xref: /linux/include/uapi/linux/ext4.h (revision 1ac731c529cd4d6adbce134754b51ff7d822b145)

/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

#ifndef _UAPI_LINUX_EXT4_H
#define _UAPI_LINUX_EXT4_H
#include <linux/fiemap.h>
#include <linux/fs.h>
#include <linux/ioctl.h>
#include <linux/types.h>

/*
 * ext4-specific ioctl commands
 */
#define	EXT4_IOC_GETVERSION		_IOR('f', 3, long)
#define	EXT4_IOC_SETVERSION		_IOW('f', 4, long)
#define	EXT4_IOC_GETVERSION_OLD		FS_IOC_GETVERSION
#define	EXT4_IOC_SETVERSION_OLD		FS_IOC_SETVERSION
#define EXT4_IOC_GETRSVSZ		_IOR('f', 5, long)
#define EXT4_IOC_SETRSVSZ		_IOW('f', 6, long)
#define EXT4_IOC_GROUP_EXTEND		_IOW('f', 7, unsigned long)
#define EXT4_IOC_GROUP_ADD		_IOW('f', 8, struct ext4_new_group_input)
#define EXT4_IOC_MIGRATE		_IO('f', 9)
 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
#define EXT4_IOC_ALLOC_DA_BLKS		_IO('f', 12)
#define EXT4_IOC_MOVE_EXT		_IOWR('f', 15, struct move_extent)
#define EXT4_IOC_RESIZE_FS		_IOW('f', 16, __u64)
#define EXT4_IOC_SWAP_BOOT		_IO('f', 17)
#define EXT4_IOC_PRECACHE_EXTENTS	_IO('f', 18)
/* ioctl codes 19--39 are reserved for fscrypt */
#define EXT4_IOC_CLEAR_ES_CACHE		_IO('f', 40)
#define EXT4_IOC_GETSTATE		_IOW('f', 41, __u32)
#define EXT4_IOC_GET_ES_CACHE		_IOWR('f', 42, struct fiemap)
#define EXT4_IOC_CHECKPOINT		_IOW('f', 43, __u32)
#define EXT4_IOC_GETFSUUID		_IOR('f', 44, struct fsuuid)
#define EXT4_IOC_SETFSUUID		_IOW('f', 44, struct fsuuid)

#define EXT4_IOC_SHUTDOWN _IOR('X', 125, __u32)

/*
 * ioctl commands in 32 bit emulation
 */
#define EXT4_IOC32_GETVERSION		_IOR('f', 3, int)
#define EXT4_IOC32_SETVERSION		_IOW('f', 4, int)
#define EXT4_IOC32_GETRSVSZ		_IOR('f', 5, int)
#define EXT4_IOC32_SETRSVSZ		_IOW('f', 6, int)
#define EXT4_IOC32_GROUP_EXTEND		_IOW('f', 7, unsigned int)
#define EXT4_IOC32_GROUP_ADD		_IOW('f', 8, struct compat_ext4_new_group_input)
#define EXT4_IOC32_GETVERSION_OLD	FS_IOC32_GETVERSION
#define EXT4_IOC32_SETVERSION_OLD	FS_IOC32_SETVERSION

/*
 * Flags returned by EXT4_IOC_GETSTATE
 *
 * We only expose to userspace a subset of the state flags in
 * i_state_flags
 */
#define EXT4_STATE_FLAG_EXT_PRECACHED	0x00000001
#define EXT4_STATE_FLAG_NEW		0x00000002
#define EXT4_STATE_FLAG_NEWENTRY	0x00000004
#define EXT4_STATE_FLAG_DA_ALLOC_CLOSE	0x00000008

/*
 * Flags for ioctl EXT4_IOC_CHECKPOINT
 */
#define EXT4_IOC_CHECKPOINT_FLAG_DISCARD	0x1
#define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT	0x2
#define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN	0x4
#define EXT4_IOC_CHECKPOINT_FLAG_VALID		(EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
						EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
						EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)

/*
 * Structure for EXT4_IOC_GETFSUUID/EXT4_IOC_SETFSUUID
 */
struct fsuuid {
	__u32       fsu_len;
	__u32       fsu_flags;
	__u8        fsu_uuid[];
};

/*
 * Structure for EXT4_IOC_MOVE_EXT
 */
struct move_extent {
	__u32 reserved;		/* should be zero */
	__u32 donor_fd;		/* donor file descriptor */
	__u64 orig_start;	/* logical start offset in block for orig */
	__u64 donor_start;	/* logical start offset in block for donor */
	__u64 len;		/* block length to be moved */
	__u64 moved_len;	/* moved block length */
};

/*
 * Flags used by EXT4_IOC_SHUTDOWN
 */
#define EXT4_GOING_FLAGS_DEFAULT		0x0	/* going down */
#define EXT4_GOING_FLAGS_LOGFLUSH		0x1	/* flush log but not data */
#define EXT4_GOING_FLAGS_NOLOGFLUSH		0x2	/* don't flush log nor data */

/* Used to pass group descriptor data when online resize is done */
struct ext4_new_group_input {
	__u32 group;		/* Group number for this data */
	__u64 block_bitmap;	/* Absolute block number of block bitmap */
	__u64 inode_bitmap;	/* Absolute block number of inode bitmap */
	__u64 inode_table;	/* Absolute block number of inode table start */
	__u32 blocks_count;	/* Total number of blocks in this group */
	__u16 reserved_blocks;	/* Number of reserved blocks in this group */
	__u16 unused;
};

/*
 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
 * It indicates that the entry in extent status cache is for a hole.
 */
#define EXT4_FIEMAP_EXTENT_HOLE		0x08000000

#endif /* _UAPI_LINUX_EXT4_H */