1 files changed, 46 insertions, 3 deletions

diff --git a/include/linux/debugfs.h b/include/linux/debugfs.h
index 981e53ab84e8..1438e2322d5c 100644
--- a/include/linux/debugfs.h
+++ b/include/linux/debugfs.h
@@ -19,9 +19,11 @@
 #include <linux/seq_file.h>
 
 #include <linux/types.h>
+#include <linux/compiler.h>
 
 struct device;
 struct file_operations;
+struct srcu_struct;
 
 struct debugfs_blob_wrapper {
         void *data;
@@ -41,14 +43,16 @@ struct debugfs_regset32 {
 
 extern struct dentry *arch_debugfs_dir;
 
-#if defined(CONFIG_DEBUG_FS)
+extern struct srcu_struct debugfs_srcu;
 
-/* declared over in file.c */
-extern const struct file_operations debugfs_file_operations;
+#if defined(CONFIG_DEBUG_FS)
 
 struct dentry *debugfs_create_file(const char *name, umode_t mode,
                                    struct dentry *parent, void *data,
                                    const struct file_operations *fops);
+struct dentry *debugfs_create_file_unsafe(const char *name, umode_t mode,
+                                   struct dentry *parent, void *data,
+                                   const struct file_operations *fops);
 
 struct dentry *debugfs_create_file_size(const char *name, umode_t mode,
                                         struct dentry *parent, void *data,
@@ -68,6 +72,31 @@ struct dentry *debugfs_create_automount(const char *name,
 void debugfs_remove(struct dentry *dentry);
 void debugfs_remove_recursive(struct dentry *dentry);
 
+int debugfs_use_file_start(const struct dentry *dentry, int *srcu_idx)
+        __acquires(&debugfs_srcu);
+
+void debugfs_use_file_finish(int srcu_idx) __releases(&debugfs_srcu);
+
+ssize_t debugfs_attr_read(struct file *file, char __user *buf,
+                        size_t len, loff_t *ppos);
+ssize_t debugfs_attr_write(struct file *file, const char __user *buf,
+                        size_t len, loff_t *ppos);
+
+#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt)           \
+static int __fops ## _open(struct inode *inode, struct file *file)      \
+{                                                                       \
+        __simple_attr_check_format(__fmt, 0ull);                        \
+        return simple_attr_open(inode, file, __get, __set, __fmt);      \
+}                                                                       \
+static const struct file_operations __fops = {                          \
+        .owner   = THIS_MODULE,                                 \
+        .open    = __fops ## _open,                                     \
+        .release = simple_attr_release,                         \
+        .read    = debugfs_attr_read,                                   \
+        .write   = debugfs_attr_write,                                  \
+        .llseek  = generic_file_llseek,                         \
+}
+
 struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
                 struct dentry *new_dir, const char *new_name);
 
@@ -176,6 +205,20 @@ static inline void debugfs_remove(struct dentry *dentry)
 static inline void debugfs_remove_recursive(struct dentry *dentry)
 { }
 
+static inline int debugfs_use_file_start(const struct dentry *dentry,
+                                        int *srcu_idx)
+        __acquires(&debugfs_srcu)
+{
+        return 0;
+}
+
+static inline void debugfs_use_file_finish(int srcu_idx)
+        __releases(&debugfs_srcu)
+{ }
+
+#define DEFINE_DEBUGFS_ATTRIBUTE(__fops, __get, __set, __fmt)   \
+        static const struct file_operations __fops = { 0 }
+
 static inline struct dentry *debugfs_rename(struct dentry *old_dir, struct dentry *old_dentry,
                 struct dentry *new_dir, char *new_name)
 {