/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * Copyright (c) 2020-2024 Oracle.  All Rights Reserved.
 * Author: Darrick J. Wong <djwong@kernel.org>
 */
#ifndef __XFS_EXCHRANGE_H__
#define __XFS_EXCHRANGE_H__

/* Update the mtime/cmtime of file1 and file2 */
#define __XFS_EXCHANGE_RANGE_UPD_CMTIME1        (1ULL << 63)
#define __XFS_EXCHANGE_RANGE_UPD_CMTIME2        (1ULL << 62)

/* Freshness check required */
#define __XFS_EXCHANGE_RANGE_CHECK_FRESH2       (1ULL << 61)

#define XFS_EXCHANGE_RANGE_PRIV_FLAGS   (__XFS_EXCHANGE_RANGE_UPD_CMTIME1 | \
                                         __XFS_EXCHANGE_RANGE_UPD_CMTIME2 | \
                                         __XFS_EXCHANGE_RANGE_CHECK_FRESH2)

struct xfs_exchrange {
        struct file             *file1;
        struct file             *file2;

        loff_t                  file1_offset;
        loff_t                  file2_offset;
        u64                     length;

        u64                     flags;  /* XFS_EXCHANGE_RANGE flags */

        /* file2 metadata for freshness checks */
        u64                     file2_ino;
        struct timespec64       file2_mtime;
        struct timespec64       file2_ctime;
        u32                     file2_gen;
};

long xfs_ioc_exchange_range(struct file *file,
                struct xfs_exchange_range __user *argp);
long xfs_ioc_start_commit(struct file *file,
                struct xfs_commit_range __user *argp);
long xfs_ioc_commit_range(struct file *file,
                struct xfs_commit_range __user  *argp);

struct xfs_exchmaps_req;

void xfs_exchrange_ilock(struct xfs_trans *tp, struct xfs_inode *ip1,
                struct xfs_inode *ip2);
void xfs_exchrange_iunlock(struct xfs_inode *ip1, struct xfs_inode *ip2);

int xfs_exchrange_estimate(struct xfs_exchmaps_req *req);

#endif /* __XFS_EXCHRANGE_H__ */