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/minmax.h> 12 #include <linux/timer.h> 13 #include <linux/workqueue.h> 14 #include <linux/pagemap.h> 15 #include <linux/backing-dev-defs.h> 16 #include <linux/wait.h> 17 #include <linux/mempool.h> 18 #include <linux/pfn.h> 19 #include <linux/bio.h> 20 #include <linux/stringify.h> 21 #include <linux/gfp.h> 22 #include <linux/bsg.h> 23 #include <linux/smp.h> 24 #include <linux/rcupdate.h> 25 #include <linux/percpu-refcount.h> 26 #include <linux/scatterlist.h> 27 #include <linux/blkzoned.h> 28 #include <linux/pm.h> 29 30 struct module; 31 struct scsi_ioctl_command; 32 33 struct request_queue; 34 struct elevator_queue; 35 struct blk_trace; 36 struct request; 37 struct sg_io_hdr; 38 struct bsg_job; 39 struct blkcg_gq; 40 struct blk_flush_queue; 41 struct pr_ops; 42 struct rq_qos; 43 struct blk_queue_stats; 44 struct blk_stat_callback; 45 struct blk_keyslot_manager; 46 47 #define BLKDEV_MIN_RQ 4 48 #define BLKDEV_MAX_RQ 128 /* Default maximum */ 49 50 /* Must be consistent with blk_mq_poll_stats_bkt() */ 51 #define BLK_MQ_POLL_STATS_BKTS 16 52 53 /* Doing classic polling */ 54 #define BLK_MQ_POLL_CLASSIC -1 55 56 /* 57 * Maximum number of blkcg policies allowed to be registered concurrently. 58 * Defined here to simplify include dependency. 59 */ 60 #define BLKCG_MAX_POLS 5 61 62 typedef void (rq_end_io_fn)(struct request *, blk_status_t); 63 64 /* 65 * request flags */ 66 typedef __u32 __bitwise req_flags_t; 67 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 /* vaguely specified driver internal error. Ignored by the block layer */ 81 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 82 /* don't warn about errors */ 83 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 84 /* elevator private data attached */ 85 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 86 /* account into disk and partition IO statistics */ 87 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 88 /* request came from our alloc pool */ 89 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) 90 /* runtime pm request */ 91 #define RQF_PM ((__force req_flags_t)(1 << 15)) 92 /* on IO scheduler merge hash */ 93 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 94 /* track IO completion time */ 95 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 96 /* Look at ->special_vec for the actual data payload instead of the 97 bio chain. */ 98 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 99 /* The per-zone write lock is held for this request */ 100 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 101 /* already slept for hybrid poll */ 102 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 103 /* ->timeout has been called, don't expire again */ 104 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 105 106 /* flags that prevent us from merging requests: */ 107 #define RQF_NOMERGE_FLAGS \ 108 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 109 110 /* 111 * Request state for blk-mq. 112 */ 113 enum mq_rq_state { 114 MQ_RQ_IDLE = 0, 115 MQ_RQ_IN_FLIGHT = 1, 116 MQ_RQ_COMPLETE = 2, 117 }; 118 119 /* 120 * Try to put the fields that are referenced together in the same cacheline. 121 * 122 * If you modify this structure, make sure to update blk_rq_init() and 123 * especially blk_mq_rq_ctx_init() to take care of the added fields. 124 */ 125 struct request { 126 struct request_queue *q; 127 struct blk_mq_ctx *mq_ctx; 128 struct blk_mq_hw_ctx *mq_hctx; 129 130 unsigned int cmd_flags; /* op and common flags */ 131 req_flags_t rq_flags; 132 133 int tag; 134 int internal_tag; 135 136 /* the following two fields are internal, NEVER access directly */ 137 unsigned int __data_len; /* total data len */ 138 sector_t __sector; /* sector cursor */ 139 140 struct bio *bio; 141 struct bio *biotail; 142 143 struct list_head queuelist; 144 145 /* 146 * The hash is used inside the scheduler, and killed once the 147 * request reaches the dispatch list. The ipi_list is only used 148 * to queue the request for softirq completion, which is long 149 * after the request has been unhashed (and even removed from 150 * the dispatch list). 151 */ 152 union { 153 struct hlist_node hash; /* merge hash */ 154 struct llist_node ipi_list; 155 }; 156 157 /* 158 * The rb_node is only used inside the io scheduler, requests 159 * are pruned when moved to the dispatch queue. So let the 160 * completion_data share space with the rb_node. 161 */ 162 union { 163 struct rb_node rb_node; /* sort/lookup */ 164 struct bio_vec special_vec; 165 void *completion_data; 166 int error_count; /* for legacy drivers, don't use */ 167 }; 168 169 /* 170 * Three pointers are available for the IO schedulers, if they need 171 * more they have to dynamically allocate it. Flush requests are 172 * never put on the IO scheduler. So let the flush fields share 173 * space with the elevator data. 174 */ 175 union { 176 struct { 177 struct io_cq *icq; 178 void *priv[2]; 179 } elv; 180 181 struct { 182 unsigned int seq; 183 struct list_head list; 184 rq_end_io_fn *saved_end_io; 185 } flush; 186 }; 187 188 struct gendisk *rq_disk; 189 struct block_device *part; 190 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 191 /* Time that the first bio started allocating this request. */ 192 u64 alloc_time_ns; 193 #endif 194 /* Time that this request was allocated for this IO. */ 195 u64 start_time_ns; 196 /* Time that I/O was submitted to the device. */ 197 u64 io_start_time_ns; 198 199 #ifdef CONFIG_BLK_WBT 200 unsigned short wbt_flags; 201 #endif 202 /* 203 * rq sectors used for blk stats. It has the same value 204 * with blk_rq_sectors(rq), except that it never be zeroed 205 * by completion. 206 */ 207 unsigned short stats_sectors; 208 209 /* 210 * Number of scatter-gather DMA addr+len pairs after 211 * physical address coalescing is performed. 212 */ 213 unsigned short nr_phys_segments; 214 215 #if defined(CONFIG_BLK_DEV_INTEGRITY) 216 unsigned short nr_integrity_segments; 217 #endif 218 219 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 220 struct bio_crypt_ctx *crypt_ctx; 221 struct blk_ksm_keyslot *crypt_keyslot; 222 #endif 223 224 unsigned short write_hint; 225 unsigned short ioprio; 226 227 enum mq_rq_state state; 228 refcount_t ref; 229 230 unsigned int timeout; 231 unsigned long deadline; 232 233 union { 234 struct __call_single_data csd; 235 u64 fifo_time; 236 }; 237 238 /* 239 * completion callback. 240 */ 241 rq_end_io_fn *end_io; 242 void *end_io_data; 243 }; 244 245 static inline bool blk_op_is_scsi(unsigned int op) 246 { 247 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 248 } 249 250 static inline bool blk_op_is_private(unsigned int op) 251 { 252 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 253 } 254 255 static inline bool blk_rq_is_scsi(struct request *rq) 256 { 257 return blk_op_is_scsi(req_op(rq)); 258 } 259 260 static inline bool blk_rq_is_private(struct request *rq) 261 { 262 return blk_op_is_private(req_op(rq)); 263 } 264 265 static inline bool blk_rq_is_passthrough(struct request *rq) 266 { 267 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 268 } 269 270 static inline bool bio_is_passthrough(struct bio *bio) 271 { 272 unsigned op = bio_op(bio); 273 274 return blk_op_is_scsi(op) || blk_op_is_private(op); 275 } 276 277 static inline unsigned short req_get_ioprio(struct request *req) 278 { 279 return req->ioprio; 280 } 281 282 #include <linux/elevator.h> 283 284 struct blk_queue_ctx; 285 286 struct bio_vec; 287 288 enum blk_eh_timer_return { 289 BLK_EH_DONE, /* drivers has completed the command */ 290 BLK_EH_RESET_TIMER, /* reset timer and try again */ 291 }; 292 293 enum blk_queue_state { 294 Queue_down, 295 Queue_up, 296 }; 297 298 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ 299 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ 300 301 #define BLK_SCSI_MAX_CMDS (256) 302 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 303 304 /* 305 * Zoned block device models (zoned limit). 