From patchwork Mon Oct 27 12:52:21 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Sterba X-Patchwork-Id: 5160651 Return-Path: X-Original-To: patchwork-linux-btrfs@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 2F1B09F318 for ; Mon, 27 Oct 2014 12:52:31 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 4F8B62012D for ; Mon, 27 Oct 2014 12:52:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C17920127 for ; Mon, 27 Oct 2014 12:52:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752039AbaJ0MwZ (ORCPT ); Mon, 27 Oct 2014 08:52:25 -0400 Received: from cantor2.suse.de ([195.135.220.15]:51652 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751573AbaJ0MwY (ORCPT ); Mon, 27 Oct 2014 08:52:24 -0400 Received: from relay1.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id BAC5EAC8D for ; Mon, 27 Oct 2014 12:52:22 +0000 (UTC) Received: by ds.suse.cz (Postfix, from userid 10065) id 8A816DA93A; Mon, 27 Oct 2014 13:52:22 +0100 (CET) From: David Sterba To: linux-btrfs@vger.kernel.org Cc: David Sterba Subject: [PATCH] btrfs: use macro accessors in superblock validation checks Date: Mon, 27 Oct 2014 13:52:21 +0100 Message-Id: <1414414341-26472-1-git-send-email-dsterba@suse.cz> X-Mailer: git-send-email 2.1.1 Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Spam-Status: No, score=-7.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The initial patch c926093ec516f5d316 (btrfs: add more superblock checks) did not properly use the macro accessors that wrap endianness and the code would not work correctly on big endian machines. Reported-by: Qu Wenruo Signed-off-by: David Sterba --- fs/btrfs/disk-io.c | 43 ++++++++++++++++++++++--------------------- 1 file changed, 22 insertions(+), 21 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 1ad0f47ac850..1bf9f897065d 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -3817,19 +3817,19 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, struct btrfs_super_block *sb = fs_info->super_copy; int ret = 0; - if (sb->root_level > BTRFS_MAX_LEVEL) { - printk(KERN_ERR "BTRFS: tree_root level too big: %d > %d\n", - sb->root_level, BTRFS_MAX_LEVEL); + if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) { + printk(KERN_ERR "BTRFS: tree_root level too big: %d >= %d\n", + btrfs_super_root_level(sb), BTRFS_MAX_LEVEL); ret = -EINVAL; } - if (sb->chunk_root_level > BTRFS_MAX_LEVEL) { - printk(KERN_ERR "BTRFS: chunk_root level too big: %d > %d\n", - sb->chunk_root_level, BTRFS_MAX_LEVEL); + if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) { + printk(KERN_ERR "BTRFS: chunk_root level too big: %d >= %d\n", + btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL); ret = -EINVAL; } - if (sb->log_root_level > BTRFS_MAX_LEVEL) { - printk(KERN_ERR "BTRFS: log_root level too big: %d > %d\n", - sb->log_root_level, BTRFS_MAX_LEVEL); + if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) { + printk(KERN_ERR "BTRFS: log_root level too big: %d >= %d\n", + btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL); ret = -EINVAL; } @@ -3837,15 +3837,15 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, * The common minimum, we don't know if we can trust the nodesize/sectorsize * items yet, they'll be verified later. Issue just a warning. */ - if (!IS_ALIGNED(sb->root, 4096)) + if (!IS_ALIGNED(btrfs_super_root(sb), 4096)) printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n", sb->root); - if (!IS_ALIGNED(sb->chunk_root, 4096)) + if (!IS_ALIGNED(btrfs_super_chunk_root(sb), 4096)) printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n", sb->chunk_root); - if (!IS_ALIGNED(sb->log_root, 4096)) + if (!IS_ALIGNED(btrfs_super_log_root(sb), 4096)) printk(KERN_WARNING "BTRFS: tree_root block unaligned: %llu\n", - sb->log_root); + btrfs_super_log_root(sb)); if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) { printk(KERN_ERR "BTRFS: dev_item UUID does not match fsid: %pU != %pU\n", @@ -3857,13 +3857,13 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, * Hint to catch really bogus numbers, bitflips or so, more exact checks are * done later */ - if (sb->num_devices > (1UL << 31)) + if (btrfs_super_num_devices(sb) > (1UL << 31)) printk(KERN_WARNING "BTRFS: suspicious number of devices: %llu\n", - sb->num_devices); + btrfs_super_num_devices(sb)); - if (sb->bytenr != BTRFS_SUPER_INFO_OFFSET) { + if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) { printk(KERN_ERR "BTRFS: super offset mismatch %llu != %u\n", - sb->bytenr, BTRFS_SUPER_INFO_OFFSET); + btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET); ret = -EINVAL; } @@ -3871,14 +3871,15 @@ static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, * The generation is a global counter, we'll trust it more than the others * but it's still possible that it's the one that's wrong. */ - if (sb->generation < sb->chunk_root_generation) + if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb)) printk(KERN_WARNING "BTRFS: suspicious: generation < chunk_root_generation: %llu < %llu\n", - sb->generation, sb->chunk_root_generation); - if (sb->generation < sb->cache_generation && sb->cache_generation != (u64)-1) + btrfs_super_generation(sb), btrfs_super_chunk_root_generation(sb)); + if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb) + && btrfs_super_cache_generation(sb) != (u64)-1) printk(KERN_WARNING "BTRFS: suspicious: generation < cache_generation: %llu < %llu\n", - sb->generation, sb->cache_generation); + btrfs_super_generation(sb), btrfs_super_cache_generation(sb)); return ret; }