From 39b7d11c4b75b3213054f7730887acca90f62969 Mon Sep 17 00:00:00 2001
Message-Id: <39b7d11c4b75b3213054f7730887acca90f62969@dist-git>
From: Pavel Hrdina <phrdina@redhat.com>
Date: Mon, 1 Jul 2019 17:07:34 +0200
Subject: [PATCH] vircgroup: introduce virCgroupV2(Set|Get)BlkioDeviceWeight
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit 568f746eafce1194dc10cc91a41c91bf08fadd53)

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1689297

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Message-Id: <5dd74b70bcec7b3cd7186b53e76857dcf1d21c6f.1561993100.git.phrdina@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/util/vircgroupv2.c | 51 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)

diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index fcf39406e1..86b3fc127a 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -694,6 +694,55 @@ virCgroupV2GetBlkioIoDeviceServiced(virCgroupPtr group,
 }
 
 
+static int
+virCgroupV2SetBlkioDeviceWeight(virCgroupPtr group,
+                                const char *path,
+                                unsigned int weight)
+{
+    VIR_AUTOFREE(char *) str = NULL;
+    VIR_AUTOFREE(char *) blkstr = NULL;
+
+    if (!(blkstr = virCgroupGetBlockDevString(path)))
+        return -1;
+
+    if (virAsprintf(&str, "%s%d", blkstr, weight) < 0)
+        return -1;
+
+    return virCgroupSetValueStr(group,
+                                VIR_CGROUP_CONTROLLER_BLKIO,
+                                "io.weight",
+                                str);
+}
+
+
+static int
+virCgroupV2GetBlkioDeviceWeight(virCgroupPtr group,
+                                const char *path,
+                                unsigned int *weight)
+{
+    VIR_AUTOFREE(char *) str = NULL;
+
+    if (virCgroupGetValueForBlkDev(group,
+                                   VIR_CGROUP_CONTROLLER_BLKIO,
+                                   "io.weight",
+                                   path,
+                                   &str) < 0) {
+        return -1;
+    }
+
+    if (!str) {
+        *weight = 0;
+    } else if (virStrToLong_ui(str, NULL, 10, weight) < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("Unable to parse '%s' as an integer"),
+                       str);
+        return -1;
+    }
+
+    return 0;
+}
+
+
 virCgroupBackend virCgroupV2Backend = {
     .type = VIR_CGROUP_BACKEND_TYPE_V2,
 
@@ -720,6 +769,8 @@ virCgroupBackend virCgroupV2Backend = {
     .getBlkioWeight = virCgroupV2GetBlkioWeight,
     .getBlkioIoServiced = virCgroupV2GetBlkioIoServiced,
     .getBlkioIoDeviceServiced = virCgroupV2GetBlkioIoDeviceServiced,
+    .setBlkioDeviceWeight = virCgroupV2SetBlkioDeviceWeight,
+    .getBlkioDeviceWeight = virCgroupV2GetBlkioDeviceWeight,
 };
 
 
-- 
2.22.0