linux-kernel - Re: [PATCH v2 4/4] fat: switch to fsinfo

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Message-ID: <87bomuha77.fsf@devron.myhome.or.jp>
Date:	Sat, 14 Apr 2012 19:36:12 +0900
From:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
To:	dedekind1@...il.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Maling List <linux-kernel@...r.kernel.org>,
	Linux FS Maling List <linux-fsdevel@...r.kernel.org>,
	Artem Bityutskiy <artem.bityutskiy@...ux.intel.com>
Subject: Re: [PATCH v2 4/4] fat: switch to fsinfo_inode

Artem Bityutskiy <dedekind1@...il.com> writes:

>> Hm, does this guarantee to flush FSINFO at umount?
>
> Of course, and I checked it. It is just a dirty inode. If you do not
> worry that any other inode won't get written-beck, then you should not
> worry about this one.
>
>> FSINFO is last part of data dependency. I.e. inode change can dirty
>> FSINFO. So, FSINFO has to be flushed after normal inodes.
>
> Sorry, I do not see how this can be true. You have a just bunch of dirty
> inodes, and it does not matter in which order you flush them. See
> __fat_write_inode() - it does not change the FAT table and does not
> affect the FSINFO block.
>
> Besides, the _current_ code first writes out FSINFO, because VFS calls
> ->sync_fs() first, then it starts writing back, then VFS calls
> ->sync_fs() for the second time.

Common case is delayed allocation though, in the case of FATfs, it would
be only truncate by last iput().
-- 
OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
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