block: don't allow the same type rq_qos add more than once

In the Linux kernel, the following vulnerability has been resolved:

block: don't allow the same type rq_qos add more than once

In our test of iocost, we encountered some list add/del corruptions of

inner_walk list in ioc_timer_fn.

The reason can be described as follows:

cpu 0 cpu 1

ioc_qos_write ioc_qos_write

ioc = q_to_ioc(queue);

if (!ioc) {

ioc = kzalloc();

ioc = q_to_ioc(queue);

if (!ioc) {

ioc = kzalloc();

...

rq_qos_add(q, rqos);

}

...

rq_qos_add(q, rqos);

...

}

When the io.cost.qos file is written by two cpus concurrently, rq_qos may

be added to one disk twice. In that case, there will be two iocs enabled

and running on one disk. They own different iocgs on their active list. In

the ioc_timer_fn function, because of the iocgs from two iocs have the

same root iocg, the root iocg's walk_list may be overwritten by each other

and this leads to list add/del corruptions in building or destroying the

inner_walk list.

And so far, the blk-rq-qos framework works in case that one instance for

one type rq_qos per queue by default. This patch make this explicit and

also fix the crash above.