306 * 307 * Note: This needs to be ordered from the least to the most severe 308 * restrictions for the inheritance in blk_stack_limits() to work. 309 */ 310 enum blk_zoned_model { 311 BLK_ZONED_NONE = 0, /* Regular block device */ 312 BLK_ZONED_HA, /* Host-aware zoned block device */ 313 BLK_ZONED_HM, /* Host-managed zoned block device */ 314 }; 315 316 struct queue_limits { 317 unsigned long bounce_pfn; 318 unsigned long seg_boundary_mask; 319 unsigned long virt_boundary_mask; 320 321 unsigned int max_hw_sectors; 322 unsigned int max_dev_sectors; 323 unsigned int chunk_sectors; 324 unsigned int max_sectors; 325 unsigned int max_segment_size; 326 unsigned int physical_block_size; 327 unsigned int logical_block_size; 328 unsigned int alignment_offset; 329 unsigned int io_min; 330 unsigned int io_opt; 331 unsigned int max_discard_sectors; 332 unsigned int max_hw_discard_sectors; 333 unsigned int max_write_same_sectors; 334 unsigned int max_write_zeroes_sectors; 335 unsigned int max_zone_append_sectors; 336 unsigned int discard_granularity; 337 unsigned int discard_alignment; 338 unsigned int zone_write_granularity; 339 340 unsigned short max_segments; 341 unsigned short max_integrity_segments; 342 unsigned short max_discard_segments; 343 344 unsigned char misaligned; 345 unsigned char discard_misaligned; 346 unsigned char raid_partial_stripes_expensive; 347 enum blk_zoned_model zoned; 348 }; 349 350 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 351 void *data); 352 353 void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); 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 percpu_ref q_usage_counter; 400 401 struct blk_queue_stats *stats; 402 struct rq_qos *rq_qos; 403 404 const struct blk_mq_ops *mq_ops; 405 406 /* sw queues */ 407 struct blk_mq_ctx __percpu *queue_ctx; 408 409 unsigned int queue_depth; 410 411 /* hw dispatch queues */ 412 struct blk_mq_hw_ctx **queue_hw_ctx; 413 unsigned int nr_hw_queues; 414 415 struct backing_dev_info *backing_dev_info; 416 417 /* 418 * The queue owner gets to use this for whatever they like. 419 * ll_rw_blk doesn't touch it. 420 */ 421 void *queuedata; 422 423 /* 424 * various queue flags, see QUEUE_* below 425 */ 426 unsigned long queue_flags; 427 /* 428 * Number of contexts that have called blk_set_pm_only(). If this 429 * counter is above zero then only RQF_PM requests are processed. 430 */ 431 atomic_t pm_only; 432 433 /* 434 * ida allocated id for this queue. Used to index queues from 435 * ioctx. 436 */ 437 int id; 438 439 /* 440 * queue needs bounce pages for pages above this limit 441 */ 442 gfp_t bounce_gfp; 443 444 spinlock_t queue_lock; 445 446 /* 447 * queue kobject 448 */ 449 struct kobject kobj; 450 451 /* 452 * mq queue kobject 453 */ 454 struct kobject *mq_kobj; 455 456 #ifdef CONFIG_BLK_DEV_INTEGRITY 457 struct blk_integrity integrity; 458 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 459 460 #ifdef CONFIG_PM 461 struct device *dev; 462 enum rpm_status rpm_status; 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 atomic_t nr_active_requests_shared_sbitmap; 488 489 struct list_head icq_list; 490 #ifdef CONFIG_BLK_CGROUP 491 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 492 struct blkcg_gq *root_blkg; 493 struct list_head blkg_list; 494 #endif 495 496 struct queue_limits limits; 497 498 unsigned int required_elevator_features; 499 500 #ifdef CONFIG_BLK_DEV_ZONED 501 /* 502 * Zoned block device information for request dispatch control. 503 * nr_zones is the total number of zones of the device. This is always 504 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 505 * bits which indicates if a zone is conventional (bit set) or 506 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 507 * bits which indicates if a zone is write locked, that is, if a write 508 * request targeting the zone was dispatched. All three fields are 509 * initialized by the low level device driver (e.g. scsi/sd.c). 510 * Stacking drivers (device mappers) may or may not initialize 511 * these fields. 512 * 513 * Reads of this information must be protected with blk_queue_enter() / 514 * blk_queue_exit(). Modifying this information is only allowed while 515 * no requests are being processed. See also blk_mq_freeze_queue() and 516 * blk_mq_unfreeze_queue(). 517 */ 518 unsigned int nr_zones; 519 unsigned long *conv_zones_bitmap; 520 unsigned long *seq_zones_wlock; 521 unsigned int max_open_zones; 522 unsigned int max_active_zones; 523 #endif /* CONFIG_BLK_DEV_ZONED */ 524 525 /* 526 * sg stuff 527 */ 528 unsigned int sg_timeout; 529 unsigned int sg_reserved_size; 530 int node; 531 struct mutex debugfs_mutex; 532 #ifdef CONFIG_BLK_DEV_IO_TRACE 533 struct blk_trace __rcu *blk_trace; 534 #endif 535 /* 536 * for flush operations 537 */ 538 struct blk_flush_queue *fq; 539 540 struct list_head requeue_list; 541 spinlock_t requeue_lock; 542 struct delayed_work requeue_work; 543 544 struct mutex sysfs_lock; 545 struct mutex sysfs_dir_lock; 546 547 /* 548 * for reusing dead hctx instance in case of updating 549 * nr_hw_queues 550 */ 551 struct list_head unused_hctx_list; 552 spinlock_t unused_hctx_lock; 553 554 int mq_freeze_depth; 555 556 #if defined(CONFIG_BLK_DEV_BSG) 557 struct bsg_class_device bsg_dev; 558 #endif 559 560 #ifdef CONFIG_BLK_DEV_THROTTLING 561 /* Throttle data */ 562 struct throtl_data *td; 563 #endif 564 struct rcu_head rcu_head; 565 wait_queue_head_t mq_freeze_wq; 566 /* 567 * Protect concurrent access to q_usage_counter by 568 * percpu_ref_kill() and percpu_ref_reinit(). 569 */ 570 struct mutex mq_freeze_lock; 571 572 struct blk_mq_tag_set *tag_set; 573 struct list_head tag_set_list; 574 struct bio_set bio_split; 575 576 struct dentry *debugfs_dir; 577 578 #ifdef CONFIG_BLK_DEBUG_FS 579 struct dentry *sched_debugfs_dir; 580 struct dentry *rqos_debugfs_dir; 581 #endif 582 583 bool mq_sysfs_init_done; 584 585 size_t cmd_size; 586 587 #define BLK_MAX_WRITE_HINTS 5 588 u64 write_hints[BLK_MAX_WRITE_HINTS]; 589 }; 590 591 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 592 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 593 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 594 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 595 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 596 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 597 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 598 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 599 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 600 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ 601 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 602 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 603 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ 604 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 