btrfs/142: enhance regression test for nocsum dio read's repair

btrfs/142: enhance regression test for nocsum dio read's repair

I catch this following error from dmesg when this testcase fails.

[17446.661127] Buffer I/O error on dev sdb1, logical block 64, async page read

We expect to inject disk IO errors on the device when xfs_io reads
the specific file, but other processes may trigger IO error earlier.
So, we can use task-filter to solve this problem.

Signed-off-by: Lu Fengqi <lufq.fnst@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>