From patchwork Wed May 10 18:02:03 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 9720443 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 2A72160365 for ; Wed, 10 May 2017 18:07:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4F0E326E78 for ; Wed, 10 May 2017 18:07:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 43BE828622; Wed, 10 May 2017 18:07:03 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C8D2626E78 for ; Wed, 10 May 2017 18:07:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754169AbdEJSCe (ORCPT ); Wed, 10 May 2017 14:02:34 -0400 Received: from bombadil.infradead.org ([65.50.211.133]:57412 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753839AbdEJSCc (ORCPT ); Wed, 10 May 2017 14:02:32 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=References:In-Reply-To:Message-Id: Date:Subject:Cc:To:From:Sender:Reply-To:MIME-Version:Content-Type: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=JMVU7kZIzRPPcjdW7H7P/tUcl2we2ESltb1rFR3U+so=; b=EZMxx4ummgC1hR8xNO/b2kiuA FkOazBFtpDAT9QYA4XlBfYDTvf+GOoelUo/I+nfICwNbJxy1b6PHalD2xt/1wAW85yrIiglcB/1Va AGINpGWI/xf+D4EpAKaXMLS42dvXNwz205CuWk+9PBF9KnoTt6cU0jLnpjtctPDe1OA5vlIsOsrJ2 TFbP2pbOikCCuBTi3QHVfrGWFJYOn6MvdFmapG5K0UihC9/rDoqdiV/IXR4hds1m/JSpi/JB+uNkO iB5MUG44mWCr9yAv691sxI2Z/xA2U/RpulFv/O2V7gHni7HieKJwHZCas2kVa37v7PL0nPDmx1/k4 Q4uInpZ2w==; Received: from clnet-p099-196.ikbnet.co.at ([83.175.99.196] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.87 #1 (Red Hat Linux)) id 1d8VwV-0005Hi-4V; Wed, 10 May 2017 18:02:31 +0000 From: Christoph Hellwig To: Andy Shevchenko , Amir Goldstein , linux-fsdevel@vger.kernel.org Cc: Shaohua Li , Dan Williams , David Howells , Steven Whitehouse , Mimi Zohar , linux-xfs@vger.kernel.org, linux-raid@vger.kernel.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org Subject: [PATCH 05/16] uuid: add the v1 layout to uuid_t Date: Wed, 10 May 2017 20:02:03 +0200 Message-Id: <20170510180214.16852-6-hch@lst.de> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20170510180214.16852-1-hch@lst.de> References: <20170510180214.16852-1-hch@lst.de> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Turn the content of uuid_t into a union and add the fields for the v1 interpretation to it. Signed-off-by: Christoph Hellwig Reviewed-by: David Howells --- include/uapi/linux/uuid.h | 29 ++++++++++++++++++++++++++++- 1 file changed, 28 insertions(+), 1 deletion(-) diff --git a/include/uapi/linux/uuid.h b/include/uapi/linux/uuid.h index 1a2914d8b225..1039d2f3e114 100644 --- a/include/uapi/linux/uuid.h +++ b/include/uapi/linux/uuid.h @@ -25,7 +25,34 @@ typedef struct { } guid_t; typedef struct { - __u8 b[16]; + union { + __u8 b[16]; + + /* + * V1 (time-based) UUID definition [RFC 4122]: + * - the timestamp is a 60-bit value, split 32/16/12, and goes + * in 100ns increments since midnight 15th October 1582 + * - add UUID_TO_UNIX_TIME to convert unix time in 100ns + * units to UUID time + * - the clock sequence is a 14-bit counter to avoid duplicate + * times + */ + struct { + __be32 time_low; + __be16 time_mid; + __be16 time_hi_and_version; +#define UUID_TO_UNIX_TIME 0x01b21dd213814000ULL +#define UUID_TIMEHI_MASK 0x0fff +#define UUID_VERSION_TIME 0x1000 /* time-based UUID */ +#define UUID_VERSION_NAME 0x3000 /* name-based UUID */ +#define UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */ + u8 clock_seq_hi_and_reserved; +#define UUID_CLOCKHI_MASK 0x3f +#define UUID_VARIANT_STD 0x80 + u8 clock_seq_low; + u8 node[6]; + } v1; + }; } uuid_t; #define GUID(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7) \