1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_BLKDEV_H 3 #define _LINUX_BLKDEV_H 4 5 #include <linux/sched.h> 6 #include <linux/sched/clock.h> 7 #include <linux/major.h> 8 #include <linux/genhd.h> 9 #include <linux/list.h> 10 #include <linux/llist.h> 11 #include <linux/timer.h> 12 #include <linux/workqueue.h> 13 #include <linux/pagemap.h> 14 #include <linux/backing-dev-defs.h> 15 #include <linux/wait.h> 16 #include <linux/mempool.h> 17 #include <linux/pfn.h> 18 #include <linux/bio.h> 19 #include <linux/stringify.h> 20 #include <linux/gfp.h> 21 #include <linux/bsg.h> 22 #include <linux/smp.h> 23 #include <linux/rcupdate.h> 24 #include <linux/percpu-refcount.h> 25 #include <linux/scatterlist.h> 26 #include <linux/blkzoned.h> 27 28 struct module; 29 struct scsi_ioctl_command; 30 31 struct request_queue; 32 struct elevator_queue; 33 struct blk_trace; 34 struct request; 35 struct sg_io_hdr; 36 struct bsg_job; 37 struct blkcg_gq; 38 struct blk_flush_queue; 39 struct pr_ops; 40 struct rq_qos; 41 struct blk_queue_stats; 42 struct blk_stat_callback; 43 struct blk_keyslot_manager; 44 45 #define BLKDEV_MIN_RQ 4 46 #define BLKDEV_MAX_RQ 128 /* Default maximum */ 47 48 /* Must be consistent with blk_mq_poll_stats_bkt() */ 49 #define BLK_MQ_POLL_STATS_BKTS 16 50 51 /* Doing classic polling */ 52 #define BLK_MQ_POLL_CLASSIC -1 53 54 /* 55 * Maximum number of blkcg policies allowed to be registered concurrently. 56 * Defined here to simplify include dependency. 57 */ 58 #define BLKCG_MAX_POLS 5 59 60 typedef void (rq_end_io_fn)(struct request *, blk_status_t); 61 62 /* 63 * request flags */ 64 typedef __u32 __bitwise req_flags_t; 65 66 /* elevator knows about this request */ 67 #define RQF_SORTED ((__force req_flags_t)(1 << 0)) 68 /* drive already may have started this one */ 69 #define RQF_STARTED ((__force req_flags_t)(1 << 1)) 70 /* may not be passed by ioscheduler */ 71 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) 72 /* request for flush sequence */ 73 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) 74 /* merge of different types, fail separately */ 75 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) 76 /* track inflight for MQ */ 77 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) 78 /* don't call prep for this one */ 79 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) 80 /* set for "ide_preempt" requests and also for requests for which the SCSI 81 "quiesce" state must be ignored. */ 82 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) 83 /* vaguely specified driver internal error. Ignored by the block layer */ 84 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 85 /* don't warn about errors */ 86 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 87 /* elevator private data attached */ 88 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 89 /* account into disk and partition IO statistics */ 90 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 91 /* request came from our alloc pool */ 92 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) 93 /* runtime pm request */ 94 #define RQF_PM ((__force req_flags_t)(1 << 15)) 95 /* on IO scheduler merge hash */ 96 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 97 /* track IO completion time */ 98 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 99 /* Look at ->special_vec for the actual data payload instead of the 100 bio chain. */ 101 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 102 /* The per-zone write lock is held for this request */ 103 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 104 /* already slept for hybrid poll */ 105 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 106 /* ->timeout has been called, don't expire again */ 107 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 108 109 /* flags that prevent us from merging requests: */ 110 #define RQF_NOMERGE_FLAGS \ 111 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 112 113 /* 114 * Request state for blk-mq. 115 */ 116 enum mq_rq_state { 117 MQ_RQ_IDLE = 0, 118 MQ_RQ_IN_FLIGHT = 1, 119 MQ_RQ_COMPLETE = 2, 120 }; 121 122 /* 123 * Try to put the fields that are referenced together in the same cacheline. 124 * 125 * If you modify this structure, make sure to update blk_rq_init() and 126 * especially blk_mq_rq_ctx_init() to take care of the added fields. 127 */ 128 struct request { 129 struct request_queue *q; 130 struct blk_mq_ctx *mq_ctx; 131 struct blk_mq_hw_ctx *mq_hctx; 132 133 unsigned int cmd_flags; /* op and common flags */ 134 req_flags_t rq_flags; 135 136 int tag; 137 int internal_tag; 138 139 /* the following two fields are internal, NEVER access directly */ 140 unsigned int __data_len; /* total data len */ 141 sector_t __sector; /* sector cursor */ 142 143 struct bio *bio; 144 struct bio *biotail; 145 146 struct list_head queuelist; 147 148 /* 149 * The hash is used inside the scheduler, and killed once the 150 * request reaches the dispatch list. The ipi_list is only used 151 * to queue the request for softirq completion, which is long 152 * after the request has been unhashed (and even removed from 153 * the dispatch list). 154 */ 155 union { 156 struct hlist_node hash; /* merge hash */ 157 struct list_head ipi_list; 158 }; 159 160 /* 161 * The rb_node is only used inside the io scheduler, requests 162 * are pruned when moved to the dispatch queue. So let the 163 * completion_data share space with the rb_node. 164 */ 165 union { 166 struct rb_node rb_node; /* sort/lookup */ 167 struct bio_vec special_vec; 168 void *completion_data; 169 int error_count; /* for legacy drivers, don't use */ 170 }; 171 172 /* 173 * Three pointers are available for the IO schedulers, if they need 174 * more they have to dynamically allocate it. Flush requests are 175 * never put on the IO scheduler. So let the flush fields share 176 * space with the elevator data. 177 */ 178 union { 179 struct { 180 struct io_cq *icq; 181 void *priv[2]; 182 } elv; 183 184 struct { 185 unsigned int seq; 186 struct list_head list; 187 rq_end_io_fn *saved_end_io; 188 } flush; 189 }; 190 191 struct gendisk *rq_disk; 192 struct hd_struct *part; 193 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 194 /* Time that the first bio started allocating this request. */ 195 u64 alloc_time_ns; 196 #endif 197 /* Time that this request was allocated for this IO. */ 198 u64 start_time_ns; 199 /* Time that I/O was submitted to the device. */ 200 u64 io_start_time_ns; 201 202 #ifdef CONFIG_BLK_WBT 203 unsigned short wbt_flags; 204 #endif 205 /* 206 * rq sectors used for blk stats. It has the same value 207 * with blk_rq_sectors(rq), except that it never be zeroed 208 * by completion. 209 */ 210 unsigned short stats_sectors; 211 212 /* 213 * Number of scatter-gather DMA addr+len pairs after 214 * physical address coalescing is performed. 215 */ 216 unsigned short nr_phys_segments; 217 218 #if defined(CONFIG_BLK_DEV_INTEGRITY) 219 unsigned short nr_integrity_segments; 220 #endif 221 222 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 223 struct bio_crypt_ctx *crypt_ctx; 224 struct blk_ksm_keyslot *crypt_keyslot; 225 #endif 226 227 unsigned short write_hint; 228 unsigned short ioprio; 229 230 enum mq_rq_state state; 231 refcount_t ref; 232 233 unsigned int timeout; 234 unsigned long deadline; 235 236 union { 237 struct __call_single_data csd; 238 u64 fifo_time; 239 }; 240 241 /* 242 * completion callback. 