Since now open_ctree_fs_info() can even return a valid fs_info with only
system chunk mapping from super block, use this ability to do chunk root
search for heavily damanged fs.
As an fast alternative for time consuming and buggy chunk-recovery.
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Introduce new find-root.[ch] infrastructure which has better tree root
judgment and uses much less codes to do it.
The new infrastructure will only record tree blocks with highest level
among its generation, and do better judgment whether the found tree block
is the desired one(level + generation check other than the original
generation only check).
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
