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 /* atomic writes enabled */ 335 #define BLK_FEAT_ATOMIC_WRITES \ 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 limits_lock; 565 566 /* 567 * for reusing dead hctx instance in case of updating 568 * nr_hw_queues 569 */ 570 struct list_head unused_hctx_list; 571 spinlock_t unused_hctx_lock; 572 573 int mq_freeze_depth; 574 575 #ifdef CONFIG_BLK_DEV_THROTTLING 576 /* Throttle data */ 577 struct throtl_data *td; 578 #endif 579 struct rcu_head rcu_head; 580 #ifdef CONFIG_LOCKDEP 581 struct task_struct *mq_freeze_owner; 582 int mq_freeze_owner_depth; 583 /* 584 * Records disk & queue state in current context, used in unfreeze 585 * queue 586 */ 587 bool mq_freeze_disk_dead; 588 bool mq_freeze_queue_dying; 589 #endif 590 wait_queue_head_t mq_freeze_wq; 591 /* 592 * Protect concurrent access to q_usage_counter by 593 * percpu_ref_kill() and percpu_ref_reinit(). 594 */ 595 struct mutex mq_freeze_lock; 596 597 struct blk_mq_tag_set *tag_set; 598 struct list_head tag_set_list; 599 600 struct dentry *debugfs_dir; 601 struct dentry *sched_debugfs_dir; 602 struct dentry *rqos_debugfs_dir; 603 /* 604 * Serializes all debugfs metadata operations using the above dentries. 605 */ 606 struct mutex debugfs_mutex; 607 }; 608 609 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 610 enum { 611 QUEUE_FLAG_DYING, /* queue being torn down */ 612 QUEUE_FLAG_NOMERGES, /* disable merge attempts */ 613 QUEUE_FLAG_SAME_COMP, /* complete on same CPU-group */ 614 QUEUE_FLAG_FAIL_IO, /* fake timeout */ 615 QUEUE_FLAG_NOXMERGES, /* No extended merges */ 616 QUEUE_FLAG_SAME_FORCE, /* force complete on same CPU */ 617 QUEUE_FLAG_INIT_DONE, /* queue is initialized */ 618 QUEUE_FLAG_STATS, /* track IO start and completion times */ 619 QUEUE_FLAG_REGISTERED, /* queue has been registered to a disk */ 620 QUEUE_FLAG_QUIESCED, /* queue has been quiesced */ 621 QUEUE_FLAG_RQ_ALLOC_TIME, /* record rq->alloc_time_ns */ 622 QUEUE_FLAG_HCTX_ACTIVE, /* at least one blk-mq hctx is active */ 623 QUEUE_FLAG_SQ_SCHED, /* single queue style io dispatch */ 624 QUEUE_FLAG_MAX 625 }; 626 627 #define QUEUE_FLAG_MQ_DEFAULT (1UL << QUEUE_FLAG_SAME_COMP) 628 629 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 630 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 631 632 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 633 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 634 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 635 #define blk_queue_noxmerges(q) \ 636 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 637 #define blk_queue_nonrot(q) (!((q)->limits.features & BLK_FEAT_ROTATIONAL)) 638 #define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT) 639 #define blk_queue_passthrough_stat(q) \ 640 ((q)->limits.flags & BLK_FLAG_IOSTATS_PASSTHROUGH) 641 #define blk_queue_dax(q) ((q)->limits.features & BLK_FEAT_DAX) 642 #define blk_queue_pci_p2pdma(q) ((q)->limits.features & BLK_FEAT_PCI_P2PDMA) 643 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 644 #define blk_queue_rq_alloc_time(q) \ 645 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 646 #else 647 #define blk_queue_rq_alloc_time(q) false 648 #endif 649 650 #define blk_noretry_request(rq) \ 651 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 652 REQ_FAILFAST_DRIVER)) 653 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 654 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 655 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 656 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags) 657 #define blk_queue_skip_tagset_quiesce(q) \ 658 ((q)->limits.features & BLK_FEAT_SKIP_TAGSET_QUIESCE) 659 660 extern void blk_set_pm_only(struct request_queue *q); 661 extern void blk_clear_pm_only(struct request_queue *q); 662 663 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 664 665 #define dma_map_bvec(dev, bv, dir, attrs) \ 666 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 667 (dir), (attrs)) 668 669 static inline bool queue_is_mq(struct request_queue *q) 670 { 671 return q->mq_ops; 672 } 673 674 #ifdef CONFIG_PM 675 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 676 { 677 return q->rpm_status; 678 } 679 #else 680 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 681 { 682 return RPM_ACTIVE; 683 } 684 #endif 685 686 static inline bool blk_queue_is_zoned(struct request_queue *q) 687 { 688 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && 689 (q->limits.features & BLK_FEAT_ZONED); 690 } 691 692 #ifdef CONFIG_BLK_DEV_ZONED 693 static inline unsigned int disk_nr_zones(struct gendisk *disk) 694 { 695 return disk->nr_zones; 696 } 697 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs); 