1 files changed, 27 insertions, 5 deletions

diff --git a/mm/memory.c b/mm/memory.c
index d8dde07a3656..7197f9bcd384 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1498,7 +1498,7 @@ gotten:
                 update_mmu_cache(vma, address, entry);
                 lazy_mmu_prot_update(entry);
                 lru_cache_add_active(new_page);
-                page_add_anon_rmap(new_page, vma, address);
+                page_add_new_anon_rmap(new_page, vma, address);
 
                 /* Free the old page.. */
                 new_page = old_page;
@@ -1770,9 +1770,32 @@ out_big:
 out_busy:
         return -ETXTBSY;
 }
-
 EXPORT_SYMBOL(vmtruncate);
 
+int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
+{
+        struct address_space *mapping = inode->i_mapping;
+
+        /*
+         * If the underlying filesystem is not going to provide
+         * a way to truncate a range of blocks (punch a hole) -
+         * we should return failure right now.
+         */
+        if (!inode->i_op || !inode->i_op->truncate_range)
+                return -ENOSYS;
+
+        down(&inode->i_sem);
+        down_write(&inode->i_alloc_sem);
+        unmap_mapping_range(mapping, offset, (end - offset), 1);
+        truncate_inode_pages_range(mapping, offset, end);
+        inode->i_op->truncate_range(inode, offset, end);
+        up_write(&inode->i_alloc_sem);
+        up(&inode->i_sem);
+
+        return 0;
+}
+EXPORT_SYMBOL(vmtruncate_range);
+
 /* 
  * Primitive swap readahead code. We simply read an aligned block of
  * (1 << page_cluster) entries in the swap area. This method is chosen
@@ -1954,8 +1977,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                         goto release;
                 inc_mm_counter(mm, anon_rss);
                 lru_cache_add_active(page);
-                SetPageReferenced(page);
-                page_add_anon_rmap(page, vma, address);
+                page_add_new_anon_rmap(page, vma, address);
         } else {
                 /* Map the ZERO_PAGE - vm_page_prot is readonly */
                 page = ZERO_PAGE(address);
@@ -2086,7 +2108,7 @@ retry:
                 if (anon) {
                         inc_mm_counter(mm, anon_rss);
                         lru_cache_add_active(new_page);
-                        page_add_anon_rmap(new_page, vma, address);
+                        page_add_new_anon_rmap(new_page, vma, address);
                 } else {
                         inc_mm_counter(mm, file_rss);
                         page_add_file_rmap(new_page);