linux-kernel - Re: [PATCH v5 06/10] eventfs: Implement eventfs lookup, read, open functions

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Date:   Wed, 26 Jul 2023 16:51:16 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ajay Kaher <akaher@...are.com>
Cc:     shuah@...nel.org, mhiramat@...nel.org, chinglinyu@...gle.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, lkp@...el.com,
        namit@...are.com, oe-lkp@...ts.linux.dev, amakhalov@...are.com,
        er.ajay.kaher@...il.com, srivatsa@...il.mit.edu, tkundu@...are.com,
        vsirnapalli@...are.com
Subject: Re: [PATCH v5 06/10] eventfs: Implement eventfs lookup, read, open
 functions

On Sun, 23 Jul 2023 01:07:01 +0530
Ajay Kaher <akaher@...are.com> wrote:

> +void eventfs_set_ef_status_free(struct dentry *dentry)
> +{
> +	struct tracefs_inode *ti_parent;
> +	struct eventfs_file *ef;
> +
> +	mutex_lock(&eventfs_mutex);
> +	ti_parent = get_tracefs(dentry->d_parent->d_inode);
> +	if (!ti_parent || !(ti_parent->flags & TRACEFS_EVENT_INODE))
> +		goto out;
> +
> +	ef = dentry->d_fsdata;
> +	if (!ef)
> +		goto out;
> +


> +	/*
> +	 * If ef was freed, then the LSB bit is set for d_fsdata.
> +	 * But this should not happen, as it should still have a
> +	 * ref count that prevents it. Warn in case it does.
> +	 */
> +	if (WARN_ON_ONCE((unsigned long)ef & 1))
> +		goto out;

Can you add this part to Patch 8: eventfs: Implement removal of meta data from eventfs ?

That way the pointer logic is all added together.

-- Steve


> +
> +	dentry->d_fsdata = NULL;
> +	ef->dentry = NULL;
> +out:
> +	mutex_unlock(&eventfs_mutex);
> +}
> +