linux-kernel - Re: [5/7] ext4: Wait for writeback to complete while making pages writable

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Message-ID: <20110518181711.GB13693@thunk.org>
Date:	Wed, 18 May 2011 14:17:11 -0400
From:	Ted Ts'o <tytso@....edu>
To:	"Darrick J. Wong" <djwong@...ibm.com>
Cc:	Jan Kara <jack@...e.cz>, Alexander Viro <viro@...iv.linux.org.uk>,
	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Jens Axboe <axboe@...nel.dk>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Jeff Layton <jlayton@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	Chris Mason <chris.mason@...cle.com>,
	Joel Becker <jlbec@...lplan.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-ext4@...r.kernel.org, Mingming Cao <mcao@...ibm.com>
Subject: Re: [5/7] ext4: Wait for writeback to complete while making pages
 writable

On Mon, May 09, 2011 at 01:03:56PM -0000, Darrick J. Wong wrote:
> In order to stabilize pages during disk writes, ext4_page_mkwrite must wait for
> writeback operations to complete before making a page writable.  Furthermore,
> the function must return locked pages, and recheck the writeback status if the
> page lock is ever dropped.  The "someone could wander in" part of this patch
> was suggested by Chris Mason.
> 
> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> 
> ---
> fs/ext4/inode.c |   24 +++++++++++++++++++-----
>  1 files changed, 19 insertions(+), 5 deletions(-)

Added to the ext4 tree, thanks.

					- Ted
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