Now that a blank partition has been set up, the file system can be created. The most widely-used system in the Linux world is the second extended file system (ext2), but with newer high-capacity hard disks, journaling file systems are becoming increasingly popular. We will create an ext2 file system. Build instructions for other file systems can be found at http://www.linuxfromscratch.org/blfs/view/svn/postlfs/filesystems.html.
To create an ext2 file system on the LFS partition, run the following:
mke2fs -v /dev/[xxx]
Replace [xxx] with the name of the LFS partition (hda5 in our previous example).
Some host distributions use custom features in their filesystem creation tools (e2fsprogs). This can cause problems when booting into your new LFS in Chapter 9, as those features will not be supported by the LFS-installed e2fsprogs; you will get an error similar to “unsupported filesystem features, upgrade your e2fsprogs”. To check if your host system uses custom enhancements, run the following command:
debugfs -R feature /dev/[xxx]
If the output contains features other than: dir_index; filetype; large_file; resize_inode or sparse_super then your host system may have custom enhancements. In that case, to avoid later problems, you should compile the stock e2fsprogs package and use the resulting binaries to re-create the filesystem on your LFS partition:
cd /tmp tar -xjvf /path/to/sources/e2fsprogs-1.37.tar.bz2 cd e2fsprogs-1.37 mkdir -v build cd build ../configure make #note that we intentionally don't 'make install' here! ./misc/mke2fs -v /dev/[xxx] cd /tmp rm -rfv e2fsprogs-1.37
If a swap partition was created, it will need to be initialized for use by issuing the command below. If you are using an existing swap partition, there is no need to format it.
mkswap -v /dev/[yyy]
Replace [yyy] with the name of the swap partition.