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- /* 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/srcu.h>
- #include <linux/uuid.h>
- #include <linux/xarray.h>
- #include <linux/android_kabi.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 struct device_type part_type;
- extern struct class block_class;
- /* Must be consistent with blk_mq_poll_stats_bkt() */
- #define BLK_MQ_POLL_STATS_BKTS 16
- /* Doing classic polling */
- #define BLK_MQ_POLL_CLASSIC -1
- /*
- * Maximum number of blkcg policies allowed to be registered concurrently.
- * Defined here to simplify include dependency.
- */
- #define BLKCG_MAX_POLS 6
- #define DISK_MAX_PARTS 256
- #define DISK_NAME_LEN 32
- #define PARTITION_META_INFO_VOLNAMELTH 64
- /*
- * 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 (UUID_STRING_LEN + 1)
- struct partition_meta_info {
- char uuid[PARTITION_META_INFO_UUIDLTH];
- u8 volname[PARTITION_META_INFO_VOLNAMELTH];
- };
- /**
- * 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 {
- GENHD_FL_REMOVABLE = 1 << 0,
- GENHD_FL_HIDDEN = 1 << 1,
- GENHD_FL_NO_PART = 1 << 2,
- };
- enum {
- DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
- DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
- };
- enum {
- /* Poll even if events_poll_msecs is unset */
- DISK_EVENT_FLAG_POLL = 1 << 0,
- /* Forward events to udev */
- DISK_EVENT_FLAG_UEVENT = 1 << 1,
- /* Block event polling when open for exclusive write */
- DISK_EVENT_FLAG_BLOCK_ON_EXCL_WRITE = 1 << 2,
- };
- struct disk_events;
- struct badblocks;
- struct blk_integrity {
- const struct blk_integrity_profile *profile;
- unsigned char flags;
- unsigned char tuple_size;
- unsigned char interval_exp;
- unsigned char tag_size;
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- };
- struct gendisk {
- /*
- * major/first_minor/minors should not be set by any new driver, the
- * block core will take care of allocating them automatically.
- */
- int major;
- int first_minor;
- int minors;
- char disk_name[DISK_NAME_LEN]; /* name of major driver */
- unsigned short events; /* supported events */
- unsigned short event_flags; /* flags related to event processing */
- struct xarray part_tbl;
- struct block_device *part0;
- const struct block_device_operations *fops;
- struct request_queue *queue;
- void *private_data;
- struct bio_set bio_split;
- int flags;
- unsigned long state;
- #define GD_NEED_PART_SCAN 0
- #define GD_READ_ONLY 1
- #define GD_DEAD 2
- #define GD_NATIVE_CAPACITY 3
- #define GD_ADDED 4
- #define GD_SUPPRESS_PART_SCAN 5
- #define GD_OWNS_QUEUE 6
- struct mutex open_mutex; /* open/close mutex */
- unsigned open_partitions; /* number of open partitions */
- struct backing_dev_info *bdi;
- struct kobject *slave_dir;
- #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
- struct list_head slave_bdevs;
- #endif
- struct timer_rand_state *random;
- atomic_t sync_io; /* RAID */
- struct disk_events *ev;
- #ifdef CONFIG_BLK_DEV_INTEGRITY
- struct kobject integrity_kobj;
- #endif /* CONFIG_BLK_DEV_INTEGRITY */
- #ifdef CONFIG_BLK_DEV_ZONED
- /*
- * Zoned block device information for request dispatch control.
- * nr_zones is the total number of zones of the device. This is always
- * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
- * bits which indicates if a zone is conventional (bit set) or
- * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
- * bits which indicates if a zone is write locked, that is, if a write
- * request targeting the zone was dispatched.
- *
- * Reads of this information must be protected with blk_queue_enter() /
- * blk_queue_exit(). Modifying this information is only allowed while
- * no requests are being processed. See also blk_mq_freeze_queue() and
- * blk_mq_unfreeze_queue().
- */
- unsigned int nr_zones;
- unsigned int max_open_zones;
- unsigned int max_active_zones;
- unsigned long *conv_zones_bitmap;
- unsigned long *seq_zones_wlock;
- #endif /* CONFIG_BLK_DEV_ZONED */
- #if IS_ENABLED(CONFIG_CDROM)
- struct cdrom_device_info *cdi;
- #endif
- int node_id;
- struct badblocks *bb;
- struct lockdep_map lockdep_map;
- u64 diskseq;
- /*
- * Independent sector access ranges. This is always NULL for
- * devices that do not have multiple independent access ranges.
