From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 5867A26F45E; Tue, 8 Apr 2025 12:31:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744115501; cv=none; b=cR8mSUU2PpMuDsgeK0oFau2Sy71rCD+oc95pxYCPBFApeKUPxZ+EFWKNaqf9a1itXDs7U1P7L0cQYDd+g/Cp+wTPPbXlF/OSa4ezsr5geJeaBZFc8INejX+PfnH/87J8M54uLjx1SDWNync6QXrGeMzpr9arYB5DNZjwm6prcWI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744115501; c=relaxed/simple; bh=gWe62c0v78AOeYwJ4CyISnM490CYKgLYao9RlUqTnLk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pIaNtj1pu5gXWY9IzsNSHYoFdVTQnyXqaubqH3VwMps3kRMKcet3NFrd6dsGRS8ny1S8QO1lV5ILOilQwFyKDqFLkOaGN1H+G67GeoMm4ZyLzDG8bfFPicNDkpVMeIpr+cM/otlt30akOwDWuuFitQdfQ0SQeYfmyc0Os64Q26s= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=NRJA9ntA; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="NRJA9ntA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBB10C4CEE7; Tue, 8 Apr 2025 12:31:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744115501; bh=gWe62c0v78AOeYwJ4CyISnM490CYKgLYao9RlUqTnLk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NRJA9ntAkuEbbjogeDna+QVP+vo3aNUWwLv1r/k20C36tI8oZ2ZVHjsiaW76KsMkt lfHaqAn0S07aN527iIQnafFx1zFqT4lneEuT6BQSH0nhMNkKiC4mMxFBb8KFgHpeeS hwcahljhK21UfuR1rGxSun0SUahOdWFBJm86BJDI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeff Layton , Chuck Lever Subject: [PATCH 6.13 497/499] NFSD: Skip sending CB_RECALL_ANY when the backchannel isnt up Date: Tue, 8 Apr 2025 12:51:49 +0200 Message-ID: <20250408104903.757083746@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104851.256868745@linuxfoundation.org> References: <20250408104851.256868745@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chuck Lever commit 8a388c1fabeb6606e16467b23242416c0dbeffad upstream. NFSD sends CB_RECALL_ANY to clients when the server is low on memory or that client has a large number of delegations outstanding. We've seen cases where NFSD attempts to send CB_RECALL_ANY requests to disconnected clients, and gets confused. These calls never go anywhere if a backchannel transport to the target client isn't available. Before the server can send any backchannel operation, the client has to connect first and then do a BIND_CONN_TO_SESSION. This patch doesn't address the root cause of the confusion, but there's no need to queue up these optional operations if they can't go anywhere. Fixes: 44df6f439a17 ("NFSD: add delegation reaper to react to low memory condition") Reviewed-by: Jeff Layton Cc: stable@vger.kernel.org Signed-off-by: Chuck Lever Signed-off-by: Greg Kroah-Hartman --- fs/nfsd/nfs4state.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -6721,14 +6721,19 @@ deleg_reaper(struct nfsd_net *nn) spin_lock(&nn->client_lock); list_for_each_safe(pos, next, &nn->client_lru) { clp = list_entry(pos, struct nfs4_client, cl_lru); - if (clp->cl_state != NFSD4_ACTIVE || - list_empty(&clp->cl_delegations) || - atomic_read(&clp->cl_delegs_in_recall) || - test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags) || - (ktime_get_boottime_seconds() - - clp->cl_ra_time < 5)) { + + if (clp->cl_state != NFSD4_ACTIVE) + continue; + if (list_empty(&clp->cl_delegations)) + continue; + if (atomic_read(&clp->cl_delegs_in_recall)) + continue; + if (test_bit(NFSD4_CLIENT_CB_RECALL_ANY, &clp->cl_flags)) + continue; + if (ktime_get_boottime_seconds() - clp->cl_ra_time < 5) + continue; + if (clp->cl_cb_state != NFSD4_CB_UP) continue; - } list_add(&clp->cl_ra_cblist, &cblist); /* release in nfsd4_cb_recall_any_release */