X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=include%2Flinux%2Fmnt_namespace.h;fp=include%2Flinux%2Fmnt_namespace.h;h=4af0b1fc282afbd9c8206d9e859f53b65bd29271;hb=76828883507a47dae78837ab5dec5a5b4513c667;hp=0000000000000000000000000000000000000000;hpb=64ba3f394c830ec48a1c31b53dcae312c56f1604;p=linux-2.6.git

diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h
new file mode 100644
index 000000000..4af0b1fc2
--- /dev/null
+++ b/include/linux/mnt_namespace.h
@@ -0,0 +1,42 @@
+#ifndef _NAMESPACE_H_
+#define _NAMESPACE_H_
+#ifdef __KERNEL__
+
+#include <linux/mount.h>
+#include <linux/sched.h>
+#include <linux/nsproxy.h>
+
+struct mnt_namespace {
+	atomic_t		count;
+	struct vfsmount *	root;
+	struct list_head	list;
+	wait_queue_head_t poll;
+	int event;
+};
+
+extern int copy_mnt_ns(int, struct task_struct *);
+extern void __put_mnt_ns(struct mnt_namespace *ns);
+extern struct mnt_namespace *dup_mnt_ns(struct task_struct *,
+		struct fs_struct *);
+
+static inline void put_mnt_ns(struct mnt_namespace *ns)
+{
+	if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
+		/* releases vfsmount_lock */
+		__put_mnt_ns(ns);
+}
+
+static inline void exit_mnt_ns(struct task_struct *p)
+{
+	struct mnt_namespace *ns = p->nsproxy->mnt_ns;
+	if (ns)
+		put_mnt_ns(ns);
+}
+
+static inline void get_mnt_ns(struct mnt_namespace *ns)
+{
+	atomic_inc(&ns->count);
+}
+
+#endif
+#endif