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/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 #include <linux/pm.h> 28 29 struct module; 30 struct scsi_ioctl_command; 31 32 struct request_queue; 33 struct elevator_queue; 34 struct blk_trace; 35 struct request; 36 struct sg_io_hdr; 37 struct bsg_job; 38 struct blkcg_gq; 39 struct blk_flush_queue; 40 struct pr_ops; 41 struct rq_qos; 42 struct blk_queue_stats; 43 struct blk_stat_callback; 44 struct blk_keyslot_manager; 45 46 #define BLKDEV_MIN_RQ 4 47 #define BLKDEV_MAX_RQ 128 /* Default maximum */ 48 49 /* Must be consistent with blk_mq_poll_stats_bkt() */ 50 #define BLK_MQ_POLL_STATS_BKTS 16 51 52 /* Doing classic polling */ 53 #define BLK_MQ_POLL_CLASSIC -1 54 55 /* 56 * Maximum number of blkcg policies allowed to be registered concurrently. 57 * Defined here to simplify include dependency. 58 */ 59 #define BLKCG_MAX_POLS 5 60 61 typedef void (rq_end_io_fn)(struct request *, blk_status_t); 62 63 /* 64 * request flags */ 65 typedef __u32 __bitwise req_flags_t; 66 67 /* drive already may have started this one */ 68 #define RQF_STARTED ((__force req_flags_t)(1 << 1)) 69 /* may not be passed by ioscheduler */ 70 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) 71 /* request for flush sequence */ 72 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) 73 /* merge of different types, fail separately */ 74 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) 75 /* track inflight for MQ */ 76 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) 77 /* don't call prep for this one */ 78 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) 79 /* vaguely specified driver internal error. Ignored by the block layer */ 80 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 81 /* don't warn about errors */ 82 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 83 /* elevator private data attached */ 84 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 85 /* account into disk and partition IO statistics */ 86 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 87 /* runtime pm request */ 88 #define RQF_PM ((__force req_flags_t)(1 << 15)) 89 /* on IO scheduler merge hash */ 90 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 91 /* track IO completion time */ 92 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 93 /* Look at ->special_vec for the actual data payload instead of the 94 bio chain. */ 95 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 96 /* The per-zone write lock is held for this request */ 97 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 98 /* already slept for hybrid poll */ 99 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 100 /* ->timeout has been called, don't expire again */ 101 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 102 103 /* flags that prevent us from merging requests: */ 104 #define RQF_NOMERGE_FLAGS \ 105 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 106 107 /* 108 * Request state for blk-mq. 109 */ 110 enum mq_rq_state { 111 MQ_RQ_IDLE = 0, 112 MQ_RQ_IN_FLIGHT = 1, 113 MQ_RQ_COMPLETE = 2, 114 }; 115 116 /* 117 * Try to put the fields that are referenced together in the same cacheline. 118 * 119 * If you modify this structure, make sure to update blk_rq_init() and 120 * especially blk_mq_rq_ctx_init() to take care of the added fields. 121 */ 122 struct request { 123 struct request_queue *q; 124 struct blk_mq_ctx *mq_ctx; 125 struct blk_mq_hw_ctx *mq_hctx; 126 127 unsigned int cmd_flags; /* op and common flags */ 128 req_flags_t rq_flags; 129 130 int tag; 131 int internal_tag; 132 133 /* the following two fields are internal, NEVER access directly */ 134 unsigned int __data_len; /* total data len */ 135 sector_t __sector; /* sector cursor */ 136 137 struct bio *bio; 138 struct bio *biotail; 139 140 struct list_head queuelist; 141 142 /* 143 * The hash is used inside the scheduler, and killed once the 144 * request reaches the dispatch list. The ipi_list is only used 145 * to queue the request for softirq completion, which is long 146 * after the request has been unhashed (and even removed from 147 * the dispatch list). 148 */ 149 union { 150 struct hlist_node hash; /* merge hash */ 151 struct llist_node ipi_list; 152 }; 153 154 /* 155 * The rb_node is only used inside the io scheduler, requests 156 * are pruned when moved to the dispatch queue. So let the 157 * completion_data share space with the rb_node. 158 */ 159 union { 160 struct rb_node rb_node; /* sort/lookup */ 161 struct bio_vec special_vec; 162 void *completion_data; 163 int error_count; /* for legacy drivers, don't use */ 164 }; 165 166 /* 167 * Three pointers are available for the IO schedulers, if they need 168 * more they have to dynamically allocate it. Flush requests are 169 * never put on the IO scheduler. So let the flush fields share 170 * space with the elevator data. 171 */ 172 union { 173 struct { 174 struct io_cq *icq; 175 void *priv[2]; 176 } elv; 177 178 struct { 179 unsigned int seq; 180 struct list_head list; 181 rq_end_io_fn *saved_end_io; 182 } flush; 183 }; 184 185 struct gendisk *rq_disk; 186 struct block_device *part; 187 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 188 /* Time that the first bio started allocating this request. */ 189 u64 alloc_time_ns; 190 #endif 191 /* Time that this request was allocated for this IO. */ 192 u64 start_time_ns; 193 /* Time that I/O was submitted to the device. */ 194 u64 io_start_time_ns; 195 196 #ifdef CONFIG_BLK_WBT 197 unsigned short wbt_flags; 198 #endif 199 /* 200 * rq sectors used for blk stats. It has the same value 201 * with blk_rq_sectors(rq), except that it never be zeroed 202 * by completion. 203 */ 204 unsigned short stats_sectors; 205 206 /* 207 * Number of scatter-gather DMA addr+len pairs after 208 * physical address coalescing is performed. 209 */ 210 unsigned short nr_phys_segments; 211 212 #if defined(CONFIG_BLK_DEV_INTEGRITY) 213 unsigned short nr_integrity_segments; 214 #endif 215 216 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 217 struct bio_crypt_ctx *crypt_ctx; 218 struct blk_ksm_keyslot *crypt_keyslot; 219 #endif 220 221 unsigned short write_hint; 222 unsigned short ioprio; 223 224 enum mq_rq_state state; 225 refcount_t ref; 226 227 unsigned int timeout; 228 unsigned long deadline; 229 230 union { 231 struct __call_single_data csd; 232 u64 fifo_time; 233 }; 234 235 /* 236 * completion callback. 