1 #ifndef _LINUX_BLKDEV_H 2 #define _LINUX_BLKDEV_H 3 4 #ifdef CONFIG_BLOCK 5 6 #include <linux/sched.h> 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> 19 #include <linux/gfp.h> 20 #include <linux/bsg.h> 21 #include <linux/smp.h> 22 23 #include <asm/scatterlist.h> 24 25 struct scsi_ioctl_command; 26 27 struct request_queue; 28 struct elevator_queue; 29 struct request_pm_state; 30 struct blk_trace; 31 struct request; 32 struct sg_io_hdr; 33 34 #define BLKDEV_MIN_RQ 4 35 #define BLKDEV_MAX_RQ 128 /* Default maximum */ 36 37 struct request; 38 typedef void (rq_end_io_fn)(struct request *, int); 39 40 struct request_list { 41 /* 42 * count[], starved[], and wait[] are indexed by 43 * BLK_RW_SYNC/BLK_RW_ASYNC 44 */ 45 int count[2]; 46 int starved[2]; 47 int elvpriv; 48 mempool_t *rq_pool; 49 wait_queue_head_t wait[2]; 50 }; 51 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 */ 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 */ 69 REQ_TYPE_ATA_TASKFILE, 70 REQ_TYPE_ATA_PC, 71 }; 72 73 /* 74 * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being 75 * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a 76 * SCSI cdb. 77 * 78 * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, 79 * typically to differentiate REQ_TYPE_SPECIAL requests. 80 * 81 */ 82 enum { 83 REQ_LB_OP_EJECT = 0x40, /* eject request */ 84 REQ_LB_OP_FLUSH = 0x41, /* flush request */ 85 REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ 86 }; 87 88 /* 89 * request type modified bits. first four bits match BIO_RW* bits, important 90 */ 91 enum rq_flag_bits { 92 __REQ_RW, /* not set, read. set, write */ 93 __REQ_FAILFAST_DEV, /* no driver retries of device errors */ 94 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ 95 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ 96 /* above flags must match BIO_RW_* */ 97 __REQ_DISCARD, /* request to discard sectors */ 98 __REQ_SORTED, /* elevator knows about this request */ 99 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ 100 __REQ_HARDBARRIER, /* may not be passed by drive either */ 101 __REQ_FUA, /* forced unit access */ 102 __REQ_NOMERGE, /* don't touch this for merging */ 103 __REQ_STARTED, /* drive already may have started this one */ 104 __REQ_DONTPREP, /* don't call prep for this one */ 105 __REQ_QUEUED, /* uses queueing */ 106 __REQ_ELVPRIV, /* elevator private data attached */ 107 __REQ_FAILED, /* set if the request failed */ 108 __REQ_QUIET, /* don't worry about errors */ 109 __REQ_PREEMPT, /* set for "ide_preempt" requests */ 110 __REQ_ORDERED_COLOR, /* is before or after barrier */ 111 __REQ_RW_SYNC, /* request is sync (sync write or read) */ 112 __REQ_ALLOCED, /* request came from our alloc pool */ 113 __REQ_RW_META, /* metadata io request */ 114 __REQ_COPY_USER, /* contains copies of user pages */ 115 __REQ_INTEGRITY, /* integrity metadata has been remapped */ 116 __REQ_NOIDLE, /* Don't anticipate more IO after this one */ 117 __REQ_IO_STAT, /* account I/O stat */ 118 __REQ_MIXED_MERGE, /* merge of different types, fail separately */ 119 __REQ_NR_BITS, /* stops here */ 120 }; 121 122 #define REQ_RW (1 << __REQ_RW) 123 #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) 124 #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) 125 #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) 126 #define REQ_DISCARD (1 << __REQ_DISCARD) 127 #define REQ_SORTED (1 << __REQ_SORTED) 128 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) 129 #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) 130 #define REQ_FUA (1 << __REQ_FUA) 131 #define REQ_NOMERGE (1 << __REQ_NOMERGE) 132 #define REQ_STARTED (1 << __REQ_STARTED) 133 #define REQ_DONTPREP (1 << __REQ_DONTPREP) 134 #define REQ_QUEUED (1 << __REQ_QUEUED) 135 #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) 136 #define REQ_FAILED (1 << __REQ_FAILED) 137 #define REQ_QUIET (1 << __REQ_QUIET) 138 #define REQ_PREEMPT (1 << __REQ_PREEMPT) 139 #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) 140 #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) 141 #define REQ_ALLOCED (1 << __REQ_ALLOCED) 142 #define REQ_RW_META (1 << __REQ_RW_META) 143 #define REQ_COPY_USER (1 << __REQ_COPY_USER) 144 #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) 145 #define REQ_NOIDLE (1 << __REQ_NOIDLE) 146 #define REQ_IO_STAT (1 << __REQ_IO_STAT) 147 #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) 148 149 #define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \ 150 REQ_FAILFAST_DRIVER) 151 152 #define BLK_MAX_CDB 16 153 154 /* 155 * try to put the fields that are referenced together in the same cacheline. 