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 }; 86 87 /* 88 * request type modified bits. first four bits match BIO_RW* bits, important 89 */ 90 enum rq_flag_bits { 91 __REQ_RW, /* not set, read. set, write */ 92 __REQ_FAILFAST_DEV, /* no driver retries of device errors */ 93 __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ 94 __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ 95 /* above flags must match BIO_RW_* */ 96 __REQ_DISCARD, /* request to discard sectors */ 97 __REQ_SORTED, /* elevator knows about this request */ 98 __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ 99 __REQ_HARDBARRIER, /* may not be passed by drive either */ 100 __REQ_FUA, /* forced unit access */ 101 __REQ_NOMERGE, /* don't touch this for merging */ 102 __REQ_STARTED, /* drive already may have started this one */ 103 __REQ_DONTPREP, /* don't call prep for this one */ 104 __REQ_QUEUED, /* uses queueing */ 105 __REQ_ELVPRIV, /* elevator private data attached */ 106 __REQ_FAILED, /* set if the request failed */ 107 __REQ_QUIET, /* don't worry about errors */ 108 __REQ_PREEMPT, /* set for "ide_preempt" requests */ 109 __REQ_ORDERED_COLOR, /* is before or after barrier */ 110 __REQ_RW_SYNC, /* request is sync (sync write or read) */ 111 __REQ_ALLOCED, /* request came from our alloc pool */ 112 __REQ_RW_META, /* metadata io request */ 113 __REQ_COPY_USER, /* contains copies of user pages */ 114 __REQ_INTEGRITY, /* integrity metadata has been remapped */ 115 __REQ_NOIDLE, /* Don't anticipate more IO after this one */ 116 __REQ_IO_STAT, /* account I/O stat */ 117 __REQ_MIXED_MERGE, /* merge of different types, fail separately */ 118 __REQ_NR_BITS, /* stops here */ 119 }; 120 121 #define REQ_RW (1 << __REQ_RW) 122 #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) 123 #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) 124 #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) 125 #define REQ_DISCARD (1 << __REQ_DISCARD) 126 #define REQ_SORTED (1 << __REQ_SORTED) 127 #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) 128 #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) 129 #define REQ_FUA (1 << __REQ_FUA) 130 #define REQ_NOMERGE (1 << __REQ_NOMERGE) 131 #define REQ_STARTED (1 << __REQ_STARTED) 132 #define REQ_DONTPREP (1 << __REQ_DONTPREP) 133 #define REQ_QUEUED (1 << __REQ_QUEUED) 134 #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) 135 #define REQ_FAILED (1 << __REQ_FAILED) 136 #define REQ_QUIET (1 << __REQ_QUIET) 137 #define REQ_PREEMPT (1 << __REQ_PREEMPT) 138 #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) 139 #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) 140 #define REQ_ALLOCED (1 << __REQ_ALLOCED) 141 #define REQ_RW_META (1 << __REQ_RW_META) 142 #define REQ_COPY_USER (1 << __REQ_COPY_USER) 143 #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) 144 #define REQ_NOIDLE (1 << __REQ_NOIDLE) 145 #define REQ_IO_STAT (1 << __REQ_IO_STAT) 146 #define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE) 147 148 #define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \ 149 REQ_FAILFAST_DRIVER) 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 *); 263 264 struct bio_vec; 265 struct bvec_merge_data { 266 struct block_device *bi_bdev; 267 sector_t bi_sector; 268 unsigned bi_size; 269 unsigned long bi_rw; 270 }; 271 typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, 272 struct bio_vec *); 273 typedef void (prepare_flush_fn) (struct request_queue *, struct request *); 274 typedef void (softirq_done_fn)(struct request *); 275 typedef int (dma_drain_needed_fn)(struct request *); 276 typedef int (lld_busy_fn) (struct request_queue *q); 277 278 enum blk_eh_timer_return { 279 BLK_EH_NOT_HANDLED, 280 BLK_EH_HANDLED, 281 BLK_EH_RESET_TIMER, 282 }; 283 284 typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); 285 286 enum blk_queue_state { 287 Queue_down, 288 Queue_up, 289 }; 290 291 struct blk_queue_tag { 292 struct request **tag_index; /* map of busy tags */ 293 unsigned long *tag_map; /* bit map of free/busy tags */ 294 int busy; /* current depth */ 295 int max_depth; /* what we will send to device */ 296 int