[PATCH 2/2] blk-mq-debugfs: Show zone locking information
From: Bart Van Assche <hidden>
Date: 2018-02-28 00:32:14
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
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 <redacted> Cc: Omar Sandoval <redacted> Cc: Damien Le Moal <redacted> Cc: Ming Lei <redacted> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <redacted> --- 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