linux-kernel - Re: jbd : config_jbd_debug cannot create /proc entry

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Date:	Thu, 27 Sep 2007 00:23:11 -0500
From:	"Jose R. Santos" <jrs@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jan Kara <jack@...e.cz>, aneesh.kumar@...ux.vnet.ibm.com,
	richard@....demon.co.uk, sct@...hat.com,
	linux-kernel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: jbd : config_jbd_debug cannot create /proc entry

On Wed, 26 Sep 2007 14:35:39 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 25 Sep 2007 16:36:08 +0200
> Jan Kara <jack@...e.cz> wrote:
> 
> > > On Tue, 25 Sep 2007 07:49:38 -0500
> > > "Jose R. Santos" <jrs@...ibm.com> wrote:
> > > 
> > > > On Tue, 25 Sep 2007 13:50:46 +0200
> > > > Jan Kara <jack@....cz> wrote:
> > > > > > Jan Kara wrote:
> > > > > > >>
> > > > > > >-#define create_jbd_proc_entry() do {} while (0)
> > > > > > >-#define remove_jbd_proc_entry() do {} while (0)
> > > > > > >+static ctl_table fs_table[] = {
> > > > > > >+	{
> > > > > > >+                .ctl_name       = -1,	/* Don't want it */
> > > > > > 
> > > > > > 
> > > > > > 
> > > > > > shouldn't this be CTL_UNNUMBERED ?
> > > > >   Oh, it should be. I didn't notice we have this :) Thanks for notifying
> > > > > me. Attached is a fixed version.
> > > > 
> > > > This was fixed in JBD2 by moving the jbd-debug file to debugfs:
> > > > http://lkml.org/lkml/2007/7/11/334
> > > > 
> > > > Since this code is already in the kernel, we should keep it consistent. 
> > > > 
> > > 
> > > OK.  Here's a quick patch to fix this.  Adapted from the JBD2 patch.
> > > Let me know what you think.
> >   Looks fine - exactly what I've just done here :).
> 
> hm.  I found rather a lot of issues.  If this patch is derived from the
> JBD2 patch then perhaps the JBD2 patch needs some looking at.

Some of the changes do apply to the JBD2 patch.  I'll send a cleanup patch.

> 
> > >     Signed-off-by: Jose R. Santos <jrs@...ibm.com>
> >   You can add Signed-off-by: Jan Kara <jack@...e.cz>
> 
> I suspect you might be getting your signed-off-bys and acked-bys mixed up. 
> (If not this patch, then the previous one).  Please see
> Documentation/SubmittingPatches section 13 for the difference.
> 
> Jose, please review and if possible runtime test these proposed changes?

Agree with all the changes and they worked as expected on my system. 

> From: Andrew Morton <akpm@...ux-foundation.org>
> 
> - use `#ifdef foo' instead of `#if defined(foo)'
> 
> - CONFIG_JBD_DEBUG depends on CONFIG_DEBUG_FS so we don't need to duplicate
>   that logic in the .c file ifdefs
> 
> - Make journal_enable_debug __read_mostly just for the heck of it
> 
> - Make jbd_debugfs_dir and jbd_debug static
> 
> - debugfs_remove(NULL) is legal: remove unneeded tests
> 
> - jbd_create_debugfs_entry is a better name than create_jbd_debugfs_entry
> 
> - ditto remove_jbd_debugfs_entry
> 
> - C functions are preferred over macros
> 
> Cc: "Jose R. Santos" <jrs@...ibm.com>
> Cc: <linux-ext4@...r.kernel.org>
> Cc: Jan Kara <jack@...e.cz>
> Cc: Jose R. Santos <jrs@...ibm.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>

Acked-by: Jose R. Santos <jrs@...ibm.com>

-JRS
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