Bug 639412 - block: must prevent merges of discard and write requests [rhel-6.0.z]
Summary: block: must prevent merges of discard and write requests [rhel-6.0.z]
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: kernel
Version: 6.1
Hardware: All
OS: Linux
urgent
urgent
Target Milestone: rc
: ---
Assignee: Frantisek Hrbata
QA Contact: Gris Ge
URL:
Whiteboard:
Depends On: 637805
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-10-01 17:05 UTC by RHEL Program Management
Modified: 2010-11-11 11:55 UTC (History)
18 users (show)

Fixed In Version: kernel-2.6.32-71.3.1.el6
Doc Type: Bug Fix
Doc Text:
Previously, a write request may have merged with a discard request. This could have posed a potential risk for 3rd party drivers which could possibly issue a discard without waiting properly. With this update, discarding of write block I/O requests by preventing merges of discard and write requests in one block I/O has been introduced, thus, resolving the possible risks.
Clone Of:
Environment:
Last Closed: 2010-11-10 19:10:43 UTC
Target Upstream Version:

Attachments (Terms of Use)
Add an attachment (proposed patch, testcase, etc.)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2010:0842 0 normal SHIPPED_LIVE Important: kernel security and bug fix update 2010-11-22 19:34:20 UTC

Description RHEL Program Management 2010-10-01 17:05:23 UTC 
This bug has been copied from bug #637805 and has been proposed
to be backported to 6.0 z-stream (EUS).
Comment 2 Frantisek Hrbata 2010-10-04 07:14:37 UTC 
in 2.6.32-71.3.1.el6
Comment 5 Barry Donahue 2010-10-21 14:58:06 UTC 
The bug was found upstream and there is no reproducible test case.
Comment 7 errata-xmlrpc 2010-11-10 19:10:43 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-2010-0842.html
Comment 8 Martin Prpič 2010-11-11 11:55:06 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:
Previously, a write request may have merged with a discard request. This could have posed a potential risk for 3rd party drivers which could possibly issue a discard without waiting properly. With this update, discarding of write block I/O requests by preventing merges of discard and write requests in one block I/O has been introduced, thus, resolving the possible risks.
Note You need to log in before you can comment on or make changes to this bug.