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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 LT |
168 | |
169 | /* Maintain bio traversal state for part by part I/O submission. | |
170 | * hard_* are block layer internals, no driver should touch them! | |
171 | */ | |
172 | ||
173 | sector_t sector; /* next sector to submit */ | |
e6a1c874 | 174 | sector_t hard_sector; /* next sector to complete */ |
1da177e4 | 175 | unsigned long nr_sectors; /* no. of sectors left to submit */ |
e6a1c874 | 176 | unsigned long hard_nr_sectors; /* no. of sectors left to complete */ |
1da177e4 LT |
177 | /* no. of sectors left to submit in the current segment */ |
178 | unsigned int current_nr_sectors; | |
179 | ||
1da177e4 LT |
180 | /* no. of sectors left to complete in the current segment */ |
181 | unsigned int hard_cur_sectors; | |
182 | ||
183 | struct bio *bio; | |
184 | struct bio *biotail; | |
185 | ||
9817064b | 186 | struct hlist_node hash; /* merge hash */ |
e6a1c874 JA |
187 | /* |
188 | * The rb_node is only used inside the io scheduler, requests | |
189 | * are pruned when moved to the dispatch queue. So let the | |
190 | * completion_data share space with the rb_node. | |
191 | */ | |
192 | union { | |
193 | struct rb_node rb_node; /* sort/lookup */ | |
194 | void *completion_data; | |
195 | }; | |
9817064b | 196 | |
ff7d145f JA |
197 | /* |
198 | * two pointers are available for the IO schedulers, if they need | |
199 | * more they have to dynamically allocate it. | |
200 | */ | |
1da177e4 | 201 | void *elevator_private; |
ff7d145f JA |
202 | void *elevator_private2; |
203 | ||
8f34ee75 | 204 | struct gendisk *rq_disk; |
1da177e4 LT |
205 | unsigned long start_time; |
206 | ||
207 | /* Number of scatter-gather DMA addr+len pairs after | |
208 | * physical address coalescing is performed. | |
209 | */ | |
210 | unsigned short nr_phys_segments; | |
211 | ||
8f34ee75 JA |
212 | unsigned short ioprio; |
213 | ||
1da177e4 | 214 | void *special; |
8f34ee75 | 215 | char *buffer; |
1da177e4 | 216 | |
cdd60262 JA |
217 | int tag; |
218 | int errors; | |
219 | ||
220 | int ref_count; | |
221 | ||
1da177e4 LT |
222 | /* |
223 | * when request is used as a packet command carrier | |
224 | */ | |
d7e3c324 FT |
225 | unsigned short cmd_len; |
226 | unsigned char __cmd[BLK_MAX_CDB]; | |
227 | unsigned char *cmd; | |
1da177e4 LT |
228 | |
229 | unsigned int data_len; | |
7a85f889 | 230 | unsigned int extra_len; /* length of alignment and padding */ |
1da177e4 | 231 | unsigned int sense_len; |
8f34ee75 | 232 | void *data; |
1da177e4 LT |
233 | void *sense; |
234 | ||
242f9dcb JA |
235 | unsigned long deadline; |
236 | struct list_head timeout_list; | |
1da177e4 | 237 | unsigned int timeout; |
17e01f21 | 238 | int retries; |
1da177e4 | 239 | |
1da177e4 | 240 | /* |
c00895ab | 241 | * completion callback. |
1da177e4 LT |
242 | */ |
243 | rq_end_io_fn *end_io; | |
244 | void *end_io_data; | |
abae1fde FT |
245 | |
246 | /* for bidi */ | |
247 | struct request *next_rq; | |
1da177e4 LT |
248 | }; |
249 | ||
766ca442 FLVC |
250 | static inline unsigned short req_get_ioprio(struct request *req) |
251 | { | |
252 | return req->ioprio; | |
253 | } | |
254 | ||
1da177e4 | 255 | /* |
4aff5e23 | 256 | * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
1da177e4 LT |
257 | * requests. Some step values could eventually be made generic. |
258 | */ | |
259 | struct request_pm_state | |
260 | { | |
261 | /* PM state machine step value, currently driver specific */ | |
262 | int pm_step; | |
263 | /* requested PM state value (S1, S2, S3, S4, ...) */ | |
264 | u32 pm_state; | |
265 | void* data; /* for driver use */ | |
266 | }; | |
267 | ||
268 | #include <linux/elevator.h> | |
269 | ||
165125e1 JA |
270 | typedef void (request_fn_proc) (struct request_queue *q); |
271 | typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); | |
272 | typedef int (prep_rq_fn) (struct request_queue *, struct request *); | |
273 | typedef void (unplug_fn) (struct request_queue *); | |
fb2dce86 | 274 | typedef int (prepare_discard_fn) (struct request_queue *, struct request *); |
1da177e4 LT |
275 | |
276 | struct bio_vec; | |
cc371e66 AK |
277 | struct bvec_merge_data { |
278 | struct block_device *bi_bdev; | |
279 | sector_t bi_sector; | |
280 | unsigned bi_size; | |
281 | unsigned long bi_rw; | |
282 | }; | |
283 | typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, | |
284 | struct bio_vec *); | |
165125e1 | 285 | typedef void (prepare_flush_fn) (struct request_queue *, struct request *); |
ff856bad | 286 | typedef void (softirq_done_fn)(struct request *); |
2fb98e84 | 287 | typedef int (dma_drain_needed_fn)(struct request *); |
ef9e3fac | 288 | typedef int (lld_busy_fn) (struct request_queue *q); |
1da177e4 | 289 | |
242f9dcb JA |
290 | enum blk_eh_timer_return { |
291 | BLK_EH_NOT_HANDLED, | |
292 | BLK_EH_HANDLED, | |
293 | BLK_EH_RESET_TIMER, | |
294 | }; | |
295 | ||
296 | typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); | |
297 | ||
1da177e4 LT |
298 | enum blk_queue_state { |
299 | Queue_down, | |
300 | Queue_up, | |
301 | }; | |
302 | ||
