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=-8.8 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 07AF6C10F13 for ; Thu, 11 Apr 2019 06:24:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C688A204EC for ; Thu, 11 Apr 2019 06:24:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="mct2a0Hj" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726748AbfDKGYC (ORCPT ); Thu, 11 Apr 2019 02:24:02 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:60406 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726104AbfDKGYC (ORCPT ); Thu, 11 Apr 2019 02:24:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.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: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=FVgvu3JGv+wHf+tmRpI7ZTH4Ry+BhMOKZN66c6Xbxdo=; b=mct2a0Hjl5tcmyjvBWtwz7WGfI SyCOrJXllqOCOw073Jb2lHYVx54NTd+5M+MDeHwYCeA+j8JF0Vy2c6IPYkqkAV6XjQcQ64E1Q31xQ 2gcu207a/ApAxJFN0wmKpVjYWrZDnTEcJ3Jz0rYSloEhsXlpqR87/RWETI02om3J6Dd9GyjGJd8YZ Lkz9R+fAu4TYTAkwdQHI4xzT16iwrTiP6+dnC730g2cezvdG/pw1ff/4P54bxwO4bLa2dgK/Y/j58 usjOyKy4sPosDDmxHI5AHZA0LEkkjP9IQAYdOLgqMIf9YmggDG22VJkay/b6Zfb3G99ssZPlwZ8ro Q979zzsA==; Received: from 089144214194.atnat0023.highway.a1.net ([89.144.214.194] helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1hET7w-0005Li-9j; Thu, 11 Apr 2019 06:24:01 +0000 From: Christoph Hellwig To: Jens Axboe Cc: Ming Lei , linux-block@vger.kernel.org, Bart Van Assche , Johannes Thumshirn Subject: [PATCH 2/5] block: refactor __bio_iov_bvec_add_pages Date: Thu, 11 Apr 2019 08:23:28 +0200 Message-Id: <20190411062331.27800-3-hch@lst.de> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190411062331.27800-1-hch@lst.de> References: <20190411062331.27800-1-hch@lst.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Return early on error, and add an unlikely annotation for that case. Signed-off-by: Christoph Hellwig Reviewed-by: Bart Van Assche Reviewed-by: Johannes Thumshirn --- block/bio.c | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/block/bio.c b/block/bio.c index c2592c5d70b9..ad346082a971 100644 --- a/block/bio.c +++ b/block/bio.c @@ -873,20 +873,19 @@ static int __bio_iov_bvec_add_pages(struct bio *bio, struct iov_iter *iter) len = min_t(size_t, bv->bv_len - iter->iov_offset, iter->count); size = bio_add_page(bio, bv->bv_page, len, bv->bv_offset + iter->iov_offset); - if (size == len) { - if (!bio_flagged(bio, BIO_NO_PAGE_REF)) { - struct page *page; - int i; + if (unlikely(size != len)) + return -EINVAL; - mp_bvec_for_each_page(page, bv, i) - get_page(page); - } + if (!bio_flagged(bio, BIO_NO_PAGE_REF)) { + struct page *page; + int i; - iov_iter_advance(iter, size); - return 0; + mp_bvec_for_each_page(page, bv, i) + get_page(page); } - return -EINVAL; + iov_iter_advance(iter, size); + return 0; } #define PAGE_PTRS_PER_BVEC (sizeof(struct bio_vec) / sizeof(struct page *)) -- 2.20.1