ADD 794396 - xfs_zero_last_block "unwritten" & "DELWRI" messages

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View Incident: 
http://co-op.engr.sgi.com/BugWorks/code/bwxquery.cgi?search=Search&wlong=1&view_type=Bug&wi=794396

 Status : open                         Priority : 3                         
 Assigned Engineer : cattelan          Submitter : dxm                      
*Modified User : dxm                  *Modified User Domain : engr          
*Description :
under certain circumstances, xfs_zero_last_block generates
messages:

xfs_zero_last_block: unwritten?
xfs_zero_last_block: We want DELWRI? not waiting?

And eventually things fail. This might be a related panic:

XFS assertion failed: offset_fsb >= imap[nimaps].br_startoff + 
imap[i].br_blockcount, file: xfs_lrw.c, line: 1681
kernel BUG at xfs_debug.c:50!

.....


==========================
ADDITIONAL INFORMATION (ADD)
From: dxm@engr (BugWorks)
Date: Jun 27 2000 06:57:47PM
==========================

These messages don't appear on filesystems with "unwritten=0".
nathans' patch makes this the default.