/* -*- c -*-
   * linux/include/linux/auto_fs4.h
   *
   * Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
   *
   * This file is part of the Linux kernel and is made available under
   * the terms of the GNU General Public License, version 2, or at your
   * option, any later version, incorporated herein by reference.
   */
  
  #ifndef _LINUX_AUTO_FS4_H
  #define _LINUX_AUTO_FS4_H
  
  /* Include common v3 definitions */

  #include <linux/types.h>

  #include <linux/auto_fs.h>
  
  /* autofs v4 definitions */
  #undef AUTOFS_PROTO_VERSION
  #undef AUTOFS_MIN_PROTO_VERSION
  #undef AUTOFS_MAX_PROTO_VERSION

  #define AUTOFS_PROTO_VERSION		5

  #define AUTOFS_MIN_PROTO_VERSION	3

  #define AUTOFS_MAX_PROTO_VERSION	5

  #define AUTOFS_PROTO_SUBVERSION		1

  
  /* Mask for expire behaviour */
  #define AUTOFS_EXP_IMMEDIATE		1
  #define AUTOFS_EXP_LEAVES		2

  #define AUTOFS_TYPE_ANY			0U
  #define AUTOFS_TYPE_INDIRECT		1U
  #define AUTOFS_TYPE_DIRECT		2U
  #define AUTOFS_TYPE_OFFSET		4U
  
  static inline void set_autofs_type_indirect(unsigned int *type)
  {
  	*type = AUTOFS_TYPE_INDIRECT;
  	return;
  }
  
  static inline unsigned int autofs_type_indirect(unsigned int type)
  {
  	return (type == AUTOFS_TYPE_INDIRECT);
  }
  
  static inline void set_autofs_type_direct(unsigned int *type)
  {
  	*type = AUTOFS_TYPE_DIRECT;
  	return;
  }
  
  static inline unsigned int autofs_type_direct(unsigned int type)
  {
  	return (type == AUTOFS_TYPE_DIRECT);
  }
  
  static inline void set_autofs_type_offset(unsigned int *type)
  {
  	*type = AUTOFS_TYPE_OFFSET;
  	return;
  }
  
  static inline unsigned int autofs_type_offset(unsigned int type)
  {
  	return (type == AUTOFS_TYPE_OFFSET);
  }
  
  static inline unsigned int autofs_type_trigger(unsigned int type)
  {
  	return (type == AUTOFS_TYPE_DIRECT || type == AUTOFS_TYPE_OFFSET);
  }
  
  /*
   * This isn't really a type as we use it to say "no type set" to
   * indicate we want to search for "any" mount in the
   * autofs_dev_ioctl_ismountpoint() device ioctl function.
   */
  static inline void set_autofs_type_any(unsigned int *type)
  {
  	*type = AUTOFS_TYPE_ANY;
  	return;
  }
  
  static inline unsigned int autofs_type_any(unsigned int type)
  {
  	return (type == AUTOFS_TYPE_ANY);
  }

  /* Daemon notification packet types */
  enum autofs_notify {
  	NFY_NONE,
  	NFY_MOUNT,
  	NFY_EXPIRE
  };
  
  /* Kernel protocol version 4 packet types */
  
  /* Expire entry (umount request) */
  #define autofs_ptype_expire_multi	2
  
  /* Kernel protocol version 5 packet types */
  
  /* Indirect mount missing and expire requests. */
  #define autofs_ptype_missing_indirect	3
  #define autofs_ptype_expire_indirect	4
  
  /* Direct mount missing and expire requests */
  #define autofs_ptype_missing_direct	5
  #define autofs_ptype_expire_direct	6

  
  /* v4 multi expire (via pipe) */
  struct autofs_packet_expire_multi {
  	struct autofs_packet_hdr hdr;
          autofs_wqt_t wait_queue_token;
  	int len;
  	char name[NAME_MAX+1];
  };

  union autofs_packet_union {
  	struct autofs_packet_hdr hdr;
  	struct autofs_packet_missing missing;
  	struct autofs_packet_expire expire;
  	struct autofs_packet_expire_multi expire_multi;
  };

  /* autofs v5 common packet struct */
  struct autofs_v5_packet {
  	struct autofs_packet_hdr hdr;
  	autofs_wqt_t wait_queue_token;
  	__u32 dev;
  	__u64 ino;
  	__u32 uid;
  	__u32 gid;
  	__u32 pid;
  	__u32 tgid;
  	__u32 len;
  	char name[NAME_MAX+1];
  };
  
  typedef struct autofs_v5_packet autofs_packet_missing_indirect_t;
  typedef struct autofs_v5_packet autofs_packet_expire_indirect_t;
  typedef struct autofs_v5_packet autofs_packet_missing_direct_t;
  typedef struct autofs_v5_packet autofs_packet_expire_direct_t;

  union autofs_v5_packet_union {

  	struct autofs_packet_hdr hdr;

  	struct autofs_v5_packet v5_packet;

  	autofs_packet_missing_indirect_t missing_indirect;
  	autofs_packet_expire_indirect_t expire_indirect;
  	autofs_packet_missing_direct_t missing_direct;
  	autofs_packet_expire_direct_t expire_direct;

  };
  
  #define AUTOFS_IOC_EXPIRE_MULTI		_IOW(0x93,0x66,int)

  #define AUTOFS_IOC_EXPIRE_INDIRECT	AUTOFS_IOC_EXPIRE_MULTI
  #define AUTOFS_IOC_EXPIRE_DIRECT	AUTOFS_IOC_EXPIRE_MULTI

  #define AUTOFS_IOC_PROTOSUBVER		_IOR(0x93,0x67,int)

  #define AUTOFS_IOC_ASKUMOUNT		_IOR(0x93,0x70,int)
  
  
  #endif /* _LINUX_AUTO_FS4_H */