[Bug 212139] r298900 introduced a fatal failure case for >2TB disk size reporting bugs
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Thu Aug 25 22:18:20 UTC 2016
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212139
Peter Wemm <peter at FreeBSD.org> changed:
What |Removed |Added
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Attachment #174075|0 |1
is obsolete| |
--- Comment #5 from Peter Wemm <peter at FreeBSD.org> ---
Created attachment 174080
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=174080&action=edit
Prevent read-ahead from crossing 32 bit aliases of end-of-disk
I think this patch will work. I've been running it in a test rig to check for
wrapping and aliasing scenarios. I'll test it shortly.
Note that it uses tcp-style sequence space signed arithmetic to handle
wraparounds. The use of signed math is intentional.
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