linux-kernel - Re: [PATCH 01/14] VFS: Add additional RESOLVE

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Message-ID: <20200313164857.GA17682@jeremy-acer>
Date:   Fri, 13 Mar 2020 09:48:57 -0700
From:   Jeremy Allison <jra@...ba.org>
To:     Aleksa Sarai <cyphar@...har.com>
Cc:     Stefan Metzmacher <metze@...ba.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>, Ian Kent <raven@...maw.net>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Christian Brauner <christian@...uner.io>,
        Jann Horn <jannh@...gle.com>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Karel Zak <kzak@...hat.com>, jlayton@...hat.com,
        Linux API <linux-api@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        LSM List <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Ralph Böhme <slow@...ba.org>,
        Volker Lendecke <vl@...net.de>
Subject: Re: [PATCH 01/14] VFS: Add additional RESOLVE_* flags [ver #18]

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.