- */
- struct blk_independent_access_ranges *ia_ranges;
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- ANDROID_KABI_RESERVE(3);
- ANDROID_KABI_RESERVE(4);
- };
- static inline bool disk_live(struct gendisk *disk)
- {
- return !inode_unhashed(disk->part0->bd_inode);
- }
- /**
- * 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)
- {
- return atomic_read(&disk->part0->bd_openers);
- }
- /*
- * 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) \
- (dev_to_bdev(device)->bd_disk)
- #define disk_to_dev(disk) \
- (&((disk)->part0->bd_device))
- #if IS_REACHABLE(CONFIG_CDROM)
- #define disk_to_cdi(disk) ((disk)->cdi)
- #else
- #define disk_to_cdi(disk) NULL
- #endif
- static inline dev_t disk_devt(struct gendisk *disk)
- {
- return MKDEV(disk->major, disk->first_minor);
- }
- static inline int blk_validate_block_size(unsigned long bsize)
- {
- if (bsize < 512 || bsize > PAGE_SIZE || !is_power_of_2(bsize))
- return -EINVAL;
- return 0;
- }
- static inline bool blk_op_is_passthrough(blk_opf_t op)
- {
- op &= REQ_OP_MASK;
- return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
- }
- /*
- * Zoned block device models (zoned limit).
- *
- * Note: This needs to be ordered from the least to the most severe
- * restrictions for the inheritance in blk_stack_limits() to work.
- */
- enum blk_zoned_model {
- BLK_ZONED_NONE = 0, /* Regular block device */
- BLK_ZONED_HA, /* Host-aware zoned block device */
- BLK_ZONED_HM, /* Host-managed zoned block device */
- };
- /*
- * BLK_BOUNCE_NONE: never bounce (default)
- * BLK_BOUNCE_HIGH: bounce all highmem pages
- */
- enum blk_bounce {
- BLK_BOUNCE_NONE,
- BLK_BOUNCE_HIGH,
- };
- struct queue_limits {
- enum blk_bounce bounce;
- unsigned long seg_boundary_mask;
- unsigned long virt_boundary_mask;
- unsigned int max_hw_sectors;
- unsigned int max_dev_sectors;
- unsigned int chunk_sectors;
- unsigned int max_sectors;
- unsigned int max_segment_size;
- unsigned int physical_block_size;
- unsigned int logical_block_size;
- unsigned int alignment_offset;
- unsigned int io_min;
- unsigned int io_opt;
- unsigned int max_discard_sectors;
- unsigned int max_hw_discard_sectors;
- unsigned int max_secure_erase_sectors;
- unsigned int max_write_zeroes_sectors;
- unsigned int max_zone_append_sectors;
- unsigned int discard_granularity;
- unsigned int discard_alignment;
- unsigned int zone_write_granularity;
- unsigned short max_segments;
- unsigned short max_integrity_segments;
- unsigned short max_discard_segments;
- unsigned char misaligned;
- unsigned char discard_misaligned;
- unsigned char raid_partial_stripes_expensive;
- enum blk_zoned_model zoned;
- /*
- * Drivers that set dma_alignment to less than 511 must be prepared to
- * handle individual bvec's that are not a multiple of a SECTOR_SIZE
- * due to possible offsets.
- */
- unsigned int dma_alignment;
- ANDROID_OEM_DATA(1);
- ANDROID_KABI_RESERVE(1);
- };
- typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
- void *data);
- void disk_set_zoned(struct gendisk *disk, enum blk_zoned_model model);
- #ifdef CONFIG_BLK_DEV_ZONED
- #define BLK_ALL_ZONES ((unsigned int)-1)
- int blkdev_report_zones(struct block_device *bdev, sector_t sector,
- unsigned int nr_zones, report_zones_cb cb, void *data);
- unsigned int bdev_nr_zones(struct block_device *bdev);
- extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_op op,
- sector_t sectors, sector_t nr_sectors,
- gfp_t gfp_mask);
- int blk_revalidate_disk_zones(struct gendisk *disk,
- void (*update_driver_data)(struct gendisk *disk));
- extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
- unsigned int cmd, unsigned long arg);
- extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
- unsigned int cmd, unsigned long arg);
- #else /* CONFIG_BLK_DEV_ZONED */
- static inline unsigned int bdev_nr_zones(struct block_device *bdev)
- {
- return 0;
- }
- static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
- fmode_t mode, unsigned int cmd,
- unsigned long arg)
- {
- return -ENOTTY;
- }
- static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
- fmode_t mode, unsigned int cmd,
- unsigned long arg)
- {
- return -ENOTTY;
- }
- #endif /* CONFIG_BLK_DEV_ZONED */
- /*
- * 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 kobject kobj;
- sector_t sector;
- sector_t nr_sectors;
- };
- struct blk_independent_access_ranges {
- struct kobject kobj;
- bool sysfs_registered;
- unsigned int nr_ia_ranges;
- struct blk_independent_access_range ia_range[];
- };
- struct request_queue {
- struct request *last_merge;
- struct elevator_queue *elevator;
- struct percpu_ref q_usage_counter;
- struct blk_queue_stats *stats;
- struct rq_qos *rq_qos;
- const struct blk_mq_ops *mq_ops;
- /* sw queues */
- struct blk_mq_ctx __percpu *queue_ctx;
- unsigned int queue_depth;
- /* hw dispatch queues */
- struct xarray hctx_table;
- unsigned int nr_hw_queues;
- /*
- * The queue owner gets to use this for whatever they like.
