8.82. E2fsprogs-1.47.4

#### Linux From Scratch - Version r13.0-174-systemd

### Chapter 8. Installing Basic System Software

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# 8.82. E2fsprogs-1.47.4

The E2fsprogs package contains the utilities for handling the `ext2` file system. It also supports the `ext3` and `ext4` journaling file systems.

Approximate build time: 2.4 SBU on a spinning disk, 0.4 SBU on an SSD
Required disk space: 100 MB

## 8.82.1. Installation of E2fsprogs

The E2fsprogs documentation recommends that the package be built in a subdirectory of the source tree:

    mkdir -v build
    cd       build

Prepare E2fsprogs for compilation:

    ../configure --prefix=/usr       \
                 --sysconfdir=/etc   \
                 --enable-elf-shlibs \
                 --disable-libblkid  \
                 --disable-libuuid   \
                 --disable-uuidd     \
                 --disable-fsck

The meaning of the configure options:

`--enable-elf-shlibs`

  This creates the shared libraries which some programs in this package use.

`--disable-*`

  These prevent building and installing the `libuuid` and `libblkid` libraries, the `uuidd` daemon, and the fsck wrapper; util-linux installs more recent versions.

Compile the package:

    make

To run the tests, issue:

    make check

One test named `m_assume_storage_prezeroed` is known to fail. Another test named `m_rootdir_acl` is known to fail if the file system used for the LFS system is not `ext4`.

Install the package:

    make install

Remove useless static libraries:

    rm -fv /usr/lib/{libcom_err,libe2p,libext2fs,libss}.a

This package installs a gzipped `.info` file but doesn't update the system-wide `dir` file. Unzip this file and then update the system `dir` file using the following commands:

    gunzip -v /usr/share/info/libext2fs.info.gz
    install-info --dir-file=/usr/share/info/dir /usr/share/info/libext2fs.info

If desired, create and install some additional documentation by issuing the following commands:

    makeinfo -o      doc/com_err.info ../lib/et/com_err.texinfo
    install -v -m644 doc/com_err.info /usr/share/info
    install-info --dir-file=/usr/share/info/dir /usr/share/info/com_err.info

## 8.82.2. Configuring E2fsprogs

`/etc/mke2fs.conf` contains the default value of various command line options of mke2fs. You may edit the file to make the default values suitable for your needs. For example, some utilities (not in LFS or BLFS) cannot recognize a `ext4` file system with `metadata_csum_seed` feature enabled. If you need such a utility, you may remove the feature from the default `ext4` feature list with the command:

    sed 's/metadata_csum_seed,//' -i /etc/mke2fs.conf

Read the man page mke2fs.conf(5) for details.

## 8.82.3. Contents of E2fsprogs

Installed programs: badblocks, chattr, compile_et, debugfs, dumpe2fs, e2freefrag, e2fsck, e2image, e2label, e2mmpstatus, e2scrub, e2scrub_all, e2undo, e4crypt, e4defrag, filefrag, fsck.ext2, fsck.ext3, fsck.ext4, logsave, lsattr, mk_cmds, mke2fs, mkfs.ext2, mkfs.ext3, mkfs.ext4, mklost+found, resize2fs, and tune2fs
Installed libraries: libcom_err.so, libe2p.so, libext2fs.so, and libss.so
Installed directories: /usr/include/e2p, /usr/include/et, /usr/include/ext2fs, /usr/include/ss, /usr/lib/e2fsprogs, /usr/share/et, and /usr/share/ss

### Short Descriptions

badblocks | Searches a device (usually a disk partition) for bad blocks
chattr | Changes the attributes of files on `ext{234}` file systems
compile_et | An error table compiler; it converts a table of error-code names and messages into a C source file suitable for use with the `com_err` library
debugfs | A file system debugger; it can be used to examine and change the state of `ext{234}` file systems
dumpe2fs | Prints the super block and blocks group information for the file system present on a given device
e2freefrag | Reports free space fragmentation information
e2fsck | Is used to check and optionally repair `ext{234}` file systems
e2image | Is used to save critical `ext{234}` file system data to a file
e2label | Displays or changes the file system label on the `ext{234}` file system on a given device
e2mmpstatus | Checks MMP (Multiple Mount Protection) status of an `ext4` file system
e2scrub | Checks the contents of a mounted `ext{234}` file system
e2scrub_all | Checks all mounted `ext{234}` file systems for errors
e2undo | Replays the undo log for an `ext{234}` file system found on a device. [This can be used to undo a failed operation by an E2fsprogs program.]
e4crypt | `Ext4` file system encryption utility
e4defrag | Online defragmenter for `ext4` file systems
filefrag | Reports on how badly fragmented a particular file might be
fsck.ext2 | By default checks `ext2` file systems and is a hard link to e2fsck
fsck.ext3 | By default checks `ext3` file systems and is a hard link to e2fsck
fsck.ext4 | By default checks `ext4` file systems and is a hard link to e2fsck
logsave | Saves the output of a command in a log file
lsattr | Lists the attributes of files on a second extended file system
mk_cmds | Converts a table of command names and help messages into a C source file suitable for use with the `libss` subsystem library
mke2fs | Creates an `ext{234}` file system on the given device
mkfs.ext2 | By default creates `ext2` file systems and is a hard link to mke2fs
mkfs.ext3 | By default creates `ext3` file systems and is a hard link to mke2fs
mkfs.ext4 | By default creates `ext4` file systems and is a hard link to mke2fs
mklost+found | Creates a `lost+found` directory on an `ext{234}` file system; it pre-allocates disk blocks to this directory to lighten the task of e2fsck
resize2fs | Can be used to enlarge or shrink `ext{234}` file systems
tune2fs | Adjusts tunable file system parameters on `ext{234}` file systems
`libcom_err` | The common error display routine
`libe2p` | Used by dumpe2fs, chattr, and lsattr
`libext2fs` | Contains routines to enable user-level programs to manipulate `ext{234}` file systems
`libss` | Used by debugfs

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