237 */ 238 rq_end_io_fn *end_io; 239 void *end_io_data; 240 }; 241 242 static inline bool blk_op_is_scsi(unsigned int op) 243 { 244 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 245 } 246 247 static inline bool blk_op_is_private(unsigned int op) 248 { 249 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 250 } 251 252 static inline bool blk_rq_is_scsi(struct request *rq) 253 { 254 return blk_op_is_scsi(req_op(rq)); 255 } 256 257 static inline bool blk_rq_is_private(struct request *rq) 258 { 259 return blk_op_is_private(req_op(rq)); 260 } 261 262 static inline bool blk_rq_is_passthrough(struct request *rq) 263 { 264 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 265 } 266 267 static inline bool bio_is_passthrough(struct bio *bio) 268 { 269 unsigned op = bio_op(bio); 270 271 return blk_op_is_scsi(op) || blk_op_is_private(op); 272 } 273 274 static inline bool blk_op_is_passthrough(unsigned int op) 275 { 276 return (blk_op_is_scsi(op & REQ_OP_MASK) || 277 blk_op_is_private(op & REQ_OP_MASK)); 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 /* 320 * BLK_BOUNCE_NONE: never bounce (default) 321 * BLK_BOUNCE_HIGH: bounce all highmem pages 322 */ 323 enum blk_bounce { 324 BLK_BOUNCE_NONE, 325 BLK_BOUNCE_HIGH, 326 }; 327 328 struct queue_limits { 329 enum blk_bounce bounce; 330 unsigned long seg_boundary_mask; 331 unsigned long virt_boundary_mask; 332 333 unsigned int max_hw_sectors; 334 unsigned int max_dev_sectors; 335 unsigned int chunk_sectors; 336 unsigned int max_sectors; 337 unsigned int max_segment_size; 338 unsigned int physical_block_size; 339 unsigned int logical_block_size; 340 unsigned int alignment_offset; 341 unsigned int io_min; 342 unsigned int io_opt; 343 unsigned int max_discard_sectors; 344 unsigned int max_hw_discard_sectors; 345 unsigned int max_write_same_sectors; 346 unsigned int max_write_zeroes_sectors; 347 unsigned int max_zone_append_sectors; 348 unsigned int discard_granularity; 349 unsigned int discard_alignment; 350 unsigned int zone_write_granularity; 351 352 unsigned short max_segments; 353 unsigned short max_integrity_segments; 354 unsigned short max_discard_segments; 355 356 unsigned char misaligned; 357 unsigned char discard_misaligned; 358 unsigned char raid_partial_stripes_expensive; 359 enum blk_zoned_model zoned; 360 }; 361 362 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 363 void *data); 364 365 void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); 366 367 #ifdef CONFIG_BLK_DEV_ZONED 368 369 #define BLK_ALL_ZONES ((unsigned int)-1) 370 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 371 unsigned int nr_zones, report_zones_cb cb, void *data); 372 unsigned int blkdev_nr_zones(struct gendisk *disk); 373 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, 374 sector_t sectors, sector_t nr_sectors, 375 gfp_t gfp_mask); 376 int blk_revalidate_disk_zones(struct gendisk *disk, 377 void (*update_driver_data)(struct gendisk *disk)); 378 379 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 380 unsigned int cmd, unsigned long arg); 381 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, 382 unsigned int cmd, unsigned long arg); 383 384 #else /* CONFIG_BLK_DEV_ZONED */ 385 386 static inline unsigned int blkdev_nr_zones(struct gendisk *disk) 387 { 388 return 0; 389 } 390 391 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 392 fmode_t mode, unsigned int cmd, 393 unsigned long arg) 394 { 395 return -ENOTTY; 396 } 397 398 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 399 fmode_t mode, unsigned int cmd, 400 unsigned long arg) 401 { 402 return -ENOTTY; 403 } 404 405 #endif /* CONFIG_BLK_DEV_ZONED */ 406 407 struct request_queue { 408 struct request *last_merge; 409 struct elevator_queue *elevator; 410 411 struct percpu_ref q_usage_counter; 412 413 struct blk_queue_stats *stats; 414 struct rq_qos *rq_qos; 415 416 const struct blk_mq_ops *mq_ops; 417 418 /* sw queues */ 419 struct blk_mq_ctx __percpu *queue_ctx; 420 421 unsigned int queue_depth; 422 423 /* hw dispatch queues */ 424 struct blk_mq_hw_ctx **queue_hw_ctx; 425 unsigned int nr_hw_queues; 426 427 struct backing_dev_info *backing_dev_info; 428 429 /* 430 * The queue owner gets to use this for whatever they like. 431 * ll_rw_blk doesn't touch it. 432 */ 433 void *queuedata; 434 435 /* 436 * various queue flags, see QUEUE_* below 437 */ 438 unsigned long queue_flags; 439 /* 440 * Number of contexts that have called blk_set_pm_only(). If this 441 * counter is above zero then only RQF_PM requests are processed. 442 */ 443 atomic_t pm_only; 444 445 /* 446 * ida allocated id for this queue. Used to index queues from 447 * ioctx. 448 */ 449 int id; 450 451 spinlock_t queue_lock; 452 453 /* 454 * queue kobject 455 */ 456 struct kobject kobj; 457 458 /* 459 * mq queue kobject 460 */ 461 struct kobject *mq_kobj; 462 463 #ifdef CONFIG_BLK_DEV_INTEGRITY 464 struct blk_integrity integrity; 465 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 466 467 #ifdef CONFIG_PM 468 struct device *dev; 469 enum rpm_status rpm_status; 470 #endif 471 472 /* 473 * queue settings 474 */ 475 unsigned long nr_requests; /* Max # of requests */ 476 477 unsigned int dma_pad_mask; 478 unsigned int dma_alignment; 479 480 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 481 /* Inline crypto capabilities */ 482 struct blk_keyslot_manager *ksm; 483 #endif 484 485 unsigned int rq_timeout; 486 int poll_nsec; 487 488 struct blk_stat_callback *poll_cb; 489 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; 490 491 struct timer_list timeout; 492 struct work_struct timeout_work; 493 494 atomic_t nr_active_requests_shared_sbitmap; 495 496 struct list_head icq_list; 497 #ifdef CONFIG_BLK_CGROUP 498 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 499 struct blkcg_gq *root_blkg; 500 struct list_head blkg_list; 501 #endif 502 503 struct queue_limits limits; 504 505 unsigned int required_elevator_features; 506 507 #ifdef CONFIG_BLK_DEV_ZONED 508 /* 509 * Zoned block device information for request dispatch control. 510 * nr_zones is the total number of zones of the device. This is always 511 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 512 * bits which indicates if a zone is conventional (bit set) or 513 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 514 * bits which indicates if a zone is write locked, that is, if a write 515 * request targeting the zone was dispatched. All three fields are 516 * initialized by the low level device driver (e.g. scsi/sd.c). 517 * Stacking drivers (device mappers) may or may not initialize 518 * these fields. 519 * 520 * Reads of this information must be protected with blk_queue_enter() / 521 * blk_queue_exit(). Modifying this information is only allowed while 522 * no requests are being processed. See also blk_mq_freeze_queue() and 523 * blk_mq_unfreeze_queue(). 524 */ 525 unsigned int nr_zones; 526 unsigned long *conv_zones_bitmap; 527 unsigned long *seq_zones_wlock; 528 unsigned int max_open_zones; 529 unsigned int max_active_zones; 530 #endif /* CONFIG_BLK_DEV_ZONED */ 531 532 /* 533 * sg stuff 534 */ 535 unsigned int sg_timeout; 536 unsigned int sg_reserved_size; 537 int node; 538 struct mutex debugfs_mutex; 539 #ifdef CONFIG_BLK_DEV_IO_TRACE 540 struct blk_trace __rcu *blk_trace; 541 #endif 542 /* 543 * for flush operations 544 */ 545 struct blk_flush_queue *fq; 546 547 struct list_head requeue_list; 548 spinlock_t requeue_lock; 549 struct delayed_work requeue_work; 550 551 struct mutex sysfs_lock; 552 struct mutex sysfs_dir_lock; 553 554 /* 555 * for reusing dead hctx instance in case of updating 556 * nr_hw_queues 557 */ 558 struct list_head unused_hctx_list; 559 spinlock_t unused_hctx_lock; 560 561 int mq_freeze_depth; 562 563 #if defined(CONFIG_BLK_DEV_BSG) 564 struct bsg_class_device bsg_dev; 565 #endif 566 567 #ifdef CONFIG_BLK_DEV_THROTTLING 568 /* Throttle data */ 569 struct throtl_data *td; 570 #endif 571 struct rcu_head rcu_head; 572 wait_queue_head_t mq_freeze_wq; 573 /* 574 * Protect concurrent access to q_usage_counter by 575 * percpu_ref_kill() and percpu_ref_reinit(). 