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 29 struct module; 30 struct request_queue; 31 struct elevator_queue; 32 struct blk_trace; 33 struct request; 34 struct sg_io_hdr; 35 struct blkcg_gq; 36 struct blk_flush_queue; 37 struct kiocb; 38 struct pr_ops; 39 struct rq_qos; 40 struct blk_queue_stats; 41 struct blk_stat_callback; 42 struct blk_crypto_profile; 43 44 extern const struct device_type disk_type; 45 extern const struct device_type part_type; 46 extern const struct class block_class; 47 48 /* 49 * Maximum number of blkcg policies allowed to be registered concurrently. 50 * Defined here to simplify include dependency. 51 */ 52 #define BLKCG_MAX_POLS 6 53 54 #define DISK_MAX_PARTS 256 55 #define DISK_NAME_LEN 32 56 57 #define PARTITION_META_INFO_VOLNAMELTH 64 58 /* 59 * Enough for the string representation of any kind of UUID plus NULL. 60 * EFI UUID is 36 characters. MSDOS UUID is 11 characters. 61 */ 62 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) 63 64 struct partition_meta_info { 65 char uuid[PARTITION_META_INFO_UUIDLTH]; 66 u8 volname[PARTITION_META_INFO_VOLNAMELTH]; 67 }; 68 69 /** 70 * DOC: genhd capability flags 71 * 72 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to 73 * removable media. When set, the device remains present even when media is not 74 * inserted. Shall not be set for devices which are removed entirely when the 75 * media is removed. 76 * 77 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events, 78 * doesn't appear in sysfs, and can't be opened from userspace or using 79 * blkdev_get*. Used for the underlying components of multipath devices. 80 * 81 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not 82 * scan for partitions from add_disk, and users can't add partitions manually. 83 * 84 */ 85 enum { 86 GENHD_FL_REMOVABLE = 1 << 0, 87 GENHD_FL_HIDDEN = 1 << 1, 88 GENHD_FL_NO_PART = 1 << 2, 89 }; 90 91 enum { 92 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ 93 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ 94 }; 95 96 enum { 97 /* Poll even if events_poll_msecs is unset */ 98 DISK_EVENT_FLAG_POLL = 1 << 0, 99 /* Forward events to udev */ 100 DISK_EVENT_FLAG_UEVENT = 1 << 1, 101 /* Block event polling when open for exclusive write */ 102 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2, 103 }; 104 105 struct disk_events; 106 struct badblocks; 107 108 struct blk_integrity { 109 const struct blk_integrity_profile *profile; 110 unsigned char flags; 111 unsigned char tuple_size; 112 unsigned char pi_offset; 113 unsigned char interval_exp; 114 unsigned char tag_size; 115 }; 116 117 typedef unsigned int __bitwise blk_mode_t; 118 119 /* open for reading */ 120 #define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0)) 121 /* open for writing */ 122 #define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1)) 123 /* open exclusively (vs other exclusive openers */ 124 #define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2)) 125 /* opened with O_NDELAY */ 126 #define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3)) 127 /* open for "writes" only for ioctls (specialy hack for floppy.c) */ 128 #define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4)) 129 /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */ 130 #define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5)) 131 /* return partition scanning errors */ 132 #define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6)) 133 134 struct gendisk { 135 /* 136 * major/first_minor/minors should not be set by any new driver, the 137 * block core will take care of allocating them automatically. 138 */ 139 int major; 140 int first_minor; 141 int minors; 142 143 char disk_name[DISK_NAME_LEN]; /* name of major driver */ 144 145 unsigned short events; /* supported events */ 146 unsigned short event_flags; /* flags related to event processing */ 147 148 struct xarray part_tbl; 149 struct block_device *part0; 150 151 const struct block_device_operations *fops; 152 struct request_queue *queue; 153 void *private_data; 154 155 struct bio_set bio_split; 156 157 int flags; 158 unsigned long state; 159 #define GD_NEED_PART_SCAN 0 160 #define GD_READ_ONLY 1 161 #define GD_DEAD 2 162 #define GD_NATIVE_CAPACITY 3 163 #define GD_ADDED 4 164 #define GD_SUPPRESS_PART_SCAN 5 165 #define GD_OWNS_QUEUE 6 166 167 struct mutex open_mutex; /* open/close mutex */ 168 unsigned open_partitions; /* number of open partitions */ 169 170 struct backing_dev_info *bdi; 171 struct kobject queue_kobj; /* the queue/ directory */ 172 struct kobject *slave_dir; 173 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 174 struct list_head slave_bdevs; 175 #endif 176 struct timer_rand_state *random; 177 atomic_t sync_io; /* RAID */ 178 struct disk_events *ev; 179 180 #ifdef CONFIG_BLK_DEV_ZONED 181 /* 182 * Zoned block device information. Reads of this information must be 183 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this 184 * information is only allowed while no requests are being processed. 185 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue(). 186 */ 187 unsigned int nr_zones; 188 unsigned int zone_capacity; 189 unsigned long *conv_zones_bitmap; 190 unsigned int zone_wplugs_hash_bits; 191 spinlock_t zone_wplugs_lock; 192 struct mempool_s *zone_wplugs_pool; 193 struct hlist_head *zone_wplugs_hash; 194 struct list_head zone_wplugs_err_list; 195 struct work_struct zone_wplugs_work; 196 struct workqueue_struct *zone_wplugs_wq; 197 #endif /* CONFIG_BLK_DEV_ZONED */ 198 199 #if IS_ENABLED(CONFIG_CDROM) 200 struct cdrom_device_info *cdi; 201 #endif 202 int node_id; 203 struct badblocks *bb; 204 struct lockdep_map lockdep_map; 205 u64 diskseq; 206 blk_mode_t open_mode; 207 208 /* 209 * Independent sector access ranges. This is always NULL for 210 * devices that do not have multiple independent access ranges. 211 */ 212 struct blk_independent_access_ranges *ia_ranges; 213 }; 214 215 /** 216 * disk_openers - returns how many openers are there for a disk 217 * @disk: disk to check 218 * 219 * This returns the number of openers for a disk. Note that this value is only 220 * stable if disk->open_mutex is held. 221 * 222 * Note: Due to a quirk in the block layer open code, each open partition is 223 * only counted once even if there are multiple openers. 