real_max_depth; /* what the array can hold */ 297 atomic_t refcnt; /* map can be shared */ 298 }; 299 300 #define BLK_SCSI_MAX_CMDS (256) 301 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 302 303 struct queue_limits { 304 unsigned long bounce_pfn; 305 unsigned long seg_boundary_mask; 306 307 unsigned int max_hw_sectors; 308 unsigned int max_sectors; 309 unsigned int max_segment_size; 310 unsigned int physical_block_size; 311 unsigned int alignment_offset; 312 unsigned int io_min; 313 unsigned int io_opt; 314 unsigned int max_discard_sectors; 315 316 unsigned short logical_block_size; 317 unsigned short max_hw_segments; 318 unsigned short max_phys_segments; 319 320 unsigned char misaligned; 321 unsigned char no_cluster; 322 }; 323 324 struct request_queue 325 { 326 /* 327 * Together with queue_head for cacheline sharing 328 */ 329 struct list_head queue_head; 330 struct request *last_merge; 331 struct elevator_queue *elevator; 332 333 /* 334 * the queue request freelist, one for reads and one for writes 335 */ 336 struct request_list rq; 337 338 request_fn_proc *request_fn; 339 make_request_fn *make_request_fn; 340 prep_rq_fn *prep_rq_fn; 341 unplug_fn *unplug_fn; 342 merge_bvec_fn *merge_bvec_fn; 343 prepare_flush_fn *prepare_flush_fn; 344 softirq_done_fn *softirq_done_fn; 345 rq_timed_out_fn *rq_timed_out_fn; 346 dma_drain_needed_fn *dma_drain_needed; 347 lld_busy_fn *lld_busy_fn; 348 349 /* 350 * Dispatch queue sorting 351 */ 352 sector_t end_sector; 353 struct request *boundary_rq; 354 355 /* 356 * Auto-unplugging state 357 */ 358 struct timer_list unplug_timer; 359 int unplug_thresh; /* After this many requests */ 360 unsigned long unplug_delay; /* After this many jiffies */ 361 struct work_struct unplug_work; 362 363 struct backing_dev_info backing_dev_info; 364 365 /* 366 * The queue owner gets to use this for whatever they like. 367 * ll_rw_blk doesn't touch it. 368 */ 369 void *queuedata; 370 371 /* 372 * queue needs bounce pages for pages above this limit 373 */ 374 gfp_t bounce_gfp; 375 376 /* 377 * various queue flags, see QUEUE_* below 378 */ 379 unsigned long queue_flags; 380 381 /* 382 * protects queue structures from reentrancy. ->__queue_lock should 383 * _never_ be used directly, it is queue private. always use 384 * ->queue_lock. 385 */ 386 spinlock_t __queue_lock; 387 spinlock_t *queue_lock; 388 389 /* 390 * queue kobject 391 */ 392 struct kobject kobj; 393 394 /* 395 * queue settings 396 */ 397 unsigned long nr_requests; /* Max # of requests */ 398 unsigned int nr_congestion_on; 399 unsigned int nr_congestion_off; 400 unsigned int nr_batching; 401 402 void *dma_drain_buffer; 403 unsigned int dma_drain_size; 404 unsigned int dma_pad_mask; 405 unsigned int dma_alignment; 406 407 struct blk_queue_tag *queue_tags; 408 struct list_head tag_busy_list; 409 410 unsigned int nr_sorted; 411 unsigned int in_flight[2]; 412 413 unsigned int rq_timeout; 414 struct timer_list timeout; 415 struct list_head timeout_list; 416 417 struct queue_limits limits; 418 419 /* 420 * sg stuff 421 */ 422 unsigned int sg_timeout; 423 unsigned int sg_reserved_size; 424 int node; 425 #ifdef CONFIG_BLK_DEV_IO_TRACE 426 struct blk_trace *blk_trace; 427 #endif 428 /* 429 * reserved for flush operations 430 */ 431 unsigned int ordered, next_ordered, ordseq; 432 int orderr, ordcolor; 433 struct request pre_flush_rq, bar_rq, post_flush_rq; 434 struct request *orig_bar_rq; 435 436 struct mutex sysfs_lock; 437 438 #if defined(CONFIG_BLK_DEV_BSG) 439 struct bsg_class_device bsg_dev; 440 #endif 441 }; 442 443 #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ 444 #define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */ 445 #define QUEUE_FLAG_STOPPED 2 /* queue is stopped */ 446 #define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */ 447 #define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */ 448 #define QUEUE_FLAG_DEAD 5 /* queue being torn down */ 449 #define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */ 450 #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ 451 #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ 452 #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ 