These two tests test direct I/O and buffered read repair, respectively,
with fail_make_request. However, by using "fail_make_request/times",
they rely on repair having a specific I/O pattern. My pending Btrfs
direct I/O refactoring patch series changes this I/O pattern and thus
breaks this test.
The dm-dust target (added in v5.2) emulates a device with bad blocks
that are fixed when written to (like a device that remaps bad blocks).
This is exactly what we want for testing repair. Add some common dm-dust
helpers and update the tests to use dm-dust.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>
Omar Sandoval