1 files changed, 5 insertions, 1 deletions
diff --git a/fs/dax.c b/fs/dax.c
index d778e5f1a01c..74838c43be91 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -568,7 +568,11 @@ int __dax_pmd_fault(struct vm_area_struct *vma, unsigned long address,
 	if ((pgoff | PG_PMD_COLOUR) >= size)
 		goto fallback;
 
-	if (is_huge_zero_pmd(*pmd))
+	/*
+	 * If we allocated new storage, make sure no process has any
+	 * zero pages covering this hole
+	 */
+	if (buffer_new(&bh))
 		unmap_mapping_range(mapping, pgoff << PAGE_SHIFT, PMD_SIZE, 0);
 
 	if (!write && !buffer_mapped(&bh) && buffer_uptodate(&bh)) {