tree 6741d562d70b46dc8660954e08174c79a91719fd
parent 78a587c608f9ef0b0f7bd0bb5f4165a61a782862
author Liu Bo <bo.li.liu@oracle.com> 1473868306 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1483697770 +0100

Btrfs: return gracefully from balance if fs tree is corrupted

commit 3561b9db70928f207be4570b48fc19898eeaef54 upstream.

When relocating tree blocks, we firstly get block information from
back references in the extent tree, we then search fs tree to try to
find all parents of a block.

However, if fs tree is corrupted, eg. if there're some missing
items, we could come across these WARN_ONs and BUG_ONs.

This makes us print some error messages and return gracefully
from balance.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>