1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_BLKDEV_H 3 #define _LINUX_BLKDEV_H 4 5 #include <linux/sched.h> 6 #include <linux/sched/clock.h> 7 #include <linux/major.h> 8 #include <linux/genhd.h> 9 #include <linux/list.h> 10 #include <linux/llist.h> 11 #include <linux/timer.h> 12 #include <linux/workqueue.h> 13 #include <linux/pagemap.h> 14 #include <linux/backing-dev-defs.h> 15 #include <linux/wait.h> 16 #include <linux/mempool.h> 17 #include <linux/pfn.h> 18 #include <linux/bio.h> 19 #include <linux/stringify.h> 20 #include <linux/gfp.h> 21 #include <linux/bsg.h> 22 #include <linux/smp.h> 23 #include <linux/rcupdate.h> 24 #include <linux/percpu-refcount.h> 25 #include <linux/scatterlist.h> 26 #include <linux/blkzoned.h> 27 #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 /* elevator knows about this request */ 68 #define RQF_SORTED ((__force req_flags_t)(1 << 0)) 69 /* drive already may have started this one */ 70 #define RQF_STARTED ((__force req_flags_t)(1 << 1)) 71 /* may not be passed by ioscheduler */ 72 #define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3)) 73 /* request for flush sequence */ 74 #define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4)) 75 /* merge of different types, fail separately */ 76 #define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5)) 77 /* track inflight for MQ */ 78 #define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6)) 79 /* don't call prep for this one */ 80 #define RQF_DONTPREP ((__force req_flags_t)(1 << 7)) 81 /* set for "ide_preempt" requests and also for requests for which the SCSI 82 "quiesce" state must be ignored. */ 83 #define RQF_PREEMPT ((__force req_flags_t)(1 << 8)) 84 /* vaguely specified driver internal error. Ignored by the block layer */ 85 #define RQF_FAILED ((__force req_flags_t)(1 << 10)) 86 /* don't warn about errors */ 87 #define RQF_QUIET ((__force req_flags_t)(1 << 11)) 88 /* elevator private data attached */ 89 #define RQF_ELVPRIV ((__force req_flags_t)(1 << 12)) 90 /* account into disk and partition IO statistics */ 91 #define RQF_IO_STAT ((__force req_flags_t)(1 << 13)) 92 /* request came from our alloc pool */ 93 #define RQF_ALLOCED ((__force req_flags_t)(1 << 14)) 94 /* runtime pm request */ 95 #define RQF_PM ((__force req_flags_t)(1 << 15)) 96 /* on IO scheduler merge hash */ 97 #define RQF_HASHED ((__force req_flags_t)(1 << 16)) 98 /* track IO completion time */ 99 #define RQF_STATS ((__force req_flags_t)(1 << 17)) 100 /* Look at ->special_vec for the actual data payload instead of the 101 bio chain. */ 102 #define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18)) 103 /* The per-zone write lock is held for this request */ 104 #define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19)) 105 /* already slept for hybrid poll */ 106 #define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 20)) 107 /* ->timeout has been called, don't expire again */ 108 #define RQF_TIMED_OUT ((__force req_flags_t)(1 << 21)) 109 110 /* flags that prevent us from merging requests: */ 111 #define RQF_NOMERGE_FLAGS \ 112 (RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD) 113 114 /* 115 * Request state for blk-mq. 116 */ 117 enum mq_rq_state { 118 MQ_RQ_IDLE = 0, 119 MQ_RQ_IN_FLIGHT = 1, 120 MQ_RQ_COMPLETE = 2, 121 }; 122 123 /* 124 * Try to put the fields that are referenced together in the same cacheline. 125 * 126 * If you modify this structure, make sure to update blk_rq_init() and 127 * especially blk_mq_rq_ctx_init() to take care of the added fields. 128 */ 129 struct request { 130 struct request_queue *q; 131 struct blk_mq_ctx *mq_ctx; 132 struct blk_mq_hw_ctx *mq_hctx; 133 134 unsigned int cmd_flags; /* op and common flags */ 135 req_flags_t rq_flags; 136 137 int tag; 138 int internal_tag; 139 140 /* the following two fields are internal, NEVER access directly */ 141 unsigned int __data_len; /* total data len */ 142 sector_t __sector; /* sector cursor */ 143 144 struct bio *bio; 145 struct bio *biotail; 146 147 struct list_head queuelist; 148 149 /* 150 * The hash is used inside the scheduler, and killed once the 151 * request reaches the dispatch list. The ipi_list is only used 152 * to queue the request for softirq completion, which is long 153 * after the request has been unhashed (and even removed from 154 * the dispatch list). 155 */ 156 union { 157 struct hlist_node hash; /* merge hash */ 158 struct list_head ipi_list; 159 }; 160 161 /* 162 * The rb_node is only used inside the io scheduler, requests 163 * are pruned when moved to the dispatch queue. So let the 164 * completion_data share space with the rb_node. 165 */ 166 union { 167 struct rb_node rb_node; /* sort/lookup */ 168 struct bio_vec special_vec; 169 void *completion_data; 170 int error_count; /* for legacy drivers, don't use */ 171 }; 172 173 /* 174 * Three pointers are available for the IO schedulers, if they need 175 * more they have to dynamically allocate it. Flush requests are 176 * never put on the IO scheduler. So let the flush fields share 177 * space with the elevator data. 178 */ 179 union { 180 struct { 181 struct io_cq *icq; 182 void *priv[2]; 183 } elv; 184 185 struct { 186 unsigned int seq; 187 struct list_head list; 188 rq_end_io_fn *saved_end_io; 189 } flush; 190 }; 191 192 struct gendisk *rq_disk; 193 struct hd_struct *part; 194 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 195 /* Time that the first bio started allocating this request. */ 196 u64 alloc_time_ns; 197 #endif 198 /* Time that this request was allocated for this IO. */ 199 u64 start_time_ns; 200 /* Time that I/O was submitted to the device. */ 201 u64 io_start_time_ns; 202 203 #ifdef CONFIG_BLK_WBT 204 unsigned short wbt_flags; 205 #endif 206 /* 207 * rq sectors used for blk stats. It has the same value 208 * with blk_rq_sectors(rq), except that it never be zeroed 209 * by completion. 210 */ 211 unsigned short stats_sectors; 212 213 /* 214 * Number of scatter-gather DMA addr+len pairs after 215 * physical address coalescing is performed. 216 */ 217 unsigned short nr_phys_segments; 218 219 #if defined(CONFIG_BLK_DEV_INTEGRITY) 220 unsigned short nr_integrity_segments; 221 #endif 222 223 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 224 struct bio_crypt_ctx *crypt_ctx; 225 struct blk_ksm_keyslot *crypt_keyslot; 226 #endif 227 228 unsigned short write_hint; 229 unsigned short ioprio; 230 231 enum mq_rq_state state; 232 refcount_t ref; 233 234 unsigned int timeout; 235 unsigned long deadline; 236 237 union { 238 struct __call_single_data csd; 239 u64 fifo_time; 240 }; 241 242 /* 243 * completion callback. 