[PATCH] zloop: fix zone append check in zloop_rw()

[Damien Le Moal <dlemoal@kernel.org>]

While commit cf28f6f923cb ("zloop: fail zone append operations that are
targeting full zones") added a check in zloop_rw() that a zone append is
not issued to a full zone, commit e3a96ca90462 ("zloop: simplify checks
for writes to sequential zones") inadvertently removed the check to
verify that there is enough unwritten space in a zone for an incoming
zone append opration.

Re-add this check in zloop_rw() to make sure we do not write beyond the
end of a zone. Of note is that this same check is already present in the
function zloop_set_zone_append_sector() when ordered zone append is in
use.

Reported-by: Hans Holmberg <Hans.Holmberg@wdc.com>
Fixes: e3a96ca90462 ("zloop: simplify checks for writes to sequential zones")
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
---
 drivers/block/zloop.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/block/zloop.c b/drivers/block/zloop.c
index c4da3116f7a9..1273bbca7843 100644
--- a/drivers/block/zloop.c
+++ b/drivers/block/zloop.c
@@ -448,7 +448,8 @@ static void zloop_rw(struct zloop_cmd *cmd)
 			 * and set the target sector in zloop_queue_rq().
 			 */
 			if (!zlo->ordered_zone_append) {
-				if (zone->cond == BLK_ZONE_COND_FULL) {
+				if (zone->cond == BLK_ZONE_COND_FULL ||
+				    zone->wp + nr_sectors > zone_end) {
 					spin_unlock_irqrestore(&zone->wp_lock,
 							       flags);
 					ret = -EIO;
-- 
2.51.1