698 #else /* CONFIG_BLK_DEV_ZONED */ 699 static inline unsigned int disk_nr_zones(struct gendisk *disk) 700 { 701 return 0; 702 } 703 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs) 704 { 705 return false; 706 } 707 #endif /* CONFIG_BLK_DEV_ZONED */ 708 709 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) 710 { 711 if (!blk_queue_is_zoned(disk->queue)) 712 return 0; 713 return sector >> ilog2(disk->queue->limits.chunk_sectors); 714 } 715 716 static inline unsigned int bdev_nr_zones(struct block_device *bdev) 717 { 718 return disk_nr_zones(bdev->bd_disk); 719 } 720 721 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 722 { 723 return bdev->bd_disk->queue->limits.max_open_zones; 724 } 725 726 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 727 { 728 return bdev->bd_disk->queue->limits.max_active_zones; 729 } 730 731 static inline unsigned int blk_queue_depth(struct request_queue *q) 732 { 733 if (q->queue_depth) 734 return q->queue_depth; 735 736 return q->nr_requests; 737 } 738 739 /* 740 * default timeout for SG_IO if none specified 741 */ 742 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 743 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 744 745 /* This should not be used directly - use rq_for_each_segment */ 746 #define for_each_bio(_bio) \ 747 for (; _bio; _bio = _bio->bi_next) 748 749 int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk, 750 const struct attribute_group **groups, 751 struct fwnode_handle *fwnode); 752 int __must_check device_add_disk(struct device *parent, struct gendisk *disk, 753 const struct attribute_group **groups); 754 static inline int __must_check add_disk(struct gendisk *disk) 755 { 756 return device_add_disk(NULL, disk, NULL); 757 } 758 void del_gendisk(struct gendisk *gp); 759 void invalidate_disk(struct gendisk *disk); 760 void set_disk_ro(struct gendisk *disk, bool read_only); 761 void disk_uevent(struct gendisk *disk, enum kobject_action action); 762 763 static inline u8 bdev_partno(const struct block_device *bdev) 764 { 765 return atomic_read(&bdev->__bd_flags) & BD_PARTNO; 766 } 767 768 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag) 769 { 770 return atomic_read(&bdev->__bd_flags) & flag; 771 } 772 773 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag) 774 { 775 atomic_or(flag, &bdev->__bd_flags); 776 } 777 778 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag) 779 { 780 atomic_andnot(flag, &bdev->__bd_flags); 781 } 782 783 static inline bool get_disk_ro(struct gendisk *disk) 784 { 785 return bdev_test_flag(disk->part0, BD_READ_ONLY) || 786 test_bit(GD_READ_ONLY, &disk->state); 787 } 788 789 static inline bool bdev_read_only(struct block_device *bdev) 790 { 791 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk); 792 } 793 794 bool set_capacity_and_notify(struct gendisk *disk, sector_t size); 795 void disk_force_media_change(struct gendisk *disk); 796 void bdev_mark_dead(struct block_device *bdev, bool surprise); 797 798 void add_disk_randomness(struct gendisk *disk) __latent_entropy; 799 void rand_initialize_disk(struct gendisk *disk); 800 801 static inline sector_t get_start_sect(struct block_device *bdev) 802 { 803 return bdev->bd_start_sect; 804 } 805 806 static inline sector_t bdev_nr_sectors(struct block_device *bdev) 807 { 808 return bdev->bd_nr_sectors; 809 } 810 811 static inline loff_t bdev_nr_bytes(struct block_device *bdev) 812 { 813 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT; 814 } 815 816 static inline sector_t get_capacity(struct gendisk *disk) 817 { 818 return bdev_nr_sectors(disk->part0); 819 } 820 821 static inline u64 sb_bdev_nr_blocks(struct super_block *sb) 822 { 823 return bdev_nr_sectors(sb->s_bdev) >> 824 (sb->s_blocksize_bits - SECTOR_SHIFT); 825 } 826 827 int bdev_disk_changed(struct gendisk *disk, bool invalidate); 828 829 void put_disk(struct gendisk *disk); 830 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node, 831 struct lock_class_key *lkclass); 832 833 /** 834 * blk_alloc_disk - allocate a gendisk structure 835 * @lim: queue limits to be used for this disk. 836 * @node_id: numa node to allocate on 837 * 838 * Allocate and pre-initialize a gendisk structure for use with BIO based 839 * drivers. 