1 files changed, 5 insertions, 0 deletions
diff --git a/include/erofs/io.h b/include/erofs/io.h
index 0763baf..2597bf4 100644
--- a/include/erofs/io.h
+++ b/include/erofs/io.h
@@ -7,6 +7,7 @@
 #ifndef __EROFS_IO_H
 #define __EROFS_IO_H
 
+#define _GNU_SOURCE
 #include <unistd.h>
 #include "internal.h"
 
@@ -24,6 +25,10 @@ int dev_fsync(void);
 int dev_resize(erofs_blk_t nblocks);
 u64 dev_length(void);
 
+int erofs_copy_file_range(int fd_in, erofs_off_t *off_in,
+                          int fd_out, erofs_off_t *off_out,
+                          size_t length);
+
 static inline int blk_write(const void *buf, erofs_blk_t blkaddr,
 			    u32 nblocks)
 {