605 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 606 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 607 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 608 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 609 #define QUEUE_FLAG_WC 17 /* Write back caching */ 610 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 611 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 612 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 613 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ 614 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 615 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ 616 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 617 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 618 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 619 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 620 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 621 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 622 623 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 624 (1 << QUEUE_FLAG_SAME_COMP) | \ 625 (1 << QUEUE_FLAG_NOWAIT)) 626 627 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 628 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 629 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 630 631 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 632 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 633 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 634 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 635 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 636 #define blk_queue_noxmerges(q) \ 637 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 638 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 639 #define blk_queue_stable_writes(q) \ 640 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 641 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 642 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 643 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 644 #define blk_queue_zone_resetall(q) \ 645 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 646 #define blk_queue_secure_erase(q) \ 647 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 648 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 649 #define blk_queue_scsi_passthrough(q) \ 650 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 651 #define blk_queue_pci_p2pdma(q) \ 652 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 653 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 654 #define blk_queue_rq_alloc_time(q) \ 655 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 656 #else 657 #define blk_queue_rq_alloc_time(q) false 658 #endif 659 660 #define blk_noretry_request(rq) \ 661 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 662 REQ_FAILFAST_DRIVER)) 663 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 664 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 665 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 666 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 667 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) 668 669 extern void blk_set_pm_only(struct request_queue *q); 670 extern void blk_clear_pm_only(struct request_queue *q); 671 672 static inline bool blk_account_rq(struct request *rq) 673 { 674 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 675 } 676 677 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 678 679 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 680 681 #define rq_dma_dir(rq) \ 682 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 683 684 #define dma_map_bvec(dev, bv, dir, attrs) \ 685 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 686 (dir), (attrs)) 687 688 static inline bool queue_is_mq(struct request_queue *q) 689 { 690 return q->mq_ops; 691 } 692 693 #ifdef CONFIG_PM 694 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 695 { 696 return q->rpm_status; 697 } 698 #else 699 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 700 { 701 return RPM_ACTIVE; 702 } 703 #endif 704 705 static inline enum blk_zoned_model 706 blk_queue_zoned_model(struct request_queue *q) 707 { 708 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) 709 return q->limits.zoned; 710 return BLK_ZONED_NONE; 711 } 712 713 static inline bool blk_queue_is_zoned(struct request_queue *q) 714 { 715 switch (blk_queue_zoned_model(q)) { 716 case BLK_ZONED_HA: 717 case BLK_ZONED_HM: 718 return true; 719 default: 720 return false; 721 } 722 } 723 724 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 725 { 726 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 727 } 728 729 #ifdef CONFIG_BLK_DEV_ZONED 730 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 731 { 732 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 733 } 734 735 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 736 sector_t sector) 737 { 738 if (!blk_queue_is_zoned(q)) 739 return 0; 740 return sector >> ilog2(q->limits.chunk_sectors); 741 } 742 743 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 744 sector_t sector) 745 { 746 if (!blk_queue_is_zoned(q)) 747 return false; 748 if (!q->conv_zones_bitmap) 749 return true; 750 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 751 } 752 753 static inline void blk_queue_max_open_zones(struct request_queue *q, 754 unsigned int max_open_zones) 755 { 756 q->max_open_zones = max_open_zones; 757 } 758 759 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 760 { 761 return q->max_open_zones; 762 } 763 764 static inline void blk_queue_max_active_zones(struct request_queue *q, 765 unsigned int max_active_zones) 766 { 767 q->max_active_zones = max_active_zones; 768 } 769 770 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 771 { 772 return q->max_active_zones; 773 } 774 #else /* CONFIG_BLK_DEV_ZONED */ 775 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 776 { 777 return 0; 778 } 779 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 780 sector_t sector) 781 { 782 return false; 783 } 784 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 785 sector_t sector) 786 { 787 return 0; 788 } 789 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 790 { 791 return 0; 792 } 793 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 794 { 795 return 0; 796 } 797 #endif /* CONFIG_BLK_DEV_ZONED */ 798 799 static inline bool rq_is_sync(struct request *rq) 800 { 801 return op_is_sync(rq->cmd_flags); 802 } 803 804 static inline bool rq_mergeable(struct request *rq) 805 { 806 if (blk_rq_is_passthrough(rq)) 807 return false; 808 809 if (req_op(rq) == REQ_OP_FLUSH) 810 return false; 811 812 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 813 return false; 814 815 if (req_op(rq) == REQ_OP_ZONE_APPEND) 816 return false; 817 818 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 819 return false; 820 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 821 return false; 822 823 return true; 824 } 825 826 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 827 { 828 if (bio_page(a) == bio_page(b) && 829 bio_offset(a) == bio_offset(b)) 830 return true; 831 832 return false; 833 } 834 835 static inline unsigned int blk_queue_depth(struct request_queue *q) 836 { 837 if (q->queue_depth) 838 return q->queue_depth; 839 840 return q->nr_requests; 841 } 842 843 extern unsigned long blk_max_low_pfn, blk_max_pfn; 844 845 /* 846 * standard bounce addresses: 847 * 848 * BLK_BOUNCE_HIGH : bounce all highmem pages 849 * BLK_BOUNCE_ANY : don't bounce anything 850 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 851 */ 852 853 #if BITS_PER_LONG == 32 854 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 855 #else 856 #define BLK_BOUNCE_HIGH -1ULL 857 #endif 858 #define BLK_BOUNCE_ANY (-1ULL) 859 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 860 861 /* 862 * default timeout for SG_IO if none specified 863 */ 864 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 865 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 866 867 struct rq_map_data { 868 struct page **pages; 869 int page_order; 870 int nr_entries; 871 unsigned long offset; 872 int null_mapped; 873 int from_user; 874 }; 875 876 struct req_iterator { 877 struct bvec_iter iter; 878 struct bio *bio; 879 }; 880 881 /* This should not be used directly - use rq_for_each_segment */ 882 #define for_each_bio(_bio) \ 883 for (; _bio; _bio = _bio->bi_next) 884 #define __rq_for_each_bio(_bio, rq) \ 885 if ((rq->bio)) \ 886 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 887 888 #define rq_for_each_segment(bvl, _rq, _iter) \ 889 __rq_for_each_bio(_iter.bio, _rq) \ 890 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 891 892 #define rq_for_each_bvec(bvl, _rq, _iter) \ 893 __rq_for_each_bio(_iter.bio, _rq) \ 894 bio_for_each_bvec(bvl, _iter.bio, _iter.iter) 895 896 #define rq_iter_last(bvec, _iter) \ 897 (_iter.bio->bi_next == NULL && \ 898 bio_iter_last(bvec, _iter.iter)) 899 900 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 901 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 902 #endif 903 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 904 extern void rq_flush_dcache_pages(struct request *rq); 905 #else 906 static inline void rq_flush_dcache_pages(struct request *rq) 907 { 908 } 909 #endif 910 911 extern int blk_register_queue(struct gendisk *disk); 912 extern void blk_unregister_queue(struct gendisk *disk); 913 blk_qc_t submit_bio_noacct(struct bio *bio); 914 extern void blk_rq_init(struct request_queue *q, struct request *rq); 915 extern void blk_put_request(struct request *); 916 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 917 blk_mq_req_flags_t flags); 918 extern int blk_lld_busy(struct request_queue *q); 919 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 920 struct bio_set *bs, gfp_t gfp_mask, 921 int (*bio_ctr)(struct bio *, struct bio *, void *), 922 void *data); 923 extern void blk_rq_unprep_clone(struct request *rq); 924 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 925 struct request *rq); 926 extern int blk_rq_append_bio(struct request *rq, struct bio **bio); 927 extern void blk_queue_split(struct bio **); 928 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 929 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 930 unsigned int, void __user *); 931 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 932 unsigned int, void __user *); 933 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 934 struct scsi_ioctl_command __user *); 935 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); 936 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); 937 938 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 939 extern void blk_queue_exit(struct request_queue *q); 940 extern void blk_sync_queue(struct request_queue *q); 941 extern int blk_rq_map_user(struct request_queue *, struct request *, 942 struct rq_map_data *, void __user *, unsigned long, 943 gfp_t); 944 extern int blk_rq_unmap_user(struct bio *); 945 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 946 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 947 struct rq_map_data *, const struct iov_iter *, 948 gfp_t); 949 extern void blk_execute_rq(struct gendisk *, struct request *, int); 950 extern void blk_execute_rq_nowait(struct gendisk *, 951 struct request *, int, rq_end_io_fn *); 952 953 /* Helper to convert REQ_OP_XXX to its string format XXX */ 954 extern const char *blk_op_str(unsigned int op); 955 956 int blk_status_to_errno(blk_status_t status); 957 blk_status_t errno_to_blk_status(int errno); 958 959 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); 960 961 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 962 { 963 return bdev->bd_disk->queue; /* this is never NULL */ 964 } 965 966 /* 967 * The basic unit of block I/O is a sector. It is used in a number of contexts 968 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 969 * bytes. Variables of type sector_t represent an offset or size that is a 970 * multiple of 512 bytes. Hence these two constants. 971 */ 972 #ifndef SECTOR_SHIFT 973 #define SECTOR_SHIFT 9 974 #endif 975 #ifndef SECTOR_SIZE 976 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 977 #endif 978 979 /* 980 * blk_rq_pos() : the current sector 981 * blk_rq_bytes() : bytes left in the entire request 982 * blk_rq_cur_bytes() : bytes left in the current segment 983 * blk_rq_err_bytes() : bytes left till the next error boundary 984 * blk_rq_sectors() : sectors left in the entire request 985 * blk_rq_cur_sectors() : sectors left in the current segment 986 * blk_rq_stats_sectors() : sectors of the entire request used for stats 987 */ 988 static inline sector_t blk_rq_pos(const struct request *rq) 989 { 990 return rq->__sector; 991 } 992 993 static inline unsigned int blk_rq_bytes(const struct request *rq) 994 { 995 return rq->__data_len; 996 } 997 998 static inline int blk_rq_cur_bytes(const struct request *rq) 999 { 1000 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 1001 } 1002 1003 extern unsigned int blk_rq_err_bytes(const struct request *rq); 1004 1005 static inline unsigned int blk_rq_sectors(const struct request *rq) 1006 { 1007 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 1008 } 1009 1010 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 1011 { 1012 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 1013 } 1014 1015 static inline unsigned int blk_rq_stats_sectors(const struct request *rq) 1016 { 1017 return rq->stats_sectors; 1018 } 1019 1020 #ifdef CONFIG_BLK_DEV_ZONED 1021 1022 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 1023 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 1024 1025 static inline unsigned int blk_rq_zone_no(struct request *rq) 1026 { 1027 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1028 } 1029 1030 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1031 { 1032 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1033 } 1034 #endif /* CONFIG_BLK_DEV_ZONED */ 1035 1036 /* 1037 * Some commands like WRITE SAME have a payload or data transfer size which 1038 * is different from the size of the request. Any driver that supports such 1039 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1040 * calculate the data transfer size. 1041 */ 1042 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1043 { 1044 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1045 return rq->special_vec.bv_len; 1046 return blk_rq_bytes(rq); 1047 } 1048 1049 /* 1050 * Return the first full biovec in the request. The caller needs to check that 1051 * there are any bvecs before calling this helper. 