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 /* elevator knows about this request */ 69 #define RQF_SORTED ((__force req_flags_t)(1 << 0)) 70 /* drive already may have started this one */ 71 #define RQF_STARTED ((__force req_flags_t)(1 << 1)) 72 /* may not be passed by ioscheduler */ 73 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) 74 /* request for flush sequence */ 75 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) 76 /* merge of different types, fail separately */ 77 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) 78 /* track inflight for MQ */ 79 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) 80 /* don't call prep for this one */ 81 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) 82 /* vaguely specified driver internal error. Ignored by the block layer */ 83 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 84 /* don't warn about errors */ 85 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 86 /* elevator private data attached */ 87 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 88 /* account into disk and partition IO statistics */ 89 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 90 /* request came from our alloc pool */ 91 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) 92 /* runtime pm request */ 93 #define RQF_PM ((__force req_flags_t)(1 << 15)) 94 /* on IO scheduler merge hash */ 95 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 96 /* track IO completion time */ 97 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 98 /* Look at ->special_vec for the actual data payload instead of the 99 bio chain. */ 100 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 101 /* The per-zone write lock is held for this request */ 102 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 103 /* already slept for hybrid poll */ 104 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 105 /* ->timeout has been called, don't expire again */ 106 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 107 108 /* flags that prevent us from merging requests: */ 109 #define RQF_NOMERGE_FLAGS \ 110 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 111 112 /* 113 * Request state for blk-mq. 114 */ 115 enum mq_rq_state { 116 MQ_RQ_IDLE = 0, 117 MQ_RQ_IN_FLIGHT = 1, 118 MQ_RQ_COMPLETE = 2, 119 }; 120 121 /* 122 * Try to put the fields that are referenced together in the same cacheline. 123 * 124 * If you modify this structure, make sure to update blk_rq_init() and 125 * especially blk_mq_rq_ctx_init() to take care of the added fields. 126 */ 127 struct request { 128 struct request_queue *q; 129 struct blk_mq_ctx *mq_ctx; 130 struct blk_mq_hw_ctx *mq_hctx; 131 132 unsigned int cmd_flags; /* op and common flags */ 133 req_flags_t rq_flags; 134 135 int tag; 136 int internal_tag; 137 138 /* the following two fields are internal, NEVER access directly */ 139 unsigned int __data_len; /* total data len */ 140 sector_t __sector; /* sector cursor */ 141 142 struct bio *bio; 143 struct bio *biotail; 144 145 struct list_head queuelist; 146 147 /* 148 * The hash is used inside the scheduler, and killed once the 149 * request reaches the dispatch list. The ipi_list is only used 150 * to queue the request for softirq completion, which is long 151 * after the request has been unhashed (and even removed from 152 * the dispatch list). 153 */ 154 union { 155 struct hlist_node hash; /* merge hash */ 156 struct list_head ipi_list; 157 }; 158 159 /* 160 * The rb_node is only used inside the io scheduler, requests 161 * are pruned when moved to the dispatch queue. So let the 162 * completion_data share space with the rb_node. 163 */ 164 union { 165 struct rb_node rb_node; /* sort/lookup */ 166 struct bio_vec special_vec; 167 void *completion_data; 168 int error_count; /* for legacy drivers, don't use */ 169 }; 170 171 /* 172 * Three pointers are available for the IO schedulers, if they need 173 * more they have to dynamically allocate it. Flush requests are 174 * never put on the IO scheduler. So let the flush fields share 175 * space with the elevator data. 176 */ 177 union { 178 struct { 179 struct io_cq *icq; 180 void *priv[2]; 181 } elv; 182 183 struct { 184 unsigned int seq; 185 struct list_head list; 186 rq_end_io_fn *saved_end_io; 187 } flush; 188 }; 189 190 struct gendisk *rq_disk; 191 struct block_device *part; 192 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 193 /* Time that the first bio started allocating this request. */ 194 u64 alloc_time_ns; 195 #endif 196 /* Time that this request was allocated for this IO. */ 197 u64 start_time_ns; 198 /* Time that I/O was submitted to the device. */ 199 u64 io_start_time_ns; 200 201 #ifdef CONFIG_BLK_WBT 202 unsigned short wbt_flags; 203 #endif 204 /* 205 * rq sectors used for blk stats. It has the same value 206 * with blk_rq_sectors(rq), except that it never be zeroed 207 * by completion. 208 */ 209 unsigned short stats_sectors; 210 211 /* 212 * Number of scatter-gather DMA addr+len pairs after 213 * physical address coalescing is performed. 214 */ 215 unsigned short nr_phys_segments; 216 217 #if defined(CONFIG_BLK_DEV_INTEGRITY) 218 unsigned short nr_integrity_segments; 219 #endif 220 221 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 222 struct bio_crypt_ctx *crypt_ctx; 223 struct blk_ksm_keyslot *crypt_keyslot; 224 #endif 225 226 unsigned short write_hint; 227 unsigned short ioprio; 228 229 enum mq_rq_state state; 230 refcount_t ref; 231 232 unsigned int timeout; 233 unsigned long deadline; 234 235 union { 236 struct __call_single_data csd; 237 u64 fifo_time; 238 }; 239 240 /* 241 * completion callback. 242 */ 243 rq_end_io_fn *end_io; 244 void *end_io_data; 245 }; 246 247 static inline bool blk_op_is_scsi(unsigned int op) 248 { 249 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 250 } 251 252 static inline bool blk_op_is_private(unsigned int op) 253 { 254 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 255 } 256 257 static inline bool blk_rq_is_scsi(struct request *rq) 258 { 259 return blk_op_is_scsi(req_op(rq)); 260 } 261 262 static inline bool blk_rq_is_private(struct request *rq) 263 { 264 return blk_op_is_private(req_op(rq)); 265 } 266 267 static inline bool blk_rq_is_passthrough(struct request *rq) 268 { 269 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 270 } 271 272 static inline bool bio_is_passthrough(struct bio *bio) 273 { 274 unsigned op = bio_op(bio); 275 276 return blk_op_is_scsi(op) || blk_op_is_private(op); 277 } 278 279 static inline unsigned short req_get_ioprio(struct request *req) 280 { 281 return req->ioprio; 282 } 283 284 #include <linux/elevator.h> 285 286 struct blk_queue_ctx; 287 288 struct bio_vec; 289 290 enum blk_eh_timer_return { 291 BLK_EH_DONE, /* drivers has completed the command */ 292 BLK_EH_RESET_TIMER, /* reset timer and try again */ 293 }; 294 295 enum blk_queue_state { 296 Queue_down, 297 Queue_up, 298 }; 299 300 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ 301 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ 302 303 #define BLK_SCSI_MAX_CMDS (256) 304 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 305 306 /* 307 * Zoned block device models (zoned limit). 