linux-kernel - Re: [PATCH 9/9] pstore/blk: don't depend on CONFIG

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Date:   Tue, 1 Dec 2020 11:53:23 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        Tony Luck <tony.luck@...el.com>,
        WeiXiong Liao <liaoweixiong@...winnertech.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] pstore/blk: don't depend on CONFIG_BLOCK

On Fri, Oct 16, 2020 at 03:20:47PM +0200, Christoph Hellwig wrote:
> pstore-blk contains of two different layers:
> 
>  a) a tiny layer of sugar coating ontop of pstore-zone.  This part has
>     no dependencies on the block layer, and can be used e.g. by mtd
>  b) an implementation of a default fallback pstore zone backend for
>     block devices
> 
> Add an ifdef for the latter so that pstore-blk itself does not have to
> depend on CONFIG_BLOCK.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

AFAIU, this can't be done until the read/write changes from patch 8 are
adopted, so, for now, I'm not taking this either.

-Kees

> ---
>  fs/pstore/Kconfig | 2 +-
>  fs/pstore/blk.c   | 2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/pstore/Kconfig b/fs/pstore/Kconfig
> index e16a49ebfe546d..6eadb538316e52 100644
> --- a/fs/pstore/Kconfig
> +++ b/fs/pstore/Kconfig
> @@ -164,7 +164,7 @@ config PSTORE_ZONE
>  config PSTORE_BLK
>  	tristate "Log panic/oops to a block device"
>  	depends on PSTORE
> -	depends on BLOCK
> +	depends on BLOCK || !BLOCK
>  	select PSTORE_ZONE
>  	default n
>  	help
> diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c
> index bd4eadfc9bd795..d3d25edb943cdd 100644
> --- a/fs/pstore/blk.c
> +++ b/fs/pstore/blk.c
> @@ -182,6 +182,7 @@ void unregister_pstore_device(const struct pstore_zone_ops *ops)
>  }
>  EXPORT_SYMBOL_GPL(unregister_pstore_device);
>  
> +#ifdef CONFIG_BLOCK
>  static struct file *psblk_file;
>  
>  static ssize_t psblk_generic_blk_read(char *buf, size_t bytes, loff_t pos)
> @@ -269,6 +270,7 @@ void __init pstore_blk_early_init(void)
>  	__pstore_blk_init(devname);
>  }
>  #endif /* MODULE */
> +#endif /* CONFIG_BLOCK */
>  
>  /* get information of pstore/blk */
>  int pstore_blk_get_config(struct pstore_blk_config *info)
> -- 
> 2.28.0
> 

-- 
Kees Cook