diff --git a/fs/buffer.c b/fs/buffer.c
index 2e0a9e1..4d06a57 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2077,6 +2077,7 @@
 			struct page *page, void *fsdata)
 {
 	struct inode *inode = mapping->host;
+	loff_t old_size = inode->i_size;
 	int i_size_changed = 0;
 
 	copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
@@ -2096,6 +2097,8 @@
 	unlock_page(page);
 	page_cache_release(page);
 
+	if (old_size < pos)
+		pagecache_isize_extended(inode, old_size, pos);
 	/*
 	 * Don't mark the inode dirty under page lock. First, it unnecessarily
 	 * makes the holding time of page lock longer. Second, it forces lock