CIFS: cifs_writepages should not write beyond end of file

	pgoff_t index;

	int is_range = 0;

	struct kvec iov[32];

	int len;

	int n_iov = 0;

	pgoff_t next;

	int nr_pages;

				unlock_page(page);

				break;

			}

			if (page_offset(page) >= mapping->host->i_size) {

				done = 1;

				unlock_page(page);

				break;

			}

			/*

			 * BB can we get rid of this?  pages are held by pvec

			 */

			page_cache_get(page);

			len = min(mapping->host->i_size - page_offset(page),

				  (loff_t)PAGE_CACHE_SIZE);

			/* reserve iov[0] for the smb header */

			n_iov++;

			iov[n_iov].iov_base = kmap(page);

			iov[n_iov].iov_len = PAGE_CACHE_SIZE;

			bytes_to_write += PAGE_CACHE_SIZE;

			iov[n_iov].iov_len = len;

			bytes_to_write += len;

			if (first < 0) {

				first = i;