-long sandbox_fs_read_at(const char *filename, unsigned long pos,
- void *buffer, unsigned long maxsize);
+int sandbox_fs_set_blk_dev(struct blk_desc *rbdd, struct disk_partition *info);
+
+int sandbox_fs_read_at(const char *filename, loff_t pos, void *buffer,
+ loff_t maxsize, loff_t *actread);
+int sandbox_fs_write_at(const char *filename, loff_t pos, void *buffer,
+ loff_t maxsize, loff_t *actwrite);