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    From
    SubjectRe: klibc
    Date
    Followup to:  <bda6d13a0606091528h4e85265du8651818c73827b7d@mail.gmail.com>
    By author: "Joshua Hudson" <joshudson@gmail.com>
    In newsgroup: linux.dev.kernel
    >
    > Once again. Loopback mount requires a clean unmount of root and
    > host filesystem. After remounting root read-only, host is still read-write
    > and cannot be remounted read-only.
    >
    > It is necessary to provide access to the rootfs tree somewhere else
    > or use pivot_root, like the initrd solution below:
    >
    > initrd: /linuxrc
    > #!/bin/sh
    > mount /dev/hda1 -o rw -t ntfs /host
    > mount /host/linux/root.img -o loop,ro -t ext3 /root
    > pivot_root /root /root/initrd
    > exec /initrd/bin/init
    >
    > root:/etc/rc.d/rc.halt:
    > #!/bin/sh
    > pivot_root /initrd /initrd/root
    > cd /
    > exec /stop $RUNLEVEL
    >
    > initrd:/stop
    > #!/bin/sh
    > kill -SIGUSR1 1
    > umount /root
    > umount /host
    > case $1 in
    > 0) poweroff -f ;;
    > *) reboot -f ;;
    > esac
    >
    > This requires static binaries of init, sh, mount, umount, an extant /etc, and a
    > few nodes in /dev.

    Another solution is to leave a process with its cwd parked in the
    rootfs. Look at run_linuxrc() in usr/kinit/initrd.c of any klibc tree
    to see how this can be used. (That is there to support old-style
    /linuxrc, but should be applicable here, too.)

    -hpa
    -
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