1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Portions Copyright (C) 1992 Drew Eckhardt 4 */ 5 #ifndef _LINUX_BLKDEV_H 6 #define _LINUX_BLKDEV_H 7 8 #include <linux/types.h> 9 #include <linux/blk_types.h> 10 #include <linux/device.h> 11 #include <linux/list.h> 12 #include <linux/llist.h> 13 #include <linux/minmax.h> 14 #include <linux/timer.h> 15 #include <linux/workqueue.h> 16 #include <linux/wait.h> 17 #include <linux/bio.h> 18 #include <linux/gfp.h> 19 #include <linux/kdev_t.h> 20 #include <linux/rcupdate.h> 21 #include <linux/percpu-refcount.h> 22 #include <linux/blkzoned.h> 23 #include <linux/sched.h> 24 #include <linux/sbitmap.h> 25 #include <linux/uuid.h> 26 #include <linux/xarray.h> 27 #include <linux/file.h> 28 #include <linux/lockdep.h> 29 30 struct module; 31 struct request_queue; 32 struct elevator_queue; 33 struct blk_trace; 34 struct request; 35 struct sg_io_hdr; 36 struct blkcg_gq; 37 struct blk_flush_queue; 38 struct kiocb; 39 struct pr_ops; 40 struct rq_qos; 41 struct blk_queue_stats; 42 struct blk_stat_callback; 43 struct blk_crypto_profile; 44 45 extern const struct device_type disk_type; 46 extern const struct device_type part_type; 47 extern const struct class block_class; 48 49 /* 50 * Maximum number of blkcg policies allowed to be registered concurrently. 51 * Defined here to simplify include dependency. 52 */ 53 #define BLKCG_MAX_POLS 6 54 55 #define DISK_MAX_PARTS 256 56 #define DISK_NAME_LEN 32 57 58 #define PARTITION_META_INFO_VOLNAMELTH 64 59 /* 60 * Enough for the string representation of any kind of UUID plus NULL. 61 * EFI UUID is 36 characters. MSDOS UUID is 11 characters. 62 */ 63 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) 64 65 struct partition_meta_info { 66 char uuid[PARTITION_META_INFO_UUIDLTH]; 67 u8 volname[PARTITION_META_INFO_VOLNAMELTH]; 68 }; 69 70 /** 71 * DOC: genhd capability flags 72 * 73 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to 74 * removable media. When set, the device remains present even when media is not 75 * inserted. Shall not be set for devices which are removed entirely when the 76 * media is removed. 77 * 78 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events, 79 * doesn't appear in sysfs, and can't be opened from userspace or using 80 * blkdev_get*. Used for the underlying components of multipath devices. 81 * 82 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not 83 * scan for partitions from add_disk, and users can't add partitions manually. 84 * 85 */ 86 enum { 87 GENHD_FL_REMOVABLE = 1 << 0, 88 GENHD_FL_HIDDEN = 1 << 1, 89 GENHD_FL_NO_PART = 1 << 2, 90 }; 91 92 enum { 93 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ 94 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ 95 }; 96 97 enum { 98 /* Poll even if events_poll_msecs is unset */ 99 DISK_EVENT_FLAG_POLL = 1 << 0, 100 /* Forward events to udev */ 101 DISK_EVENT_FLAG_UEVENT = 1 << 1, 102 /* Block event polling when open for exclusive write */ 103 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2, 104 }; 105 106 struct disk_events; 107 struct badblocks; 108 109 enum blk_integrity_checksum { 110 BLK_INTEGRITY_CSUM_NONE = 0, 111 BLK_INTEGRITY_CSUM_IP = 1, 112 BLK_INTEGRITY_CSUM_CRC = 2, 113 BLK_INTEGRITY_CSUM_CRC64 = 3, 114 } __packed ; 115 116 struct blk_integrity { 117 unsigned char flags; 118 enum blk_integrity_checksum csum_type; 119 unsigned char tuple_size; 120 unsigned char pi_offset; 121 unsigned char interval_exp; 122 unsigned char tag_size; 123 }; 124 125 typedef unsigned int __bitwise blk_mode_t; 126 127 /* open for reading */ 128 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0)) 129 /* open for writing */ 130 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1)) 131 /* open exclusively (vs other exclusive openers */ 132 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2)) 133 /* opened with O_NDELAY */ 134 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3)) 135 /* open for "writes" only for ioctls (specialy hack for floppy.c) */ 136 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4)) 137 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */ 138 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5)) 139 /* return partition scanning errors */ 140 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6)) 141 142 struct gendisk { 143 /* 144 * major/first_minor/minors should not be set by any new driver, the 145 * block core will take care of allocating them automatically. 146 */ 147 int major; 148 int first_minor; 149 int minors; 150 151 char disk_name[DISK_NAME_LEN]; /* name of major driver */ 152 153 unsigned short events; /* supported events */ 154 unsigned short event_flags; /* flags related to event processing */ 155 156 struct xarray part_tbl; 157 struct block_device *part0; 158 159 const struct block_device_operations *fops; 160 struct request_queue *queue; 161 void *private_data; 162 163 struct bio_set bio_split; 164 165 int flags; 166 unsigned long state; 167 #define GD_NEED_PART_SCAN 0 168 #define GD_READ_ONLY 1 169 #define GD_DEAD 2 170 #define GD_NATIVE_CAPACITY 3 171 #define GD_ADDED 4 172 #define GD_SUPPRESS_PART_SCAN 5 173 #define GD_OWNS_QUEUE 6 174 175 struct mutex open_mutex; /* open/close mutex */ 176 unsigned open_partitions; /* number of open partitions */ 177 178 struct backing_dev_info *bdi; 179 struct kobject queue_kobj; /* the queue/ directory */ 180 struct kobject *slave_dir; 181 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 182 struct list_head slave_bdevs; 183 #endif 184 struct timer_rand_state *random; 185 atomic_t sync_io; /* RAID */ 186 struct disk_events *ev; 187 188 #ifdef CONFIG_BLK_DEV_ZONED 189 /* 190 * Zoned block device information. Reads of this information must be 191 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this 192 * information is only allowed while no requests are being processed. 193 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue(). 194 */ 195 unsigned int nr_zones; 196 unsigned int zone_capacity; 197 unsigned int last_zone_capacity; 198 unsigned long __rcu *conv_zones_bitmap; 199 unsigned int zone_wplugs_hash_bits; 200 spinlock_t zone_wplugs_lock; 201 struct mempool_s *zone_wplugs_pool; 202 struct hlist_head *zone_wplugs_hash; 203 struct workqueue_struct *zone_wplugs_wq; 204 #endif /* CONFIG_BLK_DEV_ZONED */ 205 206 #if IS_ENABLED(CONFIG_CDROM) 207 struct cdrom_device_info *cdi; 208 #endif 209 int node_id; 210 struct badblocks *bb; 211 struct lockdep_map lockdep_map; 212 u64 diskseq; 213 blk_mode_t open_mode; 214 215 /* 216 * Independent sector access ranges. This is always NULL for 217 * devices that do not have multiple independent access ranges. 