On Friday July 28, [email protected] wrote:
>
> It'd be great if we could deprecate subtree checking some day in the
> distant future....
The first step would be to stop it from being the default (as Trond
has suggested a number of times :-)
How about this.
I release a 1.0.10 shortly which addresses some 'portlist' related
breakage and prints a nasty warning if you have neither subtree_check
or no_subtree_check, but still defaults to subtree_check.
Then the next release will be 1.1.0 which prints the same warning,
but defaults the other way - and probably removed the warning if you
include neither sync not async.
That should at least get subtree_check to be used less.
>
> Would it be feasible to add filesystem support for some sort of
> subvolume-like thing that acted like a mountpoint (in the sense that it
> restricted hardlinks and renames) but that didn't require setting aside
> a separate partition? I imagine that'd probably do what most people
> exporting subtrees want without forcing us to do dubious tricks with
> filehandles.
I think it is a great idea for a 'filesystem' to support multiple
independent file-trees within the one storage set, which is roughly
what you are saying I think (though probably not quite).
However I suspect that most people don't actually want subtrees. They
just get it as the default. It isn't something that I would have
implemented if I hadn't inherited the requirement, and no other OS
that I know of provides that particular semantic.
Maybe we should make it non-default, and then in one year, subtly
break it (maybe reintroduce this bug) and see if anyone notices :-)
(No, that's unethical, I wouldn't do that - really ....)
NeilBrown
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