244 */ 245 rq_end_io_fn *end_io; 246 void *end_io_data; 247 }; 248 249 static inline bool blk_op_is_scsi(unsigned int op) 250 { 251 return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT; 252 } 253 254 static inline bool blk_op_is_private(unsigned int op) 255 { 256 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 257 } 258 259 static inline bool blk_rq_is_scsi(struct request *rq) 260 { 261 return blk_op_is_scsi(req_op(rq)); 262 } 263 264 static inline bool blk_rq_is_private(struct request *rq) 265 { 266 return blk_op_is_private(req_op(rq)); 267 } 268 269 static inline bool blk_rq_is_passthrough(struct request *rq) 270 { 271 return blk_rq_is_scsi(rq) || blk_rq_is_private(rq); 272 } 273 274 static inline bool bio_is_passthrough(struct bio *bio) 275 { 276 unsigned op = bio_op(bio); 277 278 return blk_op_is_scsi(op) || blk_op_is_private(op); 279 } 280 281 static inline unsigned short req_get_ioprio(struct request *req) 282 { 283 return req->ioprio; 284 } 285 286 #include <linux/elevator.h> 287 288 struct blk_queue_ctx; 289 290 struct bio_vec; 291 292 enum blk_eh_timer_return { 293 BLK_EH_DONE, /* drivers has completed the command */ 294 BLK_EH_RESET_TIMER, /* reset timer and try again */ 295 }; 296 297 enum blk_queue_state { 298 Queue_down, 299 Queue_up, 300 }; 301 302 #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ 303 #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ 304 305 #define BLK_SCSI_MAX_CMDS (256) 306 #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) 307 308 /* 309 * Zoned block device models (zoned limit). 310 * 311 * Note: This needs to be ordered from the least to the most severe 312 * restrictions for the inheritance in blk_stack_limits() to work. 313 */ 314 enum blk_zoned_model { 315 BLK_ZONED_NONE = 0, /* Regular block device */ 316 BLK_ZONED_HA, /* Host-aware zoned block device */ 317 BLK_ZONED_HM, /* Host-managed zoned block device */ 318 }; 319 320 struct queue_limits { 321 unsigned long bounce_pfn; 322 unsigned long seg_boundary_mask; 323 unsigned long virt_boundary_mask; 324 325 unsigned int max_hw_sectors; 326 unsigned int max_dev_sectors; 327 unsigned int chunk_sectors; 328 unsigned int max_sectors; 329 unsigned int max_segment_size; 330 unsigned int physical_block_size; 331 unsigned int logical_block_size; 332 unsigned int alignment_offset; 333 unsigned int io_min; 334 unsigned int io_opt; 335 unsigned int max_discard_sectors; 336 unsigned int max_hw_discard_sectors; 337 unsigned int max_write_same_sectors; 338 unsigned int max_write_zeroes_sectors; 339 unsigned int max_zone_append_sectors; 340 unsigned int discard_granularity; 341 unsigned int discard_alignment; 342 343 unsigned short max_segments; 344 unsigned short max_integrity_segments; 345 unsigned short max_discard_segments; 346 347 unsigned char misaligned; 348 unsigned char discard_misaligned; 349 unsigned char raid_partial_stripes_expensive; 350 enum blk_zoned_model zoned; 351 }; 352 353 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 354 void *data); 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 blk_queue_stats *stats; 401 struct rq_qos *rq_qos; 402 403 const struct blk_mq_ops *mq_ops; 404 405 /* sw queues */ 406 struct blk_mq_ctx __percpu *queue_ctx; 407 408 unsigned int queue_depth; 409 410 /* hw dispatch queues */ 411 struct blk_mq_hw_ctx **queue_hw_ctx; 412 unsigned int nr_hw_queues; 413 414 struct backing_dev_info *backing_dev_info; 415 416 /* 417 * The queue owner gets to use this for whatever they like. 418 * ll_rw_blk doesn't touch it. 419 */ 420 void *queuedata; 421 422 /* 423 * various queue flags, see QUEUE_* below 424 */ 425 unsigned long queue_flags; 426 /* 427 * Number of contexts that have called blk_set_pm_only(). If this 428 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are 429 * processed. 430 */ 431 atomic_t pm_only; 432 433 /* 434 * ida allocated id for this queue. Used to index queues from 435 * ioctx. 436 */ 437 int id; 438 439 /* 440 * queue needs bounce pages for pages above this limit 441 */ 442 gfp_t bounce_gfp; 443 444 spinlock_t queue_lock; 445 446 /* 447 * queue kobject 448 */ 449 struct kobject kobj; 450 451 /* 452 * mq queue kobject 453 */ 454 struct kobject *mq_kobj; 455 456 #ifdef CONFIG_BLK_DEV_INTEGRITY 457 struct blk_integrity integrity; 458 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 459 460 #ifdef CONFIG_PM 461 struct device *dev; 462 enum rpm_status rpm_status; 463 unsigned int nr_pending; 464 #endif 465 466 /* 467 * queue settings 468 */ 469 unsigned long nr_requests; /* Max # of requests */ 470 471 unsigned int dma_pad_mask; 472 unsigned int dma_alignment; 473 474 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 475 /* Inline crypto capabilities */ 476 struct blk_keyslot_manager *ksm; 477 #endif 478 479 unsigned int rq_timeout; 480 int poll_nsec; 481 482 struct blk_stat_callback *poll_cb; 483 struct blk_rq_stat poll_stat[BLK_MQ_POLL_STATS_BKTS]; 484 485 struct timer_list timeout; 486 struct work_struct timeout_work; 487 488 atomic_t nr_active_requests_shared_sbitmap; 489 490 struct list_head icq_list; 491 #ifdef CONFIG_BLK_CGROUP 492 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 493 struct blkcg_gq *root_blkg; 494 struct list_head blkg_list; 495 #endif 496 497 struct queue_limits limits; 498 499 unsigned int required_elevator_features; 500 501 #ifdef CONFIG_BLK_DEV_ZONED 502 /* 503 * Zoned block device information for request dispatch control. 504 * nr_zones is the total number of zones of the device. This is always 505 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 506 * bits which indicates if a zone is conventional (bit set) or 507 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 508 * bits which indicates if a zone is write locked, that is, if a write 509 * request targeting the zone was dispatched. All three fields are 510 * initialized by the low level device driver (e.g. scsi/sd.c). 511 * Stacking drivers (device mappers) may or may not initialize 512 * these fields. 513 * 514 * Reads of this information must be protected with blk_queue_enter() / 515 * blk_queue_exit(). Modifying this information is only allowed while 516 * no requests are being processed. See also blk_mq_freeze_queue() and 517 * blk_mq_unfreeze_queue(). 518 */ 519 unsigned int nr_zones; 520 unsigned long *conv_zones_bitmap; 521 unsigned long *seq_zones_wlock; 522 unsigned int max_open_zones; 523 unsigned int max_active_zones; 524 #endif /* CONFIG_BLK_DEV_ZONED */ 525 526 /* 527 * sg stuff 528 */ 529 unsigned int sg_timeout; 530 unsigned int sg_reserved_size; 531 int node; 532 struct mutex debugfs_mutex; 533 #ifdef CONFIG_BLK_DEV_IO_TRACE 534 struct blk_trace __rcu *blk_trace; 535 #endif 536 /* 537 * for flush operations 538 */ 539 struct blk_flush_queue *fq; 540 541 struct list_head requeue_list; 542 spinlock_t requeue_lock; 543 struct delayed_work requeue_work; 544 545 struct mutex sysfs_lock; 546 struct mutex sysfs_dir_lock; 547 548 /* 549 * for reusing dead hctx instance in case of updating 550 * nr_hw_queues 551 */ 552 struct list_head unused_hctx_list; 553 spinlock_t unused_hctx_lock; 554 555 int mq_freeze_depth; 556 557 #if defined(CONFIG_BLK_DEV_BSG) 558 struct bsg_class_device bsg_dev; 559 #endif 560 561 #ifdef CONFIG_BLK_DEV_THROTTLING 562 /* Throttle data */ 563 struct throtl_data *td; 564 #endif 565 struct rcu_head rcu_head; 566 wait_queue_head_t mq_freeze_wq; 567 /* 568 * Protect concurrent access to q_usage_counter by 569 * percpu_ref_kill() and percpu_ref_reinit(). 