linux-kernel - Re: [PATCH 2/2] fs: build the legacy direct I/O code conditionally

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Date:   Wed, 25 Jan 2023 10:18:34 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] fs: build the legacy direct I/O code conditionally

On Wed, Jan 25, 2023 at 07:58:39AM +0100, Christoph Hellwig wrote:
> Add a new LEGACY_DIRECT_IO config symbol that is only selected by the
> file systems that still use the legacy blockdev_direct_IO code, so that
> kernels without support for those file systems don't need to build the
> code.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---
>  fs/Kconfig          | 4 ++++
>  fs/Makefile         | 3 ++-
>  fs/affs/Kconfig     | 1 +
>  fs/exfat/Kconfig    | 1 +
>  fs/ext2/Kconfig     | 1 +
>  fs/fat/Kconfig      | 1 +
>  fs/hfs/Kconfig      | 1 +
>  fs/hfsplus/Kconfig  | 1 +
>  fs/jfs/Kconfig      | 1 +
>  fs/nilfs2/Kconfig   | 1 +
>  fs/ntfs3/Kconfig    | 1 +
>  fs/ocfs2/Kconfig    | 1 +
>  fs/reiserfs/Kconfig | 1 +
>  fs/udf/Kconfig      | 1 +
>  14 files changed, 18 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/Kconfig b/fs/Kconfig
> index 2685a4d0d35318..e99830c650336a 100644
> --- a/fs/Kconfig
> +++ b/fs/Kconfig
> @@ -18,6 +18,10 @@ config VALIDATE_FS_PARSER
>  config FS_IOMAP
>  	bool
>  
> +# old blockdev_direct_IO implementation.  Use iomap for new code instead
> +config LEGACY_DIRECT_IO
> +	bool
> +
>  if BLOCK
>  

Reviewed-by: Eric Biggers <ebiggers@...gle.com>

- Eric