Date: Wed, 25 May 2005 13:10:03 -0400 From: David Andersen <dga+@cs.cmu.edu> To: freebsd-hackers@freebsd.org Subject: Opening raw disk while mounted in 5.x? Message-ID: <f7355c61ebfc40d096adb2c862cacf3b@cs.cmu.edu>
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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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