218 */ 219 struct blk_independent_access_ranges *ia_ranges; 220 }; 221 222 /** 223 * disk_openers - returns how many openers are there for a disk 224 * @disk: disk to check 225 * 226 * This returns the number of openers for a disk. Note that this value is only 227 * stable if disk->open_mutex is held. 228 * 229 * Note: Due to a quirk in the block layer open code, each open partition is 230 * only counted once even if there are multiple openers. 231 */ 232 static inline unsigned int disk_openers(struct gendisk *disk) 233 { 234 return atomic_read(&disk->part0->bd_openers); 235 } 236 237 /** 238 * disk_has_partscan - return %true if partition scanning is enabled on a disk 239 * @disk: disk to check 240 * 241 * Returns %true if partitions scanning is enabled for @disk, or %false if 242 * partition scanning is disabled either permanently or temporarily. 243 */ 244 static inline bool disk_has_partscan(struct gendisk *disk) 245 { 246 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) && 247 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state); 248 } 249 250 /* 251 * The gendisk is refcounted by the part0 block_device, and the bd_device 252 * therein is also used for device model presentation in sysfs. 253 */ 254 #define dev_to_disk(device) \ 255 (dev_to_bdev(device)->bd_disk) 256 #define disk_to_dev(disk) \ 257 (&((disk)->part0->bd_device)) 258 259 #if IS_REACHABLE(CONFIG_CDROM) 260 #define disk_to_cdi(disk) ((disk)->cdi) 261 #else 262 #define disk_to_cdi(disk) NULL 263 #endif 264 265 static inline dev_t disk_devt(struct gendisk *disk) 266 { 267 return MKDEV(disk->major, disk->first_minor); 268 } 269 270 /* blk_validate_limits() validates bsize, so drivers don't usually need to */ 271 static inline int blk_validate_block_size(unsigned long bsize) 272 { 273 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) 274 return -EINVAL; 275 276 return 0; 277 } 278 279 static inline bool blk_op_is_passthrough(blk_opf_t op) 280 { 281 op &= REQ_OP_MASK; 282 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 283 } 284 285 /* flags set by the driver in queue_limits.features */ 286 typedef unsigned int __bitwise blk_features_t; 287 288 /* supports a volatile write cache */ 289 #define BLK_FEAT_WRITE_CACHE ((__force blk_features_t)(1u << 0)) 290 291 /* supports passing on the FUA bit */ 292 #define BLK_FEAT_FUA ((__force blk_features_t)(1u << 1)) 293 294 /* rotational device (hard drive or floppy) */ 295 #define BLK_FEAT_ROTATIONAL ((__force blk_features_t)(1u << 2)) 296 297 /* contributes to the random number pool */ 298 #define BLK_FEAT_ADD_RANDOM ((__force blk_features_t)(1u << 3)) 299 300 /* do disk/partitions IO accounting */ 301 #define BLK_FEAT_IO_STAT ((__force blk_features_t)(1u << 4)) 302 303 /* don't modify data until writeback is done */ 304 #define BLK_FEAT_STABLE_WRITES ((__force blk_features_t)(1u << 5)) 305 306 /* always completes in submit context */ 307 #define BLK_FEAT_SYNCHRONOUS ((__force blk_features_t)(1u << 6)) 308 309 /* supports REQ_NOWAIT */ 310 #define BLK_FEAT_NOWAIT ((__force blk_features_t)(1u << 7)) 311 312 /* supports DAX */ 313 #define BLK_FEAT_DAX ((__force blk_features_t)(1u << 8)) 314 315 /* supports I/O polling */ 316 #define BLK_FEAT_POLL ((__force blk_features_t)(1u << 9)) 317 318 /* is a zoned device */ 319 #define BLK_FEAT_ZONED ((__force blk_features_t)(1u << 10)) 320 321 /* supports PCI(e) p2p requests */ 322 #define BLK_FEAT_PCI_P2PDMA ((__force blk_features_t)(1u << 12)) 323 324 /* skip this queue in blk_mq_(un)quiesce_tagset */ 325 #define BLK_FEAT_SKIP_TAGSET_QUIESCE ((__force blk_features_t)(1u << 13)) 326 327 /* bounce all highmem pages */ 328 #define BLK_FEAT_BOUNCE_HIGH ((__force blk_features_t)(1u << 14)) 329 330 /* undocumented magic for bcache */ 331 #define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE \ 332 ((__force blk_features_t)(1u << 15)) 333 334 /* stacked device can/does support atomic writes */ 335 #define BLK_FEAT_ATOMIC_WRITES_STACKED \ 336 ((__force blk_features_t)(1u << 16)) 337 338 /* 339 * Flags automatically inherited when stacking limits. 340 */ 341 #define BLK_FEAT_INHERIT_MASK \ 342 (BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL | \ 343 BLK_FEAT_STABLE_WRITES | BLK_FEAT_ZONED | BLK_FEAT_BOUNCE_HIGH | \ 344 BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE) 345 346 /* internal flags in queue_limits.flags */ 347 typedef unsigned int __bitwise blk_flags_t; 348 349 /* do not send FLUSH/FUA commands despite advertising a write cache */ 350 #define BLK_FLAG_WRITE_CACHE_DISABLED ((__force blk_flags_t)(1u << 0)) 351 352 /* I/O topology is misaligned */ 353 #define BLK_FLAG_MISALIGNED ((__force blk_flags_t)(1u << 1)) 354 355 /* passthrough command IO accounting */ 356 #define BLK_FLAG_IOSTATS_PASSTHROUGH ((__force blk_flags_t)(1u << 2)) 357 358 struct queue_limits { 359 blk_features_t features; 360 blk_flags_t flags; 361 unsigned long seg_boundary_mask; 362 unsigned long virt_boundary_mask; 363 364 unsigned int max_hw_sectors; 365 unsigned int max_dev_sectors; 366 unsigned int chunk_sectors; 367 unsigned int max_sectors; 368 unsigned int max_user_sectors; 369 unsigned int max_segment_size; 370 unsigned int physical_block_size; 371 unsigned int logical_block_size; 372 unsigned int alignment_offset; 373 unsigned int io_min; 374 unsigned int io_opt; 375 unsigned int max_discard_sectors; 376 unsigned int max_hw_discard_sectors; 377 unsigned int max_user_discard_sectors; 378 unsigned int max_secure_erase_sectors; 379 unsigned int max_write_zeroes_sectors; 380 unsigned int max_hw_zone_append_sectors; 381 unsigned int max_zone_append_sectors; 382 unsigned int discard_granularity; 383 unsigned int discard_alignment; 384 unsigned int zone_write_granularity; 385 386 /* atomic write limits */ 387 unsigned int atomic_write_hw_max; 388 unsigned int atomic_write_max_sectors; 389 unsigned int atomic_write_hw_boundary; 390 unsigned int atomic_write_boundary_sectors; 391 unsigned int atomic_write_hw_unit_min; 392 unsigned int atomic_write_unit_min; 393 unsigned int atomic_write_hw_unit_max; 394 unsigned int atomic_write_unit_max; 395 396 unsigned short max_segments; 397 unsigned short max_integrity_segments; 398 unsigned short max_discard_segments; 399 400 unsigned int max_open_zones; 401 unsigned int max_active_zones; 402 403 /* 404 * Drivers that set dma_alignment to less than 511 must be prepared to 405 * handle individual bvec's that are not a multiple of a SECTOR_SIZE 406 * due to possible offsets. 407 */ 408 unsigned int dma_alignment; 409 unsigned int dma_pad_mask; 410 411 struct blk_integrity integrity; 412 }; 413 414 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 415 void *data); 416 417 #define BLK_ALL_ZONES ((unsigned int)-1) 418 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 419 unsigned int nr_zones, report_zones_cb cb, void *data); 420 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op, 421 sector_t sectors, sector_t nr_sectors); 422 int blk_revalidate_disk_zones(struct gendisk *disk); 423 424 /* 425 * Independent access ranges: struct blk_independent_access_range describes 426 * a range of contiguous sectors that can be accessed using device command 427 * execution resources that are independent from the resources used for 428 * other access ranges. This is typically found with single-LUN multi-actuator 429 * HDDs where each access range is served by a different set of heads. 