/* SPDX-License-Identifier: GPL-2.0 */ /* * Portions Copyright (C) 1992 Drew Eckhardt */ #ifndef _LINUX_BLKDEV_H #define _LINUX_BLKDEV_H #include <linux/types.h> #include <linux/blk_types.h> #include <linux/device.h> #include <linux/list.h> #include <linux/llist.h> #include <linux/minmax.h> #include <linux/timer.h> #include <linux/workqueue.h> #include <linux/wait.h> #include <linux/bio.h> #include <linux/gfp.h> #include <linux/kdev_t.h> #include <linux/rcupdate.h> #include <linux/percpu-refcount.h> #include <linux/blkzoned.h> #include <linux/sched.h> #include <linux/sbitmap.h> #include <linux/uuid.h> #include <linux/xarray.h> #include <linux/file.h> struct module; struct request_queue; struct elevator_queue; struct blk_trace; struct request; struct sg_io_hdr; struct blkcg_gq; struct blk_flush_queue; struct kiocb; struct pr_ops; struct rq_qos; struct blk_queue_stats; struct blk_stat_callback; struct blk_crypto_profile; extern const struct device_type disk_type; extern const struct device_type part_type; extern const struct class block_class; /* * Maximum number of blkcg policies allowed to be registered concurrently. * Defined here to simplify include dependency. */ #define BLKCG_MAX_POLS … #define DISK_MAX_PARTS … #define DISK_NAME_LEN … #define PARTITION_META_INFO_VOLNAMELTH … /* * Enough for the string representation of any kind of UUID plus NULL. * EFI UUID is 36 characters. MSDOS UUID is 11 characters. */ #define PARTITION_META_INFO_UUIDLTH … struct partition_meta_info { … }; /** * DOC: genhd capability flags * * ``GENHD_FL_REMOVABLE``: indicates that the block device gives access to * removable media. When set, the device remains present even when media is not * inserted. Shall not be set for devices which are removed entirely when the * media is removed. * * ``GENHD_FL_HIDDEN``: the block device is hidden; it doesn't produce events, * doesn't appear in sysfs, and can't be opened from userspace or using * blkdev_get*. Used for the underlying components of multipath devices. * * ``GENHD_FL_NO_PART``: partition support is disabled. The kernel will not * scan for partitions from add_disk, and users can't add partitions manually. * */ enum { … }; enum { … }; enum { … }; struct disk_events; struct badblocks; enum blk_integrity_checksum { … } __packed ; struct blk_integrity { … }; blk_mode_t; /* open for reading */ #define BLK_OPEN_READ … /* open for writing */ #define BLK_OPEN_WRITE … /* open exclusively (vs other exclusive openers */ #define BLK_OPEN_EXCL … /* opened with O_NDELAY */ #define BLK_OPEN_NDELAY … /* open for "writes" only for ioctls (specialy hack for floppy.c) */ #define BLK_OPEN_WRITE_IOCTL … /* open is exclusive wrt all other BLK_OPEN_WRITE opens to the device */ #define BLK_OPEN_RESTRICT_WRITES … /* return partition scanning errors */ #define BLK_OPEN_STRICT_SCAN … struct gendisk { … }; /** * disk_openers - returns how many openers are there for a disk * @disk: disk to check * * This returns the number of openers for a disk. Note that this value is only * stable if disk->open_mutex is held. * * Note: Due to a quirk in the block layer open code, each open partition is * only counted once even if there are multiple openers. */ static inline unsigned int disk_openers(struct gendisk *disk) { … } /** * disk_has_partscan - return %true if partition scanning is enabled on a disk * @disk: disk to check * * Returns %true if partitions scanning is enabled for @disk, or %false if * partition scanning is disabled either permanently or temporarily. */ static inline bool disk_has_partscan(struct gendisk *disk) { … } /* * The gendisk is refcounted by the part0 block_device, and the bd_device * therein is also used for device model presentation in sysfs. */ #define dev_to_disk(device) … #define disk_to_dev(disk) … #if IS_REACHABLE(CONFIG_CDROM) #define disk_to_cdi(disk) … #else #define disk_to_cdi … #endif static inline dev_t