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/srcu.h> 26 #include <linux/uuid.h> 27 #include <linux/xarray.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 struct device_type part_type; 46 extern struct class block_class; 47 48 /* Must be consistent with blk_mq_poll_stats_bkt() */ 49 #define BLK_MQ_POLL_STATS_BKTS 16 50 51 /* Doing classic polling */ 52 #define BLK_MQ_POLL_CLASSIC -1 53 54 /* 55 * Maximum number of blkcg policies allowed to be registered concurrently. 56 * Defined here to simplify include dependency. 57 */ 58 #define BLKCG_MAX_POLS 6 59 60 #define DISK_MAX_PARTS 256 61 #define DISK_NAME_LEN 32 62 63 #define PARTITION_META_INFO_VOLNAMELTH 64 64 /* 65 * Enough for the string representation of any kind of UUID plus NULL. 66 * EFI UUID is 36 characters. MSDOS UUID is 11 characters. 67 */ 68 #define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1) 69 70 struct partition_meta_info { 71 char uuid[PARTITION_META_INFO_UUIDLTH]; 72 u8 volname[PARTITION_META_INFO_VOLNAMELTH]; 73 }; 74 75 /** 76 * DOC: genhd capability flags 77 * 78 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to 79 * removable media. When set, the device remains present even when media is not 80 * inserted. Shall not be set for devices which are removed entirely when the 81 * media is removed. 82 * 83 * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events, 84 * doesn't appear in sysfs, and can't be opened from userspace or using 85 * blkdev_get*. Used for the underlying components of multipath devices. 86 * 87 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not 88 * scan for partitions from add_disk, and users can't add partitions manually. 89 * 90 */ 91 enum { 92 GENHD_FL_REMOVABLE = 1 << 0, 93 GENHD_FL_HIDDEN = 1 << 1, 94 GENHD_FL_NO_PART = 1 << 2, 95 }; 96 97 enum { 98 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ 99 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ 100 }; 101 102 enum { 103 /* Poll even if events_poll_msecs is unset */ 104 DISK_EVENT_FLAG_POLL = 1 << 0, 105 /* Forward events to udev */ 106 DISK_EVENT_FLAG_UEVENT = 1 << 1, 107 /* Block event polling when open for exclusive write */ 108 DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2, 109 }; 110 111 struct disk_events; 112 struct badblocks; 113 114 struct blk_integrity { 115 const struct blk_integrity_profile *profile; 116 unsigned char flags; 117 unsigned char tuple_size; 118 unsigned char interval_exp; 119 unsigned char tag_size; 120 }; 121 122 struct gendisk { 123 /* 124 * major/first_minor/minors should not be set by any new driver, the 125 * block core will take care of allocating them automatically. 126 */ 127 int major; 128 int first_minor; 129 int minors; 130 131 char disk_name[DISK_NAME_LEN]; /* name of major driver */ 132 133 unsigned short events; /* supported events */ 134 unsigned short event_flags; /* flags related to event processing */ 135 136 struct xarray part_tbl; 137 struct block_device *part0; 138 139 const struct block_device_operations *fops; 140 struct request_queue *queue; 141 void *private_data; 142 143 int flags; 144 unsigned long state; 145 #define GD_NEED_PART_SCAN 0 146 #define GD_READ_ONLY 1 147 #define GD_DEAD 2 148 #define GD_NATIVE_CAPACITY 3 149 #define GD_ADDED 4 150 #define GD_SUPPRESS_PART_SCAN 5 151 152 struct mutex open_mutex; /* open/close mutex */ 153 unsigned open_partitions; /* number of open partitions */ 154 155 struct backing_dev_info *bdi; 156 struct kobject *slave_dir; 157 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 158 struct list_head slave_bdevs; 159 #endif 160 struct timer_rand_state *random; 161 atomic_t sync_io; /* RAID */ 162 struct disk_events *ev; 163 #ifdef CONFIG_BLK_DEV_INTEGRITY 164 struct kobject integrity_kobj; 165 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 166 #if IS_ENABLED(CONFIG_CDROM) 167 struct cdrom_device_info *cdi; 168 #endif 169 int node_id; 170 struct badblocks *bb; 171 struct lockdep_map lockdep_map; 172 u64 diskseq; 173 }; 174 175 static inline bool disk_live(struct gendisk *disk) 176 { 177 return !inode_unhashed(disk->part0->bd_inode); 178 } 179 180 /** 181 * disk_openers - returns how many openers are there for a disk 182 * @disk: disk to check 183 * 184 * This returns the number of openers for a disk. Note that this value is only 185 * stable if disk->open_mutex is held. 186 * 187 * Note: Due to a quirk in the block layer open code, each open partition is 188 * only counted once even if there are multiple openers. 189 */ 190 static inline unsigned int disk_openers(struct gendisk *disk) 191 { 192 return atomic_read(&disk->part0->bd_openers); 193 } 194 195 /* 196 * The gendisk is refcounted by the part0 block_device, and the bd_device 197 * therein is also used for device model presentation in sysfs. 198 */ 199 #define dev_to_disk(device) \ 200 (dev_to_bdev(device)->bd_disk) 201 #define disk_to_dev(disk) \ 202 (&((disk)->part0->bd_device)) 203 204 #if IS_REACHABLE(CONFIG_CDROM) 205 #define disk_to_cdi(disk) ((disk)->cdi) 206 #else 207 #define disk_to_cdi(disk) NULL 208 #endif 209 210 static inline dev_t disk_devt(struct gendisk *disk) 211 { 212 return MKDEV(disk->major, disk->first_minor); 213 } 214 215 static inline int blk_validate_block_size(unsigned long bsize) 216 { 217 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize)) 218 return -EINVAL; 219 220 return 0; 221 } 222 223 static inline bool blk_op_is_passthrough(unsigned int op) 224 { 225 op &= REQ_OP_MASK; 226 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT; 227 } 228 229 /* 230 * Zoned block device models (zoned limit). 