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

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Message-ID: <20120816141553.GF1209@moon>
Date:	Thu, 16 Aug 2012 18:15:53 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	James Bottomley <jbottomley@...allels.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Pavel Emelianov <xemul@...allels.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Helsley <matt.helsley@...il.com>
Subject: Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

On Thu, Aug 16, 2012 at 02:03:00PM +0000, James Bottomley wrote:
> > > What's wrong with saying "we don't support idiotify"?
> > 
> > Al, we need some way to restore inotifies after checkpoint.
> > At the very early versions of these patches I simply added
> > dentry to the inotify mark thus once inotify created we always
> > have a dentry to refer on in encode_fh, but I'm not sure if
> > this will be good design.
> 
> Actually, I was about to suggest this.  This can be done internally
> within fs/notify without actually modifying the syscall interface, can't
> it, since they take a path which is used to obtain the inode?  It looks
> like the whole of the inotify interface could be internally recast to
> use dentries instead of inodes.  Unless I've missed something obvious?

Well, after looking into do_sys_name_to_handle->exportfs_encode_fh
sequence more precisely it seems it will be easier to extend
exportfs_encode_fh to support inodes directly instead of playing
with notify code (again, if i'm not missing something too).
i'm cooking a patch to show (once it's tested i'll send it out).
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