Btrfs: don't loop in allocator for space cache
The space cache needs to have contiguous allocations, and the allocator tries to make allocations by reducing the amount of bytes requested and re-searching. But this just makes us waste time when we are very fragmented, so if we can't find our space just exit, don't bother trying to search again. Thanks, Signed-off-by: NJosef Bacik <jbacik@fb.com> Signed-off-by: NChris Mason <clm@fb.com>
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