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