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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS 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 5D24BC43441 for ; Sun, 11 Nov 2018 20:34:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2341820818 for ; Sun, 11 Nov 2018 20:34:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2341820818 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=decadent.org.uk 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 S1730900AbeKLGYW (ORCPT ); Mon, 12 Nov 2018 01:24:22 -0500 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:49922 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730200AbeKLFsN (ORCPT ); Mon, 12 Nov 2018 00:48:13 -0500 Received: from [192.168.4.242] (helo=deadeye) by shadbolt.decadent.org.uk with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1gLvsZ-0000lK-7w; Sun, 11 Nov 2018 19:58:43 +0000 Received: from ben by deadeye with local (Exim 4.91) (envelope-from ) id 1gLvsW-0001iU-5J; Sun, 11 Nov 2018 19:58:40 +0000 Content-Type: text/plain; charset="UTF-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit MIME-Version: 1.0 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org CC: akpm@linux-foundation.org, "Theodore Ts'o" Date: Sun, 11 Nov 2018 19:49:05 +0000 Message-ID: X-Mailer: LinuxStableQueue (scripts by bwh) Subject: [PATCH 3.16 244/366] ext4: fix inline data updates with checksums enabled In-Reply-To: X-SA-Exim-Connect-IP: 192.168.4.242 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.16.61-rc1 review patch. If anyone has any objections, please let me know. ------------------ From: Theodore Ts'o commit 362eca70b53389bddf3143fe20f53dcce2cfdf61 upstream. The inline data code was updating the raw inode directly; this is problematic since if metadata checksums are enabled, ext4_mark_inode_dirty() must be called to update the inode's checksum. In addition, the jbd2 layer requires that get_write_access() be called before the metadata buffer is modified. Fix both of these problems. https://bugzilla.kernel.org/show_bug.cgi?id=200443 Signed-off-by: Theodore Ts'o Signed-off-by: Ben Hutchings --- fs/ext4/inline.c | 19 +++++++++++-------- fs/ext4/inode.c | 16 +++++++--------- 2 files changed, 18 insertions(+), 17 deletions(-) --- a/fs/ext4/inline.c +++ b/fs/ext4/inline.c @@ -681,6 +681,10 @@ int ext4_try_to_write_inline_data(struct goto convert; } + ret = ext4_journal_get_write_access(handle, iloc.bh); + if (ret) + goto out; + flags |= AOP_FLAG_NOFS; page = grab_cache_page_write_begin(mapping, 0, flags); @@ -709,7 +713,7 @@ int ext4_try_to_write_inline_data(struct out_up_read: up_read(&EXT4_I(inode)->xattr_sem); out: - if (handle) + if (handle && (ret != 1)) ext4_journal_stop(handle); brelse(iloc.bh); return ret; @@ -751,6 +755,7 @@ int ext4_write_inline_data_end(struct in ext4_write_unlock_xattr(inode, &no_expand); brelse(iloc.bh); + mark_inode_dirty(inode); out: return copied; } @@ -911,6 +916,9 @@ retry_journal: if (ret < 0) goto out_release_page; } + ret = ext4_journal_get_write_access(handle, iloc.bh); + if (ret) + goto out_release_page; up_read(&EXT4_I(inode)->xattr_sem); *pagep = page; @@ -931,7 +939,6 @@ int ext4_da_write_inline_data_end(struct unsigned len, unsigned copied, struct page *page) { - int i_size_changed = 0; int ret; ret = ext4_write_inline_data_end(inode, pos, len, copied, page); @@ -949,10 +956,8 @@ int ext4_da_write_inline_data_end(struct * But it's important to update i_size while still holding page lock: * page writeout could otherwise come in and zero beyond i_size. */ - if (pos+copied > inode->i_size) { + if (pos+copied > inode->i_size) i_size_write(inode, pos+copied); - i_size_changed = 1; - } unlock_page(page); page_cache_release(page); @@ -962,8 +967,7 @@ int ext4_da_write_inline_data_end(struct * ordering of page lock and transaction start for journaling * filesystems. */ - if (i_size_changed) - mark_inode_dirty(inode); + mark_inode_dirty(inode); return copied; } --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1113,9 +1113,10 @@ static int ext4_write_end(struct file *f struct inode *inode = mapping->host; int ret = 0, ret2; int i_size_changed = 0; + int inline_data = ext4_has_inline_data(inode); trace_ext4_write_end(inode, pos, len, copied); - if (ext4_has_inline_data(inode)) { + if (inline_data) { ret = ext4_write_inline_data_end(inode, pos, len, copied, page); if (ret < 0) { @@ -1141,7 +1142,7 @@ static int ext4_write_end(struct file *f * ordering of page lock and transaction start for journaling * filesystems. */ - if (i_size_changed) + if (i_size_changed || inline_data) ext4_mark_inode_dirty(handle, inode); if (pos + len > inode->i_size && ext4_can_truncate(inode)) @@ -1214,6 +1215,7 @@ static int ext4_journalled_write_end(str int partial = 0; unsigned from, to; int size_changed = 0; + int inline_data = ext4_has_inline_data(inode); trace_ext4_journalled_write_end(inode, pos, len, copied); from = pos & (PAGE_CACHE_SIZE - 1); @@ -1221,7 +1223,7 @@ static int ext4_journalled_write_end(str BUG_ON(!ext4_handle_valid(handle)); - if (ext4_has_inline_data(inode)) { + if (inline_data) { ret = ext4_write_inline_data_end(inode, pos, len, copied, page); if (ret < 0) { @@ -1249,7 +1251,7 @@ static int ext4_journalled_write_end(str unlock_page(page); page_cache_release(page); - if (size_changed) { + if (size_changed || inline_data) { ret2 = ext4_mark_inode_dirty(handle, inode); if (!ret) ret = ret2; @@ -1856,11 +1858,7 @@ static int __ext4_journalled_writepage(s } if (inline_data) { - BUFFER_TRACE(inode_bh, "get write access"); - ret = ext4_journal_get_write_access(handle, inode_bh); - - err = ext4_handle_dirty_metadata(handle, inode, inode_bh); - + ret = ext4_mark_inode_dirty(handle, inode); } else { ret = ext4_walk_page_buffers(handle, page_bufs, 0, len, NULL, do_journal_get_write_access);