K 10
svn:author
V 5
gibbs
K 8
svn:date
V 27
2011-08-16T22:20:45.272103Z
K 7
svn:log
V 1088
Close several race conditions in the ZFS vdev geom module, most triggered
by concurrent ZFS reprobe and GEOM orphan processing.

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c:
	o Make vdev_geom_close() synchronous instead of deferring
	  its work to a GEOM event handler.  This prevents a future
	  open call from referencing a consumer that is scheduled for
	  destruction.
	o Move initialization of the consumer private pointer (which
	  references the ZFS vdev object using this consumer) into
	  vdev_geom_attach().  This guarantees that an orphan event
	  received during the small windows where the topology lock
	  is dropped in open processing, is effective in marking a
	  vdev as needing to be removed.
	o Move clearing of the consumer private pointer from
	  vdev_geom_close() into vdev_geom_detach().  When
	  vdev_geom_open() fails, vdev_geom_detach is called directly,
	  which used to bypass this necessary step.
	o Modify vdev_geom_orphan handler to ignore a consumer that
	  that is no longer associated with a vdev.

Sponsored by:	Spectra Logic Corporation

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