200 lines
6.1 KiB
C
200 lines
6.1 KiB
C
/*-
|
|
* Copyright (c) 1990 University of Utah.
|
|
* Copyright (c) 1991, 1993
|
|
* 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.
|
|
*
|
|
* 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.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
|
|
*
|
|
* @(#)vm_pager.h 8.4 (Berkeley) 1/12/94
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Pager routine interface definition.
|
|
*/
|
|
|
|
#ifndef _VM_PAGER_
|
|
#define _VM_PAGER_
|
|
|
|
#include <sys/queue.h>
|
|
|
|
TAILQ_HEAD(pagerlst, vm_object);
|
|
|
|
struct bio;
|
|
|
|
typedef void pgo_init_t(void);
|
|
typedef vm_object_t pgo_alloc_t(void *, vm_ooffset_t, vm_prot_t, vm_ooffset_t);
|
|
typedef void pgo_dealloc_t(vm_object_t);
|
|
typedef int pgo_getpages_t(vm_object_t, vm_page_t *, int, int);
|
|
typedef void pgo_putpages_t(vm_object_t, vm_page_t *, int, int, int *);
|
|
typedef boolean_t pgo_haspage_t(vm_object_t, vm_pindex_t, int *, int *);
|
|
typedef void pgo_pageunswapped_t(vm_page_t);
|
|
|
|
struct pagerops {
|
|
pgo_init_t *pgo_init; /* Initialize pager. */
|
|
pgo_alloc_t *pgo_alloc; /* Allocate pager. */
|
|
pgo_dealloc_t *pgo_dealloc; /* Disassociate. */
|
|
pgo_getpages_t *pgo_getpages; /* Get (read) page. */
|
|
pgo_putpages_t *pgo_putpages; /* Put (write) page. */
|
|
pgo_haspage_t *pgo_haspage; /* Does pager have page? */
|
|
pgo_pageunswapped_t *pgo_pageunswapped;
|
|
};
|
|
|
|
extern struct pagerops defaultpagerops;
|
|
extern struct pagerops swappagerops;
|
|
extern struct pagerops vnodepagerops;
|
|
extern struct pagerops devicepagerops;
|
|
extern struct pagerops physpagerops;
|
|
|
|
/*
|
|
* get/put return values
|
|
* OK operation was successful
|
|
* BAD specified data was out of the accepted range
|
|
* FAIL specified data was in range, but doesn't exist
|
|
* PEND operations was initiated but not completed
|
|
* ERROR error while accessing data that is in range and exists
|
|
* AGAIN temporary resource shortage prevented operation from happening
|
|
*/
|
|
#define VM_PAGER_OK 0
|
|
#define VM_PAGER_BAD 1
|
|
#define VM_PAGER_FAIL 2
|
|
#define VM_PAGER_PEND 3
|
|
#define VM_PAGER_ERROR 4
|
|
#define VM_PAGER_AGAIN 5
|
|
|
|
#define VM_PAGER_PUT_SYNC 0x0001
|
|
#define VM_PAGER_PUT_INVAL 0x0002
|
|
#define VM_PAGER_IGNORE_CLEANCHK 0x0004
|
|
#define VM_PAGER_CLUSTER_OK 0x0008
|
|
|
|
#ifdef _KERNEL
|
|
#ifdef MALLOC_DECLARE
|
|
MALLOC_DECLARE(M_VMPGDATA);
|
|
#endif
|
|
|
|
extern vm_map_t pager_map;
|
|
extern struct pagerops *pagertab[];
|
|
extern struct mtx pbuf_mtx;
|
|
|
|
vm_object_t vm_pager_allocate(objtype_t, void *, vm_ooffset_t, vm_prot_t, vm_ooffset_t);
|
|
void vm_pager_bufferinit(void);
|
|
void vm_pager_deallocate(vm_object_t);
|
|
static __inline int vm_pager_get_pages(vm_object_t, vm_page_t *, int, int);
|
|
static __inline boolean_t vm_pager_has_page(vm_object_t, vm_pindex_t, int *, int *);
|
|
void vm_pager_init(void);
|
|
vm_object_t vm_pager_object_lookup(struct pagerlst *, void *);
|
|
|
|
/*
|
|
* vm_page_get_pages:
|
|
*
|
|
* Retrieve pages from the VM system in order to map them into an object
|
|
* ( or into VM space somewhere ). If the pagein was successful, we
|
|
* must fully validate it.
|
|
*/
|
|
static __inline int
|
|
vm_pager_get_pages(
|
|
vm_object_t object,
|
|
vm_page_t *m,
|
|
int count,
|
|
int reqpage
|
|
) {
|
|
int r;
|
|
|
|
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
|
|
r = (*pagertab[object->type]->pgo_getpages)(object, m, count, reqpage);
|
|
if (r == VM_PAGER_OK && m[reqpage]->valid != VM_PAGE_BITS_ALL) {
|
|
vm_page_zero_invalid(m[reqpage], TRUE);
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
static __inline void
|
|
vm_pager_put_pages(
|
|
vm_object_t object,
|
|
vm_page_t *m,
|
|
int count,
|
|
int flags,
|
|
int *rtvals
|
|
) {
|
|
|
|
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
|
|
(*pagertab[object->type]->pgo_putpages)
|
|
(object, m, count, flags, rtvals);
|
|
}
|
|
|
|
/*
|
|
* vm_pager_haspage
|
|
*
|
|
* Check to see if an object's pager has the requested page. The
|
|
* object's pager will also set before and after to give the caller
|
|
* some idea of the number of pages before and after the requested
|
|
* page can be I/O'd efficiently.
|
|
*
|
|
* The object must be locked.
|
|
*/
|
|
static __inline boolean_t
|
|
vm_pager_has_page(
|
|
vm_object_t object,
|
|
vm_pindex_t offset,
|
|
int *before,
|
|
int *after
|
|
) {
|
|
boolean_t ret;
|
|
|
|
VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
|
|
ret = (*pagertab[object->type]->pgo_haspage)
|
|
(object, offset, before, after);
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* vm_pager_page_unswapped
|
|
*
|
|
* Destroy swap associated with the page.
|
|
*
|
|
* The object containing the page must be locked.
|
|
* This function may not block.
|
|
*
|
|
* XXX: A much better name would be "vm_pager_page_dirtied()"
|
|
* XXX: It is not obvious if this could be profitably used by any
|
|
* XXX: pagers besides the swap_pager or if it should even be a
|
|
* XXX: generic pager_op in the first place.
|
|
*/
|
|
static __inline void
|
|
vm_pager_page_unswapped(vm_page_t m)
|
|
{
|
|
|
|
VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
|
|
if (pagertab[m->object->type]->pgo_pageunswapped)
|
|
(*pagertab[m->object->type]->pgo_pageunswapped)(m);
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
#endif /* _VM_PAGER_ */
|