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1/* SPDX-License-Identifier: GPL-2.0 */2/*3 * Portions Copyright (C) 1992 Drew Eckhardt4 */5#ifndef _LINUX_BLKDEV_H6#define _LINUX_BLKDEV_H7 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 29struct module;30struct request_queue;31struct elevator_queue;32struct blk_trace;33struct request;34struct sg_io_hdr;35struct blkcg_gq;36struct blk_flush_queue;37struct kiocb;38struct pr_ops;39struct rq_qos;40struct blk_queue_stats;41struct blk_stat_callback;42struct blk_crypto_profile;43 44extern const struct device_type disk_type;45extern const struct device_type part_type;46extern 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 653 54#define DISK_MAX_PARTS 25655#define DISK_NAME_LEN 3256 57#define PARTITION_META_INFO_VOLNAMELTH 6458/*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 64struct partition_meta_info {65 char uuid[PARTITION_META_INFO_UUIDLTH];66 u8 volname[PARTITION_META_INFO_VOLNAMELTH];67};68 69/**70 * DOC: genhd capability flags71 *72 * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to73 * removable media. When set, the device remains present even when media is not74 * inserted. Shall not be set for devices which are removed entirely when the75 * 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 using79 * blkdev_get*. Used for the underlying components of multipath devices.80 *81 * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not82 * scan for partitions from add_disk, and users can't add partitions manually.83 *84 */85enum {86 GENHD_FL_REMOVABLE = 1 << 0,87 GENHD_FL_HIDDEN = 1 << 1,88 GENHD_FL_NO_PART = 1 << 2,89};90 91enum {92 DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */93 DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */94};95 96enum {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 105struct disk_events;106struct badblocks;107 108enum blk_integrity_checksum {109 BLK_INTEGRITY_CSUM_NONE = 0,110 BLK_INTEGRITY_CSUM_IP = 1,111 BLK_INTEGRITY_CSUM_CRC = 2,112 BLK_INTEGRITY_CSUM_CRC64 = 3,113} __packed ;114 115struct blk_integrity {116 unsigned char flags;117 enum blk_integrity_checksum csum_type;118 unsigned char tuple_size;119 unsigned char pi_offset;120 unsigned char interval_exp;121 unsigned char tag_size;122};123 124typedef unsigned int __bitwise blk_mode_t;125 126/* open for reading */127#define BLK_OPEN_READ ((__force blk_mode_t)(1 << 0))128/* open for writing */129#define BLK_OPEN_WRITE ((__force blk_mode_t)(1 << 1))130/* open exclusively (vs other exclusive openers */131#define BLK_OPEN_EXCL ((__force blk_mode_t)(1 << 2))132/* opened with O_NDELAY */133#define BLK_OPEN_NDELAY ((__force blk_mode_t)(1 << 3))134/* open for "writes" only for ioctls (specialy hack for floppy.c) */135#define BLK_OPEN_WRITE_IOCTL ((__force blk_mode_t)(1 << 4))136/* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */137#define BLK_OPEN_RESTRICT_WRITES ((__force blk_mode_t)(1 << 5))138/* return partition scanning errors */139#define BLK_OPEN_STRICT_SCAN ((__force blk_mode_t)(1 << 6))140 141struct gendisk {142 /*143 * major/first_minor/minors should not be set by any new driver, the144 * block core will take care of allocating them automatically.145 */146 int major;147 int first_minor;148 int minors;149 150 char disk_name[DISK_NAME_LEN]; /* name of major driver */151 152 unsigned short events; /* supported events */153 unsigned short event_flags; /* flags related to event processing */154 155 struct xarray part_tbl;156 struct block_device *part0;157 158 const struct block_device_operations *fops;159 struct request_queue *queue;160 void *private_data;161 162 struct bio_set bio_split;163 164 int flags;165 unsigned long state;166#define GD_NEED_PART_SCAN 0167#define GD_READ_ONLY 1168#define GD_DEAD 2169#define GD_NATIVE_CAPACITY 3170#define GD_ADDED 4171#define GD_SUPPRESS_PART_SCAN 5172#define GD_OWNS_QUEUE 6173 174 struct mutex open_mutex; /* open/close mutex */175 unsigned open_partitions; /* number of open partitions */176 177 struct backing_dev_info *bdi;178 struct kobject queue_kobj; /* the queue/ directory */179 struct kobject *slave_dir;180#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED181 struct list_head slave_bdevs;182#endif183 struct timer_rand_state *random;184 atomic_t sync_io; /* RAID */185 struct disk_events *ev;186 187#ifdef CONFIG_BLK_DEV_ZONED188 /*189 * Zoned block device information. Reads of this information must be190 * protected with blk_queue_enter() / blk_queue_exit(). Modifying this191 * information is only allowed while no requests are being processed.192 * See also blk_mq_freeze_queue() and blk_mq_unfreeze_queue().193 */194 unsigned int nr_zones;195 unsigned int zone_capacity;196 unsigned int last_zone_capacity;197 unsigned long *conv_zones_bitmap;198 unsigned int zone_wplugs_hash_bits;199 spinlock_t zone_wplugs_lock;200 struct mempool_s *zone_wplugs_pool;201 struct hlist_head *zone_wplugs_hash;202 struct list_head zone_wplugs_err_list;203 struct work_struct zone_wplugs_work;204 struct workqueue_struct *zone_wplugs_wq;205#endif /* CONFIG_BLK_DEV_ZONED */206 207#if IS_ENABLED(CONFIG_CDROM)208 struct cdrom_device_info *cdi;209#endif210 int node_id;211 struct badblocks *bb;212 struct lockdep_map lockdep_map;213 u64 diskseq;214 blk_mode_t open_mode;215 216 /*217 * Independent sector access ranges. This is always NULL for218 * devices that do not have multiple independent access ranges.219 */220 struct blk_independent_access_ranges *ia_ranges;221};222 223/**224 * disk_openers - returns how many openers are there for a disk225 * @disk: disk to check226 *227 * This returns the number of openers for a disk. Note that this value is only228 * stable if disk->open_mutex is held.229 *230 * Note: Due to a quirk in the block layer open code, each open partition is231 * only counted once even if there are multiple openers.232 */233static inline unsigned int disk_openers(struct gendisk *disk)234{235 return atomic_read(&disk->part0->bd_openers);236}237 238/**239 * disk_has_partscan - return %true if partition scanning is enabled on a disk240 * @disk: disk to check241 *242 * Returns %true if partitions scanning is enabled for @disk, or %false if243 * partition scanning is disabled either permanently or temporarily.244 */245static inline bool disk_has_partscan(struct gendisk *disk)246{247 return !