231 * 232 * Note: This needs to be ordered from the least to the most severe 233 * restrictions for the inheritance in blk_stack_limits() to work. 234 */ 235 enum blk_zoned_model { 236 BLK_ZONED_NONE = 0, /* Regular block device */ 237 BLK_ZONED_HA, /* Host-aware zoned block device */ 238 BLK_ZONED_HM, /* Host-managed zoned block device */ 239 }; 240 241 /* 242 * BLK_BOUNCE_NONE: never bounce (default) 243 * BLK_BOUNCE_HIGH: bounce all highmem pages 244 */ 245 enum blk_bounce { 246 BLK_BOUNCE_NONE, 247 BLK_BOUNCE_HIGH, 248 }; 249 250 struct queue_limits { 251 enum blk_bounce bounce; 252 unsigned long seg_boundary_mask; 253 unsigned long virt_boundary_mask; 254 255 unsigned int max_hw_sectors; 256 unsigned int max_dev_sectors; 257 unsigned int chunk_sectors; 258 unsigned int max_sectors; 259 unsigned int max_segment_size; 260 unsigned int physical_block_size; 261 unsigned int logical_block_size; 262 unsigned int alignment_offset; 263 unsigned int io_min; 264 unsigned int io_opt; 265 unsigned int max_discard_sectors; 266 unsigned int max_hw_discard_sectors; 267 unsigned int max_secure_erase_sectors; 268 unsigned int max_write_zeroes_sectors; 269 unsigned int max_zone_append_sectors; 270 unsigned int discard_granularity; 271 unsigned int discard_alignment; 272 unsigned int zone_write_granularity; 273 274 unsigned short max_segments; 275 unsigned short max_integrity_segments; 276 unsigned short max_discard_segments; 277 278 unsigned char misaligned; 279 unsigned char discard_misaligned; 280 unsigned char raid_partial_stripes_expensive; 281 enum blk_zoned_model zoned; 282 }; 283 284 typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx, 285 void *data); 286 287 void blk_queue_set_zoned(struct gendisk *disk, enum blk_zoned_model model); 288 289 #ifdef CONFIG_BLK_DEV_ZONED 290 291 #define BLK_ALL_ZONES ((unsigned int)-1) 292 int blkdev_report_zones(struct block_device *bdev, sector_t sector, 293 unsigned int nr_zones, report_zones_cb cb, void *data); 294 unsigned int blkdev_nr_zones(struct gendisk *disk); 295 extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op, 296 sector_t sectors, sector_t nr_sectors, 297 gfp_t gfp_mask); 298 int blk_revalidate_disk_zones(struct gendisk *disk, 299 void (*update_driver_data)(struct gendisk *disk)); 300 301 extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode, 302 unsigned int cmd, unsigned long arg); 303 extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode, 304 unsigned int cmd, unsigned long arg); 305 306 #else /* CONFIG_BLK_DEV_ZONED */ 307 308 static inline unsigned int blkdev_nr_zones(struct gendisk *disk) 309 { 310 return 0; 311 } 312 313 static inline int blkdev_report_zones_ioctl(struct block_device *bdev, 314 fmode_t mode, unsigned int cmd, 315 unsigned long arg) 316 { 317 return -ENOTTY; 318 } 319 320 static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev, 321 fmode_t mode, unsigned int cmd, 322 unsigned long arg) 323 { 324 return -ENOTTY; 325 } 326 327 #endif /* CONFIG_BLK_DEV_ZONED */ 328 329 /* 330 * Independent access ranges: struct blk_independent_access_range describes 331 * a range of contiguous sectors that can be accessed using device command 332 * execution resources that are independent from the resources used for 333 * other access ranges. This is typically found with single-LUN multi-actuator 334 * HDDs where each access range is served by a different set of heads. 335 * The set of independent ranges supported by the device is defined using 336 * struct blk_independent_access_ranges. The independent ranges must not overlap 337 * and must include all sectors within the disk capacity (no sector holes 338 * allowed). 339 * For a device with multiple ranges, requests targeting sectors in different 340 * ranges can be executed in parallel. A request can straddle an access range 341 * boundary. 342 */ 343 struct blk_independent_access_range { 344 struct kobject kobj; 345 struct request_queue *queue; 346 sector_t sector; 347 sector_t nr_sectors; 348 }; 349 350 struct blk_independent_access_ranges { 351 struct kobject kobj; 352 bool sysfs_registered; 353 unsigned int nr_ia_ranges; 354 struct blk_independent_access_range ia_range[]; 355 }; 356 357 struct request_queue { 358 struct request *last_merge; 359 struct elevator_queue *elevator; 360 361 struct percpu_ref q_usage_counter; 362 363 struct blk_queue_stats *stats; 364 struct rq_qos *rq_qos; 365 366 const struct blk_mq_ops *mq_ops; 367 368 /* sw queues */ 369 struct blk_mq_ctx __percpu *queue_ctx; 370 371 unsigned int queue_depth; 372 373 /* hw dispatch queues */ 374 struct xarray hctx_table; 375 unsigned int nr_hw_queues; 376 377 /* 378 * The queue owner gets to use this for whatever they like. 379 * ll_rw_blk doesn't touch it. 380 */ 381 void *queuedata; 382 383 /* 384 * various queue flags, see QUEUE_* below 385 */ 386 unsigned long queue_flags; 387 /* 388 * Number of contexts that have called blk_set_pm_only(). If this 389 * counter is above zero then only RQF_PM requests are processed. 390 */ 391 atomic_t pm_only; 392 393 /* 394 * ida allocated id for this queue. Used to index queues from 395 * ioctx. 396 */ 397 int id; 398 399 spinlock_t queue_lock; 400 401 struct gendisk *disk; 402 403 /* 404 * queue kobject 405 */ 406 struct kobject kobj; 407 408 /* 409 * mq queue kobject 410 */ 411 struct kobject *mq_kobj; 412 413 #ifdef CONFIG_BLK_DEV_INTEGRITY 414 struct blk_integrity integrity; 415 #endif /* CONFIG_BLK_DEV_INTEGRITY */ 416 417 #ifdef CONFIG_PM 418 struct device *dev; 419 enum rpm_status rpm_status; 420 #endif 421 422 /* 423 * queue settings 424 */ 425 unsigned long nr_requests; /* Max # of requests */ 426 427 unsigned int dma_pad_mask; 428 unsigned int dma_alignment; 429 430 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 431 struct blk_crypto_profile *crypto_profile; 432 struct kobject *crypto_kobject; 433 #endif 434 435 unsigned int rq_timeout; 436 int poll_nsec; 437 438 struct blk_stat_callback *poll_cb; 439 struct blk_rq_stat *poll_stat; 440 441 struct timer_list timeout; 442 struct work_struct timeout_work; 443 444 atomic_t nr_active_requests_shared_tags; 445 446 struct blk_mq_tags *sched_shared_tags; 447 448 struct list_head icq_list; 449 #ifdef CONFIG_BLK_CGROUP 450 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); 451 struct blkcg_gq *root_blkg; 452 struct list_head blkg_list; 453 #endif 454 455 struct queue_limits limits; 456 457 unsigned int required_elevator_features; 458 459 #ifdef CONFIG_BLK_DEV_ZONED 460 /* 461 * Zoned block device information for request dispatch control. 