Index: vm/swap_pager.c
===================================================================
--- vm/swap_pager.c	(revision 326507)
+++ vm/swap_pager.c	(working copy)
@@ -1634,33 +1634,24 @@
  *	We also attempt to swap in all other pages in the swap block.
  *	However, we only guarantee that the one at the specified index is
  *	paged in.
- *
- *	XXX - The code to page the whole block in doesn't work, so we
- *	      revert to the one-by-one behavior for now.  Sigh.
  */
-static inline void
-swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
+static void
+swp_pager_activate_vmpage(vm_object_t object, vm_page_t m)
 {
-	vm_page_t m;
-
-	vm_object_pip_add(object, 1);
-	m = vm_page_grab(object, pindex, VM_ALLOC_NORMAL);
-	if (m->valid == VM_PAGE_BITS_ALL) {
-		vm_object_pip_wakeup(object);
-		vm_page_dirty(m);
+	vm_object_pip_wakeup(object);
+	vm_page_dirty(m);
 #ifdef INVARIANTS
-		vm_page_lock(m);
-		if (m->wire_count == 0 && m->queue == PQ_NONE)
-			panic("page %p is neither wired nor queued", m);
-		vm_page_unlock(m);
+	vm_page_lock(m);
+	if (m->wire_count == 0 && m->queue == PQ_NONE)
+		panic("page %p is neither wired nor queued", m);
+	vm_page_unlock(m);
 #endif
-		vm_page_xunbusy(m);
-		vm_pager_page_unswapped(m);
-		return;
-	}
-
-	if (swap_pager_getpages(object, &m, 1, NULL, NULL) != VM_PAGER_OK)
-		panic("swap_pager_force_pagein: read from swap failed");/*XXX*/
+	vm_page_xunbusy(m);
+	vm_pager_page_unswapped(m);
+}
+static void
+swp_pager_launder_vmpage(vm_object_t object, vm_page_t m)
+{
 	vm_object_pip_wakeup(object);
 	vm_page_dirty(m);
 	vm_page_lock(m);
@@ -1669,7 +1660,39 @@
 	vm_page_xunbusy(m);
 	vm_pager_page_unswapped(m);
 }
+static int
+swp_pager_force_pagein(vm_object_t object, vm_pindex_t pindex)
+{
+	vm_page_t m[SWB_NPAGES];
+	int count, i, j, npages, rv;
 
+	rv = swap_pager_haspage(object, pindex, NULL, &npages);
+	KASSERT(rv == 1, ("%s: missing page %p", __func__, m));
+	npages += 1;
+	i = vm_page_grab_pages(object, pindex, VM_ALLOC_NORMAL, m, npages);
+	vm_object_pip_add(object, npages);
+
+	for (i = 0; i < npages;) {
+		if (m[i]->valid == VM_PAGE_BITS_ALL) {
+			swp_pager_activate_vmpage(object, m[i]);
+			i++;
+			continue;
+		}
+
+		for (j = i + 1; j < npages; j++)
+			if (m[j]->valid == VM_PAGE_BITS_ALL)
+				break;
+
+		count = j - i;
+		if (swap_pager_getpages(object, &m[i], count, NULL, NULL) != VM_PAGER_OK)
+			panic("swap_pager_force_pagein: read from swap failed");/*XXX*/
+		for (; i < j; i++) {
+			swp_pager_launder_vmpage(object, m[i]);
+		}
+	}
+	return npages;
+}
+
 /*
  *	swap_pager_swapoff:
  *
@@ -1686,7 +1711,7 @@
 	struct swblk *sb;
 	vm_object_t object;
 	vm_pindex_t pi;
-	int i, retries;
+	int freedpages, i, offset, retries;
 
 	sx_assert(&swdev_syscall_lock, SA_XLOCKED);
 
@@ -1716,15 +1741,28 @@
 		if (object->type != OBJT_SWAP)
 			goto next_obj;
 
+		freedpages = offset = 0;
 		for (pi = 0; (sb = SWAP_PCTRIE_LOOKUP_GE(
 		    &object->un_pager.swp.swp_blks, pi)) != NULL; ) {
 			pi = sb->p + SWAP_META_PAGES;
-			for (i = 0; i < SWAP_META_PAGES; i++) {
+			if (freedpages > SWAP_META_PAGES) {
+				freedpages -= SWAP_META_PAGES;
+				continue;
+			} else if (offset > 0) {
+				i = freedpages;
+				freedpages = 0;
+			} else
+				i = 0;
+			for (; i < SWAP_META_PAGES; i++) {
 				if (sb->d[i] == SWAPBLK_NONE)
 					continue;
-				if (swp_pager_isondev(sb->d[i], sp))
-					swp_pager_force_pagein(object,
+				if (swp_pager_isondev(sb->d[i], sp)) {
+					freedpages = swp_pager_force_pagein(object,
 					    sb->p + i);
+					offset = min(freedpages, SWAP_META_PAGES - i);
+					freedpages -= offset;
+					i += ( offset - 1 );
+				}
 			}
 		}
 next_obj: