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Commit 18bc4230 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

blk-mq-debugfs: Show zone locking information 



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.

Cc: Omar Sandoval <osandov@fb.com>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Tested-by: default avatarDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: default avatarBart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 1209cb7f

block/blk-mq-debugfs.c

+16 −0
Original line number Diff line number Diff line
@@ -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 },

	{ },

};