430 * The set of independent ranges supported by the device is defined using 431 * struct blk_independent_access_ranges. The independent ranges must not overlap 432 * and must include all sectors within the disk capacity (no sector holes 433 * allowed). 434 * For a device with multiple ranges, requests targeting sectors in different 435 * ranges can be executed in parallel. A request can straddle an access range 436 * boundary. 437 */ 438 struct blk_independent_access_range { 439 struct kobject kobj; 440 sector_t sector; 441 sector_t nr_sectors; 442 }; 443 444 struct blk_independent_access_ranges { 445 struct kobject kobj; 446 bool sysfs_registered; 447 unsigned int nr_ia_ranges; 448 struct blk_independent_access_range ia_range[]; 449 }; 450 451 struct request_queue { 452 /* 453 * The queue owner gets to use this for whatever they like. 454 * ll_rw_blk doesn't touch it. 455 */ 456 void *queuedata; 457 458 struct elevator_queue *elevator; 459 460 const struct blk_mq_ops *mq_ops; 461 462 /* sw queues */ 463 struct blk_mq_ctx __percpu *queue_ctx; 464 465 /* 466 * various queue flags, see QUEUE_* below 467 */ 468 unsigned long queue_flags; 469 470 unsigned int rq_timeout; 471 472 unsigned int queue_depth; 473 474 refcount_t refs; 475 476 /* hw dispatch queues */ 477 unsigned int nr_hw_queues; 478 struct xarray hctx_table; 479 480 struct percpu_ref q_usage_counter; 481 struct lock_class_key io_lock_cls_key; 482 struct lockdep_map io_lockdep_map; 483 484 struct lock_class_key q_lock_cls_key; 485 struct lockdep_map q_lockdep_map; 486 487 struct request *last_merge; 488 489 spinlock_t queue_lock; 490 491 int quiesce_depth; 492 493 struct gendisk *disk; 494 495 /* 496 * mq queue kobject 497 */ 498 struct kobject *mq_kobj; 499 500 struct queue_limits limits; 501 502 #ifdef CONFIG_PM 503 struct device *dev; 504 enum rpm_status rpm_status; 505 #endif 506 507 /* 508 * Number of contexts that have called blk_set_pm_only(). If this 509 * counter is above zero then only RQF_PM requests are processed. 510 */ 511 atomic_t pm_only; 512 513 struct blk_queue_stats *stats; 514 struct rq_qos *rq_qos; 515 struct mutex rq_qos_mutex; 516 517 /* 518 * ida allocated id for this queue. Used to index queues from 519 * ioctx. 520 */ 521 int id; 522 523 /* 524 * queue settings 525 */ 526 unsigned long nr_requests; /* Max # of requests */ 527 528 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 529 struct blk_crypto_profile *crypto_profile; 530 struct kobject *crypto_kobject; 531 #endif 532 533 struct timer_list timeout; 534 struct work_struct timeout_work; 535 536 atomic_t nr_active_requests_shared_tags; 537 538 struct blk_mq_tags *sched_shared_tags; 539 540 struct list_head icq_list; 541 #ifdef CONFIG_BLK_CGROUP 542 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 543 struct blkcg_gq *root_blkg; 544 struct list_head blkg_list; 545 struct mutex blkcg_mutex; 546 #endif 547 548 int node; 549 550 spinlock_t requeue_lock; 551 struct list_head requeue_list; 552 struct delayed_work requeue_work; 553 554 #ifdef CONFIG_BLK_DEV_IO_TRACE 555 struct blk_trace __rcu *blk_trace; 556 #endif 557 /* 558 * for flush operations 559 */ 560 struct blk_flush_queue *fq; 561 struct list_head flush_list; 562 563 struct mutex sysfs_lock; 564 struct mutex sysfs_dir_lock; 565 struct mutex limits_lock; 566 567 /* 568 * for reusing dead hctx instance in case of updating 569 * nr_hw_queues 570 */ 571 struct list_head unused_hctx_list; 572 spinlock_t unused_hctx_lock; 573 574 int mq_freeze_depth; 575 576 #ifdef CONFIG_BLK_DEV_THROTTLING 577 /* Throttle data */ 578 struct throtl_data *td; 579 #endif 580 struct rcu_head rcu_head; 581 #ifdef CONFIG_LOCKDEP 582 struct task_struct *mq_freeze_owner; 583 int mq_freeze_owner_depth; 584 /* 585 * Records disk & queue state in current context, used in unfreeze 586 * queue 587 */ 588 bool mq_freeze_disk_dead; 589 bool mq_freeze_queue_dying; 590 #endif 591 wait_queue_head_t mq_freeze_wq; 592 /* 593 * Protect concurrent access to q_usage_counter by 594 * percpu_ref_kill() and percpu_ref_reinit(). 595 */ 596 struct mutex mq_freeze_lock; 597 598 struct blk_mq_tag_set *tag_set; 599 struct list_head tag_set_list; 600 601 struct dentry *debugfs_dir; 602 struct dentry *sched_debugfs_dir; 603 struct dentry *rqos_debugfs_dir; 604 /* 605 * Serializes all debugfs metadata operations using the above dentries. 606 */ 607 struct mutex debugfs_mutex; 608 609 bool mq_sysfs_init_done; 610 }; 611 612 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 613 enum { 614 QUEUE_FLAG_DYING, /* queue being torn down */ 615 QUEUE_FLAG_NOMERGES, /* disable merge attempts */ 616 QUEUE_FLAG_SAME_COMP, /* complete on same CPU-group */ 617 QUEUE_FLAG_FAIL_IO, /* fake timeout */ 618 QUEUE_FLAG_NOXMERGES, /* No extended merges */ 619 QUEUE_FLAG_SAME_FORCE, /* force complete on same CPU */ 620 QUEUE_FLAG_INIT_DONE, /* queue is initialized */ 621 QUEUE_FLAG_STATS, /* track IO start and completion times */ 622 QUEUE_FLAG_REGISTERED, /* queue has been registered to a disk */ 623 QUEUE_FLAG_QUIESCED, /* queue has been quiesced */ 624 QUEUE_FLAG_RQ_ALLOC_TIME, /* record rq->alloc_time_ns */ 625 QUEUE_FLAG_HCTX_ACTIVE, /* at least one blk-mq hctx is active */ 626 QUEUE_FLAG_SQ_SCHED, /* single queue style io dispatch */ 627 QUEUE_FLAG_MAX 628 }; 629 630 #define QUEUE_FLAG_MQ_DEFAULT (1UL << QUEUE_FLAG_SAME_COMP) 631 632 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 633 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 634 635 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 636 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 637 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 638 #define blk_queue_noxmerges(q) \ 639 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 640 #define blk_queue_nonrot(q) (!