linux-kernel - Re: [RFC 0/3] fs,epoll: Add ability to call kcmp to find target files

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Message-ID: <20170221205434.GD27653@uranus>
Date:   Tue, 21 Feb 2017 23:54:34 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Jason Baron <jbaron@...mai.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, viro@...iv.linux.org.uk,
        akpm@...uxfoundation.org, avagin@...tuozzo.com,
        xemul@...tuozzo.com, mtk.manpages@...il.com, kir@...nvz.org,
        luto@...capital.net
Subject: Re: [RFC 0/3] fs,epoll: Add ability to call kcmp to find target files

On Tue, Feb 21, 2017 at 03:32:21PM -0500, Jason Baron wrote:
> Hi,
> 
> Since an epoll fd can be added to another epoll fd, I'm wondering if you
> have enough data here to figure that out. The inode is the
> 'anon_inode_inode', so I'm wondering if that is sufficient to distinguish it
> from other anonymous inodes, or if an extra bit is required to indicate if
> the target file is in fact and epoll fd.

I think it should be ebough (together with sdev and pos). But will
look more closely tomorrow once I sit implementing criu support :)
(that's why it is early rfc, to gather comments)