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 /* 64 * for ATA/ATAPI devices. this really doesn't belong here, ide should 65 * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver 66 * private REQ_LB opcodes to differentiate what type of request this is 67 */ 68 REQ_TYPE_ATA_TASKFILE, 69 REQ_TYPE_ATA_PC, 70 }; 71 72 #define BLK_MAX_CDB 16 73 74 /* 75 * try to put the fields that are referenced together in the same cacheline. 76 * if you modify this structure, be sure to check block/blk-core.c:blk_rq_init() 77 * as well! 78 */ 79 struct request { 80 struct list_head queuelist; 81 struct call_single_data csd; 82 83 struct request_queue *q; 84 85 unsigned int cmd_flags; 86 enum rq_cmd_type_bits cmd_type; 87 unsigned long atomic_flags; 88 89 int cpu; 90 91 /* the following two fields are internal, NEVER access directly */ 92 unsigned int __data_len; /* total data len */ 93 sector_t __sector; /* sector cursor */ 94 95 struct bio *bio; 96 struct bio *biotail; 97 98 struct hlist_node hash; /* merge hash */ 99 /* 100 * The rb_node is only used inside the io scheduler, requests 101 * are pruned when moved to the dispatch queue. So let the 102 * completion_data share space with the rb_node. 103 */ 104 union { 105 struct rb_node rb_node; /* sort/lookup */ 106 void *completion_data; 107 }; 108 109 /* 110 * Three pointers are available for the IO schedulers, if they need 111 * more they have to dynamically allocate it. Flush requests are 112 * never put on the IO scheduler. So let the flush fields share 113 * space with the three elevator_private pointers. 114 */ 115 union { 116 void *elevator_private[3]; 117 struct { 118 unsigned int seq; 119 struct list_head list; 120 } flush; 121 }; 122 123 struct gendisk *rq_disk; 124 struct hd_struct *part; 125 unsigned long start_time; 126 #ifdef CONFIG_BLK_CGROUP 127 unsigned long long start_time_ns; 128 unsigned long long io_start_time_ns; /* when passed to hardware */ 129 #endif 130 /* Number of scatter-gather DMA addr+len pairs after 131 * physical address coalescing is performed. 132 */ 133 unsigned short nr_phys_segments; 134 #if defined(CONFIG_BLK_DEV_INTEGRITY) 135 unsigned short nr_integrity_segments; 136 #endif 137 138 unsigned short ioprio; 139 140 int ref_count; 141 142 void *special; /* opaque pointer available for LLD use */ 143 char *buffer; /* kaddr of the current segment if available */ 144 145 int tag; 146 int errors; 147 148 /* 149 * when request is used as a packet command carrier 150 */ 151 unsigned char __cmd[BLK_MAX_CDB]; 152 unsigned char *cmd; 153 unsigned short cmd_len; 154 155 unsigned int extra_len; /* length of alignment and padding */ 156 unsigned int sense_len; 157 unsigned int resid_len; /* residual count */ 158 void *sense; 159 160 unsigned long deadline; 161 struct list_head timeout_list; 162 unsigned int timeout; 163 int retries; 164 165 /* 166 * completion callback. 167 */ 168 rq_end_io_fn *end_io; 169 void *end_io_data; 170 171 /* for bidi */ 172 struct request *next_rq; 173 }; 174 175 static inline unsigned short req_get_ioprio(struct request *req) 176 { 177 return req->ioprio; 178 } 179 180 /* 181 * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME 182 * requests. Some step values could eventually be made generic. 183 */ 184 struct request_pm_state 185 { 186 /* PM state machine step value, currently driver specific */ 187 int pm_step; 188 /* requested PM state value (S1, S2, S3, S4, ...) */ 189 u32 pm_state; 190 void* data; /* for driver use */ 191 }; 192 193 #include <linux/elevator.h> 194 195 typedef void (request_fn_proc) (struct request_queue *q); 196 typedef int (make_request_fn) (struct request_queue *q, struct bio *bio); 197 typedef int (prep_rq_fn) (struct request_queue *, struct request *); 198 typedef void (unprep_rq_fn) (struct request_queue *, struct request *); 199 200 struct bio_vec; 201 struct bvec_merge_data { 202 struct block_device *bi_bdev; 203 sector_t bi_sector; 204 unsigned bi_size; 205 unsigned long bi_rw; 206 }; 207 typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, 208 struct bio_vec *); 209 typedef void (softirq_done_fn)(struct request *); 210 typedef int (dma_drain_needed_fn)(struct request *); 211 typedef int (lld_busy_fn) (struct request_queue *q); 212 213 enum blk_eh_timer_return { 214 BLK_EH_NOT_HANDLED, 215 BLK_EH_HANDLED, 216 BLK_EH_RESET_TIMER, 217 }; 218 219 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); 220 221 enum blk_queue_state { 222 Queue_down, 223 Queue_up, 224 }; 225 226 struct blk_queue_tag { 227 struct request **tag_index; /* map of busy tags */ 228 unsigned long *tag_map; /* bit map of free/busy tags */ 229 int busy; /* current depth */ 230 int max_depth; /* what we will send to device */ 231 int real_max_depth; /* what the array can hold */ 232 atomic_t refcnt; /* map can be shared */ 233 }; 234 235 #define BLK_SCSI_MAX_CMDS (256) 236 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 237 238 struct queue_limits { 239 unsigned long bounce_pfn; 240 unsigned long seg_boundary_mask; 241 242 unsigned int max_hw_sectors; 243 unsigned int max_sectors; 244 unsigned int max_segment_size; 245 unsigned int physical_block_size; 