shared/linux/auto_dev-ioctl.h

/*
 * 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>

#ifdef __KERNEL__
#include <linux/string.h>
#else
#include <string.h>
#endif /* __KERNEL__ */

#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;
    return;
}

/*
 * 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 */