diff --git a/include/fat.h b/include/fat.h
index 20ca3f3..99c6429 100644
--- a/include/fat.h
+++ b/include/fat.h
@@ -178,8 +178,8 @@
 
 typedef int	(file_detectfs_func)(void);
 typedef int	(file_ls_func)(const char *dir);
-typedef long	(file_read_func)(const char *filename, void *buffer,
-				 unsigned long maxsize);
+typedef int	(file_read_func)(const char *filename, void *buffer,
+				 int maxsize);
 
 struct filesystem {
 	file_detectfs_func	*detect;
@@ -199,14 +199,15 @@
 int file_fat_ls(const char *dir);
 int fat_exists(const char *filename);
 int fat_size(const char *filename);
-long file_fat_read_at(const char *filename, unsigned long pos, void *buffer,
-		      unsigned long maxsize);
-long file_fat_read(const char *filename, void *buffer, unsigned long maxsize);
+int file_fat_read_at(const char *filename, loff_t pos, void *buffer,
+		     loff_t maxsize, loff_t *actread);
+int file_fat_read(const char *filename, void *buffer, int maxsize);
 const char *file_getfsname(int idx);
 int fat_set_blk_dev(block_dev_desc_t *rbdd, disk_partition_t *info);
 int fat_register_device(block_dev_desc_t *dev_desc, int part_no);
 
-int file_fat_write(const char *filename, void *buffer, unsigned long maxsize);
+int file_fat_write(const char *filename, void *buf, loff_t offset, loff_t len,
+		   loff_t *actwrite);
 int fat_read_file(const char *filename, void *buf, int offset, int len);
 void fat_close(void);
 #endif /* _FAT_H_ */