156 * if you modify this structure, be sure to check block/blk-core.c:rq_init() 157 * as well! 158 */ 159 struct request { 160 struct list_head queuelist; 161 struct call_single_data csd; 162 int cpu; 163 164 struct request_queue *q; 165 166 unsigned int cmd_flags; 167 enum rq_cmd_type_bits cmd_type; 168 unsigned long atomic_flags; 169 170 /* the following two fields are internal, NEVER access directly */ 171 sector_t __sector; /* sector cursor */ 172 unsigned int __data_len; /* total data len */ 173 174 struct bio *bio; 175 struct bio *biotail; 176 177 struct hlist_node hash; /* merge hash */ 178 /* 179 * The rb_node is only used inside the io scheduler, requests 180 * are pruned when moved to the dispatch queue. So let the 181 * completion_data share space with the rb_node. 182 */ 183 union { 184 struct rb_node rb_node; /* sort/lookup */ 185 void *completion_data; 186 }; 187 188 /* 189 * two pointers are available for the IO schedulers, if they need 190 * more they have to dynamically allocate it. 191 */ 192 void *elevator_private; 193 void *elevator_private2; 194 195 struct gendisk *rq_disk; 196 unsigned long start_time; 197 198 /* Number of scatter-gather DMA addr+len pairs after 199 * physical address coalescing is performed. 200 */ 201 unsigned short nr_phys_segments; 202 203 unsigned short ioprio; 204 205 void *special; /* opaque pointer available for LLD use */ 206 char *buffer; /* kaddr of the current segment if available */ 207 208 int tag; 209 int errors; 210 211 int ref_count; 212 213 /* 214 * when request is used as a packet command carrier 215 */ 216 unsigned short cmd_len; 217 unsigned char __cmd[BLK_MAX_CDB]; 218 unsigned char *cmd; 219 220 unsigned int extra_len; /* length of alignment and padding */ 221 unsigned int sense_len; 222 unsigned int resid_len; /* residual count */ 223 void *sense; 224 225 unsigned long deadline; 226 struct list_head timeout_list; 227 unsigned int timeout; 228 int retries; 229 230 /* 231 * completion callback. 232 */ 233 rq_end_io_fn *end_io; 234 void *end_io_data; 235 236 /* for bidi */ 237 struct request *next_rq; 238 }; 239 240 static inline unsigned short req_get_ioprio(struct request *req) 241 { 242 return req->ioprio; 243 } 244 245 /* 246 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME 247 * requests. Some step values could eventually be made generic. 248 */ 249 struct request_pm_state 250 { 251 /* PM state machine step value, currently driver specific */ 252 int pm_step; 253 /* requested PM state value (S1, S2, S3, S4, ...) */ 254 u32 pm_state; 255 void* data; /* for driver use */ 256 }; 257 258 #include <linux/elevator.h> 259 260 typedef void (request_fn_proc) (struct request_queue *q); 261 typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); 262 typedef int (prep_rq_fn) (struct request_queue *, struct request *); 263 typedef void (unplug_fn) (struct request_queue *); 264 typedef int (prepare_discard_fn) (struct request_queue *, struct request *); 265 266 struct bio_vec; 267 struct bvec_merge_data { 268 struct block_device *bi_bdev; 269 sector_t bi_sector; 270 unsigned bi_size; 271 unsigned long bi_rw; 272 }; 273 typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, 274 struct bio_vec *); 275 typedef void (prepare_flush_fn) (struct request_queue *, struct request *); 276 typedef void (softirq_done_fn)(struct request *); 277 typedef int (dma_drain_needed_fn)(struct request *); 278 typedef int (lld_busy_fn) (struct request_queue *q); 279 280 enum blk_eh_timer_return { 281 BLK_EH_NOT_HANDLED, 282 BLK_EH_HANDLED, 283 BLK_EH_RESET_TIMER, 284 }; 285 286 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); 287 288 enum blk_queue_state { 289 Queue_down, 290 Queue_up, 291 }; 292 293 struct blk_queue_tag { 294 struct request **tag_index; /* map of busy tags */ 295 unsigned long *tag_map; /* bit map of free/busy tags */ 296 int busy; /* current depth */ 297 int max_depth; /* what we will send to device */ 298 int real_max_depth; /* what the array can hold */ 299 atomic_t refcnt; /* map can be shared */ 300 }; 301 302 #define BLK_SCSI_MAX_CMDS (256) 303 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 304 305 struct queue_limits { 306 unsigned long bounce_pfn; 307 unsigned long seg_boundary_mask; 308 309 unsigned int max_hw_sectors; 310 unsigned int max_sectors; 311 unsigned int max_segment_size; 312 unsigned int physical_block_size; 313 unsigned int alignment_offset; 314 unsigned int io_min; 315 unsigned int io_opt; 316 317 unsigned short logical_block_size; 318 unsigned short max_hw_segments; 319 unsigned short max_phys_segments; 320 321 unsigned char misaligned; 322 unsigned char no_cluster; 323 }; 324 325 struct request_queue 326 { 327 /* 328 * Together with queue_head for cacheline sharing 329 */ 330 struct list_head queue_head; 331 struct request *last_merge; 332 struct elevator_queue *elevator; 333 334 /* 335 * the queue request freelist, one for reads and one for writes 336 */ 337 struct request_list rq; 338 339 request_fn_proc *request_fn; 340 make_request_fn *make_request_fn; 341 prep_rq_fn *prep_rq_fn; 342 unplug_fn *unplug_fn; 343 prepare_discard_fn *prepare_discard_fn; 344 merge_bvec_fn *merge_bvec_fn; 345 prepare_flush_fn *prepare_flush_fn; 346 softirq_done_fn *softirq_done_fn; 347 rq_timed_out_fn *rq_timed_out_fn; 348 dma_drain_needed_fn *dma_drain_needed; 349 lld_busy_fn *lld_busy_fn; 350 351 /* 352 * Dispatch queue sorting 353 */ 354 sector_t end_sector; 355 struct request *boundary_rq; 356 357 /* 358 * Auto-unplugging state 359 */ 360 struct timer_list unplug_timer; 361 int unplug_thresh; /* After this