diff --git a/fs/ecryptfs/read_write.c b/fs/ecryptfs/read_write.c
index ccd2599..272eaeb 100644
--- a/fs/ecryptfs/read_write.c
+++ b/fs/ecryptfs/read_write.c
@@ -87,7 +87,8 @@
 	loff_t offset;
 	int rc;
 
-	offset = (page_for_lower->index << PAGE_CACHE_SHIFT) + offset_in_page;
+	offset = ((((off_t)page_for_lower->index) << PAGE_CACHE_SHIFT)
+		  + offset_in_page);
 	virt = kmap(page_for_lower);
 	rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
 	kunmap(page_for_lower);
@@ -117,7 +118,8 @@
 {
 	struct page *ecryptfs_page;
 	char *ecryptfs_page_virt;
-	u64 ecryptfs_file_size = i_size_read(ecryptfs_file->f_dentry->d_inode);
+	loff_t ecryptfs_file_size =
+		i_size_read(ecryptfs_file->f_dentry->d_inode);
 	loff_t data_offset = 0;
 	loff_t pos;
 	int rc = 0;
@@ -277,7 +279,7 @@
 	loff_t offset;
 	int rc;
 
-	offset = ((page_index << PAGE_CACHE_SHIFT) + offset_in_page);
+	offset = ((((loff_t)page_index) << PAGE_CACHE_SHIFT) + offset_in_page);
 	virt = kmap(page_for_ecryptfs);
 	rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
 	kunmap(page_for_ecryptfs);
@@ -306,7 +308,8 @@
 {
 	struct page *ecryptfs_page;
 	char *ecryptfs_page_virt;
-	u64 ecryptfs_file_size = i_size_read(ecryptfs_file->f_dentry->d_inode);
+	loff_t ecryptfs_file_size =
+		i_size_read(ecryptfs_file->f_dentry->d_inode);
 	loff_t data_offset = 0;
 	loff_t pos;
 	int rc = 0;