af_unix: Explicitly include headers for non-pointer struct fields.

include/net/af_unix.h indirectly includes some definitions for structs.

Let's include such headers explicitly.

linux/atomic.h : scm_stat.nr_fds
linux/net.h : unix_sock.peer_wq
linux/path.h : unix_sock.path
linux/spinlock.h : unix_sock.lock
linux/wait.h : unix_sock.peer_wake
uapi/linux/un.h : unix_address.name[]

linux/socket.h is removed as the structs there are not used directly,
and linux/un.h is clarified with uapi as un.h only exists under
include/uapi.

While at it, duplicate headers are removed from .c files.

Signed-off-by: Kuniyuki Iwashima <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/net/af_unix.h

···
 #ifndef __LINUX_NET_AFUNIX_H
 #define __LINUX_NET_AFUNIX_H
 
+#include <linux/atomic.h>
 #include <linux/mutex.h>
+#include <linux/net.h>
+#include <linux/path.h>
 #include <linux/refcount.h>
-#include <linux/socket.h>
-#include <linux/un.h>
+#include <linux/spinlock.h>
+#include <linux/wait.h>
 #include <net/sock.h>
+#include <uapi/linux/un.h>
 
 #if IS_ENABLED(CONFIG_UNIX)
 struct unix_sock *unix_get_socket(struct file *filp);

net/unix/af_unix.c

···
 #include <linux/module.h>
 #include <linux/mount.h>
 #include <linux/namei.h>
-#include <linux/net.h>
 #include <linux/netdevice.h>
 #include <linux/poll.h>
 #include <linux/proc_fs.h>
···
 #include <linux/string.h>
 #include <linux/termios.h>
 #include <linux/uaccess.h>
-#include <linux/un.h>
 #include <net/af_unix.h>
 #include <net/checksum.h>
 #include <net/net_namespace.h>
 #include <net/scm.h>
-#include <net/sock.h>
 #include <net/tcp_states.h>
 
 #include "af_unix.h"

net/unix/diag.c

···
 #include <linux/module.h>
 #include <linux/skbuff.h>
 #include <linux/sock_diag.h>
-#include <linux/spinlock.h>
 #include <linux/types.h>
-#include <linux/uidgid.h>
 #include <linux/unix_diag.h>
 #include <net/af_unix.h>
 #include <net/netlink.h>
-#include <net/sock.h>
 #include <net/tcp_states.h>
 
 #include "af_unix.h"

net/unix/garbage.c

···
 #include <linux/file.h>
 #include <linux/fs.h>
 #include <linux/kernel.h>
-#include <linux/mutex.h>
-#include <linux/net.h>
 #include <linux/netdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/skbuff.h>
 #include <linux/socket.h>
 #include <linux/string.h>
-#include <linux/un.h>
-#include <linux/wait.h>
 #include <net/af_unix.h>
 #include <net/scm.h>
-#include <net/sock.h>
 #include <net/tcp_states.h>
 
 #include "af_unix.h"

net/unix/unix_bpf.c

···
 #include <linux/bpf.h>
 #include <linux/skmsg.h>
 #include <net/af_unix.h>
-#include <net/sock.h>
 
 #include "af_unix.h"