proc: Split the namespace stuff out into linux/proc_ns.h

Split the proc namespace stuff out into linux/proc_ns.h.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: netdev@vger.kernel.org
cc: Serge E. Hallyn <serge.hallyn@ubuntu.com>
cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

3 files changed, 18 insertions, 13 deletions

diff --git a/fs/namespace.c b/fs/namespace.c
index ed0708f..0f0cf93 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -21,7 +21,7 @@
 #include <linux/fs_struct.h>	/* get_fs_root et.al. */
 #include <linux/fsnotify.h>	/* fsnotify_vfsmount_delete */
 #include <linux/uaccess.h>
-#include <linux/proc_fs.h>
+#include <linux/proc_ns.h>
 #include "pnode.h"
 #include "internal.h"
 
@@ -1350,13 +1350,13 @@ static bool mnt_ns_loop(struct path *path)
 	 * mount namespace loop?
 	 */
 	struct inode *inode = path->dentry->d_inode;
-	struct proc_inode *ei;
+	struct proc_ns *ei;
 	struct mnt_namespace *mnt_ns;
 
 	if (!proc_ns_inode(inode))
 		return false;
 
-	ei = PROC_I(inode);
+	ei = get_proc_ns(inode);
 	if (ei->ns_ops != &mntns_operations)
 		return false;
 
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index bd2f764..073aea60 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -51,8 +51,8 @@ static void proc_evict_inode(struct inode *inode)
 		sysctl_head_put(head);
 	}
 	/* Release any associated namespace */
-	ns_ops = PROC_I(inode)->ns_ops;
-	ns = PROC_I(inode)->ns;
+	ns_ops = PROC_I(inode)->ns.ns_ops;
+	ns = PROC_I(inode)->ns.ns;
 	if (ns_ops && ns)
 		ns_ops->put(ns);
 }
@@ -73,8 +73,8 @@ static struct inode *proc_alloc_inode(struct super_block *sb)
 	ei->pde = NULL;
 	ei->sysctl = NULL;
 	ei->sysctl_entry = NULL;
-	ei->ns = NULL;
-	ei->ns_ops = NULL;
+	ei->ns.ns = NULL;
+	ei->ns.ns_ops = NULL;
 	inode = &ei->vfs_inode;
 	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
 	return inode;
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 66b51c0..54bdc67 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -51,7 +51,7 @@ static int ns_delete_dentry(const struct dentry *dentry)
 static char *ns_dname(struct dentry *dentry, char *buffer, int buflen)
 {
 	struct inode *inode = dentry->d_inode;
-	const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns_ops;
+	const struct proc_ns_operations *ns_ops = PROC_I(inode)->ns.ns_ops;
 
 	return dynamic_dname(dentry, buffer, buflen, "%s:[%lu]",
 		ns_ops->name, inode->i_ino);
@@ -95,8 +95,8 @@ static struct dentry *proc_ns_get_dentry(struct super_block *sb,
 		inode->i_op = &ns_inode_operations;
 		inode->i_mode = S_IFREG | S_IRUGO;
 		inode->i_fop = &ns_file_operations;
-		ei->ns_ops = ns_ops;
-		ei->ns = ns;
+		ei->ns.ns_ops = ns_ops;
+		ei->ns.ns = ns;
 		unlock_new_inode(inode);
 	} else {
 		ns_ops->put(ns);
@@ -128,7 +128,7 @@ static void *proc_ns_follow_link(struct dentry *dentry, struct nameidata *nd)
 	if (!ptrace_may_access(task, PTRACE_MODE_READ))
 		goto out_put_task;
 
-	ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns_ops);
+	ns_path.dentry = proc_ns_get_dentry(sb, task, ei->ns.ns_ops);
 	if (IS_ERR(ns_path.dentry)) {
 		error = ERR_CAST(ns_path.dentry);
 		goto out_put_task;
@@ -148,7 +148,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
 {
 	struct inode *inode = dentry->d_inode;
 	struct proc_inode *ei = PROC_I(inode);
-	const struct proc_ns_operations *ns_ops = ei->ns_ops;
+	const struct proc_ns_operations *ns_ops = ei->ns.ns_ops;
 	struct task_struct *task;
 	void *ns;
 	char name[50];
@@ -202,7 +202,7 @@ static struct dentry *proc_ns_instantiate(struct inode *dir,
 	ei = PROC_I(inode);
 	inode->i_mode = S_IFLNK|S_IRWXUGO;
 	inode->i_op = &proc_ns_link_inode_operations;
-	ei->ns_ops = ns_ops;
+	ei->ns.ns_ops = ns_ops;
 
 	d_set_d_op(dentry, &pid_dentry_operations);
 	d_add(dentry, inode);
@@ -337,6 +337,11 @@ out_invalid:
 	return ERR_PTR(-EINVAL);
 }
 
+struct proc_ns *get_proc_ns(struct inode *inode)
+{
+	return &PROC_I(inode)->ns;
+}
+
 bool proc_ns_inode(struct inode *inode)
 {
 	return inode->i_fop == &ns_file_operations;