HelenOS sources

EXT4_EXTENT_MAGIC  827 uspace/lib/ext4/src/extent.c 			ext4_extent_header_set_magic(path_ptr->header, EXT4_EXTENT_MAGIC);
EXT4_EXTENT_MAGIC 1285 uspace/lib/ext4/src/filesystem.c 		ext4_extent_header_set_magic(header, EXT4_EXTENT_MAGIC);