246 unsigned int alignment_offset; 247 unsigned int io_min; 248 unsigned int io_opt; 249 unsigned int max_discard_sectors; 250 unsigned int discard_granularity; 251 unsigned int discard_alignment; 252 253 unsigned short logical_block_size; 254 unsigned short max_segments; 255 unsigned short max_integrity_segments; 256 257 unsigned char misaligned; 258 unsigned char discard_misaligned; 259 unsigned char cluster; 260 unsigned char discard_zeroes_data; 261 }; 262 263 struct request_queue { 264 /* 265 * Together with queue_head for cacheline sharing 266 */ 267 struct list_head queue_head; 268 struct request *last_merge; 269 struct elevator_queue *elevator; 270 271 /* 272 * the queue request freelist, one for reads and one for writes 273 */ 274 struct request_list rq; 275 276 request_fn_proc *request_fn; 277 make_request_fn *make_request_fn; 278 prep_rq_fn *prep_rq_fn; 279 unprep_rq_fn *unprep_rq_fn; 280 merge_bvec_fn *merge_bvec_fn; 281 softirq_done_fn *softirq_done_fn; 282 rq_timed_out_fn *rq_timed_out_fn; 283 dma_drain_needed_fn *dma_drain_needed; 284 lld_busy_fn *lld_busy_fn; 285 286 /* 287 * Dispatch queue sorting 288 */ 289 sector_t end_sector; 290 struct request *boundary_rq; 291 292 /* 293 * Delayed queue handling 294 */ 295 struct delayed_work delay_work; 296 297 struct backing_dev_info backing_dev_info; 298 299 /* 300 * The queue owner gets to use this for whatever they like. 301 * ll_rw_blk doesn't touch it. 302 */ 303 void *queuedata; 304 305 /* 306 * various queue flags, see QUEUE_* below 307 */ 308 unsigned long queue_flags; 309 310 /* 311 * queue needs bounce pages for pages above this limit 312 */ 313 gfp_t bounce_gfp; 314 315 /* 316 * protects queue structures from reentrancy. ->__queue_lock should 317 * _never_ be used directly, it is queue private. always use 318 * ->queue_lock. 319 */ 320 spinlock_t __queue_lock; 321 spinlock_t *queue_lock; 322 323 /* 324 * queue kobject 325 */ 326 struct kobject kobj; 327 328 /* 329 * queue settings 330 */ 331 unsigned long nr_requests; /* Max # of requests */ 332 unsigned int nr_congestion_on; 333 unsigned int nr_congestion_off; 334 unsigned int nr_batching; 335 336 unsigned int dma_drain_size; 337 void *dma_drain_buffer; 338 unsigned int dma_pad_mask; 339 unsigned int dma_alignment; 340 341 struct blk_queue_tag *queue_tags; 342 struct list_head tag_busy_list; 343 344 unsigned int nr_sorted; 345 unsigned int in_flight[2]; 346 347 unsigned int rq_timeout; 348 struct timer_list timeout; 349 struct list_head timeout_list; 350 351 struct queue_limits limits; 352 353 /* 354 * sg stuff 355 */ 356 unsigned int sg_timeout; 357 unsigned int sg_reserved_size; 358 int node; 359 #ifdef CONFIG_BLK_DEV_IO_TRACE 360 struct blk_trace *blk_trace; 361 #endif 362 /* 363 * for flush operations 364 */ 365 unsigned int flush_flags; 366 unsigned int flush_not_queueable:1; 367 unsigned int flush_queue_delayed:1; 368 unsigned int flush_pending_idx:1; 369 unsigned int flush_running_idx:1; 370 unsigned long flush_pending_since; 371 struct list_head flush_queue[2]; 372 struct list_head flush_data_in_flight; 373 struct request flush_rq; 374 375 struct mutex sysfs_lock; 376 377 #if defined(CONFIG_BLK_DEV_BSG) 378 struct bsg_class_device bsg_dev; 379 #endif 380 381 #ifdef CONFIG_BLK_DEV_THROTTLING 382 /* Throttle data */ 383 struct throtl_data *td; 384 #endif 385 }; 386 387 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ 388 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ 389 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ 390 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ 391 #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ 392 #define QUEUE_FLAG_ELVSWITCH 6 /* don't use elevator, just do FIFO */ 393 #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ 394 #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ 395 #define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */ 396 #define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */ 397 #define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */ 398 #define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */ 399 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 400 #define QUEUE_FLAG_IO_STAT 13 /* do IO stats */ 401 #define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */ 402 #define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */ 403 #define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */ 404 #define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */ 405 #define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */ 406 407 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 408 (1 << QUEUE_FLAG_STACKABLE) | \ 409 (1 << QUEUE_FLAG_SAME_COMP) | \ 410 (1 << QUEUE_FLAG_ADD_RANDOM)) 411 412 static inline int queue_is_locked(struct request_queue *q) 413 { 414 #ifdef CONFIG_SMP 415 spinlock_t *lock = q->queue_lock; 416 return lock && spin_is_locked(lock); 417 #else 418 return 1; 419 #endif 420 } 421 422 static inline void queue_flag_set_unlocked(unsigned int flag, 423 struct request_queue *q) 424 { 425 __set_bit(flag, &q->queue_flags); 426 } 427 428 static inline int queue_flag_test_and_clear(unsigned int