A while ago, we fixed a problem in statfs on 64bit system that caused it
to return EOVERFLOW when the number of files reported by the underlying
file system was -1 (which happens for NFS for instance). The problematic
code was this:

        if (sizeof ubuf->f_blocks == 4) {
                if ((kbuf->f_blocks | kbuf->f_bfree |
                     kbuf->f_bavail | kbuf->f_files | kbuf->f_ffree) &
                    0xffffffff00000000ULL)
                        return -EOVERFLOW;
		...
	}

The problem was fixed by explicitly allowing f_files and f_ffree to be -1.

The same problem exists in fs/compat.c, and the attached patch fixes it
in a similar manner.
Signed-Off-By: Olaf Kirch <okir@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>