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 6AC0C269AFB; Tue, 8 Apr 2025 11:50:01 +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=1744113001; cv=none; b=IkxAmBgNAWbTDuYJZ3J7y4U7AUApdTuRSbAUPgVbLxjpvSvBqV27AI9xEoqaBb8We38EghBhXKWlttRG+oRZG/yo1XskahUc4kn/KFfvyG0pf432y/Gy73gcnpQrBh0yc1XM7o/Qr6QCbU/auey/MAhyoqiRMl7usCiIjoWDfoU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744113001; c=relaxed/simple; bh=XHAHqxrmqJAFmyVB4ZTl6MSZXXq5uDWA10aff8tLk5k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=iXgvStJhoQa1yObjGyqe2/PnodugFCeERUkd8xyN1itQ1JWH7caoj1koOl7AsZgrAeaTqbV++kYDCDRqqCZGehB0pBnzc+N/64mhXlgy4nDbJWm+Xkjxq2HRhe0KkwCZXTok70LHC+HitDWIgeuYUM3JlzFIQe/UufMlzS/ZcKo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=xGIsSiEr; 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="xGIsSiEr" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EA6E5C4CEE7; Tue, 8 Apr 2025 11:50:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744113001; bh=XHAHqxrmqJAFmyVB4ZTl6MSZXXq5uDWA10aff8tLk5k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xGIsSiErEE7EWXFeLxfNlaK1X+bVjThk5HFcC48XUGwFEVDIdixjNP4Q6BL83BxQ0 60SgrYWplKmcJWqybtHOJcRO9QPV0PkpxeZ3KKFTdMinEc5RbX21nw7PSK9QVeKX0u PQvVr/5qVn/101F+IdX6LFy49rs60N/6czsZy+cI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jeff Layton , Chuck Lever Subject: [PATCH 5.15 277/279] NFSD: Skip sending CB_RECALL_ANY when the backchannel isnt up Date: Tue, 8 Apr 2025 12:51:00 +0200 Message-ID: <20250408104833.869630154@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104826.319283234@linuxfoundation.org> References: <20250408104826.319283234@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 5.15-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 @@ -6250,14 +6250,19 @@ 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 */