1da177e4 LT |
303 | struct blk_queue_tag { |
304 | struct request **tag_index; /* map of busy tags */ | |
305 | unsigned long *tag_map; /* bit map of free/busy tags */ | |
1da177e4 LT |
306 | int busy; /* current depth */ |
307 | int max_depth; /* what we will send to device */ | |
ba025082 | 308 | int real_max_depth; /* what the array can hold */ |
1da177e4 LT |
309 | atomic_t refcnt; /* map can be shared */ |
310 | }; | |
311 | ||
abf54393 FT |
312 | #define BLK_SCSI_MAX_CMDS (256) |
313 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) | |
314 | ||
4beab5c6 | 315 | struct blk_cmd_filter { |
abf54393 FT |
316 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
317 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; | |
318 | struct kobject kobj; | |
319 | }; | |
320 | ||
1da177e4 LT |
321 | struct request_queue |
322 | { | |
323 | /* | |
324 | * Together with queue_head for cacheline sharing | |
325 | */ | |
326 | struct list_head queue_head; | |
327 | struct request *last_merge; | |
b374d18a | 328 | struct elevator_queue *elevator; |
1da177e4 LT |
329 | |
330 | /* | |
331 | * the queue request freelist, one for reads and one for writes | |
332 | */ | |
333 | struct request_list rq; | |
334 | ||
335 | request_fn_proc *request_fn; | |
1da177e4 LT |
336 | make_request_fn *make_request_fn; |
337 | prep_rq_fn *prep_rq_fn; | |
338 | unplug_fn *unplug_fn; | |
fb2dce86 | 339 | prepare_discard_fn *prepare_discard_fn; |
1da177e4 | 340 | merge_bvec_fn *merge_bvec_fn; |
1da177e4 | 341 | prepare_flush_fn *prepare_flush_fn; |
ff856bad | 342 | softirq_done_fn *softirq_done_fn; |
242f9dcb | 343 | rq_timed_out_fn *rq_timed_out_fn; |
2fb98e84 | 344 | dma_drain_needed_fn *dma_drain_needed; |
ef9e3fac | 345 | lld_busy_fn *lld_busy_fn; |
1da177e4 | 346 | |
8922e16c TH |
347 | /* |
348 | * Dispatch queue sorting | |
349 | */ | |
1b47f531 | 350 | sector_t end_sector; |
8922e16c | 351 | struct request *boundary_rq; |
8922e16c | 352 | |
1da177e4 LT |
353 | /* |
354 | * Auto-unplugging state | |
355 | */ | |
356 | struct timer_list unplug_timer; | |
357 | int unplug_thresh; /* After this many requests */ | |
358 | unsigned long unplug_delay; /* After this many jiffies */ | |
359 | struct work_struct unplug_work; | |
360 | ||
361 | struct backing_dev_info backing_dev_info; | |
362 | ||
363 | /* | |
364 | * The queue owner gets to use this for whatever they like. | |
365 | * ll_rw_blk doesn't touch it. | |
366 | */ | |
367 | void *queuedata; | |
368 | ||
1da177e4 LT |
369 | /* |
370 | * queue needs bounce pages for pages above this limit | |
371 | */ | |
372 | unsigned long bounce_pfn; | |
8267e268 | 373 | gfp_t bounce_gfp; |
1da177e4 LT |
374 | |
375 | /* | |
376 | * various queue flags, see QUEUE_* below | |
377 | */ | |
378 | unsigned long queue_flags; | |
379 | ||
380 | /* | |
152587de JA |
381 | * protects queue structures from reentrancy. ->__queue_lock should |
382 | * _never_ be used directly, it is queue private. always use | |
383 | * ->queue_lock. | |
1da177e4 | 384 | */ |
152587de | 385 | spinlock_t __queue_lock; |
1da177e4 LT |
386 | spinlock_t *queue_lock; |
387 | ||
388 | /* | |
389 | * queue kobject | |
390 | */ | |
391 | struct kobject kobj; | |
392 | ||
393 | /* | |
394 | * queue settings | |
395 | */ | |
396 | unsigned long nr_requests; /* Max # of requests */ | |
397 | unsigned int nr_congestion_on; | |
398 | unsigned int nr_congestion_off; | |
399 | unsigned int nr_batching; | |
400 | ||
2cb2e147 JA |
401 | unsigned int max_sectors; |
402 | unsigned int max_hw_sectors; | |
1da177e4 LT |
403 | unsigned short max_phys_segments; |
404 | unsigned short max_hw_segments; | |
405 | unsigned short hardsect_size; | |
406 | unsigned int max_segment_size; | |
407 | ||
408 | unsigned long seg_boundary_mask; | |
fa0ccd83 JB |
409 | void *dma_drain_buffer; |
410 | unsigned int dma_drain_size; | |
e3790c7d | 411 | unsigned int dma_pad_mask; |
1da177e4 LT |
412 | unsigned int dma_alignment; |
413 | ||
414 | struct blk_queue_tag *queue_tags; | |
6eca9004 | 415 | struct list_head tag_busy_list; |
1da177e4 | 416 | |
15853af9 | 417 | unsigned int nr_sorted; |
1da177e4 LT |
418 | unsigned int in_flight; |
419 | ||
242f9dcb JA |
420 | unsigned int rq_timeout; |
421 | struct timer_list timeout; | |
422 | struct list_head timeout_list; | |
423 | ||
1da177e4 LT |
424 | /* |
425 | * sg stuff | |
426 | */ | |
427 | unsigned int sg_timeout; | |
428 | unsigned int sg_reserved_size; | |
1946089a | 429 | int node; |
6c5c9341 | 430 | #ifdef CONFIG_BLK_DEV_IO_TRACE |
2056a782 | 431 | struct blk_trace *blk_trace; |
6c5c9341 | 432 | #endif |
1da177e4 LT |
433 | /* |
434 | * reserved for flush operations | |
435 | */ | |
797e7dbb TH |
436 | unsigned int ordered, next_ordered, ordseq; |
437 | int orderr, ordcolor; | |
438 | struct request pre_flush_rq, bar_rq, post_flush_rq; | |
439 | struct request *orig_bar_rq; | |
483f4afc AV |
440 | |
441 | struct mutex sysfs_lock; | |
d351af01 FT |
442 | |
443 | #if defined(CONFIG_BLK_DEV_BSG) | |
444 | struct bsg_class_device bsg_dev; | |
445 | #endif | |
4beab5c6 | 446 | struct blk_cmd_filter cmd_filter; |
1da177e4 LT |
447 | }; |
