linux-kernel - RE: [PATCH] seq_file.h: introduce DECLARE_SEQ_FOPS

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Date:	Mon, 6 Jun 2011 16:19:15 -0500
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] seq_file.h: introduce DECLARE_SEQ_FOPS_{RO,RW}

On Monday, June 06, 2011 2:08 PM, Al Viro wrote:
> On Mon, Jun 06, 2011 at 01:19:45PM -0700, H Hartley Sweeten wrote:
>> Many of the procfs and debugfs attribute file_operations in the kernel are
>> missing the .owner information. Introduce some macro's to fill in the .owner
>> field as well as the common methods for virtual file file_operations.  This
>> simplifies creating the attributes and makes sure all the fields are properly
>> initialized.
>> 
>> Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
>
> Nacked-by: Al Viro <viro@...iv.linux.org.uk>
> Nacked-because: too ugly
>
> Don't play that kind of games with preprocessor.

Just an FYI, the exact same thing is being done with DEFINE_SIMPLE_ATTRIBUTE
in fs.h:

#define DEFINE_SIMPLE_ATTRIBUTE(__fops, __get, __set, __fmt)		\
static int __fops ## _open(struct inode *inode, struct file *file)	\
{									\
	__simple_attr_check_format(__fmt, 0ull);			\
	return simple_attr_open(inode, file, __get, __set, __fmt);	\
}									\
static const struct file_operations __fops = {				\
	.owner	 = THIS_MODULE,						\
	.open	 = __fops ## _open,					\
	.release = simple_attr_release,					\
	.read	 = simple_attr_read,					\
	.write	 = simple_attr_write,					\
	.llseek	 = generic_file_llseek,					\
};

Regards,
Hartley
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