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A few callers of alloc_move_empty in the server were providing a budget that was too small. Recent changes to extent_mod_blocks increased the max budget that is necessary to move extents between btrees. The existing WAG of 100 was too small for trees of height 2 and 3. This caused looping in production. We can increase the move budget to half the overall commit budget, which leaves room for a height of around 7 each. This is much greater than we see in practice because the size of the per-mount btrees is effectiely limited by both watermarks and thresholds to commit and drain. Signed-off-by: Zach Brown <zab@versity.com>