- * ll_rw_blk doesn't touch it.
- */
- void *queuedata;
- /*
- * various queue flags, see QUEUE_* below
- */
- unsigned long queue_flags;
- /*
- * Number of contexts that have called blk_set_pm_only(). If this
- * counter is above zero then only RQF_PM requests are processed.
- */
- atomic_t pm_only;
- /*
- * ida allocated id for this queue. Used to index queues from
- * ioctx.
- */
- int id;
- spinlock_t queue_lock;
- struct gendisk *disk;
- /*
- * queue kobject
- */
- struct kobject kobj;
- /*
- * mq queue kobject
- */
- struct kobject *mq_kobj;
- #ifdef CONFIG_BLK_DEV_INTEGRITY
- struct blk_integrity integrity;
- #endif /* CONFIG_BLK_DEV_INTEGRITY */
- #ifdef CONFIG_PM
- struct device *dev;
- enum rpm_status rpm_status;
- #endif
- /*
- * queue settings
- */
- unsigned long nr_requests; /* Max # of requests */
- unsigned int dma_pad_mask;
- #ifdef CONFIG_BLK_INLINE_ENCRYPTION
- struct blk_crypto_profile *crypto_profile;
- struct kobject *crypto_kobject;
- #endif
- unsigned int rq_timeout;
- int poll_nsec;
- struct blk_stat_callback *poll_cb;
- struct blk_rq_stat *poll_stat;
- struct timer_list timeout;
- struct work_struct timeout_work;
- atomic_t nr_active_requests_shared_tags;
- struct blk_mq_tags *sched_shared_tags;
- struct list_head icq_list;
- #ifdef CONFIG_BLK_CGROUP
- DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS);
- struct blkcg_gq *root_blkg;
- struct list_head blkg_list;
- #endif
- struct queue_limits limits;
- unsigned int required_elevator_features;
- int node;
- #ifdef CONFIG_BLK_DEV_IO_TRACE
- struct blk_trace __rcu *blk_trace;
- #endif
- /*
- * for flush operations
- */
- struct blk_flush_queue *fq;
- struct list_head requeue_list;
- spinlock_t requeue_lock;
- struct delayed_work requeue_work;
- struct mutex sysfs_lock;
- struct mutex sysfs_dir_lock;
- /*
- * for reusing dead hctx instance in case of updating
- * nr_hw_queues
- */
- struct list_head unused_hctx_list;
- spinlock_t unused_hctx_lock;
- int mq_freeze_depth;
- #ifdef CONFIG_BLK_DEV_THROTTLING
- /* Throttle data */
- struct throtl_data *td;
- #endif
- struct rcu_head rcu_head;
- wait_queue_head_t mq_freeze_wq;
- /*
- * Protect concurrent access to q_usage_counter by
- * percpu_ref_kill() and percpu_ref_reinit().
- */
- struct mutex mq_freeze_lock;
- int quiesce_depth;
- struct blk_mq_tag_set *tag_set;
- struct list_head tag_set_list;
- struct dentry *debugfs_dir;
- struct dentry *sched_debugfs_dir;
- struct dentry *rqos_debugfs_dir;
- /*
- * Serializes all debugfs metadata operations using the above dentries.
- */
- struct mutex debugfs_mutex;
- bool mq_sysfs_init_done;
- ANDROID_OEM_DATA(1);
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- ANDROID_KABI_RESERVE(3);
- ANDROID_KABI_RESERVE(4);
- /**
- * @srcu: Sleepable RCU. Use as lock when type of the request queue
- * is blocking (BLK_MQ_F_BLOCKING). Must be the last member
- */
- struct srcu_struct srcu[];
- };
- /* Keep blk_queue_flag_name[] in sync with the definitions below */
- #define QUEUE_FLAG_STOPPED 0 /* queue is stopped */
- #define QUEUE_FLAG_DYING 1 /* queue being torn down */
- #define QUEUE_FLAG_HAS_SRCU 2 /* SRCU is allocated */
- #define QUEUE_FLAG_NOMERGES 3 /* disable merge attempts */
- #define QUEUE_FLAG_SAME_COMP 4 /* complete on same CPU-group */
- #define QUEUE_FLAG_FAIL_IO 5 /* fake timeout */
- #define QUEUE_FLAG_NONROT 6 /* non-rotational device (SSD) */
- #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
- #define QUEUE_FLAG_IO_STAT 7 /* do disk/partitions IO accounting */
- #define QUEUE_FLAG_NOXMERGES 9 /* No extended merges */
- #define QUEUE_FLAG_ADD_RANDOM 10 /* Contributes to random pool */
- #define QUEUE_FLAG_SAME_FORCE 12 /* force complete on same CPU */
- #define QUEUE_FLAG_HW_WC 18 /* Write back caching supported */
- #define QUEUE_FLAG_INIT_DONE 14 /* queue is initialized */
- #define QUEUE_FLAG_STABLE_WRITES 15 /* don't modify blks until WB is done */
- #define QUEUE_FLAG_POLL 16 /* IO polling enabled if set */
- #define QUEUE_FLAG_WC 17 /* Write back caching */
- #define QUEUE_FLAG_FUA 18 /* device supports FUA writes */
- #define QUEUE_FLAG_DAX 19 /* device supports DAX */
- #define QUEUE_FLAG_STATS 20 /* track IO start and completion times */
- #define QUEUE_FLAG_REGISTERED 22 /* queue has been registered to a disk */
