Clean-up async IO internal functions.

diff --git a/server/fd.c b/server/fd.c
index 0dcaee7..ef5b31c 100644
--- a/server/fd.c
+++ b/server/fd.c

@@ -251,7 +251,8 @@
 static struct list timeout_list = LIST_INIT(timeout_list);   /* sorted timeouts list */
 
 /* add a timeout user */
-struct timeout_user *add_timeout_user( struct timeval *when, timeout_callback func, void *private )
+struct timeout_user *add_timeout_user( const struct timeval *when, timeout_callback func,
+                                       void *private )
 {
     struct timeout_user *user;
     struct list *ptr;
@@ -987,12 +988,10 @@
 
 struct async
 {
-    struct fd           *fd;
     struct thread       *thread;
     void                *apc;
     void                *user;
     void                *sb;
-    struct timeval       when;
     struct timeout_user *timeout;
     struct list          entry;
 };
@@ -1022,14 +1021,13 @@
 }
 
 /* create an async on a given queue of a fd */
-struct async *create_async(struct fd *fd, struct thread *thread, int timeout, struct list *queue,
+struct async *create_async(struct thread *thread, int* timeout, struct list *queue,
                            void *io_apc, void *io_user, void* io_sb)
 {
     struct async *async = mem_alloc( sizeof(struct async) );
 
     if (!async) return NULL;
 
-    async->fd = fd;
     async->thread = (struct thread *)grab_object(thread);
     async->apc = io_apc;
     async->user = io_user;
@@ -1039,9 +1037,11 @@
 
     if (timeout)
     {
-        gettimeofday( &async->when, 0 );
-        add_timeout( &async->when, timeout );
-        async->timeout = add_timeout_user( &async->when, async_callback, async );
+        struct timeval when;
+
+        gettimeofday( &when, 0 );
+        add_timeout( &when, *timeout );
+        async->timeout = add_timeout_user( &when, async_callback, async );
     }
     else async->timeout = NULL;
 

diff --git a/server/file.c b/server/file.c
index 3971182..2ce538c 100644
--- a/server/file.c
+++ b/server/file.c

@@ -296,7 +296,7 @@
         return;
     }
 
-    if (!create_async( fd, current, 0, queue, apc, user, iosb ))
+    if (!create_async( current, 0, queue, apc, user, iosb ))
         return;
 
     /* Check if the new pending request can be served immediately */

diff --git a/server/file.h b/server/file.h
index 1e49073..fc65810 100644
--- a/server/file.h
+++ b/server/file.h

@@ -79,12 +79,12 @@
 
 typedef void (*timeout_callback)( void *private );
 
-extern struct timeout_user *add_timeout_user( struct timeval *when,
+extern struct timeout_user *add_timeout_user( const struct timeval *when,
                                               timeout_callback func, void *private );
 extern void remove_timeout_user( struct timeout_user *user );
 extern void add_timeout( struct timeval *when, int timeout );
 /* return 1 if t1 is before t2 */
-static inline int time_before( struct timeval *t1, struct timeval *t2 )
+static inline int time_before( const struct timeval *t1, const struct timeval *t2 )
 {
     return ((t1->tv_sec < t2->tv_sec) ||
             ((t1->tv_sec == t2->tv_sec) && (t1->tv_usec < t2->tv_usec)));
@@ -111,7 +111,7 @@
 extern struct object *create_serial( struct fd *fd, unsigned int options );
 
 /* async I/O functions */
-extern struct async *create_async( struct fd *fd, struct thread *thread, int timeout,
+extern struct async *create_async( struct thread *thread, int* timeout,
                                    struct list *queue, void *, void *, void *);
 extern void async_terminate_head( struct list *queue, int status );
 

diff --git a/server/serial.c b/server/serial.c
index 1ad7461..6f90f5f 100644
--- a/server/serial.c
+++ b/server/serial.c

@@ -267,7 +267,7 @@
         return;
     }
 
-    if (!create_async( fd, current, timeout, queue, apc, user, iosb ))
+    if (!create_async( current, &timeout, queue, apc, user, iosb ))
         return;
 
     /* Check if the new pending request can be served immediately */

diff --git a/server/sock.c b/server/sock.c
index d29233c..f3f27fc 100644
--- a/server/sock.c
+++ b/server/sock.c

@@ -528,7 +528,7 @@
     }
     else
     {
-        if (!create_async( fd, current, 0, queue, apc, user, iosb ))
+        if (!create_async( current, 0, queue, apc, user, iosb ))
             return;
     }