Re: filesystem transactions API

[Artem B. Bityuckiy]

Jamie Lokier wrote:
> Artem B. Bityuckiy wrote:
>
> 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 :) ]
Hmm, so the whole point to implement transactions in the kernel space is 
to do the transactions in a way that nobody can see any intermediate 
inconsistent state ?


--
Best regards, Artem B. Bityuckiy
Oktet Labs (St. Petersburg), Software Engineer.
+78124286709 (office) +79112449030 (mobile)
E-mail: dedekind@xxxxxxxxxxxx, web: http://www.oktetlabs.ru
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