- #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */
- #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */
- #define QUEUE_FLAG_ZONE_RESETALL 26 /* supports Zone Reset All */
- #define QUEUE_FLAG_RQ_ALLOC_TIME 27 /* record rq->alloc_time_ns */
- #define QUEUE_FLAG_HCTX_ACTIVE 28 /* at least one blk-mq hctx is active */
- #define QUEUE_FLAG_NOWAIT 29 /* device supports NOWAIT */
- #define QUEUE_FLAG_SQ_SCHED 30 /* single queue style io dispatch */
- #define QUEUE_FLAG_MQ_DEFAULT ((1UL << QUEUE_FLAG_IO_STAT) | \
- (1UL << QUEUE_FLAG_SAME_COMP) | \
- (1UL << QUEUE_FLAG_NOWAIT))
- void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
- void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
- bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);
- #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
- #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
- #define blk_queue_has_srcu(q) test_bit(QUEUE_FLAG_HAS_SRCU, &(q)->queue_flags)
- #define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
- #define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
- #define blk_queue_noxmerges(q) \
- test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
- #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
- #define blk_queue_stable_writes(q) \
- test_bit(QUEUE_FLAG_STABLE_WRITES, &(q)->queue_flags)
- #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
- #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
- #define blk_queue_zone_resetall(q) \
- test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
- #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
- #define blk_queue_pci_p2pdma(q) \
- test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
- #ifdef CONFIG_BLK_RQ_ALLOC_TIME
- #define blk_queue_rq_alloc_time(q) \
- test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
- #else
- #define blk_queue_rq_alloc_time(q) false
- #endif
- #define blk_noretry_request(rq) \
- ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
- REQ_FAILFAST_DRIVER))
- #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
- #define blk_queue_pm_only(q) atomic_read(&(q)->pm_only)
- #define blk_queue_registered(q) test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
- #define blk_queue_sq_sched(q) test_bit(QUEUE_FLAG_SQ_SCHED, &(q)->queue_flags)
- 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) list_entry((ptr), struct request, queuelist)
- #define dma_map_bvec(dev, bv, dir, attrs) \
- dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
- (dir), (attrs))
- static inline bool queue_is_mq(struct request_queue *q)
- {
- return q->mq_ops;
- }
- #ifdef CONFIG_PM
- static inline enum rpm_status queue_rpm_status(struct request_queue *q)
- {
- return q->rpm_status;
- }
- #else
- static inline enum rpm_status queue_rpm_status(struct request_queue *q)
- {
- return RPM_ACTIVE;
- }
- #endif
- static inline enum blk_zoned_model
- blk_queue_zoned_model(struct request_queue *q)
- {
- if (IS_ENABLED(CONFIG_BLK_DEV_ZONED))
- return q->limits.zoned;
- return BLK_ZONED_NONE;
- }
- static inline bool blk_queue_is_zoned(struct request_queue *q)
- {
- switch (blk_queue_zoned_model(q)) {
- case BLK_ZONED_HA:
- case BLK_ZONED_HM:
- return true;
- default:
- return false;
- }
- }
- #ifdef CONFIG_BLK_DEV_ZONED
- static inline unsigned int disk_nr_zones(struct gendisk *disk)
- {
- return blk_queue_is_zoned(disk->queue) ? disk->nr_zones : 0;
- }
- static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
- {
- if (!blk_queue_is_zoned(disk->queue))
- return 0;
- return sector >> ilog2(disk->queue->limits.chunk_sectors);
- }
- static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
- {
- if (!blk_queue_is_zoned(disk->queue))
- return false;
- if (!disk->conv_zones_bitmap)
- return true;
- return !test_bit(disk_zone_no(disk, sector), disk->conv_zones_bitmap);
- }
- static inline void disk_set_max_open_zones(struct gendisk *disk,
- unsigned int max_open_zones)
- {
- disk->max_open_zones = max_open_zones;
- }
- static inline void disk_set_max_active_zones(struct gendisk *disk,
- unsigned int max_active_zones)
- {
- disk->max_active_zones = max_active_zones;
- }
- static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
- {
- return bdev->bd_disk->max_open_zones;
- }