1052 */ 1053 static inline struct bio_vec req_bvec(struct request *rq) 1054 { 1055 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1056 return rq->special_vec; 1057 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); 1058 } 1059 1060 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1061 int op) 1062 { 1063 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1064 return min(q->limits.max_discard_sectors, 1065 UINT_MAX >> SECTOR_SHIFT); 1066 1067 if (unlikely(op == REQ_OP_WRITE_SAME)) 1068 return q->limits.max_write_same_sectors; 1069 1070 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1071 return q->limits.max_write_zeroes_sectors; 1072 1073 return q->limits.max_sectors; 1074 } 1075 1076 /* 1077 * Return maximum size of a request at given offset. Only valid for 1078 * file system requests. 1079 */ 1080 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1081 sector_t offset, 1082 unsigned int chunk_sectors) 1083 { 1084 if (!chunk_sectors) { 1085 if (q->limits.chunk_sectors) 1086 chunk_sectors = q->limits.chunk_sectors; 1087 else 1088 return q->limits.max_sectors; 1089 } 1090 1091 if (likely(is_power_of_2(chunk_sectors))) 1092 chunk_sectors -= offset & (chunk_sectors - 1); 1093 else 1094 chunk_sectors -= sector_div(offset, chunk_sectors); 1095 1096 return min(q->limits.max_sectors, chunk_sectors); 1097 } 1098 1099 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1100 sector_t offset) 1101 { 1102 struct request_queue *q = rq->q; 1103 1104 if (blk_rq_is_passthrough(rq)) 1105 return q->limits.max_hw_sectors; 1106 1107 if (!q->limits.chunk_sectors || 1108 req_op(rq) == REQ_OP_DISCARD || 1109 req_op(rq) == REQ_OP_SECURE_ERASE) 1110 return blk_queue_get_max_sectors(q, req_op(rq)); 1111 1112 return min(blk_max_size_offset(q, offset, 0), 1113 blk_queue_get_max_sectors(q, req_op(rq))); 1114 } 1115 1116 static inline unsigned int blk_rq_count_bios(struct request *rq) 1117 { 1118 unsigned int nr_bios = 0; 1119 struct bio *bio; 1120 1121 __rq_for_each_bio(bio, rq) 1122 nr_bios++; 1123 1124 return nr_bios; 1125 } 1126 1127 void blk_steal_bios(struct bio_list *list, struct request *rq); 1128 1129 /* 1130 * Request completion related functions. 1131 * 1132 * blk_update_request() completes given number of bytes and updates 1133 * the request without completing it. 1134 */ 1135 extern bool blk_update_request(struct request *rq, blk_status_t error, 1136 unsigned int nr_bytes); 1137 1138 extern void blk_abort_request(struct request *); 1139 1140 /* 1141 * Access functions for manipulating queue properties 1142 */ 1143 extern void blk_cleanup_queue(struct request_queue *); 1144 extern void blk_queue_bounce_limit(struct request_queue *, u64); 1145 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1146 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1147 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1148 extern void blk_queue_max_discard_segments(struct request_queue *, 1149 unsigned short); 1150 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1151 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1152 unsigned int max_discard_sectors); 1153 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1154 unsigned int max_write_same_sectors); 1155 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1156 unsigned int max_write_same_sectors); 1157 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 1158 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 1159 unsigned int max_zone_append_sectors); 1160 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1161 void blk_queue_zone_write_granularity(struct request_queue *q, 1162 unsigned int size); 1163 extern void blk_queue_alignment_offset(struct request_queue *q, 1164 unsigned int alignment); 1165 void blk_queue_update_readahead(struct request_queue *q); 1166 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1167 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1168 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1169 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1170 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1171 extern void blk_set_default_limits(struct queue_limits *lim); 1172 extern void blk_set_stacking_limits(struct queue_limits *lim); 1173 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1174 sector_t offset); 1175 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1176 sector_t offset); 1177 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1178 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1179 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1180 extern void blk_queue_dma_alignment(struct request_queue *, int); 1181 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1182 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1183 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1184 extern void blk_queue_required_elevator_features(struct request_queue *q, 1185 unsigned int features); 1186 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1187 struct device *dev); 1188 1189 /* 1190 * Number of physical segments as sent to the device. 1191 * 1192 * Normally this is the number of discontiguous data segments sent by the 1193 * submitter. But for data-less command like discard we might have no 1194 * actual data segments submitted, but the driver might have to add it's 1195 * own special payload. In that case we still return 1 here so that this 1196 * special payload will be mapped. 1197 */ 1198 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1199 { 1200 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1201 return 1; 1202 return rq->nr_phys_segments; 1203 } 1204 1205 /* 1206 * Number of discard segments (or ranges) the driver needs to fill in. 1207 * Each discard bio merged into a request is counted as one segment. 1208 */ 1209 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1210 { 1211 return max_t(unsigned short, rq->nr_phys_segments, 1); 1212 } 1213 1214 int __blk_rq_map_sg(struct request_queue *q, struct request *rq, 1215 struct scatterlist *sglist, struct scatterlist **last_sg); 1216 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, 1217 struct scatterlist *sglist) 1218 { 1219 struct scatterlist *last_sg = NULL; 1220 1221 return __blk_rq_map_sg(q, rq, sglist, &last_sg); 1222 } 1223 extern void blk_dump_rq_flags(struct request *, char *); 1224 1225 bool __must_check blk_get_queue(struct request_queue *); 1226 struct request_queue *blk_alloc_queue(int node_id); 1227 extern void blk_put_queue(struct request_queue *); 1228 extern void blk_set_queue_dying(struct request_queue *); 1229 1230 #ifdef CONFIG_BLOCK 1231 /* 1232 * blk_plug permits building a queue of related requests by holding the I/O 1233 * fragments for a short period. This allows merging of sequential requests 1234 * into single larger request. As the requests are moved from a per-task list to 1235 * the device's request_queue in a batch, this results in improved scalability 1236 * as the lock contention for request_queue lock is reduced. 1237 * 1238 * It is ok not to disable preemption when adding the request to the plug list 1239 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1240 * the plug list when the task sleeps by itself. For details, please see 1241 * schedule() where blk_schedule_flush_plug() is called. 