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Date:	Mon, 30 Jul 2012 21:53:15 -0500
From:	Nick Semenkovich <>
Subject: "Unknown code" error when enabling metadata_csum on ext4 raid1 device

I'm trying to enable metadata_csum on an ext4 raid1 device, but end up
with a semi-cryptic error.

(This is probably the same thing Tomasz Chmielewski reported in )

Is this issue being tracked someplace?

$ uname -ar
Linux dev 3.5.0-6-generic #6-Ubuntu SMP Mon Jul 23 19:52:14 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux

$ git clone git://
$ ./configure
$ make progs
$ sudo misc/tune2fs -O metadata_csum /dev/md1
tune2fs 1.42.3 (14-May-2012)
rewrite_directory: Unknown code Ijv 64 while rewriting directories

The error code changes when I re-run tune2fs (to [a-zA-Z]*3 64).

I've tried this on the master, "next", & "pu" git branches, all with errors.

$ debugfs -R 'stats' /dev/md1 >


Nick Semenkovich
Laboratory of Dr. Jeffrey I. Gordon
Medical Scientist Training Program
School of Medicine
Washington University in St. Louis
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