autofs4: Pushdown the bkl from ioctl

Pushdown the bkl to autofs4_root_ioctl.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ian Kent <raven@themaw.net>
Cc: Autofs <autofs@linux.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: John Kacur <jkacur@redhat.com>
Cc: Arnd Bergmann <arnd@arndb.de>

1 files changed, 18 insertions, 4 deletions

diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index e8e5e63ac950..db4117ed7803 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -18,13 +18,14 @@
 #include <linux/slab.h>
 #include <linux/param.h>
 #include <linux/time.h>
+#include <linux/smp_lock.h>
 #include "autofs_i.h"
 
 static int autofs4_dir_symlink(struct inode *,struct dentry *,const char *);
 static int autofs4_dir_unlink(struct inode *,struct dentry *);
 static int autofs4_dir_rmdir(struct inode *,struct dentry *);
 static int autofs4_dir_mkdir(struct inode *,struct dentry *,int);
-static int autofs4_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
+static long autofs4_root_ioctl(struct file *,unsigned int,unsigned long);
 static int autofs4_dir_open(struct inode *inode, struct file *file);
 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
 static void *autofs4_follow_link(struct dentry *, struct nameidata *);
@@ -38,7 +39,7 @@ const struct file_operations autofs4_root_operations = {
         .read           = generic_read_dir,
         .readdir        = dcache_readdir,
         .llseek         = dcache_dir_lseek,
-        .ioctl          = autofs4_root_ioctl,
+        .unlocked_ioctl = autofs4_root_ioctl,
 };
 
 const struct file_operations autofs4_dir_operations = {
@@ -902,8 +903,8 @@ int is_autofs4_dentry(struct dentry *dentry)
  * ioctl()'s on the root directory is the chief method for the daemon to
  * generate kernel reactions
  */
-static int autofs4_root_ioctl(struct inode *inode, struct file *filp,
-                             unsigned int cmd, unsigned long arg)
+static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
+                                       unsigned int cmd, unsigned long arg)
 {
         struct autofs_sb_info *sbi = autofs4_sbi(inode->i_sb);
         void __user *p = (void __user *)arg;
@@ -947,3 +948,16 @@ static int autofs4_root_ioctl(struct inode *inode, struct file *filp,
                 return -ENOSYS;
         }
 }
+
+static long autofs4_root_ioctl(struct file *filp,
+                               unsigned int cmd, unsigned long arg)
+{
+        long ret;
+        struct inode *inode = filp->f_dentry->d_inode;
+
+        lock_kernel();
+        ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
+        unlock_kernel();
+
+        return ret;
+}