linux-kernel - Re: [PATCH 04/56] fs: Macros to define splice file

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Message-ID: <CAFLxGvzOoXrQZyKmX402g9eiwX_2zVVCysx+qNzZdzE=uydnAA@mail.gmail.com>
Date:	Thu, 13 Nov 2014 22:49:07 +0100
From:	Richard Weinberger <richard.weinberger@...il.com>
To:	Pieter Smith <pieter@...sman.nl>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Jeff Layton <jlayton@...chiereds.net>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/56] fs: Macros to define splice file_operations

On Thu, Nov 13, 2014 at 10:22 PM, Pieter Smith <pieter@...sman.nl> wrote:
> Provides a CONFIG_SYSCALL_SPLICE compatible way of defining the .splice_read
> and .splice_write file_operations so that they can later be compiled out when
> the kernel is configured without the splice-family syscalls
>
> Signed-off-by: Pieter Smith <pieter@...sman.nl>
> ---
>  include/linux/fs.h | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 9418772..a88de9f 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -1512,6 +1512,32 @@ struct file_operations {
>         int (*show_fdinfo)(struct seq_file *m, struct file *f);
>  };
>
> +#ifdef CONFIG_SYSCALL_SPLICE
> +
> +/*
> + * Define and init the splice_read member of a file_operations struct
> + */
> +#define SPLICE_READ_INIT(read) .splice_read = read,
> +
> +/*
> + * Define and init the splice_read member of a file_operations struct
> + */
> +#define SPLICE_WRITE_INIT(write) .splice_write = write,

This is ugly like hell.
Why can't you do something like __exit_p()?

-- 
Thanks,
//richard
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