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=-7.7 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 5CB10C04EB9 for ; Thu, 6 Dec 2018 14:47:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 22DB8214DE for ; Thu, 6 Dec 2018 14:47:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544107639; bh=CLrj/deo3JVwPbu3+SJaODbAGj13X253vJY6pmx3Prg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TKK42DupKqk2rO4Gmdj6dBeM60T6KiW+yERPJHiYakqC9NZALKXd2XDEHLOa2tOWg F8G8AbHMoID786hKxOoiXEoaAtgkkJFLNghDeQ8wFYU15jE0jh6SAmacG2TCEbk2TF c4qERcxwcXcjsVAnDm+9x9QSdtM2RH3DCsZ49F6k= DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 22DB8214DE Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linuxfoundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731398AbeLFOrR (ORCPT ); Thu, 6 Dec 2018 09:47:17 -0500 Received: from mail.kernel.org ([198.145.29.99]:52048 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731380AbeLFOrM (ORCPT ); Thu, 6 Dec 2018 09:47:12 -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 60EA720661; Thu, 6 Dec 2018 14:47:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1544107631; bh=CLrj/deo3JVwPbu3+SJaODbAGj13X253vJY6pmx3Prg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lMRGZm2oCC8Hi/FYGd86YI9WTKFtdzBwTcJ4LhC9K5d++Y3PQew6lGy7149EC0q9m Vpk9Zqdiaa/LR8bZm+Kp7jxCaT3wAXI98HzKWWx3uJ4gj/HG2yYW68qq25DjRH0euU Btq92rh0y4f8ajmgsCg6d/uvFY2k1mvyEQK/Ks/s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Pavel Tikhomirov , Vasily Averin , Andrey Ryabinin , Jan Kara , Johannes Weiner , Mel Gorman , Matthew Wilcox , Andi Kleen , Andrew Morton , Linus Torvalds Subject: [PATCH 4.9 044/101] mm: cleancache: fix corruption on missed inode invalidation Date: Thu, 6 Dec 2018 15:38:43 +0100 Message-Id: <20181206143014.057240257@linuxfoundation.org> X-Mailer: git-send-email 2.19.2 In-Reply-To: <20181206143011.174892052@linuxfoundation.org> References: <20181206143011.174892052@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 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pavel Tikhomirov commit 6ff38bd40230af35e446239396e5fc8ebd6a5248 upstream. If all pages are deleted from the mapping by memory reclaim and also moved to the cleancache: __delete_from_page_cache (no shadow case) unaccount_page_cache_page cleancache_put_page page_cache_delete mapping->nrpages -= nr (nrpages becomes 0) We don't clean the cleancache for an inode after final file truncation (removal). truncate_inode_pages_final check (nrpages || nrexceptional) is false no truncate_inode_pages no cleancache_invalidate_inode(mapping) These way when reading the new file created with same inode we may get these trash leftover pages from cleancache and see wrong data instead of the contents of the new file. Fix it by always doing truncate_inode_pages which is already ready for nrpages == 0 && nrexceptional == 0 case and just invalidates inode. [akpm@linux-foundation.org: add comment, per Jan] Link: http://lkml.kernel.org/r/20181112095734.17979-1-ptikhomirov@virtuozzo.com Fixes: commit 91b0abe36a7b ("mm + fs: store shadow entries in page cache") Signed-off-by: Pavel Tikhomirov Reviewed-by: Vasily Averin Reviewed-by: Andrey Ryabinin Reviewed-by: Jan Kara Cc: Johannes Weiner Cc: Mel Gorman Cc: Matthew Wilcox Cc: Andi Kleen Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Vasily Averin Signed-off-by: Greg Kroah-Hartman --- mm/truncate.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/mm/truncate.c +++ b/mm/truncate.c @@ -443,9 +443,13 @@ void truncate_inode_pages_final(struct a */ spin_lock_irq(&mapping->tree_lock); spin_unlock_irq(&mapping->tree_lock); - - truncate_inode_pages(mapping, 0); } + + /* + * Cleancache needs notification even if there are no pages or shadow + * entries. + */ + truncate_inode_pages(mapping, 0); } EXPORT_SYMBOL(truncate_inode_pages_final);