448 | ||
1da177e4 LT |
449 | #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
450 | #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ | |
451 | #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ | |
1faa16d2 JA |
452 | #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ |
453 | #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ | |
1da177e4 LT |
454 | #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ |
455 | #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ | |
456 | #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ | |
64521d1a | 457 | #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
abae1fde | 458 | #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
ac9fafa1 | 459 | #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
c7c22e4d | 460 | #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
581d4e28 | 461 | #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
4ee5eaf4 | 462 | #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
a68bbddb | 463 | #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
88e740f1 | 464 | #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
bc58ba94 JA |
465 | #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
466 | ||
467 | #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ | |
468 | (1 << QUEUE_FLAG_CLUSTER) | \ | |
0648e10d | 469 | (1 << QUEUE_FLAG_STACKABLE)) |
797e7dbb | 470 | |
8f45c1a5 LT |
471 | static inline int queue_is_locked(struct request_queue *q) |
472 | { | |
7663c1e2 | 473 | #ifdef CONFIG_SMP |
8f45c1a5 LT |
474 | spinlock_t *lock = q->queue_lock; |
475 | return lock && spin_is_locked(lock); | |
7663c1e2 JA |
476 | #else |
477 | return 1; | |
478 | #endif | |
8f45c1a5 LT |
479 | } |
480 | ||
75ad23bc NP |
481 | static inline void queue_flag_set_unlocked(unsigned int flag, |
482 | struct request_queue *q) | |
483 | { | |
484 | __set_bit(flag, &q->queue_flags); | |
485 | } | |
486 | ||
e48ec690 JA |
487 | static inline int queue_flag_test_and_clear(unsigned int flag, |
488 | struct request_queue *q) | |
489 | { | |
490 | WARN_ON_ONCE(!queue_is_locked(q)); | |
491 | ||
492 | if (test_bit(flag, &q->queue_flags)) { | |
493 | __clear_bit(flag, &q->queue_flags); | |
494 | return 1; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static inline int queue_flag_test_and_set(unsigned int flag, | |
501 | struct request_queue *q) | |
502 | { | |
503 | WARN_ON_ONCE(!queue_is_locked(q)); | |
504 | ||
505 | if (!test_bit(flag, &q->queue_flags)) { | |
506 | __set_bit(flag, &q->queue_flags); | |
507 | return 0; | |
508 | } | |
509 | ||
510 | return 1; | |
511 | } | |
512 | ||
75ad23bc NP |
513 | static inline void queue_flag_set(unsigned int flag, struct request_queue *q) |
514 | { | |
8f45c1a5 | 515 | WARN_ON_ONCE(!queue_is_locked(q)); |
75ad23bc NP |
516 | __set_bit(flag, &q->queue_flags); |
517 | } | |
518 | ||
519 | static inline void queue_flag_clear_unlocked(unsigned int flag, | |
520 | struct request_queue *q) | |
521 | { | |
522 | __clear_bit(flag, &q->queue_flags); | |
523 | } | |
524 | ||
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) |
1da177e4 | 604 | |
e17fc0a1 | 605 | #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
1da177e4 | 606 | |
4aff5e23 JA |
607 | #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
608 | #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) | |
1da177e4 | 609 | #define blk_pm_request(rq) \ |
4aff5e23 | 610 | (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
1da177e4 | 611 | |
ab780f1e | 612 | #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
4aff5e23 JA |
613 | #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
614 | #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) | |
615 | #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) | |
fb2dce86 | 616 | #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
abae1fde | 617 | #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) |
336cdb40 KU |
618 | /* rq->queuelist of dequeued request must be list_empty() */ |
619 | #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) | |
1da177e4 LT |
620 | |
621 | #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) | |
622 | ||
4aff5e23 | 623 | #define rq_data_dir(rq) ((rq)->cmd_flags & 1) |
1da177e4 | 624 | |
9e2585a8 | 625 | /* |
1faa16d2 | 626 | * We regard a request as sync, if either a read or a sync write |
9e2585a8 | 627 | */ |
1faa16d2 JA |
628 | static inline bool rw_is_sync(unsigned int rw_flags) |
629 | { | |
630 | return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); | |
631 | } | |
632 | ||
633 | static inline bool rq_is_sync(struct request *rq) | |
634 | { | |
635 | return rw_is_sync(rq->cmd_flags); | |
636 | } | |
637 | ||
5404bc7a | 638 | #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
aeb6fafb | 639 | #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) |
9e2585a8 | 640 | |
1faa16d2 | 641 | static inline int blk_queue_full(struct request_queue *q, int sync) |
1da177e4 | 642 | { |
1faa16d2 JA |
643 | if (sync) |
644 | return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); | |
645 | return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); | |
