linux-kernel - Re: [PATCH v12 11/12] open: openat2(2) syscall

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Date:   Tue, 10 Sep 2019 08:35:32 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Jeff Layton <jlayton@...nel.org>,
        Aleksa Sarai <cyphar@...har.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Christian Brauner <christian@...uner.io>,
        Eric Biederman <ebiederm@...ssion.com>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Jann Horn <jannh@...gle.com>, Tycho Andersen <tycho@...ho.ws>,
        David Drysdale <drysdale@...gle.com>,
        Chanho Min <chanho.min@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Aleksa Sarai <asarai@...e.de>,
        Linux Containers <containers@...ts.linux-foundation.org>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        linux-ia64@...r.kernel.org,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        linux-xtensa@...ux-xtensa.org, sparclinux@...r.kernel.org
Subject: Re: [PATCH v12 11/12] open: openat2(2) syscall


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Sat, Sep 7, 2019 at 10:42 AM Andy Lutomirski <luto@...capital.net> wrote:
> >
> > Linus, you rejected resolveat() because you wanted a *nice* API
> 
> No. I rejected resoveat() because it was a completely broken garbage
> API that couldn't do even basic stuff right (like O_CREAT).
> 
> We have a ton of flag space in the new openat2() model, we might as
> well leave the old flags alone that people are (a) used to and (b) we
> have code to support _anyway_.
> 
> Making up a new flag namespace is only going to cause us - and users -
> more work, and more confusion. For no actual advantage. It's not going
> to be "cleaner". It's just going to be worse.

I suspect there is a "add a clean new flags namespace" analogy to the 
classic "add a clean new standard" XKCD:

	https://xkcd.com/927/

Thanks,

	Ingo