tree 859b579a8253265f2c1c6af9635434fda54486a4
parent dcfac4156fa102c1bab0e4e31df37e47278292f6
author Liu Bo <bo.li.liu@oracle.com> 1356598881 +0000
committer Josef Bacik <jbacik@fusionio.com> 1361371035 -0500

Btrfs: use token to avoid times mapping extent buffer

The API in tree log code has done sort of changes, and it proves that
we can benifit from using token, so do the same thing here.

function_graph tracer's timer shows that it costs nearly half time
of before(39.788us -> 22.391us).

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>