When debugging the ZBC code in the mq-deadline scheduler it is very
important to know which zones are locked and which zones are not
locked. Hence this patch that exports the zone locking information
through debugfs.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
Cc: Omar Sandoval <osandov@xxxxxx>
Cc: Damien Le Moal <damien.lemoal@xxxxxxx>
Cc: Ming Lei <ming.lei@xxxxxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Cc: Johannes Thumshirn <jthumshirn@xxxxxxx>
---
block/blk-mq-debugfs.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index eaf282e239b0..1be2116e09b5 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -206,11 +206,27 @@ static ssize_t queue_write_hint_store(void *data, const char __user *buf,
return count;
}
+static int queue_zone_wlock_show(void *data, struct seq_file *m)
+{
+ struct request_queue *q = data;
+ unsigned int i;
+
+ if (!q->seq_zones_wlock)
+ return 0;
+
+ for (i = 0; i < blk_queue_nr_zones(q); i++)
+ if (test_bit(i, q->seq_zones_wlock))
+ seq_printf(m, "%u\n", i);
+
+ return 0;
+}
+
static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{ "poll_stat", 0400, queue_poll_stat_show },
{ "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
{ "state", 0600, queue_state_show, queue_state_write },
{ "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
+ { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
{ },
};
--
2.16.2
