From patchwork Mon Sep 18 09:11:51 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 9956071 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D56BC601E9 for ; Mon, 18 Sep 2017 09:31:04 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C2F8524B48 for ; Mon, 18 Sep 2017 09:31:04 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B7DEF28C0A; Mon, 18 Sep 2017 09:31:04 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4512724B48 for ; Mon, 18 Sep 2017 09:31:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932584AbdIRJat (ORCPT ); Mon, 18 Sep 2017 05:30:49 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:56370 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932390AbdIRJQB (ORCPT ); Mon, 18 Sep 2017 05:16:01 -0400 Received: from localhost (LFbn-1-12253-150.w90-92.abo.wanadoo.fr [90.92.67.150]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 2EB72B01; Mon, 18 Sep 2017 09:16:00 +0000 (UTC) From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , linux-xfs@vger.kernel.org, "Darrick J. Wong" , Brian Foster Subject: [PATCH 4.9 42/78] xfs: set firstfsb to NULLFSBLOCK before feeding it to _bmapi_write Date: Mon, 18 Sep 2017 11:11:51 +0200 Message-Id: <20170918091132.707444469@linuxfoundation.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170918091126.077483037@linuxfoundation.org> References: <20170918091126.077483037@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Sender: linux-xfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-xfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Darrick J. Wong" commit 4c1a67bd3606540b9b42caff34a1d5cd94b1cf65 upstream. We must initialize the firstfsb parameter to _bmapi_write so that it doesn't incorrectly treat stack garbage as a restriction on which AGs it can search for free space. Fixes-coverity-id: 1402025 Fixes-coverity-id: 1415167 Signed-off-by: Darrick J. Wong Reviewed-by: Brian Foster Signed-off-by: Greg Kroah-Hartman --- fs/xfs/libxfs/xfs_bmap.c | 9 +++++++++ fs/xfs/xfs_reflink.c | 2 +- 2 files changed, 10 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html --- a/fs/xfs/libxfs/xfs_bmap.c +++ b/fs/xfs/libxfs/xfs_bmap.c @@ -6639,6 +6639,15 @@ xfs_bmap_finish_one( bmap.br_blockcount = *blockcount; bmap.br_state = state; + /* + * firstfsb is tied to the transaction lifetime and is used to + * ensure correct AG locking order and schedule work item + * continuations. XFS_BUI_MAX_FAST_EXTENTS (== 1) restricts us + * to only making one bmap call per transaction, so it should + * be safe to have it as a local variable here. + */ + firstfsb = NULLFSBLOCK; + trace_xfs_bmap_deferred(tp->t_mountp, XFS_FSB_TO_AGNO(tp->t_mountp, startblock), type, XFS_FSB_TO_AGBNO(tp->t_mountp, startblock), --- a/fs/xfs/xfs_reflink.c +++ b/fs/xfs/xfs_reflink.c @@ -333,7 +333,7 @@ xfs_reflink_convert_cow_extent( struct xfs_defer_ops *dfops) { struct xfs_bmbt_irec irec = *imap; - xfs_fsblock_t first_block; + xfs_fsblock_t first_block = NULLFSBLOCK; int nimaps = 1; if (imap->br_state == XFS_EXT_NORM)