On 12/06/2013 06:28 PM, Laurent Bercot wrote:
I don't know if I understand it right.
Does it mean that as long as we don't do some strange redirections of
standard IO in our initramfs, we don't need to add this option when
switching root? So in most cases we don't need to reopen the stdio,
right?
Unless your real root's /dev/console is the same file as your
initramfs's /dev/console, you probably do.
When your system boots, process 1 (and all its offspring, if there's
no redirection) has fds 0, 1 and 2 pointing to your initramfs's
/dev/console. That device will remain open as long as you don't close
those fds. switch_root needs to reopen 0, 1 and 2 to your new
/dev/console
to be able to really clean up your initramfs.
Got it.
Thanks,
Chen Qi
(The best solution is to stop using initramfs and boot directly on your
real root filesystem, using a tmpfs to perform early operations that need
writable space, and using pivot_root if you really need to change root
filesystems. initramfs is a trap.)
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