squashfs_copy_data
bytes = squashfs_copy_data(buffer, entry, *offset, length);
copied = squashfs_copy_data(pageaddr, buffer, offset, avail);
bytes = squashfs_copy_data(addr, buffer, offset +
extern int squashfs_copy_data(void *, struct squashfs_cache_entry *, int, int);
copied = squashfs_copy_data(pageaddr + bytes, entry, offset,