tree 801cdba60d8cfa7c5aa9ecb2b396ba61d5cad9ab
parent a9b5fcddce594a408a48d523087b5bb64ce82469
author Josef Bacik <josef@redhat.com> 1313783152 -0400
committer Josef Bacik <josef@redhat.com> 1319051559 -0400

Btrfs: fix space leak when we fail to make an allocation

When changing back to using a spin_lock to protect the extent counters I decided
that since we would only be dropping our original extent, it was ok to just drop
the extent and return.  However since somebody else could have come in and done
a reservation, we need to do the normal song and dance to clear the reservation
out properly.  So calculate how much space we need to free, and then subtract
what we just attempted to reserve.  If it's more then we know we need to drop
those bytes from the delalloc block rsv.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>