diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index e7ae08d1df485105a10f89cd8e976a826e63af53..123b20c8cbf23ddd54e697d0f3a0d058e126f44b 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1258,8 +1258,10 @@ xfs_file_last_byte(
 	 * necessary.
 	 */
 	if (ip->i_df.if_flags & XFS_IFEXTENTS) {
+		xfs_ilock(ip, XFS_ILOCK_SHARED);
 		error = xfs_bmap_last_offset(NULL, ip, &last_block,
 			XFS_DATA_FORK);
+		xfs_iunlock(ip, XFS_ILOCK_SHARED);
 		if (error) {
 			last_block = 0;
 		}