return warn("fstatfs: $!\n");
my $f_type = unpack('l!', $buf); # statfs.f_type is a signed word
return if $f_type != 0x9123683E; # BTRFS_SUPER_MAGIC
return warn("fstatfs: $!\n");
my $f_type = unpack('l!', $buf); # statfs.f_type is a signed word
return if $f_type != 0x9123683E; # BTRFS_SUPER_MAGIC