453 #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ 454 #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ 455 #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ 456 #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ 457 #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ 458 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 459 #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ 460 #define QUEUE_FLAG_CQ 16 /* hardware does queuing */ 461 #define QUEUE_FLAG_DISCARD 17 /* supports DISCARD */ 462 463 #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 464 (1 << QUEUE_FLAG_CLUSTER) | \ 465 (1 << QUEUE_FLAG_STACKABLE) | \ 466 (1 << QUEUE_FLAG_SAME_COMP)) 467 468 static inline int queue_is_locked(struct request_queue *q) 469 { 470 #ifdef CONFIG_SMP 471 spinlock_t *lock = q->queue_lock; 472 return lock && spin_is_locked(lock); 473 #else 474 return 1; 475 #endif 476 } 477 478 static inline void queue_flag_set_unlocked(unsigned int flag, 479 struct request_queue *q) 480 { 481 __set_bit(flag, &q->queue_flags); 482 } 483 484 static inline int queue_flag_test_and_clear(unsigned int flag, 485 struct request_queue *q) 486 { 487 WARN_ON_ONCE(!queue_is_locked(q)); 488 489 if (test_bit(flag, &q->queue_flags)) { 490 __clear_bit(flag, &q->queue_flags); 491 return 1; 492 } 493 494 return 0; 495 } 496 497 static inline int queue_flag_test_and_set(unsigned int flag, 498 struct request_queue *q) 499 { 500 WARN_ON_ONCE(!queue_is_locked(q)); 501 502 if (!test_bit(flag, &q->queue_flags)) { 503 __set_bit(flag, &q->queue_flags); 504 return 0; 505 } 506 507 return 1; 508 } 509 510 static inline void queue_flag_set(unsigned int flag, struct request_queue *q) 511 { 512 WARN_ON_ONCE(!queue_is_locked(q)); 513 __set_bit(flag, &q->queue_flags); 514 } 515 516 static inline void queue_flag_clear_unlocked(unsigned int flag, 517 struct request_queue *q) 518 { 519 __clear_bit(flag, &q->queue_flags); 520 } 521 522 static inline int queue_in_flight(struct request_queue *q) 523 { 524 return q->in_flight[0] + q->in_flight[1]; 525 } 526 527 static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) 528 { 529 WARN_ON_ONCE(!queue_is_locked(q)); 530 __clear_bit(flag, &q->queue_flags); 531 } 532 533 enum { 534 /* 535 * Hardbarrier is supported with one of the following methods. 536 * 537 * NONE : hardbarrier unsupported 538 * DRAIN : ordering by draining is enough 539 * DRAIN_FLUSH : ordering by draining w/ pre and post flushes 540 * DRAIN_FUA : ordering by draining w/ pre flush and FUA write 541 * TAG : ordering by tag is enough 542 * TAG_FLUSH : ordering by tag w/ pre and post flushes 543 * TAG_FUA : ordering by tag w/ pre flush and FUA write 544 */ 545 QUEUE_ORDERED_BY_DRAIN = 0x01, 546 QUEUE_ORDERED_BY_TAG = 0x02, 547 QUEUE_ORDERED_DO_PREFLUSH = 0x10, 548 QUEUE_ORDERED_DO_BAR = 0x20, 549 QUEUE_ORDERED_DO_POSTFLUSH = 0x40, 550 QUEUE_ORDERED_DO_FUA = 0x80, 551 552 QUEUE_ORDERED_NONE = 0x00, 553 554 QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | 555 QUEUE_ORDERED_DO_BAR, 556 QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | 557 QUEUE_ORDERED_DO_PREFLUSH | 558 QUEUE_ORDERED_DO_POSTFLUSH, 559 QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | 560 QUEUE_ORDERED_DO_PREFLUSH | 561 QUEUE_ORDERED_DO_FUA, 562 563 QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | 564 QUEUE_ORDERED_DO_BAR, 565 QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | 566 QUEUE_ORDERED_DO_PREFLUSH | 567 QUEUE_ORDERED_DO_POSTFLUSH, 568 QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | 569 QUEUE_ORDERED_DO_PREFLUSH | 570 QUEUE_ORDERED_DO_FUA, 571 572 /* 573 * Ordered operation sequence 574 */ 575 QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ 576 QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ 577 QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ 578 QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ 579 QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ 580 QUEUE_ORDSEQ_DONE = 0x20, 581 }; 582 583 #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(q)->queue_flags) 584 #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) 585 #define