PATCH: teach (gpt)zfsboot, zfsloader to discern vdev status correctly

[Matt Reimer]

Instead of assuming all vdevs are healthy, check the newest vdev label
for each vdev's status. Booting from a degraded vdev should now be
more robust.

Sponsored by: VPOP Technologies, Inc.

Matt Reimer

(Note that much of this patch is merely whitespace change due to a
block needing to be reindented. I've attached
correct-status-nowhitespace.patch to make review easier.)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: correct-status.patch
Type: application/octet-stream
Size: 7999 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-fs/attachments/20091214/4d646175/correct-status.obj
-------------- next part --------------
A non-text attachment was scrubbed...
Name: correct-status-nowhitespace.patch
Type: application/octet-stream
Size: 4776 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-fs/attachments/20091214/4d646175/correct-status-nowhitespace.obj