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
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
#include <camellia/errno.h>
#include <kernel/arch/amd64/driver/util.h> // portable despite the name
#include <kernel/malloc.h>
#include <kernel/panic.h>
#include <kernel/proc.h>
#include <kernel/vfs/procfs.h>
#include <kernel/vfs/request.h>
#include <shared/mem.h>
enum phandle_type {
PhRoot,
PhDir,
PhIntr,
PhMem,
};
struct phandle {
uint32_t gid;
enum phandle_type type;
};
static struct phandle *openpath(const char *path, size_t len, Proc *root);
static Proc *findgid(uint32_t gid, Proc *root);
static void procfs_accept(VfsReq *req);
static void procfs_cleanup(VfsBackend *be);
static int isdigit(int c);
static struct phandle *
openpath(const char *path, size_t len, Proc *root)
{
struct phandle *h;
enum phandle_type type;
uint32_t gid = 0;
if (len == 0) return NULL;
path++, len--;
if (len == 0) {
type = PhRoot;
} else if (isdigit(*path)) {
Proc *p;
uint32_t lid = 0;
for (; 0 < len && *path != '/'; path++, len--) {
if (!isdigit(*path)) {
return NULL;
}
lid = lid * 10 + *path - '0';
}
if (len == 0) {
return NULL;
}
assert(*path == '/');
path++, len--;
if (len == 0) {
type = PhDir;
} else if (len == 4 && memcmp(path, "intr", 4) == 0) {
type = PhIntr;
} else if (len == 3 && memcmp(path, "mem", 3) == 0) {
type = PhMem;
} else {
return NULL;
}
p = proc_ns_byid(root, lid);
if (!p) {
return NULL;
}
gid = p->globalid;
} else {
return NULL;
}
h = kmalloc(sizeof *h);
h->gid = gid;
h->type = type;
return h;
}
static Proc *
findgid(uint32_t gid, Proc *root)
{
for (Proc *p = root; p; p = proc_next(p, root)) {
if (p->globalid == gid) return p;
}
return NULL;
}
static void
procfs_accept(VfsReq *req)
{
Proc *root = req->backend->kern.data;
struct phandle *h = (__force void*)req->id;
Proc *p;
char buf[512];
assert(root);
assert(root->pns == root);
if (req->type == VFSOP_OPEN) {
assert(req->input.kern);
h = openpath(req->input.buf_kern, req->input.len, root);
vfsreq_finish_short(req, h ? (long)h : -ENOENT);
return;
} else if (req->type == VFSOP_CLOSE) {
assert(h);
kfree(h);
vfsreq_finish_short(req, 0);
return;
} else {
assert(h);
}
if (h->type != PhRoot) {
p = findgid(h->gid, root);
if (!p) {
vfsreq_finish_short(req, -ENOENT);
return;
}
}
if (req->type == VFSOP_READ && (h->type == PhDir || h->type == PhRoot)) {
// TODO port dirbuild to kernel
int pos = 0;
if (h->type == PhDir) {
pos += snprintf(buf + pos, 512 - pos, "intr")+1;
pos += snprintf(buf + pos, 512 - pos, "mem")+1;
} else {
for (Proc *it = root; it; it = proc_ns_next(root, it)) {
assert(pos < 512);
pos += snprintf(buf + pos, 512 - pos, "%d/", proc_ns_id(root, it)) + 1;
if (512 <= pos) {
vfsreq_finish_short(req, -EGENERIC);
}
}
}
assert(0 <= pos && (size_t)pos <= sizeof buf);
vfsreq_finish_short(req, req_readcopy(req, buf, pos));
} else if (req->type == VFSOP_READ && h->type == PhMem) {
if (p->pages == NULL || req->caller->pages == NULL) {
vfsreq_finish_short(req, 0);
return;
}
size_t res = pcpy_bi(
req->caller, req->output.buf,
p, (__user void*)req->offset,
req->output.len
);
vfsreq_finish_short(req, res);
} else if (req->type == VFSOP_WRITE && h->type == PhIntr) {
proc_intr(p);
vfsreq_finish_short(req, req->input.len);
} else {
vfsreq_finish_short(req, -ENOSYS);
}
}
static void
procfs_cleanup(VfsBackend *be)
{
Proc *p = be->kern.data;
assert(p);
p->refcount--;
}
static int
isdigit(int c) {
return '0' <= c && c <= '9';
}
VfsBackend *
procfs_backend(Proc *proc)
{
VfsBackend *be = kzalloc(sizeof(VfsBackend));
*be = (VfsBackend) {
.is_user = false,
.provhcnt = 1,
.usehcnt = 1,
.kern.accept = procfs_accept,
.kern.data = proc,
.kern.cleanup = procfs_cleanup,
};
proc->refcount++;
assert(proc->refcount); /* overflow */
return be;
}
|
