QA output created by 018
zero-length file:
Before: 0
After: 0
Sparse file (no blocks):
Before: 0
After: 0
Contiguous file:
Before: 1
After: 1
Write backwards sync, but contiguous - should defrag to 1 extent
Before: in_range(5, 10)
After: Found 10 max: 1
Failed to adequately defragment file
(see /root/xfstests-dev/results//btrfs_aarch64_normal_4ksectorsize/generic/018.full for details)