132 lines
4.7 KiB
C
132 lines
4.7 KiB
C
/*
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* Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
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*
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* This file contains Original Code and/or Modifications of Original Code
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* as defined in and that are subject to the Apple Public Source License
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* Version 2.0 (the 'License'). You may not use this file except in
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* compliance with the License. The rights granted to you under the License
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* may not be used to create, or enable the creation or redistribution of,
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* unlawful or unlicensed copies of an Apple operating system, or to
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* circumvent, violate, or enable the circumvention or violation of, any
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* terms of an Apple operating system software license agreement.
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*
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* Please obtain a copy of the License at
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* http://www.opensource.apple.com/apsl/ and read it before using this file.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
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* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
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* Please see the License for the specific language governing rights and
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* limitations under the License.
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*
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* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
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*/
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/*
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* Mach Operating System
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* Copyright (c) 1987 Carnegie-Mellon University
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* All rights reserved. The CMU software License Agreement specifies
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* the terms and conditions for use and redistribution.
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*/
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#ifndef _VNODE_PAGER_
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#define _VNODE_PAGER_ 1
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#include <mach/kern_return.h>
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#include <sys/types.h>
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#include <kern/queue.h>
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#ifdef KERNEL
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#include <mach/boolean.h>
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#include <mach/memory_object_types.h>
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#include <mach/vm_types.h>
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#include <vm/vm_protos.h>
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#include <vm/vm_pager.h>
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/*
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* Vstructs are the internal (to us) description of a unit of backing store.
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* The are the link between memory objects and the backing store they represent.
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* For the vnode pager, backing store comes in two flavors: normal files and
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* swap files.
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*
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* For objects that page to and from normal files (e.g. objects that represent
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* program text segments), we maintain some simple parameters that allow us to
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* access the file's contents directly through the vnode interface.
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*
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* Data for objects without associated vnodes is maintained in the swap files.
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* Each object that uses one of these as backing store has a vstruct indicating
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* the swap file of preference (vs_pf) and a mapping between contiguous object
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* offsets and swap file offsets (vs_pmap). Each entry in this mapping specifies
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* the pager file to use, and the offset of the page in that pager file. These
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* mapping entries are of type pfMapEntry.
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*/
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/*
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* Pager file structure. One per swap file.
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*/
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typedef struct pager_file {
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queue_chain_t pf_chain; /* link to other paging files */
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struct vnode *pf_vp; /* vnode of paging file */
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u_int pf_count; /* Number of vstruct using this file */
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u_char *pf_bmap; /* Map of used blocks */
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long pf_npgs; /* Size of file in pages */
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long pf_pfree; /* Number of unused pages */
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long pf_lowat; /* Low water page */
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long pf_hipage; /* Highest page allocated */
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long pf_hint; /* Lowest page unallocated */
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char *pf_name; /* Filename of this file */
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boolean_t pf_prefer;
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int pf_index; /* index into the pager_file array */
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void * pf_lock; /* Lock for alloc and dealloc */
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} *pager_file_t;
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#define PAGER_FILE_NULL (pager_file_t) 0
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#define MAXPAGERFILES 16
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#define MAX_BACKING_STORE 100
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struct bs_map {
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struct vnode *vp;
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void *bs;
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};
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extern struct bs_map bs_port_table[];
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/*
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* Pager file data structures.
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*/
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#define INDEX_NULL 0
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typedef struct {
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unsigned int index:8; /* paging file this block is in */
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unsigned int offset:24; /* page number where block resides */
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} pf_entry;
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typedef enum {
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IS_INODE, /* Local disk */
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IS_RNODE /* NFS */
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} vpager_fstype;
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/*
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* Basic vnode pager structure. One per object, backing-store pair.
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*/
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typedef struct vstruct {
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boolean_t is_device; /* Must be first - see vm_pager.h */
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pager_file_t vs_pf; /* Pager file this uses */
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pf_entry **vs_pmap; /* Map of pages into paging file */
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unsigned int
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/* boolean_t */ vs_swapfile:1; /* vnode is a swapfile */
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short vs_count; /* use count */
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int vs_size; /* size of this chunk in pages*/
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struct vnode *vs_vp; /* vnode to page to */
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} *vnode_pager_t;
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#define VNODE_PAGER_NULL ((vnode_pager_t) 0)
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#endif /* KERNEL */
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#endif /* _VNODE_PAGER_ */
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