576 */ 577 struct mutex mq_freeze_lock; 578 579 struct blk_mq_tag_set *tag_set; 580 struct list_head tag_set_list; 581 struct bio_set bio_split; 582 583 struct dentry *debugfs_dir; 584 585 #ifdef CONFIG_BLK_DEBUG_FS 586 struct dentry *sched_debugfs_dir; 587 struct dentry *rqos_debugfs_dir; 588 #endif 589 590 bool mq_sysfs_init_done; 591 592 size_t cmd_size; 593 594 #define BLK_MAX_WRITE_HINTS 5 595 u64 write_hints[BLK_MAX_WRITE_HINTS]; 596 }; 597 598 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 599 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 600 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 601 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 602 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 603 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 604 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 605 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 606 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 607 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ 608 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 609 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 610 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ 611 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 612 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 613 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 614 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 615 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 616 #define QUEUE_FLAG_WC 17 /* Write back caching */ 617 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 618 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 619 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 620 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ 621 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 622 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ 623 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 624 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 625 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 626 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 627 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 628 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 629 630 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 631 (1 << QUEUE_FLAG_SAME_COMP) | \ 632 (1 << QUEUE_FLAG_NOWAIT)) 633 634 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 635 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 636 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 637 638 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 639 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 640 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 641 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 642 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 643 #define blk_queue_noxmerges(q) \ 644 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 645 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 646 #define blk_queue_stable_writes(q) \ 647 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 648 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 649 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 650 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 651 #define blk_queue_zone_resetall(q) \ 652 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 653 #define blk_queue_secure_erase(q) \ 654 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 655 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 656 #define blk_queue_scsi_passthrough(q) \ 657 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 658 #define blk_queue_pci_p2pdma(q) \ 659 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 660 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 661 #define blk_queue_rq_alloc_time(q) \ 662 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 663 #else 664 #define blk_queue_rq_alloc_time(q) false 665 #endif 666 667 #define blk_noretry_request(rq) \ 668 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 669 REQ_FAILFAST_DRIVER)) 670 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 671 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 672 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 673 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 674 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) 675 676 extern void blk_set_pm_only(struct request_queue *q); 677 extern void blk_clear_pm_only(struct request_queue *q); 678 679 static inline bool blk_account_rq(struct request *rq) 680 { 681 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 682 } 683 684 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 685 686 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 687 688 #define rq_dma_dir(rq) \ 689 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 690 691 #define dma_map_bvec(dev, bv, dir, attrs) \ 692 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 693 (dir), (attrs)) 694 695 #define queue_to_disk(q) (dev_to_disk(kobj_to_dev((q)->kobj.parent))) 696 697 static inline bool queue_is_mq(struct request_queue *q) 698 { 699 return q->mq_ops; 700 } 701 702 #ifdef CONFIG_PM 703 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 704 { 705 return q->rpm_status; 706 } 707 #else 708 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 709 { 710 return RPM_ACTIVE; 711 } 712 #endif 713 714 static inline enum blk_zoned_model 715 blk_queue_zoned_model(struct request_queue *q) 716 { 717 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) 718 return q->limits.zoned; 719 return BLK_ZONED_NONE; 720 } 721 722 static inline bool blk_queue_is_zoned(struct request_queue *q) 723 { 724 switch (blk_queue_zoned_model(q)) { 725 case BLK_ZONED_HA: 726 case BLK_ZONED_HM: 727 return true; 728 default: 729 return false; 730 } 731 } 732 733 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 734 { 735 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 736 } 737 738 #ifdef CONFIG_BLK_DEV_ZONED 739 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 740 { 741 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 742 } 743 744 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 745 sector_t sector) 746 { 747 if (!blk_queue_is_zoned(q)) 748 return 0; 749 return sector >> ilog2(q->limits.chunk_sectors); 750 } 751 752 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 753 sector_t sector) 754 { 755 if (!blk_queue_is_zoned(q)) 756 return false; 757 if (!q->conv_zones_bitmap) 758 return true; 759 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 760 } 761 762 static inline void blk_queue_max_open_zones(struct request_queue *q, 763 unsigned int max_open_zones) 764 { 765 q->max_open_zones = max_open_zones; 766 } 767 768 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 769 { 770 return q->max_open_zones; 771 } 772 773 static inline void blk_queue_max_active_zones(struct request_queue *q, 774 unsigned int max_active_zones) 775 { 776 q->max_active_zones = max_active_zones; 777 } 778 779 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 780 { 781 return q->max_active_zones; 782 } 783 #else /* CONFIG_BLK_DEV_ZONED */ 784 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 785 { 786 return 0; 787 } 788 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 789 sector_t sector) 790 { 791 return false; 792 } 793 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 794 sector_t sector) 795 { 796 return 0; 797 } 798 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 799 { 800 return 0; 801 } 802 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 803 { 804 return 0; 805 } 806 #endif /* CONFIG_BLK_DEV_ZONED */ 807 808 static inline bool rq_is_sync(struct request *rq) 809 { 810 return op_is_sync(rq->cmd_flags); 811 } 812 813 static inline bool rq_mergeable(struct request *rq) 814 { 815 if (blk_rq_is_passthrough(rq)) 