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Bug 236624 - dm-mirror: Call to rh_in_sync should be allowed to block in do_reads
Summary: dm-mirror: Call to rh_in_sync should be allowed to block in do_reads
Alias: None
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel
Version: 5.0
Hardware: All
OS: Linux
Target Milestone: ---
: ---
Assignee: Jonathan Earl Brassow
QA Contact: Martin Jenner
Depends On:
Blocks: 236626
TreeView+ depends on / blocked
Reported: 2007-04-16 20:00 UTC by Jonathan Earl Brassow
Modified: 2007-11-30 22:07 UTC (History)
2 users (show)

Fixed In Version: RHBA-2007-0959
Doc Type: Bug Fix
Doc Text:
Clone Of:
Last Closed: 2007-11-07 19:46:50 UTC
Target Upstream Version:

Attachments (Terms of Use)

System ID Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2007:0959 normal SHIPPED_LIVE Updated kernel packages for Red Hat Enterprise Linux 5 Update 1 2007-11-08 00:47:37 UTC

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 Product and 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

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.

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