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Commit 6fb37b75 authored by Liu Bo's avatar Liu Bo Committed by David Sterba
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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: default avatarLiu Bo <bo.li.liu@oracle.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent c1fd5c30

fs/btrfs/extent-tree.c

+16 −1
Original line number Diff line number Diff line
@@ -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) {

			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]++;