linux-kernel - Re: [PATCH] writeback: Don't wait for completion in writeback_inodes_sb

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Date:	Tue, 12 Jul 2011 06:41:32 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Jan Kara <jack@...e.cz>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Curt Wohlgemuth <curtw@...gle.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	fengguang.wu@...el.com
Subject: Re: [PATCH] writeback: Don't wait for completion in
 writeback_inodes_sb_nr

On Tue, Jul 12, 2011 at 12:34:53PM +0200, Jan Kara wrote:
> > All block device inodes sit on blockdev_superblock, we got rid of inodes
> > without a superblock long time ago.
>   Sure, we can easily iterate also blockdev_superblock. What I meant is
> that blockdev_superblock will need a special handling since we otherwise
> ignore pseudo superblocks...

Pseudo superblocks aren't ignored.  They are added to super_blocks like
all others, and iterate_supers doesn't skip over them.  The problem
is that blockdev_superblock doesn't have a proper s_bdi set, and thus
gets skipped over by __sync_filesystem. 

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