linux-kernel - Re: [PATCH] vfs: Merge sync_supers(), sync_filesystems() and sync

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Message-ID: <20090423110657.GA4833@infradead.org>
Date:	Thu, 23 Apr 2009 07:06:57 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	LKML <linux-kernel@...r.kernel.org>, linux-fsdevel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [PATCH] vfs: Merge sync_supers(), sync_filesystems() and
	sync_blockdevs()

On Wed, Apr 22, 2009 at 05:56:21PM +0200, Jan Kara wrote:
> These three functions are quite similar so merge them to save superblock list
> traversal code. As a bonus we get livelock avoidance for all these superblock
> traversals. Also remove the condition that if wait == 0 and sb->s_dirt is
> not set, then ->sync_fs() is not called. This does not really make much sence
> since s_dirt is generally used by filesystem to mean that ->write_super() needs
> to be called. But ->sync_fs() does different things. I even suspect that some
> filesystems (btrfs?) sets s_dirt just to fool this logic.

Please separate the s_dirt bit out into a small patch, that's something
we probably want for -stable, too.

Otherwise the patch looks reasonable.
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