((q)->limits.features & BLK_FEAT_ROTATIONAL)) 641 #define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT) 642 #define blk_queue_passthrough_stat(q) \ 643 ((q)->limits.flags & BLK_FLAG_IOSTATS_PASSTHROUGH) 644 #define blk_queue_dax(q) ((q)->limits.features & BLK_FEAT_DAX) 645 #define blk_queue_pci_p2pdma(q) ((q)->limits.features & BLK_FEAT_PCI_P2PDMA) 646 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 647 #define blk_queue_rq_alloc_time(q) \ 648 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 649 #else 650 #define blk_queue_rq_alloc_time(q) false 651 #endif 652 653 #define blk_noretry_request(rq) \ 654 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 655 REQ_FAILFAST_DRIVER)) 656 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 657 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 658 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 659 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags) 660 #define blk_queue_skip_tagset_quiesce(q) \ 661 ((q)->limits.features & BLK_FEAT_SKIP_TAGSET_QUIESCE) 662 663 extern void blk_set_pm_only(struct request_queue *q); 664 extern void blk_clear_pm_only(struct request_queue *q); 665 666 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 667 668 #define dma_map_bvec(dev, bv, dir, attrs) \ 669 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 670 (dir), (attrs)) 671 672 static inline bool queue_is_mq(struct request_queue *q) 673 { 674 return q->mq_ops; 675 } 676 677 #ifdef CONFIG_PM 678 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 679 { 680 return q->rpm_status; 681 } 682 #else 683 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 684 { 685 return RPM_ACTIVE; 686 } 687 #endif 688 689 static inline bool blk_queue_is_zoned(struct request_queue *q) 690 { 691 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && 692 (q->limits.features & BLK_FEAT_ZONED); 693 } 694 695 #ifdef CONFIG_BLK_DEV_ZONED 696 static inline unsigned int disk_nr_zones(struct gendisk *disk) 697 { 698 return disk->nr_zones; 699 } 700 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs); 701 #else /* CONFIG_BLK_DEV_ZONED */ 702 static inline unsigned int disk_nr_zones(struct gendisk *disk) 703 { 704 return 0; 705 } 706 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs) 707 { 708 return false; 709 } 710 #endif /* CONFIG_BLK_DEV_ZONED */ 711 712 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) 713 { 714 if (!blk_queue_is_zoned(disk->queue)) 715 return 0; 716 return sector >> ilog2(disk->queue->limits.chunk_sectors); 717 } 718 719 static inline unsigned int bdev_nr_zones(struct block_device *bdev) 720 { 721 return disk_nr_zones(bdev->bd_disk); 722 } 723 724 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 725 { 726 return bdev->bd_disk->queue->limits.max_open_zones; 727 } 728 729 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 730 { 731 return bdev->bd_disk->queue->limits.max_active_zones; 732 } 733 734 static inline unsigned int blk_queue_depth(struct request_queue *q) 735 { 736 if (q->queue_depth) 737 return q->queue_depth; 738 739 return q->nr_requests; 740 } 741 742 /* 743 * default timeout for SG_IO if none specified 744 */ 745 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 746 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 747 748 /* This should not be used directly - use rq_for_each_segment */ 749 #define for_each_bio(_bio) \ 750 for (; _bio; _bio = _bio->bi_next) 751 752 int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk, 753 const struct attribute_group **groups, 754 struct fwnode_handle *fwnode); 755 int __must_check device_add_disk(struct device *parent, struct gendisk *disk, 756 const struct attribute_group **groups); 757 static inline int __must_check add_disk(struct gendisk *disk) 758 { 759 return device_add_disk(NULL, disk, NULL); 760 } 761 void del_gendisk(struct gendisk *gp); 762 void invalidate_disk(struct gendisk *disk); 763 void set_disk_ro(struct gendisk *disk, bool read_only); 764 void disk_uevent(struct gendisk *disk, enum kobject_action action); 765 766 static inline u8 bdev_partno(const struct block_device *bdev) 767 { 768 return atomic_read(&bdev->__bd_flags) & BD_PARTNO; 769 } 770 771 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag) 772 { 773 return atomic_read(&bdev->__bd_flags) & flag; 774 } 775 776 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag) 777 { 778 atomic_or(flag, &bdev->__bd_flags); 779 } 780 781 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag) 782 { 783 atomic_andnot(flag, &bdev->__bd_flags); 784 } 785 786 static inline bool get_disk_ro(struct gendisk *disk) 787 { 788 return bdev_test_flag(disk->part0, BD_READ_ONLY) || 789 test_bit(GD_READ_ONLY, &disk->state); 790 } 791 792 static inline bool bdev_read_only(struct block_device *bdev) 793 { 794 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk); 795 } 796 797 bool set_capacity_and_notify(struct gendisk *disk, sector_t size); 798 void disk_force_media_change(struct gendisk *disk); 799 void bdev_mark_dead(struct block_device *bdev, bool surprise); 800 801 void add_disk_randomness(struct gendisk *disk) __latent_entropy; 802 void rand_initialize_disk(struct gendisk *disk); 803 804 static inline sector_t get_start_sect(struct block_device *bdev) 805 { 806 return bdev->bd_start_sect; 807 } 808 809 static inline sector_t bdev_nr_sectors(struct block_device *bdev) 810 { 811 return bdev->bd_nr_sectors; 812 } 813 814 static inline loff_t bdev_nr_bytes(struct block_device *bdev) 815 { 816 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT; 817 } 818 819 static inline sector_t get_capacity(struct gendisk *disk) 820 { 821 return bdev_nr_sectors(disk->part0); 822 } 823 824 static inline u64 sb_bdev_nr_blocks(struct super_block *sb) 825 { 826 return bdev_nr_sectors(sb->s_bdev) >> 827 (sb->s_blocksize_bits - SECTOR_SHIFT); 828 } 829 830 int bdev_disk_changed(struct gendisk *disk, bool invalidate); 831 832 void put_disk(struct gendisk *disk); 833 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node, 834 struct lock_class_key *lkclass); 835 836 /** 837 * blk_alloc_disk - allocate a gendisk structure 838 * @lim: queue limits to be used for this disk. 839 * @node_id: numa node to allocate on 840 * 841 * Allocate and pre-initialize a gendisk structure for use with BIO based 842 * drivers. 843 * 844 * Returns an ERR_PTR on error, else the allocated disk. 845 * 846 * Context: can sleep 847 */ 848 #define blk_alloc_disk(lim, node_id) \ 849 ({ \ 850 static struct lock_class_key __key; \ 851 \ 852 __blk_alloc_disk(lim, node_id, &__key); \ 853 }) 854 855 int __register_blkdev(unsigned int major, const char *name, 856 void (*probe)(dev_t devt)); 857 #define register_blkdev(major, name) \ 858 __register_blkdev(major, name, NULL) 859 void unregister_blkdev(unsigned int major, const char *name); 860 861 bool disk_check_media_change(struct gendisk *disk); 862 void set_capacity(struct gendisk *disk, sector_t size); 863 864 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 865 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 866 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); 867 #else 868 static inline int bd_link_disk_holder(struct block_device *bdev, 869 struct gendisk *disk) 870 { 871 return 0; 872 } 873 static inline void bd_unlink_disk_holder(struct block_device *bdev, 874 struct gendisk *disk) 875 { 876 } 877 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ 878 879 dev_t part_devt(struct gendisk *disk, u8 partno); 