224 */ 225 static inline unsigned int disk_openers(struct gendisk *disk) 226 { 227 return atomic_read(&disk->part0->bd_openers); 228 } 229 230 /** 231 * disk_has_partscan - return %true if partition scanning is enabled on a disk 232 * @disk: disk to check 233 * 234 * Returns %true if partitions scanning is enabled for @disk, or %false if 235 * partition scanning is disabled either permanently or temporarily. 236 */ 237 static inline bool disk_has_partscan(struct gendisk *disk) 238 { 239 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) && 240 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state); 241 } 242 243 /* 244 * The gendisk is refcounted by the part0 block_device, and the bd_device 245 * therein is also used for device model presentation in sysfs. 246 */ 247 #define dev_to_disk(device) \ 248 (dev_to_bdev(device)->bd_disk) 249 #define disk_to_dev(disk) \ 250 (&((disk)->part0->bd_device)) 251 252 #if IS_REACHABLE(CONFIG_CDROM) 253 #define disk_to_cdi(disk) ((disk)->cdi) 254 #else 255 #define disk_to_cdi(disk) NULL 256 #endif 257 258 static inline dev_t disk_devt(struct gendisk *disk) 259 { 260 return MKDEV(disk->major, disk->first_minor); 261 } 262 263 static inline int blk_validate_block_size(unsigned long bsize) 264 { 265 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) 266 return -EINVAL; 267 268 return 0; 269 } 270 271 static inline bool blk_op_is_passthrough(blk_opf_t op) 272 { 273 op &= REQ_OP_MASK; 274 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 275 } 276 277 /* 278 * BLK_BOUNCE_NONE: never bounce (default) 279 * BLK_BOUNCE_HIGH: bounce all highmem pages 280 */ 281 enum blk_bounce { 282 BLK_BOUNCE_NONE, 283 BLK_BOUNCE_HIGH, 284 }; 285 286 struct queue_limits { 287 enum blk_bounce bounce; 288 unsigned long seg_boundary_mask; 289 unsigned long virt_boundary_mask; 290 291 unsigned int max_hw_sectors; 292 unsigned int max_dev_sectors; 293 unsigned int chunk_sectors; 294 unsigned int max_sectors; 295 unsigned int max_user_sectors; 296 unsigned int max_segment_size; 297 unsigned int physical_block_size; 298 unsigned int logical_block_size; 299 unsigned int alignment_offset; 300 unsigned int io_min; 301 unsigned int io_opt; 302 unsigned int max_discard_sectors; 303 unsigned int max_hw_discard_sectors; 304 unsigned int max_user_discard_sectors; 305 unsigned int max_secure_erase_sectors; 306 unsigned int max_write_zeroes_sectors; 307 unsigned int max_zone_append_sectors; 308 unsigned int discard_granularity; 309 unsigned int discard_alignment; 310 unsigned int zone_write_granularity; 311 312 unsigned short max_segments; 313 unsigned short max_integrity_segments; 314 unsigned short max_discard_segments; 315 316 unsigned char misaligned; 317 unsigned char discard_misaligned; 318 unsigned char raid_partial_stripes_expensive; 319 bool zoned; 320 unsigned int max_open_zones; 321 unsigned int max_active_zones; 322 323 /* 324 * Drivers that set dma_alignment to less than 511 must be prepared to 325 * handle individual bvec's that are not a multiple of a SECTOR_SIZE 326 * due to possible offsets. 327 */ 328 unsigned int dma_alignment; 329 }; 330 331 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 332 void *data); 333 334 void disk_set_zoned(struct gendisk *disk); 335 336 #define BLK_ALL_ZONES ((unsigned int)-1) 337 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 338 unsigned int nr_zones, report_zones_cb cb, void *data); 339 int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op, 340 sector_t sectors, sector_t nr_sectors); 341 int blk_revalidate_disk_zones(struct gendisk *disk); 342 343 /* 344 * Independent access ranges: struct blk_independent_access_range describes 345 * a range of contiguous sectors that can be accessed using device command 346 * execution resources that are independent from the resources used for 347 * other access ranges. This is typically found with single-LUN multi-actuator 348 * HDDs where each access range is served by a different set of heads. 349 * The set of independent ranges supported by the device is defined using 350 * struct blk_independent_access_ranges. The independent ranges must not overlap 351 * and must include all sectors within the disk capacity (no sector holes 352 * allowed). 353 * For a device with multiple ranges, requests targeting sectors in different 354 * ranges can be executed in parallel. A request can straddle an access range 355 * boundary. 356 */ 357 struct blk_independent_access_range { 358 struct kobject kobj; 359 sector_t sector; 360 sector_t nr_sectors; 361 }; 362 363 struct blk_independent_access_ranges { 364 struct kobject kobj; 365 bool sysfs_registered; 366 unsigned int nr_ia_ranges; 367 struct blk_independent_access_range ia_range[]; 368 }; 369 370 struct request_queue { 371 /* 372 * The queue owner gets to use this for whatever they like. 373 * ll_rw_blk doesn't touch it. 374 */ 375 void *queuedata; 376 377 struct elevator_queue *elevator; 378 379 const struct blk_mq_ops *mq_ops; 380 381 /* sw queues */ 382 struct blk_mq_ctx __percpu *queue_ctx; 383 384 /* 385 * various queue flags, see QUEUE_* below 386 */ 387 unsigned long queue_flags; 388 389 unsigned int rq_timeout; 390 391 unsigned int queue_depth; 392 393 refcount_t refs; 394 395 /* hw dispatch queues */ 396 unsigned int nr_hw_queues; 397 struct xarray hctx_table; 398 399 struct percpu_ref q_usage_counter; 400 401 struct request *last_merge; 402 403 spinlock_t queue_lock; 404 405 int quiesce_depth; 406 407 struct gendisk *disk; 408 409 /* 410 * mq queue kobject 411 */ 412 struct kobject *mq_kobj; 413 414 struct queue_limits limits; 415 416 #ifdef CONFIG_BLK_DEV_INTEGRITY 417 struct blk_integrity integrity; 418 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 419 420 #ifdef CONFIG_PM 421 struct device *dev; 422 enum rpm_status rpm_status; 423 #endif 424 425 /* 426 * Number of contexts that have called blk_set_pm_only(). If this 427 * counter is above zero then only RQF_PM requests are processed. 428 */ 429 atomic_t pm_only; 430 431 struct blk_queue_stats *stats; 432 struct rq_qos *rq_qos; 433 struct mutex rq_qos_mutex; 434 435 /* 436 * ida allocated id for this queue. Used to index queues from 437 * ioctx. 