From: Gang He <ghe@suse.com>
To: Joseph Qi <joseph.qi@linux.alibaba.com>,
mark@fasheh.com, jlbec@evilplan.org
Cc: linux-kernel@vger.kernel.org, ocfs2-devel@oss.oracle.com
Subject: Re: [Ocfs2-devel] [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process
Date: Tue, 7 Sep 2021 17:40:26 +0800 [thread overview]
Message-ID: <7510251b-0bf5-f14d-6c44-30385152a883@suse.com> (raw)
In-Reply-To: <41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com>
Hi Joseph,
On 2021/9/6 19:14, Joseph Qi wrote:
> Hi Gang,
>
>
> On 8/26/21 3:59 PM, Gang He wrote:
>> During the reflink process, we should acquire the target directory
>> inode dlm lock at the beginning, and hold this dlm lock until end
>> of the function.
>> With this patch, we avoid dlm lock ping-pong effect when clone
>> files to the same directory simultaneously from multiple nodes.
>> There is a typical user scenario, users regularly back up files
>> to a specified directory through the reflink feature from the
>> multiple nodes.
>>
> Since now it take dir inode lock across the whole reflink, it may impact
> other concurrent operations under the same directory.
> Have you evaluated such cases?
So far, I do not find there is any risk for taking dir inode lock across
the reflink function, it will block getting that dir inode lock a little
time, but avoid ping-pong effect during the reflink function.
Thanks
Gang
>
> Thanks,
> Joseph
>
>
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prev parent reply other threads:[~2021-09-07 9:47 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-26 7:59 [Ocfs2-devel] [PATCH] ocfs2: avoid getting dlm lock of the target directory multiple times during reflink process Gang He
2021-08-31 6:25 ` Gang He
2021-08-31 7:39 ` Joseph Qi
2021-09-07 15:57 ` Wengang Wang
2021-09-08 6:06 ` Gang He
2021-09-08 16:00 ` Wengang Wang
2021-09-14 7:34 ` Gang He
2021-09-14 17:50 ` Wengang Wang
2021-09-17 7:37 ` Gang He
2021-09-06 11:14 ` Joseph Qi
2021-09-07 9:40 ` Gang He [this message]
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