880 void inc_diskseq(struct gendisk *disk); 881 void blk_request_module(dev_t devt); 882 883 extern int blk_register_queue(struct gendisk *disk); 884 extern void blk_unregister_queue(struct gendisk *disk); 885 void submit_bio_noacct(struct bio *bio); 886 struct bio *bio_split_to_limits(struct bio *bio); 887 888 extern int blk_lld_busy(struct request_queue *q); 889 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 890 extern void blk_queue_exit(struct request_queue *q); 891 extern void blk_sync_queue(struct request_queue *q); 892 893 /* Helper to convert REQ_OP_XXX to its string format XXX */ 894 extern const char *blk_op_str(enum req_op op); 895 896 int blk_status_to_errno(blk_status_t status); 897 blk_status_t errno_to_blk_status(int errno); 898 const char *blk_status_to_str(blk_status_t status); 899 900 /* only poll the hardware once, don't continue until a completion was found */ 901 #define BLK_POLL_ONESHOT (1 << 0) 902 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); 903 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, 904 unsigned int flags); 905 906 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 907 { 908 return bdev->bd_queue; /* this is never NULL */ 909 } 910 911 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 912 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 913 914 static inline unsigned int bio_zone_no(struct bio *bio) 915 { 916 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector); 917 } 918 919 static inline bool bio_straddles_zones(struct bio *bio) 920 { 921 return bio_sectors(bio) && 922 bio_zone_no(bio) != 923 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1); 924 } 925 926 /* 927 * Return how much within the boundary is left to be used for I/O at a given 928 * offset. 929 */ 930 static inline unsigned int blk_boundary_sectors_left(sector_t offset, 931 unsigned int boundary_sectors) 932 { 933 if (unlikely(!is_power_of_2(boundary_sectors))) 934 return boundary_sectors - sector_div(offset, boundary_sectors); 935 return boundary_sectors - (offset & (boundary_sectors - 1)); 936 } 937 938 /** 939 * queue_limits_start_update - start an atomic update of queue limits 940 * @q: queue to update 941 * 942 * This functions starts an atomic update of the queue limits. It takes a lock 943 * to prevent other updates and returns a snapshot of the current limits that 944 * the caller can modify. The caller must call queue_limits_commit_update() 945 * to finish the update. 946 * 947 * Context: process context. 948 */ 949 static inline struct queue_limits 950 queue_limits_start_update(struct request_queue *q) 951 { 952 mutex_lock(&q->limits_lock); 953 return q->limits; 954 } 955 int queue_limits_commit_update(struct request_queue *q, 956 struct queue_limits *lim); 957 int queue_limits_set(struct request_queue *q, struct queue_limits *lim); 958 int blk_validate_limits(struct queue_limits *lim); 959 960 /** 961 * queue_limits_cancel_update - cancel an atomic update of queue limits 962 * @q: queue to update 963 * 964 * This functions cancels an atomic update of the queue limits started by 965 * queue_limits_start_update() and should be used when an error occurs after 966 * starting update. 967 */ 968 static inline void queue_limits_cancel_update(struct request_queue *q) 969 { 970 mutex_unlock(&q->limits_lock); 971 } 972 973 /* 974 * These helpers are for drivers that have sloppy feature negotiation and might 975 * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O 976 * completion handler when the device returned an indicator that the respective 977 * feature is not actually supported. They are racy and the driver needs to 978 * cope with that. Try to avoid this scheme if you can. 979 */ 980 static inline void blk_queue_disable_discard(struct request_queue *q) 981 { 982 q->limits.max_discard_sectors = 0; 983 } 984 985 static inline void blk_queue_disable_secure_erase(struct request_queue *q) 986 { 987 q->limits.max_secure_erase_sectors = 0; 988 } 989 990 static inline void blk_queue_disable_write_zeroes(struct request_queue *q) 991 { 992 q->limits.max_write_zeroes_sectors = 0; 993 } 994 995 /* 996 * Access functions for manipulating queue properties 997 */ 998 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 999 extern void blk_set_stacking_limits(struct queue_limits *lim); 1000 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1001 sector_t offset); 1002 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, 1003 sector_t offset, const char *pfx); 1004 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1005 1006 struct blk_independent_access_ranges * 1007 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); 1008 void disk_set_independent_access_ranges(struct gendisk *disk, 1009 struct blk_independent_access_ranges *iars); 1010 1011 bool __must_check blk_get_queue(struct request_queue *); 1012 extern void blk_put_queue(struct request_queue *); 1013 1014 void blk_mark_disk_dead(struct gendisk *disk); 1015 1016 struct rq_list { 1017 struct request *head; 1018 struct request *tail; 1019 }; 1020 1021 #ifdef CONFIG_BLOCK 1022 /* 1023 * blk_plug permits building a queue of related requests by holding the I/O 1024 * fragments for a short period. This allows merging of sequential requests 1025 * into single larger request. As the requests are moved from a per-task list to 1026 * the device's request_queue in a batch, this results in improved scalability 1027 * as the lock contention for request_queue lock is reduced. 1028 * 1029 * It is ok not to disable preemption when adding the request to the plug list 1030 * or when attempting a merge. For details, please see schedule() where 1031 * blk_flush_plug() is called. 1032 */ 1033 struct blk_plug { 1034 struct rq_list mq_list; /* blk-mq requests */ 1035 1036 /* if ios_left is > 1, we can batch tag/rq allocations */ 1037 struct rq_list cached_rqs; 1038 u64 cur_ktime; 1039 unsigned short nr_ios; 1040 1041 unsigned short rq_count; 1042 1043 bool multiple_queues; 1044 bool has_elevator; 1045 1046 struct list_head cb_list; /* md requires an unplug callback */ 1047 }; 1048 1049 struct blk_plug_cb; 1050 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1051 struct blk_plug_cb { 1052 struct list_head list; 1053 blk_plug_cb_fn callback; 1054 void *data; 1055 }; 1056 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1057 void *data, int size); 1058 extern void blk_start_plug(struct blk_plug *); 1059 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); 1060 extern void blk_finish_plug(struct blk_plug *); 1061 1062 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule); 1063 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1064 { 1065 if (plug) 1066 __blk_flush_plug(plug, async); 1067 } 1068 1069 /* 1070 * tsk == current here 1071 */ 1072 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1073 { 1074 