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
|
/* VTreeFS - link.c - support for symbolic links and device nodes */
#include "inc.h"
/*
* Retrieve a symbolic link target.
*/
ssize_t
fs_rdlink(ino_t ino_nr, struct fsdriver_data * data, size_t bytes)
{
char path[PATH_MAX];
struct inode *node;
size_t len;
int r;
if ((node = find_inode(ino_nr)) == NULL)
return EINVAL;
/* The hook should be provided for any FS that adds symlink inodes.. */
if (vtreefs_hooks->rdlink_hook == NULL)
return ENOSYS;
assert(!is_inode_deleted(node)); /* symlinks cannot be opened */
r = vtreefs_hooks->rdlink_hook(node, path, sizeof(path),
get_inode_cbdata(node));
if (r != OK) return r;
len = strlen(path);
assert(len > 0 && len < sizeof(path));
if (len > bytes)
len = bytes;
/* Copy out the result. */
if ((r = fsdriver_copyout(data, 0, path, len)) != OK)
return r;
return len;
}
/*
* Create a symbolic link.
*/
int
fs_slink(ino_t dir_nr, char * name, uid_t uid, gid_t gid,
struct fsdriver_data * data, size_t bytes)
{
char path[PATH_MAX];
struct inode *node;
struct inode_stat istat;
int r;
if ((node = find_inode(dir_nr)) == NULL)
return EINVAL;
if (vtreefs_hooks->slink_hook == NULL)
return ENOSYS;
if (get_inode_by_name(node, name) != NULL)
return EEXIST;
if (bytes >= sizeof(path))
return ENAMETOOLONG;
if ((r = fsdriver_copyin(data, 0, path, bytes)) != OK)
return r;
path[bytes] = 0;
memset(&istat, 0, sizeof(istat));
istat.mode = S_IFLNK | RWX_MODES;
istat.uid = uid;
istat.gid = gid;
istat.size = strlen(path);
istat.dev = 0;
return vtreefs_hooks->slink_hook(node, name, &istat, path,
get_inode_cbdata(node));
}
/*
* Create a device node.
*/
int
fs_mknod(ino_t dir_nr, char * name, mode_t mode, uid_t uid, gid_t gid,
dev_t rdev)
{
struct inode *node;
struct inode_stat istat;
if ((node = find_inode(dir_nr)) == NULL)
return EINVAL;
if (get_inode_by_name(node, name) != NULL)
return EEXIST;
if (vtreefs_hooks->mknod_hook == NULL)
return ENOSYS;
memset(&istat, 0, sizeof(istat));
istat.mode = mode;
istat.uid = uid;
istat.gid = gid;
istat.size = 0;
istat.dev = rdev;
return vtreefs_hooks->mknod_hook(node, name, &istat,
get_inode_cbdata(node));
}
/*
* Unlink a node.
*/
int
fs_unlink(ino_t dir_nr, char * name, int __unused call)
{
struct inode *dir_node, *node;
if ((dir_node = find_inode(dir_nr)) == NULL)
return EINVAL;
if ((node = get_inode_by_name(dir_node, name)) == NULL)
return ENOENT;
if (vtreefs_hooks->unlink_hook == NULL)
return ENOSYS;
return vtreefs_hooks->unlink_hook(node, get_inode_cbdata(node));
}
|
