | } | |
827 | ||
828 | static inline void blk_run_address_space(struct address_space *mapping) | |
829 | { | |
830 | if (mapping) | |
831 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
832 | } | |
833 | ||
5efccd17 | 834 | /* |
5b93629b 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_sectors() : sectors left in the entire request | |
839 | * blk_rq_cur_sectors() : sectors left in the current segment | |
5efccd17 | 840 | */ |
5b93629b TH |
841 | static inline sector_t blk_rq_pos(const struct request *rq) |
842 | { | |
a2dec7b3 | 843 | return rq->__sector; |
2e46e8b2 TH |
844 | } |
845 | ||
846 | static inline unsigned int blk_rq_bytes(const struct request *rq) | |
847 | { | |
a2dec7b3 | 848 | return rq->__data_len; |
5b93629b TH |
849 | } |
850 | ||
2e46e8b2 TH |
851 | static inline int blk_rq_cur_bytes(const struct request *rq) |
852 | { | |
853 | return rq->bio ? bio_cur_bytes(rq->bio) : 0; | |
854 | } | |
5efccd17 | 855 | |
5b93629b TH |
856 | static inline unsigned int blk_rq_sectors(const struct request *rq) |
857 | { | |
2e46e8b2 | 858 | return blk_rq_bytes(rq) >> 9; |
5b93629b TH |
859 | } |
860 | ||
861 | static inline unsigned int blk_rq_cur_sectors(const struct request *rq) | |
862 | { | |
2e46e8b2 | 863 | return blk_rq_cur_bytes(rq) >> 9; |
5b93629b TH |
864 | } |
865 | ||
9934c8c0 TH |
866 | /* |
867 | * Request issue related functions. | |
868 | */ | |
869 | extern struct request *blk_peek_request(struct request_queue *q); | |
870 | extern void blk_start_request(struct request *rq); | |
871 | extern struct request *blk_fetch_request(struct request_queue *q); | |
872 | ||
1da177e4 | 873 | /* |
2e60e022 TH |
874 | * Request completion related functions. |
875 | * | |
876 | * blk_update_request() completes given number of bytes and updates | |
877 | * the request without completing it. | |
878 | * | |
f06d9a2b TH |
879 | * blk_end_request() and friends. __blk_end_request() must be called |
880 | * with the request queue spinlock acquired. | |
1da177e4 LT |
881 | * |
882 | * Several drivers define their own end_request and call | |
3bcddeac KU |
883 | * blk_end_request() for parts of the original function. |
884 | * This prevents code duplication in drivers. | |
1da177e4 | 885 | */ |
2e60e022 TH |
886 | extern bool blk_update_request(struct request *rq, int error, |
887 | unsigned int nr_bytes); | |
b1f74493 FT |
888 | extern bool blk_end_request(struct request *rq, int error, |
889 | unsigned int nr_bytes); | |
890 | extern void blk_end_request_all(struct request *rq, int error); | |
891 | extern bool blk_end_request_cur(struct request *rq, int error); | |
892 | extern bool __blk_end_request(struct request *rq, int error, | |
893 | unsigned int nr_bytes); | |
894 | extern void __blk_end_request_all(struct request *rq, int error); | |
895 | extern bool __blk_end_request_cur(struct request *rq, int error); | |
2e60e022 | 896 | |
ff856bad | 897 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
898 | extern void __blk_complete_request(struct request *); |
899 | extern void blk_abort_request(struct request *); | |
11914a53 | 900 | extern void blk_abort_queue(struct request_queue *); |
ff856bad | 901 | |
1da177e4 LT |
902 | /* |
903 | * Access functions for manipulating queue properties | |
904 | */ | |
165125e1 | 905 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 906 | spinlock_t *lock, int node_id); |
165125e1 JA |
907 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
908 | extern void blk_cleanup_queue(struct request_queue *); | |
909 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
910 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
911 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
ae03bf63 | 912 | extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); |
165125e1 JA |
913 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); |
914 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
915 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
e1defc4f | 916 | extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); |
c72758f3 MP |
917 | extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); |
918 | extern void blk_queue_alignment_offset(struct request_queue *q, | |