flag, 429 struct request_queue *q) 430 { 431 WARN_ON_ONCE(!queue_is_locked(q)); 432 433 if (test_bit(flag, &q->queue_flags)) { 434 __clear_bit(flag, &q->queue_flags); 435 return 1; 436 } 437 438 return 0; 439 } 440 441 static inline int queue_flag_test_and_set(unsigned int flag, 442 struct request_queue *q) 443 { 444 WARN_ON_ONCE(!queue_is_locked(q)); 445 446 if (!test_bit(flag, &q->queue_flags)) { 447 __set_bit(flag, &q->queue_flags); 448 return 0; 449 } 450 451 return 1; 452 } 453 454 static inline void queue_flag_set(unsigned int flag, struct request_queue *q) 455 { 456 WARN_ON_ONCE(!queue_is_locked(q)); 457 __set_bit(flag, &q->queue_flags); 458 } 459 460 static inline void queue_flag_clear_unlocked(unsigned int flag, 461 struct request_queue *q) 462 { 463 __clear_bit(flag, &q->queue_flags); 464 } 465 466 static inline int queue_in_flight(struct request_queue *q) 467 { 468 return q->in_flight[0] + q->in_flight[1]; 469 } 470 471 static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) 472 { 473 WARN_ON_ONCE(!queue_is_locked(q)); 474 __clear_bit(flag, &q->queue_flags); 475 } 476 477 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) 478 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 479 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 480 #define blk_queue_noxmerges(q) \ 481 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 482 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 483 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 484 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 485 #define blk_queue_stackable(q) \ 486 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) 487 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 488 #define blk_queue_secdiscard(q) (blk_queue_discard(q) && \ 489 test_bit(QUEUE_FLAG_SECDISCARD, &(q)->queue_flags)) 490 491 #define blk_noretry_request(rq) \ 492 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 493 REQ_FAILFAST_DRIVER)) 494 495 #define blk_account_rq(rq) \ 496 (((rq)->cmd_flags & REQ_STARTED) && \ 497 ((rq)->cmd_type == REQ_TYPE_FS || \ 498 ((rq)->cmd_flags & REQ_DISCARD))) 499 500 #define blk_pm_request(rq) \ 501 ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ 502 (rq)->cmd_type == REQ_TYPE_PM_RESUME) 503 504 #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) 505 #define blk_bidi_rq(rq) ((rq)->next_rq != NULL) 506 /* rq->queuelist of dequeued request must be list_empty() */ 507 #define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist)) 508 509 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 510 511 #define rq_data_dir(rq) ((rq)->cmd_flags & 1) 512 513 static inline unsigned int blk_queue_cluster(struct request_queue *q) 514 { 515 return q->limits.cluster; 516 } 517 518 /* 519 * We regard a request as sync, if either a read or a sync write 520 */ 521 static inline bool rw_is_sync(unsigned int rw_flags) 522 { 523 return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); 524 } 525 526 static inline bool rq_is_sync(struct request *rq) 527 { 528 return rw_is_sync(rq->cmd_flags); 529 } 530 531 static inline int blk_queue_full(struct request_queue *q, int sync) 532 { 533 if (sync) 534 return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); 535 return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); 536 } 537 538 static inline void blk_set_queue_full(struct request_queue *q, int sync) 539 { 540 if (sync) 541 queue_flag_set(QUEUE_FLAG_SYNCFULL, q); 542 else 543 queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); 544 } 545 546 static inline void blk_clear_queue_full(struct request_queue *q, int sync) 547 { 548 if (sync) 549 queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); 550 else 551 queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); 552 } 553 554 555 /* 556 * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may 557 * it already be started by driver. 558 */ 559 #define RQ_NOMERGE_FLAGS \ 560 (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) 561 #define rq_mergeable(rq) \ 562 (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ 563 (((rq)->cmd_flags & REQ_DISCARD) || \ 564 (rq)->cmd_type == REQ_TYPE_FS)) 565 566 /* 567 * q->prep_rq_fn return values 568 */ 569 #define BLKPREP_OK 0 /* serve it */ 570 #define BLKPREP_KILL 1 /* fatal error, kill */ 571 #define BLKPREP_DEFER 2 /* leave on queue */ 572 573 extern unsigned long blk_max_low_pfn, blk_max_pfn; 574 575 /* 576 * standard bounce addresses: 577 * 578 * BLK_BOUNCE_HIGH : bounce all highmem pages 579 * BLK_BOUNCE_ANY : don't bounce anything 580 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 581 */ 582 583 #if BITS_PER_LONG == 32 584 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 585 #else 586 #define BLK_BOUNCE_HIGH -1ULL 587 #endif 588 #define BLK_BOUNCE_ANY (-1ULL) 589 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 590 591 /* 592 * default timeout for SG_IO if none specified 593 */ 594 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 595 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 596 597 #ifdef CONFIG_BOUNCE 598 extern int init_emergency_isa_pool(void); 599 extern void blk_queue_bounce(struct request_queue *q, struct bio **bio); 600 #else 601 static inline int init_emergency_isa_pool(void) 602 { 603 return 0; 604 } 605 static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio) 606 { 607 } 608 #endif /* CONFIG_MMU */ 609 610 struct rq_map_data { 611 struct page **pages; 612 int page_order; 613 int nr_entries; 614 unsigned long offset; 615 int null_mapped; 616 int from_user; 617 }; 618 619 struct req_iterator { 620 int i; 621 struct bio *bio; 622 }; 623 624 /* This should not be used directly - use rq_for_each_segment */ 625 #define for_each_bio(_bio) \ 626 for (; _bio; _bio = _bio->bi_next) 627 #define __rq_for_each_bio(_bio, rq) \ 628 if ((rq->bio)) \ 629 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 630 631 #define rq_for_each_segment(bvl, _rq, _iter) \ 632 __rq_for_each_bio(_iter.bio, _rq) \ 633 bio_for_each_segment(bvl, _iter.bio, _iter.i) 634 635 #define rq_iter_last(rq, _iter) \ 636 (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) 637 638 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 639 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 640 #endif 641 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 642 extern void rq_flush_dcache_pages(struct request *rq); 643 #else 644 static inline void rq_flush_dcache_pages(struct request *rq) 645 { 646 } 647 #endif 648 649 extern int blk_register_queue(struct gendisk *disk); 650 extern void blk_unregister_queue(struct gendisk *disk); 651 extern void generic_make_request(struct bio *bio); 652 extern void blk_rq_init(struct request_queue *q, struct request *rq); 653 extern void blk_put_request(struct request *); 654 extern void __blk_put_request(struct request_queue *, struct request *); 655 extern struct request *blk_get_request(struct request_queue *, int, gfp_t); 656 extern struct request *blk_make_request(struct request_queue *, struct bio *, 657 gfp_t); 658 extern void blk_insert_request(struct request_queue *, struct request *, int, void *); 659 extern void blk_requeue_request(struct request_queue *, struct request *); 660 extern void blk_add_request_payload(struct request *rq, struct page *page, 661 unsigned int len); 662 extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); 663 extern int blk_lld_busy(struct request_queue *q); 664 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 665 struct bio_set *bs, gfp_t gfp_mask, 666 int (*bio_ctr)(struct bio *, struct bio *, void *), 667 void *data); 668 extern void blk_rq_unprep_clone(struct request *rq); 669 extern int blk_insert_cloned_request(struct request_queue *q, 670 struct request *rq); 671 extern void blk_delay_queue(struct request_queue *, unsigned long); 672 extern void blk_recount_segments(struct request_queue *, struct bio *); 673 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 674 unsigned int, void __user *); 675 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 676 struct scsi_ioctl_command __user *); 677 678 /* 679 * A queue has just exitted congestion. Note this in the global counter of 680 * congested queues, and wake up anyone who was waiting for requests to be 681 * put back. 682 */ 683 static inline void blk_clear_queue_congested(struct request_queue *q, int sync) 684 { 685 clear_bdi_congested(&q->backing_dev_info, sync); 686 } 687 688 /* 689 * A queue has just entered congestion. Flag that in the queue's VM-visible 690 * state flags and increment the global gounter of congested queues. 691 */ 692 static inline void blk_set_queue_congested(struct request_queue *q, int sync) 693 { 694 set_bdi_congested(&q->backing_dev_info, sync); 695 } 696 697 extern void blk_start_queue(struct request_queue *q); 698 extern void blk_stop_queue(struct request_queue *q); 699 extern void blk_sync_queue(struct request_queue *q); 700 extern void __blk_stop_queue(struct request_queue *q); 701 extern void __blk_run_queue(struct request_queue *q); 702 extern void blk_run_queue(struct request_queue *); 703 extern void blk_run_queue_async(struct request_queue *q); 704 extern int blk_rq_map_user(struct request_queue *, struct request *, 705 struct rq_map_data *, void __user *, unsigned long, 706 gfp_t); 707 extern int blk_rq_unmap_user(struct bio *); 708 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 709 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 710 struct rq_map_data *, struct sg_iovec *, int, 711 unsigned int, gfp_t); 712 extern int blk_execute_rq(struct request_queue *, struct gendisk *, 713 struct request *, int); 714 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 715 struct request *, int, rq_end_io_fn *); 716 717 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 718 { 719 return bdev->bd_disk->queue; 720 } 721 722 /* 723 * blk_rq_pos() : the current sector 724 * blk_rq_bytes() : bytes left in the entire request 725 * blk_rq_cur_bytes() : bytes left in the current segment 726 * blk_rq_err_bytes() : bytes left till the next error boundary 727 * blk_rq_sectors() : sectors left in the entire request 728 * blk_rq_cur_sectors() : sectors left in the current segment 729 */ 730 static inline sector_t blk_rq_pos(const struct request *rq) 731 { 732 return rq->__sector; 733 } 734 735 static inline unsigned int blk_rq_bytes(const struct request *rq) 736 { 737 return rq->__data_len; 738 } 739 740 static inline int blk_rq_cur_bytes(const struct request *rq) 741 { 742 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 743 } 744 745 extern unsigned int blk_rq_err_bytes(const struct request *rq); 746 747 static inline unsigned int blk_rq_sectors(const struct request *rq) 748 { 749 return blk_rq_bytes(rq) >> 9; 750 } 751 752 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 753 { 754 return blk_rq_cur_bytes(rq) >> 9; 755 } 756 757 /* 758 * Request issue related functions. 