308 * 309 * Note: This needs to be ordered from the least to the most severe 310 * restrictions for the inheritance in blk_stack_limits() to work. 311 */ 312 enum blk_zoned_model { 313 BLK_ZONED_NONE = 0, /* Regular block device */ 314 BLK_ZONED_HA, /* Host-aware zoned block device */ 315 BLK_ZONED_HM, /* Host-managed zoned block device */ 316 }; 317 318 struct queue_limits { 319 unsigned long bounce_pfn; 320 unsigned long seg_boundary_mask; 321 unsigned long virt_boundary_mask; 322 323 unsigned int max_hw_sectors; 324 unsigned int max_dev_sectors; 325 unsigned int chunk_sectors; 326 unsigned int max_sectors; 327 unsigned int max_segment_size; 328 unsigned int physical_block_size; 329 unsigned int logical_block_size; 330 unsigned int alignment_offset; 331 unsigned int io_min; 332 unsigned int io_opt; 333 unsigned int max_discard_sectors; 334 unsigned int max_hw_discard_sectors; 335 unsigned int max_write_same_sectors; 336 unsigned int max_write_zeroes_sectors; 337 unsigned int max_zone_append_sectors; 338 unsigned int discard_granularity; 339 unsigned int discard_alignment; 340 341 unsigned short max_segments; 342 unsigned short max_integrity_segments; 343 unsigned short max_discard_segments; 344 345 unsigned char misaligned; 346 unsigned char discard_misaligned; 347 unsigned char raid_partial_stripes_expensive; 348 enum blk_zoned_model zoned; 349 }; 350 351 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 352 void *data); 353 354 void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); 355 356 #ifdef CONFIG_BLK_DEV_ZONED 357 358 #define BLK_ALL_ZONES ((unsigned int)-1) 359 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 360 unsigned int nr_zones, report_zones_cb cb, void *data); 361 unsigned int blkdev_nr_zones(struct gendisk *disk); 362 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, 363 sector_t sectors, sector_t nr_sectors, 364 gfp_t gfp_mask); 365 int blk_revalidate_disk_zones(struct gendisk *disk, 366 void (*update_driver_data)(struct gendisk *disk)); 367 368 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 369 unsigned int cmd, unsigned long arg); 370 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, 371 unsigned int cmd, unsigned long arg); 372 373 #else /* CONFIG_BLK_DEV_ZONED */ 374 375 static inline unsigned int blkdev_nr_zones(struct gendisk *disk) 376 { 377 return 0; 378 } 379 380 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 381 fmode_t mode, unsigned int cmd, 382 unsigned long arg) 383 { 384 return -ENOTTY; 385 } 386 387 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 388 fmode_t mode, unsigned int cmd, 389 unsigned long arg) 390 { 391 return -ENOTTY; 392 } 393 394 #endif /* CONFIG_BLK_DEV_ZONED */ 395 396 struct request_queue { 397 struct request *last_merge; 398 struct elevator_queue *elevator; 399 400 struct percpu_ref q_usage_counter; 401 402 struct blk_queue_stats *stats; 403 struct rq_qos *rq_qos; 404 405 const struct blk_mq_ops *mq_ops; 406 407 /* sw queues */ 408 struct blk_mq_ctx __percpu *queue_ctx; 409 410 unsigned int queue_depth; 411 412 /* hw dispatch queues */ 413 struct blk_mq_hw_ctx **queue_hw_ctx; 414 unsigned int nr_hw_queues; 415 416 struct backing_dev_info *backing_dev_info; 417 418 /* 419 * The queue owner gets to use this for whatever they like. 420 * ll_rw_blk doesn't touch it. 421 */ 422 void *queuedata; 423 424 /* 425 * various queue flags, see QUEUE_* below 426 */ 427 unsigned long queue_flags; 428 /* 429 * Number of contexts that have called blk_set_pm_only(). If this 430 * counter is above zero then only RQF_PM requests are processed. 431 */ 432 atomic_t pm_only; 433 434 /* 435 * ida allocated id for this queue. Used to index queues from 436 * ioctx. 437 */ 438 int id; 439 440 /* 441 * queue needs bounce pages for pages above this limit 442 */ 443 gfp_t bounce_gfp; 444 445 spinlock_t queue_lock; 446 447 /* 448 * queue kobject 449 */ 450 struct kobject kobj; 451 452 /* 453 * mq queue kobject 454 */ 455 struct kobject *mq_kobj; 456 457 #ifdef CONFIG_BLK_DEV_INTEGRITY 458 struct blk_integrity integrity; 459 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 460 461 #ifdef CONFIG_PM 462 struct device *dev; 463 enum rpm_status rpm_status; 464 unsigned int nr_pending; 465 #endif 466 467 /* 468 * queue settings 469 */ 470 unsigned long nr_requests; /* Max # of requests */ 471 472 unsigned int dma_pad_mask; 473 unsigned int dma_alignment; 474 475 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 476 /* Inline crypto capabilities */ 477 struct blk_keyslot_manager *ksm; 478 #endif 479 480 unsigned int rq_timeout; 481 int poll_nsec; 482 483 struct blk_stat_callback *poll_cb; 484 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; 485 486 struct timer_list timeout; 487 struct work_struct timeout_work; 488 489 atomic_t nr_active_requests_shared_sbitmap; 490 491 struct list_head icq_list; 492 #ifdef CONFIG_BLK_CGROUP 493 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 494 struct blkcg_gq *root_blkg; 495 struct list_head blkg_list; 496 #endif 497 498 struct queue_limits limits; 499 500 unsigned int required_elevator_features; 501 502 #ifdef CONFIG_BLK_DEV_ZONED 503 /* 504 * Zoned block device information for request dispatch control. 505 * nr_zones is the total number of zones of the device. This is always 506 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 507 * bits which indicates if a zone is conventional (bit set) or 508 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 509 * bits which indicates if a zone is write locked, that is, if a write 510 * request targeting the zone was dispatched. All three fields are 511 * initialized by the low level device driver (e.g. scsi/sd.c). 512 * Stacking drivers (device mappers) may or may not initialize 513 * these fields. 514 * 515 * Reads of this information must be protected with blk_queue_enter() / 516 * blk_queue_exit(). Modifying this information is only allowed while 517 * no requests are being processed. See also blk_mq_freeze_queue() and 518 * blk_mq_unfreeze_queue(). 519 */ 520 unsigned int nr_zones; 521 unsigned long *conv_zones_bitmap; 522 unsigned long *seq_zones_wlock; 523 unsigned int max_open_zones; 524 unsigned int max_active_zones; 525 #endif /* CONFIG_BLK_DEV_ZONED */ 526 527 /* 528 * sg stuff 529 */ 530 unsigned int sg_timeout; 531 unsigned int sg_reserved_size; 532 int node; 533 struct mutex debugfs_mutex; 534 #ifdef CONFIG_BLK_DEV_IO_TRACE 535 struct blk_trace __rcu *blk_trace; 536 #endif 537 /* 538 * for flush operations 539 */ 540 struct blk_flush_queue *fq; 541 542 struct list_head requeue_list; 543 spinlock_t requeue_lock; 544 struct delayed_work requeue_work; 545 546 struct mutex sysfs_lock; 547 struct mutex sysfs_dir_lock; 548 549 /* 550 * for reusing dead hctx instance in case of updating 551 * nr_hw_queues 552 */ 553 struct list_head unused_hctx_list; 554 spinlock_t unused_hctx_lock; 555 556 int mq_freeze_depth; 557 558 #if defined(CONFIG_BLK_DEV_BSG) 559 struct bsg_class_device bsg_dev; 560 #endif 561 562 #ifdef CONFIG_BLK_DEV_THROTTLING 563 /* Throttle data */ 564 struct throtl_data *td; 565 #endif 566 struct rcu_head rcu_head; 567 wait_queue_head_t mq_freeze_wq; 568 /* 569 * Protect concurrent access to q_usage_counter by 570 * percpu_ref_kill() and percpu_ref_reinit(). 