1da177e4 LT |
646 | } |
647 | ||
1faa16d2 | 648 | static inline void blk_set_queue_full(struct request_queue *q, int sync) |
1da177e4 | 649 | { |
1faa16d2 JA |
650 | if (sync) |
651 | queue_flag_set(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 652 | else |
1faa16d2 | 653 | queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
654 | } |
655 | ||
1faa16d2 | 656 | static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
1da177e4 | 657 | { |
1faa16d2 JA |
658 | if (sync) |
659 | queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); | |
1da177e4 | 660 | else |
1faa16d2 | 661 | queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
1da177e4 LT |
662 | } |
663 | ||
664 | ||
665 | /* | |
666 | * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may | |
667 | * it already be started by driver. | |
668 | */ | |
669 | #define RQ_NOMERGE_FLAGS \ | |
670 | (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) | |
671 | #define rq_mergeable(rq) \ | |
e17fc0a1 DW |
672 | (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
673 | (blk_discard_rq(rq) || blk_fs_request((rq)))) | |
1da177e4 | 674 | |
1da177e4 LT |
675 | /* |
676 | * q->prep_rq_fn return values | |
677 | */ | |
678 | #define BLKPREP_OK 0 /* serve it */ | |
679 | #define BLKPREP_KILL 1 /* fatal error, kill */ | |
680 | #define BLKPREP_DEFER 2 /* leave on queue */ | |
681 | ||
682 | extern unsigned long blk_max_low_pfn, blk_max_pfn; | |
683 | ||
684 | /* | |
685 | * standard bounce addresses: | |
686 | * | |
687 | * BLK_BOUNCE_HIGH : bounce all highmem pages | |
688 | * BLK_BOUNCE_ANY : don't bounce anything | |
689 | * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary | |
690 | */ | |
2472892a AK |
691 | |
692 | #if BITS_PER_LONG == 32 | |
1da177e4 | 693 | #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) |
2472892a AK |
694 | #else |
695 | #define BLK_BOUNCE_HIGH -1ULL | |
696 | #endif | |
697 | #define BLK_BOUNCE_ANY (-1ULL) | |
1da177e4 LT |
698 | #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) |
699 | ||
3d6392cf JA |
700 | /* |
701 | * default timeout for SG_IO if none specified | |
702 | */ | |
703 | #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) | |
f2f1fa78 | 704 | #define BLK_MIN_SG_TIMEOUT (7 * HZ) |
3d6392cf | 705 | |
2a7326b5 | 706 | #ifdef CONFIG_BOUNCE |
1da177e4 | 707 | extern int init_emergency_isa_pool(void); |
165125e1 | 708 | extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); |
1da177e4 LT |
709 | #else |
710 | static inline int init_emergency_isa_pool(void) | |
711 | { | |
712 | return 0; | |
713 | } | |
165125e1 | 714 | static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) |
1da177e4 LT |
715 | { |
716 | } | |
717 | #endif /* CONFIG_MMU */ | |
718 | ||
152e283f FT |
719 | struct rq_map_data { |
720 | struct page **pages; | |
721 | int page_order; | |
722 | int nr_entries; | |
56c451f4 | 723 | unsigned long offset; |
97ae77a1 | 724 | int null_mapped; |
152e283f FT |
725 | }; |
726 | ||
5705f702 N |
727 | struct req_iterator { |
728 | int i; | |
729 | struct bio *bio; | |
730 | }; | |
731 | ||
732 | /* This should not be used directly - use rq_for_each_segment */ | |
1e428079 JA |
733 | #define for_each_bio(_bio) \ |
734 | for (; _bio; _bio = _bio->bi_next) | |
5705f702 | 735 | #define __rq_for_each_bio(_bio, rq) \ |
1da177e4 LT |
736 | if ((rq->bio)) \ |
737 | for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) | |
738 | ||
5705f702 N |
739 | #define rq_for_each_segment(bvl, _rq, _iter) \ |
740 | __rq_for_each_bio(_iter.bio, _rq) \ | |
741 | bio_for_each_segment(bvl, _iter.bio, _iter.i) | |
742 | ||
743 | #define rq_iter_last(rq, _iter) \ | |
744 | (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) | |
745 | ||
1da177e4 LT |
746 | extern int blk_register_queue(struct gendisk *disk); |
747 | extern void blk_unregister_queue(struct gendisk *disk); | |
748 | extern void register_disk(struct gendisk *dev); | |
749 | extern void generic_make_request(struct bio *bio); | |
2a4aa30c | 750 | extern void blk_rq_init(struct request_queue *q, struct request *rq); |
1da177e4 | 751 | extern void blk_put_request(struct request *); |
165125e1 | 752 | extern void __blk_put_request(struct request_queue *, struct request *); |
165125e1 JA |
753 | extern struct request *blk_get_request(struct request_queue *, int, gfp_t); |
754 | extern void blk_insert_request(struct request_queue *, struct request *, int, void *); | |
755 | extern void blk_requeue_request(struct request_queue *, struct request *); | |
82124d60 | 756 | extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
ef9e3fac | 757 | extern int blk_lld_busy(struct request_queue *q); |
82124d60 KU |
758 | extern int blk_insert_cloned_request(struct request_queue *q, |
759 | struct request *rq); | |
165125e1 | 760 | extern void blk_plug_device(struct request_queue *); |
6c5e0c4d | 761 | extern void blk_plug_device_unlocked(struct request_queue *); |
165125e1 JA |
762 | extern int blk_remove_plug(struct request_queue *); |
763 | extern void blk_recount_segments(struct request_queue *, struct bio *); | |
74f3c8af AV |