919 | unsigned int alignment); | |
920 | extern void blk_queue_io_min(struct request_queue *q, unsigned int min); | |
921 | extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); | |
e475bba2 | 922 | extern void blk_set_default_limits(struct queue_limits *lim); |
c72758f3 MP |
923 | extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, |
924 | sector_t offset); | |
925 | extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, | |
926 | sector_t offset); | |
165125e1 | 927 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); |
e3790c7d | 928 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 929 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
930 | extern int blk_queue_dma_drain(struct request_queue *q, |
931 | dma_drain_needed_fn *dma_drain_needed, | |
932 | void *buf, unsigned int size); | |
ef9e3fac | 933 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
934 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
935 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
936 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
937 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 938 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 939 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
fb2dce86 | 940 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
242f9dcb JA |
941 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
942 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 943 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 944 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
8f11b3e9 | 945 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 946 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 947 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 948 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 949 | |
165125e1 | 950 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 951 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 952 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 953 | extern long nr_blockdev_pages(void); |
1da177e4 | 954 | |
165125e1 JA |
955 | int blk_get_queue(struct request_queue *); |
956 | struct request_queue *blk_alloc_queue(gfp_t); | |
957 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
958 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
959 | |
960 | /* | |
961 | * tag stuff | |
962 | */ | |
4aff5e23 | 963 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
964 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
965 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
966 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
967 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
968 | extern void blk_queue_free_tags(struct request_queue *); | |
969 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
970 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
971 | extern struct blk_queue_tag *blk_init_tags(int); |
972 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 973 | |
f583f492 DS |
974 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
975 | int tag) | |
976 | { | |
977 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
978 | return NULL; | |
979 | return bqt->tag_index[tag]; | |
980 | } | |
981 | ||
1da177e4 | 982 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
3e6053d7 HD |
983 | extern int blkdev_issue_discard(struct block_device *, |
984 | sector_t sector, sector_t nr_sects, gfp_t); | |
fb2dce86 DW |
985 | |
986 | static inline int sb_issue_discard(struct super_block *sb, | |
3e6053d7 | 987 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
988 | { |
989 | block <<= (sb->s_blocksize_bits - 9); | |
990 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
3e6053d7 | 991 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
fb2dce86 | 992 | } |
1da177e4 | 993 | |
018e0446 | 994 | extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); |
0b07de85 | 995 | |
1da177e4 LT |
996 | #define MAX_PHYS_SEGMENTS 128 |
997 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
998 | #define SAFE_MAX_SECTORS 255 |
999 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
1000 | |
1001 | #define MAX_SEGMENT_SIZE 65536 | |
1002 | ||
0e435ac2 MB |
1003 | #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL |
1004 | ||
