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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,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 BC734C7618B for ; Fri, 26 Jul 2019 15:38:21 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 91D8A22BF5 for ; Fri, 26 Jul 2019 15:38:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564155501; bh=/oWQjJQQmCDYr67U7ui12mbfA/qqmrpQJfD2CzkxM84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=A+ScKZGIUbDM0KBiPyrMgcNuQa7ZdMOrQTsl64iDQ0VDM2Rhn9uSF95kI1U1ZPrMU 6Dt2i7ZMxI8MjEQuai3hom2NYfq8aOMfXmF2SpWfi7dRPJzxsheF2E246a7aRZpBLe X7pkiIfo/kUWzRafk07+WVn5i18eK0zjDZDNp1Tc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728374AbfGZPiR (ORCPT ); Fri, 26 Jul 2019 11:38:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:43000 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388489AbfGZP22 (ORCPT ); Fri, 26 Jul 2019 11:28:28 -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 E7C3622CBF; Fri, 26 Jul 2019 15:28:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564154907; bh=/oWQjJQQmCDYr67U7ui12mbfA/qqmrpQJfD2CzkxM84=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=JsO/h7+Felah0nK8H+J+0Rw3YCzLGD5th1fod8u+NSwnErJ2+pl2Vd/VwSa2ezhE7 bh4B17ZF9h5J8BDxxFI8Yp6gg5k7oPoUUcuWzBCoGnE3UZ+Xci204LrMqOxNyuZDXe 5FlrT6kaKC0TBHeo4q8wKmBzWBG8n/vvm/ZUCCDE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Christoph Hellwig , "Martin K. Petersen" , Damien Le Moal , Jens Axboe Subject: [PATCH 5.2 66/66] block: Limit zone array allocation size Date: Fri, 26 Jul 2019 17:25:05 +0200 Message-Id: <20190726152308.789643747@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190726152301.936055394@linuxfoundation.org> References: <20190726152301.936055394@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Damien Le Moal commit 26202928fafad8bda8b478edb7e62c885be623d7 upstream. Limit the size of the struct blk_zone array used in blk_revalidate_disk_zones() to avoid memory allocation failures leading to disk revalidation failure. Also further reduce the likelyhood of such failures by using kvcalloc() (that is vmalloc()) instead of allocating contiguous pages with alloc_pages(). Fixes: 515ce6061312 ("scsi: sd_zbc: Fix sd_zbc_report_zones() buffer allocation") Fixes: e76239a3748c ("block: add a report_zones method") Cc: stable@vger.kernel.org Reviewed-by: Christoph Hellwig Reviewed-by: Martin K. Petersen Signed-off-by: Damien Le Moal Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-zoned.c | 46 ++++++++++++++++++++++++++++++---------------- include/linux/blkdev.h | 5 +++++ 2 files changed, 35 insertions(+), 16 deletions(-) --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -14,6 +14,9 @@ #include #include #include +#include +#include +#include #include "blk.h" @@ -373,22 +376,25 @@ static inline unsigned long *blk_alloc_z * Allocate an array of struct blk_zone to get nr_zones zone information. * The allocated array may be smaller than nr_zones. */ -static struct blk_zone *blk_alloc_zones(int node, unsigned int *nr_zones) +static struct blk_zone *blk_alloc_zones(unsigned int *nr_zones) { - size_t size = *nr_zones * sizeof(struct blk_zone); - struct page *page; - int order; - - for (order = get_order(size); order >= 0; order--) { - page = alloc_pages_node(node, GFP_NOIO | __GFP_ZERO, order); - if (page) { - *nr_zones = min_t(unsigned int, *nr_zones, - (PAGE_SIZE << order) / sizeof(struct blk_zone)); - return page_address(page); - } + struct blk_zone *zones; + size_t nrz = min(*nr_zones, BLK_ZONED_REPORT_MAX_ZONES); + + /* + * GFP_KERNEL here is meaningless as the caller task context has + * the PF_MEMALLOC_NOIO flag set in blk_revalidate_disk_zones() + * with memalloc_noio_save(). + */ + zones = kvcalloc(nrz, sizeof(struct blk_zone), GFP_KERNEL); + if (!zones) { + *nr_zones = 0; + return NULL; } - return NULL; + *nr_zones = nrz; + + return zones; } void blk_queue_free_zone_bitmaps(struct request_queue *q) @@ -415,6 +421,7 @@ int blk_revalidate_disk_zones(struct gen unsigned long *seq_zones_wlock = NULL, *seq_zones_bitmap = NULL; unsigned int i, rep_nr_zones = 0, z = 0, nrz; struct blk_zone *zones = NULL; + unsigned int noio_flag; sector_t sector = 0; int ret = 0; @@ -427,6 +434,12 @@ int blk_revalidate_disk_zones(struct gen return 0; } + /* + * Ensure that all memory allocations in this context are done as + * if GFP_NOIO was specified. + */ + noio_flag = memalloc_noio_save(); + if (!blk_queue_is_zoned(q) || !nr_zones) { nr_zones = 0; goto update; @@ -443,7 +456,7 @@ int blk_revalidate_disk_zones(struct gen /* Get zone information and initialize seq_zones_bitmap */ rep_nr_zones = nr_zones; - zones = blk_alloc_zones(q->node, &rep_nr_zones); + zones = blk_alloc_zones(&rep_nr_zones); if (!zones) goto out; @@ -480,8 +493,9 @@ update: blk_mq_unfreeze_queue(q); out: - free_pages((unsigned long)zones, - get_order(rep_nr_zones * sizeof(struct blk_zone))); + memalloc_noio_restore(noio_flag); + + kvfree(zones); kfree(seq_zones_wlock); kfree(seq_zones_bitmap); --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -344,6 +344,11 @@ struct queue_limits { #ifdef CONFIG_BLK_DEV_ZONED +/* + * Maximum number of zones to report with a single report zones command. + */ +#define BLK_ZONED_REPORT_MAX_ZONES 8192U + extern unsigned int blkdev_nr_zones(struct block_device *bdev); extern int blkdev_report_zones(struct block_device *bdev, sector_t sector, struct blk_zone *zones,