Bug 505601 - ext4 preallocation corruption with truncate
ext4 preallocation corruption with truncate
Product: Red Hat Enterprise Linux 5
Classification: Red Hat
Component: kernel (Show other bugs)
All Linux
low Severity medium
: rc
: ---
Assigned To: Eric Sandeen
Red Hat Kernel QE team
Depends On:
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Reported: 2009-06-12 10:53 EDT by Eric Sandeen
Modified: 2009-09-02 04:57 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2009-09-02 04:57:31 EDT
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Description Eric Sandeen 2009-06-12 10:53:29 EDT
We should consider this still for 5.4 I think (ext4 change), as it may be a corruption issue.  I'll track down a testcase.

From: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Date: Wed, 10 Jun 2009 18:22:55 +0000 (-0400)
Subject: ext4: Avoid corrupting the uninitialized bit in the extent during truncate
X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=a41f20716975910d9beb90b7efc61107901492b8

ext4: Avoid corrupting the uninitialized bit in the extent during truncate

The unitialized bit was not properly getting preserved in in an extent
which is partially truncated because the it was geting set to the
value of the first extent to be removed or truncated as part of the
truncate operation, and if there are multiple extents are getting
removed or modified as part of the truncate operation, it is only the
last extent which will might be partially truncated, and its
uninitalized bit is not necessarily the same as the first extent to be

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Comment 2 RHEL Product and Program Management 2009-06-12 11:33:17 EDT
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
Comment 3 Eric Sandeen 2009-06-16 15:40:26 EDT
Sent to rhkernel-list on Tue Jun 16 2009
Comment 4 Don Zickus 2009-06-18 10:52:23 EDT
in kernel-2.6.18-154.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Please do NOT transition this bugzilla state to VERIFIED until our QE team
has sent specific instructions indicating when to do so.  However feel free
to provide a comment indicating that this fix has been verified.
Comment 7 errata-xmlrpc 2009-09-02 04:57:31 EDT
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.


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