tree cc52193e1d2d12923cdfe2749c3f74102bb9751e
parent fb25e9141ab843794d5cdef3936ccb58435e2371
author Josef Bacik <josef@redhat.com> 1312214898 -0400
committer Josef Bacik <josef@redhat.com> 1319051550 -0400

Btrfs: skip looking for delalloc if we don't have ->fill_delalloc

We always look for delalloc bytes in our io_tree so we can fill in delalloc.
This is fine in most cases, but if we're writing out the btree_inode this is
just a superfluous tree search on the io_tree, and if we have a lot of metadata
dirty this could be an expensive check.  So instead check to see if our io_tree
has a ->fill_delalloc op, and if not don't even bother doing the lookup.
Thanks,

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