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=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 0CDE0C10F13 for ; Thu, 11 Apr 2019 21:10:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D1A33218A6 for ; Thu, 11 Apr 2019 21:10:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726917AbfDKVIs (ORCPT ); Thu, 11 Apr 2019 17:08:48 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59260 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726763AbfDKVIs (ORCPT ); Thu, 11 Apr 2019 17:08:48 -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 BBE38368E6; Thu, 11 Apr 2019 21:08:47 +0000 (UTC) Received: from localhost.localdomain.com (unknown [10.20.6.236]) by smtp.corp.redhat.com (Postfix) with ESMTP id 492F15C21E; Thu, 11 Apr 2019 21:08:46 +0000 (UTC) From: jglisse@redhat.com To: linux-kernel@vger.kernel.org Cc: =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org, John Hubbard , Jan Kara , Dan Williams , Alexander Viro , Johannes Thumshirn , Christoph Hellwig , Jens Axboe , Ming Lei , Dave Chinner , Jason Gunthorpe , Matthew Wilcox Subject: [PATCH v1 02/15] iov_iter: add helper to test if an iter would use GUP Date: Thu, 11 Apr 2019 17:08:21 -0400 Message-Id: <20190411210834.4105-3-jglisse@redhat.com> In-Reply-To: <20190411210834.4105-1-jglisse@redhat.com> References: <20190411210834.4105-1-jglisse@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 [10.5.110.30]); Thu, 11 Apr 2019 21:08:48 +0000 (UTC) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: Jérôme Glisse Add an helper to test if call to iov_iter_get_pages*() with a given iter would result in calls to GUP (get_user_pages*()). We want to track differently page reference if they are coming from GUP and thus we need to know when GUP is use for a given iter. Signed-off-by: Jérôme Glisse Cc: linux-fsdevel@vger.kernel.org Cc: linux-block@vger.kernel.org Cc: linux-mm@kvack.org Cc: John Hubbard Cc: Jan Kara Cc: Dan Williams Cc: Alexander Viro Cc: Johannes Thumshirn Cc: Christoph Hellwig Cc: Jens Axboe Cc: Ming Lei Cc: Dave Chinner Cc: Jason Gunthorpe Cc: Matthew Wilcox --- include/linux/uio.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/uio.h b/include/linux/uio.h index f184af1999a8..b12b2878a266 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -98,6 +98,17 @@ static inline bool iov_iter_bvec_no_ref(const struct iov_iter *i) return (i->type & ITER_BVEC_FLAG_NO_REF) != 0; } +/** + * iov_iter_get_pages_use_gup - true if iov_iter_get_pages(i) use GUP + * @i: iter + * Returns: true if a call to iov_iter_get_pages*() with the iter provided in + * argument would result in the use of get_user_pages*() + */ +static inline bool iov_iter_get_pages_use_gup(const struct iov_iter *i) +{ + return iov_iter_type(i) & (ITER_IOVEC | ITER_PIPE); +} + /* * Total number of bytes covered by an iovec. * -- 2.20.1