1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
|
/*
* Copyright (c) 2023-2024 Ian Marco Moffett and the Osmora Team.
* 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. Neither the name of Hyra 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 COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
*/
#include <sys/vnode.h>
#include <sys/errno.h>
#include <sys/mount.h>
#include <sys/syslog.h>
#include <vm/dynalloc.h>
#include <string.h>
mountlist_t g_mountlist;
int
vfs_alloc_vnode(struct vnode **res, int type)
{
struct vnode *vp = dynalloc(sizeof(struct vnode));
if (vp == NULL) {
return -ENOMEM;
}
memset(vp, 0, sizeof(*vp));
vp->type = type;
vp->refcount = 1;
*res = vp;
return 0;
}
/*
* Allocate a mount structure.
*
* @vp: Vnode this mount structure covers.
* @fip: File system information.
*/
struct mount *
vfs_alloc_mount(struct vnode *vp, struct fs_info *fip)
{
struct mount *mp;
mp = dynalloc(sizeof(*mp));
if (mp == NULL)
return NULL;
memset(mp, 0, sizeof(*mp));
mp->vp = vp;
mp->mnt_ops = fip->vfsops;
return mp;
}
/*
* Release a vnode and its resources from
* memory.
*/
int
vfs_release_vnode(struct vnode *vp)
{
const struct vops *vops = vp->vops;
int status = 0;
if (vp == NULL)
return -EINVAL;
/*
* The refcount cannot be zero before we decrement it,
* something is quite wrong if this happens.
*/
if (vp->refcount == 0) {
kprintf("Cannot release vnode, bad refcount\n");
return -EIO;
}
/*
* Drop the reference and don't destroy the vnode
* if it's still not zero.
*/
if (atomic_dec_int(&vp->refcount) > 0)
return 0;
if (vops->reclaim != NULL)
status = vops->reclaim(vp);
if (status != 0)
return status;
dynfree(vp);
return status;
}
int
vfs_vop_lookup(struct vnode *vp, struct vop_lookup_args *args)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->lookup == NULL)
return -EIO;
return vops->lookup(args);
}
int
vfs_vop_read(struct vnode *vp, struct sio_txn *sio)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->read == NULL)
return -EIO;
return vops->read(vp, sio);
}
int
vfs_vop_getattr(struct vnode *vp, struct vop_getattr_args *args)
{
const struct vops *vops = vp->vops;
if (vops == NULL)
return -EIO;
if (vops->getattr == NULL)
return -EIO;
return vops->getattr(args);
}
|
