linux-kernel - RE: [PATCH 1/3] debugfs: Add .fsync() callback proxy support

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Date:	Tue, 19 Jul 2016 08:13:19 +0000
From:	"Zheng, Lv" <lv.zheng@...el.com>
To:	"Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	"Brown, Len" <len.brown@...el.com>
CC:	Lv Zheng <zetalog@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: RE: [PATCH 1/3] debugfs: Add .fsync() callback proxy support

Hi, Greg

Sorry for the noise.
It's better to use ioctl to implement this functionality.
Please ignore this series.
It's already possible to implement ioctl for a debugfs file.

Thanks and best regards
-Lv

> From: Zheng, Lv
> Subject: [PATCH 1/3] debugfs: Add .fsync() callback proxy support
> 
> This patch adds .fsync() callback for debugfs files.
> ACPI AML debugger needs to implement this to flush cmds/logs.
> 
> Signed-off-by: Lv Zheng <lv.zheng@...el.com>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  fs/debugfs/file.c |    6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
> index 592059f..f863a0c 100644
> --- a/fs/debugfs/file.c
> +++ b/fs/debugfs/file.c
> @@ -172,6 +172,10 @@ FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
>  		PROTO(struct file *filp, unsigned int cmd, unsigned long
> arg),
>  		ARGS(filp, cmd, arg));
> 
> +FULL_PROXY_FUNC(fsync, int, filp,
> +		PROTO(struct file *filp, loff_t start, loff_t end, int datasync),
> +		ARGS(filp, start, end, datasync));
> +
>  static unsigned int full_proxy_poll(struct file *filp,
>  				struct poll_table_struct *wait)
>  {
> @@ -226,6 +230,8 @@ static void __full_proxy_fops_init(struct
> file_operations *proxy_fops,
>  		proxy_fops->poll = full_proxy_poll;
>  	if (real_fops->unlocked_ioctl)
>  		proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl;
> +	if (real_fops->fsync)
> +		proxy_fops->fsync = full_proxy_fsync;
>  }
> 
>  static int full_proxy_open(struct inode *inode, struct file *filp)
> --
> 1.7.10