From nobody Thu Apr 2 23:53:33 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 D90213EFD2C for ; Thu, 26 Mar 2026 10:48:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774522124; cv=none; b=YI1OVWsIcCbhVyf8DQ9SlLHYp2KkjCug+6RtuWVrH4x6Sy/9mtUZ+hlkcPhjl4hbStm04zy6qpXpTisYkVFQe91PFZcM9AmbIHAlLX8uXyn2SlBbRpeb2d5OqDkjmyanutXYXz2TqXv07w8nLf6VmgDioJPSCTZagyNvMu41iAE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774522124; c=relaxed/simple; bh=ooJGB5pm2kKH1nS60havhbSkj8IMeaPspLWnYGj9zzg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MsAQY1SLlWXRP3HEh9SA+VVSzcoS2XFQ6YZ7YlCLM8+FssjJPa/b2ew2Gd2Mq3wNkKdNfXxrXGNTDmlUrLqDyXzsBVNaLN3+ufnhgZsqmUQnQOlpKDGMEG79YaqPN06AwbO803rQNpQ7n66GiwfNVLe/JuQviVoevkJ1DBHsW/w= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine 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=is25/9mA; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine 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="is25/9mA" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1774522121; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=eMP9bnV0yq18QtXiFKmTkxFw+bIJoptINTzT8/zA4D0=; b=is25/9mA8eVceG/S8f6xRz38TFtnXuchqdQM+SjoTK0jYXfOcZM+V9+uecUoF9owvXUGGd CewgkyB5nKh0J15HivnIsumVsuSSvcVy5ibYsausuG19QDXM3PuZPtHalRATDcy/+0kcoX zZ3wb+CE3BRszB/LU1eQasD/CrxmP2s= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-648-a-gXVbOYNM-z_sxtwygWsw-1; Thu, 26 Mar 2026 06:48:36 -0400 X-MC-Unique: a-gXVbOYNM-z_sxtwygWsw-1 X-Mimecast-MFC-AGG-ID: a-gXVbOYNM-z_sxtwygWsw_1774522114 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (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 mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F17C6180049D; Thu, 26 Mar 2026 10:48:33 +0000 (UTC) Received: from warthog.procyon.org.com (unknown [10.44.33.121]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 218C219560B1; Thu, 26 Mar 2026 10:48:26 +0000 (UTC) From: David Howells To: Christian Brauner , Matthew Wilcox , Christoph Hellwig Cc: David Howells , Paulo Alcantara , Jens Axboe , Leon Romanovsky , Steve French , ChenXiaoSong , Marc Dionne , Eric Van Hensbergen , Dominique Martinet , Ilya Dryomov , Trond Myklebust , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Paulo Alcantara , Shyam Prasad N , Tom Talpey Subject: [PATCH 17/26] cifs: Support ITER_BVECQ in smb_extract_iter_to_rdma() Date: Thu, 26 Mar 2026 10:45:32 +0000 Message-ID: <20260326104544.509518-18-dhowells@redhat.com> In-Reply-To: <20260326104544.509518-1-dhowells@redhat.com> References: <20260326104544.509518-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Content-Type: text/plain; charset="utf-8" Add support for ITER_BVECQ to smb_extract_iter_to_rdma(). Signed-off-by: David Howells cc: Paulo Alcantara cc: Matthew Wilcox cc: Christoph Hellwig cc: Steve French cc: Shyam Prasad N cc: Tom Talpey cc: linux-cifs@vger.kernel.org cc: netfs@lists.linux.dev cc: linux-fsdevel@vger.kernel.org --- fs/smb/client/smbdirect.c | 60 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c index c79304012b08..f8a6be83db98 100644 --- a/fs/smb/client/smbdirect.c +++ b/fs/smb/client/smbdirect.c @@ -3298,6 +3298,63 @@ static ssize_t smb_extract_folioq_to_rdma(struct iov= _iter *iter, return ret; } =20 +/* + * Extract memory fragments from a BVECQ-class iterator and add them to an= RDMA + * list. The folios are not pinned. + */ +static ssize_t smb_extract_bvecq_to_rdma(struct iov_iter *iter, + struct smb_extract_to_rdma *rdma, + ssize_t maxsize) +{ + const struct bvecq *bq =3D iter->bvecq; + unsigned int slot =3D iter->bvecq_slot; + ssize_t ret =3D 0; + size_t offset =3D iter->iov_offset; + + if (slot >=3D bq->nr_slots) { + bq =3D bq->next; + if (WARN_ON_ONCE(!bq)) + return -EIO; + slot =3D 0; + } + + do { + struct bio_vec *bv =3D &bq->bv[slot]; + struct page *page =3D bv->bv_page; + size_t bsize =3D bv->bv_len; + + if (offset < bsize) { + size_t part =3D umin(maxsize, bsize - offset); + + if (!smb_set_sge(rdma, page, bv->bv_offset + offset, part)) + return -EIO; + + offset +=3D part; + ret +=3D part; + maxsize -=3D part; + } + + if (offset >=3D bsize) { + offset =3D 0; + slot++; + if (slot >=3D bq->nr_slots) { + if (!bq->next) { + WARN_ON_ONCE(ret < iter->count); + break; + } + bq =3D bq->next; + slot =3D 0; + } + } + } while (rdma->nr_sge < rdma->max_sge && maxsize > 0); + + iter->bvecq =3D bq; + iter->bvecq_slot =3D slot; + iter->iov_offset =3D offset; + iter->count -=3D ret; + return ret; +} + /* * Extract page fragments from up to the given amount of the source iterat= or * and build up an RDMA list that refers to all of those bits. The RDMA l= ist @@ -3325,6 +3382,9 @@ static ssize_t smb_extract_iter_to_rdma(struct iov_it= er *iter, size_t len, case ITER_FOLIOQ: ret =3D smb_extract_folioq_to_rdma(iter, rdma, len); break; + case ITER_BVECQ: + ret =3D smb_extract_bvecq_to_rdma(iter, rdma, len); + break; default: WARN_ON_ONCE(1); return -EIO;