759 */ 760 extern struct request *blk_peek_request(struct request_queue *q); 761 extern void blk_start_request(struct request *rq); 762 extern struct request *blk_fetch_request(struct request_queue *q); 763 764 /* 765 * Request completion related functions. 766 * 767 * blk_update_request() completes given number of bytes and updates 768 * the request without completing it. 769 * 770 * blk_end_request() and friends. __blk_end_request() must be called 771 * with the request queue spinlock acquired. 772 * 773 * Several drivers define their own end_request and call 774 * blk_end_request() for parts of the original function. 775 * This prevents code duplication in drivers. 776 */ 777 extern bool blk_update_request(struct request *rq, int error, 778 unsigned int nr_bytes); 779 extern bool blk_end_request(struct request *rq, int error, 780 unsigned int nr_bytes); 781 extern void blk_end_request_all(struct request *rq, int error); 782 extern bool blk_end_request_cur(struct request *rq, int error); 783 extern bool blk_end_request_err(struct request *rq, int error); 784 extern bool __blk_end_request(struct request *rq, int error, 785 unsigned int nr_bytes); 786 extern void __blk_end_request_all(struct request *rq, int error); 787 extern bool __blk_end_request_cur(struct request *rq, int error); 788 extern bool __blk_end_request_err(struct request *rq, int error); 789 790 extern void blk_complete_request(struct request *); 791 extern void __blk_complete_request(struct request *); 792 extern void blk_abort_request(struct request *); 793 extern void blk_abort_queue(struct request_queue *); 794 extern void blk_unprep_request(struct request *); 795 796 /* 797 * Access functions for manipulating queue properties 798 */ 799 extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn, 800 spinlock_t *lock, int node_id); 801 extern struct request_queue *blk_init_allocated_queue_node(struct request_queue *, 802 request_fn_proc *, 803 spinlock_t *, int node_id); 804 extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *); 805 extern struct request_queue *blk_init_allocated_queue(struct request_queue *, 806 request_fn_proc *, spinlock_t *); 807 extern void blk_cleanup_queue(struct request_queue *); 808 extern void blk_queue_make_request(struct request_queue *, make_request_fn *); 809 extern void blk_queue_bounce_limit(struct request_queue *, u64); 810 extern void blk_limits_max_hw_sectors(struct queue_limits *, unsigned int); 811 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 812 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 813 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 814 extern void blk_queue_max_discard_sectors(struct request_queue *q, 815 unsigned int max_discard_sectors); 816 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); 817 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 818 extern void blk_queue_alignment_offset(struct request_queue *q, 819 unsigned int alignment); 820 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 821 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 822 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 823 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 824 extern void blk_set_default_limits(struct queue_limits *lim); 825 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 826 sector_t offset); 827 extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev, 828 sector_t offset); 829 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 830 sector_t offset); 831 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); 832 extern void blk_queue_dma_pad(struct request_queue *, unsigned int); 833 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 834 extern int blk_queue_dma_drain(struct request_queue *q, 835 dma_drain_needed_fn *dma_drain_needed, 836 void *buf, unsigned int size); 837 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); 838 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 839 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); 840 extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn); 841 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); 842 extern void blk_queue_dma_alignment(struct request_queue *, int); 843 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 844 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); 845 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); 846 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 847 extern void blk_queue_flush(struct request_queue *q, unsigned int flush); 848 extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); 849 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); 850 851 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); 852 extern void blk_dump_rq_flags(struct request *, char *); 853 extern long nr_blockdev_pages(void); 854 855 int blk_get_queue(struct request_queue *); 856 struct request_queue *blk_alloc_queue(gfp_t); 857 struct request_queue *blk_alloc_queue_node(gfp_t, int); 858 extern void blk_put_queue(struct request_queue *); 859 860 /* 861 * Note: Code in between changing the blk_plug list/cb_list or element of such 862 * lists is preemptable, but such code can't do sleep (or be very careful), 863 * otherwise data is corrupted. For details, please check schedule() where 864 * blk_schedule_flush_plug() is called. 