Re: [RFC PATCH] fs: introduce mkdirat2 syscall for atomic mkdir

On Sun, Feb 28, 2021 at 02:58:22AM +0000, Al Viro wrote:

TBH, I don't understand what are you trying to achieve -
what will that mkdir+open combination buy you, especially
since that atomicity goes straight out of window if you try
to use that on e.g. NFS.  How is the userland supposed to make
use of that thing?

For what it's worth, the RPC that creates a directory can also get a
filehandle of the new directory, so I don't think there's anything in
the NFS protocol that would *prevent* implementing this.  (Whether
that's useful, I don't know.)

--b.