816 return false; 817 818 if (req_op(rq) == REQ_OP_FLUSH) 819 return false; 820 821 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 822 return false; 823 824 if (req_op(rq) == REQ_OP_ZONE_APPEND) 825 return false; 826 827 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 828 return false; 829 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 830 return false; 831 832 return true; 833 } 834 835 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 836 { 837 if (bio_page(a) == bio_page(b) && 838 bio_offset(a) == bio_offset(b)) 839 return true; 840 841 return false; 842 } 843 844 static inline unsigned int blk_queue_depth(struct request_queue *q) 845 { 846 if (q->queue_depth) 847 return q->queue_depth; 848 849 return q->nr_requests; 850 } 851 852 /* 853 * default timeout for SG_IO if none specified 854 */ 855 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 856 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 857 858 struct rq_map_data { 859 struct page **pages; 860 int page_order; 861 int nr_entries; 862 unsigned long offset; 863 int null_mapped; 864 int from_user; 865 }; 866 867 struct req_iterator { 868 struct bvec_iter iter; 869 struct bio *bio; 870 }; 871 872 /* This should not be used directly - use rq_for_each_segment */ 873 #define for_each_bio(_bio) \ 874 for (; _bio; _bio = _bio->bi_next) 875 #define __rq_for_each_bio(_bio, rq) \ 876 if ((rq->bio)) \ 877 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 878 879 #define rq_for_each_segment(bvl, _rq, _iter) \ 880 __rq_for_each_bio(_iter.bio, _rq) \ 881 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 882 883 #define rq_for_each_bvec(bvl, _rq, _iter) \ 884 __rq_for_each_bio(_iter.bio, _rq) \ 885 bio_for_each_bvec(bvl, _iter.bio, _iter.iter) 886 887 #define rq_iter_last(bvec, _iter) \ 888 (_iter.bio->bi_next == NULL && \ 889 bio_iter_last(bvec, _iter.iter)) 890 891 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 892 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 893 #endif 894 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 895 extern void rq_flush_dcache_pages(struct request *rq); 896 #else 897 static inline void rq_flush_dcache_pages(struct request *rq) 898 { 899 } 900 #endif 901 902 extern int blk_register_queue(struct gendisk *disk); 903 extern void blk_unregister_queue(struct gendisk *disk); 904 blk_qc_t submit_bio_noacct(struct bio *bio); 905 extern void blk_rq_init(struct request_queue *q, struct request *rq); 906 extern void blk_put_request(struct request *); 907 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 908 blk_mq_req_flags_t flags); 909 extern int blk_lld_busy(struct request_queue *q); 910 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 911 struct bio_set *bs, gfp_t gfp_mask, 912 int (*bio_ctr)(struct bio *, struct bio *, void *), 913 void *data); 914 extern void blk_rq_unprep_clone(struct request *rq); 915 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 916 struct request *rq); 917 int blk_rq_append_bio(struct request *rq, struct bio *bio); 918 extern void blk_queue_split(struct bio **); 919 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 920 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 921 unsigned int, void __user *); 922 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 923 unsigned int, void __user *); 924 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 925 struct scsi_ioctl_command __user *); 926 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); 927 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); 928 929 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 930 extern void blk_queue_exit(struct request_queue *q); 931 extern void blk_sync_queue(struct request_queue *q); 932 extern int blk_rq_map_user(struct request_queue *, struct request *, 933 struct rq_map_data *, void __user *, unsigned long, 934 gfp_t); 935 extern int blk_rq_unmap_user(struct bio *); 936 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 937 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 938 struct rq_map_data *, const struct iov_iter *, 939 gfp_t); 940 extern void blk_execute_rq(struct gendisk *, struct request *, int); 941 extern void blk_execute_rq_nowait(struct gendisk *, 942 struct request *, int, rq_end_io_fn *); 943 944 /* Helper to convert REQ_OP_XXX to its string format XXX */ 945 extern const char *blk_op_str(unsigned int op); 946 947 int blk_status_to_errno(blk_status_t status); 948 blk_status_t errno_to_blk_status(int errno); 949 950 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); 951 952 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 953 { 954 return bdev->bd_disk->queue; /* this is never NULL */ 955 } 956 957 /* 958 * The basic unit of block I/O is a sector. It is used in a number of contexts 959 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 960 * bytes. Variables of type sector_t represent an offset or size that is a 961 * multiple of 512 bytes. Hence these two constants. 962 */ 963 #ifndef SECTOR_SHIFT 964 #define SECTOR_SHIFT 9 965 #endif 966 #ifndef SECTOR_SIZE 967 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 968 #endif 969 970 /* 971 * blk_rq_pos() : the current sector 972 * blk_rq_bytes() : bytes left in the entire request 973 * blk_rq_cur_bytes() : bytes left in the current segment 974 * blk_rq_err_bytes() : bytes left till the next error boundary 975 * blk_rq_sectors() : sectors left in the entire request 976 * blk_rq_cur_sectors() : sectors left in the current segment 977 * blk_rq_stats_sectors() : sectors of the entire request used for stats 978 */ 979 static inline sector_t blk_rq_pos(const struct request *rq) 980 { 981 return rq->__sector; 982 } 983 984 static inline unsigned int blk_rq_bytes(const struct request *rq) 985 { 986 return rq->__data_len; 987 } 988 989 static inline int blk_rq_cur_bytes(const struct request *rq) 990 { 991 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 992 } 993 994 extern unsigned int blk_rq_err_bytes(const struct request *rq); 995 996 static inline unsigned int blk_rq_sectors(const struct request *rq) 997 { 998 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 999 } 1000 1001 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 1002 { 1003 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 1004 } 1005 1006 static inline unsigned int blk_rq_stats_sectors(const struct request *rq) 1007 { 1008 return rq->stats_sectors; 1009 } 1010 1011 #ifdef CONFIG_BLK_DEV_ZONED 1012 1013 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 1014 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 1015 1016 static inline unsigned int blk_rq_zone_no(struct request *rq) 1017 { 1018 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1019 } 1020 1021 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1022 { 1023 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1024 } 1025 #endif /* CONFIG_BLK_DEV_ZONED */ 1026 1027 /* 1028 * Some commands like WRITE SAME have a payload or data transfer size which 1029 * is different from the size of the request. Any driver that supports such 1030 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1031 * calculate the data transfer size. 1032 */ 1033 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1034 { 1035 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1036 return rq->special_vec.bv_len; 1037 return blk_rq_bytes(rq); 1038 } 1039 1040 /* 1041 * Return the first full biovec in the request. The caller needs to check that 1042 * there are any bvecs before calling this helper. 