From patchwork Mon Jun 12 16:51:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Howells X-Patchwork-Id: 13276975 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 22EF9C88CB4 for ; Mon, 12 Jun 2023 16:52:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237253AbjFLQwP (ORCPT ); Mon, 12 Jun 2023 12:52:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45378 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234788AbjFLQwM (ORCPT ); Mon, 12 Jun 2023 12:52:12 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C522FE77 for ; Mon, 12 Jun 2023 09:51:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686588691; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=KUdFKCdBRtXD70pPEw8UKzishmgLHxiTnsybrG/P/8Q=; b=HG0wGPwFuB+pdkmE6BW5LD9jo25cJjFQzPZtkjs7pHgK9yfIlAYTfpFTGgzbFngRr0TjZN /uU9akSonP4T/cQHFYJ8JYLCdvFtpal/0zl3R6aHo0fLG/lXhQzbc7GqNkKIytNkHU/ac8 Du247MD6tkNyY5Bq6M7SiAGTaRU0aUc= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-557-3Bd9b2jJP1qS--WMQacq3A-1; Mon, 12 Jun 2023 12:51:25 -0400 X-MC-Unique: 3Bd9b2jJP1qS--WMQacq3A-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.rdu2.redhat.com [10.11.54.4]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D2BFA85A5AA; Mon, 12 Jun 2023 16:51:24 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.42.28.67]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1088720234B3; Mon, 12 Jun 2023 16:51:21 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: Jens Axboe , David Hildenbrand , kernel test robot cc: dhowells@redhat.com, Christoph Hellwig , Andrew Morton , Al Viro , Matthew Wilcox , Jan Kara , Jeff Layton , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , Lorenzo Stoakes , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-mm@kvack.org, oe-lkp@lists.linux.dev, lkp@intel.com, linux-kernel@vger.kernel.org Subject: [PATCH] block: Fix dio_bio_alloc() to set BIO_PAGE_PINNED MIME-Version: 1.0 Content-ID: <431928.1686588681.1@warthog.procyon.org.uk> Date: Mon, 12 Jun 2023 17:51:21 +0100 Message-ID: <431929.1686588681@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.4 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Fix dio_bio_alloc() to set BIO_PAGE_PINNED, not BIO_PAGE_REFFED, so that the bio code unpins the pinned pages rather than putting a ref on them. The issue was causing: WARNING: CPU: 6 PID: 2220 at mm/gup.c:76 try_get_folio This can be caused by creating a file on a loopback UDF filesystem, opening it O_DIRECT and making two writes to it from the same source buffer. Fixes: 1ccf164ec866 ("block: Use iov_iter_extract_pages() and page pinning in direct-io.c") Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-lkp/202306120931.a9606b88-oliver.sang@intel.com Signed-off-by: David Howells cc: Christoph Hellwig cc: David Hildenbrand cc: Andrew Morton cc: Jens Axboe cc: Al Viro cc: Matthew Wilcox cc: Jan Kara cc: Jeff Layton cc: Jason Gunthorpe cc: Logan Gunthorpe cc: Hillf Danton cc: Christian Brauner cc: Linus Torvalds cc: linux-fsdevel@vger.kernel.org cc: linux-block@vger.kernel.org cc: linux-kernel@vger.kernel.org cc: linux-mm@kvack.org --- fs/direct-io.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/direct-io.c b/fs/direct-io.c index 14049204cac8..04e810826ee8 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -415,7 +415,8 @@ dio_bio_alloc(struct dio *dio, struct dio_submit *sdio, else bio->bi_end_io = dio_bio_end_io; /* for now require references for all pages */ - bio_set_flag(bio, BIO_PAGE_REFFED); + if (dio->need_unpin) + bio_set_flag(bio, BIO_PAGE_PINNED); sdio->bio = bio; sdio->logical_offset_in_bio = sdio->cur_page_fs_offset; }