disk_devt(struct gendisk *disk) { … } /* blk_validate_limits() validates bsize, so drivers don't usually need to */ static inline int blk_validate_block_size(unsigned long bsize) { … } static inline bool blk_op_is_passthrough(blk_opf_t op) { … } /* flags set by the driver in queue_limits.features */ blk_features_t; /* supports a volatile write cache */ #define BLK_FEAT_WRITE_CACHE … /* supports passing on the FUA bit */ #define BLK_FEAT_FUA … /* rotational device (hard drive or floppy) */ #define BLK_FEAT_ROTATIONAL … /* contributes to the random number pool */ #define BLK_FEAT_ADD_RANDOM … /* do disk/partitions IO accounting */ #define BLK_FEAT_IO_STAT … /* don't modify data until writeback is done */ #define BLK_FEAT_STABLE_WRITES … /* always completes in submit context */ #define BLK_FEAT_SYNCHRONOUS … /* supports REQ_NOWAIT */ #define BLK_FEAT_NOWAIT … /* supports DAX */ #define BLK_FEAT_DAX … /* supports I/O polling */ #define BLK_FEAT_POLL … /* is a zoned device */ #define BLK_FEAT_ZONED … /* supports PCI(e) p2p requests */ #define BLK_FEAT_PCI_P2PDMA … /* skip this queue in blk_mq_(un)quiesce_tagset */ #define BLK_FEAT_SKIP_TAGSET_QUIESCE … /* bounce all highmem pages */ #define BLK_FEAT_BOUNCE_HIGH … /* undocumented magic for bcache */ #define BLK_FEAT_RAID_PARTIAL_STRIPES_EXPENSIVE … /* * Flags automatically inherited when stacking limits. */ #define BLK_FEAT_INHERIT_MASK … /* internal flags in queue_limits.flags */ blk_flags_t; /* do not send FLUSH/FUA commands despite advertising a write cache */ #define BLK_FLAG_WRITE_CACHE_DISABLED … /* I/O topology is misaligned */ #define BLK_FLAG_MISALIGNED … struct queue_limits { … }; report_zones_cb; #define BLK_ALL_ZONES … int blkdev_report_zones(struct block_device *bdev, sector_t sector, unsigned int nr_zones, report_zones_cb cb, void *data); int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op, sector_t sectors, sector_t nr_sectors); int blk_revalidate_disk_zones(struct gendisk *disk); /* * Independent access ranges: struct blk_independent_access_range describes * a range of contiguous sectors that can be accessed using device command * execution resources that are independent from the resources used for * other access ranges. This is typically found with single-LUN multi-actuator * HDDs where each access range is served by a different set of heads. * The set of independent ranges supported by the device is defined using * struct blk_independent_access_ranges. The independent ranges must not overlap * and must include all sectors within the disk capacity (no sector holes * allowed). * For a device with multiple ranges, requests targeting sectors in different * ranges can be executed in parallel. A request can straddle an access range * boundary. */ struct blk_independent_access_range { … }; struct blk_independent_access_ranges { … }; struct request_queue { … }; /* Keep blk_queue_flag_name[] in sync with the definitions below */ enum { … }; #define QUEUE_FLAG_MQ_DEFAULT … void blk_queue_flag_set(unsigned int flag, struct request_queue *q); void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); #define blk_queue_dying(q) … #define blk_queue_init_done(q) … #define blk_queue_nomerges(q) … #define blk_queue_noxmerges(q) … #define blk_queue_nonrot(q) … #define blk_queue_io_stat(q) … #define blk_queue_dax(q) … #define blk_queue_pci_p2pdma(q) … #ifdef CONFIG_BLK_RQ_ALLOC_TIME #define blk_queue_rq_alloc_time(q) … #else #define blk_queue_rq_alloc_time … #endif #define blk_noretry_request(rq) … #define blk_queue_quiesced(q) … #define blk_queue_pm_only(q) … #define blk_queue_registered(q) … #define blk_queue_sq_sched(q) … #define blk_queue_skip_tagset_quiesce(q) … extern void blk_set_pm_only(struct request_queue *q); extern void blk_clear_pm_only(struct request_queue *q); #define list_entry_rq(ptr) … #define dma_map_bvec(dev, bv, dir, attrs) … static inline bool queue_is_mq(struct