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

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Message-ID: <20110630123759.GA14956@infradead.org>
Date:	Thu, 30 Jun 2011 08:37:59 -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 Thu, Jun 30, 2011 at 02:15:58PM +0200, Jan Kara wrote:
>   Yes. Actually, specifically for filesystems like XFS which update inode
> after IO completion we would need more passes to be efficient and correct:
>   for all inodes
>     fdatawrite
>   for all inodes
>     fdatawait
>   for all inodes
>     write_inode
>   for all inodes
>     wait for inode IO
> 
>   But maybe this could be handled by having new WB_SYNC_ mode indicating
> that writeback_single_inode() should not bother waiting (thus we'd really
> end up waiting in sync_inodes_sb()) and then XFS and other filesystems that
> need it would writeout inodes in their sync_fs() implementation (possibly
> using a generic helper)?

We do very little in write_inode these days.  Basically just log the
inode size and timestamp sized into the in-memory log.  The actual
writeout of the log happens in ->sync_fs already.

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