linux-kernel - [PATCH] debugfs: Add proxy function for the mmap file operation

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Date:	Fri, 29 Jul 2016 15:34:59 +0100
From:	Liviu Dudau <Liviu.Dudau@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Brian Starkey <Brian.Starkey@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Nicolai Stange <nicstange@...il.com>
Subject: [PATCH] debugfs: Add proxy function for the mmap file operation

Add proxy function for the mmap file_operations hook under the
full_proxy_fops structure. This is useful for providing a custom
mmap routine in a driver's debugfs implementation.

Cc: Nicolai Stange <nicstange@...il.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@....com>
---
 fs/debugfs/file.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 592059f..d87148a 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -168,6 +168,10 @@ FULL_PROXY_FUNC(write, ssize_t, filp,
 			loff_t *ppos),
 		ARGS(filp, buf, size, ppos));
 
+FULL_PROXY_FUNC(mmap, int, filp,
+		PROTO(struct file *filp, struct vm_area_struct *vma),
+		ARGS(filp, vma));
+
 FULL_PROXY_FUNC(unlocked_ioctl, long, filp,
 		PROTO(struct file *filp, unsigned int cmd, unsigned long arg),
 		ARGS(filp, cmd, arg));
@@ -224,6 +228,8 @@ static void __full_proxy_fops_init(struct file_operations *proxy_fops,
 		proxy_fops->write = full_proxy_write;
 	if (real_fops->poll)
 		proxy_fops->poll = full_proxy_poll;
+	if (real_fops->mmap)
+		proxy_fops->mmap = full_proxy_mmap;
 	if (real_fops->unlocked_ioctl)
 		proxy_fops->unlocked_ioctl = full_proxy_unlocked_ioctl;
 }
-- 
2.9.0