For an I/O trying to read an offline zone, another zone must be chosen
using zbd_find_zone(). However, in zbd_adjust_block(), the variable
range is set to 0 for an offline zone, which in the case of a random
read pattern causes evaluation of the first if condition of the
DDIR_READ case to true, resulting in the use of the offline zone.
Fix this simply by setting range to -1 so that the first if statement is
false and zbd_find_zone() executed.
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxx>
---
zbd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/zbd.c b/zbd.c
index 19511454..e98c5a50 100644
--- a/zbd.c
+++ b/zbd.c
@@ -1157,7 +1157,7 @@ enum io_u_action zbd_adjust_block(struct thread_data *td, struct io_u *io_u)
* hit the medium.
*/
range = zb->cond != BLK_ZONE_COND_OFFLINE ?
- ((zb->wp - zb->start) << 9) - io_u->buflen : 0;
+ ((zb->wp - zb->start) << 9) - io_u->buflen : -1;
if (td_random(td) && range >= 0) {
io_u->offset = (zb->start << 9) +
((io_u->offset - (zb->start << 9)) %
--
2.17.1
