Calculating/estimating the process of an ongoing balance

[Andreas Philipp <philipp.andreas@gmail.com>]

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Hi all,

During a btrfs filesystem balance there are lines like the following
one in dmesg
btrfs: relocating block group 2122280075264 flags 9
Since the "big" number is strictly decreasing, I wonder whether this
can be used as some progress counter? For example,
do I get something like a percentage of what has been done/balanced by
the following formula:
(h-l)/h
where h is the highest, i.e. first, value and l is the last, i.e.
smallest, value?

Just for interest: There are two types of these lines appearing. One
type with 'flags 9' and one with 'flags 20'. Do the first ones refer
to block groups holding metadata and the second ones to block groups
holding data or is it totally different (and more complicated)?

Thanks,
Andreas Philipp
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