243 */ 244 rq_end_io_fn *end_io; 245 void *end_io_data; 246 }; 247 248 static inline bool blk_op_is_scsi(unsigned int op) 249 { 250 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 251 } 252 253 static inline bool blk_op_is_private(unsigned int op) 254 { 255 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 256 } 257 258 static inline bool blk_rq_is_scsi(struct request *rq) 259 { 260 return blk_op_is_scsi(req_op(rq)); 261 } 262 263 static inline bool blk_rq_is_private(struct request *rq) 264 { 265 return blk_op_is_private(req_op(rq)); 266 } 267 268 static inline bool blk_rq_is_passthrough(struct request *rq) 269 { 270 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 271 } 272 273 static inline bool bio_is_passthrough(struct bio *bio) 274 { 275 unsigned op = bio_op(bio); 276 277 return blk_op_is_scsi(op) || blk_op_is_private(op); 278 } 279 280 static inline unsigned short req_get_ioprio(struct request *req) 281 { 282 return req->ioprio; 283 } 284 285 #include <linux/elevator.h> 286 287 struct blk_queue_ctx; 288 289 struct bio_vec; 290 291 enum blk_eh_timer_return { 292 BLK_EH_DONE, /* drivers has completed the command */ 293 BLK_EH_RESET_TIMER, /* reset timer and try again */ 294 }; 295 296 enum blk_queue_state { 297 Queue_down, 298 Queue_up, 299 }; 300 301 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ 302 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ 303 304 #define BLK_SCSI_MAX_CMDS (256) 305 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 306 307 /* 308 * Zoned block device models (zoned limit). 309 * 310 * Note: This needs to be ordered from the least to the most severe 311 * restrictions for the inheritance in blk_stack_limits() to work. 312 */ 313 enum blk_zoned_model { 314 BLK_ZONED_NONE = 0, /* Regular block device */ 315 BLK_ZONED_HA, /* Host-aware zoned block device */ 316 BLK_ZONED_HM, /* Host-managed zoned block device */ 317 }; 318 319 struct queue_limits { 320 unsigned long bounce_pfn; 321 unsigned long seg_boundary_mask; 322 unsigned long virt_boundary_mask; 323 324 unsigned int max_hw_sectors; 325 unsigned int max_dev_sectors; 326 unsigned int chunk_sectors; 327 unsigned int max_sectors; 328 unsigned int max_segment_size; 329 unsigned int physical_block_size; 330 unsigned int logical_block_size; 331 unsigned int alignment_offset; 332 unsigned int io_min; 333 unsigned int io_opt; 334 unsigned int max_discard_sectors; 335 unsigned int max_hw_discard_sectors; 336 unsigned int max_write_same_sectors; 337 unsigned int max_write_zeroes_sectors; 338 unsigned int max_zone_append_sectors; 339 unsigned int discard_granularity; 340 unsigned int discard_alignment; 341 342 unsigned short max_segments; 343 unsigned short max_integrity_segments; 344 unsigned short max_discard_segments; 345 346 unsigned char misaligned; 347 unsigned char discard_misaligned; 348 unsigned char raid_partial_stripes_expensive; 349 enum blk_zoned_model zoned; 350 }; 351 352 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 353 void *data); 354 355 #ifdef CONFIG_BLK_DEV_ZONED 356 357 #define BLK_ALL_ZONES ((unsigned int)-1) 358 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 359 unsigned int nr_zones, report_zones_cb cb, void *data); 360 unsigned int blkdev_nr_zones(struct gendisk *disk); 361 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, 362 sector_t sectors, sector_t nr_sectors, 363 gfp_t gfp_mask); 364 int blk_revalidate_disk_zones(struct gendisk *disk, 365 void (*update_driver_data)(struct gendisk *disk)); 366 367 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 368 unsigned int cmd, unsigned long arg); 369 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, 370 unsigned int cmd, unsigned long arg); 371 372 #else /* CONFIG_BLK_DEV_ZONED */ 373 374 static inline unsigned int blkdev_nr_zones(struct gendisk *disk) 375 { 376 return 0; 377 } 378 379 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 380 fmode_t mode, unsigned int cmd, 381 unsigned long arg) 382 { 383 return -ENOTTY; 384 } 385 386 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 387 fmode_t mode, unsigned int cmd, 388 unsigned long arg) 389 { 390 return -ENOTTY; 391 } 392 393 #endif /* CONFIG_BLK_DEV_ZONED */ 394 395 struct request_queue { 396 struct request *last_merge; 397 struct elevator_queue *elevator; 398 399 struct blk_queue_stats *stats; 400 struct rq_qos *rq_qos; 401 402 const struct blk_mq_ops *mq_ops; 403 404 /* sw queues */ 405 struct blk_mq_ctx __percpu *queue_ctx; 406 407 unsigned int queue_depth; 408 409 /* hw dispatch queues */ 410 struct blk_mq_hw_ctx **queue_hw_ctx; 411 unsigned int nr_hw_queues; 412 413 struct backing_dev_info *backing_dev_info; 414 415 /* 416 * The queue owner gets to use this for whatever they like. 417 * ll_rw_blk doesn't touch it. 418 */ 419 void *queuedata; 420 421 /* 422 * various queue flags, see QUEUE_* below 423 */ 424 unsigned long queue_flags; 425 /* 426 * Number of contexts that have called blk_set_pm_only(). If this 427 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are 428 * processed. 429 */ 430 atomic_t pm_only; 431 432 /* 433 * ida allocated id for this queue. Used to index queues from 434 * ioctx. 435 */ 436 int id; 437 438 /* 439 * queue needs bounce pages for pages above this limit 440 */ 441 gfp_t bounce_gfp; 442 443 spinlock_t queue_lock; 444 445 /* 446 * queue kobject 447 */ 448 struct kobject kobj; 449 450 /* 451 * mq queue kobject 452 */ 453 struct kobject *mq_kobj; 454 455 #ifdef CONFIG_BLK_DEV_INTEGRITY 456 struct blk_integrity integrity; 457 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 458 459 #ifdef CONFIG_PM 460 struct device *dev; 461 int rpm_status; 462 unsigned int nr_pending; 463 #endif 464 465 /* 466 * queue settings 467 */ 468 unsigned long nr_requests; /* Max # of requests */ 469 470 unsigned int dma_pad_mask; 471 unsigned int dma_alignment; 472 473 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 474 /* Inline crypto capabilities */ 475 struct blk_keyslot_manager *ksm; 476 #endif 477 478 unsigned int rq_timeout; 479 int poll_nsec; 480 481 struct blk_stat_callback *poll_cb; 482 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; 483 484 struct timer_list timeout; 485 struct work_struct timeout_work; 486 487 struct list_head icq_list; 488 #ifdef CONFIG_BLK_CGROUP 489 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 490 struct blkcg_gq *root_blkg; 491 struct list_head blkg_list; 492 #endif 493 494 struct queue_limits limits; 495 496 unsigned int required_elevator_features; 497 498 #ifdef CONFIG_BLK_DEV_ZONED 499 /* 500 * Zoned block device information for request dispatch control. 501 * nr_zones is the total number of zones of the device. This is always 502 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 503 * bits which indicates if a zone is conventional (bit set) or 504 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 505 * bits which indicates if a zone is write locked, that is, if a write 506 * request targeting the zone was dispatched. All three fields are 507 * initialized by the low level device driver (e.g. scsi/sd.c). 508 * Stacking drivers (device mappers) may or may not initialize 509 * these fields. 510 * 511 * Reads of this information must be protected with blk_queue_enter() / 512 * blk_queue_exit(). Modifying this information is only allowed while 513 * no requests are being processed. See also blk_mq_freeze_queue() and 514 * blk_mq_unfreeze_queue(). 