add a kmem_cache for nsproxy objects (98c0d07c) · Commits · 戴 / test

kernel/nsproxy.c

+17 −4

Original line number	Diff line number	Diff line
		@@ -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);