many requests */ 362 unsigned long unplug_delay; /* After this many jiffies */ 363 struct work_struct unplug_work; 364 365 struct backing_dev_info backing_dev_info; 366 367 /* 368 * The queue owner gets to use this for whatever they like. 369 * ll_rw_blk doesn't touch it. 370 */ 371 void *queuedata; 372 373 /* 374 * queue needs bounce pages for pages above this limit 375 */ 376 gfp_t bounce_gfp; 377 378 /* 379 * various queue flags, see QUEUE_* below 380 */ 381 unsigned long queue_flags; 382 383 /* 384 * protects queue structures from reentrancy. ->__queue_lock should 385 * _never_ be used directly, it is queue private. always use 386 * ->queue_lock. 387 */ 388 spinlock_t __queue_lock; 389 spinlock_t *queue_lock; 390 391 /* 392 * queue kobject 393 */ 394 struct kobject kobj; 395 396 /* 397 * queue settings 398 */ 399 unsigned long nr_requests; /* Max # of requests */ 400 unsigned int nr_congestion_on; 401 unsigned int nr_congestion_off; 402 unsigned int nr_batching; 403 404 void *dma_drain_buffer; 405 unsigned int dma_drain_size; 406 unsigned int dma_pad_mask; 407 unsigned int dma_alignment; 408 409 struct blk_queue_tag *queue_tags; 410 struct list_head tag_busy_list; 411 412 unsigned int nr_sorted; 413 unsigned int in_flight[2]; 414 415 unsigned int rq_timeout; 416 struct timer_list timeout; 417 struct list_head timeout_list; 418 419 struct queue_limits limits; 420 421 /* 422 * sg stuff 423 */ 424 unsigned int sg_timeout; 425 unsigned int sg_reserved_size; 426 int node; 427 #ifdef CONFIG_BLK_DEV_IO_TRACE 428 struct blk_trace *blk_trace; 429 #endif 430 /* 431 * reserved for flush operations 432 */ 433 unsigned int ordered, next_ordered, ordseq; 434 int orderr, ordcolor; 435 struct request pre_flush_rq, bar_rq, post_flush_rq; 436 struct request *orig_bar_rq; 437 438 struct mutex sysfs_lock; 439 440 #if defined(CONFIG_BLK_DEV_BSG) 441 struct bsg_class_device bsg_dev; 442 #endif 443 }; 444 445 #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ 446 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ 447 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ 448 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ 449 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ 450 #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ 451 #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ 452 #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ 453 #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ 454 #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ 455 #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ 456 #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ 457 #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ 458 #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ 459 #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ 460 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 461 #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ 462 #define QUEUE_FLAG_CQ 16 /* hardware does queuing */ 463 464 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 465 (1 << QUEUE_FLAG_CLUSTER) | \ 466 (1 << QUEUE_FLAG_STACKABLE) | \ 467 (1 << QUEUE_FLAG_SAME_COMP)) 468 469 static inline int queue_is_locked(struct request_queue *q) 470 { 471 #ifdef CONFIG_SMP 472 spinlock_t *lock = q->queue_lock; 473 return lock && spin_is_locked(lock); 474 #else 475 return 1; 476 #endif 477 } 478 479 static inline void queue_flag_set_unlocked(unsigned int flag, 480 struct request_queue *q) 481 { 482 __set_bit(flag, &q->queue_flags); 483 } 484 485 static inline int queue_flag_test_and_clear(unsigned int flag, 486 struct request_queue *q) 487 { 488 WARN_ON_ONCE(!queue_is_locked(q)); 489 490 if (test_bit(flag, &q->queue_flags)) { 491 __clear_bit(flag, &q->queue_flags); 492 return 1; 493 } 494 495 return 0; 496 } 497 498 static inline int queue_flag_test_and_set(unsigned int flag, 499 struct request_queue *q) 500 { 501 WARN_ON_ONCE(!queue_is_locked(q)); 502 503 if (!test_bit(flag, &q->queue_flags)) { 504 __set_bit(flag, &q->queue_flags); 505 return 0; 506 } 507 508 return 1; 509 } 510 511 static inline void queue_flag_set(unsigned int flag, struct request_queue *q) 512 { 513 WARN_ON_ONCE(!queue_is_locked(q)); 514 __set_bit(flag, &q->queue_flags); 515 } 516 517 static inline void queue_flag_clear_unlocked(unsigned int flag, 518 struct request_queue *q) 519 { 520 __clear_bit(flag, &q->queue_flags); 521 } 522 523 static inline int queue_in_flight(struct request_queue *q) 524 { 525 return q->in_flight[0] + q->in_flight[1]; 526 } 527 528 static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) 529 { 530 WARN_ON_ONCE(!queue_is_locked(q)); 531 __clear_bit(flag, &q->queue_flags); 532 } 533 534 enum { 535 /* 536 * Hardbarrier is supported with one of the following methods. 