bury struct proc_ns in fs/proc

a) make get_proc_ns() return a pointer to struct ns_common
b) mirror ns_ops in dentry->d_fsdata of ns dentries, so that
is_mnt_ns_file() could get away with fewer dereferences.

That way struct proc_ns becomes invisible outside of fs/proc/*.c

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 1 insertions, 3 deletions

diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index 87c37221cb7f..49746c81ad8d 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -222,7 +222,6 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
 {
         struct task_struct *tsk = current;
         struct nsproxy *new_nsproxy;
-        struct proc_ns *ei;
         struct file *file;
         struct ns_common *ns;
         int err;
@@ -232,8 +231,7 @@ SYSCALL_DEFINE2(setns, int, fd, int, nstype)
                 return PTR_ERR(file);
 
         err = -EINVAL;
-        ei = get_proc_ns(file_inode(file));
-        ns = ei->ns;
+        ns = get_proc_ns(file_inode(file));
         if (nstype && (ns->ops->type != nstype))
                 goto out;