It's not useful, they are internal and/or error handling recovery commands.
Acked-by: Paolo Valente <[email protected]> Signed-off-by: Jens Axboe <[email protected]> --- block/blk-mq.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 4e9d83594cca..64630caaf27e 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -360,9 +360,11 @@ static struct request *blk_mq_get_request(struct request_queue *q, /* * Flush requests are special and go directly to the - * dispatch list. + * dispatch list. Don't include reserved tags in the + * limiting, as it isn't useful. */ - if (!op_is_flush(op) && e->type->ops.mq.limit_depth) + if (!op_is_flush(op) && e->type->ops.mq.limit_depth && + !(data->flags & BLK_MQ_REQ_RESERVED)) e->type->ops.mq.limit_depth(op, data); } -- 2.7.4
