linux-kernel - Re: [PATCH 5/6] writeback: fix queue

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20100712151518.d4cdfebc.akpm@linux-foundation.org>
Date:	Mon, 12 Jul 2010 15:15:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	Martin Bligh <mbligh@...gle.com>,
	Michael Rubin <mrubin@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	<linux-fsdevel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] writeback: fix queue_io() ordering

On Sun, 11 Jul 2010 10:07:01 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> This was not a bug, since b_io is empty for kupdate writeback.
> The next patch will do requeue_io() for non-kupdate writeback,
> so let's fix it.
> 
> CC: Dave Chinner <david@...morbit.com>
> Cc: Martin Bligh <mbligh@...gle.com>
> Cc: Michael Rubin <mrubin@...gle.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Fengguang Wu <wfg@...l.ustc.edu.cn>

I assumed you didn't mean to sign this twice so I removed this signoff.

> Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
> ---
>  fs/fs-writeback.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
> 
> --- linux-next.orig/fs/fs-writeback.c	2010-07-11 09:13:31.000000000 +0800
> +++ linux-next/fs/fs-writeback.c	2010-07-11 09:13:32.000000000 +0800
> @@ -252,11 +252,14 @@ static void move_expired_inodes(struct l
>  }
>  
>  /*
> - * Queue all expired dirty inodes for io, eldest first.
> + * Queue all expired dirty inodes for io, eldest first:
> + * (newly dirtied) => b_dirty inodes
> + *                 => b_more_io inodes
> + *                 => remaining inodes in b_io => (dequeue for sync)
>   */
>  static void queue_io(struct bdi_writeback *wb, unsigned long *older_than_this)
>  {
> -	list_splice_init(&wb->b_more_io, wb->b_io.prev);
> +	list_splice_init(&wb->b_more_io, &wb->b_io);
>  	move_expired_inodes(&wb->b_dirty, &wb->b_io, older_than_this);
>  }

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/