[Bug 212139] r298900 introduced a fatal failure case for >2TB disk size reporting bugs

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Thu Aug 25 20:53:28 UTC 2016


--- Comment #4 from Peter Wemm <peter at FreeBSD.org> ---
FWIW; the thought experiment patch is wrong - it does not implement what I
thought  it did.

I still think it is probably the best option though.  The root of the problem
is the read-ahead and we cannot trust size reporting.  The old code did not do
read-ahead. Preventing read-ahead from crossing the end of disk, or an alias of
the end of disk should be more than sufficient to restore old behavior without
adding new hard failure cases.

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