FS kernel dev setup

Building

After cloning repository with all submodules run:

1. make linux - compile linux kernel
2. make buildroot - compile buildroot and build rootfs with rootfs-overlay
3. make vm-debug - launch qemu with modified NILFS kernel module and modified nilfs-utils.

Usage

Makefile commands:

• make linux - compile linux kernel
• make buildroot - compile buildroot and build rootfs with rootfs-overlay
• make vm-debug - launch qemu with kernel debug support
• make gdb-debug - launch gdb with presseding in gdb/gdbcmd

Debugging

In one terminal: make vm-debug

In the second one: make gdb-debug

Then set breakpoint in gdb, for ex. b ext2_fill_super and input continue

Development

Launch qemu with: make vm-debug

After each change in kernel code run make linux

Kernel stacktrace

There is a usefull utility: workflow/linux/scripts/decode_stacktrace.sh which allows to decode generated kernel stacktrace. It can be invoked by:

sh scripts/decode_stacktrace.sh vmlinux < stacktrace.log

where stacktrace.log is file with copied stacktrace content.

Buildroot and kernel configuration

If any configuration changed, remember to replace ./.config-* files with changed ones.