tree 8e64281caffcdb3ad5a8ab8bf22bb90483e9e214
parent 8e0ee43bc2c3e19db56a4adaa9a9b04ce885cd84
author Chris Mason <chris.mason@oracle.com> 1236954299 -0400
committer Chris Mason <chris.mason@oracle.com> 1237925665 -0400

Btrfs: don't preallocate metadata blocks during btrfs_search_slot

In order to avoid doing expensive extent management with tree locks held,
btrfs_search_slot will preallocate tree blocks for use by COW without
any tree locks held.

A later commit moves all of the extent allocation work for COW into
a delayed update mechanism, and this preallocation will no longer be
required.

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