A small example practice on ext2 file system

Reading inode content and directory entry record from a ext2 image file.

Compile

Simply run make.

Create ext2 file system image file

The target execute file need to read a file name initrd.img. You can change the file name to any. You can create a file with mke2fs:

dd if=/dev/zero of=initrd.img bs=300k count=1
mke2fs -F -m0 initrd.img

Then mount the file, do what ever you want in that mount point. Unmount, execute the target in debugger, then watch the results.

Watch the results

Execute target won't output anythings. In order to see the result, you need to use debugger with breakpoints to watch the changes of the variable d and content.

References

This code based on OSdev's Ext2 article.