when to remount sysfs ?

[Karel Zak]

On Mon, May 06, 2013 at 12:31:17AM +0800, ishare wrote:
>  Hi:
>    
>    As i know , when kernel is  booting , sysfs is mounted at /sys before the real root fs is mounted .
>   
>    Then , after the real root fs is mounted , when does i need to remount sysfs at the new /sys location ?
>   
>    I know the devfs is remounted by do_mount ("none", "/dev", "devfs", 0, "") , so how is that for sysfs?

 It depends on initramfs, for example switch_root(8) command from
 util-linux or "systemctl switch-root" (systemd reimplementation)
 moves /dev, /proc, /sys and /run to the new root by MS_MOVE mount(2)
 operation.

    Karel

-- 
 Karel Zak  <kzak at redhat.com>
 http://karelzak.blogspot.com