To: linux-xfs@sgi.com, sgi.bugs.xfs@sgi.com
Subject: TAKE 947420 - Fixing the conflict between DIO write and truncate
Message-Id: <20060320213307.B9D129E2A247@attica.americas.sgi.com>
Date: Mon, 20 Mar 2006 15:33:07 -0600 (CST)
From: yingping@sgi.com (Yingping Lu)
Sender: linux-xfs-bounce@oss.sgi.com
Errors-to: linux-xfs-bounce@oss.sgi.com
Precedence: bulk
Content-Length: 1099
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Fixing the error caused by the conflict between DIO Write's conversion and concurrent truncate operations. Use vn_iowait to wait for the completion of any pending DIOs. Since the truncate requires exclusive IOLOCK, so this blocks any further DIO operations since DIO write also needs exclusive IOBLOCK. This serves as a barrier and prevent any potential starvation.

Date:  Mon Mar 20 13:31:13 PST 2006
Workarea:  attica.americas.sgi.com:/data/lwork/attica3/yingping/xfs_kern_947420
Inspected by:  dgc,nathans

The following file(s) were checked into:
  bonnie.engr.sgi.com:/isms/xfs-kern/xfs-linux


Modid:  xfs-linux:xfs-kern:208088a
xfs_vnodeops.c - 1.668 - changed
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_vnodeops.c.diff?r1=text&tr1=1.668&r2=text&tr2=1.667&f=h
	- Add vn_iowait to wait for the completion of any pending DIO write for truncate operation

xfs_inode.c - 1.433 - changed
http://oss.sgi.com/cgi-bin/cvsweb.cgi/xfs-linux/xfs_inode.c.diff?r1=text&tr1=1.433&r2=text&tr2=1.432&f=h
	- Add vn_iowait to wait for the completion of any pending DIO write for truncate operation