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xfs: don't allow DAX on reflink filesystems 

Now that reflink is no longer experimental, reject attempts to mount
with DAX until that whole mess gets sorted out.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-01-31 14:21:56 -08:00
parent 494370ccaa
commit b6e03c10bf
1 changed files with 4 additions and 1 deletions
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5
fs/xfs/xfs_super.c
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@ -1666,9 +1666,12 @@ xfs_fs_fill_super(
"DAX unsupported by block device. Turning off DAX.");
mp->m_flags &= ~XFS_MOUNT_DAX;
}
if (xfs_sb_version_hasreflink(&mp->m_sb))
if (xfs_sb_version_hasreflink(&mp->m_sb)) {
xfs_alert(mp,
"DAX and reflink cannot be used together!");
error = -EINVAL;
goto out_filestream_unmount;
}
}
if (mp->m_flags & XFS_MOUNT_DISCARD) {