Bug 631950

Summary:	remove FS-Cache code from NFS
Product:	Red Hat Enterprise Linux 5	Reporter:	Jeff Layton <jlayton>
Component:	kernel	Assignee:	Jeff Layton <jlayton>
Status:	CLOSED ERRATA	QA Contact:	yanfu,wang <yanwang>
Severity:	medium	Docs Contact:
Priority:	urgent
Version:	5.6	CC:	ajb, amyagi, anton, bfields, dhoward, dhowells, elliott+redhat, jwest, qcai, rwheeler, steved
Target Milestone:	rc	Keywords:	ZStream
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:	447474	Environment:
Last Closed:	2011-07-21 10:19:49 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:	447474, 454427
Bug Blocks:	739922

Description Jeff Layton 2010-09-08 18:12:23 UTC

We disabled the NFS FS-Cache code in the kernel configs in RHEL5.3 and "nerfed" the mount option. At the time we had a lively discussion on RHKL about whether to go ahead and back out all of the fscache code. The time before 5.3 shipped was growing short however, and we opted to take a small, simple patch to just disable the mount option and then plan to commit the larger patch to remove fscache from RHEL5 altogether in 5.4.

That latter part never happened. So, now a fair bit of the NFS code in RHEL5 is divergent from upstream code. That makes backporting difficult. I'm now bumping up against that since I'm looking at backporting a fair number of upstream patches to fix some writeback problems (see bug 441730 and bug 516490).

Cloning the original bug for us to reconsider ripping out the fscache code for 5.7.

Comment 2 Jeff Layton 2010-09-14 19:06:05 UTC

*** Bug 481680 has been marked as a duplicate of this bug. ***

Comment 4 RHEL Program Management 2011-02-01 16:54:49 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 9 Jarod Wilson 2011-03-16 18:01:29 UTC

Patch(es) available in kernel-2.6.18-248.el5
Detailed testing feedback is always welcomed.

Comment 11 yanfu,wang 2011-06-03 06:46:37 UTC

verified the patch is being applied in kernel-2.6.18-264.el5 and according to comment #6, nfs works normally, pls check the below regression test results:
https://errata.devel.redhat.com/errata/show/10670#c47

Comment 12 errata-xmlrpc 2011-07-21 10:19:49 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-2011-1065.html