From patchwork Thu May 20 04:22:25 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Damien Le Moal X-Patchwork-Id: 12269017 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=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 8F377C433B4 for ; Thu, 20 May 2021 04:22:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 749FC611BD for ; Thu, 20 May 2021 04:22:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229788AbhETEYA (ORCPT ); Thu, 20 May 2021 00:24:00 -0400 Received: from esa4.hgst.iphmx.com ([216.71.154.42]:63405 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229978AbhETEYA (ORCPT ); Thu, 20 May 2021 00:24:00 -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=1621484559; x=1653020559; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=aVa7W8T6lKCbKI/ygLHjB1phf2zK6Oo7yLjeZw7C+Rk=; b=Nw4nbl5o60COMijYae++rd9Hm8kD2WVua8ivf6HkYBfTHr4JYE34F1m/ f1SCZSphM6pButW1ohQF3GpKT1FeyZ+HdbKvAoKj6ngiST1oZqibxNEhx dLqCL6RL9sSN6ayjGfWsho804BAH0RnLqCYFmPYJ7lRLTbLZSAOoSFZrH hYV6os1cO4UtzTAE7HEky/2MIjKYwAATS5zUXiiiCKt757X0NVJtgVk1E KseDHyFZTxSEDFqG+lo4qqCrkQB+1oA/AP0lwg++GFRrisUjxhxmuuK1h +YVfY/orcf9KDe8E+Csl0YI+IpNmWQmC2EtdEsw/oAsoLHpIoYToGGch+ g==; IronPort-SDR: bUMu9tfoRhJXkcILhI2knKGNawdXsHr8Wp4K/4pjS98aOtkPcoCgYblokspieBGmn0AGFETNtX KayLK7bLfX0qD2PNmJlIQYMw+bWxHHo6VemSguYa6xHdZbIRoC0XAAu4FbsZfaQxLtOn+PPUJs I5DcwYRcV8PI1dEohBegLqlpJMcTKbgSmTn63v236fwG6m+Y4D2GBpRoAOJHVUQ61zjbmv4LKO v2R8aBdcFHmg8M8l/ivxCTj2cWbDwPdbfmZyyq4WRmZYqSVsnZ9Te7VYMTu8u/2NrtUkGjph6P 0Pk= X-IronPort-AV: E=Sophos;i="5.82,313,1613404800"; d="scan'208";a="168105847" Received: from h199-255-45-14.hgst.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 20 May 2021 12:22:39 +0800 IronPort-SDR: NjQ6DjpQ3TnELLmMtFw9ejdS5K7A79bElUDnos2hV+MLAcCxmwUoH87e/DgGr9vnv6A0k+d1KP Mm5l49ieJv110po2W8ZTpuV1cH8dChHL6q8XC3Rd/WGgb5mk7kdVno3w5CUKbBzgt7I+1sapm8 v4Wrn7srIrDjNfVQJbs3za/rXyHxGOTESQ9YF6Ihzve8gJG0mEvJGmORIjTSOBWMf93iGVLHSi U8nXRJytGi61hYAFJpcTZOegYjhtEmtURJGrDM0gx1MqZxnyggv2+MDi/H1Of7HaVmxHPjsCX5 /PgBm7Y1EIpQvadqIoA1ClzQ Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 May 2021 21:02:16 -0700 IronPort-SDR: EcgtPPVTygsH3V0v7Emrr9J3ApOBd7B84hDHEv92sZCdLVTsv+90suF9sH+EOn0ruhHH8kTlEN 3DdwhRX+SkDcCahzp8aDfF4vbw5nelKPKqCDMzIINkI/ZKlfivVKKiO9C2Fvo8rGegzJQsncxY nVKVD/e48L+SDn7ekC87wmd5UoUVuPMxWjJ3GINP8VP0XAH92k8ACmzRhcXK3rk5APNHc0X5qz PGXpAdN/t8I25lljyPakU5sBTB//QBzPR5yrFltPk58ElfnasAHYS2kZH6ktHNjK+99gCHsJvE +gg= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip02.wdc.com with ESMTP; 19 May 2021 21:22:38 -0700 From: Damien Le Moal To: dm-devel@redhat.com, Mike Snitzer , linux-block@vger.kernel.org, Jens Axboe Subject: [PATCH v2 08/11] dm: Forbid requeue of writes to zones Date: Thu, 20 May 2021 13:22:25 +0900 Message-Id: <20210520042228.974083-9-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520042228.974083-1-damien.lemoal@wdc.com> References: <20210520042228.974083-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org A target map method requesting the requeue of a bio with DM_MAPIO_REQUEUE or completing it with DM_ENDIO_REQUEUE can cause unaligned write errors if the bio is a write operation targeting