ocfs2-devel.lists.linux.dev archive mirror
 help / color / mirror / Atom feed
From: Joseph Qi <joseph.qi@linux.alibaba.com>
To: Gang He <ghe@suse.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: Mon, 6 Sep 2021 19:14:26 +0800	[thread overview]
Message-ID: <41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com> (raw)
In-Reply-To: <20210826075941.28480-1-ghe@suse.com>

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?

Thanks,
Joseph



_______________________________________________
Ocfs2-devel mailing list
Ocfs2-devel@oss.oracle.com
https://oss.oracle.com/mailman/listinfo/ocfs2-devel

  parent reply	other threads:[~2021-09-06 11:15 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 [this message]
2021-09-07  9:40   ` Gang He

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=41bc413d-0926-0eae-6772-076314bbae53@linux.alibaba.com \
    --to=joseph.qi@linux.alibaba.com \
    --cc=ghe@suse.com \
    --cc=jlbec@evilplan.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark@fasheh.com \
    --cc=ocfs2-devel@oss.oracle.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).