840 * 841 * Returns an ERR_PTR on error, else the allocated disk. 842 * 843 * Context: can sleep 844 */ 845 #define blk_alloc_disk(lim, node_id) \ 846 ({ \ 847 static struct lock_class_key __key; \ 848 \ 849 __blk_alloc_disk(lim, node_id, &__key); \ 850 }) 851 852 int __register_blkdev(unsigned int major, const char *name, 853 void (*probe)(dev_t devt)); 854 #define register_blkdev(major, name) \ 855 __register_blkdev(major, name, NULL) 856 void unregister_blkdev(unsigned int major, const char *name); 857 858 bool disk_check_media_change(struct gendisk *disk); 859 void set_capacity(struct gendisk *disk, sector_t size); 860 861 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 862 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 863 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); 864 #else 865 static inline int bd_link_disk_holder(struct block_device *bdev, 866 struct gendisk *disk) 867 { 868 return 0; 869 } 870 static inline void bd_unlink_disk_holder(struct block_device *bdev, 871 struct gendisk *disk) 872 { 873 } 874 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ 875 876 dev_t part_devt(struct gendisk *disk, u8 partno); 877 void inc_diskseq(struct gendisk *disk); 878 void blk_request_module(dev_t devt); 879 880 extern int blk_register_queue(struct gendisk *disk); 881 extern void blk_unregister_queue(struct gendisk *disk); 882 void submit_bio_noacct(struct bio *bio); 883 struct bio *bio_split_to_limits(struct bio *bio); 884 885 extern int blk_lld_busy(struct request_queue *q); 886 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 887 extern void blk_queue_exit(struct request_queue *q); 888 extern void blk_sync_queue(struct request_queue *q); 889 890 /* Helper to convert REQ_OP_XXX to its string format XXX */ 891 extern const char *blk_op_str(enum req_op op); 892 893 int blk_status_to_errno(blk_status_t status); 894 blk_status_t errno_to_blk_status(int errno); 895 const char *blk_status_to_str(blk_status_t status); 896 897 /* only poll the hardware once, don't continue until a completion was found */ 898 #define BLK_POLL_ONESHOT (1 << 0) 899 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); 900 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, 901 unsigned int flags); 902 903 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 904 { 905 return bdev->bd_queue; /* this is never NULL */ 906 } 907 908 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 909 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 910 911 static inline unsigned int bio_zone_no(struct bio *bio) 912 { 913 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector); 914 } 915 916 static inline bool bio_straddles_zones(struct bio *bio) 917 { 918 return bio_sectors(bio) && 919 bio_zone_no(bio) != 920 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1); 921 } 922 923 /* 924 * Return how much within the boundary is left to be used for I/O at a given 925 * offset. 926 */ 927 static inline unsigned int blk_boundary_sectors_left(sector_t offset, 928 unsigned int boundary_sectors) 929 { 930 if (unlikely(!is_power_of_2(boundary_sectors))) 931 return boundary_sectors - sector_div(offset, boundary_sectors); 932 return boundary_sectors - (offset & (boundary_sectors - 1)); 933 } 934 935 /** 936 * queue_limits_start_update - start an atomic update of queue limits 937 * @q: queue to update 938 * 939 * This functions starts an atomic update of the queue limits. It takes a lock 940 * to prevent other updates and returns a snapshot of the current limits that 941 * the caller can modify. The caller must call queue_limits_commit_update() 942 * to finish the update. 943 * 944 * Context: process context. 945 */ 946 static inline struct queue_limits 947 queue_limits_start_update(struct request_queue *q) 948 { 949 mutex_lock(&q->limits_lock); 950 return q->limits; 951 } 952 int queue_limits_commit_update_frozen(struct request_queue *q, 953 struct queue_limits *lim); 954 int queue_limits_commit_update(struct request_queue *q, 955 struct queue_limits *lim); 956 int queue_limits_set(struct request_queue *q, struct queue_limits *lim); 957 int blk_validate_limits(struct queue_limits *lim); 958 959 /** 960 * queue_limits_cancel_update - cancel an atomic update of queue limits 961 * @q: queue to update 962 * 963 * This functions cancels an atomic update of the queue limits started by 964 * queue_limits_start_update() and should be used when an error occurs after 965 * starting update. 966 */ 967 static inline void queue_limits_cancel_update(struct request_queue *q) 968 { 969 mutex_unlock(&q->limits_lock); 970 } 971 972 /* 973 * These helpers are for drivers that have sloppy feature negotiation and might 974 * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O 975 * completion handler when the device returned an indicator that the respective 976 * feature is not actually supported. They are racy and the driver needs to 977 * cope with that. Try to avoid this scheme if you can. 978 */ 979 static inline void blk_queue_disable_discard(struct request_queue *q) 980 { 981 q->limits.max_discard_sectors = 0; 982 } 983 984 static inline void blk_queue_disable_secure_erase(struct request_queue *q) 985 { 986 