570 */ 571 struct mutex mq_freeze_lock; 572 struct percpu_ref q_usage_counter; 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 */ 623 624 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 625 (1 << QUEUE_FLAG_SAME_COMP)) 626 627 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 628 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 629 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 630 631 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 632 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 633 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 634 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 635 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 636 #define blk_queue_noxmerges(q) \ 637 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 638 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 639 #define blk_queue_stable_writes(q) \ 640 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 641 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 642 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 643 #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) 644 #define blk_queue_zone_resetall(q) \ 645 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 646 #define blk_queue_secure_erase(q) \ 647 (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) 648 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 649 #define blk_queue_scsi_passthrough(q) \ 650 test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) 651 #define blk_queue_pci_p2pdma(q) \ 652 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 653 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 654 #define blk_queue_rq_alloc_time(q) \ 655 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 656 #else 657 #define blk_queue_rq_alloc_time(q) false 658 #endif 659 660 #define blk_noretry_request(rq) \ 661 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 662 REQ_FAILFAST_DRIVER)) 663 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 664 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 665 #define blk_queue_fua(q) test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags) 666 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 667 668 extern void blk_set_pm_only(struct request_queue *q); 669 extern void blk_clear_pm_only(struct request_queue *q); 670 671 static inline bool blk_account_rq(struct request *rq) 672 { 673 return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq); 674 } 675 676 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 677 678 #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) 679 680 #define rq_dma_dir(rq) \ 681 (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) 682 683 #define dma_map_bvec(dev, bv, dir, attrs) \ 684 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 685 (dir), (attrs)) 686 687 static inline bool queue_is_mq(struct request_queue *q) 688 { 689 return q->mq_ops; 690 } 691 692 static inline enum blk_zoned_model 693 blk_queue_zoned_model(struct request_queue *q) 694 { 695 return q->limits.zoned; 696 } 697 698 static inline bool blk_queue_is_zoned(struct request_queue *q) 699 { 700 switch (blk_queue_zoned_model(q)) { 701 case BLK_ZONED_HA: 702 case BLK_ZONED_HM: 703 return true; 704 default: 705 return false; 706 } 707 } 708 709 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 710 { 711 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 712 } 713 714 #ifdef CONFIG_BLK_DEV_ZONED 715 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 716 { 717 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 718 } 719 720 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 721 sector_t sector) 722 { 723 if (!blk_queue_is_zoned(q)) 724 return 0; 725 return sector >> ilog2(q->limits.chunk_sectors); 726 } 727 728 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 729 sector_t sector) 730 { 731 if (!blk_queue_is_zoned(q)) 732 return false; 733 if (!q->conv_zones_bitmap) 734 return true; 735 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 736 } 737 738 static inline void blk_queue_max_open_zones(struct request_queue *q, 739 unsigned int max_open_zones) 740 { 741 q->max_open_zones = max_open_zones; 742 } 743 744 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 745 { 746 return q->max_open_zones; 747 } 748 749 static inline void blk_queue_max_active_zones(struct request_queue *q, 750 unsigned int max_active_zones) 751 { 752 q->max_active_zones = max_active_zones; 753 } 754 755 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 756 { 757 return q->max_active_zones; 758 } 759 #else /* CONFIG_BLK_DEV_ZONED */ 760 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 761 { 762 return 0; 763 } 764 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 765 sector_t sector) 766 { 767 return false; 768 } 769 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 770 sector_t sector) 771 { 772 return 0; 773 } 774 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 775 { 776 return 0; 777 } 778 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 779 { 780 return 0; 781 } 782 #endif /* CONFIG_BLK_DEV_ZONED */ 783 784 static inline bool rq_is_sync(struct request *rq) 785 { 786 return op_is_sync(rq->cmd_flags); 787 } 788 789 static inline bool rq_mergeable(struct request *rq) 790 { 791 if (blk_rq_is_passthrough(rq)) 792 return false; 793 794 if (req_op(rq) == REQ_OP_FLUSH) 795 return false; 796 797 if (req_op(rq) == REQ_OP_WRITE_ZEROES) 798 return false; 799 800 if (req_op(rq) == REQ_OP_ZONE_APPEND) 801 return false; 802 803 if (rq->cmd_flags & REQ_NOMERGE_FLAGS) 804 return false; 805 if (rq->rq_flags & RQF_NOMERGE_FLAGS) 806 return false; 807 808 return true; 809 } 810 811 static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b) 812 { 813 if (bio_page(a) == bio_page(b) && 814 bio_offset(a) == bio_offset(b)) 815 return true; 816 817 return false; 818 } 819 820 static inline unsigned int blk_queue_depth(struct request_queue *q) 821 { 822 if (q->queue_depth) 823 return q->queue_depth; 824 825 return q->nr_requests; 826 } 827 828 extern unsigned long blk_max_low_pfn, blk_max_pfn; 829 830 /* 831 * standard bounce addresses: 832 * 833 * BLK_BOUNCE_HIGH : bounce all highmem pages 834 * BLK_BOUNCE_ANY : don't bounce anything 835 * BLK_BOUNCE_ISA : bounce pages above ISA DMA boundary 836 */ 837 838 #if BITS_PER_LONG == 32 839 #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) 840 #else 841 #define BLK_BOUNCE_HIGH -1ULL 842 #endif 843 #define BLK_BOUNCE_ANY (-1ULL) 844 #define BLK_BOUNCE_ISA (DMA_BIT_MASK(24)) 845 846 /* 847 * default timeout for SG_IO if none specified 848 */ 849 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 850 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 851 852 struct rq_map_data { 853 struct page **pages; 854 int page_order; 855 int nr_entries; 856 unsigned long offset; 857 int null_mapped; 858 int from_user; 859 }; 860 861 struct req_iterator { 862 struct bvec_iter iter; 863 struct bio *bio; 864 }; 865 866 /* This should not be used directly - use rq_for_each_segment */ 867 #define for_each_bio(_bio) \ 868 for (; _bio; _bio = _bio->bi_next) 869 #define __rq_for_each_bio(_bio, rq) \ 870 if ((rq->bio)) \ 871 for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) 872 873 #define rq_for_each_segment(bvl, _rq, _iter) \ 874 __rq_for_each_bio(_iter.bio, _rq) \ 875 bio_for_each_segment(bvl, _iter.bio, _iter.iter) 876 877 #define rq_for_each_bvec(bvl, _rq, _iter) \ 878 __rq_for_each_bio(_iter.bio, _rq) \ 879 bio_for_each_bvec(bvl, _iter.bio, _iter.iter) 880 881 #define rq_iter_last(bvec, _iter) \ 882 (_iter.bio->bi_next == NULL && \ 883 bio_iter_last(bvec, _iter.iter)) 884 885 #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 886 # error "You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform" 887 #endif 888 #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 889 extern void rq_flush_dcache_pages(struct request *rq); 890 #else 891 static inline void rq_flush_dcache_pages(struct request *rq) 892 { 893 } 894 #endif 895 896 extern int blk_register_queue(struct gendisk *disk); 897 extern void blk_unregister_queue(struct gendisk *disk); 898 blk_qc_t submit_bio_noacct(struct bio *bio); 899 extern void blk_rq_init(struct request_queue *q, struct request *rq); 900 extern void blk_put_request(struct request *); 901 extern struct request *blk_get_request(struct request_queue *, unsigned int op, 902 blk_mq_req_flags_t flags); 903 extern int blk_lld_busy(struct request_queue *q); 904 extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src, 905 struct bio_set *bs, gfp_t gfp_mask, 906 int (*bio_ctr)(struct bio *, struct bio *, void *), 907 void *data); 908 extern void blk_rq_unprep_clone(struct request *rq); 909 extern blk_status_t blk_insert_cloned_request(struct request_queue *q, 910 struct request *rq); 911 extern int blk_rq_append_bio(struct request *rq, struct bio **bio); 912 extern void blk_queue_split(struct bio **); 913 extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int); 914 extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t, 915 unsigned int, void __user *); 916 extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, 917 unsigned int, void __user *); 918 extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, 919 struct scsi_ioctl_command __user *); 920 extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp); 921 extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp); 922 923 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 924 extern void blk_queue_exit(struct request_queue *q); 925 extern void blk_sync_queue(struct request_queue *q); 926 extern int blk_rq_map_user(struct request_queue *, struct request *, 927 struct rq_map_data *, void __user *, unsigned long, 928 gfp_t); 929 extern int blk_rq_unmap_user(struct bio *); 930 extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t); 931 extern int blk_rq_map_user_iov(struct request_queue *, struct request *, 932 struct rq_map_data *, const struct iov_iter *, 933 gfp_t); 934 extern void blk_execute_rq(struct request_queue *, struct gendisk *, 935 struct request *, int); 936 extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, 937 struct request *, int, rq_end_io_fn *); 938 939 /* Helper to convert REQ_OP_XXX to its string format XXX */ 940 extern const char *blk_op_str(unsigned int op); 941 942 int blk_status_to_errno(blk_status_t status); 943 blk_status_t errno_to_blk_status(int errno); 944 945 int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin); 946 947 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 948 { 949 return bdev->bd_disk->queue; /* this is never NULL */ 950 } 951 952 /* 953 * The basic unit of block I/O is a sector. It is used in a number of contexts 954 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9 955 * bytes. Variables of type sector_t represent an offset or size that is a 956 * multiple of 512 bytes. Hence these two constants. 957 */ 958 #ifndef SECTOR_SHIFT 959 #define SECTOR_SHIFT 9 960 #endif 961 #ifndef SECTOR_SIZE 962 #define SECTOR_SIZE (1 << SECTOR_SHIFT) 963 #endif 964 965 /* 966 * blk_rq_pos() : the current sector 967 * blk_rq_bytes() : bytes left in the entire request 968 * blk_rq_cur_bytes() : bytes left in the current segment 969 * blk_rq_err_bytes() : bytes left till the next error boundary 970 * blk_rq_sectors() : sectors left in the entire request 971 * blk_rq_cur_sectors() : sectors left in the current segment 972 * blk_rq_stats_sectors() : sectors of the entire request used for stats 973 */ 974 static inline sector_t blk_rq_pos(const struct request *rq) 975 { 976 return rq->__sector; 977 } 978 979 static inline unsigned int blk_rq_bytes(const struct request *rq) 980 { 981 return rq->__data_len; 982 } 983 984 static inline int blk_rq_cur_bytes(const struct request *rq) 985 { 986 return rq->bio ? bio_cur_bytes(rq->bio) : 0; 987 } 988 989 extern unsigned int blk_rq_err_bytes(const struct request *rq); 990 991 static inline unsigned int blk_rq_sectors(const struct request *rq) 992 { 993 return blk_rq_bytes(rq) >> SECTOR_SHIFT; 994 } 995 996 static inline unsigned int blk_rq_cur_sectors(const struct request *rq) 997 { 998 return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT; 999 } 1000 1001 static inline unsigned int blk_rq_stats_sectors(const struct request *rq) 1002 { 1003 return rq->stats_sectors; 1004 } 1005 1006 #ifdef CONFIG_BLK_DEV_ZONED 1007 1008 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 1009 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 1010 1011 static inline unsigned int blk_rq_zone_no(struct request *rq) 1012 { 1013 return blk_queue_zone_no(rq->q, blk_rq_pos(rq)); 1014 } 1015 1016 static inline unsigned int blk_rq_zone_is_seq(struct request *rq) 1017 { 1018 return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq)); 1019 } 1020 #endif /* CONFIG_BLK_DEV_ZONED */ 1021 1022 /* 1023 * Some commands like WRITE SAME have a payload or data transfer size which 1024 * is different from the size of the request. Any driver that supports such 1025 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to 1026 * calculate the data transfer size. 1027 */ 1028 static inline unsigned int blk_rq_payload_bytes(struct request *rq) 1029 { 1030 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1031 return rq->special_vec.bv_len; 1032 return blk_rq_bytes(rq); 1033 } 1034 1035 /* 1036 * Return the first full biovec in the request. The caller needs to check that 1037 * there are any bvecs before calling this helper. 1038 */ 1039 static inline struct bio_vec req_bvec(struct request *rq) 1040 { 1041 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1042 return rq->special_vec; 1043 return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter); 1044 } 1045 1046 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 1047 int op) 1048 { 1049 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 1050 return min(q->limits.max_discard_sectors, 1051 UINT_MAX >> SECTOR_SHIFT); 1052 1053 if (unlikely(op == REQ_OP_WRITE_SAME)) 1054 return q->limits.max_write_same_sectors; 1055 1056 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 1057 return q->limits.max_write_zeroes_sectors; 1058 1059 return q->limits.max_sectors; 1060 } 1061 1062 /* 1063 * Return maximum size of a request at given offset. Only valid for 1064 * file system requests. 