462 * nr_zones is the total number of zones of the device. This is always 463 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones 464 * bits which indicates if a zone is conventional (bit set) or 465 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones 466 * bits which indicates if a zone is write locked, that is, if a write 467 * request targeting the zone was dispatched. All three fields are 468 * initialized by the low level device driver (e.g. scsi/sd.c). 469 * Stacking drivers (device mappers) may or may not initialize 470 * these fields. 471 * 472 * Reads of this information must be protected with blk_queue_enter() / 473 * blk_queue_exit(). Modifying this information is only allowed while 474 * no requests are being processed. See also blk_mq_freeze_queue() and 475 * blk_mq_unfreeze_queue(). 476 */ 477 unsigned int nr_zones; 478 unsigned long *conv_zones_bitmap; 479 unsigned long *seq_zones_wlock; 480 unsigned int max_open_zones; 481 unsigned int max_active_zones; 482 #endif /* CONFIG_BLK_DEV_ZONED */ 483 484 int node; 485 struct mutex debugfs_mutex; 486 #ifdef CONFIG_BLK_DEV_IO_TRACE 487 struct blk_trace __rcu *blk_trace; 488 #endif 489 /* 490 * for flush operations 491 */ 492 struct blk_flush_queue *fq; 493 494 struct list_head requeue_list; 495 spinlock_t requeue_lock; 496 struct delayed_work requeue_work; 497 498 struct mutex sysfs_lock; 499 struct mutex sysfs_dir_lock; 500 501 /* 502 * for reusing dead hctx instance in case of updating 503 * nr_hw_queues 504 */ 505 struct list_head unused_hctx_list; 506 spinlock_t unused_hctx_lock; 507 508 int mq_freeze_depth; 509 510 #ifdef CONFIG_BLK_DEV_THROTTLING 511 /* Throttle data */ 512 struct throtl_data *td; 513 #endif 514 struct rcu_head rcu_head; 515 wait_queue_head_t mq_freeze_wq; 516 /* 517 * Protect concurrent access to q_usage_counter by 518 * percpu_ref_kill() and percpu_ref_reinit(). 519 */ 520 struct mutex mq_freeze_lock; 521 522 int quiesce_depth; 523 524 struct blk_mq_tag_set *tag_set; 525 struct list_head tag_set_list; 526 struct bio_set bio_split; 527 528 struct dentry *debugfs_dir; 529 530 #ifdef CONFIG_BLK_DEBUG_FS 531 struct dentry *sched_debugfs_dir; 532 struct dentry *rqos_debugfs_dir; 533 #endif 534 535 bool mq_sysfs_init_done; 536 537 /* 538 * Independent sector access ranges. This is always NULL for 539 * devices that do not have multiple independent access ranges. 540 */ 541 struct blk_independent_access_ranges *ia_ranges; 542 543 /** 544 * @srcu: Sleepable RCU. Use as lock when type of the request queue 545 * is blocking (BLK_MQ_F_BLOCKING). Must be the last member 546 */ 547 struct srcu_struct srcu[]; 548 }; 549 550 /* Keep blk_queue_flag_name[] in sync with the definitions below */ 551 #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */ 552 #define QUEUE_FLAG_DYING 1 /* queue being torn down */ 553 #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */ 554 #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */ 555 #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */ 556 #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */ 557 #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */ 558 #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ 559 #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */ 560 #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */ 561 #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */ 562 #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */ 563 #define QUEUE_FLAG_DEAD 13 /* queue tear-down finished */ 564 #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */ 565 #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */ 566 #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */ 567 #define QUEUE_FLAG_WC 17 /* Write back caching */ 568 #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */ 569 #define QUEUE_FLAG_DAX 19 /* device supports DAX */ 570 #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */ 571 #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */ 572 #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ 573 #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ 574 #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */ 575 #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */ 576 #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */ 577 #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */ 578 579 #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ 580 (1 << QUEUE_FLAG_SAME_COMP) | \ 581 (1 << QUEUE_FLAG_NOWAIT)) 582 583 void blk_queue_flag_set(unsigned int flag, struct request_queue *q); 584 void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); 585 bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); 586 587 #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) 588 #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags) 589 #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags) 590 #define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags) 591 #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags) 592 #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags) 593 #define blk_queue_noxmerges(q) \ 594 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags) 595 #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) 596 #define blk_queue_stable_writes(q) \ 597 test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags) 598 #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) 599 #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) 600 #define blk_queue_zone_resetall(q) \ 601 test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags) 602 #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) 603 #define blk_queue_pci_p2pdma(q) \ 604 test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) 605 #ifdef CONFIG_BLK_RQ_ALLOC_TIME 606 #define blk_queue_rq_alloc_time(q) \ 607 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags) 608 #else 609 #define blk_queue_rq_alloc_time(q) false 610 #endif 611 612 #define blk_noretry_request(rq) \ 613 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ 614 REQ_FAILFAST_DRIVER)) 615 #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) 616 #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only) 617 #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags) 618 #define blk_queue_nowait(q) test_bit(QUEUE_FLAG_NOWAIT, &(q)->queue_flags) 619 620 extern void blk_set_pm_only(struct request_queue *q); 621 extern void blk_clear_pm_only(struct request_queue *q); 622 623 #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) 624 625 #define dma_map_bvec(dev, bv, dir, attrs) \ 626 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \ 627 (dir), (attrs)) 628 629 static inline bool queue_is_mq(struct request_queue *q) 630 { 631 return q->mq_ops; 632 } 633 634 #ifdef CONFIG_PM 635 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 636 { 637 return q->rpm_status; 638 } 639 #else 640 static inline enum rpm_status queue_rpm_status(struct request_queue *q) 641 { 642 return RPM_ACTIVE; 643 } 644 #endif 645 646 static inline enum blk_zoned_model 647 blk_queue_zoned_model(struct request_queue *q) 648 { 649 if (IS_ENABLED(CONFIG_BLK_DEV_ZONED)) 650 return q->limits.zoned; 651 return BLK_ZONED_NONE; 652 } 653 654 static inline bool blk_queue_is_zoned(struct request_queue *q) 655 { 656 switch (blk_queue_zoned_model(q)) { 657 case BLK_ZONED_HA: 658 case BLK_ZONED_HM: 659 return true; 660 default: 661 return false; 662 } 663 } 664 665 static inline sector_t blk_queue_zone_sectors(struct request_queue *q) 666 { 667 return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0; 668 } 669 670 #ifdef CONFIG_BLK_DEV_ZONED 671 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 672 { 673 return blk_queue_is_zoned(q) ? q->nr_zones : 0; 674 } 675 676 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 677 sector_t sector) 678 { 679 if (!blk_queue_is_zoned(q)) 680 return 0; 681 return sector >> ilog2(q->limits.chunk_sectors); 682 } 683 684 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 685 sector_t sector) 686 { 687 if (!blk_queue_is_zoned(q)) 688 return false; 689 if (!q->conv_zones_bitmap) 690 return true; 691 return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap); 692 } 693 694 static inline void blk_queue_max_open_zones(struct request_queue *q, 695 unsigned int max_open_zones) 696 { 697 q->max_open_zones = max_open_zones; 698 } 699 700 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 701 { 702 return q->max_open_zones; 703 } 704 705 static inline void blk_queue_max_active_zones(struct request_queue *q, 706 unsigned int max_active_zones) 707 { 708 q->max_active_zones = max_active_zones; 709 } 710 711 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 712 { 713 return q->max_active_zones; 714 } 715 #else /* CONFIG_BLK_DEV_ZONED */ 716 static inline unsigned int blk_queue_nr_zones(struct request_queue *q) 717 { 718 return 0; 719 } 720 static inline bool blk_queue_zone_is_seq(struct request_queue *q, 721 sector_t sector) 722 { 723 return false; 724 } 725 static inline unsigned int blk_queue_zone_no(struct request_queue *q, 726 sector_t sector) 727 { 728 return 0; 729 } 730 static inline unsigned int queue_max_open_zones(const struct request_queue *q) 731 { 732 return 0; 733 } 734 static inline unsigned int queue_max_active_zones(const struct request_queue *q) 735 { 736 return 0; 737 } 738 #endif /* CONFIG_BLK_DEV_ZONED */ 739 740 static inline unsigned int blk_queue_depth(struct request_queue *q) 741 { 742 if (q->queue_depth) 743 return q->queue_depth; 744 745 return q->nr_requests; 746 } 747 748 /* 749 * default timeout for SG_IO if none specified 750 */ 751 #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ) 752 #define BLK_MIN_SG_TIMEOUT (7 * HZ) 753 754 /* This should not be used directly - use rq_for_each_segment */ 755 #define for_each_bio(_bio) \ 756 for (; _bio; _bio = _bio->bi_next) 757 758 int __must_check device_add_disk(struct device *parent, struct gendisk *disk, 759 const struct attribute_group **groups); 760 static inline int __must_check add_disk(struct gendisk *disk) 761 { 762 return device_add_disk(NULL, disk, NULL); 763 } 764 void del_gendisk(struct gendisk *gp); 765 void invalidate_disk(struct gendisk *disk); 766 void set_disk_ro(struct gendisk *disk, bool read_only); 767 void disk_uevent(struct gendisk *disk, enum kobject_action action); 768 769 static inline int get_disk_ro(struct gendisk *disk) 770 { 771 return disk->part0->bd_read_only || 772 test_bit(GD_READ_ONLY, &disk->state); 773 } 774 775 static inline int bdev_read_only(struct block_device *bdev) 776 { 777 return bdev->bd_read_only || get_disk_ro(bdev->bd_disk); 778 } 779 780 bool set_capacity_and_notify(struct gendisk *disk, sector_t size); 781 bool disk_force_media_change(struct gendisk *disk, unsigned int events); 782 783 void add_disk_randomness(struct gendisk *disk) __latent_entropy; 784 void rand_initialize_disk(struct gendisk *disk); 785 786 static inline sector_t get_start_sect(struct block_device *bdev) 787 { 788 return bdev->bd_start_sect; 789 } 790 791 static inline sector_t bdev_nr_sectors(struct block_device *bdev) 792 { 793 return bdev->bd_nr_sectors; 794 } 795 796 static inline loff_t bdev_nr_bytes(struct block_device *bdev) 797 { 798 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT; 799 } 800 801 static inline sector_t get_capacity(struct gendisk *disk) 802 { 803 return bdev_nr_sectors(disk->part0); 804 } 805 806 static inline u64 sb_bdev_nr_blocks(struct super_block *sb) 807 { 808 return bdev_nr_sectors(sb->s_bdev) >> 809 (sb->s_blocksize_bits - SECTOR_SHIFT); 810 } 811 812 int bdev_disk_changed(struct gendisk *disk, bool invalidate); 813 814 struct gendisk *__alloc_disk_node(struct request_queue *q, int node_id, 815 struct lock_class_key *lkclass); 816 void put_disk(struct gendisk *disk); 817 struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass); 818 819 /** 820 * blk_alloc_disk - allocate a gendisk structure 821 * @node_id: numa node to allocate on 822 * 823 * Allocate and pre-initialize a gendisk structure for use with BIO based 824 * drivers. 