q->limits.max_secure_erase_sectors = 0; 987 } 988 989 static inline void blk_queue_disable_write_zeroes(struct request_queue *q) 990 { 991 q->limits.max_write_zeroes_sectors = 0; 992 } 993 994 /* 995 * Access functions for manipulating queue properties 996 */ 997 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 998 extern void blk_set_stacking_limits(struct queue_limits *lim); 999 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 1000 sector_t offset); 1001 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, 1002 sector_t offset, const char *pfx); 1003 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 1004 1005 struct blk_independent_access_ranges * 1006 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); 1007 void disk_set_independent_access_ranges(struct gendisk *disk, 1008 struct blk_independent_access_ranges *iars); 1009 1010 bool __must_check blk_get_queue(struct request_queue *); 1011 extern void blk_put_queue(struct request_queue *); 1012 1013 void blk_mark_disk_dead(struct gendisk *disk); 1014 1015 struct rq_list { 1016 struct request *head; 1017 struct request *tail; 1018 }; 1019 1020 #ifdef CONFIG_BLOCK 1021 /* 1022 * blk_plug permits building a queue of related requests by holding the I/O 1023 * fragments for a short period. This allows merging of sequential requests 1024 * into single larger request. As the requests are moved from a per-task list to 1025 * the device's request_queue in a batch, this results in improved scalability 1026 * as the lock contention for request_queue lock is reduced. 1027 * 1028 * It is ok not to disable preemption when adding the request to the plug list 1029 * or when attempting a merge. For details, please see schedule() where 1030 * blk_flush_plug() is called. 1031 */ 1032 struct blk_plug { 1033 struct rq_list mq_list; /* blk-mq requests */ 1034 1035 /* if ios_left is > 1, we can batch tag/rq allocations */ 1036 struct rq_list cached_rqs; 1037 u64 cur_ktime; 1038 unsigned short nr_ios; 1039 1040 unsigned short rq_count; 1041 1042 bool multiple_queues; 1043 bool has_elevator; 1044 1045 struct list_head cb_list; /* md requires an unplug callback */ 1046 }; 1047 1048 struct blk_plug_cb; 1049 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1050 struct blk_plug_cb { 1051 struct list_head list; 1052 blk_plug_cb_fn callback; 1053 void *data; 1054 }; 1055 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1056 void *data, int size); 1057 extern void blk_start_plug(struct blk_plug *); 1058 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); 1059 extern void blk_finish_plug(struct blk_plug *); 1060 1061 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule); 1062 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1063 { 1064 if (plug) 1065 __blk_flush_plug(plug, async); 1066 } 1067 1068 /* 1069 * tsk == current here 1070 */ 1071 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1072 { 1073 struct blk_plug *plug = tsk->plug; 1074 1075 if (plug) 1076 plug->cur_ktime = 0; 1077 current->flags &= ~PF_BLOCK_TS; 1078 } 1079 1080 int blkdev_issue_flush(struct block_device *bdev); 1081 long nr_blockdev_pages(void); 1082 #else /* CONFIG_BLOCK */ 1083 struct blk_plug { 1084 }; 1085 1086 static inline void blk_start_plug_nr_ios(struct blk_plug *plug, 1087 unsigned short nr_ios) 1088 { 1089 } 1090 1091 static inline void blk_start_plug(struct blk_plug *plug) 1092 { 1093 } 1094 1095 static inline void blk_finish_plug(struct blk_plug *plug) 1096 { 1097 } 1098 1099 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1100 { 1101 } 1102 1103 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1104 { 1105 } 1106 1107 static inline int blkdev_issue_flush(struct block_device *bdev) 1108 { 1109 return 0; 1110 } 1111 1112 static inline long nr_blockdev_pages(void) 1113 { 1114 return 0; 1115 } 1116 #endif /* CONFIG_BLOCK */ 1117 1118 extern void blk_io_schedule(void); 1119 1120 int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1121 sector_t nr_sects, gfp_t gfp_mask); 1122 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1123 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); 1124 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, 1125 sector_t nr_sects, gfp_t gfp); 1126 1127 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1128 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1129 #define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */ 1130 1131 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1132 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1133 unsigned flags); 1134 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1135 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1136 1137 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1138 