blk_queue_queuing(q) test_bit(QUEUE_FLAG_CQ, &(q)->queue_flags) 586 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 587 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 588 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 589 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 590 #define blk_queue_flushing(q) ((q)->ordseq) 591 #define blk_queue_stackable(q) \ 592 test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) 593 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(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_max_discard_sectors(struct request_queue *q, 933 unsigned int max_discard_sectors); 934 extern void blk_queue_logical_block_size(struct request_queue *, unsigned short); 935 extern void blk_queue_physical_block_size(struct request_queue *, unsigned short); 936 extern void blk_queue_alignment_offset(struct request_queue *q, 937 unsigned int alignment); 938 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 939 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 940 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 941 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 942 extern void blk_set_default_limits(struct queue_limits *lim); 943 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 944 sector_t offset); 945 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 946 sector_t offset); 947 extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b); 948 extern void blk_queue_dma_pad(struct request_queue *, unsigned int); 949 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 950 extern int blk_queue_dma_drain(struct request_queue *q, 951 dma_drain_needed_fn *dma_drain_needed, 952 void *buf, unsigned int size); 953 extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn); 954 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 955 extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn); 956 extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *); 957 extern void blk_queue_dma_alignment(struct request_queue *, int); 958 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 959 extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *); 960 extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *); 961 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 962 extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); 963 extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); 964 extern bool blk_do_ordered(struct request_queue *, struct request **); 965 extern unsigned blk_ordered_cur_seq(struct request_queue *); 966 extern unsigned blk_ordered_req_seq(struct request *); 967 extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); 968 969 extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); 970 extern void blk_dump_rq_flags(struct request *, char *); 971 extern void generic_unplug_device(struct request_queue *); 972 extern long nr_blockdev_pages(void); 973 974 int blk_get_queue(struct request_queue *); 975 struct request_queue *blk_alloc_queue(gfp_t); 976 struct request_queue *blk_alloc_queue_node(gfp_t, int); 977 extern void blk_put_queue(struct request_queue *); 978 979 /* 980 * tag stuff 981 */ 982 #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) 983 extern int blk_queue_start_tag(struct request_queue *, struct request *); 984 extern struct request *blk_queue_find_tag(struct request_queue *, int); 985 extern void blk_queue_end_tag(struct request_queue *, struct request *); 986 extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *); 987 extern void blk_queue_free_tags(struct request_queue *); 988 extern int blk_queue_resize_tags(struct request_queue *, int); 989 extern void blk_queue_invalidate_tags(struct request_queue *); 990 extern struct blk_queue_tag *blk_init_tags(int); 991 extern void blk_free_tags(struct blk_queue_tag *); 992 993 static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt, 994 int tag) 995 { 996 if (unlikely(bqt == NULL || tag >= bqt->real_max_depth)) 997 return NULL; 998 return bqt->tag_index[tag]; 999 } 1000 1001 extern int blkdev_issue_flush(struct block_device *, sector_t *); 1002 #define DISCARD_FL_WAIT 0x01 /* wait for completion */ 1003 #define DISCARD_FL_BARRIER 