namespaces: cleanup the code managed with the USER_NS option

Make the user_namespace.o compilation depend on this option and move the
init_user_ns into user.c file to make the kernel compile and work without the
namespaces support.  This make the user namespace code be organized similar to
other namespaces'.

Also mask the USER_NS option as "depend on NAMESPACES".

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Herbert Poetzl <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Cc: Sukadev Bhattiprolu <sukadev@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Pavel Emelyanov 2008-02-08 04:18:23 -08:00 committed by Linus Torvalds
parent ae5e1b22f1
commit aee16ce73c
4 changed files with 21 additions and 24 deletions

View file

@ -214,15 +214,6 @@ config TASK_IO_ACCOUNTING
Say N if unsure.
config USER_NS
bool "User Namespaces (EXPERIMENTAL)"
default n
depends on EXPERIMENTAL
help
Support user namespaces. This allows containers, i.e.
vservers, to use user namespaces to provide different
user info for different servers. If unsure, say N.
config PID_NS
bool "PID Namespaces (EXPERIMENTAL)"
default n
@ -443,6 +434,14 @@ config IPC_NS
In this namespace tasks work with IPC ids which correspond to
different IPC objects in different namespaces
config USER_NS
bool "User namespace (EXPERIMENTAL)"
depends on NAMESPACES && EXPERIMENTAL
help
This allows containers, i.e. vservers, to use user namespaces
to provide different user info for different servers.
If unsure, say N.
config BLK_DEV_INITRD
bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
depends on BROKEN || !FRV

View file

@ -4,7 +4,7 @@
obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
exit.o itimer.o time.o softirq.o resource.o \
sysctl.o capability.o ptrace.o timer.o user.o user_namespace.o \
sysctl.o capability.o ptrace.o timer.o user.o \
signal.o sys.o kmod.o workqueue.o pid.o \
rcupdate.o extable.o params.o posix-timers.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
@ -33,7 +33,6 @@ obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
obj-$(CONFIG_UID16) += uid16.o
obj-$(CONFIG_MODULES) += module.o
obj-$(CONFIG_KALLSYMS) += kallsyms.o
obj-$(CONFIG_UTS_NS) += utsname.o
obj-$(CONFIG_PM) += power/
obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
obj-$(CONFIG_KEXEC) += kexec.o
@ -43,6 +42,8 @@ obj-$(CONFIG_CGROUPS) += cgroup.o
obj-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
obj-$(CONFIG_CPUSETS) += cpuset.o
obj-$(CONFIG_CGROUP_NS) += ns_cgroup.o
obj-$(CONFIG_UTS_NS) += utsname.o
obj-$(CONFIG_USER_NS) += user_namespace.o
obj-$(CONFIG_IKCONFIG) += configs.o
obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
obj-$(CONFIG_STOP_MACHINE) += stop_machine.o

View file

@ -17,6 +17,14 @@
#include <linux/module.h>
#include <linux/user_namespace.h>
struct user_namespace init_user_ns = {
.kref = {
.refcount = ATOMIC_INIT(2),
},
.root_user = &root_user,
};
EXPORT_SYMBOL_GPL(init_user_ns);
/*
* UID task count cache, to get fast user lookup in "alloc_uid"
* when changing user ID's (ie setuid() and friends).
@ -427,6 +435,7 @@ void switch_uid(struct user_struct *new_user)
suid_keys(current);
}
#ifdef CONFIG_USER_NS
void release_uids(struct user_namespace *ns)
{
int i;
@ -451,6 +460,7 @@ void release_uids(struct user_namespace *ns)
free_uid(ns->root_user);
}
#endif
static int __init uid_cache_init(void)
{

View file

@ -10,17 +10,6 @@
#include <linux/nsproxy.h>
#include <linux/user_namespace.h>
struct user_namespace init_user_ns = {
.kref = {
.refcount = ATOMIC_INIT(2),
},
.root_user = &root_user,
};
EXPORT_SYMBOL_GPL(init_user_ns);
#ifdef CONFIG_USER_NS
/*
* Clone a new ns copying an original user ns, setting refcount to 1
* @old_ns: namespace to clone
@ -84,5 +73,3 @@ void free_user_ns(struct kref *kref)
release_uids(ns);
kfree(ns);
}
#endif /* CONFIG_USER_NS */