new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
index f20edcb..752f0b2 100644
--- a/fs/ocfs2/ioctl.c
+++ b/fs/ocfs2/ioctl.c
@@ -881,7 +881,7 @@
 
 long ocfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
-	struct inode *inode = filp->f_path.dentry->d_inode;
+	struct inode *inode = file_inode(filp);
 	unsigned int flags;
 	int new_clusters;
 	int status;
@@ -994,7 +994,7 @@
 {
 	bool preserve;
 	struct reflink_arguments args;
-	struct inode *inode = file->f_path.dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct ocfs2_info info;
 	void __user *argp = (void __user *)arg;