--- zzzz-none-000/linux-5.4.213/include/linux/pstore.h	2022-09-15 10:04:56.000000000 +0000
+++ miami-7690-761/linux-5.4.213/include/linux/pstore.h	2024-05-29 11:20:02.000000000 +0000
@@ -96,6 +96,7 @@
  *
  * @read_mutex:	serializes @open, @read, @close, and @erase callbacks
  * @flags:	bitfield of frontends the backend can accept writes for
+ * @num_pmsg: amount of pmsg instances
  * @data:	backend-private pointer passed back during callbacks
  *
  * Callbacks:
@@ -179,6 +180,7 @@
 	struct mutex	read_mutex;
 
 	int		flags;
+	unsigned int	num_pmsg;
 	void		*data;
 
 	int		(*open)(struct pstore_info *psi);
@@ -187,6 +189,8 @@
 	int		(*write)(struct pstore_record *record);
 	int		(*write_user)(struct pstore_record *record,
 				      const char __user *buf);
+	ssize_t		(*copy)(enum pstore_type_id type, u64 id, void **buf,
+			struct pstore_info *psi);
 	int		(*erase)(struct pstore_record *record);
 };
 
@@ -275,4 +279,6 @@
 }
 #endif
 
+#define pstore_copy pstore_copy
+extern ssize_t pstore_copy(enum pstore_type_id type, u64 id, void **buf);
 #endif /*_LINUX_PSTORE_H*/