linux-kernel - [PATCH 2/8] autofs: Pushdown the bkl from ioctl

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Date:	Wed, 19 May 2010 19:24:09 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Autofs <autofs@...ux.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	John Kacur <jkacur@...hat.com>, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 2/8] autofs: Pushdown the bkl from ioctl

Pushdown the bkl to autofs_root_ioctl.

Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Autofs <autofs@...ux.kernel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: John Kacur <jkacur@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>
---
 fs/autofs/root.c |   19 ++++++++++++++++---
 1 files changed, 16 insertions(+), 3 deletions(-)

diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 8713c7c..dc16b3c 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -25,12 +25,12 @@ static int autofs_root_symlink(struct inode *,struct dentry *,const char *);
 static int autofs_root_unlink(struct inode *,struct dentry *);
 static int autofs_root_rmdir(struct inode *,struct dentry *);
 static int autofs_root_mkdir(struct inode *,struct dentry *,int);
-static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
+static long autofs_root_ioctl(struct file *, unsigned int, unsigned long);
 
 const struct file_operations autofs_root_operations = {
 	.read		= generic_read_dir,
 	.readdir	= autofs_root_readdir,
-	.ioctl		= autofs_root_ioctl,
+	.unlocked_ioctl	= autofs_root_ioctl,
 };
 
 const struct inode_operations autofs_root_inode_operations = {
@@ -545,7 +545,7 @@ static inline int autofs_expire_run(struct super_block *sb,
  * ioctl()'s on the root directory is the chief method for the daemon to
  * generate kernel reactions
  */
-static int autofs_root_ioctl(struct inode *inode, struct file *filp,
+static int autofs_root_ioctl_unlocked(struct inode *inode, struct file *filp,
 			     unsigned int cmd, unsigned long arg)
 {
 	struct autofs_sb_info *sbi = autofs_sbi(inode->i_sb);
@@ -579,3 +579,16 @@ static int autofs_root_ioctl(struct inode *inode, struct file *filp,
 		return -ENOSYS;
 	}
 }
+
+static long autofs_root_ioctl(struct file *filp,
+			     unsigned int cmd, unsigned long arg)
+{
+	long ret;
+	struct inode *inode = filp->f_dentry->d_inode;
+
+	lock_kernel();
+	ret = autofs_root_ioctl_unlocked(inode, filp, cmd, arg);
+	unlock_kernel();
+
+	return ret;
+}
-- 
1.6.2.3

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