This patch addresses multi-volume AdvFS v3 domains reporting
	- EIO errors (not attributable to hardware)

         For example, if a second volume is added to an existing 
         domain and the first volume then becomes 100% full, every 
         other file or directory creation will fail from then on:
              # cp /vmunix /test/file1
              cp: /test/file1: I/O error
              # mkdir teste5
              # mkdir teste6
              mkdir: cannot create teste6.
              teste6: I/O error

       - ENO_XTNTS error on failed mkfset

         If the domain is made multi-volume prior to creating
         a fileset then the mkfset command will fail:
              # mkfdmn -V 3 /dev/disk/dsk1a test
              # addvol /dev/disk/dsk1b test
              # mkfset test 1
              mkfset: can't create file set '1' in domain 'test'
              mkfset: error = ENO_XTNTS (-1036)




