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