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=-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,URIBL_BLOCKED,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 9E9A5C4708A for ; Tue, 25 May 2021 21:25:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D9CB611BE for ; Tue, 25 May 2021 21:25:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231838AbhEYV0p (ORCPT ); Tue, 25 May 2021 17:26:45 -0400 Received: from esa4.hgst.iphmx.com ([216.71.154.42]:36441 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232006AbhEYV0o (ORCPT ); Tue, 25 May 2021 17:26:44 -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=1621977914; x=1653513914; h=from:to:subject:date:message-id:in-reply-to:references: mime-version:content-transfer-encoding; bh=PPqL/jfrmA+hhRRrzr2vGOU3ZQvBfOeDHMkCng2K9OI=; b=N1sOZAKBfaEhE7xVAdYbN/3exz/Visps7jefV7fFdbJFGaL7D/mpkRCN i4qx248ESTps2dJJ1Fv1MNB5xVuR6vNO7BxccuhEqFQAPqaNkc/2hn1P7 lIRtQkCCqPjp2r+RxynUTR3jxDPNm4rL9XrFr53YNFmXKa92uHT8B9H8m 7rvlR5ch/tSDGSth+JxSDxSCd/QM3Y5xo9zZj5JfOmAnoQM4wqIdXs51a 5Uw7EXAkHa8fXis1CGo6TO/6K48dq/II45WwFlKksBaQ2f5sukfjf3qak vMXWx/5WdEkBDDNVbaMi0xPNOOjEPBeiVHEbjw1LozQ54BQ6TFaGZWrbe g==; IronPort-SDR: ExoThD2spBX1CdWo8RIKHmDvuEkYkvedXfuMiVNYgAAcbDCVCyv+tzwqJv/Pclrq3cfBbTx3jy WdGs+TuCjGGGebA1j2jKYneOCOQ8O4PBHfPs3czJIVZsaAjJSjO0BIdMckdi+OXNW08BoaSf0t kLvykNhf0jbzNRFeu9oc51aau5pyUZ51Hn8cxJdwcLnr/MNaTITD2tnGHzfRXWvl9bIRP54hQ3 D7BfJr03SYJ0dNX+sMSwWT6S6vmRYSgwmVUe72HnrXKcBh1IHfblBjAU4Mwe9wo2jjyxG/z/ZH jGk= X-IronPort-AV: E=Sophos;i="5.82,329,1613404800"; d="scan'208";a="168717537" Received: from uls-op-cesaip01.wdc.com (HELO uls-op-cesaep01.wdc.com) ([199.255.45.14]) by ob1.hgst.iphmx.com with ESMTP; 26 May 2021 05:25:14 +0800 IronPort-SDR: A8aIf2tOMFLex+0SpH3A29vIqlxouWPSpNGRNcsSjbeUWIKymMr04bIMV7s+SIi7maghkmb5Qn MpWZhr1PpDVmHpyTXlbJssOxXh2xbYqNQDz2bAe5wz3TWXVMSZBiPJlP1eodVo9UEjD/fyAxwH VCRj80SznwCIk+C/MhuzgRxLRcV4VbMF/WD1d+pxCo4Hzeexa9ucvUzUho6GgrhuxHd6o9J6Pt Udvls+P47mxcxjuXLWXWTu+9IvQeWH+HRuGwAtm8gBjU0mx5QWYu96QXw5w79qBZlkPzkcnUH3 5uq1seB6sDEeW07J4ILcEieo Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep01.wdc.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 May 2021 14:04:41 -0700 IronPort-SDR: FFF1c2FJ+cgQhwiu2tSFsJhXIDXOtA/SS6F6R1Iy5+bwYpMV7vaYEY7WPhSqBcsD8tMZkR9flM 99Ne8g2pnfyxWCGLrZkpx1PRwBUmLTH9oCqNOZUCCOw1WtLMkfbiij+gpskbG8opzpmObsaPXQ A00LILqLiLlzH9QEHCjEOElt6aqVLCrglHOFMM9LI5kd9t180Ntk5oYtuQ0J/CyNO0QmkBk/MG MS5+OopH4yZp3elwi2jYQnBYTwXU9a5vYn22BCOizO2XEH7REaNpp9UEbqwotRcYVQzqx8ZM1f WjU= WDCIronportException: Internal Received: from washi.fujisawa.hgst.com ([10.149.53.254]) by uls-op-cesaip01.wdc.com with ESMTP; 25 May 2021 14:25:13 -0700 From: Damien Le Moal To: dm-devel@redhat.com, Mike Snitzer , linux-block@vger.kernel.org, Jens Axboe Subject: [PATCH v5 08/11] dm: Forbid requeue of writes to zones Date: Wed, 26 May 2021 06:24:58 +0900 Message-Id: <20210525212501.226888-9-damien.lemoal@wdc.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210525212501.226888-1-damien.lemoal@wdc.com> References: <20210525212501.226888-1-damien.lemoal@wdc.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Himanshu Madhani --- 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 c49976cc4e44..ed8c5a8df2e5 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 /*----------------------------------------------------------------- -- 2.31.1