econet partially annotated.

It's still badly broken - it mixes userland and kernel chunks in the
same iovec, then does set_fs(KERNEL_FS) and sends that to
sock_sendmsg().  Do we still want to support that protocol family,
anyway?

	dev_ioctl() has a __user pointer argument; however, its declaration
lacks that and callers are also wrong.  Declaration fixed, callers updated.

Under SELinux, and potentially other LSMs, we need to be able to
distinguish between user sockets and kernel sockets.  For SELinux
specifically, kernel sockets need to be specially labeled during creation,
then bypass access control checks (they are controlled by the kernel
itself and not subject to SELinux mediation).

This addresses a class of potential issues in SELinux where, for example, 
a TCP NFS session times out, then the kernel re-establishes an RPC 
connection upon further user activity.  We do not want such kernel 
created sockets to be labeled with user security contexts.

sock_create() and sock_create_kern() are wrapper functions, which seems 
semantically clearer to me than e.g. adding a flag to sock_create().  If 
you prefer the latter, then let me know.

The patch also adds an argument to the LSM socket creation functions
indicating whether the socket being created is a kernel socket or not.

Also, make sure NET_RX_DROP is returned if we did not accept the
packet.

Previously, default aliases were hardwired into modutils.  Now they
should be inside the modules, using MODULE_ALIAS() (they will be overridden
by any user alias).

With this we make it easier to write correct network families as less
details need to be taken into account, as well in the current state we
make the non-refcounting protocols (the ones still keeping deliver_to_old_ones
in the tree) suck less. 8)

Left a WARN_ON in sk_del_node_init for a while, so that we can catch cases
where we're using __sock_put on a struct sock that has refcnt == 1, which
is not the case for all the ones I tested.

With this the data dependency is reduced to just making sure that the first
member of both struct sock and struct tcp_tw_bucket are a struct sock_common.

Also makes it easier to grep for struct sock and struct tcp_tw_bucket usage in
the tree as all the members in those structs are prefixed, respectively, with
sk_ and tw_, like struct inode (i_), struct block_device (bd_), etc.

Checked namespace with make tags/ctags, just one colision with the macros for
the struct sock members, with a wanrouter struct, fixed that
s/sk_state/state_sk/g in the wanrouter struct.

Checked as well if the names of the members in both structs collided with some
macro, none found.

This makes:

1. simpler primitive to access struct sock flags, shorter
2. we check if the flag is valid by using enum sock_flags
3. we can change the implementation to an open coded bit operations
   if it proves to be faster than the more general bit manipulation
   routines now used, i.e. we only have to change sock.h, not the
   whole net tree like now

Using THIS_MODULE in the struct proto_ops registered with the core.

Now the core networking infrastructure will (finally) do that for the net
protocol families, its just a matter of setting the ->owner field in the
registered struct net_proto_family to THIS_MODULE.

1) Pull scm argument from sendmsg/recvmsg, it is available
from I/O control block
2) Consolidate networking syscall compat call into net/compat.c
3) Change ops->{sendmsg,recvmsg}() code sequences into sock_{sendmsg,recvmsg}()

This is a cleanup of the sigio/sigurg code.

Summary:
  o Removed sk->proc, SIGURG now sent via vfs, credentials checked
    during delivery.
  o SIOCSPGRP etc. ioctls use vfs, and work now for SIGIO as well
    as SIGURG.
  o Removed socket fcntl code.
  o Consolidate lsm file_set_fowner() hooks.
  o Fixed fowner race.
  o Fixed associated mainline memory leak in fcntl_dirnotify().

Still a few out there.. Most of these from 2.4

out of struct sock.
Fix -EFAULT handling in TCP direct user copy handling.
Use struct initializers in IPV6 ndisc code.

Work done by Arnaldo Carvalho de Melo.

  - me: fix GFB_BUFFER thinkos. Make buffer syncing more efficient.
  Make sure we don't leave buffers on the LOCKED list forever
  - David Miller: networking and sparc updates

  - Mike Phillips: olympic driver update
  - Alan Cox: continued resyncing (lots of small stuff, big NTFS merge from Anton)
  - Martin Dalecki: cleanup (remove unused and unnecessary get_hardblocksize)
  - Chris Mason: fix potential reiserfs journal overflow
  - Jeff Garzik: network driver updates
  - David Miller: sparc fixes, some network cleanups

  - Hui-Fen Hsu: sis900 driver update
  - NIIBE Yutaka: Super-H update
  - Alan Cox: more resyncs (ARM down, but more to go)
  - David Miller: network zerocopy, Sparc sync, qlogic,FC fix, etc.
  - David Miller/me: get rid of various drivers hacks to do mmap
  alignment behind the back of the VM layer. Create a real
  protocol for it.