5404 smbfs needs mmap support
This is (mostly) work from Jilin Xpd jilinxpd@gmail.com

done during the 2012 Google Summer of Code program.

I finished it up, did some debug and testing etc.

Along the way, I tried to make it "closer" to the

NFS code from which this was derived.
Latest version is on github here:

https://github.com/gwr/illumos-gate/tree/smbcl-mmap5b

Compile things in an smbfs mount (the linker is among the long list of

evil tools that don't have a fall-back when mmap(2) is unsupported).

There are also some STC-derived tests coming (see other review).

wr@oi-test:/$ SRV=orion opt/smbclient-tests/bin/smbclienttest -c opt/smbclient-tests/runfiles/just-mmap.run 
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_001 (run as root) [00:19] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_002 (run as root) [00:29] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_003 (run as root) [00:41] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_004 (run as root) [00:42] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_005 (run as root) [00:12] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_006 (run as root) [00:10] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_007 (run as root) [00:07] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_008 (run as root) [00:02] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_009 (run as root) [00:02] [PASS]
Test: /opt/smbclient-tests/tests/smbfs/mmap/tp_mmap_010 (run as root) [00:52] [PASS]

Results Summary
PASS      10

Running Time:   00:03:40
Percent passed: 100.0%