From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A2C82C47253 for ; Fri, 1 May 2020 13:28:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7A61A208DB for ; Fri, 1 May 2020 13:28:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339695; bh=mCavN1At21tKbAF2JyVh9FEsLWtaFw/NGJH8wNFnySs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HPGMQE2eUKCUyCum37UDWfAaPhnf3kFBS+T9L2fH/HFtwuGS8SIG13tBX0IWIfr+7 BQ4cuBrx8ukQFHoBZMSiJaMi7zTJTodUc40WwEN8jgX9EUB+rrzWuEX2vQ9nz2xI9f SGvgTaIXSufQSlmvb/l/sqbl83buts4gRxDTMG+Y= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729593AbgEAN2O (ORCPT ); Fri, 1 May 2020 09:28:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:51040 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729560AbgEAN2M (ORCPT ); Fri, 1 May 2020 09:28:12 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8DB3F20757; Fri, 1 May 2020 13:28:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588339692; bh=mCavN1At21tKbAF2JyVh9FEsLWtaFw/NGJH8wNFnySs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=USBcwfTkfttY2J4N4jDdrAs4RDU54R/2Wk03Em3cSLTKGMxwxmyA3k554f+eJa96L s0rBwQHc5R5DPknnRAuWwefn//E64geHwxNjVntoM1j6ZNP+qdKt88g8oxtp8YRefp G8/plD2EmNxJxrMH0VLC6RrsmFtQf4xNT4yGdfrA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Yan, Zheng" , Jeff Layton , Ilya Dryomov , Sasha Levin Subject: [PATCH 4.9 10/80] ceph: dont skip updating wanted caps when cap is stale Date: Fri, 1 May 2020 15:21:04 +0200 Message-Id: <20200501131516.596113175@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200501131513.810761598@linuxfoundation.org> References: <20200501131513.810761598@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Yan, Zheng [ Upstream commit 0aa971b6fd3f92afef6afe24ef78d9bb14471519 ] 1. try_get_cap_refs() fails to get caps and finds that mds_wanted does not include what it wants. It returns -ESTALE. 2. ceph_get_caps() calls ceph_renew_caps(). ceph_renew_caps() finds that inode has cap, so it calls ceph_check_caps(). 3. ceph_check_caps() finds that issued caps (without checking if it's stale) already includes caps wanted by open file, so it skips updating wanted caps. Above events can cause an infinite loop inside ceph_get_caps(). Signed-off-by: "Yan, Zheng" Reviewed-by: Jeff Layton Signed-off-by: Ilya Dryomov Signed-off-by: Sasha Levin --- fs/ceph/caps.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index f5d9835264aa1..617e9ae67f506 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -1764,8 +1764,12 @@ retry_locked: } /* want more caps from mds? */ - if (want & ~(cap->mds_wanted | cap->issued)) - goto ack; + if (want & ~cap->mds_wanted) { + if (want & ~(cap->mds_wanted | cap->issued)) + goto ack; + if (!__cap_is_valid(cap)) + goto ack; + } /* things we might delay */ if ((cap->issued & ~retain) == 0 && -- 2.20.1