request_queue *q) { … } #ifdef CONFIG_PM static inline enum rpm_status queue_rpm_status(struct request_queue *q) { … } #else static inline enum rpm_status queue_rpm_status(struct request_queue *q) { return RPM_ACTIVE; } #endif static inline bool blk_queue_is_zoned(struct request_queue *q) { … } #ifdef CONFIG_BLK_DEV_ZONED static inline unsigned int disk_nr_zones(struct gendisk *disk) { … } bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs); #else /* CONFIG_BLK_DEV_ZONED */ static inline unsigned int disk_nr_zones(struct gendisk *disk) { return 0; } static inline bool blk_zone_plug_bio(struct bio *bio, unsigned int nr_segs) { return false; } #endif /* CONFIG_BLK_DEV_ZONED */ static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector) { … } static inline unsigned int bdev_nr_zones(struct block_device *bdev) { … } static inline unsigned int bdev_max_open_zones(struct block_device *bdev) { … } static inline unsigned int bdev_max_active_zones(struct block_device *bdev) { … } static inline unsigned int blk_queue_depth(struct request_queue *q) { … } /* * default timeout for SG_IO if none specified */ #define BLK_DEFAULT_SG_TIMEOUT … #define BLK_MIN_SG_TIMEOUT … /* This should not be used directly - use rq_for_each_segment */ #define for_each_bio(_bio) … int __must_check device_add_disk(struct device *parent, struct gendisk *disk, const struct attribute_group **groups); static inline int __must_check add_disk(struct gendisk *disk) { … } void del_gendisk(struct gendisk *gp); void invalidate_disk(struct gendisk *disk); void set_disk_ro(struct gendisk *disk, bool read_only); void disk_uevent(struct gendisk *disk, enum kobject_action action); static inline u8 bdev_partno(const struct block_device *bdev) { … } static inline bool bdev_test_flag(const struct block_device *bdev, unsigned flag) { … } static inline void bdev_set_flag(struct block_device *bdev, unsigned flag) { … } static inline void bdev_clear_flag(struct block_device *bdev, unsigned flag) { … } static inline int get_disk_ro(struct gendisk *disk) { … } static inline int bdev_read_only(struct block_device *bdev) { … } bool set_capacity_and_notify(struct gendisk *disk, sector_t size); void disk_force_media_change(struct gendisk *disk); void bdev_mark_dead(struct block_device *bdev, bool surprise); void add_disk_randomness(struct gendisk *disk) __latent_entropy; void rand_initialize_disk(struct gendisk *disk); static inline sector_t get_start_sect(struct block_device *bdev) { … } static inline sector_t bdev_nr_sectors(struct block_device *bdev) { … } static inline loff_t bdev_nr_bytes(struct block_device *bdev) { … } static inline sector_t get_capacity(struct gendisk *disk) { … } static inline u64 sb_bdev_nr_blocks(struct super_block *sb) { … } int bdev_disk_changed(struct gendisk *disk, bool invalidate); void put_disk(struct gendisk *disk); struct gendisk *__blk_alloc_disk(struct queue_limits *lim, int node, struct lock_class_key *lkclass); /** * blk_alloc_disk - allocate a gendisk structure * @lim: queue limits to be used for this disk. * @node_id: numa node to allocate on * * Allocate and pre-initialize a gendisk structure for use with BIO based * drivers. * * Returns an ERR_PTR on error, else the allocated disk. * * Context: can sleep */ #define blk_alloc_disk(lim, node_id) … int __register_blkdev(unsigned int major, const char *name, void (*probe)(dev_t devt)); #define register_blkdev(major, name) … void unregister_blkdev(unsigned int major, const char *name); bool disk_check_media_change(struct gendisk *disk); void set_capacity(struct gendisk *disk, sector_t size); #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk); void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk); #else static inline int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) { return 0; } static inline void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk) { } #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */ dev_t part_devt(struct gendisk *disk, u8 partno); void inc_diskseq(struct gendisk *disk); void blk_request_module(dev_t devt); extern int blk_register_queue(struct gendisk *disk); extern void blk_unregister_queue(struct gendisk *disk); void submit_bio_noacct(struct bio *bio); struct bio *bio_split_to_limits(struct bio *bio); extern int blk_lld_busy(struct request_queue *q); extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); extern void blk_queue_exit(struct request_queue *q); extern void blk_sync_queue(struct request_queue *q); /* Helper to convert REQ_OP_XXX to its string format XXX */ extern const char *blk_op_str(enum req_op op); int blk_status_to_errno(blk_status_t status); blk_status_t errno_to_blk_status(int errno); const char *blk_status_to_str(blk_status_t status); /* only poll the hardware once, don't continue until a completion was found */ #define BLK_POLL_ONESHOT … int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags); int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob, unsigned int flags); static inline struct request_queue *bdev_get_queue(struct block_device *bdev) { … } /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */ const char *blk_zone_cond_str(enum blk_zone_cond zone_cond); static inline unsigned int bio_zone_no(struct bio *bio) { … } static inline bool bio_straddles_zones(struct bio *bio) { … } /* * Return how much within the boundary is left to be used for I/O at a given * offset. */ static inline unsigned int blk_boundary_sectors_left(sector_t offset, unsigned int boundary_sectors) { … } /** * queue_limits_start_update - start an atomic update of queue limits * @q: queue to update * * This functions starts an atomic update of the queue limits. It takes a lock * to prevent other updates and returns a snapshot of the current limits that * the caller can modify. The caller must call queue_limits_commit_update() * to finish the update. * * Context: process context. The caller must have frozen the queue or ensured * that there is outstanding I/O by other means. */ static inline struct queue_limits queue_limits_start_update(struct request_queue *q) { … } int queue_limits_commit_update(struct request_queue *q, struct queue_limits *lim); int queue_limits_set(struct request_queue *q, struct queue_limits *lim); /** * queue_limits_cancel_update - cancel an atomic update of queue limits * @q: queue to update * * This functions cancels an atomic update of the queue limits started by * queue_limits_start_update() and should be used when an error occurs after * starting update. */ static inline void queue_limits_cancel_update(struct request_queue *q) { … } /* * These helpers are for drivers that have sloppy feature negotiation and might * have to disable DISCARD, WRITE_ZEROES or SECURE_DISCARD from the I/O * completion handler when the device returned an indicator that the respective * feature is not actually supported. They are racy and the driver needs to * cope with that. Try to avoid this scheme if you can. */ static inline void blk_queue_disable_discard(struct request_queue *q) { … } static inline void blk_queue_disable_secure_erase(struct request_queue *q) { … } static inline void blk_queue_disable_write_zeroes(struct request_queue *q) { … } /* * Access functions for manipulating queue properties */ extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth); extern void blk_set_stacking_limits(struct queue_limits *lim); extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b, sector_t offset); void queue_limits_stack_bdev(struct queue_limits *t, struct block_device *bdev, sector_t offset, const char *pfx); extern void blk_queue_rq_timeout(struct request_queue *, unsigned int); struct blk_independent_access_ranges * disk_alloc_independent_access_ranges(struct gendisk *disk, int nr_ia_ranges); void disk_set_independent_access_ranges(struct