515 */ 516 unsigned int nr_zones; 517 unsigned long *conv_zones_bitmap; 518 unsigned long *seq_zones_wlock; 519 unsigned int max_open_zones; 520 unsigned int max_active_zones; 521 #endif /* CONFIG_BLK_DEV_ZONED */ 522 523 /* 524 * sg stuff 525 */ 526 unsigned int sg_timeout; 527 unsigned int sg_reserved_size; 528 int node; 529 struct mutex debugfs_mutex; 530 #ifdef CONFIG_BLK_DEV_IO_TRACE 531 struct blk_trace __rcu *blk_trace; 532 #endif 533 /* 534 * for flush operations 535 */ 536 struct blk_flush_queue *fq; 537 538 struct list_head requeue_list; 539 spinlock_t requeue_lock; 540 struct delayed_work requeue_work; 541 542 struct mutex sysfs_lock; 543 struct mutex sysfs_dir_lock; 544 545 /* 546 * for reusing dead hctx instance in case of updating 547 * nr_hw_queues 548 */ 549 struct list_head unused_hctx_list; 550 spinlock_t unused_hctx_lock; 551 552 int mq_freeze_depth; 553 554 #if defined(CONFIG_BLK_DEV_BSG) 555 struct bsg_class_device bsg_dev; 556 #endif 557 558 #ifdef CONFIG_BLK_DEV_THROTTLING 559 /* Throttle data */ 560 struct throtl_data *td; 561 #endif 562 struct rcu_head rcu_head; 563 wait_queue_head_t mq_freeze_wq; 564 /* 565 * Protect concurrent access to q_usage_counter by 566 * percpu_ref_kill() and percpu_ref_reinit(). 567 */ 568 struct mutex mq_freeze_lock; 569 struct percpu_ref q_usage_counter; 570 571 struct blk_mq_tag_set *tag_set; 572 struct list_head tag_set_list; 573 struct bio_set bio_split; 574 575 struct dentry *debugfs_dir; 576 577 #ifdef CONFIG_BLK_DEBUG_FS 578 struct dentry *sched_debugfs_dir; 579 struct dentry *rqos_debugfs_dir; 580 #endif 581 582 bool mq_sysfs_init_done; 583 584 size_t cmd_size; 585 586 #define BLK_MAX_WRITE_HINTS 5 587 u64 write_hints[BLK_MAX_WRITE_HINTS]; 588 }; 589 590 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 591 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 592 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 593 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 594 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 595 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 596 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 597 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 598 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 599 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ 600 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 601 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 602 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ 603 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 604 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 605 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 606 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 607 #define QUEUE_FLAG_WC 17 /* Write back caching */ 608 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 609 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 610 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 611 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ 612 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 613 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ 614 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 615 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 616 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 617 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 618 619 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 620 (1 << QUEUE_FLAG_SAME_COMP)) 621 622 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 623 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 624 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 625 626 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 627 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 628 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 629 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 630 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 631 #define blk_queue_noxmerges(q) \ 632 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 633 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 634 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 635 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 636 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 637 #define blk_queue_zone_resetall(q) \ 638 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 639 #define blk_queue_secure_erase(q) \ 640 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 641 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 642 #define blk_queue_scsi_passthrough(q) \ 643 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 644 #define blk_queue_pci_p2pdma(q) \ 645 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 646 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 647 #define blk_queue_rq_alloc_time(q) \ 648 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 649 #else 650 #define blk_queue_rq_alloc_time(q) false 651 #endif 652 653 #define blk_noretry_request(rq) \ 654 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 655 REQ_FAILFAST_DRIVER)) 656 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 657 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 658 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 659 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 660 661 extern void blk_set_pm_only(struct request_queue *q); 662 extern void blk_clear_pm_only(struct request_queue *q); 663 664 static inline bool blk_account_rq(struct request *rq) 665 { 666 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 667 } 668 669 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 670 671 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 672 673 #define rq_dma_dir(rq) \ 674 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 675 676 #define dma_map_bvec(dev, bv, dir, attrs) \ 677 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 678 (dir), (attrs)) 679 680 static inline bool queue_is_mq(struct request_queue *q) 681 { 682 return q->mq_ops; 683 } 684 685 static inline enum blk_zoned_model 686 blk_queue_zoned_model(struct request_queue *q) 687 { 688 return q->limits.zoned; 689 } 690 691 static inline bool blk_queue_is_zoned(struct request_queue *q) 692 { 693 switch (blk_queue_zoned_model(q)) { 694 case BLK_ZONED_HA: 695 case BLK_ZONED_HM: 696 return true; 697 default: 698 return false; 699 } 700 } 701 702 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 703 { 704 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 705 } 706 707 #ifdef CONFIG_BLK_DEV_ZONED 708 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 709 { 710 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 711 } 712 713 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 714 sector_t sector) 715 { 716 if (!blk_queue_is_zoned(q)) 717 return 0; 718 return sector >> ilog2(q->limits.chunk_sectors); 719 } 720 721 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 722 sector_t sector) 723 { 724 if (!blk_queue_is_zoned(q)) 725 return false; 726 if (!q->conv_zones_bitmap) 727 return true; 728 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 729 } 730 731 static inline void blk_queue_max_open_zones(struct request_queue *q, 732 unsigned int max_open_zones) 733 { 734 q->max_open_zones = max_open_zones; 735 } 736 737 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 738 { 739 return q->max_open_zones; 740 } 741 742 static inline void blk_queue_max_active_zones(struct request_queue *q, 743 unsigned int max_active_zones) 744 { 745 q->max_active_zones = max_active_zones; 746 } 747 748 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 749 { 750 return q->max_active_zones; 751 } 752 #else /* CONFIG_BLK_DEV_ZONED */ 753 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 754 { 755 return 0; 756 } 757 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 758 sector_t sector) 759 { 760 return false; 761 } 762 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 