865 */ 866 struct blk_plug { 867 unsigned long magic; 868 struct list_head list; 869 struct list_head cb_list; 870 unsigned int should_sort; 871 unsigned int count; 872 }; 873 #define BLK_MAX_REQUEST_COUNT 16 874 875 struct blk_plug_cb { 876 struct list_head list; 877 void (*callback)(struct blk_plug_cb *); 878 }; 879 880 extern void blk_start_plug(struct blk_plug *); 881 extern void blk_finish_plug(struct blk_plug *); 882 extern void blk_flush_plug_list(struct blk_plug *, bool); 883 884 static inline void blk_flush_plug(struct task_struct *tsk) 885 { 886 struct blk_plug *plug = tsk->plug; 887 888 if (plug) 889 blk_flush_plug_list(plug, false); 890 } 891 892 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 893 { 894 struct blk_plug *plug = tsk->plug; 895 896 if (plug) 897 blk_flush_plug_list(plug, true); 898 } 899 900 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 901 { 902 struct blk_plug *plug = tsk->plug; 903 904 return plug && (!list_empty(&plug->list) || !list_empty(&plug->cb_list)); 905 } 906 907 /* 908 * tag stuff 909 */ 910 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) 911 extern int blk_queue_start_tag(struct request_queue *, struct request *); 912 extern struct request *blk_queue_find_tag(struct request_queue *, int); 913 extern void blk_queue_end_tag(struct request_queue *, struct request *); 914 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); 915 extern void blk_queue_free_tags(struct request_queue *); 916 extern int blk_queue_resize_tags(struct request_queue *, int); 917 extern void blk_queue_invalidate_tags(struct request_queue *); 918 extern struct blk_queue_tag *blk_init_tags(int); 919 extern void blk_free_tags(struct blk_queue_tag *); 920 921 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, 922 int tag) 923 { 924 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) 925 return NULL; 926 return bqt->tag_index[tag]; 927 } 928 929 #define BLKDEV_DISCARD_SECURE 0x01 /* secure discard */ 930 931 extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *); 932 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 933 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 934 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 935 sector_t nr_sects, gfp_t gfp_mask); 936 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 937 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 938 { 939 return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9), 940 nr_blocks << (sb->s_blocksize_bits - 9), 941 gfp_mask, flags); 942 } 943 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 944 sector_t nr_blocks, gfp_t gfp_mask) 945 { 946 return blkdev_issue_zeroout(sb->s_bdev, 947 block << (sb->s_blocksize_bits - 9), 948 nr_blocks << (sb->s_blocksize_bits - 9), 949 gfp_mask); 950 } 951 952 extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); 953 954 enum blk_default_limits { 955 BLK_MAX_SEGMENTS = 128, 956 BLK_SAFE_MAX_SECTORS = 255, 957 BLK_DEF_MAX_SECTORS = 1024, 958 BLK_MAX_SEGMENT_SIZE = 65536, 959 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 960 }; 961 962 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) 963 964 static inline unsigned long queue_bounce_pfn(struct request_queue *q) 965 { 966 return q->limits.bounce_pfn; 967 } 968 969 static inline unsigned long queue_segment_boundary(struct request_queue *q) 970 { 971 return q->limits.seg_boundary_mask; 972 } 973 974 static inline unsigned int queue_max_sectors(struct request_queue *q) 975 { 976 return q->limits.max_sectors; 977 } 978 979 static inline unsigned int queue_max_hw_sectors(struct request_queue *q) 980 { 981 return q->limits.max_hw_sectors; 982 } 983 984 static inline unsigned short queue_max_segments(struct request_queue *q) 985 { 986 return q->limits.max_segments; 987 } 988 989 static inline unsigned int queue_max_segment_size(struct request_queue *q) 990 { 991 return q->limits.max_segment_size; 992 } 993 994 static inline unsigned short queue_logical_block_size(struct request_queue *q) 995 { 996 int retval = 512; 997 998 if (q && q->limits.logical_block_size) 999 retval = q->limits.logical_block_size; 1000 1001 return retval; 1002 } 1003 1004 static inline unsigned short bdev_logical_block_size(struct block_device *bdev) 1005 { 1006 return queue_logical_block_size(bdev_get_queue(bdev)); 1007 } 1008 1009 static inline unsigned int queue_physical_block_size(struct request_queue *q) 1010 { 1011 return