From patchwork Wed May 15 13:28:11 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mikulas Patocka X-Patchwork-Id: 13665268 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F3D513B79F for ; Wed, 15 May 2024 13:28:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715779699; cv=none; b=l5khzqcUjjhlSA/VlGeai5UwdcyMSNGLyGSiPSCrHRNG/SiOxUsOr7y4BaIUX7EsPbYxA9sDsHcMC41fK3F/+0LsKtJRb5feT1wAH1orEIsfdvO9B5ooAhP/4mlTKrY0+Nv3NpS1jaNya3x040cq0cPGAop0MTI8qkt+gIhNVWI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715779699; c=relaxed/simple; bh=c1s/ChPEWjeYaCcWT5BGGTny3AQJNJBDAv0mOTQCEjg=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=ntAedQyLTaclf/wAlaBHsPWqEmZHqSMcIK0OwqVGqWB6sFwRLJwhl5VRQtcsTEsUgOPYaHrUeGEQnjJ9ENIVYLIO8ilM2BjejVQEhCDrb5Ps9xANpNU15OOgoFk6PyI7vRPLVr6XeN3NSG4ntTLRudETOrvzHIlW3hJmx6dg1BM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=dHO2RF8E; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="dHO2RF8E" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1715779696; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=hz6lTYCBMfcRqN5lko8/5I1zjYUwBVWLz+S/YZLt6OU=; b=dHO2RF8ElKJkrpFkFvVjtPOYRxTIR9GpMa7b0DRwNVEDCTRi9lJ0qEYZE/jRJRctg9ONZr EAjzja4rx7HferSyorT6+Q3CNfFTm/0bTGTx8Y4je4VIWn8w+EYgWfddKZD038xC9OA+cc suDQjB3JNr2bQkRwVldigLcQKkz7x3I= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-299-za2xWXZHMIqU8DMduOKdeg-1; Wed, 15 May 2024 09:28:12 -0400 X-MC-Unique: za2xWXZHMIqU8DMduOKdeg-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A9107803796; Wed, 15 May 2024 13:28:11 +0000 (UTC) Received: from file1-rdu.file-001.prod.rdu2.dc.redhat.com (unknown [10.11.5.21]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 9FC6440105B; Wed, 15 May 2024 13:28:11 +0000 (UTC) Received: by file1-rdu.file-001.prod.rdu2.dc.redhat.com (Postfix, from userid 12668) id 9990A30C7280; Wed, 15 May 2024 13:28:11 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by file1-rdu.file-001.prod.rdu2.dc.redhat.com (Postfix) with ESMTP id 98CFE3FB52; Wed, 15 May 2024 15:28:11 +0200 (CEST) Date: Wed, 15 May 2024 15:28:11 +0200 (CEST) From: Mikulas Patocka To: Jens Axboe , Keith Busch , Christoph Hellwig , Sagi Grimberg , Mike Snitzer , Milan Broz cc: linux-block@vger.kernel.org, dm-devel@lists.linux.dev, linux-nvme@lists.infradead.org Subject: [RFC PATCH 1/2] block: change rq_integrity_vec to respect the iterator In-Reply-To: Message-ID: References: Precedence: bulk X-Mailing-List: dm-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 If we allocate a bio that is larger than NVMe maximum request size, attach integrity metadata to it and send it to the NVMe subsystem, the integrity metadata will be corrupted. Splitting the bio works correctly. The function bio_split will clone the bio, trim the iterator of the first bio and advance the iterator of the second bio. However, the function rq_integrity_vec has a bug - it returns the first vector of the bio's metadata and completely disregards the metadata iterator that was advanced when the bio was split. Thus, the second bio uses the same metadata as the first bio and this leads to metadata corruption. This commit changes rq_integrity_vec, so that it calls mp_bvec_iter_bvec instead of returning the first vector. mp_bvec_iter_bvec reads the iterator and advances the vector by the iterator. Signed-off-by: Mikulas Patocka --- drivers/nvme/host/pci.c | 6 +++--- include/linux/blk-integrity.h | 12 ++++++------ 2 files changed, 9 insertions(+), 9 deletions(-) Index: linux-2.6/drivers/nvme/host/pci.c =================================================================== --- linux-2.6.orig/drivers/nvme/host/pci.c +++ linux-2.6/drivers/nvme/host/pci.c @@ -825,9 +825,9 @@ static blk_status_t nvme_map_metadata(st struct nvme_command *cmnd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + struct bio_vec bv = rq_integrity_vec(req); - iod->meta_dma = dma_map_bvec(dev->dev, rq_integrity_vec(req), - rq_dma_dir(req), 0); + iod->meta_dma = dma_map_bvec(dev->dev, &bv, rq_dma_dir(req), 0); if (dma_mapping_error(dev->dev, iod->meta_dma)) return BLK_STS_IOERR; cmnd->rw.metadata = cpu_to_le64(iod->meta_dma); @@ -966,7 +966,7 @@ static __always_inline void nvme_pci_unm struct nvme_iod *iod = blk_mq_rq_to_pdu(req); dma_unmap_page(dev->dev, iod->meta_dma, - rq_integrity_vec(req)->bv_len, rq_dma_dir(req)); + rq_integrity_vec(req).bv_len, rq_dma_dir(req)); } if (blk_rq_nr_phys_segments(req)) Index: linux-2.6/include/linux/blk-integrity.h =================================================================== --- linux-2.6.orig/include/linux/blk-integrity.h +++ linux-2.6/include/linux/blk-integrity.h @@ -109,11 +109,11 @@ static inline bool blk_integrity_rq(stru * Return the first bvec that contains integrity data. Only drivers that are * limited to a single integrity segment should use this helper. */ -static inline struct bio_vec *rq_integrity_vec(struct request *rq) +static inline struct bio_vec rq_integrity_vec(struct request *rq) { - if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1)) - return NULL; - return rq->bio->bi_integrity->bip_vec; + WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1); + return mp_bvec_iter_bvec(rq->bio->bi_integrity->bip_vec, + rq->bio->bi_integrity->bip_iter); } #else /* CONFIG_BLK_DEV_INTEGRITY */ static inline int blk_rq_count_integrity_sg(struct request_queue *q, @@ -177,9 +177,9 @@ static inline int blk_integrity_rq(struc return 0; } -static inline struct bio_vec *rq_integrity_vec(struct request *rq) +static inline struct bio_vec rq_integrity_vec(struct request *rq) { - return NULL; + BUG(); } #endif /* CONFIG_BLK_DEV_INTEGRITY */ #endif /* _LINUX_BLK_INTEGRITY_H */