gendisk *disk, struct blk_independent_access_ranges *iars); bool __must_check blk_get_queue(struct request_queue *); extern void blk_put_queue(struct request_queue *); void blk_mark_disk_dead(struct gendisk *disk); #ifdef CONFIG_BLOCK /* * blk_plug permits building a queue of related requests by holding the I/O * fragments for a short period. This allows merging of sequential requests * into single larger request. As the requests are moved from a per-task list to * the device's request_queue in a batch, this results in improved scalability * as the lock contention for request_queue lock is reduced. * * It is ok not to disable preemption when adding the request to the plug list * or when attempting a merge. For details, please see schedule() where * blk_flush_plug() is called. */ struct blk_plug { … }; struct blk_plug_cb; blk_plug_cb_fn; struct blk_plug_cb { … }; extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug, void *data, int size); extern void blk_start_plug(struct blk_plug *); extern void blk_start_plug_nr_ios(struct blk_plug *, unsigned short); extern void blk_finish_plug(struct blk_plug *); void __blk_flush_plug(struct blk_plug *plug, bool from_schedule); static inline void blk_flush_plug(struct blk_plug *plug, bool async) { … } /* * tsk == current here */ static inline void blk_plug_invalidate_ts(struct task_struct *tsk) { … } int blkdev_issue_flush(struct block_device *bdev); long nr_blockdev_pages(void); #else /* CONFIG_BLOCK */ struct blk_plug { }; static inline void blk_start_plug_nr_ios(struct blk_plug *plug, unsigned short nr_ios) { } static inline void blk_start_plug(struct blk_plug *plug) { } static inline void blk_finish_plug(struct blk_plug *plug) { } static inline void blk_flush_plug(struct blk_plug *plug, bool async) { } static inline void blk_plug_invalidate_ts(struct task_struct *tsk) { } static inline int blkdev_issue_flush(struct block_device *bdev) { return 0; } static inline long nr_blockdev_pages(void) { return 0; } #endif /* CONFIG_BLOCK */ extern void blk_io_schedule(void); int blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask); int __blkdev_issue_discard(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop); int blkdev_issue_secure_erase(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp); #define BLKDEV_ZERO_NOUNMAP … #define BLKDEV_ZERO_NOFALLBACK … #define BLKDEV_ZERO_KILLABLE … extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, struct bio **biop, unsigned flags); extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, unsigned flags); static inline int sb_issue_discard(struct super_block *sb, sector_t block, sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags) { … } static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, sector_t nr_blocks, gfp_t gfp_mask) { … } static inline bool bdev_is_partition(struct block_device *bdev) { … } enum blk_default_limits { … }; /* * Default upper limit for the software max_sectors limit used for * regular file system I/O. This can be increased through sysfs. * * Not to be confused with the max_hw_sector limit that is entirely * controlled by the driver, usually based on hardware limits. */ #define BLK_DEF_MAX_SECTORS_CAP … static inline unsigned long queue_segment_boundary(const struct request_queue *q) { … } static inline unsigned long queue_virt_boundary(const struct request_queue *q) { … } static inline unsigned int queue_max_sectors(const struct request_queue *q) { … } static inline unsigned int queue_max_bytes(struct request_queue *q) { … } static inline unsigned int queue_max_hw_sectors(const struct request_queue *q) { … } static inline unsigned short queue_max_segments(const struct request_queue *q) { … } static inline unsigned short queue_max_discard_segments(const struct request_queue *q) { … } static inline unsigned int queue_max_segment_size(const struct request_queue *q) { … } static inline unsigned int