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1139 { 1140 return blkdev_issue_discard(sb->s_bdev, 1141 block << (sb->s_blocksize_bits - 1142 SECTOR_SHIFT), 1143 nr_blocks << (sb->s_blocksize_bits - 1144 SECTOR_SHIFT), 1145 gfp_mask); 1146 } 1147 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1148 sector_t nr_blocks, gfp_t gfp_mask) 1149 { 1150 return blkdev_issue_zeroout(sb->s_bdev, 1151 block << (sb->s_blocksize_bits - 1152 SECTOR_SHIFT), 1153 nr_blocks << (sb->s_blocksize_bits - 1154 SECTOR_SHIFT), 1155 gfp_mask, 0); 1156 } 1157 1158 static inline bool bdev_is_partition(struct block_device *bdev) 1159 { 1160 return bdev_partno(bdev) != 0; 1161 } 1162 1163 enum blk_default_limits { 1164 BLK_MAX_SEGMENTS = 128, 1165 BLK_SAFE_MAX_SECTORS = 255, 1166 BLK_MAX_SEGMENT_SIZE = 65536, 1167 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1168 }; 1169 1170 /* 1171 * Default upper limit for the software max_sectors limit used for 1172 * regular file system I/O. This can be increased through sysfs. 1173 * 1174 * Not to be confused with the max_hw_sector limit that is entirely 1175 * controlled by the driver, usually based on hardware limits. 1176 */ 1177 #define BLK_DEF_MAX_SECTORS_CAP 2560u 1178 1179 static inline struct queue_limits *bdev_limits(struct block_device *bdev) 1180 { 1181 return &bdev_get_queue(bdev)->limits; 1182 } 1183 1184 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1185 { 1186 return q->limits.seg_boundary_mask; 1187 } 1188 1189 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1190 { 1191 return q->limits.virt_boundary_mask; 1192 } 1193 1194 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1195 { 1196 return q->limits.max_sectors; 1197 } 1198 1199 static inline unsigned int queue_max_bytes(struct request_queue *q) 1200 { 1201 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9; 1202 } 1203 1204 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1205 { 1206 return q->limits.max_hw_sectors; 1207 } 1208 1209 static inline unsigned short queue_max_segments(const struct request_queue *q) 1210 { 1211 return q->limits.max_segments; 1212 } 1213 1214 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1215 { 1216 return q->limits.max_discard_segments; 1217 } 1218 1219 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1220 { 1221 return q->limits.max_segment_size; 1222 } 1223 1224 static inline bool queue_emulates_zone_append(struct request_queue *q) 1225 { 1226 return blk_queue_is_zoned(q) && !q->limits.max_hw_zone_append_sectors; 1227 } 1228 1229 static inline bool bdev_emulates_zone_append(struct block_device *bdev) 1230 { 1231 return queue_emulates_zone_append(bdev_get_queue(bdev)); 1232 } 1233 1234 static inline unsigned int 1235 bdev_max_zone_append_sectors(struct block_device *bdev) 1236 { 1237 return bdev_limits(bdev)->max_zone_append_sectors; 1238 } 1239 1240 static inline unsigned int bdev_max_segments(struct block_device *bdev) 1241 { 1242 return queue_max_segments(bdev_get_queue(bdev)); 1243 } 1244 1245 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1246 { 1247 return q->limits.logical_block_size; 1248 } 1249 1250 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1251 { 1252 return queue_logical_block_size(bdev_get_queue(bdev)); 1253 } 1254 1255 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1256 { 1257 return q->limits.physical_block_size; 1258 } 1259 1260 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1261 { 1262 return queue_physical_block_size(bdev_get_queue(bdev)); 1263 } 1264 1265 static inline unsigned int queue_io_min(const struct request_queue *q) 1266 { 1267 return q->limits.io_min; 1268 } 1269 1270 static inline unsigned int bdev_io_min(struct block_device *bdev) 1271 { 1272 return queue_io_min(bdev_get_queue(bdev)); 1273 } 1274 1275 static inline unsigned int queue_io_opt(const struct request_queue *q) 1276 { 1277 return q->limits.io_opt; 1278 } 1279 1280 static inline unsigned int bdev_io_opt(struct block_device *bdev) 1281 { 1282 return queue_io_opt(bdev_get_queue(bdev)); 1283 } 1284 1285 static inline unsigned int 1286 queue_zone_write_granularity(const struct request_queue *q) 1287 { 1288 return q->limits.zone_write_granularity; 1289 } 1290 1291 static inline unsigned int 1292 bdev_zone_write_granularity(struct block_device *bdev) 1293 { 1294 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1295 } 1296 1297 int bdev_alignment_offset(struct block_device *bdev); 1298 unsigned int bdev_discard_alignment(struct block_device *bdev); 1299 1300 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev) 1301 { 1302 return bdev_limits(bdev)->max_discard_sectors; 1303 } 1304 1305 static inline unsigned int