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

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Date:	Thu, 14 Jul 2016 10:52:25 +0800
From:	Lv Zheng <lv.zheng@...el.com>
To:	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>
Cc:	Lv Zheng <lv.zheng@...el.com>, Lv Zheng <zetalog@...il.com>,
	<linux-kernel@...r.kernel.org>, linux-acpi@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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