825 * 826 * Context: can sleep 827 */ 828 #define blk_alloc_disk(node_id) \ 829 ({ \ 830 static struct lock_class_key __key; \ 831 \ 832 __blk_alloc_disk(node_id, &__key); \ 833 }) 834 void blk_cleanup_disk(struct gendisk *disk); 835 836 int __register_blkdev(unsigned int major, const char *name, 837 void (*probe)(dev_t devt)); 838 #define register_blkdev(major, name) \ 839 __register_blkdev(major, name, NULL) 840 void unregister_blkdev(unsigned int major, const char *name); 841 842 bool bdev_check_media_change(struct block_device *bdev); 843 int __invalidate_device(struct block_device *bdev, bool kill_dirty); 844 void set_capacity(struct gendisk *disk, sector_t size); 845 846 #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED 847 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); 848 void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); 849 int bd_register_pending_holders(struct gendisk *disk); 850 #else 851 static inline int bd_link_disk_holder(struct block_device *bdev, 852 struct gendisk *disk) 853 { 854 return 0; 855 } 856 static inline void bd_unlink_disk_holder(struct block_device *bdev, 857 struct gendisk *disk) 858 { 859 } 860 static inline int bd_register_pending_holders(struct gendisk *disk) 861 { 862 return 0; 863 } 864 #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ 865 866 dev_t part_devt(struct gendisk *disk, u8 partno); 867 void inc_diskseq(struct gendisk *disk); 868 dev_t blk_lookup_devt(const char *name, int partno); 869 void blk_request_module(dev_t devt); 870 871 extern int blk_register_queue(struct gendisk *disk); 872 extern void blk_unregister_queue(struct gendisk *disk); 873 void submit_bio_noacct(struct bio *bio); 874 875 extern int blk_lld_busy(struct request_queue *q); 876 extern void blk_queue_split(struct bio **); 877 extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); 878 extern void blk_queue_exit(struct request_queue *q); 879 extern void blk_sync_queue(struct request_queue *q); 880 881 /* Helper to convert REQ_OP_XXX to its string format XXX */ 882 extern const char *blk_op_str(unsigned int op); 883 884 int blk_status_to_errno(blk_status_t status); 885 blk_status_t errno_to_blk_status(int errno); 886 887 /* only poll the hardware once, don't continue until a completion was found */ 888 #define BLK_POLL_ONESHOT (1 << 0) 889 /* do not sleep to wait for the expected completion time */ 890 #define BLK_POLL_NOSLEEP (1 << 1) 891 int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); 892 int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, 893 unsigned int flags); 894 895 static inline struct request_queue *bdev_get_queue(struct block_device *bdev) 896 { 897 return bdev->bd_queue; /* this is never NULL */ 898 } 899 900 #ifdef CONFIG_BLK_DEV_ZONED 901 902 /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ 903 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); 904 905 static inline unsigned int bio_zone_no(struct bio *bio) 906 { 907 return blk_queue_zone_no(bdev_get_queue(bio->bi_bdev), 908 bio->bi_iter.bi_sector); 909 } 910 911 static inline unsigned int bio_zone_is_seq(struct bio *bio) 912 { 913 return blk_queue_zone_is_seq(bdev_get_queue(bio->bi_bdev), 914 bio->bi_iter.bi_sector); 915 } 916 #endif /* CONFIG_BLK_DEV_ZONED */ 917 918 static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q, 919 int op) 920 { 921 if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE)) 922 return min(q->limits.max_discard_sectors, 923 UINT_MAX >> SECTOR_SHIFT); 924 925 if (unlikely(op == REQ_OP_WRITE_ZEROES)) 926 return q->limits.max_write_zeroes_sectors; 927 928 return q->limits.max_sectors; 929 } 930 931 /* 932 * Return maximum size of a request at given offset. Only valid for 933 * file system requests. 934 */ 935 static inline unsigned int blk_max_size_offset(struct request_queue *q, 936 sector_t offset, 937 unsigned int chunk_sectors) 938 { 939 if (!chunk_sectors) { 940 if (q->limits.chunk_sectors) 941 chunk_sectors = q->limits.chunk_sectors; 942 else 943 return q->limits.max_sectors; 944 } 945 946 if (likely(is_power_of_2(chunk_sectors))) 947 chunk_sectors -= offset & (chunk_sectors - 1); 948 else 949 chunk_sectors -= sector_div(offset, chunk_sectors); 950 951 return min(q->limits.max_sectors, chunk_sectors); 952 } 953 954 /* 955 * Access functions for manipulating queue properties 956 */ 957 extern void blk_cleanup_queue(struct request_queue *); 958 void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit); 959 extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int); 960 extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int); 961 extern void blk_queue_max_segments(struct request_queue *, unsigned short); 962 extern void blk_queue_max_discard_segments(struct request_queue *, 963 unsigned short); 964 void blk_queue_max_secure_erase_sectors(struct request_queue *q, 965 unsigned int max_sectors); 966 extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); 967 extern void blk_queue_max_discard_sectors(struct request_queue *q, 968 unsigned int max_discard_sectors); 969 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q, 970 unsigned int max_write_same_sectors); 971 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int); 972 extern void blk_queue_max_zone_append_sectors(struct request_queue *q, 973 unsigned int max_zone_append_sectors); 974 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int); 975 void blk_queue_zone_write_granularity(struct request_queue *q, 976 unsigned int size); 977 extern void blk_queue_alignment_offset(struct request_queue *q, 978 unsigned int alignment); 979 void disk_update_readahead(struct gendisk *disk); 980 extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min); 981 extern void blk_queue_io_min(struct request_queue *q, unsigned int min); 982 extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt); 983 extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt); 984 extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); 985 extern void blk_set_default_limits(struct queue_limits *lim); 986 extern void blk_set_stacking_limits(struct queue_limits *lim); 987 extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, 988 sector_t offset); 989 extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, 990 sector_t offset); 991 extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int); 992 extern void blk_queue_segment_boundary(struct request_queue *, unsigned long); 993 extern void blk_queue_virt_boundary(struct request_queue *, unsigned long); 994 extern void blk_queue_dma_alignment(struct request_queue *, int); 995 extern void blk_queue_update_dma_alignment(struct request_queue *, int); 996 extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); 997 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua); 998 999 struct blk_independent_access_ranges * 1000 disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); 1001 void disk_set_independent_access_ranges(struct gendisk *disk, 1002 struct blk_independent_access_ranges *iars); 1003 1004 /* 1005 * Elevator features for blk_queue_required_elevator_features: 1006 */ 1007 /* Supports zoned block devices sequential write constraint */ 1008 #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0) 1009 /* Supports scheduling on multiple hardware queues */ 1010 #define ELEVATOR_F_MQ_AWARE (1U << 1) 1011 1012 extern void blk_queue_required_elevator_features(struct request_queue *q, 1013 unsigned int features); 1014 extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q, 1015 struct device *dev); 1016 1017 bool __must_check blk_get_queue(struct request_queue *); 1018 extern void blk_put_queue(struct request_queue *); 1019 1020 void blk_mark_disk_dead(struct gendisk *disk); 1021 1022 #ifdef CONFIG_BLOCK 1023 /* 1024 * blk_plug permits building a queue of related requests by holding the I/O 1025 * fragments for a short period. This allows merging of sequential requests 1026 * into single larger request. As the requests are moved from a per-task list to 1027 * the device's request_queue in a batch, this results in improved scalability 1028 * as the lock contention for request_queue lock is reduced. 1029 * 1030 * It is ok not to disable preemption when adding the request to the plug list 1031 * or when attempting a merge. For details, please see schedule() where 1032 * blk_flush_plug() is called. 1033 */ 1034 struct blk_plug { 1035 struct request *mq_list; /* blk-mq requests */ 1036 1037 /* if ios_left is > 1, we can batch tag/rq allocations */ 1038 struct request *cached_rq; 1039 unsigned short nr_ios; 1040 1041 unsigned short rq_count; 1042 1043 bool multiple_queues; 1044 bool has_elevator; 1045 bool nowait; 1046 1047 struct list_head cb_list; /* md requires an unplug callback */ 1048 }; 1049 1050 struct blk_plug_cb; 1051 typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool); 1052 struct blk_plug_cb { 1053 struct list_head list; 1054 blk_plug_cb_fn callback; 1055 void *data; 1056 }; 1057 extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, 1058 void *data, int size); 1059 extern void blk_start_plug(struct blk_plug *); 1060 extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); 1061 extern void blk_finish_plug(struct blk_plug *); 1062 1063 void __blk_flush_plug(struct blk_plug *plug, bool from_schedule); 1064 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1065 { 1066 if (plug) 1067 __blk_flush_plug(plug, async); 1068 } 1069 1070 int blkdev_issue_flush(struct block_device *bdev); 1071 long nr_blockdev_pages(void); 1072 #else /* CONFIG_BLOCK */ 1073 struct blk_plug { 1074 }; 1075 1076 static inline void blk_start_plug_nr_ios(struct blk_plug *plug, 1077 unsigned short nr_ios) 1078 { 1079 } 1080 1081 static inline void blk_start_plug(struct blk_plug *plug) 1082 { 1083 } 1084 1085 static inline void blk_finish_plug(struct blk_plug *plug) 1086 { 1087 } 1088 1089 static inline void blk_flush_plug(struct blk_plug *plug, bool async) 1090 { 1091 } 1092 1093 static inline int blkdev_issue_flush(struct block_device *bdev) 1094 { 1095 return 0; 1096 } 1097 1098 static inline long nr_blockdev_pages(void) 1099 { 1100 return 0; 1101 } 1102 #endif /* CONFIG_BLOCK */ 1103 1104 extern void blk_io_schedule(void); 1105 1106 int blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1107 sector_t nr_sects, gfp_t gfp_mask); 1108 int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, 1109 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); 1110 int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, 1111 sector_t nr_sects, gfp_t gfp); 1112 1113 #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ 1114 #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ 1115 1116 extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1117 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, 1118 unsigned flags); 1119 extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, 1120 sector_t nr_sects, gfp_t gfp_mask, unsigned flags); 1121 1122 static inline int sb_issue_discard(struct super_block *sb, sector_t block, 1123 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) 1124 { 1125 return blkdev_issue_discard(sb->s_bdev, 1126 block << (sb->s_blocksize_bits - 1127 SECTOR_SHIFT), 1128 nr_blocks << (sb->s_blocksize_bits - 1129 SECTOR_SHIFT), 1130 gfp_mask); 1131 } 1132 static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, 1133 sector_t nr_blocks, gfp_t gfp_mask) 1134 { 1135 return blkdev_issue_zeroout(sb->s_bdev, 1136 block << (sb->s_blocksize_bits - 1137 SECTOR_SHIFT), 1138 nr_blocks << (sb->s_blocksize_bits - 1139 SECTOR_SHIFT), 1140 gfp_mask, 0); 1141 } 1142 1143 static inline bool bdev_is_partition(struct block_device *bdev) 1144 { 1145 return bdev->bd_partno; 1146 } 1147 1148 enum blk_default_limits { 1149 BLK_MAX_SEGMENTS = 128, 1150 BLK_SAFE_MAX_SECTORS = 255, 1151 BLK_DEF_MAX_SECTORS = 2560, 1152 BLK_MAX_SEGMENT_SIZE = 65536, 1153 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL, 1154 }; 1155 1156 static inline unsigned long queue_segment_boundary(const struct request_queue *q) 1157 { 1158 return q->limits.seg_boundary_mask; 1159 } 1160 1161 static inline unsigned long queue_virt_boundary(const struct request_queue *q) 1162 { 1163 return q->limits.virt_boundary_mask; 1164 } 1165 1166 static inline unsigned int queue_max_sectors(const struct request_queue *q) 1167 { 1168 return q->limits.max_sectors; 1169 } 1170 1171 static inline