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-rw-r--r--kernel/nsproxy.c21
1 files changed, 17 insertions, 4 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 15a6015a849..4b7fcc8f9a4 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -21,6 +21,8 @@
#include <linux/utsname.h>
#include <linux/pid_namespace.h>
+static struct kmem_cache *nsproxy_cachep;
+
struct nsproxy init_nsproxy = INIT_NSPROXY(init_nsproxy);
static inline void get_nsproxy(struct nsproxy *ns)
@@ -43,9 +45,11 @@ static inline struct nsproxy *clone_nsproxy(struct nsproxy *orig)
{
struct nsproxy *ns;
- ns = kmemdup(orig, sizeof(struct nsproxy), GFP_KERNEL);
- if (ns)
+ ns = kmem_cache_alloc(nsproxy_cachep, GFP_KERNEL);
+ if (ns) {
+ memcpy(ns, orig, sizeof(struct nsproxy));
atomic_set(&ns->count, 1);
+ }
return ns;
}
@@ -109,7 +113,7 @@ out_uts:
if (new_nsp->mnt_ns)
put_mnt_ns(new_nsp->mnt_ns);
out_ns:
- kfree(new_nsp);
+ kmem_cache_free(nsproxy_cachep, new_nsp);
return ERR_PTR(err);
}
@@ -160,7 +164,7 @@ void free_nsproxy(struct nsproxy *ns)
put_pid_ns(ns->pid_ns);
if (ns->user_ns)
put_user_ns(ns->user_ns);
- kfree(ns);
+ kmem_cache_free(nsproxy_cachep, ns);
}
/*
@@ -185,3 +189,12 @@ int unshare_nsproxy_namespaces(unsigned long unshare_flags,
err = PTR_ERR(*new_nsp);
return err;
}
+
+static int __init nsproxy_cache_init(void)
+{
+ nsproxy_cachep = kmem_cache_create("nsproxy", sizeof(struct nsproxy),
+ 0, SLAB_PANIC, NULL, NULL);
+ return 0;
+}
+
+module_init(nsproxy_cache_init);