571 */ 572 struct mutex mq_freeze_lock; 573 574 struct blk_mq_tag_set *tag_set; 575 struct list_head tag_set_list; 576 struct bio_set bio_split; 577 578 struct dentry *debugfs_dir; 579 580 #ifdef CONFIG_BLK_DEBUG_FS 581 struct dentry *sched_debugfs_dir; 582 struct dentry *rqos_debugfs_dir; 583 #endif 584 585 bool mq_sysfs_init_done; 586 587 size_t cmd_size; 588 589 #define BLK_MAX_WRITE_HINTS 5 590 u64 write_hints[BLK_MAX_WRITE_HINTS]; 591 }; 592 593 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 594 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 595 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 596 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 597 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 598 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 599 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 600 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 601 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 602 #define QUEUE_FLAG_DISCARD 8 /* supports DISCARD */ 603 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 604 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 605 #define QUEUE_FLAG_SECERASE 11 /* supports secure erase */ 606 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 607 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 608 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 609 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 610 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 611 #define QUEUE_FLAG_WC 17 /* Write back caching */ 612 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 613 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 614 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 615 #define QUEUE_FLAG_POLL_STATS 21 /* collecting stats for hybrid polling */ 616 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 617 #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ 618 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 619 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 620 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 621 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 622 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 623 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 624 625 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 626 (1 << QUEUE_FLAG_SAME_COMP) | \ 627 (1 << QUEUE_FLAG_NOWAIT)) 628 629 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 630 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 631 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 632 633 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 634 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 635 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 636 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 637 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 638 #define blk_queue_noxmerges(q) \ 639 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 640 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 641 #define blk_queue_stable_writes(q) \ 642 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 643 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 644 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 645 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 646 #define blk_queue_zone_resetall(q) \ 647 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 648 #define blk_queue_secure_erase(q) \ 649 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 650 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 651 #define blk_queue_scsi_passthrough(q) \ 652 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 653 #define blk_queue_pci_p2pdma(q) \ 654 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 655 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 656 #define blk_queue_rq_alloc_time(q) \ 657 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 658 #else 659 #define blk_queue_rq_alloc_time(q) false 660 #endif 661 662 #define blk_noretry_request(rq) \ 663 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 664 REQ_FAILFAST_DRIVER)) 665 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 666 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 667 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 668 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 669 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) 670 671 extern void blk_set_pm_only(struct request_queue *q); 672 extern void blk_clear_pm_only(struct request_queue *q); 673 674 static inline bool blk_account_rq(struct request *rq) 675 { 676 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 677 } 678 679 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 680 681 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 682 683 #define rq_dma_dir(rq) \ 684 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 685 686 #define dma_map_bvec(dev, bv, dir, attrs) \ 687 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 688 (dir), (attrs)) 689 690 static inline bool queue_is_mq(struct request_queue *q) 691 { 692 return q->mq_ops; 693 } 694 695 #ifdef CONFIG_PM 696 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 697 { 698 return q->rpm_status; 699 } 700 #else 701 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 702 { 703 return RPM_ACTIVE; 704 } 705 #endif 706 707 static inline enum blk_zoned_model 708 blk_queue_zoned_model(struct request_queue *q) 709 { 710 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) 711 return q->limits.zoned; 712 return BLK_ZONED_NONE; 713 } 714 715 static inline bool blk_queue_is_zoned(struct request_queue *q) 716 { 717 switch (blk_queue_zoned_model(q)) { 718 case BLK_ZONED_HA: 719 case BLK_ZONED_HM: 720 return true; 721 default: 722 return false; 723 } 724 } 725 726 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 727 { 728 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 729 } 730 731 #ifdef CONFIG_BLK_DEV_ZONED 732 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 733 { 734 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 735 } 736 737 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 738 sector_t sector) 739 { 740 if (!blk_queue_is_zoned(q)) 741 return 0; 742 return sector >> ilog2(q->limits.chunk_sectors); 743 } 744 745 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 746 sector_t sector) 747 { 748 if (!blk_queue_is_zoned(q)) 749 return false; 750 if (!q->conv_zones_bitmap) 751 return true; 752 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 753 } 754 755 static inline void blk_queue_max_open_zones(struct request_queue *q, 756 unsigned int max_open_zones) 757 { 758 q->max_open_zones = max_open_zones; 759 } 760 761 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 762 { 763 return q->max_open_zones; 764 } 765 766 static inline void blk_queue_max_active_zones(struct request_queue *q, 767 unsigned int max_active_zones) 768 { 769 q->max_active_zones = max_active_zones; 770 } 771 772 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 773 { 774 return q->max_active_zones; 775 } 776 #else /* CONFIG_BLK_DEV_ZONED */ 777 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 778 { 779 return 0; 780 } 781 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 782 sector_t sector) 783 { 784 return false; 785 } 786 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 787 sector_t sector) 788 { 789 return 0; 790 } 791 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 792 { 793 return 0; 794 } 795 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 796 { 797 return 0; 798 } 799 #endif /* CONFIG_BLK_DEV_ZONED */ 800 801 static inline bool rq_is_sync(struct request *rq) 802 { 803 return op_is_sync(rq->cmd_flags); 804 } 805 806 static inline bool rq_mergeable(struct request *rq) 807 { 808 if (blk_rq_is_passthrough(rq)) 809 return false; 810 811 if (req_op(rq) == REQ_OP_FLUSH) 812 return false; 813 814 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 815 return false; 816 817 if (req_op(rq) == REQ_OP_ZONE_APPEND) 818 return false; 819 820 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 821 return false; 822 