-int sandbox_fs_size(const char *filename);
-int fs_read_sandbox(const char *filename, void *buf, int offset, int len);
-int fs_write_sandbox(const char *filename, void *buf, int offset, int len);
+int sandbox_fs_size(const char *filename, loff_t *size);
+int fs_read_sandbox(const char *filename, void *buf, loff_t offset, loff_t len,
+ loff_t *actread);
+int fs_write_sandbox(const char *filename, void *buf, loff_t offset,
+ loff_t len, loff_t *actwrite);