new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/logfs/dir.c b/fs/logfs/dir.c
index 26e4a94..b827510 100644
--- a/fs/logfs/dir.c
+++ b/fs/logfs/dir.c
@@ -284,7 +284,7 @@
 #define IMPLICIT_NODES 2
 static int __logfs_readdir(struct file *file, void *buf, filldir_t filldir)
 {
-	struct inode *dir = file->f_dentry->d_inode;
+	struct inode *dir = file_inode(file);
 	loff_t pos = file->f_pos - IMPLICIT_NODES;
 	struct page *page;
 	struct logfs_disk_dentry *dd;
@@ -320,7 +320,7 @@
 
 static int logfs_readdir(struct file *file, void *buf, filldir_t filldir)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	ino_t pino = parent_ino(file->f_dentry);
 	int err;