blk-mq: make the sysfs mq/ layout reflect current mappings
Currently blk-mq registers all the hardware queues in sysfs,
regardless of whether it uses them (e.g. they have CPU mappings)
or not. The unused hardware queues lack the cpux/ directories,
and the other sysfs entries (like active, pending, etc) are all
zeroes.
Change this so that sysfs correctly reflects the current mappings
of the hardware queues.
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 21f952a..71f564e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1924,6 +1924,8 @@
{
blk_mq_freeze_queue(q);
+ blk_mq_sysfs_unregister(q);
+
blk_mq_update_queue_map(q->mq_map, q->nr_hw_queues);
/*
@@ -1934,6 +1936,8 @@
blk_mq_map_swqueue(q);
+ blk_mq_sysfs_register(q);
+
blk_mq_unfreeze_queue(q);
}