[PATCHSET] 9p: clean up a bit and use single poller for trans_fd

[Tejun Heo]

This patchset cleans up 9p and 9p-trans_fd a bit and convert trans_fd
to use single poller instead of poll of pollers and contains the
following six patches.

  0001-9p-implement-proper-trans-module-refcounting-and-un.patch
  0002-9p-trans_fd-fix-trans_fd-p9_conn_destroy.patch
  0003-9p-trans_fd-clean-up-p9_conn_create.patch
  0004-9p-trans_fd-don-t-do-fs-segment-mangling-in-p9_fd_p.patch
  0005-9p-trans_fd-fix-and-clean-up-module-init-exit-paths.patch
  0006-9p-trans_fd-use-single-poller.patch

0001 fixes trans module registration and unregistration.  0002-0005
fix a few bugs in and clean up trans_fd.  0006 converts trans_fd to
use single poller instead of pool of pollers.

Although this patchset fixes a few problem cases but there still are
other synchronization issues in trans_fd.  Most notably, a request
which is being flushed can be freed before r/w works are done with
them.  What's necessary is probably flushing r/w works before actually
destroying the request from flush.  Well, I guess that's for another
day.

This patchset is on top of the current linus#master (399d7f6b) and the
combined diffstat follows.

 include/net/9p/9p.h        |    1 
 include/net/9p/transport.h |    9 -
 net/9p/client.c            |   10 +
 net/9p/mod.c               |   92 ++++++++----
 net/9p/trans_fd.c          |  340 ++++++++++++++-------------------------------
 net/9p/trans_virtio.c      |    2 
 6 files changed, 198 insertions(+), 256 deletions(-)

Thanks.

--
tejun
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