[GIT PULL] 9p fixes for 6.1

[Dominique Martinet]

The following changes since commit b90cb1053190353cc30f0fef0ef1f378ccc063c5:

  Linux 6.0-rc3 (2022-08-28 15:05:29 -0700)

are available in the Git repository at:

  https://github.com/martinetd/linux tags/9p-for-6.1

for you to fetch changes up to a8e633c604476e24d26a636582c0f5bdb421e70d:

  net/9p: clarify trans_fd parse_opt failure handling (2022-10-07 21:23:09 +0900)

----------------------------------------------------------------
9p-for-6.1: smaller buffers for small messages and fixes

The highlight of this PR is Christian's patch to allocate smaller buffers
for most metadata requests: 9p with a big msize would try to allocate large
buffers when just 4 or 8k would be more than enough; this brings in nice
performance improvements.

There's also a few fixes for problems reported by syzkaller (thanks to
Schspa Shi, Tetsuo Handa for tests and feedback/patches) as well as some
minor cleanup

----------------------------------------------------------------
Christian Schoenebeck (5):
      net/9p: split message size argument into 't_size' and 'r_size' pair
      9p: add P9_ERRMAX for 9p2000 and 9p2000.u
      net/9p: add p9_msg_buf_size()
      net/9p: add 'pooled_rbuffers' flag to struct p9_trans_module
      net/9p: allocate appropriate reduced message buffers

Dominique Martinet (2):
      9p: trans_fd/p9_conn_cancel: drop client lock earlier
      net/9p: use a dedicated spinlock for trans_fd

Li Zhong (1):
      net/9p: clarify trans_fd parse_opt failure handling

Tetsuo Handa (1):
      9p/trans_fd: always use O_NONBLOCK read/write

Xiu Jianfeng (1):
      net/9p: add __init/__exit annotations to module init/exit funcs

 include/net/9p/9p.h        |   3 +++
 include/net/9p/transport.h |   5 ++++
 net/9p/client.c            |  48 +++++++++++++++++++++++++++++++--------
 net/9p/protocol.c          | 167 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 net/9p/protocol.h          |   2 ++
 net/9p/trans_fd.c          |  50 ++++++++++++++++++++++++++--------------
 net/9p/trans_rdma.c        |   1 +
 net/9p/trans_virtio.c      |   1 +
 net/9p/trans_xen.c         |   5 ++--
 9 files changed, 254 insertions(+), 28 deletions(-)
--
Dominique