The Design and Implementation of the Anykernel and Rump Kernels

B–8
Our goal is to add another partition after the existing ones to contain the cgdencrypted
data. This will require extending the file containing the image, and,
naturally, a large enough USB mass storage device onto which the new image file
can be copied.
First, we create a file system image out of our data directory using the standard
makefs command from the NetBSD base system:
golem> makefs unencrypted.ffs preciousdir
Calculated size of ‘unencrypted.ffs’: 12812288 bytes, 696 inodes
Extent size set to 8192
unencrypted.ffs: 12.2MB (25024 sectors) block size 8192, fragment size 1024
using 1 cylinder groups of 12.22MB, 1564 blks, 768 inodes.
super-block backups (for fsck -b #) at:
32,
Populating ‘unencrypted.ffs’
Image ‘unencrypted.ffs’ complete
Then, we calculate the image size in disk sectors by dividing the image size with the
disk sector size (512 bytes):
golem> expr ‘stat -f %z unencrypted.ffs‘ / 512
25024
We then edit the existing image label so that there is a spare partition large enough
to hold the image. We need to edit ”total sectors”, and the ”c” and ”d” partition.
We also need to create the ”e” partition. Make sure you use ”unknown” instead of
”unused” as the fstype for for partition e. In the following image the edited fields
are denotated with a red color.