537 * 538 * NONE : hardbarrier unsupported 539 * DRAIN : ordering by draining is enough 540 * DRAIN_FLUSH : ordering by draining w/ pre and post flushes 541 * DRAIN_FUA : ordering by draining w/ pre flush and FUA write 542 * TAG : ordering by tag is enough 543 * TAG_FLUSH : ordering by tag w/ pre and post flushes 544 * TAG_FUA : ordering by tag w/ pre flush and FUA write 545 */ 546 QUEUE_ORDERED_BY_DRAIN = 0x01, 547 QUEUE_ORDERED_BY_TAG = 0x02, 548 QUEUE_ORDERED_DO_PREFLUSH = 0x10, 549 QUEUE_ORDERED_DO_BAR = 0x20, 550 QUEUE_ORDERED_DO_POSTFLUSH = 0x40, 551 QUEUE_ORDERED_DO_FUA = 0x80, 552 553 QUEUE_ORDERED_NONE = 0x00, 554 555 QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | 556 QUEUE_ORDERED_DO_BAR, 557 QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | 558 QUEUE_ORDERED_DO_PREFLUSH | 559 QUEUE_ORDERED_DO_POSTFLUSH, 560 QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | 561 QUEUE_ORDERED_DO_PREFLUSH | 562 QUEUE_ORDERED_DO_FUA, 563 564 QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | 565 QUEUE_ORDERED_DO_BAR, 566 QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | 567 QUEUE_ORDERED_DO_PREFLUSH | 568 QUEUE_ORDERED_DO_POSTFLUSH, 569 QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | 570 QUEUE_ORDERED_DO_PREFLUSH | 571 QUEUE_ORDERED_DO_FUA, 572 573 /* 574 * Ordered operation sequence 575 */ 576 QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ 577 QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ 578 QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ 579 QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ 580 QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ 581 QUEUE_ORDSEQ_DONE = 0x20, 582 }; 583 584 #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) 585 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) 586 #define blk_queue_queuing(q) test_bit(QUEUE_FLAG_CQ, &(q)->queue_flags) 587 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 588 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 589 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 590 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 591 #define blk_queue_flushing(q) ((q)->ordseq) 592 #define blk_queue_stackable(q) \ 593 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) 594 595 #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) 596 #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) 597 #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) 598 #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) 599 600 #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) 601 #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) 602 #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) 603 #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ 604 blk_failfast_transport(rq) || \ 605 blk_failfast_driver(rq)) 606 #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) 607 #define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT) 608 #define blk_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET) 609 610 #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) 611 612 #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) 613 #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) 614 #define blk_pm_request(rq) \ 615 (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) 616 617 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) 618 #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) 619 #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) 620 #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) 621 #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) 622 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) 623 /* rq->queuelist of dequeued request must be list_empty() */ 624 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) 625 626 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 627 628 #define rq_data_dir(rq) ((rq)->cmd_flags & 1) 629 630 /* 631 * We regard a request as sync, if either a read or a sync write 632 */ 633 static inline bool rw_is_sync(unsigned int rw_flags) 634 { 635 return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC); 636 } 637 638 static inline bool rq_is_sync(struct request *rq) 639 { 640 return rw_is_sync(rq->cmd_flags); 641 } 642 643 #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) 644 #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) 645 646 static inline int blk_queue_full(struct request_queue *q, int sync) 647 { 648 if (sync) 649 return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); 650 return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); 651 } 652 653 static inline void blk_set_queue_full(struct request_queue *q, int sync) 654 { 655 if (sync) 656 queue_flag_set(QUEUE_FLAG_SYNCFULL, q); 657 else 658 queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); 659 } 660 661 static inline void blk_clear_queue_full(struct request_queue *q, int sync) 662 { 663 if (sync) 664 queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); 665 else 666 queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); 667 } 668 669 670 /* 671 * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may 672 * it already be started by driver. 