[PATCH 1/2] zbd: avoid write with rwmixwrite=0 option

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

Since the commit fb0259fb276a ("zbd: Ensure first I/O is write for
random read/write to sequential zones"), fio issues write as the first
I/O when zonemode=zbd and rw=randrw options are specified. However, fio
issues the first write even when rwmixwrite=0 option is specified. Users
do not expect such write and it confuses the users. To avoid the
confusion, suppress the write by referring td->o.rwmix[DDIR_WRITE].

Fixes: fb0259fb276a ("zbd: Ensure first I/O is write for random read/write to sequential zones")
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
---
 zbd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/zbd.c b/zbd.c
index c4f7b12f..61b5b688 100644
--- a/zbd.c
+++ b/zbd.c
@@ -1876,7 +1876,8 @@ enum fio_ddir zbd_adjust_ddir(struct thread_data *td, struct io_u *io_u,
 	if (ddir != DDIR_READ || !td_rw(td))
 		return ddir;
 
-	if (io_u->file->last_start[DDIR_WRITE] != -1ULL || td->o.read_beyond_wp)
+	if (io_u->file->last_start[DDIR_WRITE] != -1ULL ||
+	    td->o.read_beyond_wp || td->o.rwmix[DDIR_WRITE] == 0)
 		return DDIR_READ;
 
 	return DDIR_WRITE;
-- 
2.43.0