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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>
steinar/wifi_calib_4_9_kernel
Liu Bo 2016-06-22 18:31:27 -07:00 committed by David Sterba
parent c1fd5c30d1
commit 6fb37b756a
1 changed files with 16 additions and 1 deletions
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17
fs/btrfs/extent-tree.c
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@ -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;
}
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