[RFC] tdb_traverse_read_lite()

[Volker Lendecke]

On Mon, Mar 04, 2013 at 05:57:15PM +1030, Rusty Russell wrote:
> Volker Lendecke <Volker.Lendecke at SerNet.DE> writes:
> > On Thu, Feb 28, 2013 at 02:11:18PM +1030, Rusty Russell wrote:
> >> Amitay asked me to look at a lightweight traverse for tdb.  This is my
> >> first attempt (against his ctdb tree, but it's pretty simple).
> >
> > What about doing a traverse by chain? Sure, not atomic
> > whatsoever, but potentially even less intrusive.
> >
> > Volker
> 
> I'm not sure what you mean... this traverses one chain at a time, but it
> holds the lock for that chain across the traverse function.

The API I had in mind traverses just one chain:

int tdb_traverse_chain(struct tdb_context *tdb, int chain,
                       tdb_traverse_func fn, void *private_data)

without dropping the locks in between the callbacks, just as
you did. This way a caller could sleep in between to slow
down a bit, and also learn a bit about the relative load on
the chains.

Volker

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