bdev_discard_granularity(struct block_device *bdev) 1306 { 1307 return bdev_limits(bdev)->discard_granularity; 1308 } 1309 1310 static inline unsigned int 1311 bdev_max_secure_erase_sectors(struct block_device *bdev) 1312 { 1313 return bdev_limits(bdev)->max_secure_erase_sectors; 1314 } 1315 1316 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1317 { 1318 return bdev_limits(bdev)->max_write_zeroes_sectors; 1319 } 1320 1321 static inline bool bdev_nonrot(struct block_device *bdev) 1322 { 1323 return blk_queue_nonrot(bdev_get_queue(bdev)); 1324 } 1325 1326 static inline bool bdev_synchronous(struct block_device *bdev) 1327 { 1328 return bdev->bd_disk->queue->limits.features & BLK_FEAT_SYNCHRONOUS; 1329 } 1330 1331 static inline bool bdev_stable_writes(struct block_device *bdev) 1332 { 1333 struct request_queue *q = bdev_get_queue(bdev); 1334 1335 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) && 1336 q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE) 1337 return true; 1338 return q->limits.features & BLK_FEAT_STABLE_WRITES; 1339 } 1340 1341 static inline bool blk_queue_write_cache(struct request_queue *q) 1342 { 1343 return (q->limits.features & BLK_FEAT_WRITE_CACHE) && 1344 !(q->limits.flags & BLK_FLAG_WRITE_CACHE_DISABLED); 1345 } 1346 1347 static inline bool bdev_write_cache(struct block_device *bdev) 1348 { 1349 return blk_queue_write_cache(bdev_get_queue(bdev)); 1350 } 1351 1352 static inline bool bdev_fua(struct block_device *bdev) 1353 { 1354 return bdev_limits(bdev)->features & BLK_FEAT_FUA; 1355 } 1356 1357 static inline bool bdev_nowait(struct block_device *bdev) 1358 { 1359 return bdev->bd_disk->queue->limits.features & BLK_FEAT_NOWAIT; 1360 } 1361 1362 static inline bool bdev_is_zoned(struct block_device *bdev) 1363 { 1364 return blk_queue_is_zoned(bdev_get_queue(bdev)); 1365 } 1366 1367 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec) 1368 { 1369 return disk_zone_no(bdev->bd_disk, sec); 1370 } 1371 1372 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1373 { 1374 struct request_queue *q = bdev_get_queue(bdev); 1375 1376 if (!blk_queue_is_zoned(q)) 1377 return 0; 1378 return q->limits.chunk_sectors; 1379 } 1380 1381 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev, 1382 sector_t sector) 1383 { 1384 return sector & (bdev_zone_sectors(bdev) - 1); 1385 } 1386 1387 static inline sector_t bio_offset_from_zone_start(struct bio *bio) 1388 { 1389 return bdev_offset_from_zone_start(bio->bi_bdev, 1390 bio->bi_iter.bi_sector); 1391 } 1392 1393 static inline bool bdev_is_zone_start(struct block_device *bdev, 1394 sector_t sector) 1395 { 1396 return bdev_offset_from_zone_start(bdev, sector) == 0; 1397 } 1398 1399 /** 1400 * bdev_zone_is_seq - check if a sector belongs to a sequential write zone 1401 * @bdev: block device to check 1402 * @sector: sector number 1403 * 1404 * Check if @sector on @bdev is contained in a sequential write required zone. 1405 */ 1406 static inline bool bdev_zone_is_seq(struct block_device *bdev, sector_t sector) 1407 { 1408 bool is_seq = false; 1409 1410 #if IS_ENABLED(CONFIG_BLK_DEV_ZONED) 1411 if (bdev_is_zoned(bdev)) { 1412 struct gendisk *disk = bdev->bd_disk; 1413 unsigned long *bitmap; 1414 1415 rcu_read_lock(); 1416 bitmap = rcu_dereference(disk->conv_zones_bitmap); 1417 is_seq = !bitmap || 1418 !test_bit(disk_zone_no(disk, sector), bitmap); 1419 rcu_read_unlock(); 1420 } 1421 #endif 1422 1423 return is_seq; 1424 } 1425 1426 int blk_zone_issue_zeroout(struct block_device *bdev, sector_t sector, 1427 sector_t nr_sects, gfp_t gfp_mask); 1428 1429 static inline unsigned int queue_dma_alignment(const struct request_queue *q) 1430 { 1431 return q->limits.dma_alignment; 1432 } 1433 1434 static inline unsigned int 1435 queue_atomic_write_unit_max_bytes(const struct request_queue *q) 1436 { 1437 return q->limits.atomic_write_unit_max; 1438 } 1439 1440 static inline unsigned int 1441 queue_atomic_write_unit_min_bytes(const struct request_queue *q) 1442 { 1443 return q->limits.atomic_write_unit_min; 1444 } 1445 1446 static inline unsigned int 1447 queue_atomic_write_boundary_bytes(const struct request_queue *q) 1448 { 1449 return q->limits.atomic_write_boundary_sectors << SECTOR_SHIFT; 1450 } 1451 1452 static inline unsigned int 1453 queue_atomic_write_max_bytes(const struct request_queue *q) 1454 { 1455 return q->limits.atomic_write_max_sectors << SECTOR_SHIFT; 1456 } 1457 1458 static inline unsigned int bdev_dma_alignment(struct block_device *bdev) 1459 { 1460 return queue_dma_alignment(bdev_get_queue(bdev)); 1461 } 1462 1463 static inline bool bdev_iter_is_aligned(struct block_device *bdev, 1464 struct iov_iter *iter) 1465 { 1466 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev), 1467 bdev_logical_block_size(bdev) - 1); 1468 } 1469 1470 static inline unsigned int 1471 blk_lim_dma_alignment_and_pad(struct queue_limits *lim) 1472 { 1473 return lim->dma_alignment | lim->dma_pad_mask; 1474 } 1475 1476 static inline bool blk_rq_aligned(struct request_queue *q, unsigned long addr, 1477 unsigned int len) 1478 { 1479 unsigned int alignment = blk_lim_dma_alignment_and_pad(&q->limits); 1480 1481 return !