linux-kernel - Re: [PATCH v3 03/10] eventfs: adding eventfs dir add functions

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Message-ID: <20230703155226.1ab27bc1@gandalf.local.home>
Date:   Mon, 3 Jul 2023 15:52:26 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     "mhiramat@...nel.org" <mhiramat@...nel.org>,
        "shuah@...nel.org" <shuah@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-trace-kernel@...r.kernel.org" 
        <linux-trace-kernel@...r.kernel.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        Ching-lin Yu <chinglinyu@...gle.com>,
        Nadav Amit <namit@...are.com>,
        "srivatsa@...il.mit.edu" <srivatsa@...il.mit.edu>,
        Alexey Makhalov <amakhalov@...are.com>,
        Vasavi Sirnapalli <vsirnapalli@...are.com>,
        Tapas Kundu <tkundu@...are.com>,
        "er.ajay.kaher@...il.com" <er.ajay.kaher@...il.com>
Subject: Re: [PATCH v3 03/10] eventfs: adding eventfs dir add functions

On Mon, 3 Jul 2023 18:51:22 +0000
Ajay Kaher <akaher@...are.com> wrote:

> > 
> > We can also look to see if we can implement this with RCU. What exactly
> > is this rwsem protecting?
> >   
> 
> - struct eventfs_file holds the meta-data for file or dir.
> https://github.com/intel-lab-lkp/linux/blob/dfe0dc15a73261ed83cdc728e43f4b3d4e315aae/include/linux/tracefs.h#L28
> - eventfs_rwsem is supposed to protect the 'link-list which is made of struct eventfs_file
> ' and elements of struct eventfs_file.

RCU is usually the perfect solution for protecting link lists though. I'll
take a look at this when I get back to work.

-- Steve