763 sector_t sector) 764 { 765 return 0; 766 } 767 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 768 { 769 return 0; 770 } 771 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 772 { 773 return 0; 774 } 775 #endif /* CONFIG_BLK_DEV_ZONED */ 776 777 static inline bool rq_is_sync(struct request *rq) 778 { 779 return op_is_sync(rq->cmd_flags); 780 } 781 782 static inline bool rq_mergeable(struct request *rq) 783 { 784 if (blk_rq_is_passthrough(rq)) 785 return false; 786 787 if (req_op(rq) == REQ_OP_FLUSH) 788 return false; 789 790 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 791 return false; 792 793 if (req_op(rq) == REQ_OP_ZONE_APPEND) 794 return false; 795 796 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 797 return false; 798 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 799 return false; 800 801 return true; 802 } 803 804 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 805 { 806 if (bio_page(a) == bio_page(b) && 807 bio_offset(a) == bio_offset(b)) 808 return true; 809 810 return false; 811 } 812 813 static inline unsigned int blk_queue_depth(struct request_queue *q) 814 { 815 if (q->queue_depth) 816 return q->queue_depth; 817 818 return q->nr_requests; 819 } 820 821 extern unsigned long blk_max_low_pfn, blk_max_pfn; 822 823 /* 824 * standard bounce addresses: 825 * 826 * BLK_BOUNCE_HIGH : bounce all highmem pages 827 * BLK_BOUNCE_ANY : don't bounce anything 828 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 829 */ 830 831 #if BITS_PER_LONG == 32 832 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 833 #else 834 #define BLK_BOUNCE_HIGH -1ULL 835 #endif 836 #define BLK_BOUNCE_ANY (-1ULL) 837 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 838 839 /* 840 * default timeout for SG_IO if none specified 841 */ 842 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 843 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 844 845 struct rq_map_data { 846 struct page **pages; 847 int page_order; 848 int nr_entries; 849 unsigned long offset; 850 int null_mapped; 851 int from_user; 852 }; 853 854 struct req_iterator { 855 struct bvec_iter iter; 856 struct bio *bio; 857 }; 858 859 /* This should not be used directly - use rq_for_each_segment */ 860 #define for_each_bio(_bio) \ 861 for (; _bio; _bio = _bio->bi_next) 862 #define __rq_for_each_bio(_bio, rq) \ 863 if ((rq->bio)) \ 864 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 865 866 #define rq_for_each_segment(bvl, _rq, _iter) \ 867 __rq_for_each_bio(_iter.bio, _rq) \ 868 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 869 870 #define rq_for_each_bvec(bvl, _rq, _iter) \ 871 __rq_for_each_bio(_iter.bio, _rq) \ 872 bio_for_each_bvec(bvl, _iter.bio, _iter.iter) 873 874 #define rq_iter_last(bvec, _iter) \ 875 (_iter.bio->bi_next == NULL && \ 876 bio_iter_last(bvec, _iter.iter)) 877 878 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 879 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 880 #endif 881 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 882 extern void rq_flush_dcache_pages(struct request *rq); 883 #else 884 static inline void rq_flush_dcache_pages(struct request *rq) 885 { 886 } 887 #endif 888 889 extern int blk_register_queue(struct gendisk *disk); 890 extern void blk_unregister_queue(struct gendisk *disk); 891 blk_qc_t submit_bio_noacct(struct bio *bio); 892 extern void blk_rq_init(struct request_queue *q, struct request *rq); 893 extern void blk_put_request(struct request *); 894 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 895 blk_mq_req_flags_t flags); 896 extern int blk_lld_busy(struct request_queue *q); 897 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 898 struct bio_set *bs, gfp_t gfp_mask, 899 int (*bio_ctr)(struct bio *, struct bio *, void *), 900 void *data); 901 extern void blk_rq_unprep_clone(struct request *rq); 902 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 903 struct request *rq); 904 extern int blk_rq_append_bio(struct request *rq, struct bio **bio); 905 extern void blk_queue_split(struct bio **); 906 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 907 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 908 unsigned int, void __user *); 909 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 910 unsigned int, void __user *); 911 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 912 struct scsi_ioctl_command __user *); 913 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); 914 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); 915 916 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 917 extern void blk_queue_exit(struct request_queue *q); 918 extern void blk_sync_queue(struct request_queue *q); 919 extern int blk_rq_map_user(struct request_queue *, struct request *, 920 struct rq_map_data *, void __user *, unsigned long, 921 gfp_t); 922 extern int blk_rq_unmap_user(struct bio *); 923 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 924 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 925 struct rq_map_data *, const struct iov_iter *, 926 gfp_t); 927 extern void blk_execute_rq(struct request_queue *, struct gendisk *, 928 struct request *, int); 929 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 930 struct request *, int, rq_end_io_fn *); 931 932 /* Helper to convert REQ_OP_XXX to its string format XXX */ 933 extern const char *blk_op_str(unsigned int op); 934 935 int blk_status_to_errno(blk_status_t status); 936 blk_status_t errno_to_blk_status(int errno); 937 938 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); 939 940 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 941 { 942 return bdev->bd_disk->queue; /* this is never NULL */ 943 } 944 945 /* 946 * The basic unit of block I/O is a sector. It is used in a number of contexts 947 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 948 * bytes. Variables of type sector_t represent an offset or size that is a 949 * multiple of 512 bytes. Hence these two constants. 950 */ 951 #ifndef SECTOR_SHIFT 952 #define SECTOR_SHIFT 9 953 #endif 954 #ifndef SECTOR_SIZE 955 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 956 #endif 957 958 /* 959 * blk_rq_pos() : the current sector 960 * blk_rq_bytes() : bytes left in the entire request 961 * blk_rq_cur_bytes() : bytes left in the current segment 962 * blk_rq_err_bytes() : bytes left till the next error boundary 963 * blk_rq_sectors() : sectors left in the entire request 964 * blk_rq_cur_sectors() : sectors left in the current segment 965 * blk_rq_stats_sectors() : sectors of the entire request used for stats 966 */ 967 static inline sector_t blk_rq_pos(const struct request *rq) 968 { 969 return rq->__sector; 970 } 971 972 static inline unsigned int blk_rq_bytes(const struct request *rq) 973 { 974 return rq->__data_len; 975 } 976 977 static inline int blk_rq_cur_bytes(const struct request *rq) 978 { 979 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 980 } 981 982 extern unsigned int blk_rq_err_bytes(const struct request *rq); 983 984 static inline unsigned int blk_rq_sectors(const struct request *rq) 985 { 986 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 987 } 988 989 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 990 { 991 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 992 } 993 994 static inline unsigned int blk_rq_stats_sectors(const struct request *rq) 995 { 996 return rq->stats_sectors; 997 } 998 999 #ifdef CONFIG_BLK_DEV_ZONED 1000 1001 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 1002 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 1003 1004 static inline unsigned int blk_rq_zone_no(struct request *rq) 1005 { 1006 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1007 } 1008 1009 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1010 { 1011 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1012 } 1013 #endif /* CONFIG_BLK_DEV_ZONED */ 1014 1015 /* 1016 * Some commands like WRITE SAME have a payload or data transfer size which 1017 * is different from the size of the request. Any driver that supports such 1018 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1019 * calculate the data transfer size. 1020 */ 1021 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1022 { 1023 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1024 return rq->special_vec.bv_len; 1025 return blk_rq_bytes(rq); 1026 } 1027 1028 /* 1029 * Return the first full biovec in the request. The caller needs to check that 1030 * there are any bvecs before calling this helper. 