0x02 /* issue DISCARD_BARRIER request */ 1004 extern int blkdev_issue_discard(struct block_device *, sector_t sector, 1005 sector_t nr_sects, gfp_t, int flags); 1006 1007 static inline int sb_issue_discard(struct super_block *sb, 1008 sector_t block, sector_t nr_blocks) 1009 { 1010 block <<= (sb->s_blocksize_bits - 9); 1011 nr_blocks <<= (sb->s_blocksize_bits - 9); 1012 return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL, 1013 DISCARD_FL_BARRIER); 1014 } 1015 1016 extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); 1017 1018 #define MAX_PHYS_SEGMENTS 128 1019 #define MAX_HW_SEGMENTS 128 1020 #define SAFE_MAX_SECTORS 255 1021 #define BLK_DEF_MAX_SECTORS 1024 1022 1023 #define MAX_SEGMENT_SIZE 65536 1024 1025 #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL 1026 1027 #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) 1028 1029 static inline unsigned long queue_bounce_pfn(struct request_queue *q) 1030 { 1031 return q->limits.bounce_pfn; 1032 } 1033 1034 static inline unsigned long queue_segment_boundary(struct request_queue *q) 1035 { 1036 return q->limits.seg_boundary_mask; 1037 } 1038 1039 static inline unsigned int queue_max_sectors(struct request_queue *q) 1040 { 1041 return q->limits.max_sectors; 1042 } 1043 1044 static inline unsigned int queue_max_hw_sectors(struct request_queue *q) 1045 { 1046 return q->limits.max_hw_sectors; 1047 } 1048 1049 static inline unsigned short queue_max_hw_segments(struct request_queue *q) 1050 { 1051 return q->limits.max_hw_segments; 1052 } 1053 1054 static inline unsigned short queue_max_phys_segments(struct request_queue *q) 1055 { 1056 return q->limits.max_phys_segments; 1057 } 1058 1059 static inline unsigned int queue_max_segment_size(struct request_queue *q) 1060 { 1061 return q->limits.max_segment_size; 1062 } 1063 1064 static inline unsigned short queue_logical_block_size(struct request_queue *q) 1065 { 1066 int retval = 512; 1067 1068 if (q && q->limits.logical_block_size) 1069 retval = q->limits.logical_block_size; 1070 1071 return retval; 1072 } 1073 1074 static inline unsigned short bdev_logical_block_size(struct block_device *bdev) 1075 { 1076 return queue_logical_block_size(bdev_get_queue(bdev)); 1077 } 1078 1079 static inline unsigned int queue_physical_block_size(struct request_queue *q) 1080 { 1081 return q->limits.physical_block_size; 1082 } 1083 1084 static inline int bdev_physical_block_size(struct block_device *bdev) 1085 { 1086 return queue_physical_block_size(bdev_get_queue(bdev)); 1087 } 1088 1089 static inline unsigned int queue_io_min(struct request_queue *q) 1090 { 1091 return q->limits.io_min; 1092 } 1093 1094 static inline int bdev_io_min(struct block_device *bdev) 1095 { 1096 return queue_io_min(bdev_get_queue(bdev)); 1097 } 1098 1099 static inline unsigned int queue_io_opt(struct request_queue *q) 1100 { 1101 return q->limits.io_opt; 1102 } 1103 1104 static inline int bdev_io_opt(struct block_device *bdev) 1105 { 1106 return queue_io_opt(bdev_get_queue(bdev)); 1107 } 1108 1109 static inline int queue_alignment_offset(struct request_queue *q) 1110 { 1111 if (q->limits.misaligned) 1112 return -1; 1113 1114 return q->limits.alignment_offset; 1115 } 1116 1117 static inline int queue_sector_alignment_offset(struct request_queue *q, 1118 sector_t sector) 1119 { 1120 return ((sector << 9) - q->limits.alignment_offset) 1121 & (q->limits.io_min - 1); 1122 } 1123 1124 static inline int bdev_alignment_offset(struct block_device *bdev) 1125 { 1126 struct request_queue *q = bdev_get_queue(bdev); 1127 1128 if (q->limits.misaligned) 1129 return -1; 1130 1131 if (bdev != bdev->bd_contains) 1132 return bdev->bd_part->alignment_offset; 1133 1134 return q->limits.alignment_offset; 1135 } 1136 1137 static inline int queue_dma_alignment(struct request_queue *q) 1138 { 1139 return q ? q->dma_alignment : 511; 1140 } 1141 1142 static inline int blk_rq_aligned(struct request_queue *q, void *addr, 1143 unsigned int len) 1144 { 1145 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1146 return !((unsigned long)addr & alignment) && !