usr/src/sys/vm/device_pager.h

/*
 * Copyright (c) 1990 University of Utah.
 * Copyright (c) 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)device_pager.h      7.2 (Berkeley) %G%
 */

#ifndef _DEVICE_PAGER_
#define _DEVICE_PAGER_  1

/*
 * Device pager private data.
 */
struct devpager {
        queue_head_t    devp_list;      /* list of managed devices */
        dev_t           devp_dev;       /* devno of device */
        vm_page_t       devp_pages;     /* page structs for device */
        int             devp_npages;    /* size of device in pages */
        int             devp_count;     /* reference count */
        vm_object_t     devp_object;    /* object representing this device */
};
typedef struct devpager *dev_pager_t;

#define DEV_PAGER_NULL  ((dev_pager_t)0)

#endif  /* _DEVICE_PAGER_ */