438 */ 439 int id; 440 441 unsigned int dma_pad_mask; 442 443 /* 444 * queue settings 445 */ 446 unsigned long nr_requests; /* Max # of requests */ 447 448 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 449 struct blk_crypto_profile *crypto_profile; 450 struct kobject *crypto_kobject; 451 #endif 452 453 struct timer_list timeout; 454 struct work_struct timeout_work; 455 456 atomic_t nr_active_requests_shared_tags; 457 458 struct blk_mq_tags *sched_shared_tags; 459 460 struct list_head icq_list; 461 #ifdef CONFIG_BLK_CGROUP 462 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 463 struct blkcg_gq *root_blkg; 464 struct list_head blkg_list; 465 struct mutex blkcg_mutex; 466 #endif 467 468 int node; 469 470 spinlock_t requeue_lock; 471 struct list_head requeue_list; 472 struct delayed_work requeue_work; 473 474 #ifdef CONFIG_BLK_DEV_IO_TRACE 475 struct blk_trace __rcu *blk_trace; 476 #endif 477 /* 478 * for flush operations 479 */ 480 struct blk_flush_queue *fq; 481 struct list_head flush_list; 482 483 struct mutex sysfs_lock; 484 struct mutex sysfs_dir_lock; 485 struct mutex limits_lock; 486 487 /* 488 * for reusing dead hctx instance in case of updating 489 * nr_hw_queues 490 */ 491 struct list_head unused_hctx_list; 492 spinlock_t unused_hctx_lock; 493 494 int mq_freeze_depth; 495 496 #ifdef CONFIG_BLK_DEV_THROTTLING 497 /* Throttle data */ 498 struct throtl_data *td; 499 #endif 500 struct rcu_head rcu_head; 501 wait_queue_head_t mq_freeze_wq; 502 /* 503 * Protect concurrent access to q_usage_counter by 504 * percpu_ref_kill() and percpu_ref_reinit(). 505 */ 506 struct mutex mq_freeze_lock; 507 508 struct blk_mq_tag_set *tag_set; 509 struct list_head tag_set_list; 510 511 struct dentry *debugfs_dir; 512 struct dentry *sched_debugfs_dir; 513 struct dentry *rqos_debugfs_dir; 514 /* 515 * Serializes all debugfs metadata operations using the above dentries. 516 */ 517 struct mutex debugfs_mutex; 518 519 bool mq_sysfs_init_done; 520 }; 521 522 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 523 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 524 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 525 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 526 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 527 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 528 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 529 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 530 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 531 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 532 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 533 #define QUEUE_FLAG_SYNCHRONOUS 11 /* always completes in submit context */ 534 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 535 #define QUEUE_FLAG_HW_WC 13 /* Write back caching supported */ 536 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 537 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 538 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 539 #define QUEUE_FLAG_WC 17 /* Write back caching */ 540 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 541 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 542 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 543 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 544 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 545 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 546 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 547 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 548 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 549 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 550 #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */ 551 #define QUEUE_FLAG_SKIP_TAGSET_QUIESCE 31 /* quiesce_tagset skip the queue*/ 552 553 #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \ 554 (1UL << QUEUE_FLAG_SAME_COMP) | \ 555 (1UL << QUEUE_FLAG_NOWAIT)) 556 557 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 558 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 559 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 560 561 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 562 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 563 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 564 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 565 #define blk_queue_noxmerges(q) \ 566 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 567 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 568 #define blk_queue_stable_writes(q) \ 569 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 570 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 571 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 572 #define blk_queue_zone_resetall(q) \ 573 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 574 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 575 #define blk_queue_pci_p2pdma(q) \ 576 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 577 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 578 #define blk_queue_rq_alloc_time(q) \ 579 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 580 #else 581 #define blk_queue_rq_alloc_time(q) false 582 #endif 583 584 #define blk_noretry_request(rq) \ 585 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 586 REQ_FAILFAST_DRIVER)) 587 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 588 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 589 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 590 #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags) 591 #define blk_queue_skip_tagset_quiesce(q) \ 592 test_bit(QUEUE_FLAG_SKIP_TAGSET_QUIESCE, &(q)->queue_flags) 593 594 extern void blk_set_pm_only(struct request_queue *q); 595 extern void blk_clear_pm_only(struct request_queue *q); 596 597 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 598 599 #define dma_map_bvec(dev, bv, dir, attrs) \ 600 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 601 (dir), (attrs)) 602 603 static inline bool queue_is_mq(struct request_queue *q) 604 { 605 return q->mq_ops; 606 } 607 608 #ifdef CONFIG_PM 609 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 610 { 611 return q->rpm_status; 612 } 613 #else 614 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 615 { 616 return RPM_ACTIVE; 617 } 618 #endif 619 620 