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

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Message-ID: <5033864A.5040809@parallels.com>
Date:	Tue, 21 Aug 2012 16:59:54 +0400
From:	Pavel Emelyanov <xemul@...allels.com>
To:	Boaz Harrosh <bharrosh@...asas.com>
CC:	"J. Bruce Fields" <bfields@...ldses.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Cyrill Gorcunov <gorcunov@...nvz.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>,
	James Bottomley <jbottomley@...allels.com>,
	Matthew Helsley <matt.helsley@...il.com>
Subject: Re: [patch 4/8] fs, exportfs: Add export_encode_inode_fh helper

On 08/21/2012 04:51 PM, Boaz Harrosh wrote:
> On 08/21/2012 03:29 PM, J. Bruce Fields wrote:
> <>
> 
>> OK.  So if you don't mind the fact that there are filesystems with
>> inotify support but not filehandle support, then I think generating a
>> filehandle early as you describe would work.  I guess it's a little more
>> memory per watched inode.
>>
> 
> 
> For the minority of FSs that do not have a filehandle support it should
> be easy to generate a generic one, that should work 95% of the time.

Yup, this is how exportfd_encode_fh currently works.

> Are we guaranteed that after the checkpoint restore the version of
> the Kernel is the same as the one that did the checkpoint? If yes
> then I don't see any problem.

Strictly speaking -- no we don't. Migration should to work across kernel
versions (from older to newer). Why kernel version matters in this case?

>> --b.
> 
> 
> Cheers
> Boaz
> 

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