diff options
| author | Liu Bo <bo.li.liu@oracle.com> | 2016-06-22 18:31:27 -0700 |
|---|---|---|
| committer | David Sterba <dsterba@suse.com> | 2016-07-26 13:52:25 +0200 |
| commit | 6fb37b756acce6d6e045f79c3764206033f617b4 (patch) | |
| tree | 0279142b07c97a236b5dc5eea48db7bc10c80179 /fs | |
| parent | c1fd5c30d1328e0a0c3aafc3768b9cea94d7b28f (diff) | |
| download | linux-6fb37b756acce6d6e045f79c3764206033f617b4.tar.bz2 | |
Btrfs: check inconsistence between chunk and block group
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 <bo.li.liu@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/btrfs/extent-tree.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 9fcb8c97083b..cab2f9c8d321 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -9887,7 +9887,22 @@ 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]++; |