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1.1 root 1: /*
2: * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * Portions Copyright (c) 1999 Apple Computer, Inc. All Rights
7: * Reserved. This file contains Original Code and/or Modifications of
8: * Original Code as defined in and that are subject to the Apple Public
9: * Source License Version 1.1 (the "License"). You may not use this file
10: * except in compliance with the License. Please obtain a copy of the
11: * License at http://www.apple.com/publicsource and read it before using
12: * this file.
13: *
14: * The Original Code and all software distributed under the License are
15: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
16: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
17: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
18: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
19: * License for the specific language governing rights and limitations
20: * under the License.
21: *
22: * @APPLE_LICENSE_HEADER_END@
23: */
24:
25: /*
26: * Mach Operating System
27: * Copyright (c) 1987 Carnegie-Mellon University
28: * All rights reserved. The CMU software License Agreement specifies
29: * the terms and conditions for use and redistribution.
30: */
31: /*
32: * HISTORY
33: * 3-Aug-90 Doug Mitchell at NeXT
34: * Added prototypes for exported functions.
35: *
36: * 18-Feb-90 Gregg Kellogg (gk) at NeXT
37: * Merged in with Mach 2.5 stuff.
38: *
39: * 9-Mar-88 John Seamons (jks) at NeXT
40: * Allocate vm_info structures from a zone.
41: *
42: * 11-Jun-87 William Bolosky (bolosky) at Carnegie-Mellon University
43: * Changed pager_id to pager.
44: *
45: * 30-Apr-87 Avadis Tevanian (avie) at Carnegie-Mellon University
46: * Created.
47: */
48: /*
49: * File: mapfs.h
50: * Author: Avadis Tevanian, Jr.
51: * Copyright (C) 1987, Avadis Tevanian, Jr.
52: *
53: * Header file for mapped file system support.
54: *
55: */
56:
57: #ifndef _KERN_MAPFS_H_
58: #define _KERN_MAPFS_H_
59:
60: #ifdef KERNEL_BUILD
61: #import <mach_nbc.h>
62: #endif /* KERNEL_BUILD */
63: #import <vm/vm_pager.h>
64: #import <kern/lock.h>
65: #import <kern/queue.h>
66: #import <kern/zalloc.h>
67: #import <vm/vm_object.h>
68: #import <sys/types.h>
69: #import <sys/vnode.h>
70:
71: /*
72: * Associated with each mapped file is information about its
73: * corresponding VM window. This information is kept in the following
74: * vm_info structure.
75: */
76: struct vm_info {
77: vm_pager_t pager; /* [external] pager */
78: short map_count; /* number of times mapped */
79: short use_count; /* number of times in use */
80: vm_offset_t va; /* mapped virtual address */
81: vm_size_t size; /* mapped size */
82: vm_offset_t offset; /* offset into file at va */
83: vm_size_t vnode_size; /* vnode size (not reflected in ip) */
84: struct vnode *vnode; /* vnode backpointer */
85: lock_data_t lock; /* lock for changing window */
86: vm_object_t object; /* object [for KERNEL flushing] */
87: queue_chain_t lru_links; /* lru queue links */
88: struct ucred *cred; /* vnode credentials */
89: int error; /* holds error codes */
90: u_int queued:1, /* on lru queue? */
91: dirty:1, /* range needs flushing? */
92: close_flush:1, /* flush on close */
93: invalidate:1, /* is mapping invalid? */
94: busy:1, /* are we busy conducting an uiomove */
95: delayed_fsync:1,/* need to do a push after the uiomove completes */
96: filesize:1, /* want size as reflected in ip */
97: mapped:1, /* mapped into KERNEL VM? */
98: dying:1, /* vm_info being freed */
99: nfsdirty:1; /* locally modified */
100: vm_size_t dirtysize; /* unwritten data so far */
101: vm_offset_t dirtyoffset; /* unwritten data so far */
102: };
103:
104: #define VM_INFO_NULL ((struct vm_info *) 0)
105: #if NeXT
106: #define MFS_NOFLUSH 1
107: #define MFS_NOINVALID 2
108: #endif
109:
110: extern struct zone *vm_info_zone;
111:
112: /*
113: * exported primitives for loadable file systems.
114: */
115: int vm_info_init __P((struct vnode *));
116: void vm_info_free __P((struct vnode *));
117: vm_size_t vm_get_vnode_size __P((struct vnode *));
118: void vm_set_vnode_size __P((struct vnode *, vm_size_t));
119: void vm_set_close_flush __P((struct vnode *, boolean_t));
120: void mapfs_uncache __P((struct vnode *));
121: int mapfs_trunc __P((struct vnode *, vm_offset_t));
122: int mapfs_io __P((struct vnode *, struct uio *, enum uio_rw, int, struct ucred *));
123: void vm_set_error __P((struct vnode *, int));
124: void map_vnode __P((struct vnode *, struct proc *));
125: void unmap_vnode __P((struct vnode *, struct proc *));
126: void blkflush __P((struct vnode *, daddr_t, vm_size_t));
127:
128: #ifdef KERNEL_BUILD
129: #define mfs_assert(e) assert(e)
130: #endif /* KERNEL_BUILD */
131:
132: /* defines for common checks that a file system has to perform */
133:
134: #define ISMAPFSFILE(vp) \
135: (((vp)->v_type == VREG) && \
136: ((vp)->v_vm_info) && ((vp)->v_vm_info->mapped))
137:
138: #define NOTMAPFSFILE(vp) \
139: (((vp)->v_type == VREG) && \
140: (((vp)->v_vm_info) && !((vp)->v_vm_info->mapped)))
141:
142: #endif /* _KERN_MAPFS_H_ */
143:
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