1da177e4 LT |
1005 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1006 | ||
ae03bf63 MP |
1007 | static inline unsigned long queue_bounce_pfn(struct request_queue *q) |
1008 | { | |
025146e1 | 1009 | return q->limits.bounce_pfn; |
ae03bf63 MP |
1010 | } |
1011 | ||
1012 | static inline unsigned long queue_segment_boundary(struct request_queue *q) | |
1013 | { | |
025146e1 | 1014 | return q->limits.seg_boundary_mask; |
ae03bf63 MP |
1015 | } |
1016 | ||
1017 | static inline unsigned int queue_max_sectors(struct request_queue *q) | |
1018 | { | |
025146e1 | 1019 | return q->limits.max_sectors; |
ae03bf63 MP |
1020 | } |
1021 | ||
1022 | static inline unsigned int queue_max_hw_sectors(struct request_queue *q) | |
1023 | { | |
025146e1 | 1024 | return q->limits.max_hw_sectors; |
ae03bf63 MP |
1025 | } |
1026 | ||
1027 | static inline unsigned short queue_max_hw_segments(struct request_queue *q) | |
1028 | { | |
025146e1 | 1029 | return q->limits.max_hw_segments; |
ae03bf63 MP |
1030 | } |
1031 | ||
1032 | static inline unsigned short queue_max_phys_segments(struct request_queue *q) | |
1033 | { | |
025146e1 | 1034 | return q->limits.max_phys_segments; |
ae03bf63 MP |
1035 | } |
1036 | ||
1037 | static inline unsigned int queue_max_segment_size(struct request_queue *q) | |
1038 | { | |
025146e1 | 1039 | return q->limits.max_segment_size; |
ae03bf63 MP |
1040 | } |
1041 | ||
e1defc4f | 1042 | static inline unsigned short queue_logical_block_size(struct request_queue *q) |
1da177e4 LT |
1043 | { |
1044 | int retval = 512; | |
1045 | ||
025146e1 MP |
1046 | if (q && q->limits.logical_block_size) |
1047 | retval = q->limits.logical_block_size; | |
1da177e4 LT |
1048 | |
1049 | return retval; | |
1050 | } | |
1051 | ||
e1defc4f | 1052 | static inline unsigned short bdev_logical_block_size(struct block_device *bdev) |
1da177e4 | 1053 | { |
e1defc4f | 1054 | return queue_logical_block_size(bdev_get_queue(bdev)); |
1da177e4 LT |
1055 | } |
1056 | ||
c72758f3 MP |
1057 | static inline unsigned int queue_physical_block_size(struct request_queue *q) |
1058 | { | |
1059 | return q->limits.physical_block_size; | |
1060 | } | |
1061 | ||
1062 | static inline unsigned int queue_io_min(struct request_queue *q) | |
1063 | { | |
1064 | return q->limits.io_min; | |
1065 | } | |
1066 | ||
1067 | static inline unsigned int queue_io_opt(struct request_queue *q) | |
1068 | { | |
1069 | return q->limits.io_opt; | |
1070 | } | |
1071 | ||
1072 | static inline int queue_alignment_offset(struct request_queue *q) | |
1073 | { | |
1074 | if (q && q->limits.misaligned) | |
1075 | return -1; | |
1076 | ||
1077 | if (q && q->limits.alignment_offset) | |
1078 | return q->limits.alignment_offset; | |
1079 | ||
1080 | return 0; | |
1081 | } | |
1082 | ||
1083 | static inline int queue_sector_alignment_offset(struct request_queue *q, | |
1084 | sector_t sector) | |
1085 | { | |
1086 | return ((sector << 9) - q->limits.alignment_offset) | |
1087 | & (q->limits.io_min - 1); | |
1088 | } | |
1089 | ||
165125e1 | 1090 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1091 | { |
482eb689 | 1092 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1093 | } |
1094 | ||
87904074 FT |
1095 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1096 | unsigned int len) | |
1097 | { | |
1098 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1099 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1100 | } | |
1101 | ||
1da177e4 LT |
1102 | /* assumes size > 256 */ |
1103 | static inline unsigned int blksize_bits(unsigned int size) | |
1104 | { | |
1105 | unsigned int bits = 8; | |
1106 | do { | |
1107 | bits++; | |
1108 | size >>= 1; | |
1109 | } while (size > 256); | |
1110 | return bits; | |
1111 | } | |
1112 | ||
2befb9e3 | 1113 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1114 | { |
1115 | return bdev->bd_block_size; | |
1116 | } | |
1117 | ||
1118 | typedef struct {struct page *v;} Sector; | |
1119 | ||
1120 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1121 | ||
1122 | static inline void put_dev_sector(Sector p) | |
1123 | { | |
1124 | page_cache_release(p.v); | |
1125 | } | |
1126 | ||
1127 | struct work_struct; | |
18887ad9 | 1128 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1129 | |
