Btrfs: more efficient split extent state insertion
When we split an extent state there's no need to start the rbtree search from the root node - we can start it from the original extent state node, since we would end up in its subtree if we do the search starting at the root node anyway. Signed-off-by: NFilipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: NJosef Bacik <jbacik@fb.com>
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