linux-kernel - Re: [PATCH 1/2] tracing: Make the backup instance readonly

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Message-Id: <20260108143001.95237e93acda8c03e617b116@kernel.org>
Date: Thu, 8 Jan 2026 14:30:01 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] tracing: Make the backup instance readonly

On Wed, 7 Jan 2026 22:05:42 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Thu, 8 Jan 2026 11:51:25 +0900
> Masami Hiramatsu (Google) <mhiramat@...nel.org> wrote:
> 
> > > We may need to make sure they can't be changed to write as well. But that
> > > will require a change to tracefs (and eventfs).  
> > 
> > Ah, you mean the permission check is not correctly done in tracefs/eventfs yet?
> 
> Actually, i think we could use a different fops for read only instances
> that do not have a write callback. And for eventfs we could have it for
> read only instances to only create the id and format files.

Ah, OK. Let me update it.

Thanks,

> 
> -- Steve


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>