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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 87B11C2BB55 for ; Thu, 16 Apr 2020 15:47:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5885520732 for ; Thu, 16 Apr 2020 15:47:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587052079; bh=rcjh3l3DjFWYTa13HVk4wQSTUrOgmQ2s6RvdNQnB9Cg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=2kBMj78ZK9uIIFlvP0pW2pAyRUkW6OTnusWbMKdcB7lBJpQLjB30YEEJ4IHriIXsD UKr1GCBGn8aQXAGZ+iPyOnfNBEgH+9zasXzo+Kikaj5Dt6uiG6pFqSjogDJLUgUut+ Mfd8uGcoCjk5/zGxkcx0Gq8+oOg5R/AG/5PhQXoc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2410570AbgDPPrw (ORCPT ); Thu, 16 Apr 2020 11:47:52 -0400 Received: from mail.kernel.org ([198.145.29.99]:44778 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2896725AbgDPNdd (ORCPT ); Thu, 16 Apr 2020 09:33:33 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 9E138221F7; Thu, 16 Apr 2020 13:33:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044013; bh=rcjh3l3DjFWYTa13HVk4wQSTUrOgmQ2s6RvdNQnB9Cg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CsQXGV9PSkJRUvJrFg0bj3bEMAUl4g6wwF1cdPzvwl1IpwvOLhRw42WZuIWR2X04q o+0jW36dVUhUi8l4l/QF4U75t1buZelzaYzIzUKdPcgUx3riDc17A/QWc8SnyD4LIy lgIfMTHAZ2vq+ExUlzpsZ6YPN4fD9HgD4vnA77dk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Paul Menzel , Bob Liu , Konstantin Khlebnikov , Song Liu , Sasha Levin Subject: [PATCH 5.5 046/257] block: keep bdi->io_pages in sync with max_sectors_kb for stacked devices Date: Thu, 16 Apr 2020 15:21:37 +0200 Message-Id: <20200416131331.693890006@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Konstantin Khlebnikov [ Upstream commit e74d93e96d721c4297f2a900ad0191890d2fc2b0 ] Field bdi->io_pages added in commit 9491ae4aade6 ("mm: don't cap request size based on read-ahead setting") removes unneeded split of read requests. Stacked drivers do not call blk_queue_max_hw_sectors(). Instead they set limits of their devices by blk_set_stacking_limits() + disk_stack_limits(). Field bio->io_pages stays zero until user set max_sectors_kb via sysfs. This patch updates io_pages after merging limits in disk_stack_limits(). Commit c6d6e9b0f6b4 ("dm: do not allow readahead to limit IO size") fixed the same problem for device-mapper devices, this one fixes MD RAIDs. Fixes: 9491ae4aade6 ("mm: don't cap request size based on read-ahead setting") Reviewed-by: Paul Menzel Reviewed-by: Bob Liu Signed-off-by: Konstantin Khlebnikov Signed-off-by: Song Liu Signed-off-by: Sasha Levin --- block/blk-settings.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-settings.c b/block/blk-settings.c index c8eda2e7b91e4..be1dca0103a45 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -664,6 +664,9 @@ void disk_stack_limits(struct gendisk *disk, struct block_device *bdev, printk(KERN_NOTICE "%s: Warning: Device %s is misaligned\n", top, bottom); } + + t->backing_dev_info->io_pages = + t->limits.max_sectors >> (PAGE_SHIFT - 9); } EXPORT_SYMBOL(disk_stack_limits); -- 2.20.1