From b5ce0e989440de2c3d4bfb8b325d85ca25ace4ca Mon Sep 17 00:00:00 2001
Message-Id: <b5ce0e989440de2c3d4bfb8b325d85ca25ace4ca@dist-git>
From: Pavel Hrdina <phrdina@redhat.com>
Date: Mon, 1 Jul 2019 17:07:38 +0200
Subject: [PATCH] vircgroup: introduce virCgroupV2(Set|Get)BlkioDeviceWriteBps
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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
(cherry picked from commit 91756fb64a370e48a6bcdd1973126a8c7a36e4f7)

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

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Message-Id: <3d70ebb985fa8132e45ba12bbb8e78ac80557a78.1561993100.git.phrdina@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
---
 src/util/vircgroupv2.c | 70 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index b303e9cb10..52d31925c2 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -947,6 +947,74 @@ virCgroupV2GetBlkioDeviceReadBps(virCgroupPtr group,
 }
 
 
+static int
+virCgroupV2SetBlkioDeviceWriteBps(virCgroupPtr group,
+                                  const char *path,
+                                  unsigned long long wbps)
+{
+    VIR_AUTOFREE(char *) str = NULL;
+    VIR_AUTOFREE(char *) blkstr = NULL;
+
+    if (!(blkstr = virCgroupGetBlockDevString(path)))
+        return -1;
+
+    if (wbps == 0) {
+        if (virAsprintf(&str, "%swbps=max", blkstr) < 0)
+            return -1;
+    } else {
+        if (virAsprintf(&str, "%swbps=%llu", blkstr, wbps) < 0)
+            return -1;
+    }
+
+    return virCgroupSetValueStr(group,
+                                VIR_CGROUP_CONTROLLER_BLKIO,
+                                "io.max",
+                                str);
+}
+
+
+static int
+virCgroupV2GetBlkioDeviceWriteBps(virCgroupPtr group,
+                                  const char *path,
+                                  unsigned long long *wbps)
+{
+    VIR_AUTOFREE(char *) str = NULL;
+    const char *name = "wbps=";
+    char *tmp;
+
+    if (virCgroupGetValueForBlkDev(group,
+                                   VIR_CGROUP_CONTROLLER_BLKIO,
+                                   "io.max",
+                                   path,
+                                   &str) < 0) {
+        return -1;
+    }
+
+    if (!str) {
+        *wbps = 0;
+    } else {
+        if (!(tmp = strstr(str, name))) {
+            virReportError(VIR_ERR_INTERNAL_ERROR,
+                           _("Unable to find '%s' limit for block device '%s'"),
+                           name, path);
+            return -1;
+        }
+        tmp += strlen(name);
+
+        if (STREQLEN(tmp, "max", 3)) {
+            *wbps = 0;
+        } else if (virStrToLong_ull(tmp, NULL, 10, wbps) < 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,
 
@@ -981,6 +1049,8 @@ virCgroupBackend virCgroupV2Backend = {
     .getBlkioDeviceWriteIops = virCgroupV2GetBlkioDeviceWriteIops,
     .setBlkioDeviceReadBps = virCgroupV2SetBlkioDeviceReadBps,
     .getBlkioDeviceReadBps = virCgroupV2GetBlkioDeviceReadBps,
+    .setBlkioDeviceWriteBps = virCgroupV2SetBlkioDeviceWriteBps,
+    .getBlkioDeviceWriteBps = virCgroupV2GetBlkioDeviceWriteBps,
 };
 
 
-- 
2.22.0