...mission to create a hard link to this file (see the description of /proc/sys/fs/protected_hardlinks in proc (5)). EPERM oldpath is marked immutable or append-only. (See FS_IOC_S…...mission to create a hard link to this file (see the description of /proc/sys/fs/protected_hardlinks in proc (5)). EPERM oldpath is marked immutable or append-only. (See FS_IOC_S…