% man statfs
...
Solaris and POSIX 1003.1-2001 have a system call statvfs
that returns a struct statvfs (defined in <sys/statvfs.h>)
containing an unsigned long f_fsid. Linux, SunOS, HPUX,
4.4BSD have a system call statfs that returns a struct
statfs (defined in <sys/vfs.h>) containing a fsid_t
f_fsid, where fsid_t is defined as struct { int val[2]; }.
The same holds for FreeBSD, except that it uses the
include file <sys/mount.h>.
...
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