fifo / named pipe patch testers wanted

[Brian Fundakowski Feldman]

Don Lewis <truckman at FreeBSD.org> wrote:
> Using the vnode mutex in fifo_open() causes lock order problems when
> combined with some of the network stack locking changes that are in
> progress.  The patch below modifies fifo_open() to use a private mutex
> in place of the vnode mutex.  There is also some minor optimization of a
> couple of calls to fifo_cleanup().  This patch has passed my torture
> testing, but it could probably use some more testing by anyone who
> heavily uses named pipes, especially with select(), kqueue(), and SIGIO.
                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Major, major obstacles for fine-grained network stack locking changes in 
progress :-(  This barely scratches the surface of what seems to need to be 
fixed.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green at FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\