struct blk_plug *plug = tsk->plug; 1075 1076 if (plug) 1077 plug->cur_ktime = 0; 1078 current->flags &= ~PF_BLOCK_TS; 1079 } 1080 1081 int blkdev_issue_flush(struct block_device *bdev); 1082 long nr_blockdev_pages(void); 1083 #else /* CONFIG_BLOCK */ 1084 struct blk_plug { 1085 }; 1086 1087 static inline void blk_start_plug_nr_ios(struct blk_plug *plug, 1088 unsigned short nr_ios) 1089 { 1090 } 1091 1092 static inline void blk_start_plug(struct blk_plug *plug) 1093 { 1094 } 1095 1096 static inline void blk_finish_plug(struct blk_plug *plug) 1097 { 1098 } 1099 1100 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1101 { 1102 } 1103 1104 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1105 { 1106 } 1107 1108 static inline int blkdev_issue_flush(struct block_device *bdev) 1109 { 1110 return 0; 1111 } 1112 1113 static inline long nr_blockdev_pages(void) 1114 { 1115 return 0; 1116 } 1117 #endif /* CONFIG_BLOCK */ 1118 1119 extern void blk_io_schedule(void); 1120 1121 int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1122 sector_t nr_sects, gfp_t gfp_mask); 1123 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1124 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); 1125 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, 1126 sector_t nr_sects, gfp_t gfp); 1127 1128 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1129 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1130 #define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */ 1131 1132 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1133 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1134 unsigned flags); 1135 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1136 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1137 1138 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1139 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1140 { 1141 return blkdev_issue_discard(sb->s_bdev, 1142 block << (sb->s_blocksize_bits - 1143 SECTOR_SHIFT), 1144 nr_blocks << (sb->s_blocksize_bits - 1145 SECTOR_SHIFT), 1146 gfp_mask); 1147 } 1148 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1149 sector_t nr_blocks, gfp_t gfp_mask) 1150 { 1151 return blkdev_issue_zeroout(sb->s_bdev, 1152 block << (sb->s_blocksize_bits - 1153 SECTOR_SHIFT), 1154 nr_blocks << (sb->s_blocksize_bits - 1155 SECTOR_SHIFT), 1156 gfp_mask, 0); 1157 } 1158 1159 static inline bool bdev_is_partition(struct block_device *bdev) 1160 { 1161 return bdev_partno(bdev) != 0; 1162 } 1163 1164 enum blk_default_limits { 1165 BLK_MAX_SEGMENTS = 128, 1166 BLK_SAFE_MAX_SECTORS = 255, 1167 BLK_MAX_SEGMENT_SIZE = 65536, 1168 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1169 }; 1170 1171 /* 1172 * Default upper limit for the software max_sectors limit used for 1173 * regular file system I/O. This can be increased through sysfs. 1174 * 1175 * Not to be confused with the max_hw_sector limit that is entirely 1176 * controlled by the driver, usually based on hardware limits. 1177 */ 1178 #define BLK_DEF_MAX_SECTORS_CAP 2560u 1179 1180 static inline struct queue_limits *bdev_limits(struct block_device *bdev) 1181 { 1182 return &bdev_get_queue(bdev)->limits; 1183 } 1184 1185 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1186 { 1187 return q->limits.seg_boundary_mask; 1188 } 1189 1190 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1191 { 1192 return q->limits.virt_boundary_mask; 1193 } 1194 1195 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1196 { 1197 return q->limits.max_sectors; 1198 } 1199 1200 static inline unsigned int queue_max_bytes(struct request_queue *q) 1201 { 1202 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9; 1203 } 1204 1205 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1206 { 1207 return q->limits.max_hw_sectors; 1208 } 1209 1210 static inline unsigned short queue_max_segments(const struct request_queue *q) 1211 { 1212 return q->limits.max_segments; 1213 } 1214 1215 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1216 { 1217 return q->limits.max_discard_segments; 1218 } 1219 1220 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1221 { 1222 return q->limits.max_segment_size; 1223 } 1224 1225 static inline bool queue_emulates_zone_append(struct request_queue *q) 1226 { 1227 return blk_queue_is_zoned(q) && !q->limits.max_hw_zone_append_sectors; 1228 } 1229 1230 static inline bool bdev_emulates_zone_append(struct block_device *bdev) 1231 { 1232 return queue_emulates_zone_append(bdev_get_queue(bdev)); 1233 } 1234 1235 static inline unsigned int 1236 bdev_max_zone_append_sectors(struct block_device *bdev) 1237 { 1238 return bdev_limits(bdev)->max_zone_append_sectors; 1239 } 1240 1241 static inline unsigned int bdev_max_segments(struct block_device *bdev) 1242 { 1243 return queue_max_segments(bdev_get_queue(bdev)); 1244 } 1245 1246 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1247 { 1248 return q->limits.logical_block_size; 1249 } 1250 1251 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1252 { 1253 return queue_logical_block_size(bdev_get_queue(bdev)); 1254 } 1255 1256 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1257 { 1258 return q->limits.physical_block_size; 1259 } 1260 1261 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1262 { 1263 return queue_physical_block_size(bdev_get_queue(bdev)); 1264 } 1265 1266 static inline unsigned int queue_io_min(const struct request_queue *q) 1267 { 1268 return q->limits.io_min; 1269 } 1270 1271 static inline unsigned int bdev_io_min(struct block_device *bdev) 1272 { 1273 return queue_io_min(bdev_get_queue(bdev)); 1274 } 1275 1276 static inline unsigned int queue_io_opt(const struct request_queue *q) 1277 { 1278 return q->limits.io_opt; 1279 } 1280 1281 static inline unsigned int bdev_io_opt(struct block_device *bdev) 1282 { 1283 return queue_io_opt(bdev_get_queue(bdev)); 1284 } 1285 1286 static inline unsigned int 1287 queue_zone_write_granularity(const struct request_queue *q) 1288 { 1289 return q->limits.zone_write_granularity; 1290 } 1291 1292 static inline unsigned int 1293 bdev_zone_write_granularity(struct block_device *bdev) 1294 { 1295 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1296 } 1297 1298 int bdev_alignment_offset(struct block_device *bdev); 1299 unsigned int bdev_discard_alignment(struct block_device *bdev); 1300 1301 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev) 1302 { 1303 return bdev_limits(bdev)->max_discard_sectors; 1304 } 1305 1306 static inline unsigned int bdev_discard_granularity(struct block_device *bdev) 1307 { 1308 return bdev_limits(bdev)->discard_granularity; 1309 } 1310 1311 static inline unsigned int 1312 bdev_max_secure_erase_sectors(struct block_device *bdev) 1313 { 1314 return bdev_limits(bdev)->max_secure_erase_sectors; 1315 } 1316 1317 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1318 { 1319 return bdev_limits(bdev)->max_write_zeroes_sectors; 1320 } 1321 1322 static inline bool bdev_nonrot(struct block_device *bdev) 1323 { 1324 return blk_queue_nonrot(bdev_get_queue(bdev)); 1325 } 1326 1327 static inline bool bdev_synchronous(struct block_device *bdev) 1328 { 1329 return bdev->bd_disk->queue->limits.features & BLK_FEAT_SYNCHRONOUS; 1330 } 1331 1332 static inline bool bdev_stable_writes(struct block_device *bdev) 1333 { 1334 struct request_queue *q = bdev_get_queue(bdev); 1335 1336 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) && 1337 q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE) 1338 return true; 1339 return q->limits.features & BLK_FEAT_STABLE_WRITES; 1340 } 1341 1342 static inline bool blk_queue_write_cache(struct request_queue *q) 1343 { 1344 return (q->limits.features & BLK_FEAT_WRITE_CACHE) && 1345 !