[Bug 251828] "zfs create -o <mode>" ignores mode when creating the device node

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251828

            Bug ID: 251828
           Summary: "zfs create -o <mode>" ignores mode when creating the
                    device node
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: asomers at FreeBSD.org

zvols have a "volmode" property that controls how their device nodes are
created: as geom devices (default), as non-geom character devices, or not at
all.  At least, it's supposed to do that.  But on 13-CURRENT, the volmode
property gets ignored at creation time.  The device always gets created as the
default type instead.

The easiest way to demonstrate the problem is to use gpart on the device node. 
It isn't supposed to work if the node is a non-geom device.  But it does!

# zfs create -o volmode=dev -V 64m testpool/vol
# gpart create -s gpt /dev/zvol/testpool/vol
zvol/testpool/vol created

However, if we change the volmode property after creation, then ZFS destroys
and recreates the device node with the correct volmode.

# zfs create -V 64m testpool/vol
# zfs set volmode=dev testpool/vol
# gpart create -s gpt /dev/zvol/testpool/vol
gpart: arg0 'zvol/testpool/vol': Invalid argument

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