btrfs: add a comment describing delalloc space reservation
delalloc space reservation is tricky because it encompasses both data and metadata. Make it clear what each side does, the general flow of how space is moved throughout the lifetime of a write, and what goes into the calculations. Signed-off-by: NJosef Bacik <josef@toxicpanda.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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