ioctl.h

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/*
  FUSE-ioctl: ioctl support for FUSE
  Copyright (C) 2008       SUSE Linux Products GmbH
  Copyright (C) 2008       Tejun Heo <teheo@suse.de>

  This program can be distributed under the terms of the GNU GPL.
  See the file COPYING.
*/

#include <sys/types.h>
#include <sys/uio.h>
#include <sys/ioctl.h>

enum {
        FIOC_GET_SIZE   = _IOR('E', 0, size_t),
        FIOC_SET_SIZE   = _IOW('E', 1, size_t),

        /*
         * The following two ioctls don't follow usual encoding rules
         * and transfer variable amount of data.
         */
        FIOC_READ       = _IO('E', 2),
        FIOC_WRITE      = _IO('E', 3),
};

struct fioc_rw_arg {
        off_t           offset;
        void            *buf;
        size_t          size;
        size_t          prev_size;      /* out param for previous total size */
        size_t          new_size;       /* out param for new total size */
};