(q->limits.flags & BLK_FLAG_WRITE_CACHE_DISABLED); 1346 } 1347 1348 static inline bool bdev_write_cache(struct block_device *bdev) 1349 { 1350 return blk_queue_write_cache(bdev_get_queue(bdev)); 1351 } 1352 1353 static inline bool bdev_fua(struct block_device *bdev) 1354 { 1355 return bdev_limits(bdev)->features & BLK_FEAT_FUA; 1356 } 1357 1358 static inline bool bdev_nowait(struct block_device *bdev) 1359 { 1360 return bdev->bd_disk->queue->limits.features & BLK_FEAT_NOWAIT; 1361 } 1362 1363 static inline bool bdev_is_zoned(struct block_device *bdev) 1364 { 1365 return blk_queue_is_zoned(bdev_get_queue(bdev)); 1366 } 1367 1368 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec) 1369 { 1370 return disk_zone_no(bdev->bd_disk, sec); 1371 } 1372 1373 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1374 { 1375 struct request_queue *q = bdev_get_queue(bdev); 1376 1377 if (!blk_queue_is_zoned(q)) 1378 return 0; 1379 return q->limits.chunk_sectors; 1380 } 1381 1382 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev, 1383 sector_t sector) 1384 { 1385 return sector & (bdev_zone_sectors(bdev) - 1); 1386 } 1387 1388 static inline sector_t bio_offset_from_zone_start(struct bio *bio) 1389 { 1390 return bdev_offset_from_zone_start(bio->bi_bdev, 1391 bio->bi_iter.bi_sector); 1392 } 1393 1394 static inline bool bdev_is_zone_start(struct block_device *bdev, 1395 sector_t sector) 1396 { 1397 return bdev_offset_from_zone_start(bdev, sector) == 0; 1398 } 1399 1400 /** 1401 * bdev_zone_is_seq - check if a sector belongs to a sequential write zone 1402 * @bdev: block device to check 1403 * @sector: sector number 1404 * 1405 * Check if @sector on @bdev is contained in a sequential write required zone. 1406 */ 1407 static inline bool bdev_zone_is_seq(struct block_device *bdev, sector_t sector) 1408 { 1409 bool is_seq = false; 1410 1411 #if IS_ENABLED(CONFIG_BLK_DEV_ZONED) 1412 if (bdev_is_zoned(bdev)) { 1413 struct gendisk *disk = bdev->bd_disk; 1414 unsigned long *bitmap; 1415 1416 rcu_read_lock(); 1417 bitmap = rcu_dereference(disk->conv_zones_bitmap); 1418 is_seq = !bitmap || 1419 !test_bit(disk_zone_no(disk, sector), bitmap); 1420 rcu_read_unlock(); 1421 } 1422 #endif 1423 1424 return is_seq; 1425 } 1426 1427 int blk_zone_issue_zeroout(struct block_device *bdev, sector_t sector, 1428 sector_t nr_sects, gfp_t gfp_mask); 1429 1430 static inline unsigned int queue_dma_alignment(const struct request_queue *q) 1431 { 1432 return q->limits.dma_alignment; 1433 } 1434 1435 static inline unsigned int 1436 queue_atomic_write_unit_max_bytes(const struct request_queue *q) 1437 { 1438 return q->limits.atomic_write_unit_max; 1439 } 1440 1441 static inline unsigned int 1442 queue_atomic_write_unit_min_bytes(const struct request_queue *q) 1443 { 1444 return q->limits.atomic_write_unit_min; 1445 } 1446 1447 static inline unsigned int 1448 queue_atomic_write_boundary_bytes(const struct request_queue *q) 1449 { 1450 return q->limits.atomic_write_boundary_sectors << SECTOR_SHIFT; 1451 } 1452 1453 static inline unsigned int 1454 queue_atomic_write_max_bytes(const struct request_queue *q) 1455 { 1456 return q->limits.atomic_write_max_sectors << SECTOR_SHIFT; 1457 } 1458 1459 static inline unsigned int bdev_dma_alignment(struct block_device *bdev) 1460 { 1461 return queue_dma_alignment(bdev_get_queue(bdev)); 1462 } 1463 1464 static inline bool bdev_iter_is_aligned(struct block_device *bdev, 1465 struct iov_iter *iter) 1466 { 1467 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev), 1468 bdev_logical_block_size(bdev) - 1); 1469 } 1470 1471 static inline unsigned int 1472 blk_lim_dma_alignment_and_pad(struct queue_limits *lim) 1473 { 1474 return lim->dma_alignment | lim->dma_pad_mask; 1475 } 1476 1477 static inline bool blk_rq_aligned(struct request_queue *q, unsigned long addr, 1478 unsigned int len) 1479 { 1480 unsigned int alignment = blk_lim_dma_alignment_and_pad(&q->limits); 1481 1482 return !(addr & alignment) && !(len & alignment); 1483 } 1484 1485 /* assumes size > 256 */ 1486 static inline unsigned int blksize_bits(unsigned int size) 1487 { 1488 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT; 1489 } 1490 1491 int kblockd_schedule_work(struct work_struct *work); 1492 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1493 1494 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1495 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1496 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1497 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1498 1499 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1500 1501 bool blk_crypto_register(struct blk_crypto_profile *profile, 1502 struct request_queue *q); 1503 1504 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1505 1506 static inline bool blk_crypto_register(struct blk_crypto_profile *profile, 1507 struct request_queue *q) 1508 { 1509 return true; 1510 } 1511 1512 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1513 1514 enum blk_unique_id { 1515 /* these match the Designator Types specified in SPC */ 1516 BLK_UID_T10 = 1, 1517 BLK_UID_EUI64 = 2, 1518 BLK_UID_NAA = 3, 1519 }; 1520 1521 struct block_device_operations { 1522 void (*submit_bio)(struct bio *bio); 1523 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob, 1524 unsigned int flags); 1525 int (*open)(struct gendisk *disk, blk_mode_t mode); 1526 void (*release)(struct gendisk *disk); 1527 int (*ioctl)(struct block_device *bdev, blk_mode_t mode, 1528 unsigned cmd, unsigned long arg); 1529 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode, 1530 unsigned cmd, unsigned long arg); 1531 unsigned int (*check_events) (struct gendisk *disk, 1532 unsigned int clearing); 1533 void (*unlock_native_capacity) (struct gendisk *); 1534 int (*getgeo)(struct block_device *, struct hd_geometry *); 1535 int (*set_read_only)(struct block_device *bdev, bool ro); 1536 void (*free_disk)(struct gendisk *disk); 1537 /* this callback is with swap_lock and sometimes page table lock held */ 1538 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1539 int (*report_zones)(struct gendisk *, sector_t sector, 1540 unsigned int nr_zones, report_zones_cb cb, void *data); 1541 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1542 /* returns the length of the identifier or a negative errno: */ 1543 int (*get_unique_id)(struct gendisk *disk, u8 id[16], 1544 enum blk_unique_id id_type); 1545 struct module *owner; 1546 const struct pr_ops *pr_ops; 1547 1548 /* 1549 * Special callback for probing GPT entry at a given sector. 