From patchwork Thu Jun 27 02:49:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 11018685 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 241D01932 for ; Thu, 27 Jun 2019 02:49:18 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 16F4A286FE for ; Thu, 27 Jun 2019 02:49:18 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0B0A728A2D; Thu, 27 Jun 2019 02:49:18 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.7 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A771D286FE for ; Thu, 27 Jun 2019 02:49:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726970AbfF0CtQ (ORCPT ); Wed, 26 Jun 2019 22:49:16 -0400 Received: from esa1.hgst.iphmx.com ([68.232.141.245]:35004 "EHLO esa1.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726962AbfF0CtQ (ORCPT ); Wed, 26 Jun 2019 22:49:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1561603755; x=1593139755; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=lg8pbEXqIGRxgTLVtp82Eq91m5uzXzwMVXBnCRVLznI=; b=NiW545gH2omc/buw7VwX6ruBCVzZg8OCBGfOUy1NQZbPxby9QVNgsFyq G60KbtjXtWZ9lLxsHUdpf5Jm30XCKdTyzcdqATi0MhvWAK0ru5XsnSv3K kLJJgQHFnlWRFnH5uJToOYR+Yz/ItV7gzp9SrYWdkAevi0Bcxwr4RToJH XqtPfj2p4KLOQSyB5uVs2Ic8zlv0ZgGQVCacW63YZPeNl66WCOYv/8kwp Y9rINzzUBmOaC2BKndHBfRb22xGH5pI75ZF8IbxSP6S3FvKWWYJWA22EC nnoqG5kQTAAbLunPba+wQS5PgplHXRVcm2L1EoEwIFy34FEXZ4QNufhK7 A==; X-IronPort-AV: E=Sophos;i="5.63,422,1557158400"; d="scan'208";a="218022033" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 27 Jun 2019 10:49:15 +0800 IronPort-SDR: DYd6rgX/eTMCl5tvCyLWEO2p+wohGgxS9B8pusCbhLGN+414JTn4IX5NTl6vsLezm/EPelx5s7 P1lkTkAfEj3yUJx+Cs24ijrmRscEciUamIiym4GY6dGofUAaRKmZlPlDce4Gn4ek3Ng4GXV/bc cxGvJMz9oGCZoEYPA7NNU8ikeqltFTjiEvPD/riw4XNLLQso8efPOSfyM2wjdtFdcmMyF7b6w1 31fMOv33xV3vYcHMC4WgpWupuvH7YehlvZTISJClxHGYJRcGDVoaiAzNxIpFsIqGxQ3U8uchrJ QVsnq4LbJMDR35qyNAZk/ZV2 Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP; 26 Jun 2019 19:48:24 -0700 IronPort-SDR: l7Q8eErx4O47E08s4VUeN4+1j05XjzrDcO/8OSqhR3Wq6y/kPfq4USFc3NfsLABvaLhOW9/UXM S97qAus7EP/h+saCFDvENc85isKBO7n5VkEa4Dczf9yDUKD2MpkbVDxeA8N8tEAN566jafBwDM eZGoM03qBqXwF8ziTlFCpichdx+Lo/CcMjL15aQhbyYgUMzb6CT7Lrmy99IP+p4Lc8f8/cQGRF Crpj0+/wnVes0JmD2l7u0jj5pXGM7/TOgjvynSuoz0sliE34C7I4/gpjuzKVKCH1tjlZxaRkaR WzI= Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 26 Jun 2019 19:49:15 -0700 From: Damien Le Moal To: linux-scsi@vger.kernel.org, "Martin K . Petersen" , linux-block@vger.kernel.org, Jens Axboe Cc: Christoph Hellwig , Bart Van Assche Subject: [PATCH V4 3/3] block: Limit zone array allocation size Date: Thu, 27 Jun 2019 11:49:10 +0900 Message-Id: <20190627024910.23987-4-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190627024910.23987-1-damien.lemoal@wdc.com> References: <20190627024910.23987-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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. Further reduce the likelyhood of these failures by using kvmalloc() instead of directly allocating contiguous 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 Signed-off-by: Damien Le Moal Reviewed-by: Bart Van Assche --- block/blk-zoned.c | 29 +++++++++++++---------------- include/linux/blkdev.h | 5 +++++ 2 files changed, 18 insertions(+), 16 deletions(-) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index ae7e91bd0618..26f878b9b5f5 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -373,22 +373,20 @@ static inline unsigned long *blk_alloc_zone_bitmap(int node, * 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); + + zones = kvcalloc(nrz, sizeof(struct blk_zone), GFP_NOIO); + if (!zones) { + *nr_zones = 0; + return NULL; } - return NULL; + *nr_zones = nrz; + + return zones; } void blk_queue_free_zone_bitmaps(struct request_queue *q) @@ -443,7 +441,7 @@ int blk_revalidate_disk_zones(struct gendisk *disk) /* 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 +478,7 @@ int blk_revalidate_disk_zones(struct gendisk *disk) blk_mq_unfreeze_queue(q); out: - free_pages((unsigned long)zones, - get_order(rep_nr_zones * sizeof(struct blk_zone))); + kvfree(zones); kfree(seq_zones_wlock); kfree(seq_zones_bitmap); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 592669bcc536..f7faac856017 100644 --- 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,