linux-kernel - Re: [PATCH v3 2/5] fat: allocate persistent inode numbers

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Date:	Mon, 24 Sep 2012 13:39:35 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	akpm@...ux-foundation.org, bfields@...ldses.org,
	viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org,
	Namjae Jeon <namjae.jeon@...sung.com>,
	Ravishankar N <ravi.n1@...sung.com>,
	Amit Sahrawat <a.sahrawat@...sung.com>
Subject: Re: [PATCH v3 2/5] fat: allocate persistent inode numbers

Namjae Jeon <linkinjeon@...il.com> writes:

>> I think we don't need this. Because FH and ino is not necessary to have
>> relation.
>>
>> Can we re-introduce ->encode_fh() handler, and export i_pos again?  With
>> this, I think we can get i_pos correctly. Otherwise, ino may not contain
>> all bits of i_pos.
> I already tried to fix this issue using encode_fh without stable ino before.
> But I reached conclusion that we should use stable inode number.
>
> e.g. If we rebuild inode number using i_pos of fh, inode number is
> changed by i_unique.
> And It is not match with inode number of FH on NFS client. So estale
> error will happen.

What is problem if i_ino + i_generation is not match? I think, even if
those didn't match, i_pos in FH should resolve issue, no?
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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