Re: [PATCH] zbd: Fix unexpected job termination by open zone search failure

[Jens Axboe <axboe@kernel.dk>]

On 9/29/21 6:02 PM, Shin'ichiro Kawasaki wrote:
> Test case #46 in t/zbd/test-zbd-support fails when it is repeated
> hundreds of times on null_blk zoned devices. The test case uses libaio
> IO engine to run 8 random write jobs on 4 sequential write required
> zones. When all of the 4 zones get almost full but still open for
> in-flight writes, the helper function zbd_convert_to_open_zone() fails
> to get an opened zone for next write. This results in unexpected job
> termination.
> 
> To avoid the unexpected job termination, retry the steps in
> zbd_convert_to_open_zone(). Before retry, call io_u_quiesce() to ensure
> that the in-flight writes get completed.
> 
> To prevent infinite loop by the retry, retry only when any IOs are
> in-flight or in-flight IOs get completed. To check in-flight IO count of
> all jobs, add a new helper function any_io_in_flight().

Applied, thanks.

-- 
Jens Axboe