mainly to get control over new features. E.g., ext2fs filesystems
may now have a type field in directory entries (like ufs has had for
20 years or so). Current versions of FreeBSD ext2fs panic on this.
ext2fs filesystem code is supposed to check the feature flags in the
superblock and take appropriate actions for unsupported features.
The other new features are sparse superblocks, large file support,
and btree'd directories.
files seem to be based on. Don't bother importing <asm-i386/string.h>
just to get the Linux implementation of memscan() which is appended
to our i386-bitops.h. The BSD skpc() should have been used instead
of memscan().
Obtained from: Linux 1.2.2 distribution