static inline bool blk_queue_is_zoned(struct request_queue *q) 621 { 622 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) && q->limits.zoned; 623 } 624 625 #ifdef CONFIG_BLK_DEV_ZONED 626 unsigned int bdev_nr_zones(struct block_device *bdev); 627 628 static inline unsigned int disk_nr_zones(struct gendisk *disk) 629 { 630 return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0; 631 } 632 633 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) 634 { 635 if (!blk_queue_is_zoned(disk->queue)) 636 return 0; 637 return sector >> ilog2(disk->queue->limits.chunk_sectors); 638 } 639 640 static inline void disk_set_max_open_zones(struct gendisk *disk, 641 unsigned int max_open_zones) 642 { 643 disk->queue->limits.max_open_zones = max_open_zones; 644 } 645 646 static inline void disk_set_max_active_zones(struct gendisk *disk, 647 unsigned int max_active_zones) 648 { 649 disk->queue->limits.max_active_zones = max_active_zones; 650 } 651 652 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 653 { 654 return bdev->bd_disk->queue->limits.max_open_zones; 655 } 656 657 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 658 { 659 return bdev->bd_disk->queue->limits.max_active_zones; 660 } 661 662 bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs); 663 #else /* CONFIG_BLK_DEV_ZONED */ 664 static inline unsigned int bdev_nr_zones(struct block_device *bdev) 665 { 666 return 0; 667 } 668 669 static inline unsigned int disk_nr_zones(struct gendisk *disk) 670 { 671 return 0; 672 } 673 static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) 674 { 675 return 0; 676 } 677 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 678 { 679 return 0; 680 } 681 682 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 683 { 684 return 0; 685 } 686 static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs) 687 { 688 return false; 689 } 690 #endif /* CONFIG_BLK_DEV_ZONED */ 691 692 static inline unsigned int blk_queue_depth(struct request_queue *q) 693 { 694 if (q->queue_depth) 695 return q->queue_depth; 696 697 return q->nr_requests; 698 } 699 700 /* 701 * default timeout for SG_IO if none specified 702 */ 703 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 704 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 705 706 /* This should not be used directly - use rq_for_each_segment */ 707 #define for_each_bio(_bio) \ 708 for (; _bio; _bio = _bio->bi_next) 709 710 int __must_check device_add_disk(struct device *parent, struct gendisk *disk, 711 const struct attribute_group **groups); 712 static inline int __must_check add_disk(struct gendisk *disk) 713 { 714 return device_add_disk(NULL, disk, NULL); 715 } 716 void del_gendisk(struct gendisk *gp); 717 void invalidate_disk(struct gendisk *disk); 718 void set_disk_ro(struct gendisk *disk, bool read_only); 719 void disk_uevent(struct gendisk *disk, enum kobject_action action); 720 721 static inline u8 bdev_partno(const struct block_device *bdev) 722 { 723 return atomic_read(&bdev->__bd_flags) & BD_PARTNO; 724 } 725 726 static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag) 727 { 728 return atomic_read(&bdev->__bd_flags) & flag; 729 } 730 731 static inline void bdev_set_flag(struct block_device *bdev, unsigned flag) 732 { 733 atomic_or(flag, &bdev->__bd_flags); 734 } 735 736 static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag) 737 { 738 atomic_andnot(flag, &bdev->__bd_flags); 739 } 740 741 static inline int get_disk_ro(struct gendisk *disk) 742 { 743 return bdev_test_flag(disk->part0, BD_READ_ONLY) || 744 test_bit(GD_READ_ONLY, &disk->state); 745 } 746 747 static inline int bdev_read_only(struct block_device *bdev) 748 { 749 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk); 750 } 751 752 bool set_capacity_and_notify(struct gendisk *disk, sector_t size); 753 void disk_force_media_change(struct gendisk *disk); 754 void bdev_mark_dead(struct block_device *bdev, bool surprise); 755 756 void add_disk_randomness(struct gendisk *disk) __latent_entropy; 757 void rand_initialize_disk(struct gendisk *disk); 758 759 static inline sector_t get_start_sect(struct block_device *bdev) 760 { 761 return bdev->bd_start_sect; 762 } 763 764 static inline sector_t bdev_nr_sectors(struct block_device *bdev) 765 { 766 return bdev->bd_nr_sectors; 767 } 768 769 static inline loff_t bdev_nr_bytes(struct block_device *bdev) 770 { 771 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT; 772 } 773 774 static inline sector_t get_capacity(struct gendisk *disk) 775 { 776 return bdev_nr_sectors(disk->part0); 777 } 778 779 static inline u64 sb_bdev_nr_blocks(struct super_block *sb) 780 { 781 return bdev_nr_sectors(sb->s_bdev) >> 782 (sb->s_blocksize_bits - SECTOR_SHIFT); 783 } 784 785 int bdev_disk_changed(struct gendisk *disk, bool invalidate); 786 787 void put_disk(struct gendisk *disk); 788 struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node, 789 struct lock_class_key *lkclass); 790 791 /** 792 * blk_alloc_disk - allocate a gendisk structure 793 * @lim: queue limits to be used for this disk. 794 * @node_id: numa node to allocate on 795 * 796 * Allocate and pre-initialize a gendisk structure for use with BIO based 797 * drivers. 798 * 799 * Returns an ERR_PTR on error, else the allocated disk. 800 * 801 * Context: can sleep 802 */ 803 #define blk_alloc_disk(lim, node_id) \ 804 ({ \ 805 static struct lock_class_key __key; \ 806 \ 807 __blk_alloc_disk(lim, node_id, &__key); \ 808 }) 809 810 int __register_blkdev(unsigned int major, const char *name, 811 void (*probe)(dev_t devt)); 812 #define register_blkdev(major, name) \ 813 __register_blkdev(major, name, NULL) 814 void unregister_blkdev(unsigned int major, const char *name); 815 816 bool disk_check_media_change(struct gendisk *disk); 817 void set_capacity(struct gendisk *disk, sector_t size); 818 819 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 820 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 821 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); 822 #else 823 static inline int bd_link_disk_holder(struct block_device *bdev, 824 struct gendisk *disk) 825 { 826 return 0; 827 } 828 static inline void bd_unlink_disk_holder(struct block_device *bdev, 829 struct gendisk *disk) 830 { 831 } 832 