1031 */ 1032 static inline struct bio_vec req_bvec(struct request *rq) 1033 { 1034 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1035 return rq->special_vec; 1036 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); 1037 } 1038 1039 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1040 int op) 1041 { 1042 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1043 return min(q->limits.max_discard_sectors, 1044 UINT_MAX >> SECTOR_SHIFT); 1045 1046 if (unlikely(op == REQ_OP_WRITE_SAME)) 1047 return q->limits.max_write_same_sectors; 1048 1049 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1050 return q->limits.max_write_zeroes_sectors; 1051 1052 return q->limits.max_sectors; 1053 } 1054 1055 /* 1056 * Return maximum size of a request at given offset. Only valid for 1057 * file system requests. 1058 */ 1059 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1060 sector_t offset) 1061 { 1062 if (!q->limits.chunk_sectors) 1063 return q->limits.max_sectors; 1064 1065 return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors - 1066 (offset & (q->limits.chunk_sectors - 1)))); 1067 } 1068 1069 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1070 sector_t offset) 1071 { 1072 struct request_queue *q = rq->q; 1073 1074 if (blk_rq_is_passthrough(rq)) 1075 return q->limits.max_hw_sectors; 1076 1077 if (!q->limits.chunk_sectors || 1078 req_op(rq) == REQ_OP_DISCARD || 1079 req_op(rq) == REQ_OP_SECURE_ERASE) 1080 return blk_queue_get_max_sectors(q, req_op(rq)); 1081 1082 return min(blk_max_size_offset(q, offset), 1083 blk_queue_get_max_sectors(q, req_op(rq))); 1084 } 1085 1086 static inline unsigned int blk_rq_count_bios(struct request *rq) 1087 { 1088 unsigned int nr_bios = 0; 1089 struct bio *bio; 1090 1091 __rq_for_each_bio(bio, rq) 1092 nr_bios++; 1093 1094 return nr_bios; 1095 } 1096 1097 void blk_steal_bios(struct bio_list *list, struct request *rq); 1098 1099 /* 1100 * Request completion related functions. 1101 * 1102 * blk_update_request() completes given number of bytes and updates 1103 * the request without completing it. 1104 */ 1105 extern bool blk_update_request(struct request *rq, blk_status_t error, 1106 unsigned int nr_bytes); 1107 1108 extern void blk_abort_request(struct request *); 1109 1110 /* 1111 * Access functions for manipulating queue properties 1112 */ 1113 extern void blk_cleanup_queue(struct request_queue *); 1114 extern void blk_queue_bounce_limit(struct request_queue *, u64); 1115 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1116 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1117 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1118 extern void blk_queue_max_discard_segments(struct request_queue *, 1119 unsigned short); 1120 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1121 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1122 unsigned int max_discard_sectors); 1123 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1124 unsigned int max_write_same_sectors); 1125 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1126 unsigned int max_write_same_sectors); 1127 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 1128 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 1129 unsigned int max_zone_append_sectors); 1130 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1131 extern void blk_queue_alignment_offset(struct request_queue *q, 1132 unsigned int alignment); 1133 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1134 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1135 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1136 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1137 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1138 extern void blk_set_default_limits(struct queue_limits *lim); 1139 extern void blk_set_stacking_limits(struct queue_limits *lim); 1140 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1141 sector_t offset); 1142 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1143 sector_t offset); 1144 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1145 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1146 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1147 extern void blk_queue_dma_alignment(struct request_queue *, int); 1148 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1149 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1150 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1151 extern void blk_queue_required_elevator_features(struct request_queue *q, 1152 unsigned int features); 1153 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1154 struct device *dev); 1155 1156 /* 1157 * Number of physical segments as sent to the device. 1158 * 1159 * Normally this is the number of discontiguous data segments sent by the 1160 * submitter. But for data-less command like discard we might have no 1161 * actual data segments submitted, but the driver might have to add it's 1162 * own special payload. In that case we still return 1 here so that this 1163 * special payload will be mapped. 1164 */ 1165 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1166 { 1167 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1168 return 1; 1169 return rq->nr_phys_segments; 1170 } 1171 1172 /* 1173 * Number of discard segments (or ranges) the driver needs to fill in. 1174 * Each discard bio merged into a request is counted as one segment. 1175 */ 1176 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1177 { 1178 return max_t(unsigned short, rq->nr_phys_segments, 1); 1179 } 1180 1181 int __blk_rq_map_sg(struct request_queue *q, struct request *rq, 1182 struct scatterlist *sglist, struct scatterlist **last_sg); 1183 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, 1184 struct scatterlist *sglist) 1185 { 1186 struct scatterlist *last_sg = NULL; 1187 1188 return __blk_rq_map_sg(q, rq, sglist, &last_sg); 1189 } 1190 extern void blk_dump_rq_flags(struct request *, char *); 1191 1192 bool __must_check blk_get_queue(struct request_queue *); 1193 struct request_queue *blk_alloc_queue(int node_id); 1194 extern void blk_put_queue(struct request_queue *); 1195 extern void blk_set_queue_dying(struct request_queue *); 1196 1197 #ifdef CONFIG_BLOCK 1198 /* 1199 * blk_plug permits building a queue of related requests by holding the I/O 1200 * fragments for a short period. This allows merging of sequential requests 1201 * into single larger request. As the requests are moved from a per-task list to 1202 * the device's request_queue in a batch, this results in improved scalability 1203 * as the lock contention for request_queue lock is reduced. 