1 files changed, 33 insertions, 41 deletions

diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index a34195e92b20..0f1692e63cb6 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -11,6 +11,7 @@
 
 #include <linux/proc_fs.h>
 #include <linux/proc_ns.h>
+#include <linux/refcount.h>
 #include <linux/spinlock.h>
 #include <linux/atomic.h>
 #include <linux/binfmts.h>
@@ -31,28 +32,41 @@ struct mempolicy;
  * subdir_node is used to build the rb tree "subdir" of the parent.
  */
 struct proc_dir_entry {
+	/*
+	 * number of callers into module in progress;
+	 * negative -> it's going away RSN
+	 */
+	atomic_t in_use;
+	refcount_t refcnt;
+	struct list_head pde_openers;	/* who did ->open, but not ->release */
+	/* protects ->pde_openers and all struct pde_opener instances */
+	spinlock_t pde_unload_lock;
+	struct completion *pde_unload_completion;
+	const struct inode_operations *proc_iops;
+	const struct file_operations *proc_fops;
+	void *data;
 	unsigned int low_ino;
-	umode_t mode;
 	nlink_t nlink;
 	kuid_t uid;
 	kgid_t gid;
 	loff_t size;
-	const struct inode_operations *proc_iops;
-	const struct file_operations *proc_fops;
 	struct proc_dir_entry *parent;
-	struct rb_root_cached subdir;
+	struct rb_root subdir;
 	struct rb_node subdir_node;
-	void *data;
-	atomic_t count;		/* use count */
-	atomic_t in_use;	/* number of callers into module in progress; */
-			/* negative -> it's going away RSN */
-	struct completion *pde_unload_completion;
-	struct list_head pde_openers;	/* who did ->open, but not ->release */
-	spinlock_t pde_unload_lock; /* proc_fops checks and pde_users bumps */
+	char *name;
+	umode_t mode;
 	u8 namelen;
-	char name[];
+#ifdef CONFIG_64BIT
+#define SIZEOF_PDE_INLINE_NAME	(192-139)
+#else
+#define SIZEOF_PDE_INLINE_NAME	(128-87)
+#endif
+	char inline_name[SIZEOF_PDE_INLINE_NAME];
 } __randomize_layout;
 
+extern struct kmem_cache *proc_dir_entry_cache;
+void pde_free(struct proc_dir_entry *pde);
+
 union proc_op {
 	int (*proc_get_link)(struct dentry *, struct path *);
 	int (*proc_show)(struct seq_file *m,
@@ -100,31 +114,10 @@ static inline struct task_struct *get_proc_task(struct inode *inode)
 	return get_pid_task(proc_pid(inode), PIDTYPE_PID);
 }
 
-void task_dump_owner(struct task_struct *task, mode_t mode,
+void task_dump_owner(struct task_struct *task, umode_t mode,
 		     kuid_t *ruid, kgid_t *rgid);
 
-static inline unsigned name_to_int(const struct qstr *qstr)
-{
-	const char *name = qstr->name;
-	int len = qstr->len;
-	unsigned n = 0;
-
-	if (len > 1 && *name == '0')
-		goto out;
-	while (len-- > 0) {
-		unsigned c = *name++ - '0';
-		if (c > 9)
-			goto out;
-		if (n >= (~0U-9)/10)
-			goto out;
-		n *= 10;
-		n += c;
-	}
-	return n;
-out:
-	return ~0U;
-}
-
+unsigned name_to_int(const struct qstr *qstr);
 /*
  * Offset of the first process in the /proc root directory..
  */
@@ -170,14 +163,13 @@ extern bool proc_fill_cache(struct file *, struct dir_context *, const char *, i
  * generic.c
  */
 extern struct dentry *proc_lookup(struct inode *, struct dentry *, unsigned int);
-extern struct dentry *proc_lookup_de(struct proc_dir_entry *, struct inode *,
-				     struct dentry *);
+struct dentry *proc_lookup_de(struct inode *, struct dentry *, struct proc_dir_entry *);
 extern int proc_readdir(struct file *, struct dir_context *);
-extern int proc_readdir_de(struct proc_dir_entry *, struct file *, struct dir_context *);
+int proc_readdir_de(struct file *, struct dir_context *, struct proc_dir_entry *);
 
 static inline struct proc_dir_entry *pde_get(struct proc_dir_entry *pde)
 {
-	atomic_inc(&pde->count);
+	refcount_inc(&pde->refcnt);
 	return pde;
 }
 extern void pde_put(struct proc_dir_entry *);
@@ -195,12 +187,12 @@ struct pde_opener {
 	struct list_head lh;
 	bool closing;
 	struct completion *c;
-};
+} __randomize_layout;
 extern const struct inode_operations proc_link_inode_operations;
 
 extern const struct inode_operations proc_pid_link_inode_operations;
 
-extern void proc_init_inodecache(void);
+void proc_init_kmemcache(void);
 void set_proc_pid_nlink(void);
 extern struct inode *proc_get_inode(struct super_block *, struct proc_dir_entry *);
 extern int proc_fill_super(struct super_block *, void *data, int flags);