ext4 crypto: inherit encryption policies on inode and directory create

Signed-off-by: Michael Halcrow <mhalcrow@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

fs/ext4/namei.c

@@ -2253,7 +2253,19 @@ static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 		else
 			inode->i_fop = &ext4_file_operations;
 		ext4_set_aops(inode);
-		err = ext4_add_nondir(handle, dentry, inode);
+		err = 0;
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+		if (!err && ext4_encrypted_inode(dir)) {
+			err = ext4_inherit_context(dir, inode);
+			if (err) {
+				clear_nlink(inode);
+				unlock_new_inode(inode);
+				iput(inode);
+			}
+		}
+#endif
+		if (!err)
+			err = ext4_add_nondir(handle, dentry, inode);
 		if (!err && IS_DIRSYNC(dir))
 			ext4_handle_sync(handle);
 	}
@@ -2437,6 +2449,13 @@ static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 	err = ext4_init_new_dir(handle, dir, inode);
 	if (err)
 		goto out_clear_inode;
+#ifdef CONFIG_EXT4_FS_ENCRYPTION
+	if (ext4_encrypted_inode(dir)) {
+		err = ext4_inherit_context(dir, inode);
+		if (err)
+			goto out_clear_inode;
+	}
+#endif
 	err = ext4_mark_inode_dirty(handle, inode);
 	if (!err)
 		err = ext4_add_entry(handle, dentry, inode);