1043 */ 1044 static inline struct bio_vec req_bvec(struct request *rq) 1045 { 1046 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1047 return rq->special_vec; 1048 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); 1049 } 1050 1051 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1052 int op) 1053 { 1054 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1055 return min(q->limits.max_discard_sectors, 1056 UINT_MAX >> SECTOR_SHIFT); 1057 1058 if (unlikely(op == REQ_OP_WRITE_SAME)) 1059 return q->limits.max_write_same_sectors; 1060 1061 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1062 return q->limits.max_write_zeroes_sectors; 1063 1064 return q->limits.max_sectors; 1065 } 1066 1067 /* 1068 * Return maximum size of a request at given offset. Only valid for 1069 * file system requests. 1070 */ 1071 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1072 sector_t offset, 1073 unsigned int chunk_sectors) 1074 { 1075 if (!chunk_sectors) { 1076 if (q->limits.chunk_sectors) 1077 chunk_sectors = q->limits.chunk_sectors; 1078 else 1079 return q->limits.max_sectors; 1080 } 1081 1082 if (likely(is_power_of_2(chunk_sectors))) 1083 chunk_sectors -= offset & (chunk_sectors - 1); 1084 else 1085 chunk_sectors -= sector_div(offset, chunk_sectors); 1086 1087 return min(q->limits.max_sectors, chunk_sectors); 1088 } 1089 1090 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1091 sector_t offset) 1092 { 1093 struct request_queue *q = rq->q; 1094 1095 if (blk_rq_is_passthrough(rq)) 1096 return q->limits.max_hw_sectors; 1097 1098 if (!q->limits.chunk_sectors || 1099 req_op(rq) == REQ_OP_DISCARD || 1100 req_op(rq) == REQ_OP_SECURE_ERASE) 1101 return blk_queue_get_max_sectors(q, req_op(rq)); 1102 1103 return min(blk_max_size_offset(q, offset, 0), 1104 blk_queue_get_max_sectors(q, req_op(rq))); 1105 } 1106 1107 static inline unsigned int blk_rq_count_bios(struct request *rq) 1108 { 1109 unsigned int nr_bios = 0; 1110 struct bio *bio; 1111 1112 __rq_for_each_bio(bio, rq) 1113 nr_bios++; 1114 1115 return nr_bios; 1116 } 1117 1118 void blk_steal_bios(struct bio_list *list, struct request *rq); 1119 1120 /* 1121 * Request completion related functions. 1122 * 1123 * blk_update_request() completes given number of bytes and updates 1124 * the request without completing it. 1125 */ 1126 extern bool blk_update_request(struct request *rq, blk_status_t error, 1127 unsigned int nr_bytes); 1128 1129 extern void blk_abort_request(struct request *); 1130 1131 /* 1132 * Access functions for manipulating queue properties 1133 */ 1134 extern void blk_cleanup_queue(struct request_queue *); 1135 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit); 1136 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1137 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1138 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1139 extern void blk_queue_max_discard_segments(struct request_queue *, 1140 unsigned short); 1141 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1142 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1143 unsigned int max_discard_sectors); 1144 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1145 unsigned int max_write_same_sectors); 1146 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1147 unsigned int max_write_same_sectors); 1148 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 1149 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 1150 unsigned int max_zone_append_sectors); 1151 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1152 void blk_queue_zone_write_granularity(struct request_queue *q, 1153 unsigned int size); 1154 extern void blk_queue_alignment_offset(struct request_queue *q, 1155 unsigned int alignment); 1156 void blk_queue_update_readahead(struct request_queue *q); 1157 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1158 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1159 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1160 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1161 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1162 extern void blk_set_default_limits(struct queue_limits *lim); 1163 extern void blk_set_stacking_limits(struct queue_limits *lim); 1164 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1165 sector_t offset); 1166 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1167 sector_t offset); 1168 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1169 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1170 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1171 extern void blk_queue_dma_alignment(struct request_queue *, int); 1172 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1173 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1174 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1175 extern void blk_queue_required_elevator_features(struct request_queue *q, 1176 unsigned int features); 1177 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1178 struct device *dev); 1179 1180 /* 1181 * Number of physical segments as sent to the device. 1182 * 1183 * Normally this is the number of discontiguous data segments sent by the 1184 * submitter. But for data-less command like discard we might have no 1185 * actual data segments submitted, but the driver might have to add it's 1186 * own special payload. In that case we still return 1 here so that this 1187 * special payload will be mapped. 1188 */ 1189 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1190 { 1191 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1192 return 1; 1193 return rq->nr_phys_segments; 1194 } 1195 1196 /* 1197 * Number of discard segments (or ranges) the driver needs to fill in. 1198 * Each discard bio merged into a request is counted as one segment. 1199 */ 1200 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1201 { 1202 return max_t(unsigned short, rq->nr_phys_segments, 1); 1203 } 1204 1205 int __blk_rq_map_sg(struct request_queue *q, struct request *rq, 1206 struct scatterlist *sglist, struct scatterlist **last_sg); 1207 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, 1208 struct scatterlist *sglist) 1209 { 1210 struct scatterlist *last_sg = NULL; 1211 1212 return __blk_rq_map_sg(q, rq, sglist, &last_sg); 1213 } 1214 extern void blk_dump_rq_flags(struct request *, char *); 1215 1216 bool __must_check blk_get_queue(struct request_queue *); 1217 struct request_queue *blk_alloc_queue(int node_id); 1218 extern void blk_put_queue(struct request_queue *); 1219 extern void blk_set_queue_dying(struct request_queue *); 1220 1221 #ifdef CONFIG_BLOCK 1222 /* 1223 * blk_plug permits building a queue of related requests by holding the I/O 1224 * fragments for a short period. This allows merging of sequential requests 1225 * into single larger request. As the requests are moved from a per-task list to 1226 * the device's request_queue in a batch, this results in improved scalability 1227 * as the lock contention for request_queue lock is reduced. 1228 * 1229 * It is ok not to disable preemption when adding the request to the plug list 1230 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1231 * the plug list when the task sleeps by itself. For details, please see 1232 * schedule() where blk_schedule_flush_plug() is called. 