764 | extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
765 | unsigned int, void __user *); | |
e915e872 AV |
766 | extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, |
767 | struct scsi_ioctl_command __user *); | |
3fcfab16 | 768 | |
1aa4f24f JA |
769 | /* |
770 | * Temporary export, until SCSI gets fixed up. | |
771 | */ | |
3001ca77 N |
772 | extern int blk_rq_append_bio(struct request_queue *q, struct request *rq, |
773 | struct bio *bio); | |
1aa4f24f | 774 | |
3fcfab16 AM |
775 | /* |
776 | * A queue has just exitted congestion. Note this in the global counter of | |
777 | * congested queues, and wake up anyone who was waiting for requests to be | |
778 | * put back. | |
779 | */ | |
165125e1 | 780 | static inline void blk_clear_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
781 | { |
782 | clear_bdi_congested(&q->backing_dev_info, rw); | |
783 | } | |
784 | ||
785 | /* | |
786 | * A queue has just entered congestion. Flag that in the queue's VM-visible | |
787 | * state flags and increment the global gounter of congested queues. | |
788 | */ | |
165125e1 | 789 | static inline void blk_set_queue_congested(struct request_queue *q, int rw) |
3fcfab16 AM |
790 | { |
791 | set_bdi_congested(&q->backing_dev_info, rw); | |
792 | } | |
793 | ||
165125e1 JA |
794 | extern void blk_start_queue(struct request_queue *q); |
795 | extern void blk_stop_queue(struct request_queue *q); | |
1da177e4 | 796 | extern void blk_sync_queue(struct request_queue *q); |
165125e1 | 797 | extern void __blk_stop_queue(struct request_queue *q); |
75ad23bc | 798 | extern void __blk_run_queue(struct request_queue *); |
165125e1 | 799 | extern void blk_run_queue(struct request_queue *); |
a3bce90e | 800 | extern int blk_rq_map_user(struct request_queue *, struct request *, |
152e283f FT |
801 | struct rq_map_data *, void __user *, unsigned long, |
802 | gfp_t); | |
8e5cfc45 | 803 | extern int blk_rq_unmap_user(struct bio *); |
165125e1 JA |
804 | extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); |
805 | extern int blk_rq_map_user_iov(struct request_queue *, struct request *, | |
152e283f FT |
806 | struct rq_map_data *, struct sg_iovec *, int, |
807 | unsigned int, gfp_t); | |
165125e1 | 808 | extern int blk_execute_rq(struct request_queue *, struct gendisk *, |
994ca9a1 | 809 | struct request *, int); |
165125e1 | 810 | extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, |
15fc858a | 811 | struct request *, int, rq_end_io_fn *); |
2ad8b1ef | 812 | extern void blk_unplug(struct request_queue *q); |
6e39b69e | 813 | |
165125e1 | 814 | static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
1da177e4 LT |
815 | { |
816 | return bdev->bd_disk->queue; | |
817 | } | |
818 | ||
819 | static inline void blk_run_backing_dev(struct backing_dev_info *bdi, | |
820 | struct page *page) | |
821 | { | |
822 | if (bdi && bdi->unplug_io_fn) | |
823 | bdi->unplug_io_fn(bdi, page); | |
824 | } | |
825 | ||
826 | static inline void blk_run_address_space(struct address_space *mapping) | |
827 | { | |
828 | if (mapping) | |
829 | blk_run_backing_dev(mapping->backing_dev_info, NULL); | |
830 | } | |
831 | ||
53a08807 TH |
832 | extern void blkdev_dequeue_request(struct request *req); |
833 | ||
5efccd17 TH |
834 | /* |
835 | * blk_end_request() takes bytes instead of sectors as a complete size. | |
836 | * blk_rq_bytes() returns bytes left to complete in the entire request. | |
837 | * blk_rq_cur_bytes() returns bytes left to complete in the current segment. | |
838 | */ | |
839 | extern unsigned int blk_rq_bytes(struct request *rq); | |
840 | extern unsigned int blk_rq_cur_bytes(struct request *rq); | |
841 | ||
1da177e4 | 842 | /* |
2e60e022 TH |
843 | * Request completion related functions. |
844 | * | |
845 | * blk_update_request() completes given number of bytes and updates | |
846 | * the request without completing it. | |
847 | * | |
f06d9a2b TH |
848 | * blk_end_request() and friends. __blk_end_request() must be called |
849 | * with the request queue spinlock acquired. | |
1da177e4 LT |
850 | * |
851 | * Several drivers define their own end_request and call | |
3bcddeac KU |
852 | * blk_end_request() for parts of the original function. |
853 | * This prevents code duplication in drivers. | |
1da177e4 | 854 | */ |
2e60e022 TH |
855 | extern bool blk_update_request(struct request *rq, int error, |
856 | unsigned int nr_bytes); | |
857 | extern bool blk_end_bidi_request(struct request *rq, int error, | |
858 | unsigned int nr_bytes, | |
859 | unsigned int bidi_bytes); | |
860 | extern bool __blk_end_bidi_request(struct request *rq, int error, | |
861 | unsigned int nr_bytes, | |
862 | unsigned int bidi_bytes); | |
863 | ||
864 | /** | |
865 | * blk_end_request - Helper function for drivers to complete the request. | |
866 | * @rq: the request being processed | |
867 | * @error: %0 for success, < %0 for error | |
868 | * @nr_bytes: number of bytes to complete | |
869 | * | |
870 | * Description: | |
871 | * Ends I/O on a number of bytes attached to @rq. | |
872 | * If @rq has leftover, sets it up for the next range of segments. | |
873 | * | |
874 | * Return: | |