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 823 return false; 824 825 return true; 826 } 827 828 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 829 { 830 if (bio_page(a) == bio_page(b) && 831 bio_offset(a) == bio_offset(b)) 832 return true; 833 834 return false; 835 } 836 837 static inline unsigned int blk_queue_depth(struct request_queue *q) 838 { 839 if (q->queue_depth) 840 return q->queue_depth; 841 842 return q->nr_requests; 843 } 844 845 extern unsigned long blk_max_low_pfn, blk_max_pfn; 846 847 /* 848 * standard bounce addresses: 849 * 850 * BLK_BOUNCE_HIGH : bounce all highmem pages 851 * BLK_BOUNCE_ANY : don't bounce anything 852 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 853 */ 854 855 #if BITS_PER_LONG == 32 856 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 857 #else 858 #define BLK_BOUNCE_HIGH -1ULL 859 #endif 860 #define BLK_BOUNCE_ANY (-1ULL) 861 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 862 863 /* 864 * default timeout for SG_IO if none specified 865 */ 866 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 867 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 868 869 struct rq_map_data { 870 struct page **pages; 871 int page_order; 872 int nr_entries; 873 unsigned long offset; 874 int null_mapped; 875 int from_user; 876 }; 877 878 struct req_iterator { 879 struct bvec_iter iter; 880 struct bio *bio; 881 }; 882 883 /* This should not be used directly - use rq_for_each_segment */ 884 #define for_each_bio(_bio) \ 885 for (; _bio; _bio = _bio->bi_next) 886 #define __rq_for_each_bio(_bio, rq) \ 887 if ((rq->bio)) \ 888 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 889 890 #define rq_for_each_segment(bvl, _rq, _iter) \ 891 __rq_for_each_bio(_iter.bio, _rq) \ 892 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 893 894 #define rq_for_each_bvec(bvl, _rq, _iter) \ 895 __rq_for_each_bio(_iter.bio, _rq) \ 896 bio_for_each_bvec(bvl, _iter.bio, _iter.iter) 897 898 #define rq_iter_last(bvec, _iter) \ 899 (_iter.bio->bi_next == NULL && \ 900 bio_iter_last(bvec, _iter.iter)) 901 902 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 903 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 904 #endif 905 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 906 extern void rq_flush_dcache_pages(struct request *rq); 907 #else 908 static inline void rq_flush_dcache_pages(struct request *rq) 909 { 910 } 911 #endif 912 913 extern int blk_register_queue(struct gendisk *disk); 914 extern void blk_unregister_queue(struct gendisk *disk); 915 blk_qc_t submit_bio_noacct(struct bio *bio); 916 extern void blk_rq_init(struct request_queue *q, struct request *rq); 917 extern void blk_put_request(struct request *); 918 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 919 blk_mq_req_flags_t flags); 920 extern int blk_lld_busy(struct request_queue *q); 921 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 922 struct bio_set *bs, gfp_t gfp_mask, 923 int (*bio_ctr)(struct bio *, struct bio *, void *), 924 void *data); 925 extern void blk_rq_unprep_clone(struct request *rq); 926 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 927 struct request *rq); 928 extern int blk_rq_append_bio(struct request *rq, struct bio **bio); 929 extern void blk_queue_split(struct bio **); 930 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 931 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 932 unsigned int, void __user *); 933 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 934 unsigned int, void __user *); 935 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 936 struct scsi_ioctl_command __user *); 937 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); 938 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); 939 940 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 941 extern void blk_queue_exit(struct request_queue *q); 942 extern void blk_sync_queue(struct request_queue *q); 943 extern int blk_rq_map_user(struct request_queue *, struct request *, 944 struct rq_map_data *, void __user *, unsigned long, 945 gfp_t); 946 extern int blk_rq_unmap_user(struct bio *); 947 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 948 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 949 struct rq_map_data *, const struct iov_iter *, 950 gfp_t); 951 extern void blk_execute_rq(struct request_queue *, struct gendisk *, 952 struct request *, int); 953 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 954 struct request *, int, rq_end_io_fn *); 955 956 /* Helper to convert REQ_OP_XXX to its string format XXX */ 957 extern const char *blk_op_str(unsigned int op); 958 959 int blk_status_to_errno(blk_status_t status); 960 blk_status_t errno_to_blk_status(int errno); 961 962 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); 963 964 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 965 { 966 return bdev->bd_disk->queue; /* this is never NULL */ 967 } 968 969 /* 970 * The basic unit of block I/O is a sector. It is used in a number of contexts 971 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 972 * bytes. Variables of type sector_t represent an offset or size that is a 973 * multiple of 512 bytes. Hence these two constants. 974 */ 975 #ifndef SECTOR_SHIFT 976 #define SECTOR_SHIFT 9 977 #endif 978 #ifndef SECTOR_SIZE 979 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 980 #endif 981 982 /* 983 * blk_rq_pos() : the current sector 984 * blk_rq_bytes() : bytes left in the entire request 985 * blk_rq_cur_bytes() : bytes left in the current segment 986 * blk_rq_err_bytes() : bytes left till the next error boundary 987 * blk_rq_sectors() : sectors left in the entire request 988 * blk_rq_cur_sectors() : sectors left in the current segment 989 * blk_rq_stats_sectors() : sectors of the entire request used for stats 990 */ 991 static inline sector_t blk_rq_pos(const struct request *rq) 992 { 993 return rq->__sector; 994 } 995 996 static inline unsigned int blk_rq_bytes(const struct request *rq) 997 { 998 return rq->__data_len; 999 } 1000 1001 static inline int blk_rq_cur_bytes(const struct request *rq) 1002 { 1003 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 1004 } 1005 1006 extern unsigned int blk_rq_err_bytes(const struct request *rq); 1007 1008 static inline unsigned int blk_rq_sectors(const struct request *rq) 1009 { 1010 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 1011 } 1012 1013 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 1014 { 1015 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 1016 } 1017 1018 static inline unsigned int blk_rq_stats_sectors(const struct request *rq) 1019 { 1020 return rq->stats_sectors; 1021 } 1022 1023 #ifdef CONFIG_BLK_DEV_ZONED 1024 1025 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 1026 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 1027 1028 static inline unsigned int blk_rq_zone_no(struct request *rq) 1029 { 1030 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1031 } 1032 1033 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1034 { 1035 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1036 } 1037 #endif /* CONFIG_BLK_DEV_ZONED */ 1038 1039 /* 1040 * Some commands like WRITE SAME have a payload or data transfer size which 1041 * is different from the size of the request. Any driver that supports such 1042 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1043 * calculate the data transfer size. 1044 */ 1045 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1046 { 1047 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1048 return rq->special_vec.bv_len; 1049 return blk_rq_bytes(rq); 1050 } 1051 1052 /* 1053 * Return the first full biovec in the request. The caller needs to check that 1054 * there are any bvecs before calling this helper. 