1 /****************************************************************************
2  ****************************************************************************
3  ***
4  ***   This header was automatically generated from a Linux kernel header
5  ***   of the same name, to make information necessary for userspace to
6  ***   call into the kernel available to libc.  It contains only constants,
7  ***   structures, and macros generated from the original header, and thus,
8  ***   contains no copyrightable information.
9  ***
10  ****************************************************************************
11  ****************************************************************************/
12 #ifndef _LINUX_BLKDEV_H
13 #define _LINUX_BLKDEV_H
14 
15 #include <linux/major.h>
16 #include <linux/genhd.h>
17 #include <linux/list.h>
18 #include <linux/timer.h>
19 #include <linux/workqueue.h>
20 #include <linux/pagemap.h>
21 #include <linux/backing-dev.h>
22 #include <linux/wait.h>
23 #include <linux/mempool.h>
24 #include <linux/bio.h>
25 #include <linux/module.h>
26 #include <linux/stringify.h>
27 
28 #include <asm/scatterlist.h>
29 
30 struct scsi_ioctl_command;
31 
32 struct request_queue;
33 typedef struct request_queue request_queue_t;
34 struct elevator_queue;
35 typedef struct elevator_queue elevator_t;
36 struct request_pm_state;
37 struct blk_trace;
38 
39 #define BLKDEV_MIN_RQ 4
40 #define BLKDEV_MAX_RQ 128
41 
42 struct as_io_context {
43  spinlock_t lock;
44 
45  void (*dtor)(struct as_io_context *aic);
46  void (*exit)(struct as_io_context *aic);
47 
48  unsigned long state;
49  atomic_t nr_queued;
50  atomic_t nr_dispatched;
51 
52  unsigned long last_end_request;
53  unsigned long ttime_total;
54  unsigned long ttime_samples;
55  unsigned long ttime_mean;
56 
57  unsigned int seek_samples;
58  sector_t last_request_pos;
59  u64 seek_total;
60  sector_t seek_mean;
61 };
62 
63 struct cfq_queue;
64 struct cfq_io_context {
65  struct rb_node rb_node;
66  void *key;
67 
68  struct cfq_queue *cfqq[2];
69 
70  struct io_context *ioc;
71 
72  unsigned long last_end_request;
73  sector_t last_request_pos;
74  unsigned long last_queue;
75 
76  unsigned long ttime_total;
77  unsigned long ttime_samples;
78  unsigned long ttime_mean;
79 
80  unsigned int seek_samples;
81  u64 seek_total;
82  sector_t seek_mean;
83 
84  struct list_head queue_list;
85 
86  void (*dtor)(struct io_context *);
87  void (*exit)(struct io_context *);
88 };
89 
90 struct io_context {
91  atomic_t refcount;
92  struct task_struct *task;
93 
94  int (*set_ioprio)(struct io_context *, unsigned int);
95 
96  unsigned long last_waited;
97  int nr_batch_requests;
98 
99  struct as_io_context *aic;
100  struct rb_root cic_root;
101 };
102 
103 struct io_context *current_io_context(gfp_t gfp_flags);
104 struct io_context *get_io_context(gfp_t gfp_flags);
105 
106 struct request;
107 typedef void (rq_end_io_fn)(struct request *, int);
108 
109 struct request_list {
110  int count[2];
111  int starved[2];
112  int elvpriv;
113  mempool_t *rq_pool;
114  wait_queue_head_t wait[2];
115 };
116 
117 #define BLK_MAX_CDB 16
118 
119 struct request {
120  struct list_head queuelist;
121  struct list_head donelist;
122 
123  unsigned long flags;
124 
125  sector_t sector;
126  unsigned long nr_sectors;
127 
128  unsigned int current_nr_sectors;
