diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 24cb9ec..26e9018 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -1350,8 +1350,12 @@
 	}
 
 out:
-	if (!(mode & FALLOC_FL_KEEP_SIZE) && i_size_read(inode) < new_size)
-		f2fs_i_size_write(inode, new_size);
+	if (new_size > i_size_read(inode)) {
+		if (mode & FALLOC_FL_KEEP_SIZE)
+			file_set_keep_isize(inode);
+		else
+			f2fs_i_size_write(inode, new_size);
+	}
 out_sem:
 	up_write(&F2FS_I(inode)->i_mmap_sem);