blk-throttle: process limit change only through one function

With the help of cgroup interface one can go and upate the bps/iops
limits of existing group. Once the limits are udpated, a thread is
woken up to see if some blocked group needs recalculation based on new
limits and needs to be requeued.

There was also a piece of code where I was checking for group limit
update when a fresh bio comes in. This patch gets rid of that piece of
code and keeps processing the limit change at one place
throtl_process_limit_change().  It just keeps the code simple and easy
to understand.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 061dee66e2a..a29f09240c0 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -1009,14 +1009,8 @@ int blk_throtl_bio(struct request_queue *q, struct bio **biop)
                 /*
                  * There is already another bio queued in same dir. No
                  * need to update dispatch time.
-                 * Still update the disptime if rate limits on this group
-                 * were changed.
                  */
-                if (!tg->limits_changed)
-                        update_disptime = false;
-                else
-                        tg->limits_changed = false;
-
+                update_disptime = false;
                 goto queue_bio;
         }