1204 * 1205 * It is ok not to disable preemption when adding the request to the plug list 1206 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1207 * the plug list when the task sleeps by itself. For details, please see 1208 * schedule() where blk_schedule_flush_plug() is called. 1209 */ 1210 struct blk_plug { 1211 struct list_head mq_list; /* blk-mq requests */ 1212 struct list_head cb_list; /* md requires an unplug callback */ 1213 unsigned short rq_count; 1214 bool multiple_queues; 1215 bool nowait; 1216 }; 1217 #define BLK_MAX_REQUEST_COUNT 16 1218 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1219 1220 struct blk_plug_cb; 1221 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1222 struct blk_plug_cb { 1223 struct list_head list; 1224 blk_plug_cb_fn callback; 1225 void *data; 1226 }; 1227 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1228 void *data, int size); 1229 extern void blk_start_plug(struct blk_plug *); 1230 extern void blk_finish_plug(struct blk_plug *); 1231 extern void blk_flush_plug_list(struct blk_plug *, bool); 1232 1233 static inline void blk_flush_plug(struct task_struct *tsk) 1234 { 1235 struct blk_plug *plug = tsk->plug; 1236 1237 if (plug) 1238 blk_flush_plug_list(plug, false); 1239 } 1240 1241 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1242 { 1243 struct blk_plug *plug = tsk->plug; 1244 1245 if (plug) 1246 blk_flush_plug_list(plug, true); 1247 } 1248 1249 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1250 { 1251 struct blk_plug *plug = tsk->plug; 1252 1253 return plug && 1254 (!list_empty(&plug->mq_list) || 1255 !list_empty(&plug->cb_list)); 1256 } 1257 1258 int blkdev_issue_flush(struct block_device *, gfp_t); 1259 long nr_blockdev_pages(void); 1260 #else /* CONFIG_BLOCK */ 1261 struct blk_plug { 1262 }; 1263 1264 static inline void blk_start_plug(struct blk_plug *plug) 1265 { 1266 } 1267 1268 static inline void blk_finish_plug(struct blk_plug *plug) 1269 { 1270 } 1271 1272 static inline void blk_flush_plug(struct task_struct *task) 1273 { 1274 } 1275 1276 static inline void blk_schedule_flush_plug(struct task_struct *task) 1277 { 1278 } 1279 1280 1281 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1282 { 1283 return false; 1284 } 1285 1286 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask) 1287 { 1288 return 0; 1289 } 1290 1291 static inline long nr_blockdev_pages(void) 1292 { 1293 return 0; 1294 } 1295 #endif /* CONFIG_BLOCK */ 1296 1297 extern void blk_io_schedule(void); 1298 1299 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1300 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1301 1302 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1303 1304 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1305 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1306 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1307 sector_t nr_sects, gfp_t gfp_mask, int flags, 1308 struct bio **biop); 1309 1310 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1311 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1312 1313 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1314 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1315 unsigned flags); 1316 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1317 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1318 1319 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1320 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1321 { 1322 return blkdev_issue_discard(sb->s_bdev, 1323 block << (sb->s_blocksize_bits - 1324 SECTOR_SHIFT), 1325 nr_blocks << (sb->s_blocksize_bits - 1326 SECTOR_SHIFT), 1327 gfp_mask, flags); 1328 } 1329 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1330 sector_t nr_blocks, gfp_t gfp_mask) 1331 { 1332 return blkdev_issue_zeroout(sb->s_bdev, 1333 block << (sb->s_blocksize_bits - 1334 SECTOR_SHIFT), 1335 nr_blocks << (sb->s_blocksize_bits - 1336 SECTOR_SHIFT), 1337 gfp_mask, 0); 1338 } 1339 1340 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1341 1342 enum blk_default_limits { 1343 BLK_MAX_SEGMENTS = 128, 1344 BLK_SAFE_MAX_SECTORS = 255, 1345 BLK_DEF_MAX_SECTORS = 2560, 1346 BLK_MAX_SEGMENT_SIZE = 65536, 1347 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1348 }; 1349 1350 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1351 { 1352 return q->limits.seg_boundary_mask; 1353 } 1354 1355 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1356 { 1357 return q->limits.virt_boundary_mask; 1358 } 1359 1360 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1361 { 1362 return q->limits.max_sectors; 1363 } 1364 1365 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1366 { 1367 return q->limits.max_hw_sectors; 1368 } 1369 1370 static inline unsigned short queue_max_segments(const struct request_queue *q) 1371 { 1372 return q->limits.max_segments; 1373 } 1374 1375 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1376 { 1377 return q->limits.max_discard_segments; 1378 } 1379 1380 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1381 { 1382 return q->limits.max_segment_size; 1383 } 1384 1385 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1386 { 1387 return q->limits.max_zone_append_sectors; 1388 } 1389 1390 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1391 { 1392 int retval = 512; 1393 1394 if (q && q->limits.logical_block_size) 1395 retval = q->limits.logical_block_size; 1396 1397 return retval; 1398 } 1399 1400 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1401 { 1402 return queue_logical_block_size(bdev_get_queue(bdev)); 1403 } 1404 1405 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1406 { 1407 return q->limits.physical_block_size; 1408 } 1409 1410 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1411 { 1412 return queue_physical_block_size(bdev_get_queue(bdev)); 1413 } 1414 1415 static inline unsigned int queue_io_min(const struct request_queue *q) 1416 { 1417 return q->limits.io_min; 1418 } 1419 1420 static inline int bdev_io_min(struct block_device *bdev) 1421 { 1422 return queue_io_min(bdev_get_queue(bdev)); 1423 } 1424 1425 static inline unsigned int queue_io_opt(const struct request_queue *q) 1426 { 1427 return q->limits.io_opt; 1428 } 1429 1430 static inline int bdev_io_opt(struct block_device *bdev) 1431 { 1432 return queue_io_opt(bdev_get_queue(bdev)); 1433 } 1434 1435 static inline int queue_alignment_offset(const struct request_queue *q) 1436 { 1437 if (q->limits.misaligned) 1438 return -1; 1439 1440 return q->limits.alignment_offset; 1441 } 1442 1443 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1444 { 1445 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1446 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1447 << SECTOR_SHIFT; 1448 1449 return (granularity + lim->alignment_offset - alignment) % granularity; 1450 } 1451 1452 static inline int bdev_alignment_offset(struct block_device *bdev) 1453 { 1454 struct request_queue *q = bdev_get_queue(bdev); 1455 1456 if (q->limits.misaligned) 1457 return -1; 1458 1459 if (bdev != bdev->bd_contains) 1460 return bdev->bd_part->alignment_offset; 1461 1462 return q->limits.alignment_offset; 1463 } 1464 1465 static inline int queue_discard_alignment(const struct request_queue *q) 1466 { 1467 if (q->limits.discard_misaligned) 1468 return -1; 1469 1470 return q->limits.discard_alignment; 1471 } 1472 1473 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1474 { 1475 unsigned int alignment, granularity, offset; 1476 1477 if (!lim->max_discard_sectors) 1478 return 0; 1479 1480 /* Why are these in bytes, not sectors? */ 1481 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1482 