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