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