unsigned int queue_max_bytes(struct request_queue *q) 1172 { 1173 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9; 1174 } 1175 1176 static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) 1177 { 1178 return q->limits.max_hw_sectors; 1179 } 1180 1181 static inline unsigned short queue_max_segments(const struct request_queue *q) 1182 { 1183 return q->limits.max_segments; 1184 } 1185 1186 static inline unsigned short queue_max_discard_segments(const struct request_queue *q) 1187 { 1188 return q->limits.max_discard_segments; 1189 } 1190 1191 static inline unsigned int queue_max_segment_size(const struct request_queue *q) 1192 { 1193 return q->limits.max_segment_size; 1194 } 1195 1196 static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q) 1197 { 1198 1199 const struct queue_limits *l = &q->limits; 1200 1201 return min(l->max_zone_append_sectors, l->max_sectors); 1202 } 1203 1204 static inline unsigned int 1205 bdev_max_zone_append_sectors(struct block_device *bdev) 1206 { 1207 return queue_max_zone_append_sectors(bdev_get_queue(bdev)); 1208 } 1209 1210 static inline unsigned queue_logical_block_size(const struct request_queue *q) 1211 { 1212 int retval = 512; 1213 1214 if (q && q->limits.logical_block_size) 1215 retval = q->limits.logical_block_size; 1216 1217 return retval; 1218 } 1219 1220 static inline unsigned int bdev_logical_block_size(struct block_device *bdev) 1221 { 1222 return queue_logical_block_size(bdev_get_queue(bdev)); 1223 } 1224 1225 static inline unsigned int queue_physical_block_size(const struct request_queue *q) 1226 { 1227 return q->limits.physical_block_size; 1228 } 1229 1230 static inline unsigned int bdev_physical_block_size(struct block_device *bdev) 1231 { 1232 return queue_physical_block_size(bdev_get_queue(bdev)); 1233 } 1234 1235 static inline unsigned int queue_io_min(const struct request_queue *q) 1236 { 1237 return q->limits.io_min; 1238 } 1239 1240 static inline int bdev_io_min(struct block_device *bdev) 1241 { 1242 return queue_io_min(bdev_get_queue(bdev)); 1243 } 1244 1245 static inline unsigned int queue_io_opt(const struct request_queue *q) 1246 { 1247 return q->limits.io_opt; 1248 } 1249 1250 static inline int bdev_io_opt(struct block_device *bdev) 1251 { 1252 return queue_io_opt(bdev_get_queue(bdev)); 1253 } 1254 1255 static inline unsigned int 1256 queue_zone_write_granularity(const struct request_queue *q) 1257 { 1258 return q->limits.zone_write_granularity; 1259 } 1260 1261 static inline unsigned int 1262 bdev_zone_write_granularity(struct block_device *bdev) 1263 { 1264 return queue_zone_write_granularity(bdev_get_queue(bdev)); 1265 } 1266 1267 int bdev_alignment_offset(struct block_device *bdev); 1268 unsigned int bdev_discard_alignment(struct block_device *bdev); 1269 1270 static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev) 1271 { 1272 return bdev_get_queue(bdev)->limits.max_discard_sectors; 1273 } 1274 1275 static inline unsigned int bdev_discard_granularity(struct block_device *bdev) 1276 { 1277 return bdev_get_queue(bdev)->limits.discard_granularity; 1278 } 1279 1280 static inline unsigned int 1281 bdev_max_secure_erase_sectors(struct block_device *bdev) 1282 { 1283 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors; 1284 } 1285 1286 static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) 1287 { 1288 struct request_queue *q = bdev_get_queue(bdev); 1289 1290 if (q) 1291 return q->limits.max_write_zeroes_sectors; 1292 1293 return 0; 1294 } 1295 1296 static inline bool bdev_nonrot(struct block_device *bdev) 1297 { 1298 return blk_queue_nonrot(bdev_get_queue(bdev)); 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 enum blk_zoned_model bdev_zoned_model(struct block_device *bdev) 1318 { 1319 struct request_queue *q = bdev_get_queue(bdev); 1320 1321 if (q) 1322 return blk_queue_zoned_model(q); 1323 1324 return BLK_ZONED_NONE; 1325 } 1326 1327 static inline bool bdev_is_zoned(struct block_device *bdev) 1328 { 1329 struct request_queue *q = bdev_get_queue(bdev); 1330 1331 if (q) 1332 return blk_queue_is_zoned(q); 1333 1334 return false; 1335 } 1336 1337 static inline sector_t bdev_zone_sectors(struct block_device *bdev) 1338 { 1339 struct request_queue *q = bdev_get_queue(bdev); 1340 1341 if (q) 1342 return blk_queue_zone_sectors(q); 1343 return 0; 1344 } 1345 1346 static inline unsigned int bdev_max_open_zones(struct block_device *bdev) 1347 { 1348 struct request_queue *q = bdev_get_queue(bdev); 1349 1350 if (q) 1351 return queue_max_open_zones(q); 1352 return 0; 1353 } 1354 1355 static inline unsigned int bdev_max_active_zones(struct block_device *bdev) 1356 { 1357 struct request_queue *q = bdev_get_queue(bdev); 1358 1359 if (q) 1360 return queue_max_active_zones(q); 1361 return 0; 1362 } 1363 1364 static inline int queue_dma_alignment(const struct request_queue *q) 1365 { 1366 return q ? q->dma_alignment : 511; 1367 } 1368 1369 static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, 1370 unsigned int len) 1371 { 1372 unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; 1373 return !(addr & alignment) && !(len & alignment); 1374 } 1375 1376 /* assumes size > 256 */ 1377 static inline unsigned int blksize_bits(unsigned int size) 1378 { 1379 unsigned int bits = 8; 1380 do { 1381 bits++; 1382 size >>= 1; 1383 } while (size > 256); 1384 return bits; 1385 } 1386 1387 static inline unsigned int block_size(struct block_device *bdev) 1388 { 1389 return 1 << bdev->bd_inode->i_blkbits; 1390 } 1391 1392 int kblockd_schedule_work(struct work_struct *work); 1393 int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); 1394 1395 #define MODULE_ALIAS_BLOCKDEV(major,minor) \ 1396 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor)) 1397 #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \ 1398 MODULE_ALIAS("block-major-" __stringify(major) "-*") 1399 1400 #ifdef CONFIG_BLK_INLINE_ENCRYPTION 1401 1402 bool blk_crypto_register(struct blk_crypto_profile *profile, 1403 struct request_queue *q); 1404 1405 #else /* CONFIG_BLK_INLINE_ENCRYPTION */ 1406 1407 static inline bool blk_crypto_register(struct