1 | /* |
2 | * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* |
29 | * Mach Operating System |
30 | * Copyright (c) 1987 Carnegie-Mellon University |
31 | * All rights reserved. The CMU software License Agreement specifies |
32 | * the terms and conditions for use and redistribution. |
33 | */ |
34 | |
35 | #ifndef _VNODE_PAGER_ |
36 | #define 1 |
37 | |
38 | #include <mach/kern_return.h> |
39 | #include <sys/types.h> |
40 | #include <kern/queue.h> |
41 | |
42 | #ifdef KERNEL |
43 | #include <mach/boolean.h> |
44 | #include <mach/memory_object_types.h> |
45 | #include <mach/vm_types.h> |
46 | #include <vm/vm_protos.h> |
47 | #include <vm/vm_pager.h> |
48 | |
49 | /* |
50 | * Vstructs are the internal (to us) description of a unit of backing store. |
51 | * The are the link between memory objects and the backing store they represent. |
52 | * For the vnode pager, backing store comes in two flavors: normal files and |
53 | * swap files. |
54 | * |
55 | * For objects that page to and from normal files (e.g. objects that represent |
56 | * program text segments), we maintain some simple parameters that allow us to |
57 | * access the file's contents directly through the vnode interface. |
58 | * |
59 | * Data for objects without associated vnodes is maintained in the swap files. |
60 | * Each object that uses one of these as backing store has a vstruct indicating |
61 | * the swap file of preference (vs_pf) and a mapping between contiguous object |
62 | * offsets and swap file offsets (vs_pmap). Each entry in this mapping specifies |
63 | * the pager file to use, and the offset of the page in that pager file. These |
64 | * mapping entries are of type pfMapEntry. |
65 | */ |
66 | |
67 | /* |
68 | * Pager file structure. One per swap file. |
69 | */ |
70 | typedef struct { |
71 | queue_chain_t ; /* link to other paging files */ |
72 | struct vnode *; /* vnode of paging file */ |
73 | u_int ; /* Number of vstruct using this file */ |
74 | u_char *; /* Map of used blocks */ |
75 | long ; /* Size of file in pages */ |
76 | long ; /* Number of unused pages */ |
77 | long ; /* Low water page */ |
78 | long ; /* Highest page allocated */ |
79 | long ; /* Lowest page unallocated */ |
80 | char *; /* Filename of this file */ |
81 | boolean_t ; |
82 | int ; /* index into the pager_file array */ |
83 | void * ; /* Lock for alloc and dealloc */ |
84 | } *; |
85 | |
86 | #define (pager_file_t) 0 |
87 | |
88 | #define 16 |
89 | |
90 | #define MAX_BACKING_STORE 100 |
91 | |
92 | struct bs_map { |
93 | struct vnode *vp; |
94 | void *bs; |
95 | }; |
96 | extern struct bs_map bs_port_table[]; |
97 | |
98 | |
99 | |
100 | /* |
101 | * Pager file data structures. |
102 | */ |
103 | #define INDEX_NULL 0 |
104 | typedef struct { |
105 | unsigned int index:8; /* paging file this block is in */ |
106 | unsigned int offset:24; /* page number where block resides */ |
107 | } pf_entry; |
108 | |
109 | typedef enum { |
110 | IS_INODE, /* Local disk */ |
111 | IS_RNODE /* NFS */ |
112 | } ; |
113 | |
114 | /* |
115 | * Basic vnode pager structure. One per object, backing-store pair. |
116 | */ |
117 | typedef struct vstruct { |
118 | boolean_t is_device; /* Must be first - see vm_pager.h */ |
119 | pager_file_t vs_pf; /* Pager file this uses */ |
120 | pf_entry **vs_pmap; /* Map of pages into paging file */ |
121 | unsigned int |
122 | /* boolean_t */ vs_swapfile:1; /* vnode is a swapfile */ |
123 | short vs_count; /* use count */ |
124 | int vs_size; /* size of this chunk in pages*/ |
125 | struct vnode *vs_vp; /* vnode to page to */ |
126 | } *; |
127 | |
128 | #define ((vnode_pager_t) 0) |
129 | |
130 | #endif /* KERNEL */ |
131 | |
132 | #endif /* _VNODE_PAGER_ */ |
133 | |