From nobody Sat Nov 23 17:58:55 2024 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 BC7961DED5A for ; Fri, 22 Nov 2024 15:11:26 +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=1732288288; cv=none; b=e6ipmfuWbfD3SUsPqZ01EhaEJ3+R//ISw/HiR5Fp23Dd2Zxum8MNh7qeRLLgPZ007kjg1JCfSB02YvljW1YJ+dmcoCyGzgMkzxpE1uzaqPphyXNGkENssccmRKw0xAgkiIu8fV4KFURO/Ex9rTbgKKP+tTy/8AuZ5kl4sw7AXHI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732288288; c=relaxed/simple; bh=Pn9mI/dQRJTaJqS3r4xCnRL05yuMMT3XBgLbATZWtGQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LnlP7zBRY5nhQTqH4RSoxyFuT83NXMfBMwTtxuyBnn1kiYswrSKEJjp+uUwTo0ZUzx9ueJM3xSsDYMY3s4mSdjf8cbY+j2xc7/ttzRMAHaR7GctH+FVOK9RBYLsno8EkjLpjTAGZb7gHuxjERFaH+/v9AyzW00CqNih7NUBFV1A= 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=Mau/O6Ae; arc=none smtp.client-ip=170.10.133.124 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="Mau/O6Ae" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732288286; 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=qNb3xWwgY1tmNqWYiqE8zMLxs0w6BlPv0Y++bDq5l+E=; b=Mau/O6AeG10qkLzGSmNA3CxK35pwtUorGohOJTx5cOomjzG0FpcjTR4vXBKT8bjYshOaL0 R2x/O042kX0YvuAfMsj7Uf2IVgu2yty+rI6yWtzBeBCp95Fg/kaOqNq6umAdtAQ+fkjFYN gi/r2ttNKU/3cZshOV4lVBISqG/UnYQ= Received: from mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-208-4gHOWNWnMuKkjr1N8XK0oQ-1; Fri, 22 Nov 2024 10:11:22 -0500 X-MC-Unique: 4gHOWNWnMuKkjr1N8XK0oQ-1 X-Mimecast-MFC-AGG-ID: 4gHOWNWnMuKkjr1N8XK0oQ 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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 111071955E91; Fri, 22 Nov 2024 15:11:18 +0000 (UTC) Received: from bcodding.csb.redhat.com (unknown [10.22.74.7]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id A4905195E481; Fri, 22 Nov 2024 15:11:16 +0000 (UTC) From: Benjamin Coddington To: Trond Myklebust , Anna Schumaker , Chuck Lever Cc: linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig Subject: [PATCH v4 2/2] nfs/blocklayout: Limit repeat device registration on failure Date: Fri, 22 Nov 2024 10:11:12 -0500 Message-ID: <015eaf84cc15050f8ef461777c59753ef5deb521.1732288202.git.bcodding@redhat.com> In-Reply-To: References: 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" Every pNFS SCSI IO wants to do LAYOUTGET, then within the layout find the device which can drive GETDEVINFO, then finally may need to prep the device with a reservation. This slow work makes a mess of IO latencies if one of the later steps is going to fail for awhile. If we're unable to register a SCSI device, ensure we mark the device as unavailable so that it will timeout and be re-added via GETDEVINFO. This avoids repeated doomed attempts to register a device in the IO path. Add some clarifying comments as well. Fixes: d869da91cccb ("nfs/blocklayout: Fix premature PR key unregistration") Signed-off-by: Benjamin Coddington Reviewed-by: Christoph Hellwig Reviewed-by: Chuck Lever --- fs/nfs/blocklayout/blocklayout.c | 15 ++++++++++++++- 1 file changed, 14 insertions(+), 1 deletion(-) diff --git a/fs/nfs/blocklayout/blocklayout.c b/fs/nfs/blocklayout/blocklay= out.c index 0becdec12970..47189476b553 100644 --- a/fs/nfs/blocklayout/blocklayout.c +++ b/fs/nfs/blocklayout/blocklayout.c @@ -571,19 +571,32 @@ bl_find_get_deviceid(struct nfs_server *server, if (!node) return ERR_PTR(-ENODEV); =20 + /* + * Devices that are marked unavailable are left in the cache with a + * timeout to avoid sending GETDEVINFO after every LAYOUTGET, or + * constantly attempting to register the device. Once marked as + * unavailable they must be deleted and never reused. + */ if (test_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags)) { unsigned long end =3D jiffies; unsigned long start =3D end - PNFS_DEVICE_RETRY_TIMEOUT; =20 if (!time_in_range(node->timestamp_unavailable, start, end)) { + /* Uncork subsequent GETDEVINFO operations for this device */ nfs4_delete_deviceid(node->ld, node->nfs_client, id); goto retry; } goto out_put; } =20 - if (!bl_register_dev(container_of(node, struct pnfs_block_dev, node))) + if (!bl_register_dev(container_of(node, struct pnfs_block_dev, node))) { + /* + * If we cannot register, treat this device as transient: + * Make a negative cache entry for the device + */ + nfs4_mark_deviceid_unavailable(node); goto out_put; + } =20 return node; =20 --=20 2.47.0