1242 */ 1243 struct blk_plug { 1244 struct list_head mq_list; /* blk-mq requests */ 1245 struct list_head cb_list; /* md requires an unplug callback */ 1246 unsigned short rq_count; 1247 bool multiple_queues; 1248 bool nowait; 1249 }; 1250 #define BLK_MAX_REQUEST_COUNT 16 1251 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1252 1253 struct blk_plug_cb; 1254 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1255 struct blk_plug_cb { 1256 struct list_head list; 1257 blk_plug_cb_fn callback; 1258 void *data; 1259 }; 1260 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1261 void *data, int size); 1262 extern void blk_start_plug(struct blk_plug *); 1263 extern void blk_finish_plug(struct blk_plug *); 1264 extern void blk_flush_plug_list(struct blk_plug *, bool); 1265 1266 static inline void blk_flush_plug(struct task_struct *tsk) 1267 { 1268 struct blk_plug *plug = tsk->plug; 1269 1270 if (plug) 1271 blk_flush_plug_list(plug, false); 1272 } 1273 1274 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1275 { 1276 struct blk_plug *plug = tsk->plug; 1277 1278 if (plug) 1279 blk_flush_plug_list(plug, true); 1280 } 1281 1282 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1283 { 1284 struct blk_plug *plug = tsk->plug; 1285 1286 return plug && 1287 (!list_empty(&plug->mq_list) || 1288 !list_empty(&plug->cb_list)); 1289 } 1290 1291 int blkdev_issue_flush(struct block_device *bdev); 1292 long nr_blockdev_pages(void); 1293 #else /* CONFIG_BLOCK */ 1294 struct blk_plug { 1295 }; 1296 1297 static inline void blk_start_plug(struct blk_plug *plug) 1298 { 1299 } 1300 1301 static inline void blk_finish_plug(struct blk_plug *plug) 1302 { 1303 } 1304 1305 static inline void blk_flush_plug(struct task_struct *task) 1306 { 1307 } 1308 1309 static inline void blk_schedule_flush_plug(struct task_struct *task) 1310 { 1311 } 1312 1313 1314 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1315 { 1316 return false; 1317 } 1318 1319 static inline int blkdev_issue_flush(struct block_device *bdev) 1320 { 1321 return 0; 1322 } 1323 1324 static inline long nr_blockdev_pages(void) 1325 { 1326 return 0; 1327 } 1328 #endif /* CONFIG_BLOCK */ 1329 1330 extern void blk_io_schedule(void); 1331 1332 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1333 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1334 1335 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1336 1337 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1338 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1339 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1340 sector_t nr_sects, gfp_t gfp_mask, int flags, 1341 struct bio **biop); 1342 1343 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1344 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1345 1346 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1347 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1348 unsigned flags); 1349 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1350 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1351 1352 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1353 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1354 { 1355 return blkdev_issue_discard(sb->s_bdev, 1356 block << (sb->s_blocksize_bits - 1357 SECTOR_SHIFT), 1358 nr_blocks << (sb->s_blocksize_bits - 1359 SECTOR_SHIFT), 1360 gfp_mask, flags); 1361 } 1362 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1363 sector_t nr_blocks, gfp_t gfp_mask) 1364 { 1365 return blkdev_issue_zeroout(sb->s_bdev, 1366 block << (sb->s_blocksize_bits - 1367 SECTOR_SHIFT), 1368 nr_blocks << (sb->s_blocksize_bits - 1369 SECTOR_SHIFT), 1370 gfp_mask, 0); 1371 } 1372 1373 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1374 1375 static inline bool bdev_is_partition(struct block_device *bdev) 1376 { 1377 return bdev->bd_partno; 1378 } 1379 1380 enum blk_default_limits { 1381 BLK_MAX_SEGMENTS = 128, 1382 BLK_SAFE_MAX_SECTORS = 255, 1383 BLK_DEF_MAX_SECTORS = 2560, 1384 BLK_MAX_SEGMENT_SIZE = 65536, 1385 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1386 }; 1387 1388 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1389 { 1390 return q->limits.seg_boundary_mask; 1391 } 1392 1393 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1394 { 1395 return q->limits.virt_boundary_mask; 1396 } 1397 1398 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1399 { 1400 return q->limits.max_sectors; 1401 } 1402 1403 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1404 { 1405 return q->limits.max_hw_sectors; 1406 } 1407 1408 static inline unsigned short queue_max_segments(const struct request_queue *q) 1409 { 1410 return q->limits.max_segments; 1411 } 1412 1413 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1414 { 1415 return q->limits.max_discard_segments; 1416 } 1417 1418 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1419 { 1420 return q->limits.max_segment_size; 1421 } 1422 1423 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1424 { 1425 1426 const struct queue_limits *l = &q->limits; 1427 1428 return min(l->max_zone_append_sectors, l->max_sectors); 1429 } 1430 1431 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1432 { 1433 int retval = 512; 1434 1435 if (q && q->limits.logical_block_size) 1436 retval = q->limits.logical_block_size; 1437 1438 return retval; 1439 } 1440 1441 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1442 { 1443 return queue_logical_block_size(bdev_get_queue(bdev)); 1444 } 1445 1446 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1447 { 1448 return q->limits.physical_block_size; 1449 } 1450 1451 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1452 { 1453 return queue_physical_block_size(bdev_get_queue(bdev)); 1454 } 1455 1456 static inline unsigned int queue_io_min(const struct request_queue *q) 1457 { 1458 return q->limits.io_min; 1459 } 1460 1461 static inline int bdev_io_min(struct block_device *bdev) 1462 { 1463 return queue_io_min(bdev_get_queue(bdev)); 1464 } 1465 1466 static inline unsigned int queue_io_opt(const struct request_queue *q) 1467 { 1468 return q->limits.io_opt; 1469 } 1470 1471 static inline int bdev_io_opt(struct block_device *bdev) 1472 { 1473 return queue_io_opt(bdev_get_queue(bdev)); 1474 } 1475 1476 static inline unsigned int 1477 queue_zone_write_granularity(const struct request_queue *q) 1478 { 1479 return q->limits.zone_write_granularity; 1480 } 1481 1482 static inline unsigned int 1483 bdev_zone_write_granularity(struct block_device *bdev) 1484 { 1485 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1486 } 1487 1488 static inline int queue_alignment_offset(const struct request_queue *q) 1489 { 1490 if (q->limits.misaligned) 1491 return -1; 1492 1493 return q->limits.alignment_offset; 1494 } 1495 1496 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1497 { 1498 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1499 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1500 << SECTOR_SHIFT; 1501 1502 return (granularity + lim->alignment_offset - alignment) % granularity; 1503 } 1504 1505 static inline int bdev_alignment_offset(struct block_device *bdev) 1506 { 1507 struct request_queue *q = bdev_get_queue(bdev); 1508 1509 if (q->limits.misaligned) 1510 return -1; 1511 if (bdev_is_partition(bdev)) 1512 return queue_limit_alignment_offset(&q->limits, 1513 bdev->bd_start_sect); 1514 return q->limits.alignment_offset; 1515 } 1516 1517 static inline int queue_discard_alignment(const struct request_queue *q) 1518 { 1519 if (q->limits.discard_misaligned) 1520 return -1; 1521 1522 return q->limits.discard_alignment; 1523 } 1524 1525 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1526 { 1527 unsigned int alignment, granularity, offset; 1528 1529 if (!lim->max_discard_sectors) 1530 