linux-kernel - Re: new ...at() flag: AT_NO

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Message-ID: <CALCETrX0dx3d6OQQ+1GJ_xgSz3iNVeRn+8o6b-+3f7awVOWdQg@mail.gmail.com>
Date:   Sun, 30 Apr 2017 21:52:37 -0700
From:   Andy Lutomirski <luto@...nel.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Linux API <linux-api@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>
Subject: Re: new ...at() flag: AT_NO_JUMPS

On Sun, Apr 30, 2017 at 9:10 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
> On Sat, Apr 29, 2017 at 09:38:22PM -0700, Matthew Wilcox wrote:
>
>> It sounds more like AT_NO_ESCAPE ... or AT_BELOW, or something.
>
> I considered AT_ROACH_MOTEL at one point...  Another interesting
> question is whether EXDEV would've been better than ELOOP.
> Opinions?

In support of my homeland, I propose AT_HOTEL_CALIFORNIA.

How about EXDEV for crossing a mountpoint and ELOOP for absolute
symlinks or invalid ..?  (Is there a technical reason why the same AT_
flag should trigger both cases?)

--Andy