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Bug 837963 - ext4 gets corrupted when hosting loopback filesystems due to discard
Summary: ext4 gets corrupted when hosting loopback filesystems due to discard
Keywords:
Status: CLOSED DUPLICATE of bug 799627
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: kernel
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Eric Sandeen
QA Contact: Red Hat Kernel QE team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2012-07-05 22:59 UTC by Eric Sandeen
Modified: 2012-07-05 23:06 UTC (History)
0 users

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2012-07-05 23:06:08 UTC
Target Upstream Version:
Embargoed:

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Description Eric Sandeen 2012-07-05 22:59:19 UTC 
When using ext4 as the backing device for a loopback xfs filesystem, it gets corrupted during an xfstests run.

A short reproducer is to configure the test device as xfs, and make the scratch device a 10G loopback filesystem, hosted on ext4.  Then run ./check 167 168

This is due the discards issued by mkfs.xfs during the test, which punches holes in the ext4 file, and ends up corrupting it.  It's fixed upstream by:

commit 5f95d21fb6f2aaa52830e5b7fb405f6c71d3ab85
Author: Lukas Czerner <lczerner>
Date:   Mon Mar 19 23:03:19 2012 -0400

    ext4: rewrite punch hole to use ext4_ext_remove_space()
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