proc: Usable inode numbers for the namespace file descriptors.

[firefly-linux-kernel-4.4.55.git] / kernel / pid_namespace.c

diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c
index 68508d330634485b2308d87932365eb1f3e6a14b..560da0dab230aab631dab7003597815fc4d21c6b 100644 (file)
--- a/kernel/pid_namespace.c
+++ b/kernel/pid_namespace.c
@@ -107,6 +107,10 @@ static struct pid_namespace *create_pid_namespace(struct user_namespace *user_ns
        if (ns->pid_cachep == NULL)
                goto out_free_map;
 
+       err = proc_alloc_inum(&ns->proc_inum);
+       if (err)
+               goto out_free_map;
+
        kref_init(&ns->kref);
        ns->level = level;
        ns->parent = get_pid_ns(parent_pid_ns);
@@ -133,6 +137,7 @@ static void destroy_pid_namespace(struct pid_namespace *ns)
 {
        int i;
 
+       proc_free_inum(ns->proc_inum);
        for (i = 0; i < PIDMAP_ENTRIES; i++)
                kfree(ns->pidmap[i].page);
        put_user_ns(ns->user_ns);
@@ -345,12 +350,19 @@ static int pidns_install(struct nsproxy *nsproxy, void *ns)
        return 0;
 }
 
+static unsigned int pidns_inum(void *ns)
+{
+       struct pid_namespace *pid_ns = ns;
+       return pid_ns->proc_inum;
+}
+
 const struct proc_ns_operations pidns_operations = {
        .name           = "pid",
        .type           = CLONE_NEWPID,
        .get            = pidns_get,
        .put            = pidns_put,
        .install        = pidns_install,
+       .inum           = pidns_inum,
 };
 
 static __init int pid_namespaces_init(void)