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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,

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