q->limits.physical_block_size; 1012 } 1013 1014 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1015 { 1016 return queue_physical_block_size(bdev_get_queue(bdev)); 1017 } 1018 1019 static inline unsigned int queue_io_min(struct request_queue *q) 1020 { 1021 return q->limits.io_min; 1022 } 1023 1024 static inline int bdev_io_min(struct block_device *bdev) 1025 { 1026 return queue_io_min(bdev_get_queue(bdev)); 1027 } 1028 1029 static inline unsigned int queue_io_opt(struct request_queue *q) 1030 { 1031 return q->limits.io_opt; 1032 } 1033 1034 static inline int bdev_io_opt(struct block_device *bdev) 1035 { 1036 return queue_io_opt(bdev_get_queue(bdev)); 1037 } 1038 1039 static inline int queue_alignment_offset(struct request_queue *q) 1040 { 1041 if (q->limits.misaligned) 1042 return -1; 1043 1044 return q->limits.alignment_offset; 1045 } 1046 1047 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1048 { 1049 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1050 unsigned int alignment = (sector << 9) & (granularity - 1); 1051 1052 return (granularity + lim->alignment_offset - alignment) 1053 & (granularity - 1); 1054 } 1055 1056 static inline int bdev_alignment_offset(struct block_device *bdev) 1057 { 1058 struct request_queue *q = bdev_get_queue(bdev); 1059 1060 if (q->limits.misaligned) 1061 return -1; 1062 1063 if (bdev != bdev->bd_contains) 1064 return bdev->bd_part->alignment_offset; 1065 1066 return q->limits.alignment_offset; 1067 } 1068 1069 static inline int queue_discard_alignment(struct request_queue *q) 1070 { 1071 if (q->limits.discard_misaligned) 1072 return -1; 1073 1074 return q->limits.discard_alignment; 1075 } 1076 1077 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1078 { 1079 unsigned int alignment = (sector << 9) & (lim->discard_granularity - 1); 1080 1081 if (!lim->max_discard_sectors) 1082 return 0; 1083 1084 return (lim->discard_granularity + lim->discard_alignment - alignment) 1085 & (lim->discard_granularity - 1); 1086 } 1087 1088 static inline unsigned int queue_discard_zeroes_data(struct request_queue *q) 1089 { 1090 if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1) 1091 return 1; 1092 1093 return 0; 1094 } 1095 1096 static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev) 1097 { 1098 return queue_discard_zeroes_data(bdev_get_queue(bdev)); 1099 } 1100 1101 static inline int queue_dma_alignment(struct request_queue *q) 1102 { 1103 return q ? q->dma_alignment : 511; 1104 } 1105 1106 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1107 unsigned int len) 1108 { 1109 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1110 return !(addr & alignment) && !(len & alignment); 1111 } 1112 1113 /* assumes size > 256 */ 1114 static inline unsigned int blksize_bits(unsigned int size) 1115 { 1116 unsigned int bits = 8; 1117 do { 1118 bits++; 1119 size >>= 1; 1120 } while (size > 256); 1121 return bits; 1122 } 1123 1124 static inline unsigned int block_size(struct block_device *bdev) 1125 { 1126 return bdev->bd_block_size; 1127 } 1128 1129 static inline bool queue_flush_queueable(struct request_queue *q) 1130 { 1131 return !q->flush_not_queueable; 1132 } 1133 1134 typedef struct {struct page *v;} Sector; 1135 1136 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); 1137 1138 static inline void put_dev_sector(Sector p) 1139 { 1140 page_cache_release(p.v); 1141 } 1142 1143 struct work_struct; 1144 int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); 1145 1146 #ifdef CONFIG_BLK_CGROUP 1147 /* 1148 * This should not be using sched_clock(). A real patch is in progress 1149 * to fix this up, until that is in place we need to disable preemption 1150 * around sched_clock() in this function and set_io_start_time_ns(). 1151 */ 1152 static inline void set_start_time_ns(struct request *req) 1153 { 1154 preempt_disable(); 1155 req->start_time_ns = sched_clock(); 1156 preempt_enable(); 1157 } 1158 1159 static inline void set_io_start_time_ns(struct request *req) 1160 { 1161 preempt_disable(); 1162 req->io_start_time_ns = sched_clock(); 1163 preempt_enable(); 1164 } 1165 1166 static inline uint64_t rq_start_time_ns(struct request *req) 1167 { 1168 return req->start_time_ns; 1169 } 1170 1171 static inline uint64_t rq_io_start_time_ns(struct request *req) 1172 { 1173 return req->io_start_time_ns; 1174 } 1175 #else 1176 static inline void set_start_time_ns(struct request *req) {} 1177 static inline void set_io_start_time_ns(struct request *req) {} 1178 static inline uint64_t rq_start_time_ns(struct request *req) 1179 { 1180 return 0; 1181 } 1182 static inline uint64_t rq_io_start_time_ns(struct request *req) 1183 { 1184 return 0; 1185 } 1186 #endif 1187 1188 #ifdef CONFIG_BLK_DEV_THROTTLING 1189 extern int blk_throtl_init(struct request_queue *q); 1190 extern void blk_throtl_exit(struct request_queue *q); 1191 extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); 1192 #else /* CONFIG_BLK_DEV_THROTTLING */ 1193 static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) 1194 { 1195 return 0; 1196 } 1197 1198 static inline int blk_throtl_init(struct request_queue *q) { return 0; } 1199 static inline int blk_throtl_exit(struct