linux-ext4 - Re: [PATCH v2 01/11] ext4: prevent parallel resizers by atomic bit ops

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Message-ID: <20110727013822.GD19851@thunk.org>
Date:	Tue, 26 Jul 2011 21:38:22 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org, adilger@...ger.ca, amir73il@...il.com,
	tm@....ma
Subject: Re: [PATCH v2 01/11] ext4: prevent parallel resizers by atomic bit
 ops

On Tue, Jul 19, 2011 at 12:02:07PM +0800, Yongqiang Yang wrote:
> Before this patch, parallel resizers are allowed and protected by a mutex lock,
> actually, there is no need to support parallel resizer, so this patch prevents
> parallel resizers by atmoic bit ops, like lock_page() and unlock_page() do.
> 
> To do this, the patch removed the mutex lock s_resize_lock from struct ext4_sb_info
> and added a unsigned long field named s_resize_flags which inidicates if there is
> a resizer.
> 
> Signed-off-by: Yongqiang Yang <xiaoqiangnk@...il.com>

Thanks, added to the ext4 patch.

					- Ted
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