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From 4e589237979fdf90af38d466abd7fcd852356f02 Mon Sep 17 00:00:00 2001
From: Kai Krakow <kai@kaishome.de>
Date: Sat, 17 Aug 2019 02:33:43 +0200
Subject: [PATCH] cgroup: Also set io.bfq.weight

Current kernels with BFQ scheduler do not yet set their IO weight
through "io.weight" but through "io.bfq.weight" (using a slightly
different interface supporting only default weights, not per-device
weights). This commit enables "IOWeight=" to just to that.

This patch may be dropped at some time later.

Github-Link: https://github.com/systemd/systemd/issues/7057
Signed-off-by: Kai Krakow <kai@kaishome.de>

(cherry picked from commit 21221ce1ce9a572e82d46d80692afd65c224fc50)

Related: #1927290
---
 src/core/cgroup.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/core/cgroup.c b/src/core/cgroup.c
index 71e30fd4db..f02cc31c6e 100644
--- a/src/core/cgroup.c
+++ b/src/core/cgroup.c
@@ -984,6 +984,14 @@ static void cgroup_context_apply(
                                 log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
                                               "Failed to set io.weight: %m");
 
+                        /* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
+                         * See also: https://github.com/systemd/systemd/pull/13335 */
+                        xsprintf(buf, "%" PRIu64 "\n", weight);
+                        r = cg_set_attribute("io", path, "io.bfq.weight", buf);
+                        if (r < 0)
+                                log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EACCES) ? LOG_DEBUG : LOG_WARNING, r,
+                                              "Failed to set io.bfq.weight: %m");
+
                         if (has_io) {
                                 CGroupIODeviceWeight *w;