From 671058fb2a2aac4e70f01b316b06bc59b98bd138 Mon Sep 17 00:00:00 2001 From: Tejun Heo Date: Mon, 5 Mar 2012 13:15:29 -0800 Subject: block: make blk-throttle preserve the issuing task on delayed bios 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 Cc: Vivek Goyal Signed-off-by: Jens Axboe --- block/blk-throttle.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'block') diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 08b7ab292a80..4ba141820a2e 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; -- cgit v1.2.3-59-g8ed1b