875 | * %false - we are done with this request | |
876 | * %true - still buffers pending for this request | |
877 | **/ | |
878 | static inline bool blk_end_request(struct request *rq, int error, | |
879 | unsigned int nr_bytes) | |
880 | { | |
881 | return blk_end_bidi_request(rq, error, nr_bytes, 0); | |
882 | } | |
883 | ||
40cbbb78 TH |
884 | /** |
885 | * blk_end_request_all - Helper function for drives to finish the request. | |
886 | * @rq: the request to finish | |
887 | * @err: %0 for success, < %0 for error | |
888 | * | |
889 | * Description: | |
890 | * Completely finish @rq. | |
891 | */ | |
892 | static inline void blk_end_request_all(struct request *rq, int error) | |
893 | { | |
894 | bool pending; | |
895 | ||
896 | pending = blk_end_request(rq, error, blk_rq_bytes(rq)); | |
897 | BUG_ON(pending); | |
898 | } | |
899 | ||
f06d9a2b TH |
900 | /** |
901 | * blk_end_request_cur - Helper function to finish the current request chunk. | |
902 | * @rq: the request to finish the current chunk for | |
903 | * @err: %0 for success, < %0 for error | |
904 | * | |
905 | * Description: | |
906 | * Complete the current consecutively mapped chunk from @rq. | |
907 | */ | |
908 | static inline void blk_end_request_cur(struct request *rq, int error) | |
909 | { | |
910 | blk_end_request(rq, error, rq->hard_cur_sectors << 9); | |
911 | } | |
912 | ||
2e60e022 TH |
913 | /** |
914 | * __blk_end_request - Helper function for drivers to complete the request. | |
915 | * @rq: the request being processed | |
916 | * @error: %0 for success, < %0 for error | |
917 | * @nr_bytes: number of bytes to complete | |
918 | * | |
919 | * Description: | |
920 | * Must be called with queue lock held unlike blk_end_request(). | |
921 | * | |
922 | * Return: | |
923 | * %false - we are done with this request | |
924 | * %true - still buffers pending for this request | |
925 | **/ | |
926 | static inline bool __blk_end_request(struct request *rq, int error, | |
927 | unsigned int nr_bytes) | |
928 | { | |
929 | return __blk_end_bidi_request(rq, error, nr_bytes, 0); | |
930 | } | |
931 | ||
40cbbb78 TH |
932 | /** |
933 | * __blk_end_request_all - Helper function for drives to finish the request. | |
934 | * @rq: the request to finish | |
935 | * @err: %0 for success, < %0 for error | |
936 | * | |
937 | * Description: | |
938 | * Completely finish @rq. Must be called with queue lock held. | |
939 | */ | |
940 | static inline void __blk_end_request_all(struct request *rq, int error) | |
941 | { | |
942 | bool pending; | |
943 | ||
944 | pending = __blk_end_request(rq, error, blk_rq_bytes(rq)); | |
945 | BUG_ON(pending); | |
946 | } | |
947 | ||
2e60e022 | 948 | /** |
f06d9a2b TH |
949 | * __blk_end_request_cur - Helper function to finish the current request chunk. |
950 | * @rq: the request to finish the current chunk for | |
951 | * @err: %0 for success, < %0 for error | |
2e60e022 TH |
952 | * |
953 | * Description: | |
f06d9a2b TH |
954 | * Complete the current consecutively mapped chunk from @rq. Must |
955 | * be called with queue lock held. | |
956 | */ | |
957 | static inline void __blk_end_request_cur(struct request *rq, int error) | |
2e60e022 | 958 | { |
f06d9a2b | 959 | __blk_end_request(rq, error, rq->hard_cur_sectors << 9); |
2e60e022 TH |
960 | } |
961 | ||
ff856bad | 962 | extern void blk_complete_request(struct request *); |
242f9dcb JA |
963 | extern void __blk_complete_request(struct request *); |
964 | extern void blk_abort_request(struct request *); | |
11914a53 | 965 | extern void blk_abort_queue(struct request_queue *); |
ff856bad | 966 | |
1da177e4 LT |
967 | /* |
968 | * Access functions for manipulating queue properties | |
969 | */ | |
165125e1 | 970 | extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, |
1946089a | 971 | spinlock_t *lock, int node_id); |
165125e1 JA |
972 | extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); |
973 | extern void blk_cleanup_queue(struct request_queue *); | |
974 | extern void blk_queue_make_request(struct request_queue *, make_request_fn *); | |
975 | extern void blk_queue_bounce_limit(struct request_queue *, u64); | |
976 | extern void blk_queue_max_sectors(struct request_queue *, unsigned int); | |
977 | extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); | |
978 | extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); | |
979 | extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); | |
980 | extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); | |
981 | extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); | |
e3790c7d | 982 | extern void blk_queue_dma_pad(struct request_queue *, unsigned int); |
27f8221a | 983 | extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); |
2fb98e84 TH |
984 | extern int blk_queue_dma_drain(struct request_queue *q, |
985 | dma_drain_needed_fn *dma_drain_needed, | |
986 | void *buf, unsigned int size); | |
ef9e3fac | 987 | extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); |
165125e1 JA |
988 | extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); |
989 | extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); | |
