Date: Mon, 20 Aug 2012 23:40:38 +0400
From: Cyrill Gorcunov <gorcunov@openvz.org>
To: "J. Bruce Fields" <bfields@fieldses.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Al Viro <viro@zeniv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Pavel Emelyanov <xemul@parallels.com>,
        James Bottomley <jbottomley@parallels.com>,
        Matthew Helsley <matt.helsley@gmail.com>
Subject: Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper
Message-ID: <20120820194038.GA10402@moon>
References: <20120815092116.700948346@openvz.org>
 <20120815092409.591460800@openvz.org>
 <87fw7habo4.fsf@skywalker.in.ibm.com>
 <20120820163338.GN23596@moon>
 <20120820183225.GB4911@fieldses.org>
 <20120820190606.GE27443@moon>
 <20120820193204.GD5779@fieldses.org>
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On Mon, Aug 20, 2012 at 03:32:04PM -0400, J. Bruce Fields wrote:
> > > > Hi, sorry for dealy. Well, the last idea is to get rid of this helper,
> > > > I've sent out an updated version where ino+dev is only printed.
> > > 
> > > I don't understand how ino and dev are useful to you, though, if you're
> > > still hoping to be able to look up inodes using this information later
> > > on.
> > 
> > Hi Bruce, I believe having ino+dev is better than nothing. Otherwise we
> > simply have no clue which targets are bound to inotify mark. Sometime
> > (!) we can try to generate fhandle in userspace from this ino+dev bundle
> > and then open the target file.
> 
> That's insufficient to generate a filehandle in general.

That's why I said `sometime', and this is better than nothing.

> (Also: there's the usual inode-number aliasing problem: the inode number
> could get reused by another file.  Unless you know the file is being
> held open the whole time.)

For c/r session inode should exist and not get reused.

	Cyrill
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