kcore: fix vread/vwrite to be aware of holes

[safe/jmp/linux-2.6] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index dd51c68..bcc7372 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -119,6 +119,8 @@ void __remove_from_page_cache(struct page *page)
        page->mapping = NULL;
        mapping->nrpages--;
        __dec_zone_page_state(page, NR_FILE_PAGES);
+       if (PageSwapBacked(page))
+               __dec_zone_page_state(page, NR_SHMEM);
        BUG_ON(page_mapped(page));
 
        /*
@@ -431,6 +433,8 @@ int add_to_page_cache_locked(struct page *page, struct address_space *mapping,
                if (likely(!error)) {
                        mapping->nrpages++;
                        __inc_zone_page_state(page, NR_FILE_PAGES);
+                       if (PageSwapBacked(page))
+                               __inc_zone_page_state(page, NR_SHMEM);
                        spin_unlock_irq(&mapping->tree_lock);
                } else {
                        page->mapping = NULL;