linux-kernel - Re: [PATCH] tracing: Fix file mode of free

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Date:	Tue, 28 May 2013 15:31:57 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Wang YanQing <udknight@...il.com>
Cc:	fweisbec@...il.com, mingo@...hat.com, linux-kernel@...r.kernel.org,
	vnagarnaik@...gle.com, David Sharp <dhsharp@...gle.com>
Subject: Re: [PATCH] tracing: Fix file mode of free_buffer

David, Vaibhav,

Any comments on this patch?

-- Steve


On Sun, 2013-05-26 at 16:52 +0800, Wang YanQing wrote:
> Commit 4f271a2a60c748599b30bb4dafff30d770439b96
> (tracing: Add a proc file to stop tracing and free buffer)
> implement a method to free up ring buffer in kernel memory
> in the release code path of free_buffer's fd.
> 
> Then we don't need read/write support for free_buffer,
> indeed we just have a dummy write fop, and don't implement read fop.
> 
> So the 0200 is more reasonable file mode for free_buffer than
> the current file mode 0644.
> 
> Signed-off-by: Wang YanQing <udknight@...il.com>
> ---
>  kernel/trace/trace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
> index ae6fa2d..02d9875 100644
> --- a/kernel/trace/trace.c
> +++ b/kernel/trace/trace.c
> @@ -5927,7 +5927,7 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
>  	trace_create_file("buffer_total_size_kb", 0444, d_tracer,
>  			  tr, &tracing_total_entries_fops);
>  
> -	trace_create_file("free_buffer", 0644, d_tracer,
> +	trace_create_file("free_buffer", 0200, d_tracer,
>  			  tr, &tracing_free_buffer_fops);
>  
>  	trace_create_file("trace_marker", 0220, d_tracer,


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