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1483 if (!granularity) 1484 return 0; 1485 1486 /* Offset of the partition start in 'granularity' sectors */ 1487 offset = sector_div(sector, granularity); 1488 1489 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1490 offset = (granularity + alignment - offset) % granularity; 1491 1492 /* Turn it back into bytes, gaah */ 1493 return offset << SECTOR_SHIFT; 1494 } 1495 1496 static inline int bdev_discard_alignment(struct block_device *bdev) 1497 { 1498 struct request_queue *q = bdev_get_queue(bdev); 1499 1500 if (bdev != bdev->bd_contains) 1501 return bdev->bd_part->discard_alignment; 1502 1503 return q->limits.discard_alignment; 1504 } 1505 1506 static inline unsigned int bdev_write_same(struct block_device *bdev) 1507 { 1508 struct request_queue *q = bdev_get_queue(bdev); 1509 1510 if (q) 1511 return q->limits.max_write_same_sectors; 1512 1513 return 0; 1514 } 1515 1516 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1517 { 1518 struct request_queue *q = bdev_get_queue(bdev); 1519 1520 if (q) 1521 return q->limits.max_write_zeroes_sectors; 1522 1523 return 0; 1524 } 1525 1526 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1527 { 1528 struct request_queue *q = bdev_get_queue(bdev); 1529 1530 if (q) 1531 return blk_queue_zoned_model(q); 1532 1533 return BLK_ZONED_NONE; 1534 } 1535 1536 static inline bool bdev_is_zoned(struct block_device *bdev) 1537 { 1538 struct request_queue *q = bdev_get_queue(bdev); 1539 1540 if (q) 1541 return blk_queue_is_zoned(q); 1542 1543 return false; 1544 } 1545 1546 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1547 { 1548 struct request_queue *q = bdev_get_queue(bdev); 1549 1550 if (q) 1551 return blk_queue_zone_sectors(q); 1552 return 0; 1553 } 1554 1555 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1556 { 1557 struct request_queue *q = bdev_get_queue(bdev); 1558 1559 if (q) 1560 return queue_max_open_zones(q); 1561 return 0; 1562 } 1563 1564 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1565 { 1566 struct request_queue *q = bdev_get_queue(bdev); 1567 1568 if (q) 1569 return queue_max_active_zones(q); 1570 return 0; 1571 } 1572 1573 static inline int queue_dma_alignment(const struct request_queue *q) 1574 { 1575 return q ? q->dma_alignment : 511; 1576 } 1577 1578 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1579 unsigned int len) 1580 { 1581 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1582 return !(addr & alignment) && !(len & alignment); 1583 } 1584 1585 /* assumes size > 256 */ 1586 static inline unsigned int blksize_bits(unsigned int size) 1587 { 1588 unsigned int bits = 8; 1589 do { 1590 bits++; 1591 size >>= 1; 1592 } while (size > 256); 1593 return bits; 1594 } 1595 1596 static inline unsigned int block_size(struct block_device *bdev) 1597 { 1598 return 1 << bdev->bd_inode->i_blkbits; 1599 } 1600 1601 int kblockd_schedule_work(struct work_struct *work); 1602 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1603 1604 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1605 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1606 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1607 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1608 1609 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1610 1611 enum blk_integrity_flags { 1612 BLK_INTEGRITY_VERIFY = 1 << 0, 1613 BLK_INTEGRITY_GENERATE = 1 << 1, 1614 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1615 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1616 }; 1617 1618 struct blk_integrity_iter { 1619 void *prot_buf; 1620 void *data_buf; 1621 sector_t seed; 1622 unsigned int data_size; 1623 unsigned short interval; 1624 const char *disk_name; 1625 }; 1626 1627 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1628 typedef void (integrity_prepare_fn) (struct request *); 1629 typedef void (integrity_complete_fn) (struct request *, unsigned int); 1630 1631 struct blk_integrity_profile { 1632 integrity_processing_fn *generate_fn; 1633 integrity_processing_fn *verify_fn; 1634 integrity_prepare_fn *prepare_fn; 1635 integrity_complete_fn *complete_fn; 1636 const char *name; 1637 }; 1638 1639 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1640 extern void blk_integrity_unregister(struct gendisk *); 1641 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1642 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1643 struct scatterlist *); 1644 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1645 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, 1646 struct request *); 1647 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, 1648 struct bio *); 1649 1650 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1651 { 1652 struct blk_integrity *bi = &disk->queue->integrity; 1653 1654 if (!bi->profile) 1655 return NULL; 1656 1657 return bi; 1658 } 1659 1660 static inline 1661 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1662 { 1663 return blk_get_integrity(bdev->bd_disk); 1664 } 1665 1666 static inline bool 1667 blk_integrity_queue_supports_integrity(struct request_queue *q) 1668 { 1669 return q->integrity.profile; 1670 } 1671 1672 static inline bool blk_integrity_rq(struct request *rq) 1673 { 1674 return rq->cmd_flags & REQ_INTEGRITY; 1675 } 1676 1677 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1678 unsigned int segs) 1679 { 1680 q->limits.max_integrity_segments = segs; 1681 } 1682 1683 static inline unsigned short 1684 queue_max_integrity_segments(const struct request_queue *q) 1685 { 1686 return q->limits.max_integrity_segments; 1687 } 1688 1689 /** 1690 * bio_integrity_intervals - Return number of integrity intervals for a bio 1691 * @bi: blk_integrity profile for device 1692 * @sectors: Size of the bio in 512-byte sectors 1693 * 1694 * Description: The block layer calculates everything in 512 byte 1695 * sectors but integrity metadata is done in terms of the data integrity 1696 * interval size of the storage device. Convert the block layer sectors 1697 * to the appropriate number of integrity intervals. 1698 */ 1699 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1700 unsigned int sectors) 1701 { 1702 return sectors >> (bi->interval_exp - 9); 1703 } 1704 1705 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1706 unsigned int sectors) 1707 { 1708 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1709 } 1710 1711 /* 1712 * Return the first bvec that contains integrity data. Only drivers that are 1713 * limited to a single integrity segment should use this helper. 