[Bug 223275] zfsloader fails to see datasets

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223275

            Bug ID: 223275
           Summary: zfsloader fails to see datasets
           Product: Base System
           Version: 11.1-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: bergerkos at yahoo.co.uk

I have ZFS on raw disk (full-disk ZFS). My ZFS has the structure of type
$zpool/ROOT/$datasets, and zfsloader resides in
mypool/ROOT/freebsd-root/@/boot/. In this configuration zfsloader is only  able
to report the "device" zfs:mypool.

Any of the commands lszfs aren't able to go beyond that, they return error
"wrong number of arguments". I've tried all variations of:
lszfs -v zfs:mypool/ROOT:
lszfs -v zfs:mypool/ROOT/freebsd-root:

and all such. The same result.
It must be added that zfsloader is loaded via GRUB:
kfreebsd /mypool/ROOT/freebsd-root/@/boot/zfsloader

When loaded zfsloader doesn't even have $currdev set, it only has zfs_root set
to zfs:mypool (that's the name of my zpool), but can't go any further. It must
be added that with the previous versions of zfsloader it WAS possible to change
$currdev and set it to the needed dataset etc.

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