queue_limits_max_zone_append_sectors(const struct queue_limits *l) { … } static inline unsigned int queue_max_zone_append_sectors(struct request_queue *q) { … } static inline bool queue_emulates_zone_append(struct request_queue *q) { … } static inline bool bdev_emulates_zone_append(struct block_device *bdev) { … } static inline unsigned int bdev_max_zone_append_sectors(struct block_device *bdev) { … } static inline unsigned int bdev_max_segments(struct block_device *bdev) { … } static inline unsigned queue_logical_block_size(const struct request_queue *q) { … } static inline unsigned int bdev_logical_block_size(struct block_device *bdev) { … } static inline unsigned int queue_physical_block_size(const struct request_queue *q) { … } static inline unsigned int bdev_physical_block_size(struct block_device *bdev) { … } static inline unsigned int queue_io_min(const struct request_queue *q) { … } static inline int bdev_io_min(struct block_device *bdev) { … } static inline unsigned int queue_io_opt(const struct request_queue *q) { … } static inline int bdev_io_opt(struct block_device *bdev) { … } static inline unsigned int queue_zone_write_granularity(const struct request_queue *q) { … } static inline unsigned int bdev_zone_write_granularity(struct block_device *bdev) { … } int bdev_alignment_offset(struct block_device *bdev); unsigned int bdev_discard_alignment(struct block_device *bdev); static inline unsigned int bdev_max_discard_sectors(struct block_device *bdev) { … } static inline unsigned int bdev_discard_granularity(struct block_device *bdev) { … } static inline unsigned int bdev_max_secure_erase_sectors(struct block_device *bdev) { … } static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev) { … } static inline bool bdev_nonrot(struct block_device *bdev) { … } static inline bool bdev_synchronous(struct block_device *bdev) { … } static inline bool bdev_stable_writes(struct block_device *bdev) { … } static inline bool blk_queue_write_cache(struct request_queue *q) { … } static inline bool bdev_write_cache(struct block_device *bdev) { … } static inline bool bdev_fua(struct block_device *bdev) { … } static inline bool bdev_nowait(struct block_device *bdev) { … } static inline bool bdev_is_zoned(struct block_device *bdev) { … } static inline unsigned int bdev_zone_no(struct block_device *bdev, sector_t sec) { … } static inline sector_t bdev_zone_sectors(struct block_device *bdev) { … } static inline sector_t bdev_offset_from_zone_start(struct block_device *bdev, sector_t sector) { … } static inline sector_t bio_offset_from_zone_start(struct bio *bio) { … } static inline bool bdev_is_zone_start(struct block_device *bdev, sector_t sector) { … } static inline int queue_dma_alignment(const struct request_queue *q) { … } static inline unsigned int queue_atomic_write_unit_max_bytes(const struct request_queue *q) { … } static inline unsigned int queue_atomic_write_unit_min_bytes(const struct request_queue *q) { … } static inline unsigned int queue_atomic_write_boundary_bytes(const struct request_queue *q) { … } static inline unsigned int queue_atomic_write_max_bytes(const struct request_queue *q) { … } static inline unsigned int bdev_dma_alignment(struct block_device *bdev) { … } static inline bool bdev_iter_is_aligned(struct block_device *bdev, struct iov_iter *iter) { … } static inline int blk_lim_dma_alignment_and_pad(struct queue_limits *lim) { … } static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr, unsigned int len) { … } /* assumes size > 256 */ static inline unsigned int blksize_bits(unsigned int size) { … } int kblockd_schedule_work(struct work_struct *work); int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay); #define MODULE_ALIAS_BLOCKDEV(major,minor) … #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) … #ifdef CONFIG_BLK_INLINE_ENCRYPTION bool blk_crypto_register(struct blk_crypto_profile *profile, struct