1714 */ 1715 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1716 { 1717 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) 1718 return NULL; 1719 return rq->bio->bi_integrity->bip_vec; 1720 } 1721 1722 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1723 1724 struct bio; 1725 struct block_device; 1726 struct gendisk; 1727 struct blk_integrity; 1728 1729 static inline int blk_integrity_rq(struct request *rq) 1730 { 1731 return 0; 1732 } 1733 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1734 struct bio *b) 1735 { 1736 return 0; 1737 } 1738 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1739 struct bio *b, 1740 struct scatterlist *s) 1741 { 1742 return 0; 1743 } 1744 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1745 { 1746 return NULL; 1747 } 1748 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1749 { 1750 return NULL; 1751 } 1752 static inline bool 1753 blk_integrity_queue_supports_integrity(struct request_queue *q) 1754 { 1755 return false; 1756 } 1757 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1758 { 1759 return 0; 1760 } 1761 static inline void blk_integrity_register(struct gendisk *d, 1762 struct blk_integrity *b) 1763 { 1764 } 1765 static inline void blk_integrity_unregister(struct gendisk *d) 1766 { 1767 } 1768 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1769 unsigned int segs) 1770 { 1771 } 1772 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) 1773 { 1774 return 0; 1775 } 1776 static inline bool blk_integrity_merge_rq(struct request_queue *rq, 1777 struct request *r1, 1778 struct request *r2) 1779 { 1780 return true; 1781 } 1782 static inline bool blk_integrity_merge_bio(struct request_queue *rq, 1783 struct request *r, 1784 struct bio *b) 1785 { 1786 return true; 1787 } 1788 1789 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1790 unsigned int sectors) 1791 { 1792 return 0; 1793 } 1794 1795 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1796 unsigned int sectors) 1797 { 1798 return 0; 1799 } 1800 1801 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1802 { 1803 return NULL; 1804 } 1805 1806 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1807 1808 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1809 1810 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); 1811 1812 void blk_ksm_unregister(struct request_queue *q); 1813 1814 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1815 1816 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, 1817 struct request_queue *q) 1818 { 1819 return true; 1820 } 1821 1822 static inline void blk_ksm_unregister(struct request_queue *q) { } 1823 1824 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1825 1826 1827 struct block_device_operations { 1828 blk_qc_t (*submit_bio) (struct bio *bio); 1829 int (*open) (struct block_device *, fmode_t); 1830 void (*release) (struct gendisk *, fmode_t); 1831 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1832 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1833 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1834 unsigned int (*check_events) (struct gendisk *disk, 1835 unsigned int clearing); 1836 void (*unlock_native_capacity) (struct gendisk *); 1837 int (*revalidate_disk) (struct gendisk *); 1838 int (*getgeo)(struct block_device *, struct hd_geometry *); 1839 /* this callback is with swap_lock and sometimes page table lock held */ 1840 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1841 int (*report_zones)(struct gendisk *, sector_t sector, 1842 unsigned int nr_zones, report_zones_cb cb, void *data); 1843 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1844 struct module *owner; 1845 const struct pr_ops *pr_ops; 1846 }; 1847 1848 #ifdef CONFIG_COMPAT 1849 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1850 unsigned int, unsigned long); 1851 #else 1852 #define blkdev_compat_ptr_ioctl NULL 1853 #endif 1854 1855 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1856 unsigned long); 1857 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1858 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1859 struct writeback_control *); 1860 1861 #ifdef CONFIG_BLK_DEV_ZONED 1862 bool blk_req_needs_zone_write_lock(struct request *rq); 1863 bool blk_req_zone_write_trylock(struct request *rq); 1864 void __blk_req_zone_write_lock(struct request *rq); 1865 void __blk_req_zone_write_unlock(struct request *rq); 1866 1867 static inline void blk_req_zone_write_lock(struct request *rq) 1868 { 1869 if (blk_req_needs_zone_write_lock(rq)) 1870 __blk_req_zone_write_lock(rq); 1871 } 1872 1873 static inline void blk_req_zone_write_unlock(struct request *rq) 1874 { 1875 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1876 __blk_req_zone_write_unlock(rq); 1877 } 1878 1879 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1880 { 1881 return rq->q->seq_zones_wlock && 1882 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1883 } 1884 1885 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1886 { 1887 if (!blk_req_needs_zone_write_lock(rq)) 1888 return true; 1889 return !blk_req_zone_is_write_locked(rq); 1890 } 1891 #else 1892 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1893 { 1894 return false; 1895 } 1896 1897 static inline void blk_req_zone_write_lock(struct request *rq) 1898 { 1899 } 1900 1901 static inline void blk_req_zone_write_unlock(struct request *rq) 1902 { 1903 } 1904 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1905 { 1906 return false; 1907 } 1908 1909 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1910 { 1911 return true; 1912 } 1913 #endif /* CONFIG_BLK_DEV_ZONED */ 1914 1915 static inline void blk_wake_io_task(struct task_struct *waiter) 1916 { 1917 /* 1918 * If we're polling, the task itself is doing the completions. For 1919 * that case, we don't need to signal a wakeup, it's enough to just 1920 * mark us as RUNNING. 1921 */ 1922 if (waiter == current) 1923 __set_current_state(TASK_RUNNING); 1924 else 1925 wake_up_process(waiter); 1926 } 1927 1928 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1929 unsigned int op); 1930 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1931 unsigned long start_time); 1932 1933 /** 1934 * bio_start_io_acct - start I/O accounting for bio based drivers 1935 * @bio: bio to start account for 1936 * 1937 * Returns the start time that should be passed back to bio_end_io_acct(). 1938 */ 1939 static inline unsigned long bio_start_io_acct(struct bio *bio) 1940 { 1941 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); 1942 } 1943 1944 /** 1945 * bio_end_io_acct - end I/O accounting for bio based drivers 1946 * @bio: bio to end account for 1947 * @start: start time returned by bio_start_io_acct() 1948 */ 1949 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1950 { 1951 return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time); 1952 } 1953 1954 int bdev_read_only(struct block_device *bdev); 1955 int set_blocksize(struct block_device *bdev, int size); 1956 1957 const char *bdevname(struct block_device *bdev, char *buffer); 1958 struct block_device *lookup_bdev(const char *); 1959 1960 void blkdev_show(struct seq_file *seqf, off_t offset); 1961 1962 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1963 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1964 #ifdef CONFIG_BLOCK 1965 #define BLKDEV_MAJOR_MAX 512 1966 #else 1967 #define BLKDEV_MAJOR_MAX 0 1968 #endif 1969 1970 int blkdev_get(struct block_device *bdev, fmode_t mode, void *holder); 1971 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 1972 void *holder); 1973 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 1974 int bd_prepare_to_claim(struct block_device *bdev, struct block_device *whole, 1975 void *holder); 1976 void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, 1977 void *holder); 1978 void blkdev_put(struct block_device *bdev, fmode_t mode); 1979 1980 struct block_device *I_BDEV(struct inode *inode); 1981 struct block_device *bdget(dev_t); 1982 struct block_device *bdgrab(struct block_device *bdev); 1983 void bdput(struct block_device *); 1984 1985 #ifdef CONFIG_BLOCK 1986 void invalidate_bdev(struct block_device *bdev); 1987 int sync_blockdev(struct block_device *bdev); 1988 #else 1989 static inline void invalidate_bdev(struct block_device *bdev) 1990 { 1991 } 1992 static inline int sync_blockdev(struct block_device *bdev) 1993 { 1994 return 0; 1995 } 1996 #endif 1997 int fsync_bdev(struct block_device *bdev); 1998 1999 struct super_block *freeze_bdev(struct block_device *bdev); 2000 int thaw_bdev(struct block_device *bdev, struct super_block *sb); 2001 2002 #endif /* _LINUX_BLKDEV_H */ 2003