Consider the zero-copy transmission of a page that was wired by mlock(2). If a copy-on-write fault occurs on the page, the new copy should inherit a part of the original page's wire count.
Consider the zero-copy transmission of a page that was wired by mlock(2).
If a copy-on-write fault occurs on the page, the new copy should inherit
a part of the original page's wire count.

Submitted by: tegge
MFC after: 1 week

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase