diff --git a/common/extent-tree-utils.c b/common/extent-tree-utils.c
index 34c7e5095160..2ccac6b44cea 100644
--- a/common/extent-tree-utils.c
+++ b/common/extent-tree-utils.c
@@ -122,7 +122,7 @@ static int __btrfs_record_file_extent(struct btrfs_trans_handle *trans,
 				      struct btrfs_root *root, u64 objectid,
 				      struct btrfs_inode_item *inode,
 				      u64 file_pos, u64 disk_bytenr,
-				      u64 *ret_num_bytes)
+				      u64 *ret_num_bytes, bool prealloc)
 {
 	int ret;
 	struct btrfs_fs_info *info = root->fs_info;
@@ -229,7 +229,10 @@ static int __btrfs_record_file_extent(struct btrfs_trans_handle *trans,
 	leaf = path->nodes[0];
 	fi = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_file_extent_item);
 	btrfs_set_file_extent_generation(leaf, fi, trans->transid);
-	btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
+	if (prealloc)
+		btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_PREALLOC);
+	else
+		btrfs_set_file_extent_type(leaf, fi, BTRFS_FILE_EXTENT_REG);
 	btrfs_set_file_extent_disk_bytenr(leaf, fi, extent_bytenr);
 	btrfs_set_file_extent_disk_num_bytes(leaf, fi, extent_num_bytes);
 	btrfs_set_file_extent_offset(leaf, fi, extent_offset);
@@ -265,7 +268,7 @@ int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root, u64 objectid,
 			     struct btrfs_inode_item *inode,
 			     u64 file_pos, u64 disk_bytenr,
-			     u64 num_bytes)
+			     u64 num_bytes, bool prealloc)
 {
 	u64 cur_disk_bytenr = disk_bytenr;
 	u64 cur_file_pos = file_pos;
@@ -276,7 +279,7 @@ int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
 		ret = __btrfs_record_file_extent(trans, root, objectid,
 						 inode, cur_file_pos,
 						 cur_disk_bytenr,
-						 &cur_num_bytes);
+						 &cur_num_bytes, prealloc);
 		if (ret < 0)
 			break;
 		cur_disk_bytenr += cur_num_bytes;
diff --git a/common/extent-tree-utils.h b/common/extent-tree-utils.h
index f03d9c438375..7abd0337ea0b 100644
--- a/common/extent-tree-utils.h
+++ b/common/extent-tree-utils.h
@@ -31,6 +31,6 @@ int btrfs_record_file_extent(struct btrfs_trans_handle *trans,
 			     struct btrfs_root *root, u64 objectid,
 			     struct btrfs_inode_item *inode,
 			     u64 file_pos, u64 disk_bytenr,
-			     u64 num_bytes);
+			     u64 num_bytes, bool prealloc);
 
 #endif
diff --git a/convert/main.c b/convert/main.c
index f18fab4a236c..d67c4e8eac25 100644
--- a/convert/main.c
+++ b/convert/main.c
@@ -337,7 +337,7 @@ static int create_image_file_range(struct btrfs_trans_handle *trans,
 		return -EINVAL;
 	}
 	ret = btrfs_record_file_extent(trans, root, ino, inode, bytenr,
-				       disk_bytenr, len);
+				       disk_bytenr, len, false);
 	if (ret < 0)
 		return ret;
 
@@ -426,7 +426,7 @@ static int migrate_one_reserved_range(struct btrfs_trans_handle *trans,
 
 		/* Now handle extent item and file extent things */
 		ret = btrfs_record_file_extent(trans, root, ino, inode, cur_off,
-					       key.objectid, key.offset);
+					       key.objectid, key.offset, false);
 		if (ret < 0)
 			break;
 		/* Finally, insert csum items */
@@ -438,7 +438,7 @@ static int migrate_one_reserved_range(struct btrfs_trans_handle *trans,
 		hole_len = cur_off - hole_start;
 		if (hole_len) {
 			ret = btrfs_record_file_extent(trans, root, ino, inode,
-					hole_start, 0, hole_len);
+					hole_start, 0, hole_len, false);
 			if (ret < 0)
 				break;
 		}
@@ -455,7 +455,8 @@ static int migrate_one_reserved_range(struct btrfs_trans_handle *trans,
 	 */
 	if (range_end(range) - hole_start > 0)
 		ret = btrfs_record_file_extent(trans, root, ino, inode,
-				hole_start, 0, range_end(range) - hole_start);
+				hole_start, 0, range_end(range) - hole_start,
+				false);
 	return ret;
 }
 
diff --git a/convert/source-fs.c b/convert/source-fs.c
index 66561438866e..9039b0e66758 100644
--- a/convert/source-fs.c
+++ b/convert/source-fs.c
@@ -262,7 +262,7 @@ int record_file_blocks(struct blk_iterate_data *data,
 	if (old_disk_bytenr == 0)
 		return btrfs_record_file_extent(data->trans, root,
 				data->objectid, data->inode, file_pos, 0,
-				num_bytes);
+				num_bytes, false);
 
 	/*
 	 * Search real disk bytenr from convert root
@@ -316,7 +316,8 @@ int record_file_blocks(struct blk_iterate_data *data,
 			      old_disk_bytenr + num_bytes) - cur_off;
 		ret = btrfs_record_file_extent(data->trans, data->root,
 					data->objectid, data->inode, file_pos,
-					real_disk_bytenr, cur_len);
+					real_disk_bytenr, cur_len,
+					false);
 		if (ret < 0)
 			break;
 		cur_off += cur_len;
diff --git a/convert/source-reiserfs.c b/convert/source-reiserfs.c
index 3edc72ed08a5..c67ade9b4c90 100644
--- a/convert/source-reiserfs.c
+++ b/convert/source-reiserfs.c
@@ -365,7 +365,7 @@ static int convert_direct(struct btrfs_trans_handle *trans,
 		return ret;
 
 	return btrfs_record_file_extent(trans, root, objectid, inode, offset,
-					key.objectid, sectorsize);
+					key.objectid, sectorsize, false);
 }
 
 static int reiserfs_convert_tail(struct btrfs_trans_handle *trans,
diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c
index 4ae9f435a7b7..cb6659319b7d 100644
--- a/mkfs/rootdir.c
+++ b/mkfs/rootdir.c
@@ -411,7 +411,8 @@ again:
 
 	if (bytes_read) {
 		ret = btrfs_record_file_extent(trans, root, objectid,
-				btrfs_inode, file_pos, first_block, cur_bytes);
+				btrfs_inode, file_pos, first_block, cur_bytes,
+				false);
 		if (ret)
 			goto end;
 
