MFC r269086:

As of r268075, the responsibility of rounding up buffer to optimal size have
been transferred from zio_compress_data to its caller.  Therefore, passing
the 'minblocksize' down will be a no-op.

Eliminate the parameter to reduce diff against upstream.
MFC r269093:

Transform the I/O when vdev_physical_ashift is greater than
SPA_MINBLOCKSHIFT.
MFC the cddl/contrib/opensolaris/cmd/zpool portion of r267803 (joel):

mdoc: remove superfluous paragraph macros.
MFC r268621 (smh) + r268625:

Don't report non-native block-size pools under zpool status -x

zpool status -x is used to identify pools that are exhibiting
errors or are otherwise unavailable, therefore non-native
block-size pools shouldn't be reported.

Also update man page to clarify other additional conditions
which won't cause a pool to be displayed under zpool status -x.

Sponsored by:   Multiplay
MFC r269100:

Diff reduction against Illumos.