[PATCH 36/36] block: make blk-throttle preserve the issuing task on delayed bios

[Tejun Heo <tj@kernel.org>]

Make blk-throttle call bio_associate_current() on bios being delayed
such that they get issued to block layer with the original io_context.
This allows stacking blk-throttle and cfq-iosched propio policies.
bios will always be issued with the correct ioc and blkcg whether it
gets delayed by blk-throttle or not.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
---
 block/blk-throttle.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 08b7ab2..4ba1418 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -894,6 +894,9 @@ bool blk_throtl_bio(struct request_queue *q, struct bio *bio)
 		goto out;
 	}
 
+	/* bio_associate_current() needs ioc, try creating */
+	create_io_context(GFP_ATOMIC, q->node);
+
 	/*
 	 * A throtl_grp pointer retrieved under rcu can be used to access
 	 * basic fields like stats and io rates. If a group has no rules,
@@ -958,6 +961,7 @@ queue_bio:
 			tg->io_disp[rw], tg->iops[rw],
 			tg->nr_queued[READ], tg->nr_queued[WRITE]);
 
+	bio_associate_current(bio);
 	throtl_add_bio_tg(q->td, tg, bio);
 	throttled = true;
 
-- 
1.7.7.3