[Gluster-devel] Gluster internals

[Ian Latter]

Hello,


  Couple of questions that might help make my
module a little more sane;

    0) Is there any developer docco?  I've just done
        another quick search and I can't see any.  Let
        me know if there is and I'll try and answer the
        below myself.

    1) What is the difference between STACK_WIND
        and STACK_WIND_COOKIE?  I.e. I've only
        ever used STACK_WIND, when should I use
        it versus the other?

    2) Is there a way to write linearly within a single
        function within Gluster (or is there a reason
        why I wouldn't want to do that)?  


RE 2: 

  This may stem from my lack of understanding 
of the broader Gluster internals.  I am performing 
multiple fops per fop, which is creating structural
inelegances in the code that make me think I'm
heading down the wrong rabbit hole.  I want to 
say;

   read() {
     // pull in other content
     while(want more) {
       _lookup()
       _open()
       _read()
       _close()
     }
     return iovec
  }


But the way I've understood the Gluster internal
structure is that I need to operate in a chain of
related functions;

  _read_lookup_cbk_open_cbk_read_cbk() {
       wind _close()
  }

  _read_lookup_cbk_open_cbk() {
       wind _read()
       add to local->iovec
  }

  _lookup_cbk() {
       wind _open()
  }

  read() {
     while(want more) {
       wind _lookup()
     }
     return local->iovec
  }



Am I missing something - or is there a nicer way of 
doing this?


Cheers,



--
Ian Latter
Late night coder ..
http://midnightcode.org/