linux-kernel - Re: [PATCH] jbd: jbd-debug and jbd2-debug should be writable.

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Message-ID: <20091204094932.GC4272@skywalker.linux.vnet.ibm.com>
Date:	Fri, 4 Dec 2009 15:19:32 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	"Yin, Kangkai" <kangkai.yin@...el.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] jbd: jbd-debug and jbd2-debug should be writable.

On Fri, Dec 04, 2009 at 11:17:35AM +0800, Yin, Kangkai wrote:
> Hi,
> 
> Re-send since seems my mail was dropped by vger, because of my wrong
> envelope_from..
> 
> ----
> I was trying to enable the jbd debug option, and found that jbd-debug
> in debugfs is read-only, shouldn't that be writable?
> 
> Found in both .31 stable kernel and .32 one.
> 
> Thanks,
> Kangkai
> 
> From 492ec0453ca3458c68deaa6e308ca01acc0eca1f Mon Sep 17 00:00:00 2001
> From: Yin Kangkai <kangkai.yin@...el.com>
> Date: Thu, 3 Dec 2009 18:01:38 +0800
> Subject: [PATCH] jbd: jbd-debug and jbd2-debug should be writable.
> 
> jbd-debug and jbd2-debug is currently read-only (S_IRUGO), which is not
> correct. Make it writable so that we can start debuging.
> 
> Signed-off-by: Yin Kangkai <kangkai.yin@...el.com>

Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>

> ---
>  fs/jbd/journal.c  |    2 +-
>  fs/jbd2/journal.c |    3 ++-
>  2 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/jbd/journal.c b/fs/jbd/journal.c
> index 4160afa..bd224ee 100644
> --- a/fs/jbd/journal.c
> +++ b/fs/jbd/journal.c
> @@ -1913,7 +1913,7 @@ static void __init jbd_create_debugfs_entry(void)
>  {
>  	jbd_debugfs_dir = debugfs_create_dir("jbd", NULL);
>  	if (jbd_debugfs_dir)
> -		jbd_debug = debugfs_create_u8("jbd-debug", S_IRUGO,
> +		jbd_debug = debugfs_create_u8("jbd-debug", S_IRUGO | S_IWUSR,
>  					       jbd_debugfs_dir,
>  					       &journal_enable_debug);
>  }
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index fed8538..3c41c5a 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2103,7 +2103,8 @@ static void __init jbd2_create_debugfs_entry(void)
>  {
>  	jbd2_debugfs_dir = debugfs_create_dir("jbd2", NULL);
>  	if (jbd2_debugfs_dir)
> -		jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME, S_IRUGO,
> +		jbd2_debug = debugfs_create_u8(JBD2_DEBUG_NAME,
> +					       S_IRUGO | S_IWUSR,
>  					       jbd2_debugfs_dir,
>  					       &jbd2_journal_enable_debug);
>  }
> -- 
> 1.6.5
> 
> --
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