f2fs: introduce help macro ADDRS_PER_PAGE()

Introduce help macro ADDRS_PER_PAGE() to get the number of address pointers in
direct node or inode.
Signed-off-by: NChao Yu <chao2.yu@samsung.com>
Signed-off-by: NJaegeuk Kim <jaegeuk.kim@samsung.com>

fs/f2fs/data.c

@@ -652,8 +652,7 @@ static int get_data_block(struct inode *inode, sector_t iblock,
 		goto put_out;
 	}
 
-	end_offset = IS_INODE(dn.node_page) ?
-			ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK;
+	end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 	bh_result->b_size = (((size_t)1) << blkbits);
 	dn.ofs_in_node++;
 	pgofs++;
@@ -675,8 +674,7 @@ static int get_data_block(struct inode *inode, sector_t iblock,
 		if (dn.data_blkaddr == NEW_ADDR)
 			goto put_out;
 
-		end_offset = IS_INODE(dn.node_page) ?
-			ADDRS_PER_INODE(F2FS_I(inode)) : ADDRS_PER_BLOCK;
+		end_offset = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 	}
 
 	if (maxblocks > (bh_result->b_size >> blkbits)) {

fs/f2fs/file.c

@@ -288,10 +288,7 @@ int truncate_blocks(struct inode *inode, u64 from)
 		return err;
 	}
 
-	if (IS_INODE(dn.node_page))
-		count = ADDRS_PER_INODE(F2FS_I(inode));
-	else
-		count = ADDRS_PER_BLOCK;
+	count = ADDRS_PER_PAGE(dn.node_page, F2FS_I(inode));
 
 	count -= dn.ofs_in_node;
 	f2fs_bug_on(count < 0);

fs/f2fs/recovery.c

@@ -301,10 +301,7 @@ static int do_recover_data(struct f2fs_sb_info *sbi, struct inode *inode,
 		goto out;
 
 	start = start_bidx_of_node(ofs_of_node(page), fi);
-	if (IS_INODE(page))
-		end = start + ADDRS_PER_INODE(fi);
-	else
-		end = start + ADDRS_PER_BLOCK;
+	end = start + ADDRS_PER_PAGE(page, fi);
 
 	f2fs_lock_op(sbi);
 

include/linux/f2fs_fs.h

@@ -146,6 +146,9 @@ struct f2fs_extent {
 #define ADDRS_PER_BLOCK		1018	/* Address Pointers in a Direct Block */
 #define NIDS_PER_BLOCK		1018	/* Node IDs in an Indirect Block */
 
+#define ADDRS_PER_PAGE(page, fi)	\
+	(IS_INODE(page) ? ADDRS_PER_INODE(fi) : ADDRS_PER_BLOCK)
+
 #define	NODE_DIR1_BLOCK		(DEF_ADDRS_PER_INODE + 1)
 #define	NODE_DIR2_BLOCK		(DEF_ADDRS_PER_INODE + 2)
 #define	NODE_IND1_BLOCK		(DEF_ADDRS_PER_INODE + 3)