Hi Chao,

It does not miss UPDATE_INO. The mode argument only selects whether to
wait: both APPEND_INO and UPDATE_INO call
flush_workqueue(sbi->evict_wq), and both updates are queued on the same
eviction workqueue. Therefore, one call with APPEND_INO also drains
pending UPDATE_INO work. A second call with UPDATE_INO would flush the
same queue again.

Thanks,
Wenjie