linux-ext4 - Re: [PATCH] ext4: Unregister features interface on module unload

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Date:	Mon, 24 Jan 2011 18:49:41 +0100 (CET)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Lukas Czerner <lczerner@...hat.com>
cc:	linux-ext4@...r.kernel.org, tytso@....edu, sandeen@...hat.com
Subject: Re: [PATCH] ext4: Unregister features interface on module unload

On Mon, 17 Jan 2011, Lukas Czerner wrote:

> Ext4 features interface was not properly unregistered which led to
> problems while unloading/reloading ext4 module. This commit fixes that by
> adding proper kobject unregistration code into ext4_exit_fs() as well as
> fail-path of ext4_init_fs()
> 
> Signed-off-by: Lukas Czerner <lczerner@...hat.com>
> Reported-by: Eric Sandeen <sandeen@...hat.com>
> ---
>  fs/ext4/super.c |   12 ++++++++++--
>  1 files changed, 10 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index cb10a06..124d304 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -4779,7 +4779,7 @@ static struct file_system_type ext4_fs_type = {
>  	.fs_flags	= FS_REQUIRES_DEV,
>  };
>  
> -int __init ext4_init_feat_adverts(void)
> +static int __init ext4_init_feat_adverts(void)
>  {
>  	struct ext4_features *ef;
>  	int ret = -ENOMEM;
> @@ -4803,6 +4803,13 @@ out:
>  	return ret;
>  }
>  
> +static void ext4_exit_feat_adverts(void)
> +{
> +	kobject_put(&ext4_feat->f_kobj);
> +	wait_for_completion(&ext4_feat->f_kobj_unregister);
> +	kfree(ext4_feat);
> +}
> +
>  static int __init ext4_init_fs(void)
>  {
>  	int err;
> @@ -4849,7 +4856,7 @@ out1:
>  out2:
>  	ext4_exit_mballoc();
>  out3:
> -	kfree(ext4_feat);
> +	ext4_exit_feat_adverts();
>  	remove_proc_entry("fs/ext4", NULL);
>  	kset_unregister(ext4_kset);
>  out4:
> @@ -4868,6 +4875,7 @@ static void __exit ext4_exit_fs(void)
>  	destroy_inodecache();
>  	ext4_exit_xattr();
>  	ext4_exit_mballoc();
> +	ext4_exit_feat_adverts();
>  	remove_proc_entry("fs/ext4", NULL);
>  	kset_unregister(ext4_kset);
>  	ext4_exit_system_zone();
> 

Hi Ted,

this should probably get in ASAP, so I can send it to the stable.

Thanks!
-Lukas
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