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 0699115C8A for ; Mon, 5 Dec 2022 19:43:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7884FC433C1; Mon, 5 Dec 2022 19:43:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670269389; bh=bRqdeSdg0UopUKDXfEBckA2rb76aku/3pYWAqfRWkNs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VyaRaq21MLYS07U8qHRbepTfW2UqKomooab2AmJ3PVz3LK75Y2nVz9WSxdljkhUkC dUEfPsq+nM17YiEFcsw7n8KtOnJ3P0gDhm+IrzOJSq4UaXL1da2JfF/LMbvwJnAbS/ zRNBbLMRAowgtJdqFNkxKBetLb6YdnyQJ1nZQnDE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, David Howells , Marc Dionne , linux-afs@lists.infradead.org, Linus Torvalds , Sasha Levin Subject: [PATCH 5.4 109/153] afs: Fix fileserver probe RTT handling Date: Mon, 5 Dec 2022 20:10:33 +0100 Message-Id: <20221205190811.869569102@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190808.733996403@linuxfoundation.org> References: <20221205190808.733996403@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: David Howells [ Upstream commit ca57f02295f188d6c65ec02202402979880fa6d8 ] The fileserver probing code attempts to work out the best fileserver to use for a volume by retrieving the RTT calculated by AF_RXRPC for the probe call sent to each server and comparing them. Sometimes, however, no RTT estimate is available and rxrpc_kernel_get_srtt() returns false, leading good fileservers to be given an RTT of UINT_MAX and thus causing the rotation algorithm to ignore them. Fix afs_select_fileserver() to ignore rxrpc_kernel_get_srtt()'s return value and just take the estimated RTT it provides - which will be capped at 1 second. Fixes: 1d4adfaf6574 ("rxrpc: Make rxrpc_kernel_get_srtt() indicate validity") Signed-off-by: David Howells Reviewed-by: Marc Dionne Tested-by: Marc Dionne cc: linux-afs@lists.infradead.org Link: https://lore.kernel.org/r/166965503999.3392585.13954054113218099395.stgit@warthog.procyon.org.uk/ Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin --- fs/afs/fs_probe.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/afs/fs_probe.c b/fs/afs/fs_probe.c index 51ee3dd79700..e9282e025912 100644 --- a/fs/afs/fs_probe.c +++ b/fs/afs/fs_probe.c @@ -92,8 +92,8 @@ void afs_fileserver_probe_result(struct afs_call *call) } } - if (rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us) && - rtt_us < server->probe.rtt) { + rxrpc_kernel_get_srtt(call->net->socket, call->rxcall, &rtt_us); + if (rtt_us < server->probe.rtt) { server->probe.rtt = rtt_us; alist->preferred = index; have_result = true; -- 2.35.1