tree b1b56f48e76006662798508f20c2b2d1378fd04f
parent 56bec294dea971335d4466b30f2d959f28f6e36d
author Chris Mason <chris.mason@oracle.com> 1236953071 -0400
committer Chris Mason <chris.mason@oracle.com> 1237925665 -0400

Btrfs: reduce stack usage in some crucial tree balancing functions

Many of the tree balancing functions follow the same pattern.

1) cow a block
2) do something to the result

This commit breaks them up into two functions so the variables and
code required for part two don't suck down stack during part one.

Signed-off-by: Chris Mason <chris.mason@oracle.com>