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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: Damien Le Moal <damien.lemoal@wdc.com> Tested-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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@ -206,11 +206,27 @@ static ssize_t queue_write_hint_store(void *data, const char __user *buf,
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return count;
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}
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static int queue_zone_wlock_show(void *data, struct seq_file *m)
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{
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struct request_queue *q = data;
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unsigned int i;
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if (!q->seq_zones_wlock)
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return 0;
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for (i = 0; i < blk_queue_nr_zones(q); i++)
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if (test_bit(i, q->seq_zones_wlock))
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seq_printf(m, "%u\n", i);
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return 0;
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}
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static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
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{ "poll_stat", 0400, queue_poll_stat_show },
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{ "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
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{ "state", 0600, queue_state_show, queue_state_write },
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{ "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
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{ "zone_wlock", 0400, queue_zone_wlock_show, NULL },
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{ },
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};
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