1055 */ 1056 static inline struct bio_vec req_bvec(struct request *rq) 1057 { 1058 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1059 return rq->special_vec; 1060 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); 1061 } 1062 1063 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1064 int op) 1065 { 1066 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1067 return min(q->limits.max_discard_sectors, 1068 UINT_MAX >> SECTOR_SHIFT); 1069 1070 if (unlikely(op == REQ_OP_WRITE_SAME)) 1071 return q->limits.max_write_same_sectors; 1072 1073 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1074 return q->limits.max_write_zeroes_sectors; 1075 1076 return q->limits.max_sectors; 1077 } 1078 1079 /* 1080 * Return maximum size of a request at given offset. Only valid for 1081 * file system requests. 1082 */ 1083 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1084 sector_t offset, 1085 unsigned int chunk_sectors) 1086 { 1087 if (!chunk_sectors) { 1088 if (q->limits.chunk_sectors) 1089 chunk_sectors = q->limits.chunk_sectors; 1090 else 1091 return q->limits.max_sectors; 1092 } 1093 1094 if (likely(is_power_of_2(chunk_sectors))) 1095 chunk_sectors -= offset & (chunk_sectors - 1); 1096 else 1097 chunk_sectors -= sector_div(offset, chunk_sectors); 1098 1099 return min(q->limits.max_sectors, chunk_sectors); 1100 } 1101 1102 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1103 sector_t offset) 1104 { 1105 struct request_queue *q = rq->q; 1106 1107 if (blk_rq_is_passthrough(rq)) 1108 return q->limits.max_hw_sectors; 1109 1110 if (!q->limits.chunk_sectors || 1111 req_op(rq) == REQ_OP_DISCARD || 1112 req_op(rq) == REQ_OP_SECURE_ERASE) 1113 return blk_queue_get_max_sectors(q, req_op(rq)); 1114 1115 return min(blk_max_size_offset(q, offset, 0), 1116 blk_queue_get_max_sectors(q, req_op(rq))); 1117 } 1118 1119 static inline unsigned int blk_rq_count_bios(struct request *rq) 1120 { 1121 unsigned int nr_bios = 0; 1122 struct bio *bio; 1123 1124 __rq_for_each_bio(bio, rq) 1125 nr_bios++; 1126 1127 return nr_bios; 1128 } 1129 1130 void blk_steal_bios(struct bio_list *list, struct request *rq); 1131 1132 /* 1133 * Request completion related functions. 1134 * 1135 * blk_update_request() completes given number of bytes and updates 1136 * the request without completing it. 1137 */ 1138 extern bool blk_update_request(struct request *rq, blk_status_t error, 1139 unsigned int nr_bytes); 1140 1141 extern void blk_abort_request(struct request *); 1142 1143 /* 1144 * Access functions for manipulating queue properties 1145 */ 1146 extern void blk_cleanup_queue(struct request_queue *); 1147 extern void blk_queue_bounce_limit(struct request_queue *, u64); 1148 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1149 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1150 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1151 extern void blk_queue_max_discard_segments(struct request_queue *, 1152 unsigned short); 1153 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1154 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1155 unsigned int max_discard_sectors); 1156 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1157 unsigned int max_write_same_sectors); 1158 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1159 unsigned int max_write_same_sectors); 1160 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 1161 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 1162 unsigned int max_zone_append_sectors); 1163 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1164 extern void blk_queue_alignment_offset(struct request_queue *q, 1165 unsigned int alignment); 1166 void blk_queue_update_readahead(struct request_queue *q); 1167 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1168 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1169 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1170 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1171 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1172 extern void blk_set_default_limits(struct queue_limits *lim); 1173 extern void blk_set_stacking_limits(struct queue_limits *lim); 1174 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1175 sector_t offset); 1176 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1177 sector_t offset); 1178 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1179 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1180 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1181 extern void blk_queue_dma_alignment(struct request_queue *, int); 1182 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1183 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1184 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1185 extern void blk_queue_required_elevator_features(struct request_queue *q, 1186 unsigned int features); 1187 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1188 struct device *dev); 1189 1190 /* 1191 * Number of physical segments as sent to the device. 1192 * 1193 * Normally this is the number of discontiguous data segments sent by the 1194 * submitter. But for data-less command like discard we might have no 1195 * actual data segments submitted, but the driver might have to add it's 1196 * own special payload. In that case we still return 1 here so that this 1197 * special payload will be mapped. 1198 */ 1199 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1200 { 1201 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1202 return 1; 1203 return rq->nr_phys_segments; 1204 } 1205 1206 /* 1207 * Number of discard segments (or ranges) the driver needs to fill in. 1208 * Each discard bio merged into a request is counted as one segment. 1209 */ 1210 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1211 { 1212 return max_t(unsigned short, rq->nr_phys_segments, 1); 1213 } 1214 1215 int __blk_rq_map_sg(struct request_queue *q, struct request *rq, 1216 struct scatterlist *sglist, struct scatterlist **last_sg); 1217 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, 1218 struct scatterlist *sglist) 1219 { 1220 struct scatterlist *last_sg = NULL; 1221 1222 return __blk_rq_map_sg(q, rq, sglist, &last_sg); 1223 } 1224 extern void blk_dump_rq_flags(struct request *, char *); 1225 1226 bool __must_check blk_get_queue(struct request_queue *); 1227 struct request_queue *blk_alloc_queue(int node_id); 1228 extern void blk_put_queue(struct request_queue *); 1229 extern void blk_set_queue_dying(struct request_queue *); 1230 1231 #ifdef CONFIG_BLOCK 1232 /* 1233 * blk_plug permits building a queue of related requests by holding the I/O 1234 * fragments for a short period. This allows merging of sequential requests 1235 * into single larger request. As the requests are moved from a per-task list to 1236 * the device's request_queue in a batch, this results in improved scalability 1237 * as the lock contention for request_queue lock is reduced. 1238 * 1239 * It is ok not to disable preemption when adding the request to the plug list 1240 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1241 * the plug list when the task sleeps by itself. For details, please see 1242 * schedule() where blk_schedule_flush_plug() is called. 