129 
130  sector_t hard_sector;
131  unsigned long hard_nr_sectors;
132 
133  unsigned int hard_cur_sectors;
134 
135  struct bio *bio;
136  struct bio *biotail;
137 
138  void *elevator_private;
139  void *completion_data;
140 
141  int rq_status;
142  int errors;
143  struct gendisk *rq_disk;
144  unsigned long start_time;
145 
146  unsigned short nr_phys_segments;
147 
148  unsigned short nr_hw_segments;
149 
150  unsigned short ioprio;
151 
152  int tag;
153 
154  int ref_count;
155  request_queue_t *q;
156  struct request_list *rl;
157 
158  struct completion *waiting;
159  void *special;
160  char *buffer;
161 
162  unsigned int cmd_len;
163  unsigned char cmd[BLK_MAX_CDB];
164 
165  unsigned int data_len;
166  unsigned int sense_len;
167  void *data;
168  void *sense;
169 
170  unsigned int timeout;
171  int retries;
172 
173  rq_end_io_fn *end_io;
174  void *end_io_data;
175 };
176 
177 enum rq_flag_bits {
178  __REQ_RW,
179  __REQ_FAILFAST,
180  __REQ_SORTED,
181  __REQ_SOFTBARRIER,
182  __REQ_HARDBARRIER,
183  __REQ_FUA,
184  __REQ_CMD,
185  __REQ_NOMERGE,
186  __REQ_STARTED,
187  __REQ_DONTPREP,
188  __REQ_QUEUED,
189  __REQ_ELVPRIV,
190 
191  __REQ_PC,
192  __REQ_BLOCK_PC,
193  __REQ_SENSE,
194 
195  __REQ_FAILED,
196  __REQ_QUIET,
197  __REQ_SPECIAL,
198  __REQ_DRIVE_CMD,
199  __REQ_DRIVE_TASK,
200  __REQ_DRIVE_TASKFILE,
201  __REQ_PREEMPT,
202  __REQ_PM_SUSPEND,
203  __REQ_PM_RESUME,
204  __REQ_PM_SHUTDOWN,
205  __REQ_ORDERED_COLOR,
206  __REQ_RW_SYNC,
207  __REQ_NR_BITS,
208 };
209 
210 #define REQ_RW (1 << __REQ_RW)
211 #define REQ_FAILFAST (1 << __REQ_FAILFAST)
212 #define REQ_SORTED (1 << __REQ_SORTED)
213 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
214 #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
215 #define REQ_FUA (1 << __REQ_FUA)
216 #define REQ_CMD (1 << __REQ_CMD)
217 #define REQ_NOMERGE (1 << __REQ_NOMERGE)
218 #define REQ_STARTED (1 << __REQ_STARTED)
219 #define REQ_DONTPREP (1 << __REQ_DONTPREP)
220 #define REQ_QUEUED (1 << __REQ_QUEUED)
221 #define REQ_ELVPRIV (1 << __REQ_ELVPRIV)
222 #define REQ_PC (1 << __REQ_PC)
223 #define REQ_BLOCK_PC (1 << __REQ_BLOCK_PC)
224 #define REQ_SENSE (1 << __REQ_SENSE)
225 #define REQ_FAILED (1 << __REQ_FAILED)
226 #define REQ_QUIET (1 << __REQ_QUIET)
227 #define REQ_SPECIAL (1 << __REQ_SPECIAL)
228 #define REQ_DRIVE_CMD (1 << __REQ_DRIVE_CMD)
229 #define REQ_DRIVE_TASK (1 << __REQ_DRIVE_TASK)
230 #define REQ_DRIVE_TASKFILE (1 << __REQ_DRIVE_TASKFILE)
231 #define REQ_PREEMPT (1 << __REQ_PREEMPT)
232 #define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND)
233 #define REQ_PM_RESUME (1 << __REQ_PM_RESUME)
234 #define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN)
235 #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR)
236 #define REQ_RW_SYNC (1 << __REQ_RW_SYNC)
237 
238 struct request_pm_state
239 {
240 
241  int pm_step;
242 
243  u32 pm_state;
244  void* data;
245 };
246 
247 #include <linux/elevator.h>
248 
249 typedef int (merge_request_fn) (request_queue_t *, struct request *,
250  struct bio *);
251 typedef int (merge_requests_fn) (request_queue_t *, struct request *,
252  struct request *);
253 typedef void (request_fn_proc) (request_queue_t *q);
254 typedef int (make_request_fn) (request_queue_t *q, struct bio *bio);
255 typedef int (prep_rq_fn) (request_queue_t *, struct request *);
