zloop: make the write pointer of full zones invalid

The write pointer of zones that are in the full condition is always
invalid. Reflect that fact by setting the write pointer of full zones
to ULLONG_MAX.

Fixes: eb0570c7df23 ("block: new zoned loop block device driver")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/zloop.c b/drivers/block/zloop.c
index 92be9f0af00a100b565db44857ad292a2948d7e8..a975b1d07f1c53f8de910af9fb13200cea27a5cd 100644 (file)
--- a/drivers/block/zloop.c
+++ b/drivers/block/zloop.c
@@ -177,7 +177,7 @@ static int zloop_update_seq_zone(struct zloop_device *zlo, unsigned int zone_no)
                zone->wp = zone->start;
        } else if (file_sectors == zlo->zone_capacity) {
                zone->cond = BLK_ZONE_COND_FULL;
-               zone->wp = zone->start + zlo->zone_size;
+               zone->wp = ULLONG_MAX;
        } else {
                zone->cond = BLK_ZONE_COND_CLOSED;
                zone->wp = zone->start + file_sectors;
@@ -326,7 +326,7 @@ static int zloop_finish_zone(struct zloop_device *zlo, unsigned int zone_no)
        }
 
        zone->cond = BLK_ZONE_COND_FULL;
-       zone->wp = zone->start + zlo->zone_size;
+       zone->wp = ULLONG_MAX;
        clear_bit(ZLOOP_ZONE_SEQ_ERROR, &zone->flags);
 
  unlock:
@@ -433,8 +433,10 @@ static void zloop_rw(struct zloop_cmd *cmd)
                 * copmpletes.
                 */
                zone->wp += nr_sectors;
-               if (zone->wp == zone_end)
+               if (zone->wp == zone_end) {
                        zone->cond = BLK_ZONE_COND_FULL;
+                       zone->wp = ULLONG_MAX;
+               }
        }
 
        rq_for_each_bvec(tmp, rq, rq_iter)