1da177e4 LT |
1130 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1131 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1132 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1133 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1134 | ||
7ba1ba12 MP |
1135 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1136 | ||
b24498d4 JA |
1137 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1138 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1139 | |
1140 | struct blk_integrity_exchg { | |
1141 | void *prot_buf; | |
1142 | void *data_buf; | |
1143 | sector_t sector; | |
1144 | unsigned int data_size; | |
1145 | unsigned short sector_size; | |
1146 | const char *disk_name; | |
1147 | }; | |
1148 | ||
1149 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1150 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1151 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1152 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1153 | ||
1154 | struct blk_integrity { | |
1155 | integrity_gen_fn *generate_fn; | |
1156 | integrity_vrfy_fn *verify_fn; | |
1157 | integrity_set_tag_fn *set_tag_fn; | |
1158 | integrity_get_tag_fn *get_tag_fn; | |
1159 | ||
1160 | unsigned short flags; | |
1161 | unsigned short tuple_size; | |
1162 | unsigned short sector_size; | |
1163 | unsigned short tag_size; | |
1164 | ||
1165 | const char *name; | |
1166 | ||
1167 | struct kobject kobj; | |
1168 | }; | |
1169 | ||
1170 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1171 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1172 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1173 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1174 | extern int blk_rq_count_integrity_sg(struct request *); | |
1175 | ||
b04accc4 JA |
1176 | static inline |
1177 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1178 | { | |
1179 | return bdev->bd_disk->integrity; | |
1180 | } | |
1181 | ||
b02739b0 MP |
1182 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1183 | { | |
1184 | return disk->integrity; | |
1185 | } | |
1186 | ||
7ba1ba12 MP |
1187 | static inline int blk_integrity_rq(struct request *rq) |
1188 | { | |
d442cc44 MP |
1189 | if (rq->bio == NULL) |
1190 | return 0; | |
1191 | ||
7ba1ba12 MP |
1192 | return bio_integrity(rq->bio); |
1193 | } | |
1194 | ||
1195 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1196 | ||
1197 | #define blk_integrity_rq(rq) (0) | |
1198 | #define blk_rq_count_integrity_sg(a) (0) | |
1199 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1200 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1201 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1202 | #define blk_integrity_compare(a, b) (0) |
1203 | #define blk_integrity_register(a, b) (0) | |
1204 | #define blk_integrity_unregister(a) do { } while (0); | |
1205 | ||
1206 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1207 | ||
08f85851 | 1208 | struct block_device_operations { |
d4430d62 AV |
1209 | int (*open) (struct block_device *, fmode_t); |
1210 | int (*release) (struct gendisk *, fmode_t); | |
1211 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1212 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1213 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1214 | int (*direct_access) (struct block_device *, sector_t, |
1215 | void **, unsigned long *); | |
1216 | int (*media_changed) (struct gendisk *); | |
db429e9e BZ |
1217 | unsigned long long (*set_capacity) (struct gendisk *, |
1218 | unsigned long long); | |
08f85851 AV |
1219 | int (*revalidate_disk) (struct gendisk *); |
1220 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
1221 | struct module *owner; | |
1222 | }; | |
1223 | ||
633a08b8 AV |
1224 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1225 | unsigned long); | |
9361401e DH |
1226 | #else /* CONFIG_BLOCK */ |
1227 | /* | |
1228 | * stubs for when the block layer is configured out | |
1229 | */ | |
1230 | #define buffer_heads_over_limit 0 | |
1231 | ||
9361401e DH |
1232 | static inline long nr_blockdev_pages(void) |
1233 | { | |
1234 | return 0; | |
1235 | } | |
1236 | ||
9361401e DH |
1237 | #endif /* CONFIG_BLOCK */ |
1238 | ||
1da177e4 | 1239 | #endif |