[libvirt] [PATCH 07/19] vircgroup: introduce virCgroupV2DeviceReallocMap
This function will create a new BPF map and copy all existing rules from
old BPF map. There is no way how to reallocate existing BPF map so we
need to create a new copy if we run out of space in current BPF map.
Signed-off-by: Pavel Hrdina <phrdina(a)redhat.com>
---
src/util/vircgroupv2.c | 43 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/src/util/vircgroupv2.c b/src/util/vircgroupv2.c
index ae9aafd9a4..d70eefd92f 100644
--- a/src/util/vircgroupv2.c
+++ b/src/util/vircgroupv2.c
@@ -1846,6 +1846,49 @@ virCgroupV2DeviceCreateMap(size_t size)
}
+static int
+virCgroupV2DeviceReallocMap(int mapfd,
+ size_t size)
+{
+ __u64 key = 0;
+ __u64 prevKey = 0;
+ int rc;
+ int newmapfd = virCgroupV2DeviceCreateMap(size);
+
+ VIR_DEBUG("realloc devices map mapfd:%d, size:%lu", mapfd, size);
+
+ if (newmapfd < 0)
+ return -1;
+
+ while ((rc = virBPFGetNextElem(mapfd, &prevKey, &key)) == 0) {
+ __u32 val = 0;
+
+ if (virBPFLookupElem(mapfd, &key, &val) < 0) {
+ virReportSystemError(errno, "%s",
+ _("failed to lookup device in old map"));
+ goto error;
+ }
+
+ if (virBPFUpdateElem(newmapfd, &key, &val) < 0) {
+ virReportSystemError(errno, "%s",
+ _("failed to add device into new map"));
+ goto error;
+ }
+
+ prevKey = key;
+ }
+
+ if (rc < 0)
+ goto error;
+
+ return newmapfd;
+
+ error:
+ VIR_FORCE_CLOSE(newmapfd);
+ return -1;
+}
+
+
static int
virCgroupV2DeviceCreateProg(virCgroupPtr group)
{
--
2.20.1