linux-kernel - Re: [PATCH] tracefs/eventfs: Use root and instance inodes as default ownership

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Date: Thu, 4 Jan 2024 01:48:37 +0000
From: Al Viro <viro@...iv.linux.org.uk>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
	Linux Trace Kernel <linux-trace-kernel@...r.kernel.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] tracefs/eventfs: Use root and instance inodes as default
 ownership

On Wed, Jan 03, 2024 at 08:32:46PM -0500, Steven Rostedt wrote:

> +	/* Get the tracefs root from the parent */
> +	inode = d_inode(dentry->d_parent);
> +	inode = d_inode(inode->i_sb->s_root);

That makes no sense.  First of all, for any positive dentry we have
dentry->d_sb == dentry->d_inode->i_sb.  And it's the same for all
dentries on given superblock.  So what's the point of that dance?
If you want the root inode, just go for d_inode(dentry->d_sb->s_root)
and be done with that...