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This test verifies that the an unwritten extent is properly marked as written after writing into it. There was a hard-to-hit bug which would occasionally trigger with ext4 for which this test was a reproducer. This has been fixed after moving ext4 to use iomap for Direct I/O's, although as of this writing, there are still some occasional failures on ext4 when block size < page size. Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Eryu Guan <guaneryu@gmail.com> Signed-off-by: Eryu Guan <guaneryu@gmail.com>