Re: filesystem transactions API
From: John Stoffel
Date: Tue Apr 26 2005 - 10:04:21 EST
>>>>> "Jamie" == Jamie Lokier <jamie@xxxxxxxxxxxxx> writes:
Jamie> No. A transaction means that _all_ processes will see the
Jamie> whole transaction or not.
This is really hard. How do you handle the case where process X
starts a transaction modifies files a, b & c, but process Y has file b
open for writing, and never lets it go? Or the file gets unlinked?
Jamie> For example, you can use transactions for distro package
Jamie> management: a whole update of a package would be a single
Jamie> transaction, so that at no time does any program see an
Jamie> inconsistent set of files. See why _every_ process in the
Jamie> system must have the same view?
What about programs that are already open and running?
It might be doable in some sense, but I can see that details are
really hard to get right. Esp without breaking existing Unix
But then again, I could be smoking something good (or bad :-) here, so
take what I say with a grain of salt.
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