1550 * Needed by Android devices, used by GPT scanner and MMC blk 1551 * driver. 1552 */ 1553 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector); 1554 }; 1555 1556 #ifdef CONFIG_COMPAT 1557 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t, 1558 unsigned int, unsigned long); 1559 #else 1560 #define blkdev_compat_ptr_ioctl NULL 1561 #endif 1562 1563 static inline void blk_wake_io_task(struct task_struct *waiter) 1564 { 1565 /* 1566 * If we're polling, the task itself is doing the completions. For 1567 * that case, we don't need to signal a wakeup, it's enough to just 1568 * mark us as RUNNING. 1569 */ 1570 if (waiter == current) 1571 __set_current_state(TASK_RUNNING); 1572 else 1573 wake_up_process(waiter); 1574 } 1575 1576 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op, 1577 unsigned long start_time); 1578 void bdev_end_io_acct(struct block_device *bdev, enum req_op op, 1579 unsigned int sectors, unsigned long start_time); 1580 1581 unsigned long bio_start_io_acct(struct bio *bio); 1582 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1583 struct block_device *orig_bdev); 1584 1585 /** 1586 * bio_end_io_acct - end I/O accounting for bio based drivers 1587 * @bio: bio to end account for 1588 * @start_time: start time returned by bio_start_io_acct() 1589 */ 1590 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1591 { 1592 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1593 } 1594 1595 int set_blocksize(struct file *file, int size); 1596 1597 int lookup_bdev(const char *pathname, dev_t *dev); 1598 1599 void blkdev_show(struct seq_file *seqf, off_t offset); 1600 1601 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1602 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1603 #ifdef CONFIG_BLOCK 1604 #define BLKDEV_MAJOR_MAX 512 1605 #else 1606 #define BLKDEV_MAJOR_MAX 0 1607 #endif 1608 1609 struct blk_holder_ops { 1610 void (*mark_dead)(struct block_device *bdev, bool surprise); 1611 1612 /* 1613 * Sync the file system mounted on the block device. 1614 */ 1615 void (*sync)(struct block_device *bdev); 1616 1617 /* 1618 * Freeze the file system mounted on the block device. 1619 */ 1620 int (*freeze)(struct block_device *bdev); 1621 1622 /* 1623 * Thaw the file system mounted on the block device. 1624 */ 1625 int (*thaw)(struct block_device *bdev); 1626 }; 1627 1628 /* 1629 * For filesystems using @fs_holder_ops, the @holder argument passed to 1630 * helpers used to open and claim block devices via 1631 * bd_prepare_to_claim() must point to a superblock. 1632 */ 1633 extern const struct blk_holder_ops fs_holder_ops; 1634 1635 /* 1636 * Return the correct open flags for blkdev_get_by_* for super block flags 1637 * as stored in sb->s_flags. 1638 */ 1639 #define sb_open_mode(flags) \ 1640 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \ 1641 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE)) 1642 1643 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, 1644 const struct blk_holder_ops *hops); 1645 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode, 1646 void *holder, const struct blk_holder_ops *hops); 1647 int bd_prepare_to_claim(struct block_device *bdev, void *holder, 1648 const struct blk_holder_ops *hops); 1649 void bd_abort_claiming(struct block_device *bdev, void *holder); 1650 1651 /* just for blk-cgroup, don't use elsewhere */ 1652 struct block_device *blkdev_get_no_open(dev_t dev); 1653 void blkdev_put_no_open(struct block_device *bdev); 1654 1655 struct block_device *I_BDEV(struct inode *inode); 1656 struct block_device *file_bdev(struct file *bdev_file); 1657 bool disk_live(struct gendisk *disk); 1658 unsigned int block_size(struct block_device *bdev); 1659 1660 #ifdef CONFIG_BLOCK 1661 void invalidate_bdev(struct block_device *bdev); 1662 int sync_blockdev(struct block_device *bdev); 1663 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); 1664 int sync_blockdev_nowait(struct block_device *bdev); 1665 void sync_bdevs(bool wait); 1666 void bdev_statx(struct path *, struct kstat *, u32); 1667 void printk_all_partitions(void); 1668 int __init early_lookup_bdev(const char *pathname, dev_t *dev); 1669 #else 1670 static inline void invalidate_bdev(struct block_device *bdev) 1671 { 1672 } 1673 static inline int sync_blockdev(struct block_device *bdev) 1674 { 1675 return 0; 1676 } 1677 static inline int sync_blockdev_nowait(struct block_device *bdev) 1678 { 1679 return 0; 1680 } 1681 static inline void sync_bdevs(bool wait) 1682 { 1683 } 1684 static inline void bdev_statx(struct path *path, struct kstat *stat, 1685 u32 request_mask) 1686 { 1687 } 1688 static inline void printk_all_partitions(void) 1689 { 1690 } 1691 static inline int early_lookup_bdev(const char *pathname, dev_t *dev) 1692 { 1693 return -EINVAL; 1694 } 1695 #endif /* CONFIG_BLOCK */ 1696 1697 int bdev_freeze(struct block_device *bdev); 1698 int bdev_thaw(struct block_device *bdev); 1699 void bdev_fput(struct file *bdev_file); 1700 1701 struct io_comp_batch { 1702 struct rq_list req_list; 1703 bool need_ts; 1704 void (*complete)(struct io_comp_batch *); 1705 }; 1706 1707 static inline bool bdev_can_atomic_write(struct block_device *bdev) 1708 { 1709 struct request_queue *bd_queue = bdev->bd_queue; 1710 struct queue_limits *limits = &bd_queue->limits; 1711 1712 if (!limits->atomic_write_unit_min) 1713 return false; 1714 1715 if (bdev_is_partition(bdev)) { 1716 sector_t bd_start_sect = bdev->bd_start_sect; 1717 unsigned int alignment = 1718 max(limits->atomic_write_unit_min, 1719 limits->atomic_write_hw_boundary); 1720 1721 if (!IS_ALIGNED(bd_start_sect, alignment >> SECTOR_SHIFT)) 1722 return false; 1723 } 1724 1725 return true; 1726 } 1727 1728 static inline unsigned int 1729 bdev_atomic_write_unit_min_bytes(struct block_device *bdev) 1730 { 1731 if (!bdev_can_atomic_write(bdev)) 1732 return 0; 1733 return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev)); 1734 } 1735 1736 static inline unsigned int 1737 bdev_atomic_write_unit_max_bytes(struct block_device *bdev) 1738 { 1739 if (!bdev_can_atomic_write(bdev)) 1740 return 0; 1741 return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev)); 1742 } 1743 1744 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } 1745 1746 #endif /* _LINUX_BLKDEV_H */ 1747