illumos gate

Picking update from OpenZFS:

commit 962d52421236fc9cd61d59b4f18cff3276077da9
Author: Tim Chase <tim@chase2k.com>
Date:   Mon Apr 21 13:22:08 2014 -0500

    Check the dataset type more rigorously when fetching properties.

    When fetching property values of snapshots, a check against the head
    dataset type must be performed.  Previously, this additional check was
    performed only when fetching "version", "normalize", "utf8only" or "case".

    This caused the ZPL properties "acltype", "exec", "devices", "nbmand",
    "setuid" and "xattr" to be erroneously displayed with meaningless values
    for snapshots of volumes.  It also did not allow for the display of
    "volsize" of a snapshot of a volume.

    This patch adds the headcheck flag paramater to zfs_prop_valid_for_type()
    and zprop_valid_for_type() to indicate the check is being done
    against a head dataset's type in order that properties valid only for
    snapshots are handled correctly.  This allows the the head check in
    get_numeric_property() to be performed when fetching a property for
    a snapshot.

    Signed-off-by: Tim Chase <tim@chase2k.com>
    Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
    Closes #2265

This is prerequisite work for next updates...