return 0; 1531 1532 /* Why are these in bytes, not sectors? */ 1533 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1534 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1535 if (!granularity) 1536 return 0; 1537 1538 /* Offset of the partition start in 'granularity' sectors */ 1539 offset = sector_div(sector, granularity); 1540 1541 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1542 offset = (granularity + alignment - offset) % granularity; 1543 1544 /* Turn it back into bytes, gaah */ 1545 return offset << SECTOR_SHIFT; 1546 } 1547 1548 static inline int bdev_discard_alignment(struct block_device *bdev) 1549 { 1550 struct request_queue *q = bdev_get_queue(bdev); 1551 1552 if (bdev_is_partition(bdev)) 1553 return queue_limit_discard_alignment(&q->limits, 1554 bdev->bd_start_sect); 1555 return q->limits.discard_alignment; 1556 } 1557 1558 static inline unsigned int bdev_write_same(struct block_device *bdev) 1559 { 1560 struct request_queue *q = bdev_get_queue(bdev); 1561 1562 if (q) 1563 return q->limits.max_write_same_sectors; 1564 1565 return 0; 1566 } 1567 1568 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1569 { 1570 struct request_queue *q = bdev_get_queue(bdev); 1571 1572 if (q) 1573 return q->limits.max_write_zeroes_sectors; 1574 1575 return 0; 1576 } 1577 1578 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1579 { 1580 struct request_queue *q = bdev_get_queue(bdev); 1581 1582 if (q) 1583 return blk_queue_zoned_model(q); 1584 1585 return BLK_ZONED_NONE; 1586 } 1587 1588 static inline bool bdev_is_zoned(struct block_device *bdev) 1589 { 1590 struct request_queue *q = bdev_get_queue(bdev); 1591 1592 if (q) 1593 return blk_queue_is_zoned(q); 1594 1595 return false; 1596 } 1597 1598 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1599 { 1600 struct request_queue *q = bdev_get_queue(bdev); 1601 1602 if (q) 1603 return blk_queue_zone_sectors(q); 1604 return 0; 1605 } 1606 1607 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1608 { 1609 struct request_queue *q = bdev_get_queue(bdev); 1610 1611 if (q) 1612 return queue_max_open_zones(q); 1613 return 0; 1614 } 1615 1616 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1617 { 1618 struct request_queue *q = bdev_get_queue(bdev); 1619 1620 if (q) 1621 return queue_max_active_zones(q); 1622 return 0; 1623 } 1624 1625 static inline int queue_dma_alignment(const struct request_queue *q) 1626 { 1627 return q ? q->dma_alignment : 511; 1628 } 1629 1630 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1631 unsigned int len) 1632 { 1633 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1634 return !(addr & alignment) && !(len & alignment); 1635 } 1636 1637 /* assumes size > 256 */ 1638 static inline unsigned int blksize_bits(unsigned int size) 1639 { 1640 unsigned int bits = 8; 1641 do { 1642 bits++; 1643 size >>= 1; 1644 } while (size > 256); 1645 return bits; 1646 } 1647 1648 static inline unsigned int block_size(struct block_device *bdev) 1649 { 1650 return 1 << bdev->bd_inode->i_blkbits; 1651 } 1652 1653 int kblockd_schedule_work(struct work_struct *work); 1654 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1655 1656 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1657 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1658 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1659 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1660 1661 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1662 1663 enum blk_integrity_flags { 1664 BLK_INTEGRITY_VERIFY = 1 << 0, 1665 BLK_INTEGRITY_GENERATE = 1 << 1, 1666 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1667 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1668 }; 1669 1670 struct blk_integrity_iter { 1671 void *prot_buf; 1672 void *data_buf; 1673 sector_t seed; 1674 unsigned int data_size; 1675 unsigned short interval; 1676 const char *disk_name; 1677 }; 1678 1679 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1680 typedef void (integrity_prepare_fn) (struct request *); 1681 typedef void (integrity_complete_fn) (struct request *, unsigned int); 1682 1683 struct blk_integrity_profile { 1684 integrity_processing_fn *generate_fn; 1685 integrity_processing_fn *verify_fn; 1686 integrity_prepare_fn *prepare_fn; 1687 integrity_complete_fn *complete_fn; 1688 const char *name; 1689 }; 1690 1691 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1692 extern void blk_integrity_unregister(struct gendisk *); 1693 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1694 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1695 struct scatterlist *); 1696 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1697 1698 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1699 { 1700 struct blk_integrity *bi = &disk->queue->integrity; 1701 1702 if (!bi->profile) 1703 return NULL; 1704 1705 return bi; 1706 } 1707 1708 static inline 1709 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1710 { 1711 return blk_get_integrity(bdev->bd_disk); 1712 } 1713 1714 static inline bool 1715 blk_integrity_queue_supports_integrity(struct request_queue *q) 1716 { 1717 return q->integrity.profile; 1718 } 1719 1720 static inline bool blk_integrity_rq(struct request *rq) 1721 { 1722 return rq->cmd_flags & REQ_INTEGRITY; 1723 } 1724 1725 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1726 unsigned int segs) 1727 { 1728 q->limits.max_integrity_segments = segs; 1729 } 1730 1731 static inline unsigned short 1732 queue_max_integrity_segments(const struct request_queue *q) 1733 { 1734 return q->limits.max_integrity_segments; 1735 } 1736 1737 /** 1738 * bio_integrity_intervals - Return number of integrity intervals for a bio 1739 * @bi: blk_integrity profile for device 1740 * @sectors: Size of the bio in 512-byte sectors 1741 * 1742 * Description: The block layer calculates everything in 512 byte 1743 * sectors but integrity metadata is done in terms of the data integrity 1744 * interval size of the storage device. Convert the block layer sectors 1745 * to the appropriate number of integrity intervals. 1746 */ 1747 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1748 unsigned int sectors) 1749 { 1750 return sectors >> (bi->interval_exp - 9); 1751 } 1752 1753 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1754 unsigned int sectors) 1755 { 1756 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1757 } 1758 1759 /* 1760 * Return the first bvec that contains integrity data. Only drivers that are 1761 * limited to a single integrity segment should use this helper. 