btrfs: kill min_allocable_bytes in inc_block_group_ro
This is a relic from a time before we had a proper reservation mechanism and you could end up with really full chunks at chunk allocation time. This doesn't make sense anymore, so just kill it. Reviewed-by: NQu Wenruo <wqu@suse.com> 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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