To answer my own question - this appears to be done in the geom
subsystem now. It can be avoided by enabling the magic foot-shooting
debug flag:
sysctl -w kern.geom.debugflags=16
if you're inclined to shoot yourself in the foot.
-Dave
On May 25, 2005, at 1:10 PM, David Andersen wrote:
Hoping someone knows the quick answer to this - in 4.x, it was
possible to open /dev/ad0 while a filesystem one one of its slices was
mounted. This no longer appears possible under 5.x. Could someone
point me to the spot in the code where I'd need to disable a
permissions check (or a sysctl, or anything) to permit this behavior
again?
(The context: mounting slice 2 of a disk and using it to store a
compressed filesystem image. Then opening the primary disk device to
directly write the filesystem image onto slice 1. The kernel seems to
muck with the write calls if we try to do the write onto slice 1
instead of the raw disk). This is using the very cool
imagezip/imageunzip utilities from the Utah Emulab project.
Thanks!
-Dave
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