zfs code - Aug 2012 - traverse_dataset()

Hi,

I''m currently trying to understand in detail how zfs send and zfs diff
work. While reading traverse_visitbp() I noticed that all data is read
with dsl_read except for objsets, where dsl_read_nolock is used. Can
anybody please shed a little light on why locking can be omitted here?

Thanks,
Arne

On 12.08.2012 12:31, Arne Jansen wrote:
> Hi,
> 
> I''m currently trying to understand in detail how zfs send and zfs
diff
> work. While reading traverse_visitbp() I noticed that all data is read
> with dsl_read except for objsets, where dsl_read_nolock is used. Can
> anybody please shed a little light on why locking can be omitted here?
... because it''s the top level bp, all others get their parent passed.
> 
> Thanks,
> Arne