1233 */ 1234 struct blk_plug { 1235 struct list_head mq_list; /* blk-mq requests */ 1236 struct list_head cb_list; /* md requires an unplug callback */ 1237 unsigned short rq_count; 1238 bool multiple_queues; 1239 bool nowait; 1240 }; 1241 #define BLK_MAX_REQUEST_COUNT 16 1242 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1243 1244 struct blk_plug_cb; 1245 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1246 struct blk_plug_cb { 1247 struct list_head list; 1248 blk_plug_cb_fn callback; 1249 void *data; 1250 }; 1251 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1252 void *data, int size); 1253 extern void blk_start_plug(struct blk_plug *); 1254 extern void blk_finish_plug(struct blk_plug *); 1255 extern void blk_flush_plug_list(struct blk_plug *, bool); 1256 1257 static inline void blk_flush_plug(struct task_struct *tsk) 1258 { 1259 struct blk_plug *plug = tsk->plug; 1260 1261 if (plug) 1262 blk_flush_plug_list(plug, false); 1263 } 1264 1265 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1266 { 1267 struct blk_plug *plug = tsk->plug; 1268 1269 if (plug) 1270 blk_flush_plug_list(plug, true); 1271 } 1272 1273 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1274 { 1275 struct blk_plug *plug = tsk->plug; 1276 1277 return plug && 1278 (!list_empty(&plug->mq_list) || 1279 !list_empty(&plug->cb_list)); 1280 } 1281 1282 int blkdev_issue_flush(struct block_device *bdev); 1283 long nr_blockdev_pages(void); 1284 #else /* CONFIG_BLOCK */ 1285 struct blk_plug { 1286 }; 1287 1288 static inline void blk_start_plug(struct blk_plug *plug) 1289 { 1290 } 1291 1292 static inline void blk_finish_plug(struct blk_plug *plug) 1293 { 1294 } 1295 1296 static inline void blk_flush_plug(struct task_struct *task) 1297 { 1298 } 1299 1300 static inline void blk_schedule_flush_plug(struct task_struct *task) 1301 { 1302 } 1303 1304 1305 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1306 { 1307 return false; 1308 } 1309 1310 static inline int blkdev_issue_flush(struct block_device *bdev) 1311 { 1312 return 0; 1313 } 1314 1315 static inline long nr_blockdev_pages(void) 1316 { 1317 return 0; 1318 } 1319 #endif /* CONFIG_BLOCK */ 1320 1321 extern void blk_io_schedule(void); 1322 1323 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1324 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1325 1326 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1327 1328 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1329 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1330 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1331 sector_t nr_sects, gfp_t gfp_mask, int flags, 1332 struct bio **biop); 1333 1334 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1335 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1336 1337 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1338 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1339 unsigned flags); 1340 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1341 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1342 1343 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1344 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1345 { 1346 return blkdev_issue_discard(sb->s_bdev, 1347 block << (sb->s_blocksize_bits - 1348 SECTOR_SHIFT), 1349 nr_blocks << (sb->s_blocksize_bits - 1350 SECTOR_SHIFT), 1351 gfp_mask, flags); 1352 } 1353 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1354 sector_t nr_blocks, gfp_t gfp_mask) 1355 { 1356 return blkdev_issue_zeroout(sb->s_bdev, 1357 block << (sb->s_blocksize_bits - 1358 SECTOR_SHIFT), 1359 nr_blocks << (sb->s_blocksize_bits - 1360 SECTOR_SHIFT), 1361 gfp_mask, 0); 1362 } 1363 1364 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1365 1366 static inline bool bdev_is_partition(struct block_device *bdev) 1367 { 1368 return bdev->bd_partno; 1369 } 1370 1371 enum blk_default_limits { 1372 BLK_MAX_SEGMENTS = 128, 1373 BLK_SAFE_MAX_SECTORS = 255, 1374 BLK_DEF_MAX_SECTORS = 2560, 1375 BLK_MAX_SEGMENT_SIZE = 65536, 1376 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1377 }; 1378 1379 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1380 { 1381 return q->limits.seg_boundary_mask; 1382 } 1383 1384 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1385 { 1386 return q->limits.virt_boundary_mask; 1387 } 1388 1389 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1390 { 1391 return q->limits.max_sectors; 1392 } 1393 1394 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1395 { 1396 return q->limits.max_hw_sectors; 1397 } 1398 1399 static inline unsigned short queue_max_segments(const struct request_queue *q) 1400 { 1401 return q->limits.max_segments; 1402 } 1403 1404 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1405 { 1406 return q->limits.max_discard_segments; 1407 } 1408 1409 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1410 { 1411 return q->limits.max_segment_size; 1412 } 1413 1414 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1415 { 1416 1417 const struct queue_limits *l = &q->limits; 1418 1419 return min(l->max_zone_append_sectors, l->max_sectors); 1420 } 1421 1422 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1423 { 1424 int retval = 512; 1425 1426 if (q && q->limits.logical_block_size) 1427 retval = q->limits.logical_block_size; 1428 1429 return retval; 1430 } 1431 1432 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1433 { 1434 return queue_logical_block_size(bdev_get_queue(bdev)); 1435 } 1436 1437 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1438 { 1439 return q->limits.physical_block_size; 1440 } 1441 1442 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1443 { 1444 return queue_physical_block_size(bdev_get_queue(bdev)); 1445 } 1446 1447 static inline unsigned int queue_io_min(const struct request_queue *q) 1448 { 1449 return q->limits.io_min; 1450 } 1451 1452 static inline int bdev_io_min(struct block_device *bdev) 1453 { 1454 return queue_io_min(bdev_get_queue(bdev)); 1455 } 1456 1457 static inline unsigned int queue_io_opt(const struct request_queue *q) 1458 { 1459 return q->limits.io_opt; 1460 } 1461 1462 static inline int bdev_io_opt(struct block_device *bdev) 1463 { 1464 return queue_io_opt(bdev_get_queue(bdev)); 1465 } 1466 1467 static inline unsigned int 1468 queue_zone_write_granularity(const struct request_queue *q) 1469 { 1470 return q->limits.zone_write_granularity; 1471 } 1472 1473 static inline unsigned int 1474 bdev_zone_write_granularity(struct block_device *bdev) 1475 { 1476 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1477 } 1478 1479 static inline int queue_alignment_offset(const struct request_queue *q) 1480 { 1481 if (q->limits.misaligned) 1482 return -1; 1483 1484 return q->limits.alignment_offset; 1485 } 1486 1487 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1488 { 1489 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1490 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1491 << SECTOR_SHIFT; 1492 1493 return (granularity + lim->alignment_offset - alignment) % granularity; 1494 } 1495 1496 static inline int bdev_alignment_offset(struct block_device *bdev) 1497 { 1498 struct request_queue *q = bdev_get_queue(bdev); 1499 1500 if (q->limits.misaligned) 1501 return -1; 1502 if (bdev_is_partition(bdev)) 1503 return queue_limit_alignment_offset(&q->limits, 1504 bdev->bd_start_sect); 1505 return q->limits.alignment_offset; 1506 } 1507 1508 static inline int queue_discard_alignment(const struct request_queue *q) 1509 { 1510 if (q->limits.discard_misaligned) 1511 return -1; 1512 1513 return q->limits.discard_alignment; 1514 } 1515 1516 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1517 { 1518 unsigned int alignment, granularity, offset; 1519 1520 if (!lim->max_discard_sectors) 1521 return 0; 1522 1523 /* Why are these in bytes, not sectors? */ 1524 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1525 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1526 if (!granularity) 1527 return 0; 1528 1529 /* Offset of the partition start in 'granularity' sectors */ 1530 offset = sector_div(sector, granularity); 1531 1532 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1533 offset = (granularity + alignment - offset) % granularity; 1534 1535 /* Turn it back into bytes, gaah */ 1536 return offset << SECTOR_SHIFT; 1537 } 1538 1539 static inline int bdev_discard_alignment(struct block_device *bdev) 1540 { 1541 struct request_queue *q = bdev_get_queue(bdev); 1542 1543 if (bdev_is_partition(bdev)) 1544 return queue_limit_discard_alignment(&q->limits, 1545 bdev->bd_start_sect); 1546 return q->limits.discard_alignment; 1547 } 1548 1549 static inline unsigned int bdev_write_same(struct block_device *bdev) 1550 { 1551 struct request_queue *q = bdev_get_queue(bdev); 1552 1553 if (q) 1554 return q->limits.max_write_same_sectors; 1555 1556 return 0; 1557 } 1558 1559 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1560 { 1561 struct request_queue *q = bdev_get_queue(bdev); 1562 1563 if (q) 1564 return q->limits.max_write_zeroes_sectors; 1565 1566 return 0; 1567 } 1568 1569 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1570 { 1571 struct request_queue *q = bdev_get_queue(bdev); 1572 1573 if (q) 1574 return blk_queue_zoned_model(q); 1575 1576 return BLK_ZONED_NONE; 1577 } 1578 1579 static inline bool bdev_is_zoned(struct block_device *bdev) 1580 { 1581 struct request_queue *q = bdev_get_queue(bdev); 1582 1583 if (q) 1584 return blk_queue_is_zoned(q); 1585 1586 return false; 1587 } 1588 1589 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1590 { 1591 struct request_queue *q = bdev_get_queue(bdev); 1592 1593 if (q) 1594 return blk_queue_zone_sectors(q); 1595 return 0; 1596 } 1597 1598 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1599 { 1600 struct request_queue *q = bdev_get_queue(bdev); 1601 1602 if (q) 1603 return queue_max_open_zones(q); 1604 return 0; 1605 } 1606 1607 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1608 { 1609 struct request_queue *q = bdev_get_queue(bdev); 1610 1611 if (q) 1612 return queue_max_active_zones(q); 1613 return 0; 1614 } 1615 1616 static inline int queue_dma_alignment(const struct request_queue *q) 1617 { 1618 return q ? q->dma_alignment : 511; 1619 } 1620 1621 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1622 unsigned int len) 1623 { 1624 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1625 return !(addr & alignment) && !(len & alignment); 1626 } 1627 1628 /* assumes size > 256 */ 1629 static inline unsigned int blksize_bits(unsigned int size) 1630 { 1631 unsigned int bits = 8; 1632 do { 1633 bits++; 1634 size >>= 1; 1635 } while (size > 256); 1636 return bits; 1637 } 1638 1639 static inline unsigned int block_size(struct block_device *bdev) 1640 { 1641 return 1 << bdev->bd_inode->i_blkbits; 1642 } 1643 1644 int kblockd_schedule_work(struct work_struct *work); 1645 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1646 1647 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1648 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1649 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1650 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1651 1652 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1653 1654 enum blk_integrity_flags { 1655 BLK_INTEGRITY_VERIFY = 1 << 0, 1656 BLK_INTEGRITY_GENERATE = 1 << 1, 1657 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1658 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1659 }; 1660 1661 struct blk_integrity_iter { 1662 void *prot_buf; 1663 void *data_buf; 1664 sector_t seed; 1665 unsigned int data_size; 1666 unsigned short interval; 1667 const char *disk_name; 1668 }; 1669 1670 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1671 typedef void (integrity_prepare_fn) (struct request *); 1672 typedef void (integrity_complete_fn) (struct request *, unsigned int); 1673 1674 struct blk_integrity_profile { 1675 integrity_processing_fn *generate_fn; 1676 integrity_processing_fn *verify_fn; 1677 integrity_prepare_fn *prepare_fn; 1678 integrity_complete_fn *complete_fn; 1679 const char *name; 1680 }; 1681 1682 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1683 extern void blk_integrity_unregister(struct gendisk *); 1684 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1685 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1686 struct scatterlist *); 1687 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1688 1689 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1690 { 1691 struct blk_integrity *bi = &disk->queue->integrity; 1692 1693 if (!bi->profile) 1694 return NULL; 1695 1696 return bi; 1697 } 1698 1699 static inline 1700 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1701 { 1702 return blk_get_integrity(bdev->bd_disk); 1703 } 1704 1705 static inline bool 1706 blk_integrity_queue_supports_integrity(struct request_queue *q) 1707 { 1708 return q->integrity.profile; 1709 } 1710 1711 static inline bool blk_integrity_rq(struct request *rq) 1712 { 1713 return rq->cmd_flags & REQ_INTEGRITY; 1714 } 1715 1716 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1717 unsigned int segs) 1718 { 1719 q->limits.max_integrity_segments = segs; 1720 } 1721 1722 static inline unsigned short 1723 queue_max_integrity_segments(const struct request_queue *q) 1724 { 1725 return q->limits.max_integrity_segments; 1726 } 1727 1728 /** 1729 * bio_integrity_intervals - Return number of integrity intervals for a bio 1730 * @bi: blk_integrity profile for device 1731 * @sectors: Size of the bio in 512-byte sectors 1732 * 1733 * Description: The block layer calculates everything in 512 byte 1734 * sectors but integrity metadata is done in terms of the data integrity 1735 * interval size of the storage device. Convert the block layer sectors 1736 * to the appropriate number of integrity intervals. 1737 */ 1738 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1739 unsigned int sectors) 1740 { 1741 return sectors >> (bi->interval_exp - 9); 1742 } 1743 1744 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1745 unsigned int sectors) 1746 { 1747 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1748 } 1749 1750 /* 1751 * Return the first bvec that contains integrity data. Only drivers that are 1752 * limited to a single integrity segment should use this helper. 