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ 833 834 dev_t part_devt(struct gendisk *disk, u8 partno); 835 void inc_diskseq(struct gendisk *disk); 836 void blk_request_module(dev_t devt); 837 838 extern int blk_register_queue(struct gendisk *disk); 839 extern void blk_unregister_queue(struct gendisk *disk); 840 void submit_bio_noacct(struct bio *bio); 841 struct bio *bio_split_to_limits(struct bio *bio); 842 843 extern int blk_lld_busy(struct request_queue *q); 844 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 845 extern void blk_queue_exit(struct request_queue *q); 846 extern void blk_sync_queue(struct request_queue *q); 847 848 /* Helper to convert REQ_OP_XXX to its string format XXX */ 849 extern const char *blk_op_str(enum req_op op); 850 851 int blk_status_to_errno(blk_status_t status); 852 blk_status_t errno_to_blk_status(int errno); 853 const char *blk_status_to_str(blk_status_t status); 854 855 /* only poll the hardware once, don't continue until a completion was found */ 856 #define BLK_POLL_ONESHOT (1 << 0) 857 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); 858 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, 859 unsigned int flags); 860 861 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 862 { 863 return bdev->bd_queue; /* this is never NULL */ 864 } 865 866 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 867 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 868 869 static inline unsigned int bio_zone_no(struct bio *bio) 870 { 871 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector); 872 } 873 874 static inline bool bio_straddles_zones(struct bio *bio) 875 { 876 return bio_sectors(bio) && 877 bio_zone_no(bio) != 878 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1); 879 } 880 881 /* 882 * Return how much of the chunk is left to be used for I/O at a given offset. 883 */ 884 static inline unsigned int blk_chunk_sectors_left(sector_t offset, 885 unsigned int chunk_sectors) 886 { 887 if (unlikely(!is_power_of_2(chunk_sectors))) 888 return chunk_sectors - sector_div(offset, chunk_sectors); 889 return chunk_sectors - (offset & (chunk_sectors - 1)); 890 } 891 892 /** 893 * queue_limits_start_update - start an atomic update of queue limits 894 * @q: queue to update 895 * 896 * This functions starts an atomic update of the queue limits. It takes a lock 897 * to prevent other updates and returns a snapshot of the current limits that 898 * the caller can modify. The caller must call queue_limits_commit_update() 899 * to finish the update. 900 * 901 * Context: process context. The caller must have frozen the queue or ensured 902 * that there is outstanding I/O by other means. 903 */ 904 static inline struct queue_limits 905 queue_limits_start_update(struct request_queue *q) 906 __acquires(q->limits_lock) 907 { 908 mutex_lock(&q->limits_lock); 909 return q->limits; 910 } 911 int queue_limits_commit_update(struct request_queue *q, 912 struct queue_limits *lim); 913 int queue_limits_set(struct request_queue *q, struct queue_limits *lim); 914 915 /** 916 * queue_limits_cancel_update - cancel an atomic update of queue limits 917 * @q: queue to update 918 * 919 * This functions cancels an atomic update of the queue limits started by 920 * queue_limits_start_update() and should be used when an error occurs after 921 * starting update. 922 */ 923 static inline void queue_limits_cancel_update(struct request_queue *q) 924 { 925 mutex_unlock(&q->limits_lock); 926 } 927 928 /* 929 * Access functions for manipulating queue properties 930 */ 931 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 932 void blk_queue_max_secure_erase_sectors(struct request_queue *q, 933 unsigned int max_sectors); 934 extern void blk_queue_max_discard_sectors(struct request_queue *q, 935 unsigned int max_discard_sectors); 936 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 937 unsigned int max_write_same_sectors); 938 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 939 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 940 unsigned int max_zone_append_sectors); 941 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 942 void blk_queue_zone_write_granularity(struct request_queue *q, 943 unsigned int size); 944 extern void blk_queue_alignment_offset(struct request_queue *q, 945 unsigned int alignment); 946 void disk_update_readahead(struct gendisk *disk); 947 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 948 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 949 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 950 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 951 extern void blk_set_stacking_limits(struct queue_limits *lim); 952 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 953 sector_t offset); 954 void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, 955 sector_t offset, const char *pfx); 956 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 957 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 958 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 959 960 struct blk_independent_access_ranges * 961 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); 962 void disk_set_independent_access_ranges(struct gendisk *disk, 963 struct blk_independent_access_ranges *iars); 964 965 bool __must_check blk_get_queue(struct request_queue *); 966 extern void blk_put_queue(struct request_queue *); 967 968 void blk_mark_disk_dead(struct gendisk *disk); 969 970 #ifdef CONFIG_BLOCK 971 /* 972 * blk_plug permits building a queue of related requests by holding the I/O 973 * fragments for a short period. This allows merging of sequential requests 974 * into single larger request. As the requests are moved from a per-task list to 975 * the device's request_queue in a batch, this results in improved scalability 976 * as the lock contention for request_queue lock is reduced. 977 * 978 * It is ok not to disable preemption when adding the request to the plug list 979 * or when attempting a merge. For details, please see schedule() where 980 * blk_flush_plug() is called. 