ovl: move cache and version to ovl_inode

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/ovl_entry.h

@@ -35,12 +35,8 @@ struct ovl_fs {
 
 /* private information held for every overlayfs dentry */
 struct ovl_entry {
-	struct ovl_dir_cache *cache;
 	union {
-		struct {
-			u64 version;
 		bool opaque;
-		};
 		struct rcu_head rcu;
 	};
 	unsigned numlower;
@@ -50,7 +46,9 @@ struct ovl_entry {
 struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
 
 struct ovl_inode {
+	struct ovl_dir_cache *cache;
 	const char *redirect;
+	u64 version;
 	unsigned long flags;
 	struct inode vfs_inode;
 	struct dentry *__upperdentry;

fs/overlayfs/super.c

@@ -169,7 +169,9 @@ static struct inode *ovl_alloc_inode(struct super_block *sb)
 {
 	struct ovl_inode *oi = kmem_cache_alloc(ovl_inode_cachep, GFP_KERNEL);
 
+	oi->cache = NULL;
 	oi->redirect = NULL;
+	oi->version = 0;
 	oi->flags = 0;
 	oi->__upperdentry = NULL;
 	oi->lower = NULL;

fs/overlayfs/util.c

@@ -160,16 +160,12 @@ struct inode *ovl_inode_real(struct inode *inode)
 
 struct ovl_dir_cache *ovl_dir_cache(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
-
-	return oe->cache;
+	return OVL_I(d_inode(dentry))->cache;
 }
 
 void ovl_set_dir_cache(struct dentry *dentry, struct ovl_dir_cache *cache)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
-
-	oe->cache = cache;
+	OVL_I(d_inode(dentry))->cache = cache;
 }
 
 bool ovl_dentry_is_opaque(struct dentry *dentry)
@@ -242,18 +238,18 @@ void ovl_inode_update(struct inode *inode, struct dentry *upperdentry)
 
 void ovl_dentry_version_inc(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct inode *inode = d_inode(dentry);
 
-	WARN_ON(!inode_is_locked(dentry->d_inode));
-	oe->version++;
+	WARN_ON(!inode_is_locked(inode));
+	OVL_I(inode)->version++;
 }
 
 u64 ovl_dentry_version_get(struct dentry *dentry)
 {
-	struct ovl_entry *oe = dentry->d_fsdata;
+	struct inode *inode = d_inode(dentry);
 
-	WARN_ON(!inode_is_locked(dentry->d_inode));
-	return oe->version;
+	WARN_ON(!inode_is_locked(inode));
+	return OVL_I(inode)->version;
 }
 
 bool ovl_is_whiteout(struct dentry *dentry)