From 0d3bd88d54f513723602b361dccfc71639f50779 Mon Sep 17 00:00:00 2001
From: Tejun Heo
Date: Tue, 3 Jul 2018 11:14:54 -0400
Subject: swap,blkcg: issue swap io with the appropriate context

For backcharging we need to know who the page belongs to when swapping
it out.  We don't worry about things that do ->rw_page (zram etc) at the
moment, we're only worried about pages that actually go to a block
device.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Josef Bacik <jbacik@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 mm/page_io.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'mm/page_io.c')

diff --git a/mm/page_io.c b/mm/page_io.c
index a552cb37e220..aafd19ec1db4 100644
--- a/mm/page_io.c
+++ b/mm/page_io.c
@@ -339,6 +339,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc,
 		goto out;
 	}
 	bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc);
+	bio_associate_blkcg_from_page(bio, page);
 	count_swpout_vm_event(page);
 	set_page_writeback(page);
 	unlock_page(page);
-- 
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