(disk->flags & (GENHD_FL_NO_PART | GENHD_FL_HIDDEN)) &&248 !test_bit(GD_SUPPRESS_PART_SCAN, &disk->state);249}250 251/*252 * The gendisk is refcounted by the part0 block_device, and the bd_device253 * therein is also used for device model presentation in sysfs.254 */255#define dev_to_disk(device) \256 (dev_to_bdev(device)->bd_disk)257#define disk_to_dev(disk) \258 (&((disk)->part0->bd_device))259 260#if IS_REACHABLE(CONFIG_CDROM)261#define disk_to_cdi(disk) ((disk)->cdi)262#else263#define disk_to_cdi(disk) NULL264#endif265 266static inline dev_t disk_devt(struct gendisk *disk)267{268 return MKDEV(disk->major, disk->first_minor);269}270 271/* blk_validate_limits() validates bsize, so drivers don't usually need to */272static inline int blk_validate_block_size(unsigned long bsize)273{274 if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))275 return -EINVAL;276 277 return 0;278}279 280static inline bool blk_op_is_passthrough(blk_opf_t op)281{282 op &= REQ_OP_MASK;283 return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;284}285 286/* flags set by the driver in queue_limits.features */287typedef unsigned int __bitwise blk_features_t;288 289/* supports a volatile write cache */290#define BLK_FEAT_WRITE_CACHE ((__force blk_features_t)(1u << 0))291 292/* supports passing on the FUA bit */293#define BLK_FEAT_FUA ((__force blk_features_t)(1u << 1))294 295/* rotational device (hard drive or floppy) */296#define BLK_FEAT_ROTATIONAL ((__force blk_features_t)(1u << 2))297 298/* contributes to the random number pool */299#define BLK_FEAT_ADD_RANDOM ((__force blk_features_t)(1u << 3))300 301/* do disk/partitions IO accounting */302#define BLK_FEAT_IO_STAT ((__force blk_features_t)(1u << 4))303 304/* don't modify data until writeback is done */305#define BLK_FEAT_STABLE_WRITES ((__force blk_features_t)(1u << 5))306 307/* always completes in submit context */308#define BLK_FEAT_SYNCHRONOUS ((__force blk_features_t)(1u << 6))309 310/* supports REQ_NOWAIT */311#define BLK_FEAT_NOWAIT ((__force blk_features_t)(1u << 7))312 313/* supports DAX */314#define BLK_FEAT_DAX ((__force blk_features_t)(1u << 8))315 316/* supports I/O polling */317#define BLK_FEAT_POLL ((__force blk_features_t)(1u << 9))318 319/* is a zoned device */320#define BLK_FEAT_ZONED ((__force blk_features_t)(1u << 10))321 322/* supports PCI(e) p2p requests */323#define BLK_FEAT_PCI_P2PDMA ((__force blk_features_t)(1u << 12))324 325/* skip this queue in blk_mq_(un)quiesce_tagset */326#define BLK_FEAT_SKIP_TAGSET_QUIESCE ((__force blk_features_t)(1u << 13))327 328/* bounce all highmem pages */329#define BLK_FEAT_BOUNCE_HIGH ((__force blk_features_t)(1u << 14))330 331/* undocumented magic for bcache */332#define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE \333 ((__force blk_features_t)(1u << 15))334 335/*336 * Flags automatically inherited when stacking limits.337 */338#define BLK_FEAT_INHERIT_MASK \339 (BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA | BLK_FEAT_ROTATIONAL | \340 BLK_FEAT_STABLE_WRITES | BLK_FEAT_ZONED | BLK_FEAT_BOUNCE_HIGH | \341 BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE)342 343/* internal flags in queue_limits.flags */344typedef unsigned int __bitwise blk_flags_t;345 346/* do not send FLUSH/FUA commands despite advertising a write cache */347#define BLK_FLAG_WRITE_CACHE_DISABLED ((__force blk_flags_t)(1u << 0))348 349/* I/O topology is misaligned */350#define BLK_FLAG_MISALIGNED ((__force blk_flags_t)(1u << 1))351 352struct queue_limits {353 blk_features_t features;354 blk_flags_t flags;355 unsigned long seg_boundary_mask;356 unsigned long virt_boundary_mask;357 358 unsigned int max_hw_sectors;359 unsigned int max_dev_sectors;360 unsigned int chunk_sectors;361 unsigned int max_sectors;362 unsigned int max_user_sectors;363 unsigned int max_segment_size;364 unsigned int physical_block_size;365 unsigned int logical_block_size;366 unsigned int alignment_offset;367 unsigned int io_min;368 unsigned int io_opt;369 unsigned int max_discard_sectors;370 unsigned int max_hw_discard_sectors;371 unsigned int max_user_discard_sectors;372 unsigned int max_secure_erase_sectors;373 unsigned int max_write_zeroes_sectors;374 unsigned int max_zone_append_sectors;375 unsigned int discard_granularity;376 unsigned int discard_alignment;377 unsigned int zone_write_granularity;378 379 /* atomic write limits */380 unsigned int atomic_write_hw_max;381 unsigned int atomic_write_max_sectors;382 unsigned int atomic_write_hw_boundary;383 unsigned int atomic_write_boundary_sectors;384 unsigned int atomic_write_hw_unit_min;385 unsigned int atomic_write_unit_min;386 unsigned int atomic_write_hw_unit_max;387 unsigned int atomic_write_unit_max;388 389 unsigned short max_segments;390 unsigned short max_integrity_segments;391 unsigned short max_discard_segments;392 393 unsigned int max_open_zones;394 unsigned int max_active_zones;395 396 /*397 * Drivers that set dma_alignment to less than 511 must be prepared to398 * handle individual bvec's that are not a multiple of a SECTOR_SIZE399 * due to possible offsets.400 */401 unsigned int dma_alignment;402 unsigned int dma_pad_mask;403 404 struct blk_integrity integrity;405};406 407typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,408 void *data);409 410#define BLK_ALL_ZONES ((unsigned int)-1)411int blkdev_report_zones(struct block_device *bdev, sector_t sector,412 unsigned int nr_zones, report_zones_cb cb, void *data);413int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,414 sector_t sectors, sector_t nr_sectors);415int blk_revalidate_disk_zones(struct gendisk *disk);416 417/*418 * Independent access ranges: struct blk_independent_access_range describes419 * a range of contiguous sectors that can be accessed using device command420 * execution resources that are independent from the resources used for421 * other access ranges. This is typically found with single-LUN multi-actuator422 * HDDs where each access range is served by a different set of heads.423 * The set of independent ranges supported by the device is defined using424 * struct blk_independent_access_ranges. The independent ranges must not overlap425 * and must include all sectors within the disk capacity (no sector holes426 * allowed).427 * For a device with multiple ranges, requests