linux-kernel - Re: [PATCH v4] [SIGNED-OFF] ext4: don't work without procfs

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Message-ID: <alpine.LFD.2.00.1110111123330.3343@dhcp-27-109.brq.redhat.com>
Date:	Tue, 11 Oct 2011 11:27:11 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	"Ted Ts'o" <tytso@....edu>
cc:	Fabrice Jouhaud <yargil@...e.fr>, linux-ext4@...r.kernel.org,
	adilger.kernel@...ger.ca, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] [SIGNED-OFF] ext4: don't work without procfs

On Sat, 8 Oct 2011, Ted Ts'o wrote:

> On Thu, Oct 06, 2011 at 06:54:14PM +0200, Fabrice Jouhaud wrote:
> > Regression from commit dd68314ccf3fb918c1fb6471817edbc60ece4b52
> > The problem come from the test of the return value of proc_mkdir
> > that is always false without procfs and abort the init of ext4.
> > 
> > Signed-off-by: Fabrice Jouhaud <yargil@...e.fr>
> 
> Thanks, here's the patch that I ultimately checked in.
> 
> commit d44651d0f922b7aaeddd9fc04f2f5700a65983dd
> Author: Fabrice Jouhaud <yargil@...e.fr>
> Date:   Sat Oct 8 16:26:03 2011 -0400
> 
>     ext4: fix ext4 so it works without CONFIG_PROC_FS
>     
>     This fixes a bug which was introduced in dd68314ccf3fb.  The problem
>     came from the test of the return value of proc_mkdir which is always
>     false without procfs, and this would initialization of ext4.
>     
>     Signed-off-by: Fabrice Jouhaud <yargil@...e.fr>
>     Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 42f76c6..dcc4605 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -3540,10 +3540,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
>  		goto failed_mount;
>  	}
>  
> -#ifdef CONFIG_PROC_FS
>  	if (ext4_proc_root)
>  		sbi->s_proc = proc_mkdir(sb->s_id, ext4_proc_root);
> -#endif
>  
>  	bgl_lock_init(sbi->s_blockgroup_lock);
>  
> @@ -5070,13 +5068,11 @@ static int __init ext4_init_fs(void)
>  		return err;
>  	err = ext4_init_system_zone();
>  	if (err)
> -		goto out7;
> +		goto out6;
>  	ext4_kset = kset_create_and_add("ext4", NULL, fs_kobj);
>  	if (!ext4_kset)
> -		goto out6;
> -	ext4_proc_root = proc_mkdir("fs/ext4", NULL);
> -	if (!ext4_proc_root)
>  		goto out5;
> +	ext4_proc_root = proc_mkdir("fs/ext4", NULL);

Hi Ted,

I am not sure that this is very good. As I said several patch versions
back, it would be nice to print a warning in case that proc_mkdir()
fails even though procfs is compiled in. Otherwise this might hide
possible bugs.

Thanks!
-Lukas

>  
>  	err = ext4_init_feat_adverts();
>  	if (err)
> @@ -5112,12 +5108,12 @@ out2:
>  out3:
>  	ext4_exit_feat_adverts();
>  out4:
> -	remove_proc_entry("fs/ext4", NULL);
> -out5:
> +	if (ext4_proc_root)
> +		remove_proc_entry("fs/ext4", NULL);
>  	kset_unregister(ext4_kset);
> -out6:
> +out5:
>  	ext4_exit_system_zone();
> -out7:
> +out6:
>  	ext4_exit_pageio();
>  	return err;
>  }
> --
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