990 | extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); | |
991 | extern void blk_queue_dma_alignment(struct request_queue *, int); | |
11c3e689 | 992 | extern void blk_queue_update_dma_alignment(struct request_queue *, int); |
165125e1 | 993 | extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); |
fb2dce86 | 994 | extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); |
242f9dcb JA |
995 | extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); |
996 | extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); | |
1da177e4 | 997 | extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
165125e1 | 998 | extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
8f11b3e9 | 999 | extern bool blk_do_ordered(struct request_queue *, struct request **); |
165125e1 | 1000 | extern unsigned blk_ordered_cur_seq(struct request_queue *); |
797e7dbb | 1001 | extern unsigned blk_ordered_req_seq(struct request *); |
8f11b3e9 | 1002 | extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
1da177e4 | 1003 | |
165125e1 | 1004 | extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
1da177e4 | 1005 | extern void blk_dump_rq_flags(struct request *, char *); |
165125e1 | 1006 | extern void generic_unplug_device(struct request_queue *); |
1da177e4 | 1007 | extern long nr_blockdev_pages(void); |
1da177e4 | 1008 | |
165125e1 JA |
1009 | int blk_get_queue(struct request_queue *); |
1010 | struct request_queue *blk_alloc_queue(gfp_t); | |
1011 | struct request_queue *blk_alloc_queue_node(gfp_t, int); | |
1012 | extern void blk_put_queue(struct request_queue *); | |
1da177e4 LT |
1013 | |
1014 | /* | |
1015 | * tag stuff | |
1016 | */ | |
4aff5e23 | 1017 | #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
165125e1 JA |
1018 | extern int blk_queue_start_tag(struct request_queue *, struct request *); |
1019 | extern struct request *blk_queue_find_tag(struct request_queue *, int); | |
1020 | extern void blk_queue_end_tag(struct request_queue *, struct request *); | |
1021 | extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); | |
1022 | extern void blk_queue_free_tags(struct request_queue *); | |
1023 | extern int blk_queue_resize_tags(struct request_queue *, int); | |
1024 | extern void blk_queue_invalidate_tags(struct request_queue *); | |
492dfb48 JB |
1025 | extern struct blk_queue_tag *blk_init_tags(int); |
1026 | extern void blk_free_tags(struct blk_queue_tag *); | |
1da177e4 | 1027 | |
f583f492 DS |
1028 | static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, |
1029 | int tag) | |
1030 | { | |
1031 | if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) | |
1032 | return NULL; | |
1033 | return bqt->tag_index[tag]; | |
1034 | } | |
1035 | ||
1da177e4 | 1036 | extern int blkdev_issue_flush(struct block_device *, sector_t *); |
3e6053d7 HD |
1037 | extern int blkdev_issue_discard(struct block_device *, |
1038 | sector_t sector, sector_t nr_sects, gfp_t); | |
fb2dce86 DW |
1039 | |
1040 | static inline int sb_issue_discard(struct super_block *sb, | |
3e6053d7 | 1041 | sector_t block, sector_t nr_blocks) |
fb2dce86 DW |
1042 | { |
1043 | block <<= (sb->s_blocksize_bits - 9); | |
1044 | nr_blocks <<= (sb->s_blocksize_bits - 9); | |
3e6053d7 | 1045 | return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
fb2dce86 | 1046 | } |
1da177e4 | 1047 | |
0b07de85 AG |
1048 | /* |
1049 | * command filter functions | |
1050 | */ | |
4beab5c6 | 1051 | extern int blk_verify_command(struct blk_cmd_filter *filter, |
aeb5d727 AV |
1052 | unsigned char *cmd, fmode_t has_write_perm); |
1053 | extern void blk_unregister_filter(struct gendisk *disk); | |
4beab5c6 | 1054 | extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
0b07de85 | 1055 | |
1da177e4 LT |
1056 | #define MAX_PHYS_SEGMENTS 128 |
1057 | #define MAX_HW_SEGMENTS 128 | |
defd94b7 MC |
1058 | #define SAFE_MAX_SECTORS 255 |
1059 | #define BLK_DEF_MAX_SECTORS 1024 | |
1da177e4 LT |
1060 | |
1061 | #define MAX_SEGMENT_SIZE 65536 | |
1062 | ||
0e435ac2 MB |
1063 | #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL |
1064 | ||
1da177e4 LT |
1065 | #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
1066 | ||
165125e1 | 1067 | static inline int queue_hardsect_size(struct request_queue *q) |
1da177e4 LT |
1068 | { |
1069 | int retval = 512; | |
1070 | ||
1071 | if (q && q->hardsect_size) | |
1072 | retval = q->hardsect_size; | |
1073 | ||
1074 | return retval; | |
1075 | } | |
1076 | ||
1077 | static inline int bdev_hardsect_size(struct block_device *bdev) | |
1078 | { | |
1079 | return queue_hardsect_size(bdev_get_queue(bdev)); | |
1080 | } | |
1081 | ||
165125e1 | 1082 | static inline int queue_dma_alignment(struct request_queue *q) |
1da177e4 | 1083 | { |
482eb689 | 1084 | return q ? q->dma_alignment : 511; |
1da177e4 LT |
1085 | } |
1086 | ||
87904074 FT |
1087 | static inline int blk_rq_aligned(struct request_queue *q, void *addr, |
1088 | unsigned int len) | |
1089 | { | |
1090 | unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; | |
1091 | return !((unsigned long)addr & alignment) && !(len & alignment); | |
1092 | } | |
1093 | ||
1da177e4 LT |
