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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,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 23959C47082 for ; Thu, 3 Jun 2021 05:23:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0E40661359 for ; Thu, 3 Jun 2021 05:23:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229758AbhFCFZH (ORCPT ); Thu, 3 Jun 2021 01:25:07 -0400 Received: from mail110.syd.optusnet.com.au ([211.29.132.97]:56966 "EHLO mail110.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbhFCFZH (ORCPT ); Thu, 3 Jun 2021 01:25:07 -0400 Received: from dread.disaster.area (pa49-179-138-183.pa.nsw.optusnet.com.au [49.179.138.183]) by mail110.syd.optusnet.com.au (Postfix) with ESMTPS id 832BD1054DA for ; Thu, 3 Jun 2021 15:22:51 +1000 (AEST) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.3) (envelope-from ) id 1lofoh-008Mqu-0n for linux-xfs@vger.kernel.org; Thu, 03 Jun 2021 15:22:51 +1000 Received: from dave by discord.disaster.area with local (Exim 4.94) (envelope-from ) id 1lofog-000imC-Pf for linux-xfs@vger.kernel.org; Thu, 03 Jun 2021 15:22:50 +1000 From: Dave Chinner To: linux-xfs@vger.kernel.org Subject: [PATCH 21/39] xfs: introduce xlog_write_single() Date: Thu, 3 Jun 2021 15:22:22 +1000 Message-Id: <20210603052240.171998-22-david@fromorbit.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210603052240.171998-1-david@fromorbit.com> References: <20210603052240.171998-1-david@fromorbit.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.3 cv=F8MpiZpN c=1 sm=1 tr=0 a=MnllW2CieawZLw/OcHE/Ng==:117 a=MnllW2CieawZLw/OcHE/Ng==:17 a=r6YtysWOX24A:10 a=20KFwNOVAAAA:8 a=VwQbUJbxAAAA:8 a=S83ClQuvNvUpNviAnokA:9 a=AjGcO6oz07-iQ99wixmX:22 Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org From: Dave Chinner Introduce an optimised version of xlog_write() that is used when the entire write will fit in a single iclog. This greatly simplifies the implementation of writing a log vector chain into an iclog, and sets the ground work for a much more understandable xlog_write() implementation. Signed-off-by: Dave Chinner Reviewed-by: Darrick J. Wong --- fs/xfs/xfs_log.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 56 insertions(+), 1 deletion(-) diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index 58f9aafce29e..3b74d21e3786 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2225,6 +2225,52 @@ xlog_write_copy_finish( return error; } +/* + * Write log vectors into a single iclog which is guaranteed by the caller + * to have enough space to write the entire log vector into. Return the number + * of log vectors written into the iclog. + */ +static int +xlog_write_single( + struct xfs_log_vec *log_vector, + struct xlog_ticket *ticket, + struct xlog_in_core *iclog, + uint32_t log_offset, + uint32_t len) +{ + struct xfs_log_vec *lv; + void *ptr; + int index = 0; + int record_cnt = 0; + + ASSERT(log_offset + len <= iclog->ic_size); + + ptr = iclog->ic_datap + log_offset; + for (lv = log_vector; lv; lv = lv->lv_next) { + /* + * Ordered log vectors have no regions to write so this + * loop will naturally skip them. + */ + for (index = 0; index < lv->lv_niovecs; index++) { + struct xfs_log_iovec *reg = &lv->lv_iovecp[index]; + struct xlog_op_header *ophdr = reg->i_addr; + + ASSERT(reg->i_len % sizeof(int32_t) == 0); + ASSERT((unsigned long)ptr % sizeof(int32_t) == 0); + + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); + ophdr->oh_len = cpu_to_be32(reg->i_len - + sizeof(struct xlog_op_header)); + memcpy(ptr, reg->i_addr, reg->i_len); + xlog_write_adv_cnt(&ptr, &len, &log_offset, reg->i_len); + record_cnt++; + } + } + ASSERT(len == 0); + return record_cnt; +} + + /* * Write some region out to in-core log * @@ -2305,16 +2351,25 @@ xlog_write( return error; ASSERT(log_offset <= iclog->ic_size - 1); - ptr = iclog->ic_datap + log_offset; /* Start_lsn is the first lsn written to. */ if (start_lsn && !*start_lsn) *start_lsn = be64_to_cpu(iclog->ic_header.h_lsn); + /* If this is a single iclog write, go fast... */ + if (!contwr && lv == log_vector) { + record_cnt = xlog_write_single(lv, ticket, iclog, + log_offset, len); + len = 0; + data_cnt = len; + break; + } + /* * This loop writes out as many regions as can fit in the amount * of space which was allocated by xlog_state_get_iclog_space(). */ + ptr = iclog->ic_datap + log_offset; while (lv && (!lv->lv_niovecs || index < lv->lv_niovecs)) { struct xfs_log_iovec *reg; struct xlog_op_header *ophdr; -- 2.31.1