linux-kernel - Re: [patch 3/7] fs, notify: Add file handle entry into inotify_inode

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Message-ID: <20121114132622.GC23604@fieldses.org>
Date:	Wed, 14 Nov 2012 08:26:22 -0500
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Cyrill Gorcunov <gorcunov@...nvz.org>
Cc:	Pavel Emelyanov <xemul@...allels.com>,
	Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>,
	Alexey Dobriyan <adobriyan@...il.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [patch 3/7] fs, notify: Add file handle entry into
 inotify_inode_mark

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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