raid1: metadata 1.2 size calculation formula needed

[Sebastian Riemer <sebastian.riemer@xxxxxxxxxxxxxxxx>]

Hi Neil, hi others,

we want to be able to calculate the size of the MD metadata 1.2 + bitmap
size in advance before creating MD RAID 1 volumes.
Is there somewhere a documented formula?

I guess the metadata is at fixed size + 0x1000 at the beginning of the
block device. Then, the bitmap size depends on the bitmap chunksize +
boundary filling.

When growing/shrinking, the bitmap remains at the size from creation and
only the bitmap chunksize is adjusted, right?

Cheers,
Sebastian

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Sebastian Riemer
Linux Kernel Developer

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