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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED 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 46405C43381 for ; Fri, 29 Mar 2019 07:08:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 14B062173C for ; Fri, 29 Mar 2019 07:08:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728800AbfC2HIZ (ORCPT ); Fri, 29 Mar 2019 03:08:25 -0400 Received: from mx1.redhat.com ([209.132.183.28]:54096 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728796AbfC2HIZ (ORCPT ); Fri, 29 Mar 2019 03:08:25 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5E8D0308CF80; Fri, 29 Mar 2019 07:08:25 +0000 (UTC) Received: from localhost (ovpn-8-16.pek2.redhat.com [10.72.8.16]) by smtp.corp.redhat.com (Postfix) with ESMTP id 12E1661B6A; Fri, 29 Mar 2019 07:08:21 +0000 (UTC) From: Ming Lei To: Jens Axboe Cc: linux-block@vger.kernel.org, Ming Lei , ris Ostrovsky , Juergen Gross , xen-devel@lists.xenproject.org, Omar Sandoval , Christoph Hellwig Subject: [PATCH V3 02/10] block: avoid to break XEN by multi-page bvec Date: Fri, 29 Mar 2019 15:07:55 +0800 Message-Id: <20190329070803.10958-3-ming.lei@redhat.com> In-Reply-To: <20190329070803.10958-1-ming.lei@redhat.com> References: <20190329070803.10958-1-ming.lei@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Fri, 29 Mar 2019 07:08:25 +0000 (UTC) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org XEN has special page merge requirement, see xen_biovec_phys_mergeable(). We can't merge pages into one bvec simply for XEN. So move XEN's specific check on page merge into __bio_try_merge_page(), then abvoid to break XEN by multi-page bvec. Cc: ris Ostrovsky Cc: Juergen Gross Cc: xen-devel@lists.xenproject.org Cc: Omar Sandoval Cc: Christoph Hellwig Signed-off-by: Ming Lei --- block/bio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/bio.c b/block/bio.c index b64cedc7f87c..b2423e7aae08 100644 --- a/block/bio.c +++ b/block/bio.c @@ -776,6 +776,8 @@ bool __bio_try_merge_page(struct bio *bio, struct page *page, if (vec_end_addr + 1 != page_addr + off) return false; + if (xen_domain() && !xen_biovec_phys_mergeable(bv, page)) + return false; if (same_page && (vec_end_addr & PAGE_MASK) != page_addr) return false; -- 2.9.5