Misschien nog even wat info over journal. Het is verborgen en niet enorm groot. En volgens mij heeft de reserved journal inode en de reserved blocks. Anders zou het toch vermeld staan in de man pagina bij reserved blocks.
-j Add an ext3 journal to the filesystem. If the -J option is not
specified, the default journal parameters will be used to create
an appropriately sized journal (given the size of the filesys�
tem) stored within the filesystem. Note that you must be using
a kernel which has ext3 support in order to actually make use of
the journal.
If this option is used to create a journal on a mounted filesys�
tem, an immutable file, .journal, will be created in the top-
level directory of the filesystem, as it is the only safe way to
create the journal inode while the filesystem is mounted. While
the ext3 journal is visible, it is not safe to delete it, or
modify it while the filesystem is mounted; for this reason the
file is marked immutable. While checking unmounted filesystems,
e2fsck(8) will automatically move .journal files to the invisi�
ble, reserved journal inode. For all filesystems except for the
root filesystem, this should happen automatically and naturally
during the next reboot cycle. Since the root filesystem is
mounted read-only, e2fsck(8) must be run from a rescue floppy in
order to effect this transition.
On some distributions, such as Debian, if an initial ramdisk is
used, the initrd scripts will automatically convert an ext2 root
filesystem to ext3 if the /etc/fstab file specifies the ext3
filesystem for the root filesystem in order to avoid requiring
the use of a rescue floppy to add an ext3 journal to the root
filesystem.
-J journal-options
Override the default ext3 journal parameters. Journal options
are comma separated, and may take an argument using the equals
(’=’) sign. The following journal options are supported:
size=journal-size
Create a journal stored in the filesystem of size
journal-size megabytes. The size of the journal
must be at least 1024 filesystem blocks (i.e., 1MB
if using 1k blocks, 4MB if using 4k blocks, etc.)
and may be no more than 102,400 filesystem blocks.
There must be enough free space in the filesystem to
create a journal of that size.