Lustre devel - Dec 2006 - Yet still more LND

In functions like lnd_send and lnd_recv, what''s the protocol around use
of the
iov and kiov which come in with the lntmsg?  Is it safe to copy pointers to
them, or do I need to copy the contents?  I guess this is another way of
asking whether the lntmsg is going to hang around unmolested until
lnet_finalize(). 

I suppose the same question could be asked about the hdr as well.  If the
lntmsg really is safe until finalize, presumably it''s safe for me to
just keep
a pointer to him, or anything contained within him, as needed, eh?

> In functions like lnd_send and lnd_recv, what''s the protocol 
> around use of the iov and kiov which come in with the lntmsg?
> Is it safe to copy pointers to them, or do I need to copy the
> contents?  I guess this is another way of asking whether the
> lntmsg is going to hang around unmolested until lnet_finalize(). 
Yes it is.  msg_iov/kiov etc are stable until the finalize.  But
you may only read them.
> I suppose the same question could be asked about the hdr as 
> well.  If the lntmsg really is safe until finalize, presumably
> it''s safe for me to just keep a pointer to him, or anything
> contained within him, as needed, eh?
Yes - same.

                Cheers,
                        Eric

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From: "Eric Barton" <eeb@bartonsoftware.com>
    Date: Tue, 5 Dec 2006 15:45:04 -0000
    
    > In functions like lnd_send and lnd_recv, what''s the protocol 
    > around use of the iov and kiov which come in with the lntmsg?
    > Is it safe to copy pointers to them, or do I need to copy the
    > contents?  I guess this is another way of asking whether the
    > lntmsg is going to hang around unmolested until lnet_finalize(). 
    
    Yes it is.  msg_iov/kiov etc are stable until the finalize.  But
    you may only read them.

Sure.  I just didn''t to manage my own copies if I didn''t need
to.
    
    > I suppose the same question could be asked about the hdr as 
    > well.  If the lntmsg really is safe until finalize, presumably
    > it''s safe for me to just keep a pointer to him, or anything
    > contained within him, as needed, eh?
    
    Yes - same.
    
Spiff.  Tnx.