1243 */ 1244 struct blk_plug { 1245 struct list_head mq_list; /* blk-mq requests */ 1246 struct list_head cb_list; /* md requires an unplug callback */ 1247 unsigned short rq_count; 1248 bool multiple_queues; 1249 bool nowait; 1250 }; 1251 #define BLK_MAX_REQUEST_COUNT 16 1252 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1253 1254 struct blk_plug_cb; 1255 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1256 struct blk_plug_cb { 1257 struct list_head list; 1258 blk_plug_cb_fn callback; 1259 void *data; 1260 }; 1261 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1262 void *data, int size); 1263 extern void blk_start_plug(struct blk_plug *); 1264 extern void blk_finish_plug(struct blk_plug *); 1265 extern void blk_flush_plug_list(struct blk_plug *, bool); 1266 1267 static inline void blk_flush_plug(struct task_struct *tsk) 1268 { 1269 struct blk_plug *plug = tsk->plug; 1270 1271 if (plug) 1272 blk_flush_plug_list(plug, false); 1273 } 1274 1275 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1276 { 1277 struct blk_plug *plug = tsk->plug; 1278 1279 if (plug) 1280 blk_flush_plug_list(plug, true); 1281 } 1282 1283 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1284 { 1285 struct blk_plug *plug = tsk->plug; 1286 1287 return plug && 1288 (!list_empty(&plug->mq_list) || 1289 !list_empty(&plug->cb_list)); 1290 } 1291 1292 int blkdev_issue_flush(struct block_device *, gfp_t); 1293 long nr_blockdev_pages(void); 1294 #else /* CONFIG_BLOCK */ 1295 struct blk_plug { 1296 }; 1297 1298 static inline void blk_start_plug(struct blk_plug *plug) 1299 { 1300 } 1301 1302 static inline void blk_finish_plug(struct blk_plug *plug) 1303 { 1304 } 1305 1306 static inline void blk_flush_plug(struct task_struct *task) 1307 { 1308 } 1309 1310 static inline void blk_schedule_flush_plug(struct task_struct *task) 1311 { 1312 } 1313 1314 1315 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1316 { 1317 return false; 1318 } 1319 1320 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask) 1321 { 1322 return 0; 1323 } 1324 1325 static inline long nr_blockdev_pages(void) 1326 { 1327 return 0; 1328 } 1329 #endif /* CONFIG_BLOCK */ 1330 1331 extern void blk_io_schedule(void); 1332 1333 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1334 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1335 1336 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1337 1338 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1339 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1340 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1341 sector_t nr_sects, gfp_t gfp_mask, int flags, 1342 struct bio **biop); 1343 1344 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1345 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1346 1347 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1348 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1349 unsigned flags); 1350 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1351 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1352 1353 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1354 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1355 { 1356 return blkdev_issue_discard(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, flags); 1362 } 1363 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1364 sector_t nr_blocks, gfp_t gfp_mask) 1365 { 1366 return blkdev_issue_zeroout(sb->s_bdev, 1367 block << (sb->s_blocksize_bits - 1368 SECTOR_SHIFT), 1369 nr_blocks << (sb->s_blocksize_bits - 1370 SECTOR_SHIFT), 1371 gfp_mask, 0); 1372 } 1373 1374 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1375 1376 static inline bool bdev_is_partition(struct block_device *bdev) 1377 { 1378 return bdev->bd_partno; 1379 } 1380 1381 enum blk_default_limits { 1382 BLK_MAX_SEGMENTS = 128, 1383 BLK_SAFE_MAX_SECTORS = 255, 1384 BLK_DEF_MAX_SECTORS = 2560, 1385 BLK_MAX_SEGMENT_SIZE = 65536, 1386 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1387 }; 1388 1389 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1390 { 1391 return q->limits.seg_boundary_mask; 1392 } 1393 1394 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1395 { 1396 return q->limits.virt_boundary_mask; 1397 } 1398 1399 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1400 { 1401 return q->limits.max_sectors; 1402 } 1403 1404 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1405 { 1406 return q->limits.max_hw_sectors; 1407 } 1408 1409 static inline unsigned short queue_max_segments(const struct request_queue *q) 1410 { 1411 return q->limits.max_segments; 1412 } 1413 1414 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1415 { 1416 return q->limits.max_discard_segments; 1417 } 1418 1419 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1420 { 1421 return q->limits.max_segment_size; 1422 } 1423 1424 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1425 { 1426 1427 const struct queue_limits *l = &q->limits; 1428 1429 return min(l->max_zone_append_sectors, l->max_sectors); 1430 } 1431 1432 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1433 { 1434 int retval = 512; 1435 1436 if (q && q->limits.logical_block_size) 1437 retval = q->limits.logical_block_size; 1438 1439 return retval; 1440 } 1441 1442 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1443 { 1444 return queue_logical_block_size(bdev_get_queue(bdev)); 1445 } 1446 1447 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1448 { 1449 return q->limits.physical_block_size; 1450 } 1451 1452 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1453 { 1454 return queue_physical_block_size(bdev_get_queue(bdev)); 1455 } 1456 1457 static inline unsigned int queue_io_min(const struct request_queue *q) 1458 { 1459 return q->limits.io_min; 1460 } 1461 1462 static inline int bdev_io_min(struct block_device *bdev) 1463 { 1464 return queue_io_min(bdev_get_queue(bdev)); 1465 } 1466 1467 static inline unsigned int queue_io_opt(const struct request_queue *q) 1468 { 1469 return q->limits.io_opt; 1470 } 1471 1472 static inline int bdev_io_opt(struct block_device *bdev) 1473 { 1474 return queue_io_opt(bdev_get_queue(bdev)); 1475 } 1476 1477 static inline int queue_alignment_offset(const struct request_queue *q) 1478 { 1479 if (q->limits.misaligned) 1480 return -1; 1481 1482 return q->limits.alignment_offset; 1483 } 1484 1485 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1486 { 1487 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1488 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1489 << SECTOR_SHIFT; 1490 1491 return (granularity + lim->alignment_offset - alignment) % granularity; 1492 } 1493 1494 static inline int bdev_alignment_offset(struct block_device *bdev) 1495 { 1496 struct request_queue *q = bdev_get_queue(bdev); 1497 1498 if (q->limits.misaligned) 1499 return -1; 1500 if (bdev_is_partition(bdev)) 1501 return queue_limit_alignment_offset(&q->limits, 1502 bdev->bd_start_sect); 1503 return q->limits.alignment_offset; 1504 } 1505 1506 static inline int queue_discard_alignment(const struct request_queue *q) 1507 { 1508 if (q->limits.discard_misaligned) 1509 return -1; 1510 1511 return q->limits.discard_alignment; 1512 } 1513 1514 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1515 { 1516 unsigned int alignment, granularity, offset; 1517 1518 if (!lim->max_discard_sectors) 1519 return 0; 1520 1521 /* Why are these in bytes, not sectors? */ 1522 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1523 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1524 if (!granularity) 1525 return 0; 1526 1527 /* Offset of the partition start in 'granularity' sectors */ 1528 offset = sector_div(sector, granularity); 