- static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
- {
- return bdev->bd_disk->max_active_zones;
- }
- #else /* CONFIG_BLK_DEV_ZONED */
- static inline unsigned int disk_nr_zones(struct gendisk *disk)
- {
- return 0;
- }
- static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
- {
- return false;
- }
- static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
- {
- return 0;
- }
- static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
- {
- return 0;
- }
- static inline unsigned int bdev_max_active_zones(struct block_device *bdev)
- {
- return 0;
- }
- #endif /* CONFIG_BLK_DEV_ZONED */
- static inline unsigned int blk_queue_depth(struct request_queue *q)
- {
- if (q->queue_depth)
- return q->queue_depth;
- return q->nr_requests;
- }
- /*
- * default timeout for SG_IO if none specified
- */
- #define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
- #define BLK_MIN_SG_TIMEOUT (7 * HZ)
- /* This should not be used directly - use rq_for_each_segment */
- #define for_each_bio(_bio) \
- for (; _bio; _bio = _bio->bi_next)
- 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)
- {
- return device_add_disk(NULL, disk, NULL);
- }
- 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 int get_disk_ro(struct gendisk *disk)
- {
- return disk->part0->bd_read_only ||
- test_bit(GD_READ_ONLY, &disk->state);
- }
- static inline int bdev_read_only(struct block_device *bdev)
- {
- return bdev->bd_read_only || get_disk_ro(bdev->bd_disk);
- }
- bool set_capacity_and_notify(struct gendisk *disk, sector_t size);
- bool disk_force_media_change(struct gendisk *disk, unsigned int events);
- 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)
- {
- return bdev->bd_start_sect;
- }
- static inline sector_t bdev_nr_sectors(struct block_device *bdev)
- {
- return bdev->bd_nr_sectors;
- }
- static inline loff_t bdev_nr_bytes(struct block_device *bdev)
- {
- return (loff_t)bdev_nr_sectors(bdev) << SECTOR_SHIFT;
- }
- static inline sector_t get_capacity(struct gendisk *disk)
- {
- return bdev_nr_sectors(disk->part0);
- }
- static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
- {
- return bdev_nr_sectors(sb->s_bdev) >>
- (sb->s_blocksize_bits - SECTOR_SHIFT);
- }
- int bdev_disk_changed(struct gendisk *disk, bool invalidate);
- void put_disk(struct gendisk *disk);
- struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass);
- /**
- * blk_alloc_disk - allocate a gendisk structure
- * @node_id: numa node to allocate on
- *
- * Allocate and pre-initialize a gendisk structure for use with BIO based
- * drivers.
- *
- * Context: can sleep
- */
- #define blk_alloc_disk(node_id) \
- ({ \
- static struct lock_class_key __key; \
- \
- __blk_alloc_disk(node_id, &__key); \
- })
- int __register_blkdev(unsigned int major, const char *name,
- void (*probe)(dev_t devt));
- #define register_blkdev(major, name) \
- __register_blkdev(major, name, NULL)
- void unregister_blkdev(unsigned int major, const char *name);
- bool bdev_check_media_change(struct block_device *bdev);
- int __invalidate_device(struct block_device *bdev, bool kill_dirty);
- 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);
- int bd_register_pending_holders(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)
- {
- }
- static inline int bd_register_pending_holders(struct gendisk *disk)
- {
- return 0;
- }
- #endif /* CONFIG_BLOCK_HOLDER_DEPRECATED */
- dev_t part_devt(struct gendisk *disk, u8 partno);
- void inc_diskseq(struct gendisk *disk);
- dev_t blk_lookup_devt(const char *name, int partno);
- 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);
- /* only poll the hardware once, don't continue until a completion was found */
- #define BLK_POLL_ONESHOT (1 << 0)
- /* do not sleep to wait for the expected completion time */
- #define BLK_POLL_NOSLEEP (1 << 1)
- 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)
- {
- return bdev->bd_queue; /* this is never NULL */
- }
- /* 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)
- {
- return disk_zone_no(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
- }
- static inline unsigned int bio_zone_is_seq(struct bio *bio)
- {
- return disk_zone_is_seq(bio->bi_bdev->bd_disk, bio->bi_iter.bi_sector);
- }
- /*
- * Return how much of the chunk is left to be used for I/O at a given offset.