targeting sectors in different428 * ranges can be executed in parallel. A request can straddle an access range429 * boundary.430 */431struct blk_independent_access_range {432 struct kobject kobj;433 sector_t sector;434 sector_t nr_sectors;435};436 437struct blk_independent_access_ranges {438 struct kobject kobj;439 bool sysfs_registered;440 unsigned int nr_ia_ranges;441 struct blk_independent_access_range ia_range[];442};443 444struct request_queue {445 /*446 * The queue owner gets to use this for whatever they like.447 * ll_rw_blk doesn't touch it.448 */449 void *queuedata;450 451 struct elevator_queue *elevator;452 453 const struct blk_mq_ops *mq_ops;454 455 /* sw queues */456 struct blk_mq_ctx __percpu *queue_ctx;457 458 /*459 * various queue flags, see QUEUE_* below460 */461 unsigned long queue_flags;462 463 unsigned int rq_timeout;464 465 unsigned int queue_depth;466 467 refcount_t refs;468 469 /* hw dispatch queues */470 unsigned int nr_hw_queues;471 struct xarray hctx_table;472 473 struct percpu_ref q_usage_counter;474 475 struct request *last_merge;476 477 spinlock_t queue_lock;478 479 int quiesce_depth;480 481 struct gendisk *disk;482 483 /*484 * mq queue kobject485 */486 struct kobject *mq_kobj;487 488 struct queue_limits limits;489 490#ifdef CONFIG_PM491 struct device *dev;492 enum rpm_status rpm_status;493#endif494 495 /*496 * Number of contexts that have called blk_set_pm_only(). If this497 * counter is above zero then only RQF_PM requests are processed.498 */499 atomic_t pm_only;500 501 struct blk_queue_stats *stats;502 struct rq_qos *rq_qos;503 struct mutex rq_qos_mutex;504 505 /*506 * ida allocated id for this queue. Used to index queues from507 * ioctx.508 */509 int id;510 511 /*512 * queue settings513 */514 unsigned long nr_requests; /* Max # of requests */515 516#ifdef CONFIG_BLK_INLINE_ENCRYPTION517 struct blk_crypto_profile *crypto_profile;518 struct kobject *crypto_kobject;519#endif520 521 struct timer_list timeout;522 struct work_struct timeout_work;523 524 atomic_t nr_active_requests_shared_tags;525 526 struct blk_mq_tags *sched_shared_tags;527 528 struct list_head icq_list;529#ifdef CONFIG_BLK_CGROUP530 DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);531 struct blkcg_gq *root_blkg;532 struct list_head blkg_list;533 struct mutex blkcg_mutex;534#endif535 536 int node;537 538 spinlock_t requeue_lock;539 struct list_head requeue_list;540 struct delayed_work requeue_work;541 542#ifdef CONFIG_BLK_DEV_IO_TRACE543 struct blk_trace __rcu *blk_trace;544#endif545 /*546 * for flush operations547 */548 struct blk_flush_queue *fq;549 struct list_head flush_list;550 551 struct mutex sysfs_lock;552 struct mutex sysfs_dir_lock;553 struct mutex limits_lock;554 555 /*556 * for reusing dead hctx instance in case of updating557 * nr_hw_queues558 */559 struct list_head unused_hctx_list;560 spinlock_t unused_hctx_lock;561 562 int mq_freeze_depth;563 564#ifdef CONFIG_BLK_DEV_THROTTLING565 /* Throttle data */566 struct throtl_data *td;567#endif568 struct rcu_head rcu_head;569 wait_queue_head_t mq_freeze_wq;570 /*571 * Protect concurrent access to q_usage_counter by572 * percpu_ref_kill() and percpu_ref_reinit().573 */574 struct mutex mq_freeze_lock;575 576 struct blk_mq_tag_set *tag_set;577 struct list_head tag_set_list;578 579 struct dentry *debugfs_dir;580 struct dentry *sched_debugfs_dir;581 struct dentry *rqos_debugfs_dir;582 /*583 * Serializes all debugfs metadata operations using the above dentries.584 */585 struct mutex debugfs_mutex;586 587 bool mq_sysfs_init_done;588};589 590/* Keep blk_queue_flag_name[] in sync with the definitions below */591enum {592 QUEUE_FLAG_DYING, /* queue being torn down */593 QUEUE_FLAG_NOMERGES, /* disable merge attempts */594 QUEUE_FLAG_SAME_COMP, /* complete on same CPU-group */595 QUEUE_FLAG_FAIL_IO, /* fake timeout */596 QUEUE_FLAG_NOXMERGES, /* No extended merges */597 QUEUE_FLAG_SAME_FORCE, /* force complete on same CPU */598 QUEUE_FLAG_INIT_DONE, /* queue is initialized */599 QUEUE_FLAG_STATS, /* track IO start and completion times */600 QUEUE_FLAG_REGISTERED, /* queue has been registered to a disk */601 QUEUE_FLAG_QUIESCED, /* queue has been quiesced */602 QUEUE_FLAG_RQ_ALLOC_TIME, /* record rq->alloc_time_ns */603 QUEUE_FLAG_HCTX_ACTIVE, /* at least one blk-mq hctx is active */604 QUEUE_FLAG_SQ_SCHED, /* single queue style io dispatch */605 QUEUE_FLAG_MAX606};607 608#define QUEUE_FLAG_MQ_DEFAULT (1UL << QUEUE_FLAG_SAME_COMP)609 610void blk_queue_flag_set(unsigned int flag, struct request_queue *q);611void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);612 613#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)614#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)615#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)616#define blk_queue_noxmerges(q) \617 test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)618#define blk_queue_nonrot(q) (!((q)->limits.features & BLK_FEAT_ROTATIONAL))619#define blk_queue_io_stat(q) ((q)->limits.features & BLK_FEAT_IO_STAT)620#define blk_queue_dax(q) ((q)->limits.features & BLK_FEAT_DAX)621#define blk_queue_pci_p2pdma(q) ((q)->limits.features & BLK_FEAT_PCI_P2PDMA)622#ifdef CONFIG_BLK_RQ_ALLOC_TIME623#define blk_queue_rq_alloc_time(q) \624 test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)625#else626#define blk_queue_rq_alloc_time(q) false627#endif628 629#define blk_noretry_request(rq) \630 ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \631 REQ_FAILFAST_DRIVER))632#define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)633#define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)634#define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)635#define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)636#define blk_queue_skip_tagset_quiesce(q) \637 ((q)->limits.features & BLK_FEAT_SKIP_TAGSET_QUIESCE)638 639extern void blk_set_pm_only(struct request_queue *q);640extern void blk_clear_pm_only(struct request_queue *q);641 642#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)643 644#define dma_map_bvec(dev, bv, dir, attrs) \645 dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \646 (dir), (attrs))647 648static inline bool queue_is_mq(struct request_queue *q)649{650 return q->mq_ops;651}652 653#ifdef CONFIG_PM654static inline enum rpm_status