1762 */ 1763 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1764 { 1765 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) 1766 return NULL; 1767 return rq->bio->bi_integrity->bip_vec; 1768 } 1769 1770 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1771 1772 struct bio; 1773 struct block_device; 1774 struct gendisk; 1775 struct blk_integrity; 1776 1777 static inline int blk_integrity_rq(struct request *rq) 1778 { 1779 return 0; 1780 } 1781 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1782 struct bio *b) 1783 { 1784 return 0; 1785 } 1786 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1787 struct bio *b, 1788 struct scatterlist *s) 1789 { 1790 return 0; 1791 } 1792 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1793 { 1794 return NULL; 1795 } 1796 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1797 { 1798 return NULL; 1799 } 1800 static inline bool 1801 blk_integrity_queue_supports_integrity(struct request_queue *q) 1802 { 1803 return false; 1804 } 1805 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1806 { 1807 return 0; 1808 } 1809 static inline void blk_integrity_register(struct gendisk *d, 1810 struct blk_integrity *b) 1811 { 1812 } 1813 static inline void blk_integrity_unregister(struct gendisk *d) 1814 { 1815 } 1816 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1817 unsigned int segs) 1818 { 1819 } 1820 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) 1821 { 1822 return 0; 1823 } 1824 1825 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1826 unsigned int sectors) 1827 { 1828 return 0; 1829 } 1830 1831 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1832 unsigned int sectors) 1833 { 1834 return 0; 1835 } 1836 1837 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1838 { 1839 return NULL; 1840 } 1841 1842 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1843 1844 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1845 1846 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); 1847 1848 void blk_ksm_unregister(struct request_queue *q); 1849 1850 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1851 1852 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, 1853 struct request_queue *q) 1854 { 1855 return true; 1856 } 1857 1858 static inline void blk_ksm_unregister(struct request_queue *q) { } 1859 1860 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1861 1862 1863 struct block_device_operations { 1864 blk_qc_t (*submit_bio) (struct bio *bio); 1865 int (*open) (struct block_device *, fmode_t); 1866 void (*release) (struct gendisk *, fmode_t); 1867 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1868 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1869 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1870 unsigned int (*check_events) (struct gendisk *disk, 1871 unsigned int clearing); 1872 void (*unlock_native_capacity) (struct gendisk *); 1873 int (*revalidate_disk) (struct gendisk *); 1874 int (*getgeo)(struct block_device *, struct hd_geometry *); 1875 int (*set_read_only)(struct block_device *bdev, bool ro); 1876 /* this callback is with swap_lock and sometimes page table lock held */ 1877 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1878 int (*report_zones)(struct gendisk *, sector_t sector, 1879 unsigned int nr_zones, report_zones_cb cb, void *data); 1880 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1881 struct module *owner; 1882 const struct pr_ops *pr_ops; 1883 }; 1884 1885 #ifdef CONFIG_COMPAT 1886 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1887 unsigned int, unsigned long); 1888 #else 1889 #define blkdev_compat_ptr_ioctl NULL 1890 #endif 1891 1892 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1893 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1894 struct writeback_control *); 1895 1896 #ifdef CONFIG_BLK_DEV_ZONED 1897 bool blk_req_needs_zone_write_lock(struct request *rq); 1898 bool blk_req_zone_write_trylock(struct request *rq); 1899 void __blk_req_zone_write_lock(struct request *rq); 1900 void __blk_req_zone_write_unlock(struct request *rq); 1901 1902 static inline void blk_req_zone_write_lock(struct request *rq) 1903 { 1904 if (blk_req_needs_zone_write_lock(rq)) 1905 __blk_req_zone_write_lock(rq); 1906 } 1907 1908 static inline void blk_req_zone_write_unlock(struct request *rq) 1909 { 1910 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1911 __blk_req_zone_write_unlock(rq); 1912 } 1913 1914 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1915 { 1916 return rq->q->seq_zones_wlock && 1917 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1918 } 1919 1920 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1921 { 1922 if (!blk_req_needs_zone_write_lock(rq)) 1923 return true; 1924 return !blk_req_zone_is_write_locked(rq); 1925 } 1926 #else 1927 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1928 { 1929 return false; 1930 } 1931 1932 static inline void blk_req_zone_write_lock(struct request *rq) 1933 { 1934 } 1935 1936 static inline void blk_req_zone_write_unlock(struct request *rq) 1937 { 1938 } 1939 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1940 { 1941 return false; 1942 } 1943 1944 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1945 { 1946 return true; 1947 } 1948 #endif /* CONFIG_BLK_DEV_ZONED */ 1949 1950 static inline void blk_wake_io_task(struct task_struct *waiter) 1951 { 1952 /* 1953 * If we're polling, the task itself is doing the completions. For 1954 * that case, we don't need to signal a wakeup, it's enough to just 1955 * mark us as RUNNING. 1956 */ 1957 if (waiter == current) 1958 __set_current_state(TASK_RUNNING); 1959 else 1960 wake_up_process(waiter); 1961 } 1962 1963 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1964 unsigned int op); 1965 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1966 unsigned long start_time); 1967 1968 unsigned long bio_start_io_acct(struct bio *bio); 1969 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1970 struct block_device *orig_bdev); 1971 1972 /** 1973 * bio_end_io_acct - end I/O accounting for bio based drivers 1974 * @bio: bio to end account for 1975 * @start: start time returned by bio_start_io_acct() 1976 */ 1977 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1978 { 1979 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1980 } 1981 1982 int bdev_read_only(struct block_device *bdev); 1983 int set_blocksize(struct block_device *bdev, int size); 1984 1985 const char *bdevname(struct block_device *bdev, char *buffer); 1986 int lookup_bdev(const char *pathname, dev_t *dev); 1987 1988 void blkdev_show(struct seq_file *seqf, off_t offset); 1989 1990 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1991 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1992 #ifdef CONFIG_BLOCK 1993 #define BLKDEV_MAJOR_MAX 512 1994 #else 1995 #define BLKDEV_MAJOR_MAX 0 1996 #endif 1997 1998 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 1999 void *holder); 2000 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 2001 int bd_prepare_to_claim(struct block_device *bdev, void *holder); 2002 void bd_abort_claiming(struct block_device *bdev, void *holder); 2003 void blkdev_put(struct block_device *bdev, fmode_t mode); 2004 2005 /* just for blk-cgroup, don't use elsewhere */ 2006 struct block_device *blkdev_get_no_open(dev_t dev); 2007 void blkdev_put_no_open(struct block_device *bdev); 2008 2009 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 2010 void bdev_add(struct block_device *bdev, dev_t dev); 2011 struct block_device *I_BDEV(struct inode *inode); 2012 struct block_device *bdgrab(struct block_device *bdev); 2013 void bdput(struct block_device *); 2014 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 2015 loff_t lend); 2016 2017 #ifdef CONFIG_BLOCK 2018 void invalidate_bdev(struct block_device *bdev); 2019 int sync_blockdev(struct block_device *bdev); 2020 #else 2021 static inline void invalidate_bdev(struct block_device *bdev) 2022 { 2023 } 2024 static inline int sync_blockdev(struct block_device *bdev) 2025 { 2026 return 0; 2027 } 2028 #endif 2029 int fsync_bdev(struct block_device *bdev); 2030 2031 int freeze_bdev(struct block_device *bdev); 2032 int thaw_bdev(struct block_device *bdev); 2033 2034 #endif /* _LINUX_BLKDEV_H */ 2035