1065 */ 1066 static inline unsigned int blk_max_size_offset(struct request_queue *q, 1067 sector_t offset) 1068 { 1069 unsigned int chunk_sectors = q->limits.chunk_sectors; 1070 1071 if (!chunk_sectors) 1072 return q->limits.max_sectors; 1073 1074 if (likely(is_power_of_2(chunk_sectors))) 1075 chunk_sectors -= offset & (chunk_sectors - 1); 1076 else 1077 chunk_sectors -= sector_div(offset, chunk_sectors); 1078 1079 return min(q->limits.max_sectors, chunk_sectors); 1080 } 1081 1082 static inline unsigned int blk_rq_get_max_sectors(struct request *rq, 1083 sector_t offset) 1084 { 1085 struct request_queue *q = rq->q; 1086 1087 if (blk_rq_is_passthrough(rq)) 1088 return q->limits.max_hw_sectors; 1089 1090 if (!q->limits.chunk_sectors || 1091 req_op(rq) == REQ_OP_DISCARD || 1092 req_op(rq) == REQ_OP_SECURE_ERASE) 1093 return blk_queue_get_max_sectors(q, req_op(rq)); 1094 1095 return min(blk_max_size_offset(q, offset), 1096 blk_queue_get_max_sectors(q, req_op(rq))); 1097 } 1098 1099 static inline unsigned int blk_rq_count_bios(struct request *rq) 1100 { 1101 unsigned int nr_bios = 0; 1102 struct bio *bio; 1103 1104 __rq_for_each_bio(bio, rq) 1105 nr_bios++; 1106 1107 return nr_bios; 1108 } 1109 1110 void blk_steal_bios(struct bio_list *list, struct request *rq); 1111 1112 /* 1113 * Request completion related functions. 1114 * 1115 * blk_update_request() completes given number of bytes and updates 1116 * the request without completing it. 1117 */ 1118 extern bool blk_update_request(struct request *rq, blk_status_t error, 1119 unsigned int nr_bytes); 1120 1121 extern void blk_abort_request(struct request *); 1122 1123 /* 1124 * Access functions for manipulating queue properties 1125 */ 1126 extern void blk_cleanup_queue(struct request_queue *); 1127 extern void blk_queue_bounce_limit(struct request_queue *, u64); 1128 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 1129 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 1130 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 1131 extern void blk_queue_max_discard_segments(struct request_queue *, 1132 unsigned short); 1133 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 1134 extern void blk_queue_max_discard_sectors(struct request_queue *q, 1135 unsigned int max_discard_sectors); 1136 extern void blk_queue_max_write_same_sectors(struct request_queue *q, 1137 unsigned int max_write_same_sectors); 1138 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 1139 unsigned int max_write_same_sectors); 1140 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 1141 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 1142 unsigned int max_zone_append_sectors); 1143 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 1144 extern void blk_queue_alignment_offset(struct request_queue *q, 1145 unsigned int alignment); 1146 void blk_queue_update_readahead(struct request_queue *q); 1147 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 1148 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 1149 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 1150 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 1151 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 1152 extern void blk_set_default_limits(struct queue_limits *lim); 1153 extern void blk_set_stacking_limits(struct queue_limits *lim); 1154 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1155 sector_t offset); 1156 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 1157 sector_t offset); 1158 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 1159 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 1160 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 1161 extern void blk_queue_dma_alignment(struct request_queue *, int); 1162 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 1163 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1164 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 1165 extern void blk_queue_required_elevator_features(struct request_queue *q, 1166 unsigned int features); 1167 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1168 struct device *dev); 1169 1170 /* 1171 * Number of physical segments as sent to the device. 1172 * 1173 * Normally this is the number of discontiguous data segments sent by the 1174 * submitter. But for data-less command like discard we might have no 1175 * actual data segments submitted, but the driver might have to add it's 1176 * own special payload. In that case we still return 1 here so that this 1177 * special payload will be mapped. 1178 */ 1179 static inline unsigned short blk_rq_nr_phys_segments(struct request *rq) 1180 { 1181 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD) 1182 return 1; 1183 return rq->nr_phys_segments; 1184 } 1185 1186 /* 1187 * Number of discard segments (or ranges) the driver needs to fill in. 1188 * Each discard bio merged into a request is counted as one segment. 1189 */ 1190 static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) 1191 { 1192 return max_t(unsigned short, rq->nr_phys_segments, 1); 1193 } 1194 1195 int __blk_rq_map_sg(struct request_queue *q, struct request *rq, 1196 struct scatterlist *sglist, struct scatterlist **last_sg); 1197 static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, 1198 struct scatterlist *sglist) 1199 { 1200 struct scatterlist *last_sg = NULL; 1201 1202 return __blk_rq_map_sg(q, rq, sglist, &last_sg); 1203 } 1204 extern void blk_dump_rq_flags(struct request *, char *); 1205 1206 bool __must_check blk_get_queue(struct request_queue *); 1207 struct request_queue *blk_alloc_queue(int node_id); 1208 extern void blk_put_queue(struct request_queue *); 1209 extern void blk_set_queue_dying(struct request_queue *); 1210 1211 #ifdef CONFIG_BLOCK 1212 /* 1213 * blk_plug permits building a queue of related requests by holding the I/O 1214 * fragments for a short period. This allows merging of sequential requests 1215 * into single larger request. As the requests are moved from a per-task list to 1216 * the device's request_queue in a batch, this results in improved scalability 1217 * as the lock contention for request_queue lock is reduced. 1218 * 1219 * It is ok not to disable preemption when adding the request to the plug list 1220 * or when attempting a merge, because blk_schedule_flush_list() will only flush 1221 * the plug list when the task sleeps by itself. For details, please see 1222 * schedule() where blk_schedule_flush_plug() is called. 