mod-sysfs-netns

Sample kobject usage with net namespaces. Based on fs/nfs/sysfs.c and samples/kobject/kobject-example.c.

About module

This module shows how to create a simple subdirectory in sysfs called /sys/kernel/kset_sysfs_netns/net/data with file property in this directory where we can read & write integers with following commands:

# to read property
cat /sys/kernel/kset_sysfs_netns/net/data/property

# to write property
echo 1 > /sys/kernel/kset_sysfs_netns/net/data/property

Building & using module

Using make

# build
make KSRC=/lib/modules/$(uname -r)/build

# load module
insmod mod-sysfs-netns.ko

# unload module
rmmod mod-sysfs-netns.ko

# clean up
make KSRC=/lib/modules/$(uname -r)/build clean

Using DKMS

cd mod-sysfs-netns

# add module source to /usr/src tree
dkms add $(pwd)

# build & install module to /lib/modules/$(uname -r) tree
dkms install mod-sysfs-netns/1.0

# load module
modprobe -v mod-sysfs-netns

# unload module
rmmod mod-sysfs-netns

# remove it from DKMS tree
dkms remove mod-sysfs-netns/1.0 --all