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 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2253BC43219 for ; Tue, 9 Nov 2021 01:51:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0AE7461105 for ; Tue, 9 Nov 2021 01:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240602AbhKIBxu (ORCPT ); Mon, 8 Nov 2021 20:53:50 -0500 Received: from mail110.syd.optusnet.com.au ([211.29.132.97]:39229 "EHLO mail110.syd.optusnet.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240512AbhKIBxq (ORCPT ); Mon, 8 Nov 2021 20:53:46 -0500 Received: from dread.disaster.area (pa49-195-103-97.pa.nsw.optusnet.com.au [49.195.103.97]) by mail110.syd.optusnet.com.au (Postfix) with ESMTPS id 19E5F106F34 for ; Tue, 9 Nov 2021 12:50:59 +1100 (AEDT) Received: from discord.disaster.area ([192.168.253.110]) by dread.disaster.area with esmtp (Exim 4.92.3) (envelope-from ) id 1mkGHq-006ZYM-Ep for linux-xfs@vger.kernel.org; Tue, 09 Nov 2021 12:50:58 +1100 Received: from dave by discord.disaster.area with local (Exim 4.95) (envelope-from ) id 1mkGHq-006Ud6-DH for linux-xfs@vger.kernel.org; Tue, 09 Nov 2021 12:50:58 +1100 From: Dave Chinner To: linux-xfs@vger.kernel.org Subject: [PATCH 11/16] xfs: introduce xlog_write_full() Date: Tue, 9 Nov 2021 12:50:50 +1100 Message-Id: <20211109015055.1547604-12-david@fromorbit.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211109015055.1547604-1-david@fromorbit.com> References: <20211109015055.1547604-1-david@fromorbit.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.4 cv=VuxAv86n c=1 sm=1 tr=0 ts=6189d403 a=fP9RlOTWD4uZJjPSFnn6Ew==:117 a=fP9RlOTWD4uZJjPSFnn6Ew==:17 a=vIxV3rELxO4A:10 a=20KFwNOVAAAA:8 a=hsp_SK2YdsCZxtrFqncA:9 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. This incorporates some factoring and simplifications proposed by Christoph Hellwig. Signed-off-by: Dave Chinner --- fs/xfs/xfs_log.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 68 insertions(+), 3 deletions(-) diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c index f26c85dbc765..44134f8e699c 100644 --- a/fs/xfs/xfs_log.c +++ b/fs/xfs/xfs_log.c @@ -2224,6 +2224,60 @@ xlog_print_trans( } } +static inline void +xlog_write_iovec( + struct xlog_in_core *iclog, + uint32_t *log_offset, + void *data, + uint32_t write_len, + int *bytes_left, + uint32_t *record_cnt, + uint32_t *data_cnt) +{ + ASSERT(*log_offset % sizeof(int32_t) == 0); + ASSERT(write_len % sizeof(int32_t) == 0); + + memcpy(iclog->ic_datap + *log_offset, data, write_len); + *log_offset += write_len; + *bytes_left -= write_len; + (*record_cnt)++; + *data_cnt += write_len; +} + +/* + * Write log vectors into a single iclog which is guaranteed by the caller + * to have enough space to write the entire log vector into. + */ +static void +xlog_write_full( + struct xfs_log_vec *lv, + struct xlog_ticket *ticket, + struct xlog_in_core *iclog, + uint32_t *log_offset, + uint32_t *len, + uint32_t *record_cnt, + uint32_t *data_cnt) +{ + int index; + + ASSERT(*log_offset + *len <= iclog->ic_size); + + /* + * 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; + + ophdr->oh_tid = cpu_to_be32(ticket->t_tid); + ophdr->oh_len = cpu_to_be32(reg->i_len - + sizeof(struct xlog_op_header)); + xlog_write_iovec(iclog, log_offset, reg->i_addr, + reg->i_len, len, record_cnt, data_cnt); + } +} + static xlog_op_header_t * xlog_write_setup_ophdr( struct xlog_op_header *ophdr, @@ -2388,8 +2442,8 @@ xlog_write( int partial_copy = 0; int partial_copy_len = 0; int contwr = 0; - int record_cnt = 0; - int data_cnt = 0; + uint32_t record_cnt = 0; + uint32_t data_cnt = 0; int error = 0; if (ticket->t_curr_res < 0) { @@ -2409,7 +2463,6 @@ xlog_write( return error; ASSERT(log_offset <= iclog->ic_size - 1); - ptr = iclog->ic_datap + log_offset; /* * If we have a context pointer, pass it the first iclog we are @@ -2421,10 +2474,22 @@ xlog_write( ctx = NULL; } + /* If this is a single iclog write, go fast... */ + if (!contwr && lv == log_vector) { + while (lv) { + xlog_write_full(lv, ticket, iclog, &log_offset, + &len, &record_cnt, &data_cnt); + lv = lv->lv_next; + } + data_cnt = 0; + 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; -- 2.33.0