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