On Fri, 3 Mar 2000, Michael Bacarella wrote:
> Can someone tell me why copy-on-write filesystems would be bad?
It's a good idea. Peter Braam and I have written a device (called memdev)
for linux (sorry!) that implements a virtual-memory-backed copy-on-write
block device (like the loopback device, but uses anon vm pages for store).
It's pretty interesting. It's quite fast, and copy-on-write does seem to
work OK for a filesystem. I'm using this thing as one of two pieces of a
new private name space implementation that would also work quite well on
freebsd.
note it's not really a file system, but a loopback block device which does
copy-on-write for new blocks.
You can also use it to easily implement translucent file system behaviour.
ron
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