(addr & alignment) && !(len & alignment); 1482 } 1483 1484 /* assumes size > 256 */ 1485 static inline unsigned int blksize_bits(unsigned int size) 1486 { 1487 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT; 1488 } 1489 1490 int kblockd_schedule_work(struct work_struct *work); 1491 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1492 1493 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1494 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1495 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1496 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1497 1498 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1499 1500 bool blk_crypto_register(struct blk_crypto_profile *profile, 1501 struct request_queue *q); 1502 1503 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1504 1505 static inline bool blk_crypto_register(struct blk_crypto_profile *profile, 1506 struct request_queue *q) 1507 { 1508 return true; 1509 } 1510 1511 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1512 1513 enum blk_unique_id { 1514 /* these match the Designator Types specified in SPC */ 1515 BLK_UID_T10 = 1, 1516 BLK_UID_EUI64 = 2, 1517 BLK_UID_NAA = 3, 1518 }; 1519 1520 struct block_device_operations { 1521 void (*submit_bio)(struct bio *bio); 1522 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob, 1523 unsigned int flags); 1524 int (*open)(struct gendisk *disk, blk_mode_t mode); 1525 void (*release)(struct gendisk *disk); 1526 int (*ioctl)(struct block_device *bdev, blk_mode_t mode, 1527 unsigned cmd, unsigned long arg); 1528 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode, 1529 unsigned cmd, unsigned long arg); 1530 unsigned int (*check_events) (struct gendisk *disk, 1531 unsigned int clearing); 1532 void (*unlock_native_capacity) (struct gendisk *); 1533 int (*getgeo)(struct block_device *, struct hd_geometry *); 1534 int (*set_read_only)(struct block_device *bdev, bool ro); 1535 void (*free_disk)(struct gendisk *disk); 1536 /* this callback is with swap_lock and sometimes page table lock held */ 1537 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1538 int (*report_zones)(struct gendisk *, sector_t sector, 1539 unsigned int nr_zones, report_zones_cb cb, void *data); 1540 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1541 /* returns the length of the identifier or a negative errno: */ 1542 int (*get_unique_id)(struct gendisk *disk, u8 id[16], 1543 enum blk_unique_id id_type); 1544 struct module *owner; 1545 const struct pr_ops *pr_ops; 1546 1547 /* 1548 * Special callback for probing GPT entry at a given sector. 1549 * Needed by Android devices, used by GPT scanner and MMC blk 1550 * driver. 1551 */ 1552 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector); 1553 }; 1554 1555 #ifdef CONFIG_COMPAT 1556 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t, 1557 unsigned int, unsigned long); 1558 #else 1559 #define blkdev_compat_ptr_ioctl NULL 1560 #endif 1561 1562 static inline void blk_wake_io_task(struct task_struct *waiter) 1563 { 1564 /* 1565 * If we're polling, the task itself is doing the completions. For 1566 * that case, we don't need to signal a wakeup, it's enough to just 1567 * mark us as RUNNING. 1568 */ 1569 if (waiter == current) 1570 __set_current_state(TASK_RUNNING); 1571 else 1572 wake_up_process(waiter); 1573 } 1574 1575 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op, 1576 unsigned long start_time); 1577 void bdev_end_io_acct(struct block_device *bdev, enum req_op op, 1578 unsigned int sectors, unsigned long start_time); 1579 1580 unsigned long bio_start_io_acct(struct bio *bio); 1581 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1582 struct block_device *orig_bdev); 1583 1584 /** 1585 * bio_end_io_acct - end I/O accounting for bio based drivers 1586 * @bio: bio to end account for 1587 * @start_time: start time returned by bio_start_io_acct() 1588 */ 1589 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1590 { 1591 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1592 } 1593 1594 int set_blocksize(struct file *file, int size); 1595 1596 int lookup_bdev(const char *pathname, dev_t *dev); 1597 1598 void blkdev_show(struct seq_file *seqf, off_t offset); 1599 1600 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1601 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1602 #ifdef CONFIG_BLOCK 1603 #define BLKDEV_MAJOR_MAX 512 1604 #else 1605 #define BLKDEV_MAJOR_MAX 0 1606 #endif 1607 1608 struct blk_holder_ops { 1609 void (*mark_dead)(struct block_device *bdev, bool surprise); 1610 1611 /* 1612 * Sync the file system mounted on the block device. 