linux-kernel - Re: [PATCH 0/4] fat: fix ESTALE errors

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Message-ID: <CAKYAXd_VyRg5PYjcYb_JtDeXHeMSRtwwT665hcMcf4WCer7a_Q@mail.gmail.com>
Date:	Mon, 20 Aug 2012 13:19:51 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Cc:	Al Viro <viro@...iv.linux.org.uk>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH 0/4] fat: fix ESTALE errors

2012/8/18, OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> Al Viro <viro@...IV.linux.org.uk> writes:
>
>> On Sat, Aug 18, 2012 at 05:41:39AM -0400, Namjae Jeon wrote:
>>> From: Namjae Jeon <namjae.jeon@...sung.com>
>>>
>>> This patch-set eliminates the client side ESTALE errors when
>>> a FAT partition exported over NFS has its dentries evicted
>>> from the cache.
>>>
>>> One of the reasons for this error is lack of permanent inode
>>> numbers on FAT which makes it difficult to construct persistent
>>> file handles.This can be overcome by using the on-disk location
>>> of the directory entries (i_pos) as the inode number.
>>
>> The hell it can.  You've just made them unstable on rename(2).
>
> As more hint. We can't use i_pos as the inode number.
>
> E.g. inode is unlinked but is still opened (orphaned inode), the dir
> entry is free and you can create the inode on same i_pos. After that,
> both inodes have same i_pos (so inode number).
>
> Thanks.
Hi. Ogawa.
Thanks for specific explanation. I will check it.
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
>
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