Date: Wed, 14 Nov 2012 08:26:22 -0500
From: "J. Bruce Fields" <bfields@fieldses.org>
To: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Pavel Emelyanov <xemul@parallels.com>,
        Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk>,
        David Rientjes <rientjes@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        Al Viro <viro@zeniv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@gmail.com>,
        James Bottomley <jbottomley@parallels.com>,
        Matthew Helsley <matt.helsley@gmail.com>,
        aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [patch 3/7] fs, notify: Add file handle entry into
 inotify_inode_mark
Message-ID: <20121114132622.GC23604@fieldses.org>
References: <20121112101440.665694060@openvz.org>
 <2105540.yeyMVrW4mH@deuteros>
 <50A36ED5.4080505@parallels.com>
 <2092535.8S9EcgmZCZ@deuteros>
 <50A37692.1010500@parallels.com>
 <20121114124549.GB23604@fieldses.org>
 <20121114130347.GJ16685@moon>
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On Wed, Nov 14, 2012 at 05:03:47PM +0400, Cyrill Gorcunov wrote:
> On Wed, Nov 14, 2012 at 07:45:49AM -0500, J. Bruce Fields wrote:
> > > 
> > > We can try going this route, what do you think?
> > 
> > I still don't understand why you need a dentry to get the filehandle.
> > The current api may ask for one, but it shouldn't really be necessary
> > (assuming you don't want parent directory information encoded in the
> > filehandle, which I hope you don't).
> 
> As far as I know we don't need parent encoded. So Bruce, you think
> to modify exportfs instead to work with inode directly?

Looks like the filesystem encode_fh method just takes inodes (with the
parent inode allowed to be NULL), so all you'd need would be a version
of exportfs_encode_fh that took an inode.

(Worst case, if that didn't work, you could fake up a dentry with
something like d_obtain_alias, but better not to if it's not necessary.)

--b.
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