request_queue *q); #else /* CONFIG_BLK_INLINE_ENCRYPTION */ static inline bool blk_crypto_register(struct blk_crypto_profile *profile, struct request_queue *q) { return true; } #endif /* CONFIG_BLK_INLINE_ENCRYPTION */ enum blk_unique_id { … }; struct block_device_operations { … }; #ifdef CONFIG_COMPAT extern int blkdev_compat_ptr_ioctl(struct block_device *, blk_mode_t, unsigned int, unsigned long); #else #define blkdev_compat_ptr_ioctl … #endif static inline void blk_wake_io_task(struct task_struct *waiter) { … } unsigned long bdev_start_io_acct(struct block_device *bdev, enum req_op op, unsigned long start_time); void bdev_end_io_acct(struct block_device *bdev, enum req_op op, unsigned int sectors, unsigned long start_time); unsigned long bio_start_io_acct(struct bio *bio); void bio_end_io_acct_remapped(struct bio *bio, unsigned long start_time, struct block_device *orig_bdev); /** * bio_end_io_acct - end I/O accounting for bio based drivers * @bio: bio to end account for * @start_time: start time returned by bio_start_io_acct() */ static inline void bio_end_io_acct(struct bio *bio, unsigned long start_time) { … } int bdev_read_only(struct block_device *bdev); int set_blocksize(struct file *file, int size); int lookup_bdev(const char *pathname, dev_t *dev); void blkdev_show(struct seq_file *seqf, off_t offset); #define BDEVNAME_SIZE … #define BDEVT_SIZE … #ifdef CONFIG_BLOCK #define BLKDEV_MAJOR_MAX … #else #define BLKDEV_MAJOR_MAX … #endif struct blk_holder_ops { … }; /* * For filesystems using @fs_holder_ops, the @holder argument passed to * helpers used to open and claim block devices via * bd_prepare_to_claim() must point to a superblock. */ extern const struct blk_holder_ops fs_holder_ops; /* * Return the correct open flags for blkdev_get_by_* for super block flags * as stored in sb->s_flags. */ #define sb_open_mode(flags) … struct file *bdev_file_open_by_dev(dev_t dev, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops); struct file *bdev_file_open_by_path(const char *path, blk_mode_t mode, void *holder, const struct blk_holder_ops *hops); int bd_prepare_to_claim(struct block_device *bdev, void *holder, const struct blk_holder_ops *hops); void bd_abort_claiming(struct block_device *bdev, void *holder); /* just for blk-cgroup, don't use elsewhere */ struct block_device *blkdev_get_no_open(dev_t dev); void blkdev_put_no_open(struct block_device *bdev); struct block_device *I_BDEV(struct inode *inode); struct block_device *file_bdev(struct file *bdev_file); bool disk_live(struct gendisk *disk); unsigned int block_size(struct block_device *bdev); #ifdef CONFIG_BLOCK void invalidate_bdev(struct block_device *bdev); int sync_blockdev(struct block_device *bdev); int sync_blockdev_range(struct block_device *bdev, loff_t lstart, loff_t lend); int sync_blockdev_nowait(struct block_device *bdev); void sync_bdevs(bool wait); void bdev_statx(struct path *, struct kstat *, u32); void printk_all_partitions(void); int __init early_lookup_bdev(const char *pathname, dev_t *dev); #else static inline void invalidate_bdev(struct block_device *bdev) { } static inline int sync_blockdev(struct block_device *bdev) { return 0; } static inline int sync_blockdev_nowait(struct block_device *bdev) { return 0; } static inline void sync_bdevs(bool wait) { } static inline void bdev_statx(struct path *path, struct kstat *stat, u32 request_mask) { } static inline void printk_all_partitions(void) { } static inline int early_lookup_bdev(const char *pathname, dev_t *dev) { return -EINVAL; } #endif /* CONFIG_BLOCK */ int bdev_freeze(struct block_device *bdev); int bdev_thaw(struct block_device *bdev); void bdev_fput(struct file *bdev_file); struct io_comp_batch { … }; static inline bool bdev_can_atomic_write(struct block_device *bdev) { … } #define DEFINE_IO_COMP_BATCH(name) … #endif /* _LINUX_BLKDEV_H */
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