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

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Message-ID: <502D0C6A.3010908@parallels.com>
Date:	Thu, 16 Aug 2012 19:06:18 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Al Viro <viro@...IV.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	"J. Bruce Fields" <bfields@...ldses.org>
CC:	James Bottomley <jbottomley@...allels.com>,
	"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 08/16/2012 06:55 PM, Al Viro wrote:
> On Thu, Aug 16, 2012 at 06:48:35PM +0400, Cyrill Gorcunov wrote:
> 
>>> Good luck doing that with e.g. VFAT...  And then there's such thing
>>> as filesystems that don't have ->encode_fh() for a lot of very good
>>
>> Wait, Al, it seems I messed up. If some fs has no encode_fh() implemented
>> the default encoding with FILEID_INO32_GEN_PARENT will be used for that.
> 
> ... which doesn't work for a lot of filesystems.  Not if you want to be
> able to decode the result afterwards and get something useful out of
> that.  Trying to implement ->fh_to_dentry(), especially with fhandle
> generated by inode alone is going to be really interesting for a bunch
> of stuff...
> .
> 

Hm... Then I suppose the best we can do is -- show in a fdinfo file the inode
number, device where it is and a filehandle _iff_ provided by a filesystem.
For fanotify/dnotify -- only a path.

Thanks,
Pavel
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