linux-kernel - Re: [patch 4/8] fs, exportfs: Add export_encode_inode

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Message-ID: <20120820194038.GA10402@moon>
Date:	Mon, 20 Aug 2012 23:40:38 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>
Subject: Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

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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