- */
- static inline unsigned int blk_chunk_sectors_left(sector_t offset,
- unsigned int chunk_sectors)
- {
- if (unlikely(!is_power_of_2(chunk_sectors)))
- return chunk_sectors - sector_div(offset, chunk_sectors);
- return chunk_sectors - (offset & (chunk_sectors - 1));
- }
- /*
- * Access functions for manipulating queue properties
- */
- void blk_queue_bounce_limit(struct request_queue *q, enum blk_bounce limit);
- extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
- extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
- extern void blk_queue_max_segments(struct request_queue *, unsigned short);
- extern void blk_queue_max_discard_segments(struct request_queue *,
- unsigned short);
- void blk_queue_max_secure_erase_sectors(struct request_queue *q,
- unsigned int max_sectors);
- extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
- extern void blk_queue_max_discard_sectors(struct request_queue *q,
- unsigned int max_discard_sectors);
- extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
- unsigned int max_write_same_sectors);
- extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
- extern void blk_queue_max_zone_append_sectors(struct request_queue *q,
- unsigned int max_zone_append_sectors);
- extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
- void blk_queue_zone_write_granularity(struct request_queue *q,
- unsigned int size);
- extern void blk_queue_alignment_offset(struct request_queue *q,
- unsigned int alignment);
- void disk_update_readahead(struct gendisk *disk);
- extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
- extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
- extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
- extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
- 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);
- extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
- sector_t offset);
- extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
- extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
- extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
- extern void blk_queue_dma_alignment(struct request_queue *, int);
- extern void blk_queue_update_dma_alignment(struct request_queue *, int);
- extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
- extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
- 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);
- /*
- * Elevator features for blk_queue_required_elevator_features:
- */
- /* Supports zoned block devices sequential write constraint */
- #define ELEVATOR_F_ZBD_SEQ_WRITE (1U << 0)
- extern void blk_queue_required_elevator_features(struct request_queue *q,
- unsigned int features);
- extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
- struct device *dev);
- 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 request *mq_list; /* blk-mq requests */
- /* if ios_left is > 1, we can batch tag/rq allocations */
- struct request *cached_rq;
- unsigned short nr_ios;
- unsigned short rq_count;
- bool multiple_queues;
- bool has_elevator;
- bool nowait;
- struct list_head cb_list; /* md requires an unplug callback */
- };
- struct blk_plug_cb;
- typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
- struct blk_plug_cb {
- struct list_head list;
- blk_plug_cb_fn callback;
- void *data;
- };
- 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)
- {
- if (plug)
- __blk_flush_plug(plug, async);
- }
- 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 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 (1 << 0) /* do not free blocks */
- #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */
- 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)
- {
- return blkdev_issue_discard(sb->s_bdev,
- block << (sb->s_blocksize_bits -
- SECTOR_SHIFT),
- nr_blocks << (sb->s_blocksize_bits -
- SECTOR_SHIFT),
- gfp_mask);
- }
- static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
- sector_t nr_blocks, gfp_t gfp_mask)
- {
- return blkdev_issue_zeroout(sb->s_bdev,
- block << (sb->s_blocksize_bits -
- SECTOR_SHIFT),
- nr_blocks << (sb->s_blocksize_bits -
- SECTOR_SHIFT),
- gfp_mask, 0);
- }
- static inline bool bdev_is_partition(struct block_device *bdev)
- {
- return bdev->bd_partno;
- }
- enum blk_default_limits {
- BLK_MAX_SEGMENTS = 128,
- BLK_SAFE_MAX_SECTORS = 255,
- BLK_DEF_MAX_SECTORS = 2560,
- BLK_MAX_SEGMENT_SIZE = 65536,
- BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
- };
- static inline unsigned long queue_segment_boundary(const struct request_queue *q)
- {
- return q->limits.seg_boundary_mask;
- }
- static inline unsigned long queue_virt_boundary(const struct request_queue *q)
- {
- return q->limits.virt_boundary_mask;
- }
- static inline unsigned int queue_max_sectors(const struct request_queue *q)
- {
- return q->limits.max_sectors;
- }
- static inline unsigned int queue_max_bytes(struct request_queue *q)
- {
- return min_t(unsigned int, queue_max_sectors(q), INT_MAX >> 9) << 9;
- }
- static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
- {
- return q->limits.max_hw_sectors;
- }
- static inline unsigned short queue_max_segments(const struct request_queue *q)
- {
- return q->limits.max_segments;
- }
- static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
- {
- return q->limits.max_discard_segments;
- }
- static inline unsigned int queue_max_segment_size(const struct request_queue *q)
- {
- return q->limits.max_segment_size;
- }
- static inline unsigned int queue_max_zone_append_sectors(const struct request_queue *q)
- {
- const struct queue_limits *l = &q->limits;
- return min(l->max_zone_append_sectors, l->max_sectors);
- }
- static inline unsigned int
- bdev_max_zone_append_sectors(struct block_device *bdev)
- {
- return queue_max_zone_append_sectors(bdev_get_queue(bdev));
- }
- static inline unsigned int bdev_max_segments(struct block_device *bdev)
- {
- return queue_max_segments(bdev_get_queue(bdev));
- }
- static inline unsigned queue_logical_block_size(const struct request_queue *q)
- {
- int retval = 512;
- if (q && q->limits.logical_block_size)
