кстати, а что это за ФС в мане она не описана
-t vfstype
The argument following the -t is used to indicate the file sys‐
tem type. The file system types which are currently supported
include: adfs, affs, autofs, coda, coherent, cramfs, devpts,
efs, ext, ext2, ext3, hfs, hpfs, iso9660, jfs, minix, msdos,
ncpfs, nfs, nfs4, ntfs, proc, qnx4, ramfs, reiserfs, romfs,
smbfs, sysv, tmpfs, udf, ufs, umsdos, usbfs, vfat, xenix, xfs,
xiafs. Note that coherent, sysv and xenix are equivalent and
that xenix and coherent will be removed at some point in the
future — use sysv instead. Since kernel version 2.1.21 the types
ext and xiafs do not exist anymore. Earlier, usbfs was known as
usbdevfs.