--- zzzz-none-000/linux-4.4.271/include/linux/pstore.h	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/include/linux/pstore.h	2023-04-19 10:22:30.000000000 +0000
@@ -70,6 +70,8 @@
 	int		(*erase)(enum pstore_type_id type, u64 id,
 			int count, struct timespec time,
 			struct pstore_info *psi);
+	ssize_t		(*copy)(enum pstore_type_id type, u64 id, void **buf,
+			struct pstore_info *psi);
 	void		*data;
 };
 
@@ -79,4 +81,6 @@
 extern void pstore_unregister(struct pstore_info *);
 extern bool pstore_cannot_block_path(enum kmsg_dump_reason reason);
 
+#define pstore_copy pstore_copy
+extern ssize_t pstore_copy(enum pstore_type_id type, u64 id, void **buf);
 #endif /*_LINUX_PSTORE_H*/