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@xxxxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> ---
> 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
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