md: add support for raising dm events.
authorNeilBrown <neilb@suse.de>
Mon, 26 Jul 2010 01:49:55 +0000 (11:49 +1000)
committerNeilBrown <neilb@suse.de>
Mon, 26 Jul 2010 02:52:27 +0000 (12:52 +1000)
dm uses scheduled work to raise events to user-space.
So allow md device to have work_structs and schedule them on an error.

Signed-off-by: NeilBrown <neilb@suse.de>

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