From: Gary Hawco <ghawco@cox.net>
Subject: How to switch ext4 to ordered_data mode
Date: Sat, 14 Jun 2008 00:39:35
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To: "Theodore Ts'o" <tytso@mit.edu>,
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Ted,

I notice that ext4dev defaults to data=writeback mode. This is in contrast
to ext3 which uses ordered data mode. Tune2fs from git does not seem to be
able to change this using "tune2fs -o ^journal_data_writeback /dev/sdaX"
followed by "tune2fs -o journal_data_ordered /dev/sdaX.

Is this change intentional or a not yet worked out bug?

Thanks,
Gary Hawco