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d8231016f8
After we've merged a log btree back into the main fs tree we kick off work to free all its blocks. This would fully fill the transactions free blocks list before stopping to apply the commit. Consuming the entire free list makes it hard to have concurrent holders of a commit who also want to free things. This chnages the log btree block freeing to limit itself to a fraction of the budget that each holder gets. That coarse limit avoids us having to precisely account for the allocations and frees while modifying the freeing item while still freeing many blocks per commit. Signed-off-by: Zach Brown <zab@versity.com>