Re: [Rdi1] Re: [PATCH] Add MOUNT_STATUS ioctl to cdrom device

[Samphan Raruenrom <samphan@nectec.or.th>]

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.