linux-kernel - Re: [SCSI] fix media change events for polled devices

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Date:	Fri, 21 Mar 2008 21:57:20 +0100
From:	Kay Sievers <kay.sievers@...y.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-scsi@...r.kernel.org
Subject: Re: [SCSI] fix media change events for polled devices

On Fri, 2008-03-21 at 16:42 -0400, Jeff Garzik wrote:
> Kay Sievers wrote:
> > On Fri, 2008-03-21 at 13:12 -0400, Jeff Garzik wrote:
> >> Linux Kernel Mailing List wrote:


> >> When 285e9670 was updated for the scsi_evt_* interface, it should have 
> >> initialized the supported_events mask.
> >>
> >> And that is the fix -- initialize supported_events according to sr/sd's 
> >> needs, and revert this change (4d1566ed2100d074ccc654e5cf2e44cdea3a01d0) 
> >> as obviously broken.
> > 
> > You mean adding a new flag? As every device will "support" these events.
> 
> Does every device attached to every controller wish to fire these events?
> 
> If so, then that wants new flag, yes.

Yes, a new flag sounds good. Every device that detects a media change
should send such event, so userspace can possibly update it's
representation of the volume.
That way, userspace can switch to a single generic event, regardless if
the device is periodically polled, or supports AN.

Thanks,
Kay

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