+#ifdef CONFIG_NUMA
+static struct page *shmem_swapin_async(struct shared_policy *p,
+ swp_entry_t entry, unsigned long idx)
+{
+ struct page *page;
+ struct vm_area_struct pvma;
+
+ /* Create a pseudo vma that just contains the policy */
+ memset(&pvma, 0, sizeof(struct vm_area_struct));
+ pvma.vm_end = PAGE_SIZE;
+ pvma.vm_pgoff = idx;
+ pvma.vm_policy = mpol_shared_policy_lookup(p, idx);
+ page = read_swap_cache_async(entry, &pvma, 0);
+ mpol_free(pvma.vm_policy);
+ return page;
+}
+
+struct page *shmem_swapin(struct shmem_inode_info *info, swp_entry_t entry,
+ unsigned long idx)
+{
+ struct shared_policy *p = &info->policy;
+ int i, num;
+ struct page *page;
+ unsigned long offset;
+
+ num = valid_swaphandles(entry, &offset);
+ for (i = 0; i < num; offset++, i++) {
+ page = shmem_swapin_async(p,
+ swp_entry(swp_type(entry), offset), idx);
+ if (!page)
+ break;
+ page_cache_release(page);
+ }
+ lru_add_drain(); /* Push any new pages onto the LRU now */
+ return shmem_swapin_async(p, entry, idx);
+}
+
+static struct page *
+shmem_alloc_page(unsigned long gfp, struct shmem_inode_info *info,
+ unsigned long idx)
+{
+ struct vm_area_struct pvma;
+ struct page *page;
+
+ memset(&pvma, 0, sizeof(struct vm_area_struct));
+ pvma.vm_policy = mpol_shared_policy_lookup(&info->policy, idx);
+ pvma.vm_pgoff = idx;
+ pvma.vm_end = PAGE_SIZE;
+ page = alloc_page_vma(gfp | __GFP_ZERO, &pvma, 0);
+ mpol_free(pvma.vm_policy);
+ return page;
+}
+#else
+static inline struct page *
+shmem_swapin(struct shmem_inode_info *info,swp_entry_t entry,unsigned long idx)
+{
+ swapin_readahead(entry, 0, NULL);
+ return read_swap_cache_async(entry, NULL, 0);
+}
+
+static inline struct page *
+shmem_alloc_page(unsigned long gfp,struct shmem_inode_info *info,
+ unsigned long idx)
+{
+ return alloc_page(gfp | __GFP_ZERO);
+}
+#endif
+