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Diffstat (limited to 'mm/vmscan.c')
-rw-r--r--mm/vmscan.c20
1 files changed, 19 insertions, 1 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5e98b86feb74..5a610804cd06 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -615,6 +615,15 @@ int putback_lru_pages(struct list_head *l)
}
/*
+ * Non migratable page
+ */
+int fail_migrate_page(struct page *newpage, struct page *page)
+{
+ return -EIO;
+}
+EXPORT_SYMBOL(fail_migrate_page);
+
+/*
* swapout a single page
* page is locked upon entry, unlocked on exit
*/
@@ -659,6 +668,7 @@ unlock_retry:
retry:
return -EAGAIN;
}
+EXPORT_SYMBOL(swap_page);
/*
* Page migration was first developed in the context of the memory hotplug
@@ -674,7 +684,7 @@ retry:
* Remove references for a page and establish the new page with the correct
* basic settings to be able to stop accesses to the page.
*/
-static int migrate_page_remove_references(struct page *newpage,
+int migrate_page_remove_references(struct page *newpage,
struct page *page, int nr_refs)
{
struct address_space *mapping = page_mapping(page);
@@ -749,6 +759,7 @@ static int migrate_page_remove_references(struct page *newpage,
return 0;
}
+EXPORT_SYMBOL(migrate_page_remove_references);
/*
* Copy the page to its new location
@@ -788,6 +799,7 @@ void migrate_page_copy(struct page *newpage, struct page *page)
if (PageWriteback(newpage))
end_page_writeback(newpage);
}
+EXPORT_SYMBOL(migrate_page_copy);
/*
* Common logic to directly migrate a single page suitable for
@@ -815,6 +827,7 @@ int migrate_page(struct page *newpage, struct page *page)
remove_from_swap(newpage);
return 0;
}
+EXPORT_SYMBOL(migrate_page);
/*
* migrate_pages
@@ -914,6 +927,11 @@ redo:
if (!mapping)
goto unlock_both;
+ if (mapping->a_ops->migratepage) {
+ rc = mapping->a_ops->migratepage(newpage, page);
+ goto unlock_both;
+ }
+
/*
* Trigger writeout if page is dirty
*/