981 */ 982 struct blk_plug { 983 struct request *mq_list; /* blk-mq requests */ 984 985 /* if ios_left is > 1, we can batch tag/rq allocations */ 986 struct request *cached_rq; 987 u64 cur_ktime; 988 unsigned short nr_ios; 989 990 unsigned short rq_count; 991 992 bool multiple_queues; 993 bool has_elevator; 994 995 struct list_head cb_list; /* md requires an unplug callback */ 996 }; 997 998 struct blk_plug_cb; 999 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1000 struct blk_plug_cb { 1001 struct list_head list; 1002 blk_plug_cb_fn callback; 1003 void *data; 1004 }; 1005 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1006 void *data, int size); 1007 extern void blk_start_plug(struct blk_plug *); 1008 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); 1009 extern void blk_finish_plug(struct blk_plug *); 1010 1011 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule); 1012 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1013 { 1014 if (plug) 1015 __blk_flush_plug(plug, async); 1016 } 1017 1018 /* 1019 * tsk == current here 1020 */ 1021 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1022 { 1023 struct blk_plug *plug = tsk->plug; 1024 1025 if (plug) 1026 plug->cur_ktime = 0; 1027 current->flags &= ~PF_BLOCK_TS; 1028 } 1029 1030 int blkdev_issue_flush(struct block_device *bdev); 1031 long nr_blockdev_pages(void); 1032 #else /* CONFIG_BLOCK */ 1033 struct blk_plug { 1034 }; 1035 1036 static inline void blk_start_plug_nr_ios(struct blk_plug *plug, 1037 unsigned short nr_ios) 1038 { 1039 } 1040 1041 static inline void blk_start_plug(struct blk_plug *plug) 1042 { 1043 } 1044 1045 static inline void blk_finish_plug(struct blk_plug *plug) 1046 { 1047 } 1048 1049 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1050 { 1051 } 1052 1053 static inline void blk_plug_invalidate_ts(struct task_struct *tsk) 1054 { 1055 } 1056 1057 static inline int blkdev_issue_flush(struct block_device *bdev) 1058 { 1059 return 0; 1060 } 1061 1062 static inline long nr_blockdev_pages(void) 1063 { 1064 return 0; 1065 } 1066 #endif /* CONFIG_BLOCK */ 1067 1068 extern void blk_io_schedule(void); 1069 1070 int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1071 sector_t nr_sects, gfp_t gfp_mask); 1072 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1073 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); 1074 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, 1075 sector_t nr_sects, gfp_t gfp); 1076 1077 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1078 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1079 1080 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1081 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1082 unsigned flags); 1083 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1084 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1085 1086 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1087 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1088 { 1089 return blkdev_issue_discard(sb->s_bdev, 1090 block << (sb->s_blocksize_bits - 1091 SECTOR_SHIFT), 1092 nr_blocks << (sb->s_blocksize_bits - 1093 SECTOR_SHIFT), 1094 gfp_mask); 1095 } 1096 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1097 sector_t nr_blocks, gfp_t gfp_mask) 1098 { 1099 return blkdev_issue_zeroout(sb->s_bdev, 1100 block << (sb->s_blocksize_bits - 1101 SECTOR_SHIFT), 1102 nr_blocks << (sb->s_blocksize_bits - 1103 SECTOR_SHIFT), 1104 gfp_mask, 0); 1105 } 1106 1107 static inline bool bdev_is_partition(struct block_device *bdev) 1108 { 1109 return bdev_partno(bdev) != 0; 1110 } 1111 1112 enum blk_default_limits { 1113 BLK_MAX_SEGMENTS = 128, 1114 BLK_SAFE_MAX_SECTORS = 255, 1115 BLK_MAX_SEGMENT_SIZE = 65536, 1116 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1117 }; 1118 1119 /* 1120 * Default upper limit for the software max_sectors limit used for 1121 * regular file system I/O. This can be increased through sysfs. 1122 * 1123 * Not to be confused with the max_hw_sector limit that is entirely 1124 * controlled by the driver, usually based on hardware limits. 1125 */ 1126 #define BLK_DEF_MAX_SECTORS_CAP 2560u 1127 1128 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1129 { 1130 return q->limits.seg_boundary_mask; 1131 } 1132 1133 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1134 { 1135 return q->limits.virt_boundary_mask; 1136 } 1137 1138 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1139 { 1140 return q->limits.max_sectors; 1141 } 1142 1143 static inline unsigned int queue_max_bytes(struct request_queue *q) 1144 { 1145 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9; 1146 } 1147 1148 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1149 { 1150 return q->limits.max_hw_sectors; 1151 } 1152 1153 static inline unsigned short queue_max_segments(const struct request_queue *q) 1154 { 1155 return q->limits.max_segments; 1156 } 1157 1158 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1159 { 1160 return q->limits.max_discard_segments; 1161 } 1162 1163 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1164 { 1165 return q->limits.max_segment_size; 1166 } 1167 1168 static inline unsigned int queue_limits_max_zone_append_sectors(struct queue_limits *l) 1169 { 1170 unsigned int max_sectors = min(l->chunk_sectors, l->max_hw_sectors); 1171 1172 return min_not_zero(l->max_zone_append_sectors, max_sectors); 1173 } 1174 1175 static inline unsigned int queue_max_zone_append_sectors(struct request_queue *q) 1176 { 1177 if (!blk_queue_is_zoned(q)) 1178 return 0; 1179 1180 return queue_limits_max_zone_append_sectors(&q->limits); 1181 } 1182 1183 static inline bool queue_emulates_zone_append(struct request_queue *q) 1184 { 1185 return blk_queue_is_zoned(q) && !q->limits.max_zone_append_sectors; 1186 } 1187 1188 static inline bool bdev_emulates_zone_append(struct block_device *bdev) 1189 { 1190 return queue_emulates_zone_append(bdev_get_queue(bdev)); 1191 } 1192 1193 static inline unsigned int 1194 bdev_max_zone_append_sectors(struct block_device *bdev) 1195 { 1196 return queue_max_zone_append_sectors(bdev_get_queue(bdev)); 1197 } 1198 1199 static inline unsigned int bdev_max_segments(struct block_device *bdev) 1200 { 1201 return queue_max_segments(bdev_get_queue(bdev)); 1202 } 1203 1204 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1205 { 1206 int retval = 512; 1207 1208 if (q && q->limits.logical_block_size) 1209 retval = q->limits.logical_block_size; 1210 1211 return retval; 1212 } 1213 1214 