Re: [dm-devel] help:"event number"

[tom z <maillist tom gmail com>]

Thanks,i got it.
But i have another question.Sometimes, i can't remove the device, in the "dmsetup man", it said "because an
uninterruptible process is waiting for I/O to return from it", and what should i do for getting the PID or something about this "uninterruptible process"? I know adding "--force" can help me remove the device, but i am worried about this action will cause I/O broken.

On Mon, Jan 17, 2011 at 11:29 AM, Alasdair G Kergon <agk redhat com> wrote:

On Mon, Jan 17, 2011 at 10:12:51AM +0800, tom z wrote:
>    What's the meaning of the "Event number". Is it number of the device's
> I/O event? If the number is greater to zero, it means the I/O request's
> happening?

No.  Just means something happened that userspace ought to know about,
like a path failing.  Used by 'wait' - see 'man dmsetup' and
http://people.redhat.com/agk/talks/FOSDEM_2005/text51.html .

Alasdair