btrfs: refactor priority_reclaim_metadata_space
With the eviction flushing stuff we'll want to allow for different states, but still work basically the same way that priority_reclaim_metadata_space works currently. Refactor this to take the flushing states and size as an argument so we can use the same logic for limit flushing and eviction flushing. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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