f2fs: rename F2FS_MAP_UNWRITTEN to F2FS_MAP_DELALLOC

NEW_ADDR blocks are purely in-memory preallocated blocks, and thus
equivalent to what the core FS code calls delayed allocations, and not
unwritten extents which do have on-disk blocks allocated from which
reads always return zeroes until they are converted to written status.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/data.c

@@ -1660,9 +1660,9 @@ int f2fs_map_blocks(struct inode *inode, struct f2fs_map_blocks *map,
 		bidx = f2fs_target_device_index(sbi, blkaddr);
 
 	if (map->m_len == 0) {
-		/* preallocated unwritten block should be mapped for fiemap. */
+		/* reserved delalloc block should be mapped for fiemap. */
 		if (blkaddr == NEW_ADDR)
-			map->m_flags |= F2FS_MAP_UNWRITTEN;
+			map->m_flags |= F2FS_MAP_DELALLOC;
 		map->m_flags |= F2FS_MAP_MAPPED;
 
 		map->m_pblk = blkaddr;
@@ -1984,7 +1984,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 
 	compr_appended = false;
 	/* In a case of compressed cluster, append this to the last extent */
-	if (compr_cluster && ((map.m_flags & F2FS_MAP_UNWRITTEN) ||
+	if (compr_cluster && ((map.m_flags & F2FS_MAP_DELALLOC) ||
 			!(map.m_flags & F2FS_MAP_FLAGS))) {
 		compr_appended = true;
 		goto skip_fill;
@@ -2030,7 +2030,7 @@ int f2fs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 				compr_cluster = false;
 				size += blks_to_bytes(inode, 1);
 			}
-		} else if (map.m_flags & F2FS_MAP_UNWRITTEN) {
+		} else if (map.m_flags & F2FS_MAP_DELALLOC) {
 			flags = FIEMAP_EXTENT_UNWRITTEN;
 		}
 

fs/f2fs/f2fs.h

@@ -696,9 +696,9 @@ struct extent_tree_info {
  */
 #define F2FS_MAP_NEW		(1U << 0)
 #define F2FS_MAP_MAPPED		(1U << 1)
-#define F2FS_MAP_UNWRITTEN	(1U << 2)
+#define F2FS_MAP_DELALLOC	(1U << 2)
 #define F2FS_MAP_FLAGS		(F2FS_MAP_NEW | F2FS_MAP_MAPPED |\
-				F2FS_MAP_UNWRITTEN)
+				F2FS_MAP_DELALLOC)
 
 struct f2fs_map_blocks {
 	struct block_device *m_bdev;	/* for multi-device dio */