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zfs: fix RAIDZ2/3 not healing parity with 2+ bad disks
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Authored by mm on Mon, Feb 15, 8:02 AM.

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Summary

From openzfs 62d4287f279a0d184f8f332475f27af58b7aa87e commit message:

When scrubbing, (non-sequential) resilvering, or correcting a checksum
error using RAIDZ parity, ZFS should heal any incorrect RAIDZ parity by
overwriting it. For example, if P disks are silently corrupted (P being
the number of failures tolerated; e.g. RAIDZ2 has P=2), zpool scrub
should detect and heal all the bad state on these disks, including
parity. This way if there is a subsequent failure we are fully
protected.

With RAIDZ2 or RAIDZ3, a block can have silent damage to a parity
sector, and also damage (silent or known) to a data sector. In this
case the parity should be healed but it is not.

Cherry-picked from openzfs-master 62d4287f2

MFC after: 3 days

Commit contains simple fix with test.
This fix is data-consistency related and a candidate for 13.0-RELEASE

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R10 FreeBSD src repository
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