text: /*-
   * Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   * $FreeBSD: releng/10.2/sys/sys/osd.h 216615 2010-12-21 13:45:29Z lstewart $
   */
  
  #ifndef _SYS_OSD_H_
  #define _SYS_OSD_H_
  
  #include <sys/queue.h>
  
  /*
   * Lock key:
   *   (c) container lock (e.g. jail's pr_mtx) and/or osd_object_lock
   *   (l) osd_list_lock
   */
  struct osd {
  	u_int		  osd_nslots;	/* (c) */
  	void		**osd_slots;	/* (c) */
  	LIST_ENTRY(osd)	  osd_next;	/* (l) */
  };
  
  #ifdef _KERNEL
  
  #define	OSD_THREAD	0
  #define	OSD_JAIL	1
  #define	OSD_KHELP	2
  
  #define	OSD_FIRST	OSD_THREAD
  #define	OSD_LAST	OSD_KHELP
  
  typedef void (*osd_destructor_t)(void *value);
  typedef int (*osd_method_t)(void *obj, void *data);
  
  int osd_register(u_int type, osd_destructor_t destructor,
      osd_method_t *methods);
  void osd_deregister(u_int type, u_int slot);
  
  int osd_set(u_int type, struct osd *osd, u_int slot, void *value);
  void *osd_get(u_int type, struct osd *osd, u_int slot);
  void osd_del(u_int type, struct osd *osd, u_int slot);
  int osd_call(u_int type, u_int method, void *obj, void *data);
  
  void osd_exit(u_int type, struct osd *osd);
  
  #define	osd_thread_register(destructor)					\
  	osd_register(OSD_THREAD, (destructor), NULL)
  #define	osd_thread_deregister(slot)					\
  	osd_deregister(OSD_THREAD, (slot))
  #define	osd_thread_set(td, slot, value)					\
  	osd_set(OSD_THREAD, &(td)->td_osd, (slot), (value))
  #define	osd_thread_get(td, slot)					\
  	osd_get(OSD_THREAD, &(td)->td_osd, (slot))
  #define	osd_thread_del(td, slot)	do {				\
  	KASSERT((td) == curthread, ("Not curthread."));			\
  	osd_del(OSD_THREAD, &(td)->td_osd, (slot));			\
  } while (0)
  #define	osd_thread_call(td, method, data)				\
  	osd_call(OSD_THREAD, (method), (td), (data))
  #define	osd_thread_exit(td)						\
  	osd_exit(OSD_THREAD, &(td)->td_osd)
  
  #define	osd_jail_register(destructor, methods)				\
  	osd_register(OSD_JAIL, (destructor), (methods))
  #define	osd_jail_deregister(slot)					\
  	osd_deregister(OSD_JAIL, (slot))
  #define	osd_jail_set(pr, slot, value)					\
  	osd_set(OSD_JAIL, &(pr)->pr_osd, (slot), (value))
  #define	osd_jail_get(pr, slot)						\
  	osd_get(OSD_JAIL, &(pr)->pr_osd, (slot))
  #define	osd_jail_del(pr, slot)						\
  	osd_del(OSD_JAIL, &(pr)->pr_osd, (slot))
  #define	osd_jail_call(pr, method, data)					\
  	osd_call(OSD_JAIL, (method), (pr), (data))
  #define	osd_jail_exit(pr)						\
  	osd_exit(OSD_JAIL, &(pr)->pr_osd)
  
  #endif	/* _KERNEL */
  
  #endif	/* !_SYS_OSD_H_ */
  