256 typedef void (unplug_fn) (request_queue_t *);
257 
258 struct bio_vec;
259 typedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *);
260 typedef void (activity_fn) (void *data, int rw);
261 typedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *);
262 typedef void (prepare_flush_fn) (request_queue_t *, struct request *);
263 typedef void (softirq_done_fn)(struct request *);
264 
265 enum blk_queue_state {
266  Queue_down,
267  Queue_up,
268 };
269 
270 struct blk_queue_tag {
271  struct request **tag_index;
272  unsigned long *tag_map;
273  struct list_head busy_list;
274  int busy;
275  int max_depth;
276  int real_max_depth;
277  atomic_t refcnt;
278 };
279 
280 struct request_queue
281 {
282 
283  struct list_head queue_head;
284  struct request *last_merge;
285  elevator_t *elevator;
286 
287  struct request_list rq;
288 
289  request_fn_proc *request_fn;
290  merge_request_fn *back_merge_fn;
291  merge_request_fn *front_merge_fn;
292  merge_requests_fn *merge_requests_fn;
293  make_request_fn *make_request_fn;
294  prep_rq_fn *prep_rq_fn;
295  unplug_fn *unplug_fn;
296  merge_bvec_fn *merge_bvec_fn;
297  activity_fn *activity_fn;
298  issue_flush_fn *issue_flush_fn;
299  prepare_flush_fn *prepare_flush_fn;
300  softirq_done_fn *softirq_done_fn;
301 
302  sector_t end_sector;
303  struct request *boundary_rq;
304 
305  struct timer_list unplug_timer;
306  int unplug_thresh;
307  unsigned long unplug_delay;
308  struct work_struct unplug_work;
309 
310  struct backing_dev_info backing_dev_info;
311 
312  void *queuedata;
313 
314  void *activity_data;
315 
316  unsigned long bounce_pfn;
317  gfp_t bounce_gfp;
318 
319  unsigned long queue_flags;
320 
321  spinlock_t __queue_lock;
322  spinlock_t *queue_lock;
323 
324  struct kobject kobj;
325 
326  unsigned long nr_requests;
327  unsigned int nr_congestion_on;
328  unsigned int nr_congestion_off;
329  unsigned int nr_batching;
330 
331  unsigned int max_sectors;
332  unsigned int max_hw_sectors;
333  unsigned short max_phys_segments;
334  unsigned short max_hw_segments;
335  unsigned short hardsect_size;
336  unsigned int max_segment_size;
337 
338  unsigned long seg_boundary_mask;
339  unsigned int dma_alignment;
340 
341  struct blk_queue_tag *queue_tags;
342 
343  unsigned int nr_sorted;
344  unsigned int in_flight;
345 
346  unsigned int sg_timeout;
347  unsigned int sg_reserved_size;
348  int node;
349 
350  struct blk_trace *blk_trace;
351 
352  unsigned int ordered, next_ordered, ordseq;
353  int orderr, ordcolor;
354  struct request pre_flush_rq, bar_rq, post_flush_rq;
355  struct request *orig_bar_rq;
356  unsigned int bi_size;
357 
358  struct mutex sysfs_lock;
359 };
360 
361 #define RQ_INACTIVE (-1)
362 #define RQ_ACTIVE 1
363 
364 #define QUEUE_FLAG_CLUSTER 0
365 #define QUEUE_FLAG_QUEUED 1
366 #define QUEUE_FLAG_STOPPED 2
367 #define QUEUE_FLAG_READFULL 3
368 #define QUEUE_FLAG_WRITEFULL 4
369 #define QUEUE_FLAG_DEAD 5
370 #define QUEUE_FLAG_REENTER 6
371 #define QUEUE_FLAG_PLUGGED 7
372 #define QUEUE_FLAG_ELVSWITCH 8
373 
374 enum {
375 
376  QUEUE_ORDERED_NONE = 0x00,
377  QUEUE_ORDERED_DRAIN = 0x01,
378  QUEUE_ORDERED_TAG = 0x02,
379 
380  QUEUE_ORDERED_PREFLUSH = 0x10,
381  QUEUE_ORDERED_POSTFLUSH = 0x20,
382  QUEUE_ORDERED_FUA = 0x40,
383 
384  QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
