/*
 * Copyright 2008 Red Hat, Inc. All rights reserved.
 * Copyright 2008 Ian Kent <raven@themaw.net>
 *
 * 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_DEV_IOCTL_H
#define _LINUX_AUTO_DEV_IOCTL_H

#include <linux/auto_fs.h>
#include <linux/string.h>

#define AUTOFS_DEVICE_NAME              "autofs"

#define AUTOFS_DEV_IOCTL_VERSION_MAJOR  1
#define AUTOFS_DEV_IOCTL_VERSION_MINOR  0

#define AUTOFS_DEVID_LEN                16

#define AUTOFS_DEV_IOCTL_SIZE           sizeof(struct autofs_dev_ioctl)

/*
 * An ioctl interface for autofs mount point control.
 */

struct args_protover {
        __u32   version;
};

struct args_protosubver {
        __u32   sub_version;
};

struct args_openmount {
        __u32   devid;
};

struct args_ready {
        __u32   token;
};

struct args_fail {
        __u32   token;
        __s32   status;
};

struct args_setpipefd {
        __s32   pipefd;
};

struct args_timeout {
        __u64   timeout;
};

struct args_requester {
        __u32   uid;
        __u32   gid;
};

struct args_expire {
        __u32   how;
};

struct args_askumount {
        __u32   may_umount;
};

struct args_ismountpoint {
        union {
                struct args_in {
                        __u32   type;
                } in;
                struct args_out {
                        __u32   devid;
                        __u32   magic;
                } out;
        };
};

/*
 * All the ioctls use this structure.
 * When sending a path size must account for the total length
 * of the chunk of memory otherwise is is the size of the
 * structure.
 */

struct autofs_dev_ioctl {
        __u32 ver_major;
        __u32 ver_minor;
        __u32 size;             /* total size of data passed in
                                 * including this struct */
        __s32 ioctlfd;          /* automount command fd */

        /* Command parameters */

        union {
                struct args_protover            protover;
                struct args_protosubver         protosubver;
                struct args_openmount           openmount;
                struct args_ready               ready;
                struct args_fail                fail;
                struct args_setpipefd           setpipefd;
                struct args_timeout             timeout;
                struct args_requester           requester;
                struct args_expire              expire;
                struct args_askumount           askumount;
                struct args_ismountpoint        ismountpoint;
        };

        char path[0];
};

static inline void init_autofs_dev_ioctl(struct autofs_dev_ioctl *in)
{
        memset(in, 0, sizeof(struct autofs_dev_ioctl));
        in->ver_major = AUTOFS_DEV_IOCTL_VERSION_MAJOR;
        in->ver_minor = AUTOFS_DEV_IOCTL_VERSION_MINOR;
        in->size = sizeof(struct autofs_dev_ioctl);
        in->ioctlfd = -1;
}

/*
 * If you change this make sure you make the corresponding change
 * to autofs-dev-ioctl.c:lookup_ioctl()
 */
enum {
        /* Get various version info */
        AUTOFS_DEV_IOCTL_VERSION_CMD = 0x71,
        AUTOFS_DEV_IOCTL_PROTOVER_CMD,
        AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD,

        /* Open mount ioctl fd */
        AUTOFS_DEV_IOCTL_OPENMOUNT_CMD,

        /* Close mount ioctl fd */
        AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD,

        /* Mount/expire status returns */
        AUTOFS_DEV_IOCTL_READY_CMD,
        AUTOFS_DEV_IOCTL_FAIL_CMD,

        /* Activate/deactivate autofs mount */
        AUTOFS_DEV_IOCTL_SETPIPEFD_CMD,
        AUTOFS_DEV_IOCTL_CATATONIC_CMD,

        /* Expiry timeout */
        AUTOFS_DEV_IOCTL_TIMEOUT_CMD,

        /* Get mount last requesting uid and gid */
        AUTOFS_DEV_IOCTL_REQUESTER_CMD,

        /* Check for eligible expire candidates */
        AUTOFS_DEV_IOCTL_EXPIRE_CMD,

        /* Request busy status */
        AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD,

        /* Check if path is a mountpoint */
        AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD,
};

#define AUTOFS_IOCTL 0x93

#define AUTOFS_DEV_IOCTL_VERSION \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_VERSION_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_PROTOVER \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_PROTOVER_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_PROTOSUBVER \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_PROTOSUBVER_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_OPENMOUNT \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_OPENMOUNT_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_CLOSEMOUNT \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_CLOSEMOUNT_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_READY \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_READY_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_FAIL \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_FAIL_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_SETPIPEFD \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_SETPIPEFD_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_CATATONIC \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_CATATONIC_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_TIMEOUT \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_TIMEOUT_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_REQUESTER \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_REQUESTER_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_EXPIRE \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_EXPIRE_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_ASKUMOUNT \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_ASKUMOUNT_CMD, struct autofs_dev_ioctl)

#define AUTOFS_DEV_IOCTL_ISMOUNTPOINT \
        _IOWR(AUTOFS_IOCTL, \
              AUTOFS_DEV_IOCTL_ISMOUNTPOINT_CMD, struct autofs_dev_ioctl)

#endif  /* _LINUX_AUTO_DEV_IOCTL_H */