proc: Make the PROC_I() and PDE() macros internal to procfs

Make the PROC_I() and PDE() macros internal to procfs.  This means making
PDE_DATA() out of line.  This could be made more optimal by storing
PDE()->data into inode->i_private.

Also provide a __PDE_DATA() that is inline and internal to procfs.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/proc/generic.c

@@ -165,7 +165,7 @@ void proc_free_inum(unsigned int inum)
 
 static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
-	nd_set_link(nd, PDE_DATA(dentry->d_inode));
+	nd_set_link(nd, __PDE_DATA(dentry->d_inode));
 	return NULL;
 }
 
@@ -631,3 +631,9 @@ void proc_remove(struct proc_dir_entry *de)
 		remove_proc_subtree(de->name, de->parent);
 }
 EXPORT_SYMBOL(proc_remove);
+
+void *PDE_DATA(const struct inode *inode)
+{
+	return __PDE_DATA(inode);
+}
+EXPORT_SYMBOL(PDE_DATA);

fs/proc/internal.h

@@ -84,6 +84,24 @@ struct proc_maps_private {
 
 void proc_init_inodecache(void);
 
+/*
+ * General functions
+ */
+static inline struct proc_inode *PROC_I(const struct inode *inode)
+{
+	return container_of(inode, struct proc_inode, vfs_inode);
+}
+
+static inline struct proc_dir_entry *PDE(const struct inode *inode)
+{
+	return PROC_I(inode)->pde;
+}
+
+static inline void *__PDE_DATA(const struct inode *inode)
+{
+	return PDE(inode)->data;
+}
+
 static inline struct pid *proc_pid(struct inode *inode)
 {
 	return PROC_I(inode)->pid;

fs/proc/proc_devtree.c

@@ -41,7 +41,7 @@ static int property_proc_show(struct seq_file *m, void *v)
 
 static int property_proc_open(struct inode *inode, struct file *file)
 {
-	return single_open(file, property_proc_show, PDE_DATA(inode));
+	return single_open(file, property_proc_show, __PDE_DATA(inode));
 }
 
 static const struct file_operations property_proc_fops = {

include/linux/proc_fs.h

@@ -87,6 +87,7 @@ static inline struct proc_dir_entry *proc_create(const char *name, umode_t mode,
  
 extern void proc_set_size(struct proc_dir_entry *, loff_t);
 extern void proc_set_user(struct proc_dir_entry *, kuid_t, kgid_t);
+extern void *PDE_DATA(const struct inode *);
 extern void *proc_get_parent_data(const struct inode *);
 #else
 
@@ -116,6 +117,7 @@ static inline struct proc_dir_entry *proc_mkdir_mode(const char *name,
 	umode_t mode, struct proc_dir_entry *parent) { return NULL; }
 static inline void proc_set_size(struct proc_dir_entry *de, loff_t size) {}
 static inline void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) {}
+static inline void *PDE_DATA(const struct inode *inode) {BUG(); return NULL;}
 
 #endif /* CONFIG_PROC_FS */
 
@@ -142,21 +144,6 @@ struct proc_inode {
 	struct inode vfs_inode;
 };
 
-static inline struct proc_inode *PROC_I(const struct inode *inode)
-{
-	return container_of(inode, struct proc_inode, vfs_inode);
-}
-
-static inline struct proc_dir_entry *PDE(const struct inode *inode)
-{
-	return PROC_I(inode)->pde;
-}
-
-static inline void *PDE_DATA(const struct inode *inode)
-{
-	return PROC_I(inode)->pde->data;
-}
-
 static inline struct proc_dir_entry *proc_net_mkdir(
 	struct net *net, const char *name, struct proc_dir_entry *parent)
 {