From: Liu Bo <bo.li.liu@oracle.com>
To: Josef Bacik <jbacik@fusionio.com>
Cc: "linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>
Subject: Re: [PATCH 1/5] Btrfs: fix deadlock with freeze and sync
Date: Fri, 14 Sep 2012 21:03:57 +0800 [thread overview]
Message-ID: <50532B3D.7060606@oracle.com> (raw)
In-Reply-To: <20120914124234.GJ12994@localhost.localdomain>
On 09/14/2012 08:42 PM, Josef Bacik wrote:
> On Fri, Sep 14, 2012 at 02:58:03AM -0600, Liu Bo wrote:
>> While testing xfstests 068, I realized that
>>
>> commit bd7de2c9a449e26a5493d918618eb20ae60d56bd
>> (Btrfs: fix deadlock with freeze and sync V2)
>>
>> did not fix the bug yet, since someone might jump in between checking
>> running transaction and joining transaction, and we may still run into
>> deadlock between freeze and sync.
>>
>> So IMO the safest and most efficient way is to check running transaction
>> in joining a transaction directly.
>>
>> With this patch, I tested xfstests 068 for 120 times and it did not get
>> into deadlock at least here.
>>
>
> This doesn't do anything since sync() won't have a transaction already started
> so this will always just return and we won't do a commit, NAK. Thanks,
>
Yeah, I'm digging this one, there is something wrong elsewhere, and Miao has pointed my fault :)
thanks,
liubo
> Josef
>
next prev parent reply other threads:[~2012-09-14 13:04 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 8:58 [PATCH 1/5] Btrfs: fix deadlock with freeze and sync Liu Bo
2012-09-14 8:58 ` [PATCH 2/5] Btrfs: fix trans block rsv regression Liu Bo
2012-09-14 11:15 ` David Sterba
2012-09-14 11:25 ` Liu Bo
2012-09-14 12:07 ` David Sterba
2012-09-14 12:16 ` Liu Bo
2012-09-14 12:41 ` Josef Bacik
2012-09-14 13:01 ` Liu Bo
2012-09-14 13:05 ` Liu Bo
2012-09-23 10:08 ` Miao Xie
2012-09-14 13:26 ` David Sterba
2012-09-14 8:58 ` [PATCH 3/5] Btrfs: cleanup for duplicated code in find_free_extent Liu Bo
2012-09-14 11:36 ` David Sterba
2012-09-14 8:58 ` [PATCH 4/5] Btrfs: cleanup fs_info->hashers Liu Bo
2012-09-14 11:21 ` David Sterba
2012-09-14 8:58 ` [PATCH 5/5] Btrfs: kill obsolete arguments in btrfs_wait_ordered_extents Liu Bo
2012-09-14 12:45 ` Josef Bacik
2012-09-14 12:55 ` Liu Bo
2012-09-14 13:01 ` Josef Bacik
2012-09-14 13:09 ` David Sterba
2012-09-14 10:07 ` [PATCH 1/5] Btrfs: fix deadlock with freeze and sync Miao Xie
2012-09-14 11:30 ` Liu Bo
2012-09-14 12:42 ` Josef Bacik
2012-09-14 13:03 ` Liu Bo [this message]
2012-09-14 14:41 ` Josef Bacik
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