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Description of problem:

The outstanding problem of qemu using aio on unaligned partitions still needs fixing. The original set of problems were reported in 589985, and the equivalent ext4 bug is 615309. A set of fixes for XFS was just accepted upstream for 2.6.38, found here:

http://oss.sgi.com/archives/xfs/2011-01/msg00156.html

Version-Release number of selected component (if applicable):

RHEL 6.1

How reproducible:

100%

Steps to Reproduce:
1. Run test 240 in xfstests.
  
Actual results:
Sub block data corruption is detected

Expected results:
No data corruption.

Additional info:

The upstream patch series has too many dependencies to apply to a RHEL 6 tree easily, so I'm going to port only the first and last patches of the series and ignore all the clean-ups. The first patch fixes sync write error return values, the last patch fixes the unaligned dio issue.

Dave, if you can make this one for 6.1, can you set devel_ack?  thanks.

This request was evaluated by Red Hat Product Management for inclusion
in a Red Hat Enterprise Linux maintenance release. Product Management has 
requested further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed 
products. This request is not yet committed for inclusion in an Update release.

patches posted to rhkernel-list on 14/1/11

Patch(es) available on kernel-2.6.32-112.el6

Reproduced  in 2.6.32-94.el6 and verified in 2.6.32-104.el6.

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0542.html