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1215 { 1216 return queue_logical_block_size(bdev_get_queue(bdev)); 1217 } 1218 1219 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1220 { 1221 return q->limits.physical_block_size; 1222 } 1223 1224 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1225 { 1226 return queue_physical_block_size(bdev_get_queue(bdev)); 1227 } 1228 1229 static inline unsigned int queue_io_min(const struct request_queue *q) 1230 { 1231 return q->limits.io_min; 1232 } 1233 1234 static inline int bdev_io_min(struct block_device *bdev) 1235 { 1236 return queue_io_min(bdev_get_queue(bdev)); 1237 } 1238 1239 static inline unsigned int queue_io_opt(const struct request_queue *q) 1240 { 1241 return q->limits.io_opt; 1242 } 1243 1244 static inline int bdev_io_opt(struct block_device *bdev) 1245 { 1246 return queue_io_opt(bdev_get_queue(bdev)); 1247 } 1248 1249 static inline unsigned int 1250 queue_zone_write_granularity(const struct request_queue *q) 1251 { 1252 return q->limits.zone_write_granularity; 1253 } 1254 1255 static inline unsigned int 1256 bdev_zone_write_granularity(struct block_device *bdev) 1257 { 1258 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1259 } 1260 1261 int bdev_alignment_offset(struct block_device *bdev); 1262 unsigned int bdev_discard_alignment(struct block_device *bdev); 1263 1264 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev) 1265 { 1266 return bdev_get_queue(bdev)->limits.max_discard_sectors; 1267 } 1268 1269 static inline unsigned int bdev_discard_granularity(struct block_device *bdev) 1270 { 1271 return bdev_get_queue(bdev)->limits.discard_granularity; 1272 } 1273 1274 static inline unsigned int 1275 bdev_max_secure_erase_sectors(struct block_device *bdev) 1276 { 1277 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors; 1278 } 1279 1280 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1281 { 1282 struct request_queue *q = bdev_get_queue(bdev); 1283 1284 if (q) 1285 return q->limits.max_write_zeroes_sectors; 1286 1287 return 0; 1288 } 1289 1290 static inline bool bdev_nonrot(struct block_device *bdev) 1291 { 1292 return blk_queue_nonrot(bdev_get_queue(bdev)); 1293 } 1294 1295 static inline bool bdev_synchronous(struct block_device *bdev) 1296 { 1297 return test_bit(QUEUE_FLAG_SYNCHRONOUS, 1298 &bdev_get_queue(bdev)->queue_flags); 1299 } 1300 1301 static inline bool bdev_stable_writes(struct block_device *bdev) 1302 { 1303 return test_bit(QUEUE_FLAG_STABLE_WRITES, 1304 &bdev_get_queue(bdev)->queue_flags); 1305 } 1306 1307 static inline bool bdev_write_cache(struct block_device *bdev) 1308 { 1309 return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags); 1310 } 1311 1312 static inline bool bdev_fua(struct block_device *bdev) 1313 { 1314 return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags); 1315 } 1316 1317 static inline bool bdev_nowait(struct block_device *bdev) 1318 { 1319 return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags); 1320 } 1321 1322 static inline bool bdev_is_zoned(struct block_device *bdev) 1323 { 1324 return blk_queue_is_zoned(bdev_get_queue(bdev)); 1325 } 1326 1327 static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec) 1328 { 1329 return disk_zone_no(bdev->bd_disk, sec); 1330 } 1331 1332 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1333 { 1334 struct request_queue *q = bdev_get_queue(bdev); 1335 1336 if (!blk_queue_is_zoned(q)) 1337 return 0; 1338 return q->limits.chunk_sectors; 1339 } 1340 1341 static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev, 1342 sector_t sector) 1343 { 1344 return sector & (bdev_zone_sectors(bdev) - 1); 1345 } 1346 1347 static inline sector_t bio_offset_from_zone_start(struct bio *bio) 1348 { 1349 return bdev_offset_from_zone_start(bio->bi_bdev, 1350 bio->bi_iter.bi_sector); 1351 } 1352 1353 static inline bool bdev_is_zone_start(struct block_device *bdev, 1354 sector_t sector) 1355 { 1356 return bdev_offset_from_zone_start(bdev, sector) == 0; 1357 } 1358 1359 static inline int queue_dma_alignment(const struct request_queue *q) 1360 { 1361 return q ? q->limits.dma_alignment : 511; 1362 } 1363 1364 static inline unsigned int bdev_dma_alignment(struct block_device *bdev) 1365 { 1366 return queue_dma_alignment(bdev_get_queue(bdev)); 1367 } 1368 1369 static inline bool bdev_iter_is_aligned(struct block_device *bdev, 1370 struct iov_iter *iter) 1371 { 1372 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev), 1373 bdev_logical_block_size(bdev) - 1); 1374 } 1375 1376 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1377 unsigned int len) 1378 { 1379 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1380 return !(addr & alignment) && !(len & alignment); 1381 } 1382 1383 /* assumes size > 256 */ 1384 static inline unsigned int blksize_bits(unsigned int size) 1385 { 1386 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT; 1387 } 1388 1389 int kblockd_schedule_work(struct work_struct *work); 1390 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1391 1392 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1393 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1394 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1395 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1396 1397 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1398 1399 bool blk_crypto_register(struct blk_crypto_profile *profile, 1400 struct request_queue *q); 1401 1402 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1403 1404 static inline bool blk_crypto_register(struct blk_crypto_profile *profile, 1405 struct request_queue *q) 1406 { 1407 return true; 1408 } 1409 1410 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1411 1412 enum blk_unique_id { 1413 /* these match the Designator Types specified in SPC */ 1414 BLK_UID_T10 = 1, 1415 BLK_UID_EUI64 = 2, 1416 BLK_UID_NAA = 3, 1417 }; 1418 1419 struct block_device_operations { 1420 void (*submit_bio)(struct bio *bio); 1421 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob, 1422 unsigned int flags); 1423 int (*open)(struct gendisk *disk, blk_mode_t mode); 1424 void (*release)(struct gendisk *disk); 1425 int (*ioctl)(struct block_device *bdev, blk_mode_t mode, 1426 unsigned cmd, unsigned long arg); 1427 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode, 