linux-kernel - Re: [PATCH v3 0/5] fat: make persistent inode numbers and stablize for NFS.

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Message-ID: <87k3vs6bjm.fsf@devron.myhome.or.jp>
Date:	Mon, 17 Sep 2012 22:09:33 +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>
Subject: Re: [PATCH v3 0/5] fat: make persistent inode numbers and stablize for NFS.

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

> 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 numbers.
>
> Once the i_pos is available, it is only a matter of reading the directory
> entries from the disk clusters to locate the matching entry and rebuild
> the corresponding inode.
>
> We reached the conclusion support stable inode's read-only export first after
> discussing with OGAWA and Bruce.
> And will make it writable with some operation(unlink and rename) limitation
> next time.
>
> Namjae Jeon (4)
>  fat: modify nfs mount option
>  fat: allocate persistent inode numbers
>  fat (exportfs): rebuild inode if ilookup() fails
>  fat (exportfs): rebuild directory-inode if fat_dget() fails
>  Documentation: update nfs option in filesystem/vfat.txt

Sorry for late, I will review at next weekend.

Thanks.
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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