Kyle Evans efd6500d03 libbe(3): Rewrite be_unmount to stop mucking with getmntinfo(2)
Go through the ZFS layer instead; given a BE, we can derive the dataset,
zfs_open it, then zfs_unmount. ZFS takes care of the dirty details and
likely gets it more correct than we did for more interesting setups.

MFC after:	3 days
2018-11-17 19:19:37 +00:00
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