From patchwork Tue Jul 27 05:56:41 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 486806 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=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 13B69C4320E for ; Tue, 27 Jul 2021 06:16:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EE4D9610A0 for ; Tue, 27 Jul 2021 06:16:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235609AbhG0GQf (ORCPT ); Tue, 27 Jul 2021 02:16:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48344 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235508AbhG0GQd (ORCPT ); Tue, 27 Jul 2021 02:16:33 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78682C061757; Mon, 26 Jul 2021 23:16:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=F8YSvZx2lzuf6bXkI+L9ZUk8MKmM0LIxZKRYuYEBKDQ=; b=jVxQg207NT9/HxqG9tgVEP7G4w 7pC1RdHN5aFBqRsZcF3qwjF8E9Usa8zDHEZfz45QC7LPnTVyG33UWMeh15AF5po+8Cjz/2fRVzXLY HnE7eTZwDRu86s540KYvdZqd15H5WxOUm2hlMoHzIexUFqR0zSBpPorn5fus4uvWt9gfy42q7/DEk llUCA0zfayDcOCW/MzyFuPAs8n97oXJUr1HBvTy9tlN7a6v/ovRPnPZQAHOtkgSeMKch7Qct7/zy3 I30QP0iX125ZtnOTIZgGALBYrQiONXgP9sMlToSfHGDva+z7gkTzDUz7Xf8tLQ5CxoDyrdqhlFiyv RafRU3CA==; Received: from [2001:4bb8:184:87c5:b7fb:1299:a9e5:ff56] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1m8GJ5-00EjBT-Sc; Tue, 27 Jul 2021 06:11:48 +0000 From: Christoph Hellwig To: Jens Axboe , Thomas Gleixner Cc: Thomas Bogendoerfer , Andrew Morton , Geoff Levand , Ilya Dryomov , Dongsheng Yang , Mike Snitzer , "James E.J. Bottomley" , Ira Weiny , dm-devel@redhat.com, linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, ceph-devel@vger.kernel.org, linux-arch@vger.kernel.org, "Martin K . Petersen" Subject: [PATCH 10/15] block: rewrite bio_copy_data_iter to use bvec_kmap_local and memcpy_to_bvec Date: Tue, 27 Jul 2021 07:56:41 +0200 Message-Id: <20210727055646.118787-11-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727055646.118787-1-hch@lst.de> References: <20210727055646.118787-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Use the proper helpers instead of open coding the copy. Signed-off-by: Christoph Hellwig Reviewed-by: Martin K. Petersen --- block/bio.c | 28 ++++++++-------------------- 1 file changed, 8 insertions(+), 20 deletions(-) diff --git a/block/bio.c b/block/bio.c index 2e436bccb1e2..0c89fa2f7a85 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1186,27 +1186,15 @@ EXPORT_SYMBOL(bio_advance); void bio_copy_data_iter(struct bio *dst, struct bvec_iter *dst_iter, struct bio *src, struct bvec_iter *src_iter) { - struct bio_vec src_bv, dst_bv; - void *src_p, *dst_p; - unsigned bytes; - while (src_iter->bi_size && dst_iter->bi_size) { - src_bv = bio_iter_iovec(src, *src_iter); - dst_bv = bio_iter_iovec(dst, *dst_iter); - - bytes = min(src_bv.bv_len, dst_bv.bv_len); - - src_p = kmap_atomic(src_bv.bv_page); - dst_p = kmap_atomic(dst_bv.bv_page); - - memcpy(dst_p + dst_bv.bv_offset, - src_p + src_bv.bv_offset, - bytes); - - kunmap_atomic(dst_p); - kunmap_atomic(src_p); - - flush_dcache_page(dst_bv.bv_page); + struct bio_vec src_bv = bio_iter_iovec(src, *src_iter); + struct bio_vec dst_bv = bio_iter_iovec(dst, *dst_iter); + unsigned int bytes = min(src_bv.bv_len, dst_bv.bv_len); + void *src_buf; + + src_buf = bvec_kmap_local(&src_bv); + memcpy_to_bvec(&dst_bv, src_buf); + kunmap_local(src_buf); bio_advance_iter_single(src, src_iter, bytes); bio_advance_iter_single(dst, dst_iter, bytes);