queue_rpm_status(struct request_queue *q)655{656 return q->rpm_status;657}658#else659static inline enum rpm_status queue_rpm_status(struct request_queue *q)660{661 return RPM_ACTIVE;662}663#endif664 665static inline bool blk_queue_is_zoned(struct request_queue *q)666{667 return IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&668 (q->limits.features & BLK_FEAT_ZONED);669}670 671#ifdef CONFIG_BLK_DEV_ZONED672static inline unsigned int disk_nr_zones(struct gendisk *disk)673{674 return disk->nr_zones;675}676bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs);677#else /* CONFIG_BLK_DEV_ZONED */678static inline unsigned int disk_nr_zones(struct gendisk *disk)679{680 return 0;681}682static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs)683{684 return false;685}686#endif /* CONFIG_BLK_DEV_ZONED */687 688static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)689{690 if (!blk_queue_is_zoned(disk->queue))691 return 0;692 return sector >> ilog2(disk->queue->limits.chunk_sectors);693}694 695static inline unsigned int bdev_nr_zones(struct block_device *bdev)696{697 return disk_nr_zones(bdev->bd_disk);698}699 700static inline unsigned int bdev_max_open_zones(struct block_device *bdev)701{702 return bdev->bd_disk->queue->limits.max_open_zones;703}704 705static inline unsigned int bdev_max_active_zones(struct block_device *bdev)706{707 return bdev->bd_disk->queue->limits.max_active_zones;708}709 710static inline unsigned int blk_queue_depth(struct request_queue *q)711{712 if (q->queue_depth)713 return q->queue_depth;714 715 return q->nr_requests;716}717 718/*719 * default timeout for SG_IO if none specified720 */721#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)722#define BLK_MIN_SG_TIMEOUT (7 * HZ)723 724/* This should not be used directly - use rq_for_each_segment */725#define for_each_bio(_bio) \726 for (; _bio; _bio = _bio->bi_next)727 728int __must_check device_add_disk(struct device *parent, struct gendisk *disk,729 const struct attribute_group **groups);730static inline int __must_check add_disk(struct gendisk *disk)731{732 return device_add_disk(NULL, disk, NULL);733}734void del_gendisk(struct gendisk *gp);735void invalidate_disk(struct gendisk *disk);736void set_disk_ro(struct gendisk *disk, bool read_only);737void disk_uevent(struct gendisk *disk, enum kobject_action action);738 739static inline u8 bdev_partno(const struct block_device *bdev)740{741 return atomic_read(&bdev->__bd_flags) & BD_PARTNO;742}743 744static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag)745{746 return atomic_read(&bdev->__bd_flags) & flag;747}748 749static inline void bdev_set_flag(struct block_device *bdev, unsigned flag)750{751 atomic_or(flag, &bdev->__bd_flags);752}753 754static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag)755{756 atomic_andnot(flag, &bdev->__bd_flags);757}758 759static inline int get_disk_ro(struct gendisk *disk)760{761 return bdev_test_flag(disk->part0, BD_READ_ONLY) ||762 test_bit(GD_READ_ONLY, &disk->state);763}764 765static inline int bdev_read_only(struct block_device *bdev)766{767 return bdev_test_flag(bdev, BD_READ_ONLY) || get_disk_ro(bdev->bd_disk);768}769 770bool set_capacity_and_notify(struct gendisk *disk, sector_t size);771void disk_force_media_change(struct gendisk *disk);772void bdev_mark_dead(struct block_device *bdev, bool surprise);773 774void add_disk_randomness(struct gendisk *disk) __latent_entropy;775void rand_initialize_disk(struct gendisk *disk);776 777static inline sector_t get_start_sect(struct block_device *bdev)778{779 return bdev->bd_start_sect;780}781 782static inline sector_t bdev_nr_sectors(struct block_device *bdev)783{784 return bdev->bd_nr_sectors;785}786 787static inline loff_t bdev_nr_bytes(struct block_device *bdev)788{789 return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;790}791 792static inline sector_t get_capacity(struct gendisk *disk)793{794 return bdev_nr_sectors(disk->part0);795}796 797static inline u64 sb_bdev_nr_blocks(struct super_block *sb)798{799 return bdev_nr_sectors(sb->s_bdev) >>800 (sb->s_blocksize_bits - SECTOR_SHIFT);801}802 803int bdev_disk_changed(struct gendisk *disk, bool invalidate);804 805void put_disk(struct gendisk *disk);806struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node,807 struct lock_class_key *lkclass);808 809/**810 * blk_alloc_disk - allocate a gendisk structure811 * @lim: queue limits to be used for this disk.812 * @node_id: numa node to allocate on813 *814 * Allocate and pre-initialize a gendisk structure for use with BIO based815 * drivers.816 *817 * Returns an ERR_PTR on error, else the allocated disk.818 *819 * Context: can sleep820 */821#define blk_alloc_disk(lim, node_id) \822({ \823 static struct lock_class_key __key; \824 \825 __blk_alloc_disk(lim, node_id, &__key); \826})827 828int __register_blkdev(unsigned int major, const char *name,829 void (*probe)(dev_t devt));830#define register_blkdev(major, name) \831 __register_blkdev(major, name, NULL)832void unregister_blkdev(unsigned int major, const char *name);833 834bool disk_check_media_change(struct gendisk *disk);835void set_capacity(struct gendisk *disk, sector_t size);836 837#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED838int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);839void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);840#else841static inline int bd_link_disk_holder(struct block_device *bdev,842 struct gendisk *disk)843{844 return 0;845}846static inline void bd_unlink_disk_holder(struct block_device *bdev,847 struct gendisk *disk)848{849}850#endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */851 852dev_t part_devt(struct gendisk *disk, u8 partno);853void inc_diskseq(struct gendisk *disk);854void blk_request_module(dev_t devt);855 856extern int blk_register_queue(struct gendisk *disk);857extern void blk_unregister_queue(struct gendisk *disk);858void submit_bio_noacct(struct bio *bio);859struct bio *bio_split_to_limits(struct bio *bio);860 861extern int blk_lld_busy(struct request_queue *q);862extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);863extern void blk_queue_exit(struct request_queue *q);864extern void blk_sync_queue(struct request_queue *q);865 866/* Helper to convert REQ_OP_XXX to its string format XXX */867extern const char *blk_op_str(enum