1529 1530 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1531 offset = (granularity + alignment - offset) % granularity; 1532 1533 /* Turn it back into bytes, gaah */ 1534 return offset << SECTOR_SHIFT; 1535 } 1536 1537 static inline int bdev_discard_alignment(struct block_device *bdev) 1538 { 1539 struct request_queue *q = bdev_get_queue(bdev); 1540 1541 if (bdev_is_partition(bdev)) 1542 return queue_limit_discard_alignment(&q->limits, 1543 bdev->bd_start_sect); 1544 return q->limits.discard_alignment; 1545 } 1546 1547 static inline unsigned int bdev_write_same(struct block_device *bdev) 1548 { 1549 struct request_queue *q = bdev_get_queue(bdev); 1550 1551 if (q) 1552 return q->limits.max_write_same_sectors; 1553 1554 return 0; 1555 } 1556 1557 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1558 { 1559 struct request_queue *q = bdev_get_queue(bdev); 1560 1561 if (q) 1562 return q->limits.max_write_zeroes_sectors; 1563 1564 return 0; 1565 } 1566 1567 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1568 { 1569 struct request_queue *q = bdev_get_queue(bdev); 1570 1571 if (q) 1572 return blk_queue_zoned_model(q); 1573 1574 return BLK_ZONED_NONE; 1575 } 1576 1577 static inline bool bdev_is_zoned(struct block_device *bdev) 1578 { 1579 struct request_queue *q = bdev_get_queue(bdev); 1580 1581 if (q) 1582 return blk_queue_is_zoned(q); 1583 1584 return false; 1585 } 1586 1587 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1588 { 1589 struct request_queue *q = bdev_get_queue(bdev); 1590 1591 if (q) 1592 return blk_queue_zone_sectors(q); 1593 return 0; 1594 } 1595 1596 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1597 { 1598 struct request_queue *q = bdev_get_queue(bdev); 1599 1600 if (q) 1601 return queue_max_open_zones(q); 1602 return 0; 1603 } 1604 1605 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1606 { 1607 struct request_queue *q = bdev_get_queue(bdev); 1608 1609 if (q) 1610 return queue_max_active_zones(q); 1611 return 0; 1612 } 1613 1614 static inline int queue_dma_alignment(const struct request_queue *q) 1615 { 1616 return q ? q->dma_alignment : 511; 1617 } 1618 1619 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1620 unsigned int len) 1621 { 1622 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1623 return !(addr & alignment) && !(len & alignment); 1624 } 1625 1626 /* assumes size > 256 */ 1627 static inline unsigned int blksize_bits(unsigned int size) 1628 { 1629 unsigned int bits = 8; 1630 do { 1631 bits++; 1632 size >>= 1; 1633 } while (size > 256); 1634 return bits; 1635 } 1636 1637 static inline unsigned int block_size(struct block_device *bdev) 1638 { 1639 return 1 << bdev->bd_inode->i_blkbits; 1640 } 1641 1642 int kblockd_schedule_work(struct work_struct *work); 1643 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1644 1645 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1646 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1647 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1648 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1649 1650 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1651 1652 enum blk_integrity_flags { 1653 BLK_INTEGRITY_VERIFY = 1 << 0, 1654 BLK_INTEGRITY_GENERATE = 1 << 1, 1655 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1656 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1657 }; 1658 1659 struct blk_integrity_iter { 1660 void *prot_buf; 1661 void *data_buf; 1662 sector_t seed; 1663 unsigned int data_size; 1664 unsigned short interval; 1665 const char *disk_name; 1666 }; 1667 1668 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1669 typedef void (integrity_prepare_fn) (struct request *); 1670 typedef void (integrity_complete_fn) (struct request *, unsigned int); 1671 1672 struct blk_integrity_profile { 1673 integrity_processing_fn *generate_fn; 1674 integrity_processing_fn *verify_fn; 1675 integrity_prepare_fn *prepare_fn; 1676 integrity_complete_fn *complete_fn; 1677 const char *name; 1678 }; 1679 1680 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1681 extern void blk_integrity_unregister(struct gendisk *); 1682 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1683 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1684 struct scatterlist *); 1685 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1686 1687 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1688 { 1689 struct blk_integrity *bi = &disk->queue->integrity; 1690 1691 if (!bi->profile) 1692 return NULL; 1693 1694 return bi; 1695 } 1696 1697 static inline 1698 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1699 { 1700 return blk_get_integrity(bdev->bd_disk); 1701 } 1702 1703 static inline bool 1704 blk_integrity_queue_supports_integrity(struct request_queue *q) 1705 { 1706 return q->integrity.profile; 1707 } 1708 1709 static inline bool blk_integrity_rq(struct request *rq) 1710 { 1711 return rq->cmd_flags & REQ_INTEGRITY; 1712 } 1713 1714 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1715 unsigned int segs) 1716 { 1717 q->limits.max_integrity_segments = segs; 1718 } 1719 1720 static inline unsigned short 1721 queue_max_integrity_segments(const struct request_queue *q) 1722 { 1723 return q->limits.max_integrity_segments; 1724 } 1725 1726 /** 1727 * bio_integrity_intervals - Return number of integrity intervals for a bio 1728 * @bi: blk_integrity profile for device 1729 * @sectors: Size of the bio in 512-byte sectors 1730 * 1731 * Description: The block layer calculates everything in 512 byte 1732 * sectors but integrity metadata is done in terms of the data integrity 1733 * interval size of the storage device. Convert the block layer sectors 1734 * to the appropriate number of integrity intervals. 1735 */ 1736 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1737 unsigned int sectors) 1738 { 1739 return sectors >> (bi->interval_exp - 9); 1740 } 1741 1742 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1743 unsigned int sectors) 1744 { 1745 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1746 } 1747 1748 /* 1749 * Return the first bvec that contains integrity data. Only drivers that are 1750 * limited to a single integrity segment should use this helper. 1751 */ 1752 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1753 { 1754 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) 1755 return NULL; 1756 return rq->bio->bi_integrity->bip_vec; 1757 } 1758 1759 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1760 1761 struct bio; 1762 struct block_device; 1763 struct gendisk; 1764 struct blk_integrity; 1765 1766 static inline int blk_integrity_rq(struct request *rq) 1767 { 1768 return 0; 1769 } 1770 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1771 struct bio *b) 1772 { 1773 return 0; 1774 } 1775 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1776 struct bio *b, 1777 struct scatterlist *s) 1778 { 1779 return 0; 1780 } 1781 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1782 { 1783 return NULL; 1784 } 1785 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1786 { 1787 return NULL; 1788 } 1789 static inline bool 1790 blk_integrity_queue_supports_integrity(struct request_queue *q) 1791 { 1792 return false; 1793 } 1794 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1795 { 1796 return 0; 1797 } 1798 static inline void blk_integrity_register(struct gendisk *d, 1799 struct blk_integrity *b) 1800 { 1801 } 1802 static inline void blk_integrity_unregister(struct gendisk *d) 1803 { 1804 } 1805 