f2fs: add parentheses for macro variables more

This patch adds parentheses for macro variables more in include/linux/f2fs_fs.h.
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

include/linux/f2fs_fs.h

@@ -32,9 +32,9 @@
 /* 0, 1(node nid), 2(meta nid) are reserved node id */
 #define F2FS_RESERVED_NODE_NUM		3
 
-#define F2FS_ROOT_INO(sbi)	(sbi->root_ino_num)
-#define F2FS_NODE_INO(sbi)	(sbi->node_ino_num)
-#define F2FS_META_INO(sbi)	(sbi->meta_ino_num)
+#define F2FS_ROOT_INO(sbi)	((sbi)->root_ino_num)
+#define F2FS_NODE_INO(sbi)	((sbi)->node_ino_num)
+#define F2FS_META_INO(sbi)	((sbi)->meta_ino_num)
 
 #define F2FS_IO_SIZE(sbi)	(1 << (sbi)->write_io_size_bits) /* Blocks */
 #define F2FS_IO_SIZE_KB(sbi)	(1 << ((sbi)->write_io_size_bits + 2)) /* KB */
@@ -161,7 +161,7 @@ struct f2fs_checkpoint {
  */
 #define F2FS_ORPHANS_PER_BLOCK	1020
 
-#define GET_ORPHAN_BLOCKS(n)	((n + F2FS_ORPHANS_PER_BLOCK - 1) / \
+#define GET_ORPHAN_BLOCKS(n)	(((n) + F2FS_ORPHANS_PER_BLOCK - 1) / \
 					F2FS_ORPHANS_PER_BLOCK)
 
 struct f2fs_orphan_block {
@@ -449,7 +449,7 @@ typedef __le32	f2fs_hash_t;
 #define F2FS_SLOT_LEN		8
 #define F2FS_SLOT_LEN_BITS	3
 
-#define GET_DENTRY_SLOTS(x)	((x + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
+#define GET_DENTRY_SLOTS(x) (((x) + F2FS_SLOT_LEN - 1) >> F2FS_SLOT_LEN_BITS)
 
 /* MAX level for dir lookup */
 #define MAX_DIR_HASH_DEPTH	63