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>
Theodore Ts'o