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=-6.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,URIBL_BLOCKED,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 6CB69C282C4 for ; Mon, 4 Feb 2019 10:52:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 320A8217FA for ; Mon, 4 Feb 2019 10:52:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549277527; bh=IlOcmWRFrQeDT3T8sr+sxF8sAJKLN5dzbMQn6hHo+4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=RwBDqs0VyG+EXQT9xttGYDVj2VQs9KCc6yeYwggrm+E06myqdAXxzpp8iG8eaX/NR uuNa9yfYmYwR7auCDPNEvHLBlxvbIEIfKKUW9zBUTDC74UE/HK5swNi0ICVex2/pAN ORHH+6gAf4z7J836VKLxSHrR9mCv5901wRnESpqI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732524AbfBDKwF (ORCPT ); Mon, 4 Feb 2019 05:52:05 -0500 Received: from mail.kernel.org ([198.145.29.99]:49780 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732007AbfBDKwD (ORCPT ); Mon, 4 Feb 2019 05:52:03 -0500 Received: from localhost (5356596B.cm-6-7b.dynamic.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 176632070C; Mon, 4 Feb 2019 10:52:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1549277522; bh=IlOcmWRFrQeDT3T8sr+sxF8sAJKLN5dzbMQn6hHo+4g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Zf0DP0WXIDdnG6aZZItXnziBKKqXVPsiSiFYVXgbXc1c1sMYP2gMch4jtxkkciSl5 oO5flBYocBZHMiqTgrzRO7Ro4xdNqXxcLwCttwDMx/o6T+/yhmxDYl7FK17YmO5FEX c+E7pS0NrZUKF9SWMKJ1lbw0wDyYoi2ACOC0x5Xs= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, stable@kernel.org, Waiman Long , Dave Chinner , Linus Torvalds Subject: [PATCH 4.20 40/80] fs/dcache: Fix incorrect nr_dentry_unused accounting in shrink_dcache_sb() Date: Mon, 4 Feb 2019 11:37:00 +0100 Message-Id: <20190204103625.542141897@linuxfoundation.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190204103620.287366543@linuxfoundation.org> References: <20190204103620.287366543@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review X-Patchwork-Hint: ignore 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 4.20-stable review patch. If anyone has any objections, please let me know. ------------------ From: Waiman Long commit 1dbd449c9943e3145148cc893c2461b72ba6fef0 upstream. The nr_dentry_unused per-cpu counter tracks dentries in both the LRU lists and the shrink lists where the DCACHE_LRU_LIST bit is set. The shrink_dcache_sb() function moves dentries from the LRU list to a shrink list and subtracts the dentry count from nr_dentry_unused. This is incorrect as the nr_dentry_unused count will also be decremented in shrink_dentry_list() via d_shrink_del(). To fix this double decrement, the decrement in the shrink_dcache_sb() function is taken out. Fixes: 4e717f5c1083 ("list_lru: remove special case function list_lru_dispose_all." Cc: stable@kernel.org Signed-off-by: Waiman Long Reviewed-by: Dave Chinner Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/dcache.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1188,15 +1188,11 @@ static enum lru_status dentry_lru_isolat */ void shrink_dcache_sb(struct super_block *sb) { - long freed; - do { LIST_HEAD(dispose); - freed = list_lru_walk(&sb->s_dentry_lru, + list_lru_walk(&sb->s_dentry_lru, dentry_lru_isolate_shrink, &dispose, 1024); - - this_cpu_sub(nr_dentry_unused, freed); shrink_dentry_list(&dispose); } while (list_lru_count(&sb->s_dentry_lru) > 0); }