- Enable debug messages but set log level to be quiet. Provide a
system (hw.iscsi.debug) to set the log level at run time.
- Replace old tsleep/wakeup synchronization with mutexes and condvars.
- Defer actions from callouts (basically timeouts) to the cleanup thread.
- Protect lists and unique ids with mutexes. protect connection usecount
by using atomic operations.
- Assert kernel lock when calling into scsipi and network code.
- Use this to make send/receive/cleanup threads MPSAFE.
- Fix handling of out-of-CCB/out-of-PDU conditions against the scsipi layer.
- Bump number of PDUs to 128 to avoid virtually all out-of-PDU conditions
- Make use of softc structure for attach/detach operations.
- Track open file handles to prevent detach when busy.
- Move some global variables to make them static.
- Fix 'Overlapping Commands Attempted' error by marking commands as
simply ordered (ATTR_SIMPLE) like FreeBSD.
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