From patchwork Fri Jun 19 14:33:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 223826 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,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 A1531C433DF for ; Fri, 19 Jun 2020 16:17:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 74FF0217D8 for ; Fri, 19 Jun 2020 16:17:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592583425; bh=ZHm2e9kSWCE/+gbErOovveJIiw92+SIMeDzUp+xvYz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=GIQy/E2P0ay6sywxJKI1mCsXjiQlJNs3/hfMD4bkTAm0ezi2/Z2FtEcbKkIYXnKgX v7HdX8TOVFdvjocTeoAyfFbfuw9TtLf/k8Vx/is654B+zAEvtm0Zvjrpjp69xiKl8F t5q0b2NaDNqB4oLqkT8FoI/GIuXZn/LtFTlr67zo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390843AbgFSQQ4 (ORCPT ); Fri, 19 Jun 2020 12:16:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:59682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390906AbgFSPCz (ORCPT ); Fri, 19 Jun 2020 11:02:55 -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 C79BD206DB; Fri, 19 Jun 2020 15:02:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592578975; bh=ZHm2e9kSWCE/+gbErOovveJIiw92+SIMeDzUp+xvYz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e2BcyR7u7zaaMrsnasLQSNZSuUhUnLjuxsokrnZw50Iebpyv/DA/vnQ4WyB33w1Q5 osETVg9xu9BB/O/Cv9cveGvcnHaoENHBNXOPgc5cLMVfzvljcpYnJSdKWW47fJs2K8 /u8oQLD9/xyTWTqTifryxMGrGQMeQMleF1nHVayA= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Filipe Manana , David Sterba , Sasha Levin Subject: [PATCH 4.19 229/267] btrfs: fix wrong file range cleanup after an error filling dealloc range Date: Fri, 19 Jun 2020 16:33:34 +0200 Message-Id: <20200619141659.700007592@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200619141648.840376470@linuxfoundation.org> References: <20200619141648.840376470@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Filipe Manana [ Upstream commit e2c8e92d1140754073ad3799eb6620c76bab2078 ] If an error happens while running dellaloc in COW mode for a range, we can end up calling extent_clear_unlock_delalloc() for a range that goes beyond our range's end offset by 1 byte, which affects 1 extra page. This results in clearing bits and doing page operations (such as a page unlock) outside our target range. Fix that by calling extent_clear_unlock_delalloc() with an inclusive end offset, instead of an exclusive end offset, at cow_file_range(). Fixes: a315e68f6e8b30 ("Btrfs: fix invalid attempt to free reserved space on failure to cow range") CC: stable@vger.kernel.org # 4.14+ Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Sasha Levin --- fs/btrfs/inode.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index b4f295a058d8..887f9ebc2bc2 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1136,8 +1136,8 @@ static noinline int cow_file_range(struct inode *inode, */ if (extent_reserved) { extent_clear_unlock_delalloc(inode, start, - start + cur_alloc_size, - start + cur_alloc_size, + start + cur_alloc_size - 1, + start + cur_alloc_size - 1, locked_page, clear_bits, page_ops);