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    SubjectRe: [Rdi1] Re: [PATCH] Add MOUNT_STATUS ioctl to cdrom device
    Christoph Hellwig wrote:
    > On Tue, Aug 26, 2003 at 06:30:10PM +0700, Samphan Raruenrom wrote:
    >>>>This doesn't make sense at all. Just try the unmount and
    >>>>tell the user if it failed - you can't say whether it will
    >>>>fail before trying.
    >>Yes, you can! Reading the code, if vfsmount.mnt_count > 1 then
    >>umount on that device will fail.
    > if you are doing the unmount currently and nothing changes because
    > you hold the nessecary locks, yes. But as soon as you drop the locks
    > this is void. There's no way to find out whether you can unmount
    > a filesystem except trying it.

    _^_ I understand it now. Thank you for your patience in explaining this
    to me. I learn quite a lot of things in <4 hours! Thank you everyone.
    I'll try to make a good use of what I learn here, e.g. to write another
    GNOME automounter that use the new "event status notification" and also
    let users eject their CDs -
    "without polling" - possible?
    It must be real cool to write such daemon (polling make any hacker feel guilty).

    --
    Samphan Raruenrom,
    The Open Source Project,
    National Electronics and Computer Technology Center,
    National Science and Technology Development Agency,
    Thailand.

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