Tom Keiser schrieb:
I'll note that bitmap-later is also dangerous--it has several known
race conditions (e.g. VFreeBitmapEntry_r is just plain wrong;
GetBitmap() relies upon microarchitectural store ordering rules that
no modern processor guarantees, ...). These can result in various
classes of corruption from vnodes that fail to be freed until salvage,
to multiple allocations of the same vnode.
Thanks for the hint - could you elaborate on that?
I frowned first time I saw VOL_UNLOCK prior to calling GetBitmap but trusted
in the code being water-proof. Perhaps this deserves a fix until the dust
around DAFS settles.
--
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Rainer Toebbicke
European Laboratory for Particle Physics(CERN) - Geneva, Switzerland
Phone: +41 22 767 8985 Fax: +41 22 767 7155
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