1753 */ 1754 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1755 { 1756 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) 1757 return NULL; 1758 return rq->bio->bi_integrity->bip_vec; 1759 } 1760 1761 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1762 1763 struct bio; 1764 struct block_device; 1765 struct gendisk; 1766 struct blk_integrity; 1767 1768 static inline int blk_integrity_rq(struct request *rq) 1769 { 1770 return 0; 1771 } 1772 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1773 struct bio *b) 1774 { 1775 return 0; 1776 } 1777 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1778 struct bio *b, 1779 struct scatterlist *s) 1780 { 1781 return 0; 1782 } 1783 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1784 { 1785 return NULL; 1786 } 1787 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1788 { 1789 return NULL; 1790 } 1791 static inline bool 1792 blk_integrity_queue_supports_integrity(struct request_queue *q) 1793 { 1794 return false; 1795 } 1796 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1797 { 1798 return 0; 1799 } 1800 static inline void blk_integrity_register(struct gendisk *d, 1801 struct blk_integrity *b) 1802 { 1803 } 1804 static inline void blk_integrity_unregister(struct gendisk *d) 1805 { 1806 } 1807 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1808 unsigned int segs) 1809 { 1810 } 1811 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) 1812 { 1813 return 0; 1814 } 1815 1816 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1817 unsigned int sectors) 1818 { 1819 return 0; 1820 } 1821 1822 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1823 unsigned int sectors) 1824 { 1825 return 0; 1826 } 1827 1828 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1829 { 1830 return NULL; 1831 } 1832 1833 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1834 1835 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1836 1837 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); 1838 1839 void blk_ksm_unregister(struct request_queue *q); 1840 1841 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1842 1843 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, 1844 struct request_queue *q) 1845 { 1846 return true; 1847 } 1848 1849 static inline void blk_ksm_unregister(struct request_queue *q) { } 1850 1851 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1852 1853 1854 struct block_device_operations { 1855 blk_qc_t (*submit_bio) (struct bio *bio); 1856 int (*open) (struct block_device *, fmode_t); 1857 void (*release) (struct gendisk *, fmode_t); 1858 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1859 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1860 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1861 unsigned int (*check_events) (struct gendisk *disk, 1862 unsigned int clearing); 1863 void (*unlock_native_capacity) (struct gendisk *); 1864 int (*getgeo)(struct block_device *, struct hd_geometry *); 1865 int (*set_read_only)(struct block_device *bdev, bool ro); 1866 /* this callback is with swap_lock and sometimes page table lock held */ 1867 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1868 int (*report_zones)(struct gendisk *, sector_t sector, 1869 unsigned int nr_zones, report_zones_cb cb, void *data); 1870 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1871 struct module *owner; 1872 const struct pr_ops *pr_ops; 1873 }; 1874 1875 #ifdef CONFIG_COMPAT 1876 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1877 unsigned int, unsigned long); 1878 #else 1879 #define blkdev_compat_ptr_ioctl NULL 1880 #endif 1881 1882 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1883 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1884 struct writeback_control *); 1885 1886 #ifdef CONFIG_BLK_DEV_ZONED 1887 bool blk_req_needs_zone_write_lock(struct request *rq); 1888 bool blk_req_zone_write_trylock(struct request *rq); 1889 void __blk_req_zone_write_lock(struct request *rq); 1890 void __blk_req_zone_write_unlock(struct request *rq); 1891 1892 static inline void blk_req_zone_write_lock(struct request *rq) 1893 { 1894 if (blk_req_needs_zone_write_lock(rq)) 1895 __blk_req_zone_write_lock(rq); 1896 } 1897 1898 static inline void blk_req_zone_write_unlock(struct request *rq) 1899 { 1900 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1901 __blk_req_zone_write_unlock(rq); 1902 } 1903 1904 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1905 { 1906 return rq->q->seq_zones_wlock && 1907 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1908 } 1909 1910 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1911 { 1912 if (!blk_req_needs_zone_write_lock(rq)) 1913 return true; 1914 return !blk_req_zone_is_write_locked(rq); 1915 } 1916 #else 1917 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1918 { 1919 return false; 1920 } 1921 1922 static inline void blk_req_zone_write_lock(struct request *rq) 1923 { 1924 } 1925 1926 static inline void blk_req_zone_write_unlock(struct request *rq) 1927 { 1928 } 1929 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1930 { 1931 return false; 1932 } 1933 1934 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1935 { 1936 return true; 1937 } 1938 #endif /* CONFIG_BLK_DEV_ZONED */ 1939 1940 static inline void blk_wake_io_task(struct task_struct *waiter) 1941 { 1942 /* 1943 * If we're polling, the task itself is doing the completions. For 1944 * that case, we don't need to signal a wakeup, it's enough to just 1945 * mark us as RUNNING. 1946 */ 1947 if (waiter == current) 1948 __set_current_state(TASK_RUNNING); 1949 else 1950 wake_up_process(waiter); 1951 } 1952 1953 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1954 unsigned int op); 1955 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1956 unsigned long start_time); 1957 1958 unsigned long bio_start_io_acct(struct bio *bio); 1959 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1960 struct block_device *orig_bdev); 1961 1962 /** 1963 * bio_end_io_acct - end I/O accounting for bio based drivers 1964 * @bio: bio to end account for 1965 * @start: start time returned by bio_start_io_acct() 1966 */ 1967 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1968 { 1969 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1970 } 1971 1972 int bdev_read_only(struct block_device *bdev); 1973 int set_blocksize(struct block_device *bdev, int size); 1974 1975 const char *bdevname(struct block_device *bdev, char *buffer); 1976 int lookup_bdev(const char *pathname, dev_t *dev); 1977 1978 void blkdev_show(struct seq_file *seqf, off_t offset); 1979 1980 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1981 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1982 #ifdef CONFIG_BLOCK 1983 #define BLKDEV_MAJOR_MAX 512 1984 #else 1985 #define BLKDEV_MAJOR_MAX 0 1986 #endif 1987 1988 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 1989 void *holder); 1990 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 1991 int bd_prepare_to_claim(struct block_device *bdev, void *holder); 1992 void bd_abort_claiming(struct block_device *bdev, void *holder); 1993 void blkdev_put(struct block_device *bdev, fmode_t mode); 1994 1995 /* just for blk-cgroup, don't use elsewhere */ 1996 struct block_device *blkdev_get_no_open(dev_t dev); 1997 void blkdev_put_no_open(struct block_device *bdev); 1998 1999 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 2000 void bdev_add(struct block_device *bdev, dev_t dev); 2001 struct block_device *I_BDEV(struct inode *inode); 2002 struct block_device *bdgrab(struct block_device *bdev); 2003 void bdput(struct block_device *); 2004 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 2005 loff_t lend); 2006 2007 #ifdef CONFIG_BLOCK 2008 void invalidate_bdev(struct block_device *bdev); 2009 int sync_blockdev(struct block_device *bdev); 2010 #else 2011 static inline void invalidate_bdev(struct block_device *bdev) 2012 { 2013 } 2014 static inline int sync_blockdev(struct block_device *bdev) 2015 { 2016 return 0; 2017 } 2018 #endif 2019 int fsync_bdev(struct block_device *bdev); 2020 2021 int freeze_bdev(struct block_device *bdev); 2022 int thaw_bdev(struct block_device *bdev); 2023 2024 #endif /* _LINUX_BLKDEV_H */ 2025