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authorPavel Emelyanov <xemul@openvz.org>2008-02-08 04:18:21 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:23 -0800
commit58bfdd6deeec02b73691ea2c951a3c5d743bca63 (patch)
tree8f46771858dee87080b0ed64bc176b25c239f3b1
parentc5289a69491f2b597e22d0456b46cc043deedbd8 (diff)
downloadlinux-linaro-stable-58bfdd6deeec02b73691ea2c951a3c5d743bca63.tar.gz
namespaces: move the UTS namespace under UTS_NS option
Currently all the namespace management code is in the kernel/utsname.c file, so just compile it out and make stubs in the appropriate header. The init namespace itself is in init/version.c and is in the kernel all the time. 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>
-rw-r--r--include/linux/utsname.h21
-rw-r--r--init/Kconfig7
-rw-r--r--kernel/Makefile3
3 files changed, 30 insertions, 1 deletions
diff --git a/include/linux/utsname.h b/include/linux/utsname.h
index 923db99175f2..11232676bfff 100644
--- a/include/linux/utsname.h
+++ b/include/linux/utsname.h
@@ -35,6 +35,7 @@ struct new_utsname {
#include <linux/sched.h>
#include <linux/kref.h>
#include <linux/nsproxy.h>
+#include <linux/err.h>
#include <asm/atomic.h>
struct uts_namespace {
@@ -43,6 +44,7 @@ struct uts_namespace {
};
extern struct uts_namespace init_uts_ns;
+#ifdef CONFIG_UTS_NS
static inline void get_uts_ns(struct uts_namespace *ns)
{
kref_get(&ns->kref);
@@ -56,6 +58,25 @@ static inline void put_uts_ns(struct uts_namespace *ns)
{
kref_put(&ns->kref, free_uts_ns);
}
+#else
+static inline void get_uts_ns(struct uts_namespace *ns)
+{
+}
+
+static inline void put_uts_ns(struct uts_namespace *ns)
+{
+}
+
+static inline struct uts_namespace *copy_utsname(unsigned long flags,
+ struct uts_namespace *ns)
+{
+ if (flags & CLONE_NEWUTS)
+ return ERR_PTR(-EINVAL);
+
+ return ns;
+}
+#endif
+
static inline struct new_utsname *utsname(void)
{
return &current->nsproxy->uts_ns->name;
diff --git a/init/Kconfig b/init/Kconfig
index 7654207961a2..fef641af78c2 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -429,6 +429,13 @@ config NAMESPACES
or same user id or pid may refer to different tasks when used in
different namespaces.
+config UTS_NS
+ bool "UTS namespace"
+ depends on NAMESPACES
+ help
+ In this namespace tasks see different info provided with the
+ uname() system call
+
config BLK_DEV_INITRD
bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
depends on BROKEN || !FRV
diff --git a/kernel/Makefile b/kernel/Makefile
index 685697c0a181..0f15bd409367 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -9,7 +9,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.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 \
hrtimer.o rwsem.o nsproxy.o srcu.o \
- utsname.o notifier.o ksysfs.o pm_qos_params.o
+ notifier.o ksysfs.o pm_qos_params.o
obj-$(CONFIG_SYSCTL) += sysctl_check.o
obj-$(CONFIG_STACKTRACE) += stacktrace.o
@@ -33,6 +33,7 @@ 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