1223 */ 1224 struct blk_plug { 1225 struct list_head mq_list; /* blk-mq requests */ 1226 struct list_head cb_list; /* md requires an unplug callback */ 1227 unsigned short rq_count; 1228 bool multiple_queues; 1229 bool nowait; 1230 }; 1231 #define BLK_MAX_REQUEST_COUNT 16 1232 #define BLK_PLUG_FLUSH_SIZE (128 * 1024) 1233 1234 struct blk_plug_cb; 1235 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1236 struct blk_plug_cb { 1237 struct list_head list; 1238 blk_plug_cb_fn callback; 1239 void *data; 1240 }; 1241 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1242 void *data, int size); 1243 extern void blk_start_plug(struct blk_plug *); 1244 extern void blk_finish_plug(struct blk_plug *); 1245 extern void blk_flush_plug_list(struct blk_plug *, bool); 1246 1247 static inline void blk_flush_plug(struct task_struct *tsk) 1248 { 1249 struct blk_plug *plug = tsk->plug; 1250 1251 if (plug) 1252 blk_flush_plug_list(plug, false); 1253 } 1254 1255 static inline void blk_schedule_flush_plug(struct task_struct *tsk) 1256 { 1257 struct blk_plug *plug = tsk->plug; 1258 1259 if (plug) 1260 blk_flush_plug_list(plug, true); 1261 } 1262 1263 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1264 { 1265 struct blk_plug *plug = tsk->plug; 1266 1267 return plug && 1268 (!list_empty(&plug->mq_list) || 1269 !list_empty(&plug->cb_list)); 1270 } 1271 1272 int blkdev_issue_flush(struct block_device *, gfp_t); 1273 long nr_blockdev_pages(void); 1274 #else /* CONFIG_BLOCK */ 1275 struct blk_plug { 1276 }; 1277 1278 static inline void blk_start_plug(struct blk_plug *plug) 1279 { 1280 } 1281 1282 static inline void blk_finish_plug(struct blk_plug *plug) 1283 { 1284 } 1285 1286 static inline void blk_flush_plug(struct task_struct *task) 1287 { 1288 } 1289 1290 static inline void blk_schedule_flush_plug(struct task_struct *task) 1291 { 1292 } 1293 1294 1295 static inline bool blk_needs_flush_plug(struct task_struct *tsk) 1296 { 1297 return false; 1298 } 1299 1300 static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask) 1301 { 1302 return 0; 1303 } 1304 1305 static inline long nr_blockdev_pages(void) 1306 { 1307 return 0; 1308 } 1309 #endif /* CONFIG_BLOCK */ 1310 1311 extern void blk_io_schedule(void); 1312 1313 extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector, 1314 sector_t nr_sects, gfp_t gfp_mask, struct page *page); 1315 1316 #define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */ 1317 1318 extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1319 sector_t nr_sects, gfp_t gfp_mask, unsigned long flags); 1320 extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1321 sector_t nr_sects, gfp_t gfp_mask, int flags, 1322 struct bio **biop); 1323 1324 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1325 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1326 1327 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1328 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1329 unsigned flags); 1330 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1331 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1332 1333 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1334 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1335 { 1336 return blkdev_issue_discard(sb->s_bdev, 1337 block << (sb->s_blocksize_bits - 1338 SECTOR_SHIFT), 1339 nr_blocks << (sb->s_blocksize_bits - 1340 SECTOR_SHIFT), 1341 gfp_mask, flags); 1342 } 1343 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1344 sector_t nr_blocks, gfp_t gfp_mask) 1345 { 1346 return blkdev_issue_zeroout(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, 0); 1352 } 1353 1354 extern int blk_verify_command(unsigned char *cmd, fmode_t mode); 1355 1356 enum blk_default_limits { 1357 BLK_MAX_SEGMENTS = 128, 1358 BLK_SAFE_MAX_SECTORS = 255, 1359 BLK_DEF_MAX_SECTORS = 2560, 1360 BLK_MAX_SEGMENT_SIZE = 65536, 1361 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1362 }; 1363 1364 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1365 { 1366 return q->limits.seg_boundary_mask; 1367 } 1368 1369 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1370 { 1371 return q->limits.virt_boundary_mask; 1372 } 1373 1374 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1375 { 1376 return q->limits.max_sectors; 1377 } 1378 1379 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1380 { 1381 return q->limits.max_hw_sectors; 1382 } 1383 1384 static inline unsigned short queue_max_segments(const struct request_queue *q) 1385 { 1386 return q->limits.max_segments; 1387 } 1388 1389 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1390 { 1391 return q->limits.max_discard_segments; 1392 } 1393 1394 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1395 { 1396 return q->limits.max_segment_size; 1397 } 1398 1399 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1400 { 1401 return q->limits.max_zone_append_sectors; 1402 } 1403 1404 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1405 { 1406 int retval = 512; 1407 1408 if (q && q->limits.logical_block_size) 1409 retval = q->limits.logical_block_size; 1410 1411 return retval; 1412 } 1413 1414 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1415 { 1416 return queue_logical_block_size(bdev_get_queue(bdev)); 1417 } 1418 1419 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1420 { 1421 return q->limits.physical_block_size; 1422 } 1423 1424 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1425 { 1426 return queue_physical_block_size(bdev_get_queue(bdev)); 1427 } 1428 1429 static inline unsigned int queue_io_min(const struct request_queue *q) 1430 { 1431 return q->limits.io_min; 1432 } 1433 1434 static inline int bdev_io_min(struct block_device *bdev) 1435 { 1436 return queue_io_min(bdev_get_queue(bdev)); 1437 } 1438 1439 static inline unsigned int queue_io_opt(const struct request_queue *q) 1440 { 1441 return q->limits.io_opt; 1442 } 1443 1444 static inline int bdev_io_opt(struct block_device *bdev) 1445 { 1446 return queue_io_opt(bdev_get_queue(bdev)); 1447 } 1448 1449 static inline int queue_alignment_offset(const struct request_queue *q) 1450 { 1451 if (q->limits.misaligned) 1452 return -1; 1453 1454 return q->limits.alignment_offset; 1455 } 1456 1457 static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector) 1458 { 1459 unsigned int granularity = max(lim->physical_block_size, lim->io_min); 1460 unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT) 1461 << SECTOR_SHIFT; 1462 1463 return (granularity + lim->alignment_offset - alignment) % granularity; 1464 } 1465 1466 static inline int bdev_alignment_offset(struct block_device *bdev) 1467 { 1468 struct request_queue *q = bdev_get_queue(bdev); 1469 1470 if (q->limits.misaligned) 1471 return -1; 1472 if (bdev != bdev->bd_contains) 1473 return queue_limit_alignment_offset(&q->limits, 1474 bdev->bd_part->start_sect); 1475 return q->limits.alignment_offset; 1476 } 1477 1478 static inline int queue_discard_alignment(const struct request_queue *q) 1479 { 1480 if (q->limits.discard_misaligned) 1481 return -1; 1482 1483 return q->limits.discard_alignment; 1484 } 1485 1486 static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector) 1487 { 1488 unsigned int alignment, granularity, offset; 1489 1490 if (!lim->max_discard_sectors) 1491 return 0; 1492 1493 /* Why are these in bytes, not sectors? */ 1494 alignment = lim->discard_alignment >> SECTOR_SHIFT; 1495 granularity = lim->discard_granularity >> SECTOR_SHIFT; 1496 if (!granularity) 1497 return 0; 1498 1499 /* Offset of the partition start in 'granularity' sectors */ 1500 offset = sector_div(sector, granularity); 1501 1502 /* And why do we do this modulus *again* in blkdev_issue_discard()? */ 1503 offset = (granularity + alignment - offset) % granularity; 1504 1505 /* Turn it back into bytes, gaah */ 1506 return offset << SECTOR_SHIFT; 1507 } 1508 1509 static inline int bdev_discard_alignment(struct block_device *bdev) 1510 { 1511 struct request_queue *q = bdev_get_queue(bdev); 1512 1513 if (bdev != bdev->bd_contains) 1514 return queue_limit_discard_alignment(&q->limits, 1515 bdev->bd_part->start_sect); 1516 return q->limits.discard_alignment; 1517 } 1518 1519 static inline unsigned int bdev_write_same(struct block_device *bdev) 1520 { 1521 struct