blk_crypto_profile *profile, 1408 struct request_queue *q) 1409 { 1410 return true; 1411 } 1412 1413 #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ 1414 1415 enum blk_unique_id { 1416 /* these match the Designator Types specified in SPC */ 1417 BLK_UID_T10 = 1, 1418 BLK_UID_EUI64 = 2, 1419 BLK_UID_NAA = 3, 1420 }; 1421 1422 #define NFL4_UFLG_MASK 0x0000003F 1423 1424 struct block_device_operations { 1425 void (*submit_bio)(struct bio *bio); 1426 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob, 1427 unsigned int flags); 1428 int (*open) (struct block_device *, fmode_t); 1429 void (*release) (struct gendisk *, fmode_t); 1430 int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int); 1431 int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1432 int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); 1433 unsigned int (*check_events) (struct gendisk *disk, 1434 unsigned int clearing); 1435 void (*unlock_native_capacity) (struct gendisk *); 1436 int (*getgeo)(struct block_device *, struct hd_geometry *); 1437 int (*set_read_only)(struct block_device *bdev, bool ro); 1438 void (*free_disk)(struct gendisk *disk); 1439 /* this callback is with swap_lock and sometimes page table lock held */ 1440 void (*swap_slot_free_notify) (struct block_device *, unsigned long); 1441 int (*report_zones)(struct gendisk *, sector_t sector, 1442 unsigned int nr_zones, report_zones_cb cb, void *data); 1443 char *(*devnode)(struct gendisk *disk, umode_t *mode); 1444 /* returns the length of the identifier or a negative errno: */ 1445 int (*get_unique_id)(struct gendisk *disk, u8 id[16], 1446 enum blk_unique_id id_type); 1447 struct module *owner; 1448 const struct pr_ops *pr_ops; 1449 1450 /* 1451 * Special callback for probing GPT entry at a given sector. 1452 * Needed by Android devices, used by GPT scanner and MMC blk 1453 * driver. 1454 */ 1455 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector); 1456 }; 1457 1458 #ifdef CONFIG_COMPAT 1459 extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t, 1460 unsigned int, unsigned long); 1461 #else 1462 #define blkdev_compat_ptr_ioctl NULL 1463 #endif 1464 1465 extern int bdev_read_page(struct block_device *, sector_t, struct page *); 1466 extern int bdev_write_page(struct block_device *, sector_t, struct page *, 1467 struct writeback_control *); 1468 1469 static inline void blk_wake_io_task(struct task_struct *waiter) 1470 { 1471 /* 1472 * If we're polling, the task itself is doing the completions. For 1473 * that case, we don't need to signal a wakeup, it's enough to just 1474 * mark us as RUNNING. 1475 */ 1476 if (waiter == current) 1477 __set_current_state(TASK_RUNNING); 1478 else 1479 wake_up_process(waiter); 1480 } 1481 1482 unsigned long bdev_start_io_acct(struct block_device *bdev, 1483 unsigned int sectors, unsigned int op, 1484 unsigned long start_time); 1485 void bdev_end_io_acct(struct block_device *bdev, unsigned int op, 1486 unsigned long start_time); 1487 1488 void bio_start_io_acct_time(struct bio *bio, unsigned long start_time); 1489 unsigned long bio_start_io_acct(struct bio *bio); 1490 void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, 1491 struct block_device *orig_bdev); 1492 1493 /** 1494 * bio_end_io_acct - end I/O accounting for bio based drivers 1495 * @bio: bio to end account for 1496 * @start_time: start time returned by bio_start_io_acct() 1497 */ 1498 static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) 1499 { 1500 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev); 1501 } 1502 1503 int bdev_read_only(struct block_device *bdev); 1504 int set_blocksize(struct block_device *bdev, int size); 1505 1506 const char *bdevname(struct block_device *bdev, char *buffer); 1507 int lookup_bdev(const char *pathname, dev_t *dev); 1508 1509 void blkdev_show(struct seq_file *seqf, off_t offset); 1510 1511 #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */ 1512 #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */ 1513 #ifdef CONFIG_BLOCK 1514 #define BLKDEV_MAJOR_MAX 512 1515 #else 1516 #define BLKDEV_MAJOR_MAX 0 1517 #endif 1518 1519 struct block_device *blkdev_get_by_path(const char *path, fmode_t mode, 1520 void *holder); 1521 struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder); 1522 int bd_prepare_to_claim(struct block_device *bdev, void *holder); 1523 void bd_abort_claiming(struct block_device *bdev, void *holder); 1524 void blkdev_put(struct block_device *bdev, fmode_t mode); 1525 1526 /* just for blk-cgroup, don't use elsewhere */ 1527 struct block_device *blkdev_get_no_open(dev_t dev); 1528 void blkdev_put_no_open(struct block_device *bdev); 1529 1530 struct block_device *bdev_alloc(struct gendisk *disk, u8 partno); 1531 void bdev_add(struct block_device *bdev, dev_t dev); 1532 struct block_device *I_BDEV(struct inode *inode); 1533 int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart, 1534 loff_t lend); 1535 1536 #ifdef CONFIG_BLOCK 1537 void invalidate_bdev(struct block_device *bdev); 1538 int sync_blockdev(struct block_device *bdev); 1539 int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); 1540 int sync_blockdev_nowait(struct block_device *bdev); 1541 void sync_bdevs(bool wait); 1542 void printk_all_partitions(void); 1543 #else 1544 static inline void invalidate_bdev(struct block_device *bdev) 1545 { 1546 } 1547 static inline int sync_blockdev(struct block_device *bdev) 1548 { 1549 return 0; 1550 } 1551 static inline int sync_blockdev_nowait(struct block_device *bdev) 1552 { 1553 return 0; 1554 } 1555 static inline void sync_bdevs(bool wait) 1556 { 1557 } 1558 static inline void printk_all_partitions(void) 1559 { 1560 } 1561 #endif /* CONFIG_BLOCK */ 1562 1563 int fsync_bdev(struct block_device *bdev); 1564 1565 int freeze_bdev(struct block_device *bdev); 1566 int thaw_bdev(struct block_device *bdev); 1567 1568 struct io_comp_batch { 1569 struct request *req_list; 1570 bool need_ts; 1571 void (*complete)(struct io_comp_batch *); 1572 }; 1573 1574 #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { } 1575 1576 #endif /* _LINUX_BLKDEV_H */ 1577