From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757933AbaIOWRG (ORCPT ); Mon, 15 Sep 2014 18:17:06 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:50993 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754881AbaIOWRD (ORCPT ); Mon, 15 Sep 2014 18:17:03 -0400 From: Kamal Mostafa To: linux-kernel@vger.kernel.org, stable@vger.kernel.org, kernel-team@lists.ubuntu.com Cc: Jan Kara , "Theodore Ts'o" , Kamal Mostafa Subject: [PATCH 3.13 076/187] ext4: Fix block zeroing when punching holes in indirect block files Date: Mon, 15 Sep 2014 15:08:06 -0700 Message-Id: <1410818997-9432-77-git-send-email-kamal@canonical.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1410818997-9432-1-git-send-email-kamal@canonical.com> References: <1410818997-9432-1-git-send-email-kamal@canonical.com> X-Extended-Stable: 3.13 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.13.11.7 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Jan Kara commit 77ea2a4ba657a1ad4fb7c64bc5cdce84b8a132b6 upstream. free_holes_block() passed local variable as a block pointer to ext4_clear_blocks(). Thus ext4_clear_blocks() zeroed out this local variable instead of proper place in inode / indirect block. We later zero out proper place in inode / indirect block but don't dirty the inode / buffer again which can lead to subtle issues (some changes e.g. to inode can be lost). Signed-off-by: Jan Kara Signed-off-by: Theodore Ts'o Signed-off-by: Kamal Mostafa --- fs/ext4/indirect.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/indirect.c b/fs/ext4/indirect.c index e6574d7..c30cbe2 100644 --- a/fs/ext4/indirect.c +++ b/fs/ext4/indirect.c @@ -1345,8 +1345,8 @@ static int free_hole_blocks(handle_t *handle, struct inode *inode, if (level == 0 || (bh && all_zeroes((__le32 *)bh->b_data, (__le32 *)bh->b_data + addr_per_block))) { - ext4_free_data(handle, inode, parent_bh, &blk, &blk+1); - *i_data = 0; + ext4_free_data(handle, inode, parent_bh, + i_data, i_data + 1); } brelse(bh); bh = NULL; -- 1.9.1