K 10
svn:author
V 7
delphij
K 8
svn:date
V 27
2015-01-23T00:44:14.816486Z
K 7
svn:log
V 492
MFC r275594: MFV r275540:

When importing a pool, don't assume that the passed pool configuration
at vdev_load is always vaild.  It's possible that a stale configuration
that comes with extra vdevs, where metaslab_init() would fail because
of lower layer returns error.

Change the code to make metaslab_init() handle and return errors from
lower layer and pass it back to upper layer and handle it there.

Illumos issue:
    5213 panic in metaslab_init due to space_map_open returning ENXIO

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