When a partition is not aligned by 4KB, mount -o dax succeeds, but any read/write access to the filesystem fails, except for metadata update.
Add alignment check to xfs_fs_fill_super() when -o dax is specified. Signed-off-by: Toshi Kani <[email protected]> Cc: Dave Chinner <[email protected]> (supporter:XFS FILESYSTEM) Cc: Dan Williams <[email protected]> Cc: Ross Zwisler <[email protected]> --- fs/xfs/xfs_super.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c index 187e14b..a17aebc 100644 --- a/fs/xfs/xfs_super.c +++ b/fs/xfs/xfs_super.c @@ -1563,6 +1563,11 @@ xfs_fs_fill_super( xfs_alert(mp, "Filesystem block size invalid for DAX Turning DAX off."); mp->m_flags &= ~XFS_MOUNT_DAX; + } else if (sb->s_bdev->bd_part->start_sect % (PAGE_SIZE / 512) + || sb->s_bdev->bd_part->nr_sects % (PAGE_SIZE / 512)) { + xfs_alert(mp, + "Partition alignment invalid for DAX Turning DAX off."); + mp->m_flags &= ~XFS_MOUNT_DAX; } else if (!sb->s_bdev->bd_disk->fops->direct_access) { xfs_alert(mp, "Block device does not support DAX Turning DAX off.");
