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

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Date:	Wed, 14 Nov 2012 13:58:12 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Tvrtko Ursulin <tvrtko.ursulin@...lan.co.uk>
Cc:	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>,
	Pavel Emelyanov <xemul@...allels.com>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>,
	aneesh.kumar@...ux.vnet.ibm.com, bfields@...ldses.org
Subject: Re: [patch 3/7] fs, notify: Add file handle entry into
 inotify_inode_mark

On Wed, Nov 14, 2012 at 09:50:55AM +0000, Tvrtko Ursulin wrote:
> > > You could not use a pointer and then allocate your buffers on the check
> > > point operation, freeing on restore?
> > 
> > The problem is not allocating the memory itself but rather the time when the
> > information needed (ie the dentry) is available. The only moment when we
> > can use dentry of the target file/directory is at inotify_new_watch, that's
> > why i need to compose fhandle that early. At any later point we simply have
> > no dentry to use.
> 
> But you do not fundamentally need the dentry to restore a watch, right? 

dentry only needed to encode the file handle.

> Couldn't you restore, creating a new restore path if needed, using the inode 
> which is pinned anyway while the watch exists?

plain inode is not enough as far as i can tell, iow i don't see the way
to restore path from inode solely. or there something i miss?

	Cyrill
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