f2fs: clean up data_blkaddr() and get_dnode_addr()

Introudce a new help get_dnode_base() to wrap common code from
get_dnode_addr() and data_blkaddr() for cleanup.
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -2900,26 +2900,27 @@ static inline __le32 *blkaddr_in_node(struct f2fs_node *node)
 }
 
 static inline int f2fs_has_extra_attr(struct inode *inode);
-static inline block_t data_blkaddr(struct inode *inode,
-			struct page *node_page, unsigned int offset)
+static inline unsigned int get_dnode_base(struct inode *inode,
+					struct page *node_page)
 {
-	struct f2fs_node *raw_node;
-	__le32 *addr_array;
-	int base = 0;
-	bool is_inode = IS_INODE(node_page);
+	if (!IS_INODE(node_page))
+		return 0;
 
-	raw_node = F2FS_NODE(node_page);
+	return inode ? get_extra_isize(inode) :
+			offset_in_addr(&F2FS_NODE(node_page)->i);
+}
 
-	if (is_inode) {
-		if (!inode)
-			/* from GC path only */
-			base = offset_in_addr(&raw_node->i);
-		else if (f2fs_has_extra_attr(inode))
-			base = get_extra_isize(inode);
-	}
+static inline __le32 *get_dnode_addr(struct inode *inode,
+					struct page *node_page)
+{
+	return blkaddr_in_node(F2FS_NODE(node_page)) +
+			get_dnode_base(inode, node_page);
+}
 
-	addr_array = blkaddr_in_node(raw_node);
-	return le32_to_cpu(addr_array[base + offset]);
+static inline block_t data_blkaddr(struct inode *inode,
+			struct page *node_page, unsigned int offset)
+{
+	return le32_to_cpu(*(get_dnode_addr(inode, node_page) + offset));
 }
 
 static inline block_t f2fs_data_blkaddr(struct dnode_of_data *dn)
@@ -3292,8 +3293,6 @@ static inline bool f2fs_is_cow_file(struct inode *inode)
 	return is_inode_flag_set(inode, FI_COW_FILE);
 }
 
-static inline __le32 *get_dnode_addr(struct inode *inode,
-					struct page *node_page);
 static inline void *inline_data_addr(struct inode *inode, struct page *page)
 {
 	__le32 *addr = get_dnode_addr(inode, page);
@@ -3432,17 +3431,6 @@ static inline int get_inline_xattr_addrs(struct inode *inode)
 	return F2FS_I(inode)->i_inline_xattr_size;
 }
 
-static inline __le32 *get_dnode_addr(struct inode *inode,
-					struct page *node_page)
-{
-	int base = 0;
-
-	if (IS_INODE(node_page) && f2fs_has_extra_attr(inode))
-		base = get_extra_isize(inode);
-
-	return blkaddr_in_node(F2FS_NODE(node_page)) + base;
-}
-
 #define f2fs_get_inode_mode(i) \
 	((is_inode_flag_set(i, FI_ACL_MODE)) ? \
 	 (F2FS_I(i)->i_acl_mode) : ((i)->i_mode))