(len & alignment); 1147 } 1148 1149 /* assumes size > 256 */ 1150 static inline unsigned int blksize_bits(unsigned int size) 1151 { 1152 unsigned int bits = 8; 1153 do { 1154 bits++; 1155 size >>= 1; 1156 } while (size > 256); 1157 return bits; 1158 } 1159 1160 static inline unsigned int block_size(struct block_device *bdev) 1161 { 1162 return bdev->bd_block_size; 1163 } 1164 1165 typedef struct {struct page *v;} Sector; 1166 1167 unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *); 1168 1169 static inline void put_dev_sector(Sector p) 1170 { 1171 page_cache_release(p.v); 1172 } 1173 1174 struct work_struct; 1175 int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); 1176 1177 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1178 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1179 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1180 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1181 1182 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1183 1184 #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ 1185 #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ 1186 1187 struct blk_integrity_exchg { 1188 void *prot_buf; 1189 void *data_buf; 1190 sector_t sector; 1191 unsigned int data_size; 1192 unsigned short sector_size; 1193 const char *disk_name; 1194 }; 1195 1196 typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); 1197 typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); 1198 typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); 1199 typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); 1200 1201 struct blk_integrity { 1202 integrity_gen_fn *generate_fn; 1203 integrity_vrfy_fn *verify_fn; 1204 integrity_set_tag_fn *set_tag_fn; 1205 integrity_get_tag_fn *get_tag_fn; 1206 1207 unsigned short flags; 1208 unsigned short tuple_size; 1209 unsigned short sector_size; 1210 unsigned short tag_size; 1211 1212 const char *name; 1213 1214 struct kobject kobj; 1215 }; 1216 1217 extern int blk_integrity_register(struct gendisk *, struct blk_integrity *); 1218 extern void blk_integrity_unregister(struct gendisk *); 1219 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1220 extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *); 1221 extern int blk_rq_count_integrity_sg(struct request *); 1222 1223 static inline 1224 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1225 { 1226 return bdev->bd_disk->integrity; 1227 } 1228 1229 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1230 { 1231 return disk->integrity; 1232 } 1233 1234 static inline int blk_integrity_rq(struct request *rq) 1235 { 1236 if (rq->bio == NULL) 1237 return 0; 1238 1239 return bio_integrity(rq->bio); 1240 } 1241 1242 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1243 1244 #define blk_integrity_rq(rq) (0) 1245 #define blk_rq_count_integrity_sg(a) (0) 1246 #define blk_rq_map_integrity_sg(a, b) (0) 1247 #define bdev_get_integrity(a) (0) 1248 #define blk_get_integrity(a) (0) 1249 #define blk_integrity_compare(a, b) (0) 1250 #define blk_integrity_register(a, b) (0) 1251 #define blk_integrity_unregister(a) do { } while (0); 1252 1253 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1254 1255 struct block_device_operations { 1256 int (*open) (struct block_device *, fmode_t); 1257 int (*release) (struct gendisk *, fmode_t); 1258 int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1259 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1260 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1261 int (*direct_access) (struct block_device *, sector_t, 1262 void **, unsigned long *); 1263 int (*media_changed) (struct gendisk *); 1264 unsigned long long (*set_capacity) (struct gendisk *, 1265 unsigned long long); 1266 int (*revalidate_disk) (struct gendisk *); 1267 int (*getgeo)(struct block_device *, struct hd_geometry *); 1268 struct module *owner; 1269 }; 1270 1271 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1272 unsigned long); 1273 #else /* CONFIG_BLOCK */ 1274 /* 1275 * stubs for when the block layer is configured out 1276 */ 1277 #define buffer_heads_over_limit 0 1278 1279 static inline long nr_blockdev_pages(void) 1280 { 1281 return 0; 1282 } 1283 1284 #endif /* CONFIG_BLOCK */ 1285 1286 #endif 1287