From patchwork Tue Apr 28 22:05:42 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Christie X-Patchwork-Id: 6292411 Return-Path: X-Original-To: patchwork-ceph-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 443CA9F46B for ; Tue, 28 Apr 2015 22:06:18 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 76952202C8 for ; Tue, 28 Apr 2015 22:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 85D842024C for ; Tue, 28 Apr 2015 22:06:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030715AbbD1WGA (ORCPT ); Tue, 28 Apr 2015 18:06:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:43119 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030986AbbD1WFw (ORCPT ); Tue, 28 Apr 2015 18:05:52 -0400 Received: from int-mx14.intmail.prod.int.phx2.redhat.com (int-mx14.intmail.prod.int.phx2.redhat.com [10.5.11.27]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id t3SM5qnq023753 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Tue, 28 Apr 2015 18:05:52 -0400 Received: from rh2.redhat.com (vpn-49-183.rdu2.redhat.com [10.10.49.183]) by int-mx14.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id t3SM5mbQ013102 for ; Tue, 28 Apr 2015 18:05:52 -0400 From: mchristi@redhat.com To: ceph-devel@vger.kernel.org Subject: [PATCH 05/10] ceph: decode start helper Date: Tue, 28 Apr 2015 17:05:42 -0500 Message-Id: <1430258747-12506-6-git-send-email-mchristi@redhat.com> In-Reply-To: <1430258747-12506-1-git-send-email-mchristi@redhat.com> References: <1430258747-12506-1-git-send-email-mchristi@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.27 Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Mike Christie Add support for userspace ceph DECODE_START. Signed-off-by: Mike Christie --- include/linux/ceph/decode.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/linux/ceph/decode.h b/include/linux/ceph/decode.h index 96ec43d..4f551b8 100644 --- a/include/linux/ceph/decode.h +++ b/include/linux/ceph/decode.h @@ -271,6 +271,29 @@ fail: return -ERANGE; } +/** + * ceph_start_decoding - start a decoding block + * @p: buffer to decode + * @end: end of buffer + * @curr_ver: current version of the encoding that the code supports/encode + * @len: buffer to return len of data in buffer + */ +static inline int ceph_start_decoding(void **p, void *end, u8 curr_ver, + u32 *len) +{ + u8 struct_ver, struct_compat; + + ceph_decode_8_safe(p, end, struct_ver, fail); + ceph_decode_8_safe(p, end, struct_compat, fail); + + if (curr_ver < struct_compat) + return -EINVAL; + + ceph_decode_32_safe(p, end, *len, fail); + return 0; +fail: + return -ERANGE; +} #define ceph_encode_need(p, end, n, bad) \ do { \