be_unmount_pool
err = be_unmount_pool(zhp, tmp_mntpnt, orig_mntpnt);
iret = be_unmount_pool(pool_zhp, ptmp_mntpnt, orig_mntpnt);
err = be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
err = be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
err = be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
err = be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
(void) be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
err = be_unmount_pool(zhp, ptmp_mntpnt, orig_mntpnt);
int be_unmount_pool(zfs_handle_t *, char *, char *);