From eca0f75e6f67ec9e445b90685143992b6929cef0 Mon Sep 17 00:00:00 2001

Message-Id: <eca0f75e6f67ec9e445b90685143992b6929cef0@dist-git>

From: Pavel Hrdina <phrdina@redhat.com>

Date: Mon, 1 Jul 2019 17:07:36 +0200

Subject: [PATCH] vircgroup: introduce virCgroupV2(Set|Get)BlkioDeviceWriteIops

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Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

(cherry picked from commit 438587033bdaf714238a98703c9efc7b0dada51f)

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

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>

Message-Id: <7937bd2aa5da315f8351e3f312f5aee71b682c30.1561993100.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 8cecc43f76..1d25c0ae1f 100644

--- a/src/util/vircgroupv2.c

+++ b/src/util/vircgroupv2.c

@@ -811,6 +811,74 @@ virCgroupV2GetBlkioDeviceReadIops(virCgroupPtr group,

 }

+static int

+virCgroupV2SetBlkioDeviceWriteIops(virCgroupPtr group,

+                                   const char *path,

+                                   unsigned int wiops)

+{

+    VIR_AUTOFREE(char *) str = NULL;

+    VIR_AUTOFREE(char *) blkstr = NULL;

+

+    if (!(blkstr = virCgroupGetBlockDevString(path)))

+        return -1;

+

+    if (wiops == 0) {

+        if (virAsprintf(&str, "%swiops=max", blkstr) < 0)

+            return -1;

+    } else {

+        if (virAsprintf(&str, "%swiops=%u", blkstr, wiops) < 0)

+            return -1;

+    }

+

+    return virCgroupSetValueStr(group,

+                                VIR_CGROUP_CONTROLLER_BLKIO,

+                                "io.max",

+                                str);

+}

+

+

+static int

+virCgroupV2GetBlkioDeviceWriteIops(virCgroupPtr group,

+                                   const char *path,

+                                   unsigned int *wiops)

+{

+    VIR_AUTOFREE(char *) str = NULL;

+    const char *name = "wiops=";

+    char *tmp;

+

+    if (virCgroupGetValueForBlkDev(group,

+                                   VIR_CGROUP_CONTROLLER_BLKIO,

+                                   "io.max",

+                                   path,

+                                   &str) < 0) {

+        return -1;

+    }

+

+    if (!str) {

+        *wiops = 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)) {

+            *wiops = 0;

+        } else if (virStrToLong_ui(tmp, NULL, 10, wiops) < 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,

@@ -841,6 +909,8 @@ virCgroupBackend virCgroupV2Backend = {

     .getBlkioDeviceWeight = virCgroupV2GetBlkioDeviceWeight,

     .setBlkioDeviceReadIops = virCgroupV2SetBlkioDeviceReadIops,

     .getBlkioDeviceReadIops = virCgroupV2GetBlkioDeviceReadIops,

+    .setBlkioDeviceWriteIops = virCgroupV2SetBlkioDeviceWriteIops,

+    .getBlkioDeviceWriteIops = virCgroupV2GetBlkioDeviceWriteIops,

 };

-- 

2.22.0