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efc19c3d75
When the fs_root is too short for subtrees, get_parent returns the entire root for every request. Multiple concurrent merges would each independently CoW and modify the same root tree. Processing their completions would replace the root with each result, only keeping the last and orphaning blocks allocated by earlier completions. Limit to one outstanding request when fs_root.height <= 2 to prevent this. Signed-off-by: Auke Kok <auke.kok@versity.com>