1613 */ 1614 void (*sync)(struct block_device *bdev); 1615 1616 /* 1617 * Freeze the file system mounted on the block device. 1618 */ 1619 int (*freeze)(struct block_device *bdev); 1620 1621 /* 1622 * Thaw the file system mounted on the block device. 1623 */ 1624 int (*thaw)(struct block_device *bdev); 1625 }; 1626 1627 /* 1628 * For filesystems using @fs_holder_ops, the @holder argument passed to 1629 * helpers used to open and claim block devices via 1630 * bd_prepare_to_claim() must point to a superblock. 1631 */ 1632 extern const struct blk_holder_ops fs_holder_ops; 1633 1634 /* 1635 * Return the correct open flags for blkdev_get_by_* for super block flags 1636 * as stored in sb->s_flags. 1637 */ 1638 #define sb_open_mode(flags) \ 1639 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \ 1640 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE)) 1641 1642 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, 1643 const struct blk_holder_ops *hops); 1644 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode, 1645 void *holder, const struct blk_holder_ops *hops); 1646 int bd_prepare_to_claim(struct block_device *bdev, void *holder, 1647 const struct blk_holder_ops *hops); 1648 void bd_abort_claiming(struct block_device *bdev, void *holder); 1649 1650 /* just for blk-cgroup, don't use elsewhere */ 1651 struct block_device *blkdev_get_no_open(dev_t dev); 1652 void blkdev_put_no_open(struct block_device *bdev); 1653 1654 struct block_device *I_BDEV(struct inode *inode); 1655 struct block_device *file_bdev(struct file *bdev_file); 1656 bool disk_live(struct gendisk *disk); 1657 unsigned int block_size(struct block_device *bdev); 1658 1659 #ifdef CONFIG_BLOCK 1660 void invalidate_bdev(struct block_device *bdev); 1661 int sync_blockdev(struct block_device *bdev); 1662 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); 1663 int sync_blockdev_nowait(struct block_device *bdev); 1664 void sync_bdevs(bool wait); 1665 void bdev_statx(struct path *, struct kstat *, u32); 1666 void printk_all_partitions(void); 1667 int __init early_lookup_bdev(const char *pathname, dev_t *dev); 1668 #else 1669 static inline void invalidate_bdev(struct block_device *bdev) 1670 { 1671 } 1672 static inline int sync_blockdev(struct block_device *bdev) 1673 { 1674 return 0; 1675 } 1676 static inline int sync_blockdev_nowait(struct block_device *bdev) 1677 { 1678 return 0; 1679 } 1680 static inline void sync_bdevs(bool wait) 1681 { 1682 } 1683 static inline void bdev_statx(struct path *path, struct kstat *stat, 1684 u32 request_mask) 1685 { 1686 } 1687 static inline void printk_all_partitions(void) 1688 { 1689 } 1690 static inline int early_lookup_bdev(const char *pathname, dev_t *dev) 1691 { 1692 return -EINVAL; 1693 } 1694 #endif /* CONFIG_BLOCK */ 1695 1696 int bdev_freeze(struct block_device *bdev); 1697 int bdev_thaw(struct block_device *bdev); 1698 void bdev_fput(struct file *bdev_file); 1699 1700 struct io_comp_batch { 1701 struct rq_list req_list; 1702 bool need_ts; 1703 void (*complete)(struct io_comp_batch *); 1704 }; 1705 1706 static inline bool blk_atomic_write_start_sect_aligned(sector_t sector, 1707 struct queue_limits *limits) 1708 { 1709 unsigned int alignment = max(limits->atomic_write_hw_unit_min, 1710 limits->atomic_write_hw_boundary); 1711 1712 return IS_ALIGNED(sector, alignment >> SECTOR_SHIFT); 1713 } 1714 1715 static inline bool bdev_can_atomic_write(struct block_device *bdev) 1716 { 1717 struct request_queue *bd_queue = bdev->bd_queue; 1718 struct queue_limits *limits = &bd_queue->limits; 1719 1720 if (!limits->atomic_write_unit_min) 1721 return false; 1722 1723 if (bdev_is_partition(bdev)) 1724 return blk_atomic_write_start_sect_aligned(bdev->bd_start_sect, 1725 limits); 1726 1727 return true; 1728 } 1729 1730 static inline unsigned int 1731 bdev_atomic_write_unit_min_bytes(struct block_device *bdev) 1732 { 1733 if (!bdev_can_atomic_write(bdev)) 1734 return 0; 1735 return queue_atomic_write_unit_min_bytes(bdev_get_queue(bdev)); 1736 } 1737 1738 static inline unsigned int 1739 bdev_atomic_write_unit_max_bytes(struct block_device *bdev) 1740 { 1741 if (!bdev_can_atomic_write(bdev)) 1742 return 0; 1743 return queue_atomic_write_unit_max_bytes(bdev_get_queue(bdev)); 1744 } 1745 1746 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } 1747 1748 #endif /* _LINUX_BLKDEV_H */ 1749