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

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Message-ID: <CAKYAXd-1N0gpR3nXmeZGDm_k_K+DXNhEDxv-8YvKD2W9WeCXaA@mail.gmail.com>
Date:	Mon, 17 Sep 2012 23:14:42 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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.

2012/9/17 OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>:
> 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.
No, problem. Thanks~
>
> Thanks.
> --
> OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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