> > in addition you will have lots of potential races as one system reads a
> > block of data, modifies it, then writes it while the other system does the
>
> Uh, I am confident that there can be no races with respect to data
> writes provided I manage to make the VFS operations atomic via
> appropriate shared locking. What one has to get rid of is cached
> metadata state. I'm open to suggestions.
well you will have to change the filesystems to attempt your new atomic
VFS operations, today the kernel ext2 driver can just aquire a lock,
diddle with whatever it wants, and write the result. it doesn't do
anything that the VFS will see as atomic.
David Lang
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