btrfs: add a comment describing block reserves
This is a giant comment at the top of block-rsv.c describing generally how block reserves work. It is purely about the block reserves themselves, and nothing to do with how the actual reservation system works. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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