From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 572BBC43381 for ; Fri, 22 Feb 2019 10:16:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F8ED20823 for ; Fri, 22 Feb 2019 10:16:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726604AbfBVKQ4 (ORCPT ); Fri, 22 Feb 2019 05:16:56 -0500 Received: from mx2.suse.de ([195.135.220.15]:44588 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726083AbfBVKQ4 (ORCPT ); Fri, 22 Feb 2019 05:16:56 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 83A96B15B; Fri, 22 Feb 2019 10:16:54 +0000 (UTC) From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: dan.carpenter@oracle.com Subject: [PATCH 1/5] btrfs: extent_io: Add comment about the return value of alloc_extent_buffer() Date: Fri, 22 Feb 2019 18:16:40 +0800 Message-Id: <20190222101645.4403-2-wqu@suse.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190222101645.4403-1-wqu@suse.com> References: <20190222101645.4403-1-wqu@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org To inform later developers how to check the return value of it. Signed-off-by: Qu Wenruo --- fs/btrfs/extent_io.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 52abe4082680..b28a75546700 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4890,6 +4890,13 @@ struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, } #endif +/* + * Allocate an extent buffer structure, with all its pages attached and locked. + * + * Return valid pointer if nothing goes wrong. + * Return PTR_ERR() if failed. + * Will never return NULL. + */ struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start) { -- 2.20.1