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    Subject2.4.22-pre4: devfs on initrd stays busy after pivot_root
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    Hi!

    Marcelo Tosatti wrote:
    > Hi,
    >
    > Here goes -pre4. It contains a lot of updates and fixes.
    >
    > We decided to include this new code quota code which allows usage of
    > quotas with 32bit UID/GIDs.
    >
    > Most Toshibas should work now due to an important ACPI fix.
    >
    > Please help and test.
    >
    Beginning with 2.4.22-pre4 I can't unmount devfs on my
    initial ramdisk anymore because of EBUSY

    I use initrd and let the kernel mount devfs on /dev on boot.
    I then set up all the drivers needed to mount the real root
    device, do a "pivot_root" and continue with /sbin/init,
    just like it is described in Documentation/initrd.txt

    When the boot process is finished, filesystems are mounted as
    follows:

    root@install:~ {520} $ mount
    rootfs on / type rootfs (rw)
    /dev/root on /initrd type romfs (ro)
    none on /initrd/dev type devfs (rw)
    /dev/ide/host0/bus0/target0/lun0/part3 on / type ext2 (rw)
    devfs on /dev type devfs (rw)
    proc on /proc type proc (rw)

    I then want to get rid of everything mounted under /initrd

    root@install:~ {521} $ umount /initrd/dev
    umount: /initrd/dev: device is busy

    This used to work just fine with 2.4.21 and 2.4.22-pre[123]

    It does not work with 2.4.22-pre4 and 2.4.22-pre8
    Also, with linux-2.4.21-ac4 unmounting /initrd/dev
    does not work.

    I made a diff between pre3 and pre4 and some changes in
    fs/exec.c, fs/binfmt_elf.c and kernel/fork.c (around new
    function "unshare_files()") look suspicious to me. I find
    these changes in both 2.4.21-ac4 and 2.4.22-pre4 patchset
    (but I'm not a kernel hacker, so I might be wrong)

    Any idea anyone?

    - - andreas

    - --
    Andreas Haumer | mailto:andreas@xss.co.at
    *x Software + Systeme | http://www.xss.co.at/
    Karmarschgasse 51/2/20 | Tel: +43-1-6060114-0
    A-1100 Vienna, Austria | Fax: +43-1-6060114-71
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