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1806 unsigned int segs) 1807 { 1808 } 1809 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) 1810 { 1811 return 0; 1812 } 1813 1814 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1815 unsigned int sectors) 1816 { 1817 return 0; 1818 } 1819 1820 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1821 unsigned int sectors) 1822 { 1823 return 0; 1824 } 1825 1826 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1827 { 1828 return NULL; 1829 } 1830 1831 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1832 1833 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1834 1835 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); 1836 1837 void blk_ksm_unregister(struct request_queue *q); 1838 1839 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1840 1841 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, 1842 struct request_queue *q) 1843 { 1844 return true; 1845 } 1846 1847 static inline void blk_ksm_unregister(struct request_queue *q) { } 1848 1849 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1850 1851 1852 struct block_device_operations { 1853 blk_qc_t (*submit_bio) (struct bio *bio); 1854 int (*open) (struct block_device *, fmode_t); 1855 void (*release) (struct gendisk *, fmode_t); 1856 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1857 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1858 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1859 unsigned int (*check_events) (struct gendisk *disk, 1860 unsigned int clearing); 1861 void (*unlock_native_capacity) (struct gendisk *); 1862 int (*revalidate_disk) (struct gendisk *); 1863 int (*getgeo)(struct block_device *, struct hd_geometry *); 1864 int (*set_read_only)(struct block_device *bdev, bool ro); 1865 /* this callback is with swap_lock and sometimes page table lock held */ 1866 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1867 int (*report_zones)(struct gendisk *, sector_t sector, 1868 unsigned int nr_zones, report_zones_cb cb, void *data); 1869 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1870 struct module *owner; 1871 const struct pr_ops *pr_ops; 1872 }; 1873 1874 #ifdef CONFIG_COMPAT 1875 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1876 unsigned int, unsigned long); 1877 #else 1878 #define blkdev_compat_ptr_ioctl NULL 1879 #endif 1880 1881 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1882 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1883 struct writeback_control *); 1884 1885 #ifdef CONFIG_BLK_DEV_ZONED 1886 bool blk_req_needs_zone_write_lock(struct request *rq); 1887 bool blk_req_zone_write_trylock(struct request *rq); 1888 void __blk_req_zone_write_lock(struct request *rq); 1889 void __blk_req_zone_write_unlock(struct request *rq); 1890 1891 static inline void blk_req_zone_write_lock(struct request *rq) 1892 { 1893 if (blk_req_needs_zone_write_lock(rq)) 1894 __blk_req_zone_write_lock(rq); 1895 } 1896 1897 static inline void blk_req_zone_write_unlock(struct request *rq) 1898 { 1899 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1900 __blk_req_zone_write_unlock(rq); 1901 } 1902 1903 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1904 { 1905 return rq->q->seq_zones_wlock && 1906 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1907 } 1908 1909 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1910 { 1911 if (!blk_req_needs_zone_write_lock(rq)) 1912 return true; 1913 return !blk_req_zone_is_write_locked(rq); 1914 } 1915 #else 1916 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1917 { 1918 return false; 1919 } 1920 1921 static inline void blk_req_zone_write_lock(struct request *rq) 1922 { 1923 } 1924 1925 static inline void blk_req_zone_write_unlock(struct request *rq) 1926 { 1927 } 1928 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1929 { 1930 return false; 1931 } 1932 1933 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1934 { 1935 return true; 1936 } 1937 #endif /* CONFIG_BLK_DEV_ZONED */ 1938 1939 static inline void blk_wake_io_task(struct task_struct *waiter) 1940 { 1941 /* 1942 * If we're polling, the task itself is doing the completions. For 1943 * that case, we don't need to signal a wakeup, it's enough to just 1944 * mark us as RUNNING. 1945 */ 1946 if (waiter == current) 1947 __set_current_state(TASK_RUNNING); 1948 else 1949 wake_up_process(waiter); 1950 } 1951 1952 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1953 unsigned int op); 1954 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1955 unsigned long start_time); 1956 1957 unsigned long part_start_io_acct(struct gendisk *disk, 1958 struct block_device **part, struct bio *bio); 1959 void part_end_io_acct(struct block_device *part, struct bio *bio, 1960 unsigned long start_time); 1961 1962 /** 1963 * bio_start_io_acct - start I/O accounting for bio based drivers 1964 * @bio: bio to start account for 1965 * 1966 * Returns the start time that should be passed back to bio_end_io_acct(). 1967 */ 1968 static inline unsigned long bio_start_io_acct(struct bio *bio) 1969 { 1970 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); 1971 } 1972 1973 /** 1974 * bio_end_io_acct - end I/O accounting for bio based drivers 1975 * @bio: bio to end account for 1976 * @start: start time returned by bio_start_io_acct() 1977 */ 1978 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1979 { 1980 return disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time); 1981 } 1982 1983 int bdev_read_only(struct block_device *bdev); 1984 int set_blocksize(struct block_device *bdev, int size); 1985 1986 const char *bdevname(struct block_device *bdev, char *buffer); 1987 int lookup_bdev(const char *pathname, dev_t *dev); 1988 1989 void blkdev_show(struct seq_file *seqf, off_t offset); 1990 1991 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1992 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1993 #ifdef CONFIG_BLOCK 1994 #define BLKDEV_MAJOR_MAX 512 1995 #else 1996 #define BLKDEV_MAJOR_MAX 0 1997 #endif 1998 1999 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 2000 void *holder); 2001 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 2002 int bd_prepare_to_claim(struct block_device *bdev, void *holder); 2003 void bd_abort_claiming(struct block_device *bdev, void *holder); 2004 void blkdev_put(struct block_device *bdev, fmode_t mode); 2005 2006 /* just for blk-cgroup, don't use elsewhere */ 2007 struct block_device *blkdev_get_no_open(dev_t dev); 2008 void blkdev_put_no_open(struct block_device *bdev); 2009 2010 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 2011 void bdev_add(struct block_device *bdev, dev_t dev); 2012 struct block_device *I_BDEV(struct inode *inode); 2013 struct block_device *bdgrab(struct block_device *bdev); 2014 void bdput(struct block_device *); 2015 2016 #ifdef CONFIG_BLOCK 2017 void invalidate_bdev(struct block_device *bdev); 2018 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 2019 loff_t lend); 2020 int sync_blockdev(struct block_device *bdev); 2021 #else 2022 static inline void invalidate_bdev(struct block_device *bdev) 2023 { 2024 } 2025 static inline int truncate_bdev_range(struct block_device *bdev, fmode_t mode, 2026 loff_t lstart, loff_t lend) 2027 { 2028 return 0; 2029 } 2030 static inline int sync_blockdev(struct block_device *bdev) 2031 { 2032 return 0; 2033 } 2034 #endif 2035 int fsync_bdev(struct block_device *bdev); 2036 2037 int freeze_bdev(struct block_device *bdev); 2038 int thaw_bdev(struct block_device *bdev); 2039 2040 #endif /* _LINUX_BLKDEV_H */ 2041