Here is HOWTO add nethostfs on Western Digital My Book World Edition. For Chinese version, visit here（中文版）.

Prerequisite: Enable SSH on My Book.

Step 1. Download nethostfs v1.5 source code, unpack and compile.

bash
  1. wget http://www.snailium.net/mbwe/nethostfs15src.tar.gz
  2. tar -xzvf nethostfs15src.tar.gz
  3. cd nethostfs15src
  4. make
  5. cp nethostfs /usr/sbin
  6. chmod 755 /usr/sbin/nethostfs
  7. chown root:root /usr/sbin/nethostfs

Step 2. Create shared folder /PSP/ through My Book Storage Manager.

Step 3. Create service script nethostfs under /etc/init.d/.

/etc/init.d/nethostfs
  1. #!/bin/sh
  2. #
  3. # Starts or stops the nethostfs for remote PSP access.
  4.  
  5. PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin
  6. NAME="nethostfs"
  7. DESC="Remote PSP access"
  8.  
  9. case "$1" in
  10.   start)
  11.         echo -n "Starting $DESC: $NAME"
  12.         nice -n 10 nethostfs /shares/internal/PSP &
  13.         echo "..."
  14.         ;;
  15.    stop)
  16.         echo -n "Stopping $DESC: $NAME"
  17.         killall nethostfs
  18.         echo "."
  19.         ;;
  20.    *)
  21.         N=/etc/init.d/$NAME
  22.         echo "Usage: $N {start|stop}" >&2
  23.         exit 2
  24. esac
  25.  
  26. exit 0
  27.  

Step 4. Make start/stop link under /etc/init.d/.

bash
  1. cd /etc/init.d/
  2. ln -s /etc/init.d/nethostfs S91nethostfs
  3. ln -s /etc/init.d/nethostfs K09nethostfs

Step 5. Reboot My Book World Edition

Note 1 - nice -n 10 is used in service script to adjust process priorities, in order to avoid nethostfs consumes too much CPU resource.
Note 2 - This works perfect for iRshell, as well as PPA (which uses iRshell's WiFi code)