vdev_geom.c currently uses the g_consumer's private field to point to a
vdev_t. That way, a GEOM event can cause a change to a ZFS vdev. For
example, when you remove a disk, the vdev's status will change to REMOVED.
However, vdev_geom will sometimes attach multiple vdevs to the same GEOM
consumer. If this happens, then geom events will only be propagated to one
of the vdevs.
Fix this by storing a linked list of vdevs in g_consumer's private field.
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_geom.c
* g_consumer.private now stores a linked list of vdev pointers associated
with the consumer instead of just a single vdev pointer.
* Change vdev_geom_set_physpath's signature to more closely match
vdev_geom_set_rotation_rate
* Don't bother calling g_access in vdev_geom_set_physpath. It's guaranteed
that we've already accessed the consumer by the time we get here.
* Don't call vdev_geom_set_physpath in vdev_geom_attach. Instead, call it
in vdev_geom_open, after we know that the open has succeeded.
PR: 218634
Reviewed by: gibbs
MFC after: 1 week
Sponsored by: Spectra Logic Corp
Differential Revision: https://reviews.freebsd.org/D10391
7ac72c256f