673 */ 674 #define RQ_NOMERGE_FLAGS \ 675 (REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER) 676 #define rq_mergeable(rq) \ 677 (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ 678 (blk_discard_rq(rq) || blk_fs_request((rq)))) 679 680 /* 681 * q->prep_rq_fn return values 682 */ 683 #define BLKPREP_OK 0 /* serve it */ 684 #define BLKPREP_KILL 1 /* fatal error, kill */ 685 #define BLKPREP_DEFER 2 /* leave on queue */ 686 687 extern unsigned long blk_max_low_pfn, blk_max_pfn; 688 689 /* 690 * standard bounce addresses: 691 * 692 * BLK_BOUNCE_HIGH : bounce all highmem pages 693 * BLK_BOUNCE_ANY : don't bounce anything 694 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 695 */ 696 697 #if BITS_PER_LONG == 32 698 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 699 #else 700 #define BLK_BOUNCE_HIGH -1ULL 701 #endif 702 #define BLK_BOUNCE_ANY (-1ULL) 703 #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) 704 705 /* 706 * default timeout for SG_IO if none specified 707 */ 708 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 709 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 710 711 #ifdef CONFIG_BOUNCE 712 extern int init_emergency_isa_pool(void); 713 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); 714 #else 715 static inline int init_emergency_isa_pool(void) 716 { 717 return 0; 718 } 719 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) 720 { 721 } 722 #endif /* CONFIG_MMU */ 723 724 struct rq_map_data { 725 struct page **pages; 726 int page_order; 727 int nr_entries; 728 unsigned long offset; 729 int null_mapped; 730 int from_user; 731 }; 732 733 struct req_iterator { 734 int i; 735 struct bio *bio; 736 }; 737 738 /* This should not be used directly - use rq_for_each_segment */ 739 #define for_each_bio(_bio) \ 740 for (; _bio; _bio = _bio->bi_next) 741 #define __rq_for_each_bio(_bio, rq) \ 742 if ((rq->bio)) \ 743 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 744 745 #define rq_for_each_segment(bvl, _rq, _iter) \ 746 __rq_for_each_bio(_iter.bio, _rq) \ 747 bio_for_each_segment(bvl, _iter.bio, _iter.i) 748 749 #define rq_iter_last(rq, _iter) \ 750 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) 751 752 extern int blk_register_queue(struct gendisk *disk); 753 extern void blk_unregister_queue(struct gendisk *disk); 754 extern void register_disk(struct gendisk *dev); 755 extern void generic_make_request(struct bio *bio); 756 extern void blk_rq_init(struct request_queue *q, struct request *rq); 757 extern void blk_put_request(struct request *); 758 extern void __blk_put_request(struct request_queue *, struct request *); 759 extern struct request *blk_get_request(struct request_queue *, int, gfp_t); 760 extern struct request *blk_make_request(struct request_queue *, struct bio *, 761 gfp_t); 762 extern void blk_insert_request(struct request_queue *, struct request *, int, void *); 763 extern void blk_requeue_request(struct request_queue *, struct request *); 764 extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); 765 extern int blk_lld_busy(struct request_queue *q); 766 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 767 struct bio_set *bs, gfp_t gfp_mask, 768 int (*bio_ctr)(struct bio *, struct bio *, void *), 769 void *data); 770 extern void blk_rq_unprep_clone(struct request *rq); 771 extern int blk_insert_cloned_request(struct request_queue *q, 772 struct request *rq); 773 extern void blk_plug_device(struct request_queue *); 774 extern void blk_plug_device_unlocked(struct request_queue *); 775 extern int blk_remove_plug(struct request_queue *); 776 extern void blk_recount_segments(struct request_queue *, struct bio *); 777 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 778 unsigned int, void __user *); 779 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 780 struct scsi_ioctl_command __user *); 781 782 /* 783 * A queue has just exitted congestion. Note this in the global counter of 784 * congested queues, and wake up anyone who was waiting for requests to be 785 * put back. 786 */ 787 static inline void blk_clear_queue_congested(struct request_queue *q, int sync) 788 { 789 clear_bdi_congested(&q->backing_dev_info, sync); 790 } 791 792 /* 793 * A queue has just entered congestion. Flag that in the queue's VM-visible 794 * state flags and increment the global gounter of congested queues. 795 */ 796 static inline void blk_set_queue_congested(struct request_queue *q, int sync) 797 { 798 set_bdi_congested(&q->backing_dev_info, sync); 799 } 800 801 extern void blk_start_queue(struct request_queue *q); 802 extern void blk_stop_queue(struct request_queue *q); 803 extern void blk_sync_queue(struct request_queue *q); 804 extern void __blk_stop_queue(struct request_queue *q); 805 extern void __blk_run_queue(struct request_queue *); 806 extern void blk_run_queue(struct request_queue *); 807 extern int blk_rq_map_user(struct request_queue *, struct request *, 808 struct rq_map_data *, void __user *, unsigned long, 809 gfp_t); 810 extern int blk_rq_unmap_user(struct bio *); 811 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 812 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 813 struct rq_map_data *, struct sg_iovec *, int, 814 unsigned int, gfp_t); 815 extern int blk_execute_rq(struct request_queue *, struct gendisk *, 816 struct request *, int); 817 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 