From 07543f5c75cee744b791cf7716c69571486fe753 Mon Sep 17 00:00:00 2001 From: Pavel Emelyanov Date: Thu, 18 Oct 2007 23:40:08 -0700 Subject: pid namespaces: make proc have multiple superblocks - one for each namespace Each pid namespace have to be visible through its own proc mount. Thus we need to have per-namespace proc trees with their own superblocks. We cannot easily show different pid namespace via one global proc tree, since each pid refers to different tasks in different namespaces. E.g. pid 1 refers to the init task in the initial namespace and to some other task when seeing from another namespace. Moreover - pid, exisintg in one namespace may not exist in the other. This approach has one move advantage is that the tasks from the init namespace can see what tasks live in another namespace by reading entries from another proc tree. Signed-off-by: Pavel Emelyanov Cc: Oleg Nesterov Cc: Sukadev Bhattiprolu Cc: Paul Menage Cc: "Eric W. Biederman" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/pid_namespace.h | 3 +++ include/linux/proc_fs.h | 3 ++- 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h index 14376ebf4bac..416d4e4ce94e 100644 --- a/include/linux/pid_namespace.h +++ b/include/linux/pid_namespace.h @@ -23,6 +23,9 @@ struct pid_namespace { struct kmem_cache *pid_cachep; int level; struct pid_namespace *parent; +#ifdef CONFIG_PROC_FS + struct vfsmount *proc_mnt; +#endif }; extern struct pid_namespace init_pid_ns; diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h index dbd601c7244c..cbc1038c7900 100644 --- a/include/linux/proc_fs.h +++ b/include/linux/proc_fs.h @@ -125,7 +125,8 @@ extern struct proc_dir_entry *create_proc_entry(const char *name, mode_t mode, extern void remove_proc_entry(const char *name, struct proc_dir_entry *parent); extern struct vfsmount *proc_mnt; -extern int proc_fill_super(struct super_block *,void *,int); +struct pid_namespace; +extern int proc_fill_super(struct super_block *); extern struct inode *proc_get_inode(struct super_block *, unsigned int, struct proc_dir_entry *); /* -- cgit v1.2.3