/mke2fs.conf

 1[defaults]
 2	base_features = sparse_super,filetype,resize_inode,dir_index,ext_attr
 3	blocksize = 4096
 4	inode_size = 256
 5	inode_ratio = 16384
 6
 7[fs_types]
 8	ext3 = {
 9		features = has_journal
10	}
11	ext4 = {
12		features = has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
13		inode_size = 256
14	}
15	ext4dev = {
16		features = has_journal,extent,huge_file,flex_bg,uninit_bg,dir_nlink,extra_isize
17		inode_size = 256
18		options = test_fs=1
19	}
20	small = {
21		blocksize = 1024
22		inode_size = 128
23		inode_ratio = 4096
24	}
25	floppy = {
26		blocksize = 1024
27		inode_size = 128
28		inode_ratio = 8192
29	}
30	news = {
31		inode_ratio = 4096
32	}
33	largefile = {
34		inode_ratio = 1048576
35		blocksize = -1
36	}
37	largefile4 = {
38		inode_ratio = 4194304
39		blocksize = -1
40	}
41	hurd = {
42	     blocksize = 4096
43	     inode_size = 128
44	}