1428 unsigned cmd, unsigned long arg); 1429 unsigned int (*check_events) (struct gendisk *disk, 1430 unsigned int clearing); 1431 void (*unlock_native_capacity) (struct gendisk *); 1432 int (*getgeo)(struct block_device *, struct hd_geometry *); 1433 int (*set_read_only)(struct block_device *bdev, bool ro); 1434 void (*free_disk)(struct gendisk *disk); 1435 /* this callback is with swap_lock and sometimes page table lock held */ 1436 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1437 int (*report_zones)(struct gendisk *, sector_t sector, 1438 unsigned int nr_zones, report_zones_cb cb, void *data); 1439 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1440 /* returns the length of the identifier or a negative errno: */ 1441 int (*get_unique_id)(struct gendisk *disk, u8 id[16], 1442 enum blk_unique_id id_type); 1443 struct module *owner; 1444 const struct pr_ops *pr_ops; 1445 1446 /* 1447 * Special callback for probing GPT entry at a given sector. 1448 * Needed by Android devices, used by GPT scanner and MMC blk 1449 * driver. 1450 */ 1451 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector); 1452 }; 1453 1454 #ifdef CONFIG_COMPAT 1455 extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t, 1456 unsigned int, unsigned long); 1457 #else 1458 #define blkdev_compat_ptr_ioctl NULL 1459 #endif 1460 1461 static inline void blk_wake_io_task(struct task_struct *waiter) 1462 { 1463 /* 1464 * If we're polling, the task itself is doing the completions. For 1465 * that case, we don't need to signal a wakeup, it's enough to just 1466 * mark us as RUNNING. 1467 */ 1468 if (waiter == current) 1469 __set_current_state(TASK_RUNNING); 1470 else 1471 wake_up_process(waiter); 1472 } 1473 1474 unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op, 1475 unsigned long start_time); 1476 void bdev_end_io_acct(struct block_device *bdev, enum req_op op, 1477 unsigned int sectors, unsigned long start_time); 1478 1479 unsigned long bio_start_io_acct(struct bio *bio); 1480 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1481 struct block_device *orig_bdev); 1482 1483 /** 1484 * bio_end_io_acct - end I/O accounting for bio based drivers 1485 * @bio: bio to end account for 1486 * @start_time: start time returned by bio_start_io_acct() 1487 */ 1488 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1489 { 1490 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1491 } 1492 1493 int bdev_read_only(struct block_device *bdev); 1494 int set_blocksize(struct file *file, int size); 1495 1496 int lookup_bdev(const char *pathname, dev_t *dev); 1497 1498 void blkdev_show(struct seq_file *seqf, off_t offset); 1499 1500 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1501 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1502 #ifdef CONFIG_BLOCK 1503 #define BLKDEV_MAJOR_MAX 512 1504 #else 1505 #define BLKDEV_MAJOR_MAX 0 1506 #endif 1507 1508 struct blk_holder_ops { 1509 void (*mark_dead)(struct block_device *bdev, bool surprise); 1510 1511 /* 1512 * Sync the file system mounted on the block device. 1513 */ 1514 void (*sync)(struct block_device *bdev); 1515 1516 /* 1517 * Freeze the file system mounted on the block device. 1518 */ 1519 int (*freeze)(struct block_device *bdev); 1520 1521 /* 1522 * Thaw the file system mounted on the block device. 1523 */ 1524 int (*thaw)(struct block_device *bdev); 1525 }; 1526 1527 /* 1528 * For filesystems using @fs_holder_ops, the @holder argument passed to 1529 * helpers used to open and claim block devices via 1530 * bd_prepare_to_claim() must point to a superblock. 1531 */ 1532 extern const struct blk_holder_ops fs_holder_ops; 1533 1534 /* 1535 * Return the correct open flags for blkdev_get_by_* for super block flags 1536 * as stored in sb->s_flags. 1537 */ 1538 #define sb_open_mode(flags) \ 1539 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \ 1540 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE)) 1541 1542 struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, 1543 const struct blk_holder_ops *hops); 1544 struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode, 1545 void *holder, const struct blk_holder_ops *hops); 1546 int bd_prepare_to_claim(struct block_device *bdev, void *holder, 1547 const struct blk_holder_ops *hops); 1548 void bd_abort_claiming(struct block_device *bdev, void *holder); 1549 1550 /* just for blk-cgroup, don't use elsewhere */ 1551 struct block_device *blkdev_get_no_open(dev_t dev); 1552 void blkdev_put_no_open(struct block_device *bdev); 1553 1554 struct block_device *I_BDEV(struct inode *inode); 1555 struct block_device *file_bdev(struct file *bdev_file); 1556 bool disk_live(struct gendisk *disk); 1557 unsigned int block_size(struct block_device *bdev); 1558 1559 #ifdef CONFIG_BLOCK 1560 void invalidate_bdev(struct block_device *bdev); 1561 int sync_blockdev(struct block_device *bdev); 1562 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); 1563 int sync_blockdev_nowait(struct block_device *bdev); 1564 void sync_bdevs(bool wait); 1565 void bdev_statx_dioalign(struct inode *inode, struct kstat *stat); 1566 void printk_all_partitions(void); 1567 int __init early_lookup_bdev(const char *pathname, dev_t *dev); 1568 #else 1569 static inline void invalidate_bdev(struct block_device *bdev) 1570 { 1571 } 1572 static inline int sync_blockdev(struct block_device *bdev) 1573 { 1574 return 0; 1575 } 1576 static inline int sync_blockdev_nowait(struct block_device *bdev) 1577 { 1578 return 0; 1579 } 1580 static inline void sync_bdevs(bool wait) 1581 { 1582 } 1583 static inline void bdev_statx_dioalign(struct inode *inode, struct kstat *stat) 1584 { 1585 } 1586 static inline void printk_all_partitions(void) 1587 { 1588 } 1589 static inline int early_lookup_bdev(const char *pathname, dev_t *dev) 1590 { 1591 return -EINVAL; 1592 } 1593 #endif /* CONFIG_BLOCK */ 1594 1595 int bdev_freeze(struct block_device *bdev); 1596 int bdev_thaw(struct block_device *bdev); 1597 void bdev_fput(struct file *bdev_file); 1598 1599 struct io_comp_batch { 1600 struct request *req_list; 1601 bool need_ts; 1602 void (*complete)(struct io_comp_batch *); 1603 }; 1604 1605 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } 1606 1607 #endif /* _LINUX_BLKDEV_H */ 1608