This is a bit of a diversion from what I'm notionally working on at
the moment.  While thinking about what we'd need to use the
IP_TRANSPARENT socket option to broaden the cases where we can
"splice", I noticed some inelegancies in how we handle the pool of
pre-opened sockets in the TCP code, and well, here we are.

This makes a number of cleanups to the handling of these pools.  Most
notably, tcp_splice_connect() now has simpler semantics: it now always
runs in the init namespace, and is always given a pre-opened socket
(which could be in the guest ns).

David Gibson (5):
  tcp: Make a helper to refill each socket pool
  tcp: Split init and ns cases for tcp_sock_refill()
  tcp: Move socket pool declarations around
  tcp: Split pool lookup from creating new sockets in
    tcp_conn_new_sock()
  tcp: Improve handling of fallback if socket pool is empty on new
    splice

 tcp.c        | 138 ++++++++++++++++++-------------------------------
 tcp.h        |   2 -
 tcp_conn.h   |  12 ++++-
 tcp_splice.c | 141 ++++++++++++++++++++++++++-------------------------
 4 files changed, 132 insertions(+), 161 deletions(-)

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2.39.0