The attached patch corrects the linux kernel reservation handling.  Currently 
linux fails badly when presented with SCSI reservations in a clustered 
environment.  The patch also completes Doug Gilbert's reset injection system 
in the sg driver.  The patches have no effect on the main line SCSI code, but 
they are fairly essential to those of us working in clustering and using 
reservations for I/O fencing.

I've run the patch through a 12 hour stress test in a two node cluster using 
the sym53c875 and aic7xxx (AHA 2944/UW) SCSI cards.

James Bottomley