From patchwork Fri Jun 30 13:18:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Benjamin Coddington X-Patchwork-Id: 13298196 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 465CEEB64D7 for ; Fri, 30 Jun 2023 13:19:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232535AbjF3NTS (ORCPT ); Fri, 30 Jun 2023 09:19:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232571AbjF3NTL (ORCPT ); Fri, 30 Jun 2023 09:19:11 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 651D33A98 for ; Fri, 30 Jun 2023 06:18:21 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1688131100; 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; bh=7+h+cT0KLIqwZmvYcotSB3FClbMsUogxCPafGAVI4zE=; b=FctjwbiaZhN8/uF5ewWm2t+5IsyPU+4IY7R7yfJowMXuWk6EPc2g0NF3SaJh+2k48mWHL5 k/MET92Cy/2qYP5m1lBTvCYQMFUh2XdcCGZXfjo8b33a0327R/k+gVwuCvqk2lREO0ogUX eaDgp7OfHI3eQCCe8Ztf+7VRf8bF2do= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-355-00DxZ6I1N36hx4SD5dwAcA-1; Fri, 30 Jun 2023 09:18:15 -0400 X-MC-Unique: 00DxZ6I1N36hx4SD5dwAcA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 56C0C856F67; Fri, 30 Jun 2023 13:18:14 +0000 (UTC) Received: from bcodding.csb.redhat.com (unknown [10.22.50.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id D7F271121314; Fri, 30 Jun 2023 13:18:13 +0000 (UTC) From: Benjamin Coddington To: trond.myklebust@hammerspace.com, anna@kernel.org Cc: Olga.Kornievskaia@netapp.com, linux-nfs@vger.kernel.org Subject: [PATCH v2] NFSv4: Fix dropped lock for racing OPEN and delegation return Date: Fri, 30 Jun 2023 09:18:13 -0400 Message-Id: <50f5a8389be39630e9babeb9caba8377773c1cf2.1688131022.git.bcodding@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org Commmit f5ea16137a3f ("NFSv4: Retry LOCK on OLD_STATEID during delegation return") attempted to solve this problem by using nfs4's generic async error handling, but introduced a regression where v4.0 lock recovery would hang. The additional complexity introduced by overloading that error handling is not necessary for this case. This patch expects that commit to be reverted. The problem as originally explained in the above commit is: There's a small window where a LOCK sent during a delegation return can race with another OPEN on client, but the open stateid has not yet been updated. In this case, the client doesn't handle the OLD_STATEID error from the server and will lose this lock, emitting: "NFS: nfs4_handle_delegation_recall_error: unhandled error -10024". Fix this by using the old_stateid refresh helpers if the server replies with OLD_STATEID. Suggested-by: Trond Myklebust Signed-off-by: Benjamin Coddington --- fs/nfs/nfs4proc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 6bb14f6cfbc0..bdfb4ac144d2 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -7180,8 +7180,15 @@ static void nfs4_lock_done(struct rpc_task *task, void *calldata) } else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid)) goto out_restart; break; - case -NFS4ERR_BAD_STATEID: case -NFS4ERR_OLD_STATEID: + if (data->arg.new_lock_owner != 0 && + nfs4_refresh_open_old_stateid(&data->arg.open_stateid, + lsp->ls_state)) + goto out_restart; + if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp)) + goto out_restart; + fallthrough; + case -NFS4ERR_BAD_STATEID: case -NFS4ERR_STALE_STATEID: case -NFS4ERR_EXPIRED: if (data->arg.new_lock_owner != 0) {