linux-kernel - Re: [PATCH v5 0/8] fat: fix estale error on VFAT over NFS.

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Message-ID: <87624rfgav.fsf@devron.myhome.or.jp>
Date:	Tue, 27 Nov 2012 20:15:04 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	Namjae Jeon <linkinjeon@...il.com>
Cc:	akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Namjae Jeon <namjae.jeon@...sung.com>
Subject: Re: [PATCH v5 0/8] fat: fix estale error on VFAT over 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 fat_encode_fh() that include i_pos in file handle.
>
> 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.

I will review at this weekend. sorry.

> Namjae Jeon (8)
>  fat: modify nfs mount option
>  fat: move fat_i_pos_read to fat.h
>  fat: pass superblock pointer instead of inode pointer to fat_ent_read()
>  fat: introduce a helper fat_get_blknr_offset()
>  fat: restructure export_operations
>  fat (exportfs): rebuild inode if ilookup() fails
>  fat (exportfs): rebuild directory-inode if fat_dget() fails
>  Documentation: update nfs option in filesystem/vfat.txt
>
> ---
> 1.7.9.5
>

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