https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212139

--- Comment #4 from Peter Wemm <[email protected]> ---
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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