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=-10.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 AB1F1C43387 for ; Fri, 11 Jan 2019 14:42:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7C0B621841 for ; Fri, 11 Jan 2019 14:42:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547217760; bh=zAUjmbnakdEAOukMuAN6RDNYv+t9bSVX6jLwyYqrXWw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=FF3WB87LayiVvLqsNXiSg7j6U3iUeAOT4o5n4x323QwVNBCrETCYh5aulJEksqrQW YH3NTQ//3Iyk0Og1w9eIX9vEdElyI7KB+RSI3XjapntuXd0zuEa4Sd1DQoKo2sBw4L ROQawfj/ak1hA3+adR8uACpXcXKNhKPTTEx09mls= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404209AbfAKOmj (ORCPT ); Fri, 11 Jan 2019 09:42:39 -0500 Received: from mail.kernel.org ([198.145.29.99]:35350 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2404166AbfAKOme (ORCPT ); Fri, 11 Jan 2019 09:42:34 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 5D7FB2063F; Fri, 11 Jan 2019 14:42:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1547217753; bh=zAUjmbnakdEAOukMuAN6RDNYv+t9bSVX6jLwyYqrXWw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MKBPA0enNvM1xfy7MRpe1EaSCee5QMFapLbWKSZprnsEX10qyYKkkfGbLWgSifKBO ibc8MpE9rYzroQEHGS9Qg2L3+HnpfV/eWVqU24QQzJvVUEb58XpwHloxGEFcxG3h2k hBjJ/TIXqkxNXjuy8Ls/Aer6l4N8z1c/rSlDXH5g= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jens Axboe , Jaegeuk Kim , Mike Snitzer Subject: [PATCH 4.20 28/65] dm: do not allow readahead to limit IO size Date: Fri, 11 Jan 2019 15:15:14 +0100 Message-Id: <20190111131100.218159212@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190111131055.331350141@linuxfoundation.org> References: <20190111131055.331350141@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jaegeuk Kim commit c6d6e9b0f6b4201c77f2cea3964dd122697e3543 upstream. Update DM to set the bdi's io_pages. This fixes reads to be capped at the device's max request size (even if user's read IO exceeds the established readahead setting). Fixes: 9491ae4a ("mm: don't cap request size based on read-ahead setting") Cc: stable@vger.kernel.org Reviewed-by: Jens Axboe Signed-off-by: Jaegeuk Kim Signed-off-by: Mike Snitzer Signed-off-by: Greg Kroah-Hartman --- drivers/md/dm-table.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1927,6 +1927,9 @@ void dm_table_set_restrictions(struct dm */ if (blk_queue_is_zoned(q)) blk_revalidate_disk_zones(t->md->disk); + + /* Allow reads to exceed readahead limits */ + q->backing_dev_info->io_pages = limits->max_sectors >> (PAGE_SHIFT - 9); } unsigned int dm_table_get_num_targets(struct dm_table *t)