btrfs: allow block group background reclaim for non-zoned filesystems
This will allow us to set a threshold for block groups to be automatically relocated even if we don't have zoned devices. We have found this feature invaluable at Facebook due to how our workload interacts with the allocator. We have been using this in production for months with only a single problem that has already been fixed. Tested-by: NPankaj Raghav <p.raghav@samsung.com> Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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