1094 | /* assumes size > 256 */ |
1095 | static inline unsigned int blksize_bits(unsigned int size) | |
1096 | { | |
1097 | unsigned int bits = 8; | |
1098 | do { | |
1099 | bits++; | |
1100 | size >>= 1; | |
1101 | } while (size > 256); | |
1102 | return bits; | |
1103 | } | |
1104 | ||
2befb9e3 | 1105 | static inline unsigned int block_size(struct block_device *bdev) |
1da177e4 LT |
1106 | { |
1107 | return bdev->bd_block_size; | |
1108 | } | |
1109 | ||
1110 | typedef struct {struct page *v;} Sector; | |
1111 | ||
1112 | unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); | |
1113 | ||
1114 | static inline void put_dev_sector(Sector p) | |
1115 | { | |
1116 | page_cache_release(p.v); | |
1117 | } | |
1118 | ||
1119 | struct work_struct; | |
18887ad9 | 1120 | int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
1da177e4 | 1121 | |
1da177e4 LT |
1122 | #define MODULE_ALIAS_BLOCKDEV(major,minor) \ |
1123 | MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) | |
1124 | #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ | |
1125 | MODULE_ALIAS("block-major-" __stringify(major) "-*") | |
1126 | ||
7ba1ba12 MP |
1127 | #if defined(CONFIG_BLK_DEV_INTEGRITY) |
1128 | ||
b24498d4 JA |
1129 | #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
1130 | #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ | |
7ba1ba12 MP |
1131 | |
1132 | struct blk_integrity_exchg { | |
1133 | void *prot_buf; | |
1134 | void *data_buf; | |
1135 | sector_t sector; | |
1136 | unsigned int data_size; | |
1137 | unsigned short sector_size; | |
1138 | const char *disk_name; | |
1139 | }; | |
1140 | ||
1141 | typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); | |
1142 | typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); | |
1143 | typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); | |
1144 | typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); | |
1145 | ||
1146 | struct blk_integrity { | |
1147 | integrity_gen_fn *generate_fn; | |
1148 | integrity_vrfy_fn *verify_fn; | |
1149 | integrity_set_tag_fn *set_tag_fn; | |
1150 | integrity_get_tag_fn *get_tag_fn; | |
1151 | ||
1152 | unsigned short flags; | |
1153 | unsigned short tuple_size; | |
1154 | unsigned short sector_size; | |
1155 | unsigned short tag_size; | |
1156 | ||
1157 | const char *name; | |
1158 | ||
1159 | struct kobject kobj; | |
1160 | }; | |
1161 | ||
1162 | extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); | |
1163 | extern void blk_integrity_unregister(struct gendisk *); | |
ad7fce93 | 1164 | extern int blk_integrity_compare(struct gendisk *, struct gendisk *); |
7ba1ba12 MP |
1165 | extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); |
1166 | extern int blk_rq_count_integrity_sg(struct request *); | |
1167 | ||
b04accc4 JA |
1168 | static inline |
1169 | struct blk_integrity *bdev_get_integrity(struct block_device *bdev) | |
1170 | { | |
1171 | return bdev->bd_disk->integrity; | |
1172 | } | |
1173 | ||
b02739b0 MP |
1174 | static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
1175 | { | |
1176 | return disk->integrity; | |
1177 | } | |
1178 | ||
7ba1ba12 MP |
1179 | static inline int blk_integrity_rq(struct request *rq) |
1180 | { | |
d442cc44 MP |
1181 | if (rq->bio == NULL) |
1182 | return 0; | |
1183 | ||
7ba1ba12 MP |
1184 | return bio_integrity(rq->bio); |
1185 | } | |
1186 | ||
1187 | #else /* CONFIG_BLK_DEV_INTEGRITY */ | |
1188 | ||
1189 | #define blk_integrity_rq(rq) (0) | |
1190 | #define blk_rq_count_integrity_sg(a) (0) | |
1191 | #define blk_rq_map_integrity_sg(a, b) (0) | |
b04accc4 | 1192 | #define bdev_get_integrity(a) (0) |
b02739b0 | 1193 | #define blk_get_integrity(a) (0) |
7ba1ba12 MP |
1194 | #define blk_integrity_compare(a, b) (0) |
1195 | #define blk_integrity_register(a, b) (0) | |
1196 | #define blk_integrity_unregister(a) do { } while (0); | |
1197 | ||
1198 | #endif /* CONFIG_BLK_DEV_INTEGRITY */ | |
1199 | ||
08f85851 | 1200 | struct block_device_operations { |
d4430d62 AV |
1201 | int (*open) (struct block_device *, fmode_t); |
1202 | int (*release) (struct gendisk *, fmode_t); | |
1203 | int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1204 | int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
1205 | int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); | |
08f85851 AV |
1206 | int (*direct_access) (struct block_device *, sector_t, |
1207 | void **, unsigned long *); | |
1208 | int (*media_changed) (struct gendisk *); | |
1209 | int (*revalidate_disk) (struct gendisk *); | |
1210 | int (*getgeo)(struct block_device *, struct hd_geometry *); | |
1211 | struct module *owner; | |
1212 | }; | |
1213 | ||
633a08b8 AV |
1214 | extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
1215 | unsigned long); | |
9361401e DH |
1216 | #else /* CONFIG_BLOCK */ |
1217 | /* | |
1218 | * stubs for when the block layer is configured out | |
1219 | */ | |
1220 | #define buffer_heads_over_limit 0 | |
1221 | ||
9361401e DH |
1222 | static inline long nr_blockdev_pages(void) |
1223 | { | |
1224 | return 0; | |
1225 | } | |
1226 | ||
9361401e DH |
1227 | #endif /* CONFIG_BLOCK */ |
1228 | ||
1da177e4 | 1229 | #endif |