148 lines
4.2 KiB
C
148 lines
4.2 KiB
C
/*
|
|
* Copyright (c) 1995, David Greenman
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by David Greenman.
|
|
* 4. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $Id: default_pager.c,v 1.6 1996/01/19 03:59:36 dyson Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <vm/vm_prot.h>
|
|
#include <vm/vm_object.h>
|
|
#include <vm/vm_page.h>
|
|
#include <vm/vm_pager.h>
|
|
#include <vm/default_pager.h>
|
|
#include <vm/swap_pager.h>
|
|
|
|
static vm_object_t default_pager_alloc __P((void *, vm_size_t, vm_prot_t,
|
|
vm_ooffset_t));
|
|
static void default_pager_dealloc __P((vm_object_t));
|
|
static int default_pager_getpages __P((vm_object_t, vm_page_t *, int, int));
|
|
static int default_pager_putpages __P((vm_object_t, vm_page_t *, int,
|
|
boolean_t, int *));
|
|
static boolean_t default_pager_haspage __P((vm_object_t, vm_pindex_t, int *,
|
|
int *));
|
|
/*
|
|
* pagerops for OBJT_DEFAULT - "default pager".
|
|
*/
|
|
struct pagerops defaultpagerops = {
|
|
NULL,
|
|
default_pager_alloc,
|
|
default_pager_dealloc,
|
|
default_pager_getpages,
|
|
default_pager_putpages,
|
|
default_pager_haspage,
|
|
NULL
|
|
};
|
|
|
|
/*
|
|
* no_pager_alloc just returns an initialized object.
|
|
*/
|
|
static vm_object_t
|
|
default_pager_alloc(handle, size, prot, offset)
|
|
void *handle;
|
|
register vm_size_t size;
|
|
vm_prot_t prot;
|
|
vm_ooffset_t offset;
|
|
{
|
|
if (handle != NULL)
|
|
panic("default_pager_alloc: handle specified");
|
|
|
|
return vm_object_allocate(OBJT_DEFAULT, OFF_TO_IDX(offset) + size);
|
|
}
|
|
|
|
static void
|
|
default_pager_dealloc(object)
|
|
vm_object_t object;
|
|
{
|
|
/*
|
|
* OBJT_DEFAULT objects have no special resources allocated to them.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* The default pager has no backing store, so we always return
|
|
* failure.
|
|
*/
|
|
static int
|
|
default_pager_getpages(object, m, count, reqpage)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int count;
|
|
int reqpage;
|
|
{
|
|
return VM_PAGER_FAIL;
|
|
}
|
|
|
|
static int
|
|
default_pager_putpages(object, m, c, sync, rtvals)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int c;
|
|
boolean_t sync;
|
|
int *rtvals;
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* Try to convert the object type into a OBJT_SWAP.
|
|
* If the swp structure allocation fails, convert it
|
|
* back to OBJT_DEFAULT and return failure. Otherwise
|
|
* pass this putpages to the swap pager.
|
|
*/
|
|
object->type = OBJT_SWAP;
|
|
|
|
if (swap_pager_swp_alloc(object, M_KERNEL) != 0) {
|
|
if (swap_pager_swp_alloc(object, M_NOWAIT) != 0) {
|
|
object->type = OBJT_DEFAULT;
|
|
for (i = 0; i < c; i++)
|
|
rtvals[i] = VM_PAGER_FAIL;
|
|
return VM_PAGER_FAIL;
|
|
}
|
|
}
|
|
|
|
return swap_pager_putpages(object, m, c, sync, rtvals);
|
|
}
|
|
|
|
static boolean_t
|
|
default_pager_haspage(object, pindex, before, after)
|
|
vm_object_t object;
|
|
vm_pindex_t pindex;
|
|
int *before;
|
|
int *after;
|
|
{
|
|
return FALSE;
|
|
}
|