req_op op);868 869int blk_status_to_errno(blk_status_t status);870blk_status_t errno_to_blk_status(int errno);871const char *blk_status_to_str(blk_status_t status);872 873/* only poll the hardware once, don't continue until a completion was found */874#define BLK_POLL_ONESHOT (1 << 0)875int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);876int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,877 unsigned int flags);878 879static inline struct request_queue *bdev_get_queue(struct block_device *bdev)880{881 return bdev->bd_queue; /* this is never NULL */882}883 884/* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */885const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);886 887static inline unsigned int bio_zone_no(struct bio *bio)888{889 return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);890}891 892static inline bool bio_straddles_zones(struct bio *bio)893{894 return bio_sectors(bio) &&895 bio_zone_no(bio) !=896 disk_zone_no(bio->bi_bdev->bd_disk, bio_end_sector(bio) - 1);897}898 899/*900 * Return how much within the boundary is left to be used for I/O at a given901 * offset.902 */903static inline unsigned int blk_boundary_sectors_left(sector_t offset,904 unsigned int boundary_sectors)905{906 if (unlikely(!is_power_of_2(boundary_sectors)))907 return boundary_sectors - sector_div(offset, boundary_sectors);908 return boundary_sectors - (offset & (boundary_sectors - 1));909}910 911/**912 * queue_limits_start_update - start an atomic update of queue limits913 * @q: queue to update914 *915 * This functions starts an atomic update of the queue limits. It takes a lock916 * to prevent other updates and returns a snapshot of the current limits that917 * the caller can modify. The caller must call queue_limits_commit_update()918 * to finish the update.919 *920 * Context: process context. The caller must have frozen the queue or ensured921 * that there is outstanding I/O by other means.922 */923static inline struct queue_limits924queue_limits_start_update(struct request_queue *q)925{926 mutex_lock(&q->limits_lock);927 return q->limits;928}929int queue_limits_commit_update(struct request_queue *q,930 struct queue_limits *lim);931int queue_limits_set(struct request_queue *q, struct queue_limits *lim);932 933/**934 * queue_limits_cancel_update - cancel an atomic update of queue limits935 * @q: queue to update936 *937 * This functions cancels an atomic update of the queue limits started by938 * queue_limits_start_update() and should be used when an error occurs after939 * starting update.940 */941static inline void queue_limits_cancel_update(struct request_queue *q)942{943 mutex_unlock(&q->limits_lock);944}945 946/*947 * These helpers are for drivers that have sloppy feature negotiation and might948 * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O949 * completion handler when the device returned an indicator that the respective950 * feature is not actually supported. They are racy and the driver needs to951 * cope with that. Try to avoid this scheme if you can.952 */953static inline void blk_queue_disable_discard(struct request_queue *q)954{955 q->limits.max_discard_sectors = 0;956}957 958static inline void blk_queue_disable_secure_erase(struct request_queue *q)959{960 q->limits.max_secure_erase_sectors = 0;961}962 963static inline void blk_queue_disable_write_zeroes(struct request_queue *q)964{965 q->limits.max_write_zeroes_sectors = 0;966}967 968/*969 * Access functions for manipulating queue properties970 */971extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);972extern void blk_set_stacking_limits(struct queue_limits *lim);973extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,974 sector_t offset);975void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev,976 sector_t offset, const char *pfx);977extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);978 979struct blk_independent_access_ranges *980disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges);981void disk_set_independent_access_ranges(struct gendisk *disk,982 struct blk_independent_access_ranges *iars);983 984bool __must_check blk_get_queue(struct request_queue *);985extern void blk_put_queue(struct request_queue *);986 987void blk_mark_disk_dead(struct gendisk *disk);988 989#ifdef CONFIG_BLOCK990/*991 * blk_plug permits building a queue of related requests by holding the I/O992 * fragments for a short period. This allows merging of sequential requests993 * into single larger request. As the requests are moved from a per-task list to994 * the device's request_queue in a batch, this results in improved scalability995 * as the lock contention for request_queue lock is reduced.996 *997 * It is ok not to disable preemption when adding the request to the plug list998 * or when attempting a merge. For details, please see schedule() where999 * blk_flush_plug() is called.1000 */1001struct blk_plug {1002 struct request *mq_list; /* blk-mq requests */1003 1004 /* if ios_left is > 1, we can batch tag/rq allocations */1005 struct request *cached_rq;1006 u64 cur_ktime;1007 unsigned short nr_ios;1008 1009 unsigned short rq_count;1010 1011 bool multiple_queues;1012 bool has_elevator;1013 1014 struct list_head cb_list; /* md requires an unplug callback */1015};1016 1017struct blk_plug_cb;1018typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);1019struct blk_plug_cb {1020 struct list_head list;1021 blk_plug_cb_fn callback;1022 void *data;1023};1024extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,1025 void *data, int size);1026extern void blk_start_plug(struct blk_plug *);1027extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short);1028extern void blk_finish_plug(struct blk_plug *);1029 1030void __blk_flush_plug(struct blk_plug *plug, bool from_schedule);1031static inline void blk_flush_plug(struct blk_plug *plug, bool async)1032{1033 if (plug)1034 __blk_flush_plug(plug, async);1035}1036 1037/*1038 * tsk == current here1039 */1040static inline void blk_plug_invalidate_ts(struct task_struct *tsk)1041{1042 struct blk_plug *plug = tsk->plug;1043 1044 if (plug)1045 plug->cur_ktime = 0;1046 current->flags &= ~PF_BLOCK_TS;1047}1048 1049int blkdev_issue_flush(struct block_device *bdev);1050long nr_blockdev_pages(void);1051#else /* CONFIG_BLOCK */1052struct blk_plug {1053};1054 