- retval = q->limits.logical_block_size;
- return retval;
- }
- static inline unsigned int bdev_logical_block_size(struct block_device *bdev)
- {
- return queue_logical_block_size(bdev_get_queue(bdev));
- }
- static inline unsigned int queue_physical_block_size(const struct request_queue *q)
- {
- return q->limits.physical_block_size;
- }
- static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
- {
- return queue_physical_block_size(bdev_get_queue(bdev));
- }
- static inline unsigned int queue_io_min(const struct request_queue *q)
- {
- return q->limits.io_min;
- }
- static inline int bdev_io_min(struct block_device *bdev)
- {
- return queue_io_min(bdev_get_queue(bdev));
- }
- static inline unsigned int queue_io_opt(const struct request_queue *q)
- {
- return q->limits.io_opt;
- }
- static inline int bdev_io_opt(struct block_device *bdev)
- {
- return queue_io_opt(bdev_get_queue(bdev));
- }
- static inline unsigned int
- queue_zone_write_granularity(const struct request_queue *q)
- {
- return q->limits.zone_write_granularity;
- }
- static inline unsigned int
- bdev_zone_write_granularity(struct block_device *bdev)
- {
- return queue_zone_write_granularity(bdev_get_queue(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)
- {
- return bdev_get_queue(bdev)->limits.max_discard_sectors;
- }
- static inline unsigned int bdev_discard_granularity(struct block_device *bdev)
- {
- return bdev_get_queue(bdev)->limits.discard_granularity;
- }
- static inline unsigned int
- bdev_max_secure_erase_sectors(struct block_device *bdev)
- {
- return bdev_get_queue(bdev)->limits.max_secure_erase_sectors;
- }
- static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
- {
- struct request_queue *q = bdev_get_queue(bdev);
- if (q)
- return q->limits.max_write_zeroes_sectors;
- return 0;
- }
- static inline bool bdev_nonrot(struct block_device *bdev)
- {
- return blk_queue_nonrot(bdev_get_queue(bdev));
- }
- static inline bool bdev_stable_writes(struct block_device *bdev)
- {
- return test_bit(QUEUE_FLAG_STABLE_WRITES,
- &bdev_get_queue(bdev)->queue_flags);
- }
- static inline bool bdev_write_cache(struct block_device *bdev)
- {
- return test_bit(QUEUE_FLAG_WC, &bdev_get_queue(bdev)->queue_flags);
- }
- static inline bool bdev_fua(struct block_device *bdev)
- {
- return test_bit(QUEUE_FLAG_FUA, &bdev_get_queue(bdev)->queue_flags);
- }
- static inline bool bdev_nowait(struct block_device *bdev)
- {
- return test_bit(QUEUE_FLAG_NOWAIT, &bdev_get_queue(bdev)->queue_flags);
- }
- static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
- {
- struct request_queue *q = bdev_get_queue(bdev);
- if (q)
- return blk_queue_zoned_model(q);
- return BLK_ZONED_NONE;
- }
- static inline bool bdev_is_zoned(struct block_device *bdev)
- {
- struct request_queue *q = bdev_get_queue(bdev);
- if (q)
- return blk_queue_is_zoned(q);
- return false;
- }
- static inline bool bdev_op_is_zoned_write(struct block_device *bdev,
- enum req_op op)
- {
- if (!bdev_is_zoned(bdev))
- return false;
- return op == REQ_OP_WRITE || op == REQ_OP_WRITE_ZEROES;
- }
- static inline sector_t bdev_zone_sectors(struct block_device *bdev)
- {
- struct request_queue *q = bdev_get_queue(bdev);
- if (!blk_queue_is_zoned(q))
- return 0;
- return q->limits.chunk_sectors;
- }
- static inline int queue_dma_alignment(const struct request_queue *q)
- {
- return q ? q->limits.dma_alignment : 511;
- }
- static inline unsigned int bdev_dma_alignment(struct block_device *bdev)
- {
- return queue_dma_alignment(bdev_get_queue(bdev));
- }
- static inline bool bdev_iter_is_aligned(struct block_device *bdev,
- struct iov_iter *iter)
- {
- return iov_iter_is_aligned(iter, bdev_dma_alignment(bdev),
- bdev_logical_block_size(bdev) - 1);
- }
- static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
- unsigned int len)
- {
- unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
- return !(addr & alignment) && !(len & alignment);
- }
- /* assumes size > 256 */
- static inline unsigned int blksize_bits(unsigned int size)
- {
- unsigned int bits = 8;
- do {
- bits++;
- size >>= 1;
- } while (size > 256);
- return bits;
- }
- static inline unsigned int block_size(struct block_device *bdev)
- {
- return 1 << bdev->bd_inode->i_blkbits;
- }
- 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) \
- MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
- #define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
- MODULE_ALIAS("block-major-" __stringify(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 {
- /* these match the Designator Types specified in SPC */
- BLK_UID_T10 = 1,
- BLK_UID_EUI64 = 2,
- BLK_UID_NAA = 3,
- };
- #define NFL4_UFLG_MASK 0x0000003F
- struct block_device_operations {
- void (*submit_bio)(struct bio *bio);
- int (*poll_bio)(struct bio *bio, struct io_comp_batch *iob,
- unsigned int flags);
- int (*open) (struct block_device *, fmode_t);
- void (*release) (struct gendisk *, fmode_t);
- int (*rw_page)(struct block_device *, sector_t, struct page *, enum req_op);
- int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
- int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
- unsigned int (*check_events) (struct gendisk *disk,
- unsigned int clearing);
- void (*unlock_native_capacity) (struct gendisk *);
- int (*getgeo)(struct block_device *, struct hd_geometry *);
- int (*set_read_only)(struct block_device *bdev, bool ro);
- void (*free_disk)(struct gendisk *disk);
- /* this callback is with swap_lock and sometimes page table lock held */
- void (*swap_slot_free_notify) (struct block_device *, unsigned long);
- int (*report_zones)(struct gendisk *, sector_t sector,
- unsigned int nr_zones, report_zones_cb cb, void *data);
- char *(*devnode)(struct gendisk *disk, umode_t *mode);
- /* returns the length of the identifier or a negative errno: */
- int (*get_unique_id)(struct gendisk *disk, u8 id[16],
- enum blk_unique_id id_type);
- struct module *owner;
- const struct pr_ops *pr_ops;
- /*
- * Special callback for probing GPT entry at a given sector.
