/* 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 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
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