request_queue *q = bdev_get_queue(bdev); 1522 1523 if (q) 1524 return q->limits.max_write_same_sectors; 1525 1526 return 0; 1527 } 1528 1529 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1530 { 1531 struct request_queue *q = bdev_get_queue(bdev); 1532 1533 if (q) 1534 return q->limits.max_write_zeroes_sectors; 1535 1536 return 0; 1537 } 1538 1539 static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1540 { 1541 struct request_queue *q = bdev_get_queue(bdev); 1542 1543 if (q) 1544 return blk_queue_zoned_model(q); 1545 1546 return BLK_ZONED_NONE; 1547 } 1548 1549 static inline bool bdev_is_zoned(struct block_device *bdev) 1550 { 1551 struct request_queue *q = bdev_get_queue(bdev); 1552 1553 if (q) 1554 return blk_queue_is_zoned(q); 1555 1556 return false; 1557 } 1558 1559 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1560 { 1561 struct request_queue *q = bdev_get_queue(bdev); 1562 1563 if (q) 1564 return blk_queue_zone_sectors(q); 1565 return 0; 1566 } 1567 1568 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1569 { 1570 struct request_queue *q = bdev_get_queue(bdev); 1571 1572 if (q) 1573 return queue_max_open_zones(q); 1574 return 0; 1575 } 1576 1577 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1578 { 1579 struct request_queue *q = bdev_get_queue(bdev); 1580 1581 if (q) 1582 return queue_max_active_zones(q); 1583 return 0; 1584 } 1585 1586 static inline int queue_dma_alignment(const struct request_queue *q) 1587 { 1588 return q ? q->dma_alignment : 511; 1589 } 1590 1591 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1592 unsigned int len) 1593 { 1594 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1595 return !(addr & alignment) && !(len & alignment); 1596 } 1597 1598 /* assumes size > 256 */ 1599 static inline unsigned int blksize_bits(unsigned int size) 1600 { 1601 unsigned int bits = 8; 1602 do { 1603 bits++; 1604 size >>= 1; 1605 } while (size > 256); 1606 return bits; 1607 } 1608 1609 static inline unsigned int block_size(struct block_device *bdev) 1610 { 1611 return 1 << bdev->bd_inode->i_blkbits; 1612 } 1613 1614 int kblockd_schedule_work(struct work_struct *work); 1615 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1616 1617 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1618 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1619 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1620 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1621 1622 #if defined(CONFIG_BLK_DEV_INTEGRITY) 1623 1624 enum blk_integrity_flags { 1625 BLK_INTEGRITY_VERIFY = 1 << 0, 1626 BLK_INTEGRITY_GENERATE = 1 << 1, 1627 BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2, 1628 BLK_INTEGRITY_IP_CHECKSUM = 1 << 3, 1629 }; 1630 1631 struct blk_integrity_iter { 1632 void *prot_buf; 1633 void *data_buf; 1634 sector_t seed; 1635 unsigned int data_size; 1636 unsigned short interval; 1637 const char *disk_name; 1638 }; 1639 1640 typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *); 1641 typedef void (integrity_prepare_fn) (struct request *); 1642 typedef void (integrity_complete_fn) (struct request *, unsigned int); 1643 1644 struct blk_integrity_profile { 1645 integrity_processing_fn *generate_fn; 1646 integrity_processing_fn *verify_fn; 1647 integrity_prepare_fn *prepare_fn; 1648 integrity_complete_fn *complete_fn; 1649 const char *name; 1650 }; 1651 1652 extern void blk_integrity_register(struct gendisk *, struct blk_integrity *); 1653 extern void blk_integrity_unregister(struct gendisk *); 1654 extern int blk_integrity_compare(struct gendisk *, struct gendisk *); 1655 extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *, 1656 struct scatterlist *); 1657 extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *); 1658 extern bool blk_integrity_merge_rq(struct request_queue *, struct request *, 1659 struct request *); 1660 extern bool blk_integrity_merge_bio(struct request_queue *, struct request *, 1661 struct bio *); 1662 1663 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1664 { 1665 struct blk_integrity *bi = &disk->queue->integrity; 1666 1667 if (!bi->profile) 1668 return NULL; 1669 1670 return bi; 1671 } 1672 1673 static inline 1674 struct blk_integrity *bdev_get_integrity(struct block_device *bdev) 1675 { 1676 return blk_get_integrity(bdev->bd_disk); 1677 } 1678 1679 static inline bool 1680 blk_integrity_queue_supports_integrity(struct request_queue *q) 1681 { 1682 return q->integrity.profile; 1683 } 1684 1685 static inline bool blk_integrity_rq(struct request *rq) 1686 { 1687 return rq->cmd_flags & REQ_INTEGRITY; 1688 } 1689 1690 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1691 unsigned int segs) 1692 { 1693 q->limits.max_integrity_segments = segs; 1694 } 1695 1696 static inline unsigned short 1697 queue_max_integrity_segments(const struct request_queue *q) 1698 { 1699 return q->limits.max_integrity_segments; 1700 } 1701 1702 /** 1703 * bio_integrity_intervals - Return number of integrity intervals for a bio 1704 * @bi: blk_integrity profile for device 1705 * @sectors: Size of the bio in 512-byte sectors 1706 * 1707 * Description: The block layer calculates everything in 512 byte 1708 * sectors but integrity metadata is done in terms of the data integrity 1709 * interval size of the storage device. Convert the block layer sectors 1710 * to the appropriate number of integrity intervals. 1711 */ 1712 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1713 unsigned int sectors) 1714 { 1715 return sectors >> (bi->interval_exp - 9); 1716 } 1717 1718 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1719 unsigned int sectors) 1720 { 1721 return bio_integrity_intervals(bi, sectors) * bi->tuple_size; 1722 } 1723 1724 /* 1725 * Return the first bvec that contains integrity data. Only drivers that are 1726 * limited to a single integrity segment should use this helper. 1727 */ 1728 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1729 { 1730 if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) 1731 return NULL; 1732 return rq->bio->bi_integrity->bip_vec; 1733 } 1734 1735 #else /* CONFIG_BLK_DEV_INTEGRITY */ 1736 1737 struct bio; 1738 struct block_device; 1739 struct gendisk; 1740 struct blk_integrity; 1741 1742 static inline int blk_integrity_rq(struct request *rq) 1743 { 1744 return 0; 1745 } 1746 static inline int blk_rq_count_integrity_sg(struct request_queue *q, 1747 struct bio *b) 1748 { 1749 return 0; 1750 } 1751 static inline int blk_rq_map_integrity_sg(struct request_queue *q, 1752 struct bio *b, 1753 struct scatterlist *s) 1754 { 1755 return 0; 1756 } 1757 static inline struct blk_integrity *bdev_get_integrity(struct block_device *b) 1758 { 1759 return NULL; 1760 } 1761 static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) 1762 { 1763 return NULL; 1764 } 1765 static inline bool 1766 blk_integrity_queue_supports_integrity(struct request_queue *q) 1767 { 1768 return false; 1769 } 1770 static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b) 1771 { 1772 return 0; 1773 } 1774 static inline void blk_integrity_register(struct gendisk *d, 1775 struct blk_integrity *b) 1776 { 1777 } 1778 static inline void blk_integrity_unregister(struct gendisk *d) 1779 { 1780 } 1781 static inline void blk_queue_max_integrity_segments(struct request_queue *q, 1782 unsigned int segs) 1783 { 1784 } 1785 static inline unsigned short queue_max_integrity_segments(const struct request_queue *q) 1786 { 1787 return 0; 1788 } 1789 static inline bool blk_integrity_merge_rq(struct request_queue *rq, 1790 struct request *r1, 1791 struct request *r2) 1792 { 1793 return true; 1794 } 1795 static inline bool blk_integrity_merge_bio(struct request_queue *rq, 1796 struct request *r, 1797 struct bio *b) 1798 { 1799 return true; 1800 } 1801 1802 static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi, 1803 unsigned int sectors) 1804 { 1805 return 0; 1806 } 1807 1808 static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi, 1809 unsigned int sectors) 1810 { 1811 return 0; 1812 } 1813 1814 static inline struct bio_vec *rq_integrity_vec(struct request *rq) 1815 { 1816 return NULL; 1817 } 1818 1819 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 1820 1821 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1822 1823 bool blk_ksm_register(struct blk_keyslot_manager *ksm, struct request_queue *q); 1824 1825 void blk_ksm_unregister(struct request_queue *q); 1826 1827 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1828 1829 static inline bool blk_ksm_register(struct blk_keyslot_manager *ksm, 1830 struct request_queue *q) 1831 { 1832 return true; 1833 } 1834 1835 static inline void blk_ksm_unregister(struct request_queue *q) { } 1836 1837 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1838 1839 1840 struct block_device_operations { 1841 blk_qc_t (*submit_bio) (struct bio *bio); 1842 int (*open) (struct block_device *, fmode_t); 1843 void (*release) (struct gendisk *, fmode_t); 1844 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1845 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1846 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1847 unsigned int (*check_events) (struct gendisk *disk, 1848 unsigned int clearing); 1849 void (*unlock_native_capacity) (struct gendisk *); 1850 int (*revalidate_disk) (struct gendisk *); 1851 int (*getgeo)(struct block_device *, struct hd_geometry *); 1852 /* this callback is with swap_lock and sometimes page table lock held */ 1853 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1854 int (*report_zones)(struct gendisk *, sector_t sector, 1855 unsigned int nr_zones, report_zones_cb cb, void *data); 1856 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1857 struct module *owner; 1858 const struct pr_ops *pr_ops; 1859 }; 1860 1861 #ifdef CONFIG_COMPAT 1862 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1863 unsigned int, unsigned long); 1864 #else 1865 #define blkdev_compat_ptr_ioctl NULL 1866 #endif 1867 1868 extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, 1869 unsigned long); 1870 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1871 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1872 struct writeback_control *); 1873 1874 #ifdef CONFIG_BLK_DEV_ZONED 1875 bool blk_req_needs_zone_write_lock(struct request *rq); 1876 bool blk_req_zone_write_trylock(struct request *rq); 1877 void __blk_req_zone_write_lock(struct request *rq); 1878 void __blk_req_zone_write_unlock(struct request *rq); 1879 1880 static inline void blk_req_zone_write_lock(struct request *rq) 1881 { 1882 if (blk_req_needs_zone_write_lock(rq)) 1883 __blk_req_zone_write_lock(rq); 1884 } 1885 1886 static inline void blk_req_zone_write_unlock(struct request *rq) 1887 { 1888 if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED) 1889 __blk_req_zone_write_unlock(rq); 1890 } 1891 1892 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1893 { 1894 return rq->q->seq_zones_wlock && 1895 test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock); 1896 } 1897 1898 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1899 { 1900 if (!blk_req_needs_zone_write_lock(rq)) 1901 return true; 1902 return !blk_req_zone_is_write_locked(rq); 1903 } 1904 #else 1905 static inline bool blk_req_needs_zone_write_lock(struct request *rq) 1906 { 1907 return false; 1908 } 1909 1910 static inline void blk_req_zone_write_lock(struct request *rq) 1911 { 1912 } 1913 1914 static inline void blk_req_zone_write_unlock(struct request *rq) 1915 { 1916 } 1917 static inline bool blk_req_zone_is_write_locked(struct request *rq) 1918 { 1919 return false; 1920 } 1921 1922 static inline bool blk_req_can_dispatch_to_zone(struct request *rq) 1923 { 1924 return true; 1925 } 1926 #endif /* CONFIG_BLK_DEV_ZONED */ 1927 1928 static inline void blk_wake_io_task(struct task_struct *waiter) 1929 { 1930 /* 1931 * If we're polling, the task itself is doing the completions. For 1932 * that case, we don't need to signal a wakeup, it's enough to just 1933 * mark us as RUNNING. 1934 */ 1935 if (waiter == current) 1936 __set_current_state(TASK_RUNNING); 1937 else 1938 wake_up_process(waiter); 1939 } 1940 1941 unsigned long disk_start_io_acct(struct gendisk *disk, unsigned int sectors, 1942 unsigned int op); 1943 void disk_end_io_acct(struct gendisk *disk, unsigned int op, 1944 unsigned long start_time); 1945 1946 unsigned long part_start_io_acct(struct gendisk *disk, struct hd_struct **part, 1947 struct bio *bio); 1948 void part_end_io_acct(struct hd_struct *part, struct bio *bio, 1949 unsigned long start_time); 1950 1951 /** 1952 * bio_start_io_acct - start I/O accounting for bio based drivers 1953 * @bio: bio to start account for 1954 * 1955 * Returns the start time that should be passed back to bio_end_io_acct(). 1956 */ 1957 static inline unsigned long bio_start_io_acct(struct bio *bio) 1958 { 1959 return disk_start_io_acct(bio->bi_disk, bio_sectors(bio), bio_op(bio)); 1960 } 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 disk_end_io_acct(bio->bi_disk, bio_op(bio), start_time); 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 struct block_device *lookup_bdev(const char *); 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, struct block_device *whole, 1992 void *holder); 1993 void bd_abort_claiming(struct block_device *bdev, struct block_device *whole, 1994 void *holder); 1995 void blkdev_put(struct block_device *bdev, fmode_t mode); 1996 1997 struct block_device *I_BDEV(struct inode *inode); 1998 struct block_device *bdget(dev_t); 1999 struct block_device *bdgrab(struct block_device *bdev); 2000 void bdput(struct block_device *); 2001 2002 #ifdef CONFIG_BLOCK 2003 void invalidate_bdev(struct block_device *bdev); 2004 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 2005 loff_t lend); 2006 int sync_blockdev(struct block_device *bdev); 2007 #else 2008 static inline void invalidate_bdev(struct block_device *bdev) 2009 { 2010 } 2011 static inline int truncate_bdev_range(struct block_device *bdev, fmode_t mode, 2012 loff_t lstart, loff_t lend) 2013 { 2014 return 0; 2015 } 2016 static inline int sync_blockdev(struct block_device *bdev) 2017 { 2018 return 0; 2019 } 2020 #endif 2021 int fsync_bdev(struct block_device *bdev); 2022 2023 struct super_block *freeze_bdev(struct block_device *bdev); 2024 int thaw_bdev(struct block_device *bdev, struct super_block *sb); 2025 2026 #endif /* _LINUX_BLKDEV_H */ 2027