Bug 236624

Summary:	dm-mirror: Call to rh_in_sync should be allowed to block in do_reads
Product:	Red Hat Enterprise Linux 5	Reporter:	Jonathan Earl Brassow <jbrassow>
Component:	kernel	Assignee:	Jonathan Earl Brassow <jbrassow>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	mbroz, rkenna
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2007-0959	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-07 19:46:50 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:	236626

Description Jonathan Earl Brassow 2007-04-16 20:00:57 UTC

When checking the sync status of a region, there are times when we must not
block.  Like when we are attempting to map I/O for the first time or in a
context that must not block.

do_reads operates in a separate kernel thread and should be allowed to block. 
[Disallowing it to do so means cluster mirroring can never read-balance, among
other things.]

Comment 1 Rob Kenna 2007-04-16 21:00:20 UTC

pm-ack for 4.6

Comment 2 Rob Kenna 2007-04-16 21:08:41 UTC

pm-ack for 5.1 (reset flag to ? waiting for 3 acks.)

Comment 3 Jonathan Earl Brassow 2007-05-08 18:30:29 UTC

assigned -> post

Comment 4 RHEL Program Management 2007-05-08 18:41:52 UTC

This request was evaluated by Red Hat Kernel Team for inclusion in a Red
Hat Enterprise Linux maintenance release, and has moved to bugzilla 
status POST.

Comment 5 Don Zickus 2007-06-16 00:33:36 UTC

in 2.6.18-27.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 8 errata-xmlrpc 2007-11-07 19:46:50 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 the 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/RHBA-2007-0959.html