/* -*- c -*-
* linux/include/linux/auto_fs4.h
*
* Copyright 1999-2000 Jeremy Fitzhardinge <[email protected]>
*
* 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 2

/* 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 */