diff options
Diffstat (limited to 'include/linux/mnt_namespace.h')
| -rw-r--r-- | include/linux/mnt_namespace.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h new file mode 100644 index 000000000000..4af0b1fc282a --- /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 |