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Date:	Thu, 22 Oct 2015 11:10:17 +0200
From:	Jan Kara <>
Subject: Test ext4/001


I've checked why test ext4/001 fails for me with DAX and after some
investigation I've realized that the test assumes that
extent_max_zeroout_kb is 32 KB and thus unwritten extent will get converted
to written as a whole and not split. With DAX that doesn't happen (because
of difference between EXT4_GET_BLOCKS_ flags passed in writeback path and
DAX write path) and so the result differs.

So I was wondering how to best fix this. Either we could switch
extent_max_zeroout_kb to 0 to make the result same (but that has a slight
disadvantage that we would lose testing of the zeroout logic) or we could
increase file size so that zeroout doesn't trigger or something else?
Anyone has some idea?

Jan Kara <>
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