From patchwork Thu Sep 16 16:01:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 513648 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=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 620B2C433FE for ; Thu, 16 Sep 2021 17:36:53 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4B9F760F93 for ; Thu, 16 Sep 2021 17:36:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343857AbhIPRiI (ORCPT ); Thu, 16 Sep 2021 13:38:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:53756 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344612AbhIPRf5 (ORCPT ); Thu, 16 Sep 2021 13:35:57 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 92D3363232; Thu, 16 Sep 2021 16:49:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1631810946; bh=aaidjrucUKnmG5VQ3F5mQ4dXhXB0XltpnQ3cCWjebso=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=WvKLGDaNlS3A57gt9rtIehhDFjSjVMyCgbgknjPm1omaSshgDctkr/+Tk4imUGOGQ VwClkwoaDwho0NOeXOv4aAPX875oFzbViK9ZatRqRA2g3b86CPYkrLL9HmDmRSEsX0 dzt1xGRFo/qEubA497ZOLiVRv8SeAg03AfbZ9spk= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Bob Peterson , Sasha Levin Subject: [PATCH 5.14 326/432] gfs2: Dont call dlm after protocol is unmounted Date: Thu, 16 Sep 2021 18:01:15 +0200 Message-Id: <20210916155821.892028212@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210916155810.813340753@linuxfoundation.org> References: <20210916155810.813340753@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Bob Peterson [ Upstream commit d1340f80f0b8066321b499a376780da00560e857 ] In the gfs2 withdraw sequence, the dlm protocol is unmounted with a call to lm_unmount. After a withdraw, users are allowed to unmount the withdrawn file system. But at that point we may still have glocks left over that we need to free via unmount's call to gfs2_gl_hash_clear. These glocks may have never been completed because of whatever problem caused the withdraw (IO errors or whatever). Before this patch, function gdlm_put_lock would still try to call into dlm to unlock these leftover glocks, which resulted in dlm returning -EINVAL because the lock space was abandoned. These glocks were never freed because there was no mechanism after that to free them. This patch adds a check to gdlm_put_lock to see if the locking protocol was inactive (DFL_UNMOUNT flag) and if so, free the glock and not make the invalid call into dlm. I could have combined this "if" with the one that follows, related to leftover glock LVBs, but I felt the code was more readable with its own if clause. Signed-off-by: Bob Peterson Signed-off-by: Sasha Levin --- fs/gfs2/lock_dlm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c index dac040162ecc..50578f881e6d 100644 --- a/fs/gfs2/lock_dlm.c +++ b/fs/gfs2/lock_dlm.c @@ -299,6 +299,11 @@ static void gdlm_put_lock(struct gfs2_glock *gl) gfs2_sbstats_inc(gl, GFS2_LKS_DCOUNT); gfs2_update_request_times(gl); + /* don't want to call dlm if we've unmounted the lock protocol */ + if (test_bit(DFL_UNMOUNT, &ls->ls_recover_flags)) { + gfs2_glock_free(gl); + return; + } /* don't want to skip dlm_unlock writing the lvb when lock has one */ if (test_bit(SDF_SKIP_DLM_UNLOCK, &sdp->sd_flags) &&