a sequential zone. If a zoned target request such a requeue, warn about it and kill the IO. The function dm_is_zone_write() is introduced to detect write operations to zoned targets. This change does not affect the target drivers supporting zoned devices and exposing a zoned device, namely dm-crypt, dm-linear and dm-flakey as none of these targets ever request a requeue. Signed-off-by: Damien Le Moal Reviewed-by: Hannes Reinecke --- drivers/md/dm-zone.c | 17 +++++++++++++++++ drivers/md/dm.c | 18 +++++++++++++++--- drivers/md/dm.h | 5 +++++ 3 files changed, 37 insertions(+), 3 deletions(-) diff --git a/drivers/md/dm-zone.c b/drivers/md/dm-zone.c index b42474043249..edc3bbb45637 100644 --- a/drivers/md/dm-zone.c +++ b/drivers/md/dm-zone.c @@ -104,6 +104,23 @@ int dm_report_zones(struct block_device *bdev, sector_t start, sector_t sector, } EXPORT_SYMBOL_GPL(dm_report_zones); +bool dm_is_zone_write(struct mapped_device *md, struct bio *bio) +{ + struct request_queue *q = md->queue; + + if (!blk_queue_is_zoned(q)) + return false; + + switch (bio_op(bio)) { + case REQ_OP_WRITE_ZEROES: + case REQ_OP_WRITE_SAME: + case REQ_OP_WRITE: + return !op_is_flush(bio->bi_opf) && bio_sectors(bio); + default: + return false; + } +} + void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q) { if (!blk_queue_is_zoned(q)) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 45d2dc2ee844..4426019a89cc 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -846,11 +846,15 @@ static void dec_pending(struct dm_io *io, blk_status_t error) * Target requested pushing back the I/O. */ spin_lock_irqsave(&md->deferred_lock, flags); - if (__noflush_suspending(md)) + if (__noflush_suspending(md) && + !WARN_ON_ONCE(dm_is_zone_write(md, bio))) /* NOTE early return due to BLK_STS_DM_REQUEUE below */ bio_list_add_head(&md->deferred, io->orig_bio); else - /* noflush suspend was interrupted. */ + /* + * noflush suspend was interrupted or this is + * a write to a zoned target. + */ io->status = BLK_STS_IOERR; spin_unlock_irqrestore(&md->deferred_lock, flags); } @@ -947,7 +951,15 @@ static void clone_endio(struct bio *bio) int r = endio(tio->ti, bio, &error); switch (r) { case DM_ENDIO_REQUEUE: - error = BLK_STS_DM_REQUEUE; + /* + * Requeuing writes to a sequential zone of a zoned + * target will break the sequential write pattern: + * fail such IO. + */ + if (WARN_ON_ONCE(dm_is_zone_write(md, bio))) + error = BLK_STS_IOERR; + else + error = BLK_STS_DM_REQUEUE; fallthrough; case DM_ENDIO_DONE: break; diff --git a/drivers/md/dm.h b/drivers/md/dm.h index fdf1536a4b62..39c243258e24 100644 --- a/drivers/md/dm.h +++ b/drivers/md/dm.h @@ -107,8 +107,13 @@ void dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q); #ifdef CONFIG_BLK_DEV_ZONED int dm_blk_report_zones(struct gendisk *disk, sector_t sector, unsigned int nr_zones, report_zones_cb cb, void *data); +bool dm_is_zone_write(struct mapped_device *md, struct bio *bio); #else #define dm_blk_report_zones NULL +static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio) +{ + return false; +} #endif /*-----------------------------------------------------------------