[PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]

[Jeremy Allison]

On Fri, Mar 13, 2020 at 08:59:01PM +1100, Aleksa Sarai wrote:
> 
> I have heard some folks asking for a way to create a directory and get a
> handle to it atomically -- so arguably this is something that could be
> inside openat2()'s feature set (O_MKDIR?). But I'm not sure how popular
> of an idea this is.

This would be very useful to prevent race conditions between making
a directory and EA's on it, as are needed by Samba for
DOS attributes and Windows/NFSv4 ACLS.