Messages in this thread | | | Date | Tue, 26 Apr 2005 15:32:47 +0100 | From | Jamie Lokier <> | Subject | Re: filesystem transactions API |
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Artem B. Bityuckiy wrote: > Jamie Lokier wrote: > >I think I've wanted something like that for _years_ in unix. > > > >It's an old, old idea, and I've often wondered why we haven't implemented > >it. > > > > I thought it is possible to rather easily to implement this on top > of non-transactional FS (albeit I didn't try) and there is no need > to overcomplicate an FS. Just implement a specialized user-space > library and utilize it.
No. A transaction means that _all_ processes will see the whole transaction or not.
It does _not_ mean that only a subset of programs, which happen to link with a particular user-space library, will see it or not.
For example, you can use transactions for distro package management: a whole update of a package would be a single transaction, so that at no time does any program see an inconsistent set of files. See why _every_ process in the system must have the same view?
[ If you meant that you can implement it with a user-space library that every process in the system links to, that's true. But it would rather misses the point of having filesystems in the kernel at all :) ]
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