818 struct request *, int, rq_end_io_fn *); 819 extern void blk_unplug(struct request_queue *q); 820 821 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 822 { 823 return bdev->bd_disk->queue; 824 } 825 826 static inline void blk_run_backing_dev(struct backing_dev_info *bdi, 827 struct page *page) 828 { 829 if (bdi && bdi->unplug_io_fn) 830 bdi->unplug_io_fn(bdi, page); 831 } 832 833 static inline void blk_run_address_space(struct address_space *mapping) 834 { 835 if (mapping) 836 blk_run_backing_dev(mapping->backing_dev_info, NULL); 837 } 838 839 /* 840 * blk_rq_pos() : the current sector 841 * blk_rq_bytes() : bytes left in the entire request 842 * blk_rq_cur_bytes() : bytes left in the current segment 843 * blk_rq_err_bytes() : bytes left till the next error boundary 844 * blk_rq_sectors() : sectors left in the entire request 845 * blk_rq_cur_sectors() : sectors left in the current segment 846 * blk_rq_err_sectors() : sectors left till the next error boundary 847 */ 848 static inline sector_t blk_rq_pos(const struct request *rq) 849 { 850 return rq->__sector; 851 } 852 853 static inline unsigned int blk_rq_bytes(const struct request *rq) 854 { 855 return rq->__data_len; 856 } 857 858 static inline int blk_rq_cur_bytes(const struct request *rq) 859 { 860 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 861 } 862 863 extern unsigned int blk_rq_err_bytes(const struct request *rq); 864 865 static inline unsigned int blk_rq_sectors(const struct request *rq) 866 { 867 return blk_rq_bytes(rq) >> 9; 868 } 869 870 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 871 { 872 return blk_rq_cur_bytes(rq) >> 9; 873 } 874 875 static inline unsigned int blk_rq_err_sectors(const struct request *rq) 876 { 877 return blk_rq_err_bytes(rq) >> 9; 878 } 879 880 /* 881 * Request issue related functions. 882 */ 883 extern struct request *blk_peek_request(struct request_queue *q); 884 extern void blk_start_request(struct request *rq); 885 extern struct request *blk_fetch_request(struct request_queue *q); 886 887 /* 888 * Request completion related functions. 889 * 890 * blk_update_request() completes given number of bytes and updates 891 * the request without completing it. 892 * 893 * blk_end_request() and friends. __blk_end_request() must be called 894 * with the request queue spinlock acquired. 895 * 896 * Several drivers define their own end_request and call 897 * blk_end_request() for parts of the original function. 898 * This prevents code duplication in drivers. 899 */ 900 extern bool blk_update_request(struct request *rq, int error, 901 unsigned int nr_bytes); 902 extern bool blk_end_request(struct request *rq, int error, 903 unsigned int nr_bytes); 904 extern void blk_end_request_all(struct request *rq, int error); 905 extern bool blk_end_request_cur(struct request *rq, int error); 906 extern bool blk_end_request_err(struct request *rq, int error); 907 extern bool __blk_end_request(struct request *rq, int error, 908 unsigned int nr_bytes); 909 extern void __blk_end_request_all(struct request *rq, int error); 910 extern bool __blk_end_request_cur(struct request *rq, int error); 911 extern bool __blk_end_request_err(struct request *rq, int error); 912 913 extern void blk_complete_request(struct request *); 914 extern void __blk_complete_request(struct request *); 915 extern void blk_abort_request(struct request *); 916 extern void blk_abort_queue(struct request_queue *); 917 918 /* 919 * Access functions for manipulating queue properties 920 */ 921 extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, 922 spinlock_t *lock, int node_id); 923 extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); 924 extern void blk_cleanup_queue(struct request_queue *); 925 extern void blk_queue_make_request(struct request_queue *, make_request_fn *); 926 extern void blk_queue_bounce_limit(struct request_queue *, u64); 927 extern void blk_queue_max_sectors(struct request_queue *, unsigned int); 928 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 929 extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); 930 extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); 931 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 932 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); 933 extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); 934 extern void blk_queue_alignment_offset(struct request_queue *q, 935 unsigned int alignment); 936 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 937 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 938 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 939 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 940 extern void blk_set_default_limits(struct queue_limits *lim); 941 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 942 sector_t offset); 943 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 944 sector_t offset); 945 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); 946 extern void blk_queue_dma_pad(struct request_queue *, unsigned int); 947 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 948 extern int blk_queue_dma_drain(struct