From patchwork Sat Aug 24 16:21:37 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 13776448 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 C843128DD1; Sat, 24 Aug 2024 16:21:44 +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=1724516504; cv=none; b=WR0zzqVro8Hjg1ipYwwIva5kW+2Z1UabFE0gDay+1Ck+ubwv5ehEA9JwF9H/Tg1HKndvNEzocY2sfworpEAXukBQZpIfWTde4JDi0T5Yt7fTrdvc5TaN1DpKvxTwHuoddzdsZACGXiz/PgvSgYgbwWjkacTK4XCwCr3MXk+0WMQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724516504; c=relaxed/simple; bh=u8uOJ2emCnTz93KJ2STsHVugtH3Gb9EimYkXEh2uibY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=RkMGu1i6iHuWG/JpnBNn8FN3S6xkvUmIANP4dlOv3ffQtcLSemE3NsBWYipKNjvxvu0IVKA5C6rnnX1daKgL8VCcO9iEpLCqpJOwfzw15XSZi/W4gPODVqckSz8mr5EzpKQ3mfjX8hmapV5+qB7z1ncJyE3+XmpyfhVZWe1/cCo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=B/oBkHc7; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="B/oBkHc7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C13F1C32781; Sat, 24 Aug 2024 16:21:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724516504; bh=u8uOJ2emCnTz93KJ2STsHVugtH3Gb9EimYkXEh2uibY=; h=From:To:Cc:Subject:Date:From; b=B/oBkHc7bYLuA5zbbDBy1fDmufmAWckVf7lRCb+KZXfrH/QLJjOatxYY6S82yPbIV YHPWGUrgzZ34lARnLOf13vPjJqLRYoXDtdhSO93j/E8GsJzy9wxkefSa7zNfW6I0Qp uYxMpplgEYN/LEKM7cClkpUzh/tIIojgblAuHHl0eoxpmlHoTY7NPXg4fJ7OsVQ8ce 24MG3gcU/GJdBtz1wkW2Lbqyaep/qzAFsy0orGxqZQOChThNkOdPV645VrLrZjfL4T I57610q18SFgG700iuPzhujT58HzTIMM3bg9dXVyr8tXfUMlxsXVKUFgweh2RRQQQk 2pLJ8OTSzoJdA== From: cel@kernel.org To: Cc: , lilingfeng3@huawei.com, NeilBrown , Jeff Layton Subject: [PATCH 6.6.y] NFSD: simplify error paths in nfsd_svc() Date: Sat, 24 Aug 2024 12:21:37 -0400 Message-ID: <20240824162137.2157-1-cel@kernel.org> X-Mailer: git-send-email 2.45.1 Precedence: bulk X-Mailing-List: linux-nfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: NeilBrown [ Upstream commit bf32075256e9dd9c6b736859e2c5813981339908 ] The error paths in nfsd_svc() are needlessly complex and can result in a final call to svc_put() without nfsd_last_thread() being called. This results in the listening sockets not being closed properly. The per-netns setup provided by nfsd_startup_new() and removed by nfsd_shutdown_net() is needed precisely when there are running threads. So we don't need nfsd_up_before. We don't need to know if it *was* up. We only need to know if any threads are left. If none are, then we must call nfsd_shutdown_net(). But we don't need to do that explicitly as nfsd_last_thread() does that for us. So simply call nfsd_last_thread() before the last svc_put() if there are no running threads. That will always do the right thing. Also discard: pr_info("nfsd: last server has exited, flushing export cache\n"); It may not be true if an attempt to start the first server failed, and it isn't particularly helpful and it simply reports normal behaviour. Signed-off-by: NeilBrown Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever --- fs/nfsd/nfssvc.c | 14 ++++---------- 1 file changed, 4 insertions(+), 10 deletions(-) Reported-by: Li Lingfeng Suggested-by: Li Lingfeng Tested-by: Li Lingfeng diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c index 7911c4b3b5d3..710a54c7dffc 100644 --- a/fs/nfsd/nfssvc.c +++ b/fs/nfsd/nfssvc.c @@ -567,7 +567,6 @@ void nfsd_last_thread(struct net *net) return; nfsd_shutdown_net(net); - pr_info("nfsd: last server has exited, flushing export cache\n"); nfsd_export_flush(net); } @@ -783,7 +782,6 @@ int nfsd_svc(int nrservs, struct net *net, const struct cred *cred) { int error; - bool nfsd_up_before; struct nfsd_net *nn = net_generic(net, nfsd_net_id); struct svc_serv *serv; @@ -803,8 +801,6 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred) error = nfsd_create_serv(net); if (error) goto out; - - nfsd_up_before = nn->nfsd_net_up; serv = nn->nfsd_serv; error = nfsd_startup_net(net, cred); @@ -812,17 +808,15 @@ nfsd_svc(int nrservs, struct net *net, const struct cred *cred) goto out_put; error = svc_set_num_threads(serv, NULL, nrservs); if (error) - goto out_shutdown; + goto out_put; error = serv->sv_nrthreads; - if (error == 0) - nfsd_last_thread(net); -out_shutdown: - if (error < 0 && !nfsd_up_before) - nfsd_shutdown_net(net); out_put: /* Threads now hold service active */ if (xchg(&nn->keep_active, 0)) svc_put(serv); + + if (serv->sv_nrthreads == 0) + nfsd_last_thread(net); svc_put(serv); out: mutex_unlock(&nfsd_mutex);