In case read is chosen for the first random I/O for sequential write required zones, fio stops because no data can be read from the zones with empty status. Enforce to write at the first I/O to make sure data to read exists for the following read operations. The unexpected fio stop symptom was observed with test case #30 of t/zbd/test-zbd-support. When the test case was run repeatedly resetting all zones with -r option, it often passes with too short run time. Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@xxxxxxx> --- zbd.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/zbd.c b/zbd.c index 0b0d4f40..abfa802c 100644 --- a/zbd.c +++ b/zbd.c @@ -1348,6 +1348,16 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u) if (!zbd_zone_swr(zb)) return io_u_accept; + /* + * In case read direction is chosen for the first random I/O, fio with + * zonemode=zbd stops because no data can be read from zoned block + * devices with all empty zones. Overwrite the first I/O direction as + * write to make sure data to read exists. + */ + if (td_rw(td) && !f->zbd_info->sectors_with_data + && !td->o.read_beyond_wp) + io_u->ddir = DDIR_WRITE; + /* * Accept the I/O offset for reads if reading beyond the write pointer * is enabled. -- 2.25.1