request_queue *q, 949 dma_drain_needed_fn *dma_drain_needed, 950 void *buf, unsigned int size); 951 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); 952 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 953 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); 954 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); 955 extern void blk_queue_dma_alignment(struct request_queue *, int); 956 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 957 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); 958 extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *); 959 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); 960 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 961 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); 962 extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); 963 extern bool blk_do_ordered(struct request_queue *, struct request **); 964 extern unsigned blk_ordered_cur_seq(struct request_queue *); 965 extern unsigned blk_ordered_req_seq(struct request *); 966 extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); 967 968 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); 969 extern void blk_dump_rq_flags(struct request *, char *); 970 extern void generic_unplug_device(struct request_queue *); 971 extern long nr_blockdev_pages(void); 972 973 int blk_get_queue(struct request_queue *); 974 struct request_queue *blk_alloc_queue(gfp_t); 975 struct request_queue *blk_alloc_queue_node(gfp_t, int); 976 extern void blk_put_queue(struct request_queue *); 977 978 /* 979 * tag stuff 980 */ 981 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) 982 extern int blk_queue_start_tag(struct request_queue *, struct request *); 983 extern struct request *blk_queue_find_tag(struct request_queue *, int); 984 extern void blk_queue_end_tag(struct request_queue *, struct request *); 985 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); 986 extern void blk_queue_free_tags(struct request_queue *); 987 extern int blk_queue_resize_tags(struct request_queue *, int); 988 extern void blk_queue_invalidate_tags(struct request_queue *); 989 extern struct blk_queue_tag *blk_init_tags(int); 990 extern void blk_free_tags(struct blk_queue_tag *); 991 992 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, 993 int tag) 994 { 995 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) 996 return NULL; 997 return bqt->tag_index[tag]; 998 } 999 1000 extern int blkdev_issue_flush(struct block_device *, sector_t *); 1001 #define DISCARD_FL_WAIT 0x01 /* wait for completion */ 1002 #define DISCARD_FL_BARRIER 0x02 /* issue DISCARD_BARRIER request */ 1003 extern int blkdev_issue_discard(struct block_device *, sector_t sector, 1004 sector_t nr_sects, gfp_t, int flags); 1005 1006 static inline int sb_issue_discard(struct super_block *sb, 1007 sector_t block, sector_t nr_blocks) 1008 { 1009 block <<= (sb->s_blocksize_bits - 9); 1010 nr_blocks <<= (sb->s_blocksize_bits - 9); 1011 return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, 1012 DISCARD_FL_BARRIER); 1013 } 1014 1015 extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); 1016 1017 #define MAX_PHYS_SEGMENTS 128 1018 #define MAX_HW_SEGMENTS 128 1019 #define SAFE_MAX_SECTORS 255 1020 #define BLK_DEF_MAX_SECTORS 1024 1021 1022 #define MAX_SEGMENT_SIZE 65536 1023 1024 #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL 1025 1026 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) 1027 1028 static inline unsigned long queue_bounce_pfn(struct request_queue *q) 1029 { 1030 return q->limits.bounce_pfn; 1031 } 1032 1033 static inline unsigned long queue_segment_boundary(struct request_queue *q) 1034 { 1035 return q->limits.seg_boundary_mask; 1036 } 1037 1038 static inline unsigned int queue_max_sectors(struct request_queue *q) 1039 { 1040 return q->limits.max_sectors; 1041 } 1042 1043 static inline unsigned int queue_max_hw_sectors(struct request_queue *q) 1044 { 1045 return q->limits.max_hw_sectors; 1046 } 1047 1048 static inline unsigned short queue_max_hw_segments(struct request_queue *q) 1049 { 1050 return q->limits.max_hw_segments; 1051 } 1052 1053 static inline unsigned short queue_max_phys_segments(struct request_queue *q) 1054 { 1055 return q->limits.max_phys_segments; 1056 } 1057 1058 static inline unsigned int queue_max_segment_size(struct request_queue *q) 1059 { 1060 return q->limits.max_segment_size; 1061 } 1062 1063 static inline unsigned short queue_logical_block_size(struct request_queue *q) 1064 { 1065 int retval = 512; 1066 1067 if (q && q->limits.logical_block_size) 1068 retval = q->limits.logical_block_size; 1069 1070 return retval; 1071 } 1072 1073 static inline unsigned short bdev_logical_block_size(struct block_device *bdev) 1074 { 1075 return queue_logical_block_size(bdev_get_queue(bdev)); 1076 } 1077 1078 static inline unsigned int queue_physical_block_size(struct request_queue *q) 1079 { 1080 return q->limits.physical_block_size; 1081 } 1082 1083 static inline unsigned int queue_io_min(struct request_queue *q) 1084 { 1085 return q->limits.io_min; 1086 } 1087 1088 static inline