From patchwork Mon Jun 24 06:41:29 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Yan, Zheng" X-Patchwork-Id: 2768821 Return-Path: X-Original-To: patchwork-ceph-devel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 3304BC0AB1 for ; Mon, 24 Jun 2013 06:41:54 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id C6EF620117 for ; Mon, 24 Jun 2013 06:41:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39B412010F for ; Mon, 24 Jun 2013 06:41:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752499Ab3FXGlu (ORCPT ); Mon, 24 Jun 2013 02:41:50 -0400 Received: from mga09.intel.com ([134.134.136.24]:55048 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752470Ab3FXGls (ORCPT ); Mon, 24 Jun 2013 02:41:48 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga102.jf.intel.com with ESMTP; 23 Jun 2013 23:39:27 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.87,926,1363158000"; d="scan'208";a="358499636" Received: from zyan5-mobl.sh.intel.com ([10.239.13.16]) by orsmga002.jf.intel.com with ESMTP; 23 Jun 2013 23:41:34 -0700 From: "Yan, Zheng" To: ceph-devel@vger.kernel.org Cc: sage@inktank.com, alex.elder@linaro.org, "Yan, Zheng" Subject: [PATCH 3/3] mds: fix race between cap issue and revoke Date: Mon, 24 Jun 2013 14:41:29 +0800 Message-Id: <1372056089-11603-3-git-send-email-zheng.z.yan@intel.com> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1372056089-11603-1-git-send-email-zheng.z.yan@intel.com> References: <1372056089-11603-1-git-send-email-zheng.z.yan@intel.com> Sender: ceph-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org X-Spam-Status: No, score=-8.0 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: "Yan, Zheng" If we receive new caps from the auth MDS and the non-auth MDS is revoking the newly issued caps, we should release the caps from the non-auth MDS. The scenario is filelock's state changes from SYNC to LOCK. Non-auth MDS revokes Fc cap, the client gets Fc cap from the auth MDS at the same time. Signed-off-by: Yan, Zheng --- fs/ceph/caps.c | 29 ++++++++++++++++++++--------- 1 file changed, 20 insertions(+), 9 deletions(-) diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index a8c616b..9b8b1aa 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -813,22 +813,28 @@ int __ceph_caps_issued_mask(struct ceph_inode_info *ci, int mask, int touch) /* * Return true if mask caps are currently being revoked by an MDS. */ -int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) +int __ceph_caps_revoking_other(struct ceph_inode_info *ci, + struct ceph_cap *ocap, int mask) { - struct inode *inode = &ci->vfs_inode; struct ceph_cap *cap; struct rb_node *p; - int ret = 0; - spin_lock(&ci->i_ceph_lock); for (p = rb_first(&ci->i_caps); p; p = rb_next(p)) { cap = rb_entry(p, struct ceph_cap, ci_node); - if (__cap_is_valid(cap) && - (cap->implemented & ~cap->issued & mask)) { - ret = 1; - break; - } + if (cap != ocap && __cap_is_valid(cap) && + (cap->implemented & ~cap->issued & mask)) + return 1; } + return 0; +} + +int ceph_caps_revoking(struct ceph_inode_info *ci, int mask) +{ + struct inode *inode = &ci->vfs_inode; + int ret; + + spin_lock(&ci->i_ceph_lock); + ret = __ceph_caps_revoking_other(ci, NULL, mask); spin_unlock(&ci->i_ceph_lock); dout("ceph_caps_revoking %p %s = %d\n", inode, ceph_cap_string(mask), ret); @@ -2491,6 +2497,11 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant, } else { dout("grant: %s -> %s\n", ceph_cap_string(cap->issued), ceph_cap_string(newcaps)); + /* non-auth MDS is revoking the newly grant caps ? */ + if (cap == ci->i_auth_cap && + __ceph_caps_revoking_other(ci, cap, newcaps)) + check_caps = 2; + cap->issued = newcaps; cap->implemented |= newcaps; /* add bits only, to * avoid stepping on a