1055static inline void blk_start_plug_nr_ios(struct blk_plug *plug,1056 unsigned short nr_ios)1057{1058}1059 1060static inline void blk_start_plug(struct blk_plug *plug)1061{1062}1063 1064static inline void blk_finish_plug(struct blk_plug *plug)1065{1066}1067 1068static inline void blk_flush_plug(struct blk_plug *plug, bool async)1069{1070}1071 1072static inline void blk_plug_invalidate_ts(struct task_struct *tsk)1073{1074}1075 1076static inline int blkdev_issue_flush(struct block_device *bdev)1077{1078 return 0;1079}1080 1081static inline long nr_blockdev_pages(void)1082{1083 return 0;1084}1085#endif /* CONFIG_BLOCK */1086 1087extern void blk_io_schedule(void);1088 1089int blkdev_issue_discard(struct block_device *bdev, sector_t sector,1090 sector_t nr_sects, gfp_t gfp_mask);1091int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,1092 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop);1093int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector,1094 sector_t nr_sects, gfp_t gfp);1095 1096#define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */1097#define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */1098#define BLKDEV_ZERO_KILLABLE (1 << 2) /* interruptible by fatal signals */1099 1100extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,1101 sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,1102 unsigned flags);1103extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,1104 sector_t nr_sects, gfp_t gfp_mask, unsigned flags);1105 1106static inline int sb_issue_discard(struct super_block *sb, sector_t block,1107 sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)1108{1109 return blkdev_issue_discard(sb->s_bdev,1110 block << (sb->s_blocksize_bits -1111 SECTOR_SHIFT),1112 nr_blocks << (sb->s_blocksize_bits -1113 SECTOR_SHIFT),1114 gfp_mask);1115}1116static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,1117 sector_t nr_blocks, gfp_t gfp_mask)1118{1119 return blkdev_issue_zeroout(sb->s_bdev,1120 block << (sb->s_blocksize_bits -1121 SECTOR_SHIFT),1122 nr_blocks << (sb->s_blocksize_bits -1123 SECTOR_SHIFT),1124 gfp_mask, 0);1125}1126 1127static inline bool bdev_is_partition(struct block_device *bdev)1128{1129 return bdev_partno(bdev) != 0;1130}1131 1132enum blk_default_limits {1133 BLK_MAX_SEGMENTS = 128,1134 BLK_SAFE_MAX_SECTORS = 255,1135 BLK_MAX_SEGMENT_SIZE = 65536,1136 BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,1137};1138 1139/*1140 * Default upper limit for the software max_sectors limit used for1141 * regular file system I/O. This can be increased through sysfs.1142 *1143 * Not to be confused with the max_hw_sector limit that is entirely1144 * controlled by the driver, usually based on hardware limits.1145 */1146#define BLK_DEF_MAX_SECTORS_CAP 2560u1147 1148static inline unsigned long queue_segment_boundary(const struct request_queue *q)1149{1150 return q->limits.seg_boundary_mask;1151}1152 1153static inline unsigned long queue_virt_boundary(const struct request_queue *q)1154{1155 return q->limits.virt_boundary_mask;1156}1157 1158static inline unsigned int queue_max_sectors(const struct request_queue *q)1159{1160 return q->limits.max_sectors;1161}1162 1163static inline unsigned int queue_max_bytes(struct request_queue *q)1164{1165 return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;1166}1167 1168static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)1169{1170 return q->limits.max_hw_sectors;1171}1172 1173static inline unsigned short queue_max_segments(const struct request_queue *q)1174{1175 return q->limits.max_segments;1176}1177 1178static inline unsigned short queue_max_discard_segments(const struct request_queue *q)1179{1180 return q->limits.max_discard_segments;1181}1182 1183static inline unsigned int queue_max_segment_size(const struct request_queue *q)1184{1185 return q->limits.max_segment_size;1186}1187 1188static inline unsigned int1189queue_limits_max_zone_append_sectors(const struct queue_limits *l)1190{1191 unsigned int max_sectors = min(l->chunk_sectors, l->max_hw_sectors);1192 1193 return min_not_zero(l->max_zone_append_sectors, max_sectors);1194}1195 1196static inline unsigned int queue_max_zone_append_sectors(struct request_queue *q)1197{1198 if (!blk_queue_is_zoned(q))1199 return 0;1200 1201 return queue_limits_max_zone_append_sectors(&q->limits);1202}1203 1204static inline bool queue_emulates_zone_append(struct request_queue *q)1205{1206 return blk_queue_is_zoned(q) && !q->limits.max_zone_append_sectors;1207}1208 1209static inline bool bdev_emulates_zone_append(struct block_device *bdev)1210{1211 return queue_emulates_zone_append(bdev_get_queue(bdev));1212}1213 1214static inline unsigned int1215bdev_max_zone_append_sectors(struct block_device *bdev)1216{1217 return queue_max_zone_append_sectors(bdev_get_queue(bdev));1218}1219 1220static inline unsigned int bdev_max_segments(struct block_device *bdev)1221{1222 return queue_max_segments(bdev_get_queue(bdev));1223}1224 1225static inline unsigned queue_logical_block_size(const struct request_queue *q)1226{1227 return q->limits.logical_block_size;1228}1229 1230static inline unsigned int bdev_logical_block_size(struct block_device *bdev)1231{1232 return queue_logical_block_size(bdev_get_queue(bdev));1233}1234 1235static inline unsigned int queue_physical_block_size(const struct request_queue *q)1236{1237 return q->limits.physical_block_size;1238}1239 1240static inline unsigned int bdev_physical_block_size(struct block_device *bdev)1241{1242 return queue_physical_block_size(bdev_get_queue(bdev));1243}1244 1245static inline unsigned int queue_io_min(const struct request_queue *q)1246{1247 return q->limits.io_min;1248}1249 1250static inline int bdev_io_min(struct block_device *bdev)1251{1252 return queue_io_min(bdev_get_queue(bdev));1253}1254 1255static inline unsigned int queue_io_opt(const struct request_queue *q)1256{1257 return q->limits.io_opt;1258}1259 1260static inline int bdev_io_opt(struct block_device *bdev)1261{1262 return queue_io_opt(bdev_get_queue(bdev));1263}1264 1265static inline unsigned int1266queue_zone_write_granularity(const struct request_queue *q)1267{1268 return q->limits.zone_write_granularity;1269}1270 1271static inline unsigned int1272bdev_zone_write_granularity(struct block_device *bdev)1273{1274 return