unsigned int queue_io_opt(struct request_queue *q) 1089 { 1090 return q->limits.io_opt; 1091 } 1092 1093 static inline int queue_alignment_offset(struct request_queue *q) 1094 { 1095 if (q && q->limits.misaligned) 1096 return -1; 1097 1098 if (q && q->limits.alignment_offset) 1099 return q->limits.alignment_offset; 1100 1101 return 0; 1102 } 1103 1104 static inline int queue_sector_alignment_offset(struct request_queue *q, 1105 sector_t sector) 1106 { 1107 return ((sector << 9) - q->limits.alignment_offset) 1108 & (q->limits.io_min - 1); 1109 } 1110 1111 static inline int queue_dma_alignment(struct request_queue *q) 1112 { 1113 return q ? q->dma_alignment : 511; 1114 } 1115 1116 static inline int blk_rq_aligned(struct request_queue *q, void *addr, 1117 unsigned int len) 1118 { 1119 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1120 return !((unsigned long)addr & alignment) && !(len & alignment); 1121 } 1122 1123 /* assumes size > 256 */ 1124 static inline unsigned int blksize_bits(unsigned int size) 1125 { 1126 unsigned int bits = 8; 1127 do { 1128 bits++; 1129 size >>= 1; 1130 } while (size > 256); 1131 return bits; 1132 } 1133 1134 static inline unsigned int block_size(struct block_device *bdev) 1135 { 1136 return bdev->bd_block_size; 1137 } 1138 1139 typedef struct {struct page *v;} Sector; 1140 1141 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); 1142 1143 static inline void put_dev_sector(Sector p) 1144 { 1145 page_cache_release(p.v); 1146 } 1147 1148 struct work_struct; 1149 int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); 1150 1151 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1152 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1153 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1154 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1155 1156 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1157 1158 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ 1159 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ 1160 1161 struct blk_integrity_exchg { 1162 void *prot_buf; 1163 void *data_buf; 1164 sector_t sector; 1165 unsigned int data_size; 1166 unsigned short sector_size; 1167 const char *disk_name; 1168 }; 1169 1170 typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); 1171 typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); 1172 typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); 1173 typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); 1174 1175 struct blk_integrity { 1176 integrity_gen_fn *generate_fn; 1177 integrity_vrfy_fn *verify_fn; 1178 integrity_set_tag_fn *set_tag_fn; 1179 integrity_get_tag_fn *get_tag_fn; 1180 1181 unsigned short flags; 1182 unsigned short tuple_size; 1183 unsigned short sector_size; 1184 unsigned short tag_size; 1185 1186 const char *name; 1187 1188 struct kobject kobj; 1189 }; 1190 1191 extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); 1192 extern void blk_integrity_unregister(struct gendisk *); 1193 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1194 extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); 1195 extern int blk_rq_count_integrity_sg(struct request *); 1196 1197 static inline 1198 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1199 { 1200 return bdev->bd_disk->integrity; 1201 } 1202 1203 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1204 { 1205 return disk->integrity; 1206 } 1207 1208 static inline int blk_integrity_rq(struct request *rq) 1209 { 1210 if (rq->bio == NULL) 1211 return 0; 1212 1213 return bio_integrity(rq->bio); 1214 } 1215 1216 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1217 1218 #define blk_integrity_rq(rq) (0) 1219 #define blk_rq_count_integrity_sg(a) (0) 1220 #define blk_rq_map_integrity_sg(a, b) (0) 1221 #define bdev_get_integrity(a) (0) 1222 #define blk_get_integrity(a) (0) 1223 #define blk_integrity_compare(a, b) (0) 1224 #define blk_integrity_register(a, b) (0) 1225 #define blk_integrity_unregister(a) do { } while (0); 1226 1227 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1228 1229 struct block_device_operations { 1230 int (*open) (struct block_device *, fmode_t); 1231 int (*release) (struct gendisk *, fmode_t); 1232 int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1233 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1234 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1235 int (*direct_access) (struct block_device *, sector_t, 1236 void **, unsigned long *); 1237 int (*media_changed) (struct gendisk *); 1238 unsigned long long (*set_capacity) (struct gendisk *, 1239 unsigned long long); 1240 int (*revalidate_disk) (struct gendisk *); 1241 int (*getgeo)(struct block_device *, struct hd_geometry *); 1242 struct module *owner; 1243 }; 1244 1245 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1246 unsigned long); 1247 #else /* CONFIG_BLOCK */ 1248 /* 1249 * stubs for when the block layer is configured out 1250 */ 1251 #define buffer_heads_over_limit 0 1252 1253 static inline long nr_blockdev_pages(void) 1254 { 1255 return 0; 1256 } 1257 1258 #endif /* CONFIG_BLOCK */ 1259 1260 #endif 1261