Bug 647297

Summary:	Direct IO write to a file on an nfs mount does not work
Product:	Red Hat Enterprise Linux 5	Reporter:	Steve Dickson <steved>
Component:	kernel	Assignee:	Steve Dickson <steved>
Status:	CLOSED ERRATA	QA Contact:	yanfu,wang <yanwang>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	5.6	CC:	abaron, apevec, bfields, cpelland, dhoward, eguan, iheim, jlayton, jpirko, jturner, mburns, mzywusko, smizrahi, steved, syeghiay, yanwang
Target Milestone:	rc	Keywords:	Regression, TestBlocker, ZStream
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:	Storage
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	Performing a Direct IO write operation to a file on an NFS mount did not work. With this update, the minor error in the source code was fixed and the Direct IO operation works as expected.	Story Points:	---
Clone Of:	647245	Environment:
Last Closed:	2011-01-13 21:58:29 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	647601

Comment 1 RHEL Program Management 2010-10-27 20:09:11 UTC

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.

Comment 2 Don Howard 2010-10-28 20:01:27 UTC

*** Bug 647245 has been marked as a duplicate of this bug. ***

Comment 6 Jarod Wilson 2010-11-01 21:00:40 UTC

in kernel-2.6.18-230.el5
You can download this test kernel (or newer) from http://people.redhat.com/jwilson/el5

Detailed testing feedback is always welcomed.

Comment 8 Eryu Guan 2010-11-02 03:35:49 UTC

reproduced on 2.6.18-229.el5
[root@dell-pet310-02 647601-dio-write-on-nfs]# uname -a
Linux dell-pet310-02.lab.bos.redhat.com 2.6.18-229.el5 #1 SMP Tue Oct 26 18:54:44 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@dell-pet310-02 647601-dio-write-on-nfs]# mount | tail -1
localhost:/home on /root/647601-dio-write-on-nfs/nfs type nfs (rw,addr=127.0.0.1)
[root@dell-pet310-02 647601-dio-write-on-nfs]# ./reproducer /root/647601-dio-write-on-nfs/nfs/testfile
Could not write to file (12) Cannot allocate memory
[root@dell-pet310-02 647601-dio-write-on-nfs]# echo $?
12
[root@dell-pet310-02 647601-dio-write-on-nfs]#

verified on 2.6.18-230.el5
[root@dell-pet310-02 647601-dio-write-on-nfs]# uname -a
Linux dell-pet310-02.lab.bos.redhat.com 2.6.18-230.el5 #1 SMP Thu Oct 28 17:09:10 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@dell-pet310-02 647601-dio-write-on-nfs]# mount | tail -1
localhost:/home on /root/647601-dio-write-on-nfs/nfs type nfs (rw,addr=127.0.0.1)
[root@dell-pet310-02 647601-dio-write-on-nfs]# ./reproducer /root/647601-dio-write-on-nfs/nfs/testfile
[root@dell-pet310-02 647601-dio-write-on-nfs]# echo $?
0
[root@dell-pet310-02 647601-dio-write-on-nfs]#

verified on x86_64 and i386

Comment 9 Martin Prpič 2010-11-11 14:09:12 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Performing a Direct IO write operation to a file on an NFS mount did not work. With this update, the minor error in the source code was fixed and the Direct IO operation works as expected.

Comment 11 errata-xmlrpc 2011-01-13 21:58:29 UTC

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-2011-0017.html