queue_zone_write_granularity(bdev_get_queue(bdev));1275}1276 1277int bdev_alignment_offset(struct block_device *bdev);1278unsigned int bdev_discard_alignment(struct block_device *bdev);1279 1280static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev)1281{1282 return bdev_get_queue(bdev)->limits.max_discard_sectors;1283}1284 1285static inline unsigned int bdev_discard_granularity(struct block_device *bdev)1286{1287 return bdev_get_queue(bdev)->limits.discard_granularity;1288}1289 1290static inline unsigned int1291bdev_max_secure_erase_sectors(struct block_device *bdev)1292{1293 return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;1294}1295 1296static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)1297{1298 return bdev_get_queue(bdev)->limits.max_write_zeroes_sectors;1299}1300 1301static inline bool bdev_nonrot(struct block_device *bdev)1302{1303 return blk_queue_nonrot(bdev_get_queue(bdev));1304}1305 1306static inline bool bdev_synchronous(struct block_device *bdev)1307{1308 return bdev->bd_disk->queue->limits.features & BLK_FEAT_SYNCHRONOUS;1309}1310 1311static inline bool bdev_stable_writes(struct block_device *bdev)1312{1313 struct request_queue *q = bdev_get_queue(bdev);1314 1315 if (IS_ENABLED(CONFIG_BLK_DEV_INTEGRITY) &&1316 q->limits.integrity.csum_type != BLK_INTEGRITY_CSUM_NONE)1317 return true;1318 return q->limits.features & BLK_FEAT_STABLE_WRITES;1319}1320 1321static inline bool blk_queue_write_cache(struct request_queue *q)1322{1323 return (q->limits.features & BLK_FEAT_WRITE_CACHE) &&1324 !(q->limits.flags & BLK_FLAG_WRITE_CACHE_DISABLED);1325}1326 1327static inline bool bdev_write_cache(struct block_device *bdev)1328{1329 return blk_queue_write_cache(bdev_get_queue(bdev));1330}1331 1332static inline bool bdev_fua(struct block_device *bdev)1333{1334 return bdev_get_queue(bdev)->limits.features & BLK_FEAT_FUA;1335}1336 1337static inline bool bdev_nowait(struct block_device *bdev)1338{1339 return bdev->bd_disk->queue->limits.features & BLK_FEAT_NOWAIT;1340}1341 1342static inline bool bdev_is_zoned(struct block_device *bdev)1343{1344 return blk_queue_is_zoned(bdev_get_queue(bdev));1345}1346 1347static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec)1348{1349 return disk_zone_no(bdev->bd_disk, sec);1350}1351 1352static inline sector_t bdev_zone_sectors(struct block_device *bdev)1353{1354 struct request_queue *q = bdev_get_queue(bdev);1355 1356 if (!blk_queue_is_zoned(q))1357 return 0;1358 return q->limits.chunk_sectors;1359}1360 1361static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev,1362 sector_t sector)1363{1364 return sector & (bdev_zone_sectors(bdev) - 1);1365}1366 1367static inline sector_t bio_offset_from_zone_start(struct bio *bio)1368{1369 return bdev_offset_from_zone_start(bio->bi_bdev,1370 bio->bi_iter.bi_sector);1371}1372 1373static inline bool bdev_is_zone_start(struct block_device *bdev,1374 sector_t sector)1375{1376 return bdev_offset_from_zone_start(bdev, sector) == 0;1377}1378 1379static inline int queue_dma_alignment(const struct request_queue *q)1380{1381 return q->limits.dma_alignment;1382}1383 1384static inline unsigned int1385queue_atomic_write_unit_max_bytes(const struct request_queue *q)1386{1387 return q->limits.atomic_write_unit_max;1388}1389 1390static inline unsigned int1391queue_atomic_write_unit_min_bytes(const struct request_queue *q)1392{1393 return q->limits.atomic_write_unit_min;1394}1395 1396static inline unsigned int1397queue_atomic_write_boundary_bytes(const struct request_queue *q)1398{1399 return q->limits.atomic_write_boundary_sectors << SECTOR_SHIFT;1400}1401 1402static inline unsigned int1403queue_atomic_write_max_bytes(const struct request_queue *q)1404{1405 return q->limits.atomic_write_max_sectors << SECTOR_SHIFT;1406}1407 1408static inline unsigned int bdev_dma_alignment(struct block_device *bdev)1409{1410 return queue_dma_alignment(bdev_get_queue(bdev));1411}1412 1413static inline bool bdev_iter_is_aligned(struct block_device *bdev,1414 struct iov_iter *iter)1415{1416 return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),1417 bdev_logical_block_size(bdev) - 1);1418}1419 1420static inline int blk_lim_dma_alignment_and_pad(struct queue_limits *lim)1421{1422 return lim->dma_alignment | lim->dma_pad_mask;1423}1424 1425static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,1426 unsigned int len)1427{1428 unsigned int alignment = blk_lim_dma_alignment_and_pad(&q->limits);1429 1430 return !(addr & alignment) && !(len & alignment);1431}1432 1433/* assumes size > 256 */1434static inline unsigned int blksize_bits(unsigned int size)1435{1436 return order_base_2(size >> SECTOR_SHIFT) + SECTOR_SHIFT;1437}1438 1439int kblockd_schedule_work(struct work_struct *work);1440int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);1441 1442#define MODULE_ALIAS_BLOCKDEV(major,minor) \1443 MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))1444#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \1445 MODULE_ALIAS("block-major-" __stringify(major) "-*")1446 1447#ifdef CONFIG_BLK_INLINE_ENCRYPTION1448 1449bool blk_crypto_register(struct blk_crypto_profile *profile,1450 struct request_queue *q);1451 1452#else /* CONFIG_BLK_INLINE_ENCRYPTION */1453 1454static inline bool blk_crypto_register(struct blk_crypto_profile *profile,1455 struct request_queue *q)1456{1457 return true;1458}1459 1460#endif /* CONFIG_BLK_INLINE_ENCRYPTION */1461 1462enum blk_unique_id {1463 /* these match the Designator Types specified in SPC */1464 BLK_UID_T10 = 1,1465 BLK_UID_EUI64 = 2,1466 BLK_UID_NAA = 3,1467};1468 1469struct block_device_operations {1470 void (*submit_bio)(struct bio *bio);1471 int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,1472 unsigned int flags);1473 int (*open)(struct gendisk *disk, blk_mode_t mode);1474 void (*release)(struct gendisk *disk);1475 int (*ioctl)(struct block_device *bdev, blk_mode_t mode,1476 unsigned cmd, unsigned long arg);1477 int (*compat_ioctl)(struct block_device *bdev, blk_mode_t mode,1478 unsigned cmd, unsigned long arg);1479 unsigned int (*check_events) (struct gendisk *disk,1480 unsigned int clearing);1481 void (*unlock_native_capacity) (struct gendisk *);1482 int (*getgeo)(struct block_device *, struct hd_geometry *);1483 int (*set_read_only)(struct block_device *bdev, bool ro);1484 void (*free_disk)(struct gendisk *disk);1485 /* this callback is with swap_lock and sometimes page table lock held */1486 void (*swap_slot_free_notify) (struct block_device *, unsigned long);1487 int (*report_zones)(struct gendisk *, sector_t sector,1488 unsigned int nr_zones, report_zones_cb cb, void *data);1489 char *(*devnode)(struct gendisk *disk, umode_t *mode);1490 /* returns the length of the identifier or a negative errno: */1491 int (*get_unique_id)(struct gendisk *disk, u8 id[16],1492 enum blk_unique_id id_type);1493 struct module *owner;1494 const struct pr_ops *pr_ops;1495 1496 /*1497 * Special callback for probing GPT entry at a given sector.1498 * Needed by Android devices, used by GPT scanner and MMC blk1499 * driver.1500 */1501 int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);1502};1503 1504#ifdef CONFIG_COMPAT1505extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t,1506 unsigned int, unsigned long);1507#else1508#define blkdev_compat_ptr_ioctl NULL1509#endif1510 1511static inline void blk_wake_io_task(struct task_struct *waiter)1512{1513 /*1514 * If we're polling, the task itself is doing the completions. For1515 * that case, we don't need to signal a wakeup, it's enough to just1516 * mark us as RUNNING.1517 */1518 if (waiter == current)1519 __set_current_state(TASK_RUNNING);1520 else1521 wake_up_process(waiter);1522}1523 1524unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op,1525 unsigned long start_time);1526void bdev_end_io_acct(struct block_device *bdev, enum req_op op,1527 unsigned int sectors, unsigned long start_time);1528 1529unsigned long bio_start_io_acct(struct bio *bio);1530void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time,1531 struct block_device *orig_bdev);1532 1533/**1534 * bio_end_io_acct - end I/O accounting for bio based drivers1535 * @bio: bio to end account for1536 * @start_time: start time returned by bio_start_io_acct()1537 */1538static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time)1539{1540 return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);1541}1542 1543int bdev_read_only(struct block_device *bdev);1544int set_blocksize(struct file *file, int size);1545 1546int lookup_bdev(const char *pathname, dev_t *dev);1547 1548void blkdev_show(struct seq_file *seqf, off_t offset);1549 1550#define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */1551#define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */1552#ifdef CONFIG_BLOCK1553#define BLKDEV_MAJOR_MAX 5121554#else1555#define BLKDEV_MAJOR_MAX 01556#endif1557 1558struct blk_holder_ops {1559 void (*mark_dead)(struct block_device *bdev, bool surprise);1560 1561 /*1562 * Sync the file system mounted on the block device.1563 */1564 void (*sync)(struct block_device *bdev);1565 1566 /*1567 * Freeze the file system mounted on the block device.1568 */1569 int (*freeze)(struct block_device *bdev);1570 1571 /*1572 * Thaw the file system mounted on the block device.1573 */1574 int (*thaw)(struct block_device *bdev);1575};1576 1577/*1578 * For filesystems using @fs_holder_ops, the @holder argument passed to1579 * helpers used to open and claim block devices via1580 * bd_prepare_to_claim() must point to a superblock.1581 */1582extern const struct blk_holder_ops fs_holder_ops;1583 1584/*1585 * Return the correct open flags for blkdev_get_by_* for super block flags1586 * as stored in sb->s_flags.1587 */1588#define sb_open_mode(flags) \1589 (BLK_OPEN_READ | BLK_OPEN_RESTRICT_WRITES | \1590 (((flags) & SB_RDONLY) ? 0 : BLK_OPEN_WRITE))1591 1592struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder,1593 const struct blk_holder_ops *hops);1594struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode,1595 void *holder, const struct blk_holder_ops *hops);1596int bd_prepare_to_claim(struct block_device *bdev, void *holder,1597 const struct blk_holder_ops *hops);1598void bd_abort_claiming(struct block_device *bdev, void *holder);1599 1600/* just for blk-cgroup, don't use elsewhere */1601struct block_device *blkdev_get_no_open(dev_t dev);1602void blkdev_put_no_open(struct block_device *bdev);1603 1604struct block_device *I_BDEV(struct inode *inode);1605struct block_device *file_bdev(struct file *bdev_file);1606bool disk_live(struct gendisk *disk);1607unsigned int block_size(struct block_device *bdev);1608 1609#ifdef CONFIG_BLOCK1610void invalidate_bdev(struct block_device *bdev);1611int sync_blockdev(struct block_device *bdev);1612int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend);1613int sync_blockdev_nowait(struct block_device *bdev);1614void sync_bdevs(bool wait);1615void bdev_statx(struct path *, struct kstat *, u32);1616void printk_all_partitions(void);1617int __init early_lookup_bdev(const char *pathname, dev_t *dev);1618#else1619static inline void invalidate_bdev(struct block_device *bdev)1620{1621}1622static inline int sync_blockdev(struct block_device *bdev)1623{1624 return 0;1625}1626static inline int sync_blockdev_nowait(struct block_device *bdev)1627{1628 return 0;1629}1630static inline void sync_bdevs(bool wait)1631{1632}1633static inline void bdev_statx(struct path *path, struct kstat *stat,1634 u32 request_mask)1635{1636}1637static inline void printk_all_partitions(void)1638{1639}1640static inline int early_lookup_bdev(const char *pathname, dev_t *dev)1641{1642 return -EINVAL;1643}1644#endif /* CONFIG_BLOCK */1645 1646int bdev_freeze(struct block_device *bdev);1647int bdev_thaw(struct block_device *bdev);1648void bdev_fput(struct file *bdev_file);1649 1650struct io_comp_batch {1651 struct request *req_list;1652 bool need_ts;1653 void (*complete)(struct io_comp_batch *);1654};1655 1656static inline bool bdev_can_atomic_write(struct block_device *bdev)1657{1658 struct request_queue *bd_queue = bdev->bd_queue;1659 struct queue_limits *limits = &bd_queue->limits;1660 1661 if (!limits->atomic_write_unit_min)1662 return false;1663 1664 if (bdev_is_partition(bdev)) {1665 sector_t bd_start_sect = bdev->bd_start_sect;1666 unsigned int alignment =1667 max(limits->atomic_write_unit_min,1668 limits->atomic_write_hw_boundary);1669 1670 if (!IS_ALIGNED(bd_start_sect, alignment >> SECTOR_SHIFT))1671 return false;1672 }1673 1674 return true;1675}1676 1677#define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }1678 1679#endif /* _LINUX_BLKDEV_H */1680