385  QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
386  QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN |
387  QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
388  QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
389  QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH,
390  QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG |
391  QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA,
392 
393  QUEUE_ORDSEQ_STARTED = 0x01,
394  QUEUE_ORDSEQ_DRAIN = 0x02,
395  QUEUE_ORDSEQ_PREFLUSH = 0x04,
396  QUEUE_ORDSEQ_BAR = 0x08,
397  QUEUE_ORDSEQ_POSTFLUSH = 0x10,
398  QUEUE_ORDSEQ_DONE = 0x20,
399 };
400 
401 #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags)
402 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
403 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
404 #define blk_queue_flushing(q) ((q)->ordseq)
405 
406 #define blk_fs_request(rq) ((rq)->flags & REQ_CMD)
407 #define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC)
408 #define blk_noretry_request(rq) ((rq)->flags & REQ_FAILFAST)
409 #define blk_rq_started(rq) ((rq)->flags & REQ_STARTED)
410 
411 #define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq))
412 
413 #define blk_pm_suspend_request(rq) ((rq)->flags & REQ_PM_SUSPEND)
414 #define blk_pm_resume_request(rq) ((rq)->flags & REQ_PM_RESUME)
415 #define blk_pm_request(rq)   ((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME))
416 
417 #define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED)
418 #define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER)
419 #define blk_fua_rq(rq) ((rq)->flags & REQ_FUA)
420 
421 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
422 
423 #define rq_data_dir(rq) ((rq)->flags & 1)
424 
425 #define RQ_NOMERGE_FLAGS   (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
426 #define rq_mergeable(rq)   (!((rq)->flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq)))
427 #define blk_queue_headactive(q, head_active)
428 #define BLKPREP_OK 0
429 #define BLKPREP_KILL 1
430 #define BLKPREP_DEFER 2
431 
432 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
433 #define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
434 #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
435 
436 #define rq_for_each_bio(_bio, rq)   if ((rq->bio))   for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
437 
438 #define end_io_error(uptodate) (unlikely((uptodate) <= 0))
439 
440 #define blk_queue_tag_depth(q) ((q)->queue_tags->busy)
441 #define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth)
442 #define blk_rq_tagged(rq) ((rq)->flags & REQ_QUEUED)
443 
444 #define MAX_PHYS_SEGMENTS 128
445 #define MAX_HW_SEGMENTS 128
446 #define SAFE_MAX_SECTORS 255
447 #define BLK_DEF_MAX_SECTORS 1024
448 
449 #define MAX_SEGMENT_SIZE 65536
450 
451 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
452 
453 #define blk_finished_io(nsects) do { } while (0)
454 #define blk_started_io(nsects) do { } while (0)
455 
456 #define sector_div(n, b)(  {   int _res;   _res = (n) % (b);   (n) /= (b);   _res;  }  )
457 
458 #define MODULE_ALIAS_BLOCKDEV(major,minor)   MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
459 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major)   MODULE_ALIAS("block-major-" __stringify(major) "-*")
460 
461 #endif
462