-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Al Viro wrote: > How about "the first entry returned by getdents(3) after open() is a whiteout > for e.g. '.'"? No fstat needed, zero impact for normal directories, > zero impact for any binaries on old kernels (where you wouldn't have > unions) and zero impact for old binaries on new kernels unless they > do getdents() on directory that happens to be a union. Your definition of "zero impact" doesn't quite match mine. This would require significant changes. > And no lockstep... Of course there is lockstep. It is not under the application's control whether a directory is a union fs or not. Every implementation except a pure kernel implementation has this problem. >> - - How does this work with NFS? > > It won't, kernel-side or done in userland. Why wouldn't a kernel-side implementation work? > Actually, do we really need it other than to 0 and to current position > (i.e. full rewind and a no-op)? Ever heard of the little function "telldir"? - -- ➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.8 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iEYEARECAAYFAkfaJXwACgkQ2ijCOnn/RHSRpQCZAXNktqSs6WRvxIlTlzUd6GC5 PrAAnRecjUcM6ZHoclzXrFFCsBWuIgid =8pZl -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