- * Needed by Android devices, used by GPT scanner and MMC blk
- * driver.
- */
- int (*alternative_gpt_sector)(struct gendisk *disk, sector_t *sector);
- ANDROID_KABI_RESERVE(1);
- ANDROID_KABI_RESERVE(2);
- };
- #ifdef CONFIG_COMPAT
- extern int blkdev_compat_ptr_ioctl(struct block_device *, fmode_t,
- unsigned int, unsigned long);
- #else
- #define blkdev_compat_ptr_ioctl NULL
- #endif
- extern int bdev_read_page(struct block_device *, sector_t, struct page *);
- extern int bdev_write_page(struct block_device *, sector_t, struct page *,
- struct writeback_control *);
- static inline void blk_wake_io_task(struct task_struct *waiter)
- {
- /*
- * If we're polling, the task itself is doing the completions. For
- * that case, we don't need to signal a wakeup, it's enough to just
- * mark us as RUNNING.
- */
- if (waiter == current)
- __set_current_state(TASK_RUNNING);
- else
- wake_up_process(waiter);
- }
- unsigned long bdev_start_io_acct(struct block_device *bdev,
- unsigned int sectors, enum req_op op,
- unsigned long start_time);
- void bdev_end_io_acct(struct block_device *bdev, enum req_op op,
- unsigned long start_time);
- void bio_start_io_acct_time(struct bio *bio, 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)
- {
- return bio_end_io_acct_remapped(bio, start_time, bio->bi_bdev);
- }
- int bdev_read_only(struct block_device *bdev);
- int set_blocksize(struct block_device *bdev, int size);
- int lookup_bdev(const char *pathname, dev_t *dev);
- void blkdev_show(struct seq_file *seqf, off_t offset);
- #define BDEVNAME_SIZE 32 /* Largest string for a blockdev identifier */
- #define BDEVT_SIZE 10 /* Largest string for MAJ:MIN for blkdev */
- #ifdef CONFIG_BLOCK
- #define BLKDEV_MAJOR_MAX 512
- #else
- #define BLKDEV_MAJOR_MAX 0
- #endif
- struct block_device *blkdev_get_by_path(const char *path, fmode_t mode,
- void *holder);
- struct block_device *blkdev_get_by_dev(dev_t dev, fmode_t mode, void *holder);
- int bd_prepare_to_claim(struct block_device *bdev, void *holder);
- void bd_abort_claiming(struct block_device *bdev, void *holder);
- void blkdev_put(struct block_device *bdev, fmode_t mode);
- /* 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 *bdev_alloc(struct gendisk *disk, u8 partno);
- void bdev_add(struct block_device *bdev, dev_t dev);
- struct block_device *I_BDEV(struct inode *inode);
- int truncate_bdev_range(struct block_device *bdev, fmode_t mode, loff_t lstart,
- loff_t lend);
- #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_dioalign(struct inode *inode, struct kstat *stat);
- void printk_all_partitions(void);
- #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_dioalign(struct inode *inode, struct kstat *stat)
- {
- }
- static inline void printk_all_partitions(void)
- {
- }
- #endif /* CONFIG_BLOCK */
- int fsync_bdev(struct block_device *bdev);
- int freeze_bdev(struct block_device *bdev);
- int thaw_bdev(struct block_device *bdev);
- struct io_comp_batch {
- struct request *req_list;
- bool need_ts;
- void (*complete)(struct io_comp_batch *);
- };
- #define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }
- #endif /* _LINUX_BLKDEV_H */
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