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Btrfs-progs: return an error if we can't find an fs root

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Instead of doing a BUG_ON() if we fail to find the last fs root just return
an error so the callers can deal with it how they like.  Also we need to
actually return an error if we can't find the latest root so that the error
handling works.  With this btrfsck was able to deal with a file system that
was missing a root item but still had extents that referred back to the
root.  Thanks,

Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Josef Bacik 2013-02-01 15:21:04 -05:00 committed by David Sterba
parent 8795e785ce
commit 8a46573c2a
2 changed files with 3 additions and 2 deletions
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3
disk-io.c
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@ -613,7 +613,8 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
root, fs_info, objectid);
ret = btrfs_find_last_root(tree_root, objectid,
&root->root_item, &root->root_key);
BUG_ON(ret);
if (ret)
return ret;
blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
generation = btrfs_root_generation(&root->root_item);

2
root-tree.c
View File

@ -47,7 +47,7 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
slot = path->slots[0] - 1;
btrfs_item_key_to_cpu(l, &found_key, slot);
if (found_key.objectid != objectid) {
ret = 1;
ret = -ENOENT;
goto out;
}
read_extent_buffer(l, item, btrfs_item_ptr_offset(l, slot),