linux-kernel - Re: [for-next][PATCH 3/3] tracefs/eventfs: Use root and instance inodes as default ownership

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Date: Thu, 4 Jan 2024 10:38:21 -0800
From: Linus Torvalds <torvalds@...ux-foundation.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Al Viro <viro@...iv.linux.org.uk>, 
	Christian Brauner <brauner@...nel.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [for-next][PATCH 3/3] tracefs/eventfs: Use root and instance
 inodes as default ownership

On Thu, 4 Jan 2024 at 08:46, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> Instead of walking the dentries on mount/remount to update the gid values of
> all the dentries if a gid option is specified on mount, just update the root
> inode. Add .getattr, .setattr, and .permissions on the tracefs inode
> operations to update the permissions of the files and directories.

Looks mostly good, thanks. This may add more lines than it removes,
but the lines it adds are *much* simpler than the removed ones.

I don't understand why you do those odd TRACEFS_INSTANCE_INODE games.
That seems entirely new functionality. The old'set_gid()' thing did
none of that, and just forced everything to new gid values.

IOW, this seems entirely random. I *suspect* that you have just tried
to retain some odd random semantics that happened to be the result of
a random implementation detail that came out of the dentry tree not
necessarily being fully populated by the time you did the remount.

So this seems wrong.

             Linus