request_queue *q) { return 0; } 1200 #endif /* CONFIG_BLK_DEV_THROTTLING */ 1201 1202 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1203 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1204 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1205 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1206 1207 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1208 1209 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ 1210 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ 1211 1212 struct blk_integrity_exchg { 1213 void *prot_buf; 1214 void *data_buf; 1215 sector_t sector; 1216 unsigned int data_size; 1217 unsigned short sector_size; 1218 const char *disk_name; 1219 }; 1220 1221 typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); 1222 typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); 1223 typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); 1224 typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); 1225 1226 struct blk_integrity { 1227 integrity_gen_fn *generate_fn; 1228 integrity_vrfy_fn *verify_fn; 1229 integrity_set_tag_fn *set_tag_fn; 1230 integrity_get_tag_fn *get_tag_fn; 1231 1232 unsigned short flags; 1233 unsigned short tuple_size; 1234 unsigned short sector_size; 1235 unsigned short tag_size; 1236 1237 const char *name; 1238 1239 struct kobject kobj; 1240 }; 1241 1242 extern bool blk_integrity_is_initialized(struct gendisk *); 1243 extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); 1244 extern void blk_integrity_unregister(struct gendisk *); 1245 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1246 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1247 struct scatterlist *); 1248 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1249 extern int blk_integrity_merge_rq(struct request_queue *, struct request *, 1250 struct request *); 1251 extern int blk_integrity_merge_bio(struct request_queue *, struct request *, 1252 struct bio *); 1253 1254 static inline 1255 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1256 { 1257 return bdev->bd_disk->integrity; 1258 } 1259 1260 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1261 { 1262 return disk->integrity; 1263 } 1264 1265 static inline int blk_integrity_rq(struct request *rq) 1266 { 1267 if (rq->bio == NULL) 1268 return 0; 1269 1270 return bio_integrity(rq->bio); 1271 } 1272 1273 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1274 unsigned int segs) 1275 { 1276 q->limits.max_integrity_segments = segs; 1277 } 1278 1279 static inline unsigned short 1280 queue_max_integrity_segments(struct request_queue *q) 1281 { 1282 return q->limits.max_integrity_segments; 1283 } 1284 1285 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1286 1287 #define blk_integrity_rq(rq) (0) 1288 #define blk_rq_count_integrity_sg(a, b) (0) 1289 #define blk_rq_map_integrity_sg(a, b, c) (0) 1290 #define bdev_get_integrity(a) (0) 1291 #define blk_get_integrity(a) (0) 1292 #define blk_integrity_compare(a, b) (0) 1293 #define blk_integrity_register(a, b) (0) 1294 #define blk_integrity_unregister(a) do { } while (0) 1295 #define blk_queue_max_integrity_segments(a, b) do { } while (0) 1296 #define queue_max_integrity_segments(a) (0) 1297 #define blk_integrity_merge_rq(a, b, c) (0) 1298 #define blk_integrity_merge_bio(a, b, c) (0) 1299 #define blk_integrity_is_initialized(a) (0) 1300 1301 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1302 1303 struct block_device_operations { 1304 int (*open) (struct block_device *, fmode_t); 1305 int (*release) (struct gendisk *, fmode_t); 1306 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1307 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1308 int (*direct_access) (struct block_device *, sector_t, 1309 void **, unsigned long *); 1310 unsigned int (*check_events) (struct gendisk *disk, 1311 unsigned int clearing); 1312 /* ->media_changed() is DEPRECATED, use ->check_events() instead */ 1313 int (*media_changed) (struct gendisk *); 1314 void (*unlock_native_capacity) (struct gendisk *); 1315 int (*revalidate_disk) (struct gendisk *); 1316 int (*getgeo)(struct block_device *, struct hd_geometry *); 1317 /* this callback is with swap_lock and sometimes page table lock held */ 1318 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1319 struct module *owner; 1320 }; 1321 1322 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1323 unsigned long); 1324 #else /* CONFIG_BLOCK */ 1325 /* 1326 * stubs for when the block layer is configured out 1327 */ 1328 #define buffer_heads_over_limit 0 1329 1330 static inline long nr_blockdev_pages(void) 1331 { 1332 return 0; 1333 } 1334 1335 struct blk_plug { 1336 }; 1337 1338 static inline void blk_start_plug(struct blk_plug *plug) 1339 { 1340 } 1341 1342 static inline void blk_finish_plug(struct blk_plug *plug) 1343 { 1344 } 1345 1346 static inline void blk_flush_plug(struct task_struct *task) 1347 { 1348 } 1349 1350 static inline void blk_schedule_flush_plug(struct task_struct *task) 1351 { 1352 } 1353 1354 1355 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1356 { 1357 return false; 1358 } 1359 1360 #endif /* CONFIG_BLOCK */ 1361 1362 #endif 1363