Unverified Commit 58f976d4 authored by Christian Brauner's avatar Christian Brauner
Browse files

uts: support ns lookup 



Support the generic ns lookup infrastructure to support file handles for
namespaces.

Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 2f5243cb

kernel/utsname.c

+6 −1
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/cred.h>

#include <linux/user_namespace.h>

#include <linux/proc_ns.h>

#include <linux/nstree.h>

#include <linux/sched/task.h>



static struct kmem_cache *uts_ns_cache __ro_after_init;
@@ -58,6 +59,7 @@ static struct uts_namespace *clone_uts_ns(struct user_namespace *user_ns, 
	memcpy(&ns->name, &old_ns->name, sizeof(ns->name));

	ns->user_ns = get_user_ns(user_ns);

	up_read(&uts_sem);

	ns_tree_add(ns);

	return ns;



fail_free:
@@ -93,10 +95,12 @@ struct uts_namespace *copy_utsname(unsigned long flags, 


void free_uts_ns(struct uts_namespace *ns)

{

	ns_tree_remove(ns);

	dec_uts_namespaces(ns->ucounts);

	put_user_ns(ns->user_ns);

	ns_free_inum(&ns->ns);

	kmem_cache_free(uts_ns_cache, ns);

	/* Concurrent nstree traversal depends on a grace period. */

	kfree_rcu(ns, ns.ns_rcu);

}



static inline struct uts_namespace *to_uts_ns(struct ns_common *ns)
@@ -162,4 +166,5 @@ void __init uts_ns_init(void) 
			offsetof(struct uts_namespace, name),

			sizeof_field(struct uts_namespace, name),

			NULL);

	ns_tree_add(&init_uts_ns);

}