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From: Greg KH <gregkh@linuxfoundation.org>
To: Andy Grover <agrover@redhat.com>
Cc: snitzer@redhat.com, dm-devel@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/9] Generate uevents for all DM events
Date: Tue, 4 Oct 2016 09:20:15 +0200	[thread overview]
Message-ID: <20161004072015.GA11216@kroah.com> (raw)
In-Reply-To: <1475522580-16723-1-git-send-email-agrover@redhat.com>

On Mon, Oct 03, 2016 at 12:22:51PM -0700, Andy Grover wrote:
> Hi Mike and GregKH,
> 
> I want a way to get devicemapper events without using the DM ioctl,
> because that requires creating a thread to sleep in the ioctl for each
> dm device I want events from.
> 
> It would seem like using uevents and KOBJ_CHANGE would be a good way
> to do this, but Mike said that the uevent maintainers (Greg that's
> you?) did not think this was a good idea?

KBOJ_CHANGE is a tricky one.  It has been used for a variety of
different things, but usually it is used to show that a major change has
happened with a device like a docking station plug in or out.

How often do DM events happen?  What is triggering them?  How do you
want to send them to userspace?  Through a sysfs file?  Why not just use
your own netlink connection?

thanks,

greg k-h

  parent reply	other threads:[~2016-10-04  7:48 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-03 19:22 [PATCH 0/9] Generate uevents for all DM events Andy Grover
2016-10-03 19:22 ` [PATCH 1/9] dm: Do not export dm_send_uevents Andy Grover
2016-10-03 19:22 ` [PATCH 2/9] dm: Move multipath-specific stuff out of dm-uevent.c Andy Grover
2016-10-03 19:22 ` [PATCH 3/9] dm: Inline dm_build_path_uevent into dm_path_uevent Andy Grover
2016-10-03 19:22 ` [PATCH 4/9] dm: Update dm-uevent.txt Andy Grover
2016-10-03 19:22 ` [PATCH 5/9] dm: Rename dm_build_uevent to dm_uevent_build Andy Grover
2016-10-03 19:22 ` [PATCH 6/9] dm: Rename dm_event_add to dm_event_queue Andy Grover
2016-10-03 19:22 ` [PATCH 7/9] dm: Implement dm_uevent_add() Andy Grover
2016-10-03 19:22 ` [PATCH 8/9] dm: Generate uevents for thin targets Andy Grover
2016-10-03 19:23 ` [PATCH 9/9] dm: Generate uevents for other targets Andy Grover
2016-10-03 19:29 ` [PATCH 0/9] Generate uevents for all DM events Mike Snitzer
2016-10-04  7:20 ` Greg KH [this message]
2016-10-04 23:39   ` Andy Grover
2016-10-05  0:40     ` [dm-devel] " Alasdair G Kergon
2016-10-05  6:26       ` Hannes Reinecke
2016-10-05  6:51       ` Greg KH
2016-10-05 17:06         ` Andy Grover
2016-10-05 17:43           ` Alasdair G Kergon
2016-10-05 22:30             ` Andy Grover

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