only delete space used by inode, on inode deletion; required

[unix-history] / usr / src / sys / vm / vnode_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%
*
*      @(#)vnode_pager.h       7.1 (Berkeley) %G%
*/

#ifndef _VNODE_PAGER_
#define _VNODE_PAGER_   1

/*
* VNODE pager private data.
*/
struct vnpager {
       int             vnp_flags;      /* flags */
       struct vnode    *vnp_vp;        /* vnode */
       vm_size_t       vnp_size;       /* vnode current size */
};
typedef struct vnpager  *vn_pager_t;

#define VN_PAGER_NULL   ((vn_pager_t)0)

#define VNP_PAGING      0x01            /* vnode used for pageout */
#define VNP_CACHED      0x02            /* vnode is cached */

#ifdef KERNEL

void            vnode_pager_init();
vm_pager_t      vnode_pager_alloc();
void            vnode_pager_dealloc();
int             vnode_pager_getpage(), vnode_pager_putpage();
boolean_t       vnode_pager_haspage();

struct pagerops vnodepagerops = {
       vnode_pager_init,
       vnode_pager_alloc,
       vnode_pager_dealloc,
       vnode_pager_getpage,
       vnode_pager_putpage,
       vnode_pager_haspage
};

#endif

#endif  /* _VNODE_PAGER_ */