From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from userp1040.oracle.com ([156.151.31.81]:51833 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751935AbcFWB2X (ORCPT ); Wed, 22 Jun 2016 21:28:23 -0400 Received: from userv0021.oracle.com (userv0021.oracle.com [156.151.31.71]) by userp1040.oracle.com (Sentrion-MTA-4.3.2/Sentrion-MTA-4.3.2) with ESMTP id u5N1SMgl012462 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 23 Jun 2016 01:28:23 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userv0021.oracle.com (8.13.8/8.13.8) with ESMTP id u5N1SMAQ024279 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=OK) for ; Thu, 23 Jun 2016 01:28:22 GMT Received: from abhmp0012.oracle.com (abhmp0012.oracle.com [141.146.116.18]) by userv0121.oracle.com (8.13.8/8.13.8) with ESMTP id u5N1SKhV007033 for ; Thu, 23 Jun 2016 01:28:22 GMT From: Liu Bo To: linux-btrfs@vger.kernel.org Subject: [PATCH] Btrfs: check inconsistence between chunk and block group Date: Wed, 22 Jun 2016 18:31:27 -0700 Message-Id: <1466645487-26678-1-git-send-email-bo.li.liu@oracle.com> Sender: linux-btrfs-owner@vger.kernel.org List-ID: With btrfs-corrupt-block, one can drop one chunk item and mounting will end up with a panic in btrfs_full_stripe_len(). This doesn't not remove the BUG_ON, but instead checks it a bit earlier when we find the block group item. Signed-off-by: Liu Bo --- fs/btrfs/extent-tree.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 689d25a..d860291 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9662,7 +9662,22 @@ static int find_first_block_group(struct btrfs_root *root, if (found_key.objectid >= key->objectid && found_key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) { - ret = 0; + struct extent_map_tree *em_tree; + struct extent_map *em; + + em_tree = &root->fs_info->mapping_tree.map_tree; + read_lock(&em_tree->lock); + em = lookup_extent_mapping(em_tree, found_key.objectid, + found_key.offset); + read_unlock(&em_tree->lock); + if (!em) { + btrfs_err(root->fs_info, + "logical %llu len %llu found bg but no related chunk", + found_key.objectid, found_key.offset); + ret = -ENOENT; + } else { + ret = 0; + } goto out; } path->slots[0]++; -- 2.5.5