+/* read the beginning of an unaligned first page */
+static int _add_to_r4w_first_page(struct ore_io_state *ios, struct page *page)
+{
+ struct ore_striping_info si;
+ unsigned pg_len;
+
+ ore_calc_stripe_info(ios->layout, ios->offset, 0, &si);
+
+ pg_len = si.obj_offset % PAGE_SIZE;
+ si.obj_offset -= pg_len;
+
+ ORE_DBGMSG("offset=0x%llx len=0x%x index=0x%lx dev=%x\n",
+ _LLU(si.obj_offset), pg_len, page->index, si.dev);
+
+ return _add_to_r4w(ios, &si, page, pg_len);
+}
+
+/* read the end of an incomplete last page */
+static int _add_to_r4w_last_page(struct ore_io_state *ios, u64 *offset)
+{
+ struct ore_striping_info si;
+ struct page *page;
+ unsigned pg_len, p, c;
+
+ ore_calc_stripe_info(ios->layout, *offset, 0, &si);
+
+ p = si.unit_off / PAGE_SIZE;
+ c = _dev_order(ios->layout->group_width * ios->layout->mirrors_p1,
+ ios->layout->mirrors_p1, si.par_dev, si.dev);
+ page = ios->sp2d->_1p_stripes[p].pages[c];
+
+ pg_len = PAGE_SIZE - (si.unit_off % PAGE_SIZE);
+ *offset += pg_len;
+
+ ORE_DBGMSG("p=%d, c=%d next-offset=0x%llx len=0x%x dev=%x par_dev=%d\n",
+ p, c, _LLU(*offset), pg_len, si.dev, si.par_dev);
+
+ BUG_ON(!page);
+
+ return _add_to_r4w(ios, &si, page, pg_len);
+}
+