[RFC] md raid resync counter

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Hi Neil and all,

Is there anyway to know:

1. How often does a raid start to resync?
2. How many bytes did it resync?

If not, for the first one, I think we cound add field into mddev like
resync_counter, increase when resync done, and annother field into
md_rdev to track how many bytes synced to the outdated disk?

Regards,
Jack
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