This source file includes following definitions.
- proc_put_inode
- proc_put_super
- parse_options
- proc_read_super
- proc_statfs
- proc_read_inode
- proc_write_inode
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7 #include <linux/sched.h>
8 #include <linux/proc_fs.h>
9 #include <linux/kernel.h>
10 #include <linux/mm.h>
11 #include <linux/string.h>
12 #include <linux/stat.h>
13 #include <linux/locks.h>
14 #include <linux/limits.h>
15 #include <linux/config.h>
16
17 #include <asm/system.h>
18 #include <asm/segment.h>
19
20 extern unsigned long prof_len;
21
22 void proc_put_inode(struct inode *inode)
23 {
24 if (inode->i_nlink)
25 return;
26 inode->i_size = 0;
27 }
28
29 void proc_put_super(struct super_block *sb)
30 {
31 lock_super(sb);
32 sb->s_dev = 0;
33 unlock_super(sb);
34 }
35
36 static struct super_operations proc_sops = {
37 proc_read_inode,
38 NULL,
39 proc_write_inode,
40 proc_put_inode,
41 proc_put_super,
42 NULL,
43 proc_statfs,
44 NULL
45 };
46
47
48 static int parse_options(char *options,uid_t *uid,gid_t *gid)
49 {
50 char *this_char,*value;
51
52 *uid = current->uid;
53 *gid = current->gid;
54 if (!options) return 1;
55 for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
56 if ((value = strchr(this_char,'=')) != NULL)
57 *value++ = 0;
58 if (!strcmp(this_char,"uid")) {
59 if (!value || !*value)
60 return 0;
61 *uid = simple_strtoul(value,&value,0);
62 if (*value)
63 return 0;
64 }
65 else if (!strcmp(this_char,"gid")) {
66 if (!value || !*value)
67 return 0;
68 *gid = simple_strtoul(value,&value,0);
69 if (*value)
70 return 0;
71 }
72 else return 0;
73 }
74 return 1;
75 }
76
77
78 struct super_block *proc_read_super(struct super_block *s,void *data,
79 int silent)
80 {
81 lock_super(s);
82 s->s_blocksize = 1024;
83 s->s_blocksize_bits = 10;
84 s->s_magic = PROC_SUPER_MAGIC;
85 s->s_op = &proc_sops;
86 unlock_super(s);
87 if (!(s->s_mounted = iget(s,PROC_ROOT_INO))) {
88 s->s_dev = 0;
89 printk("get root inode failed\n");
90 return NULL;
91 }
92 parse_options(data, &s->s_mounted->i_uid, &s->s_mounted->i_gid);
93 return s;
94 }
95
96 void proc_statfs(struct super_block *sb, struct statfs *buf, int bufsiz)
97 {
98 struct statfs tmp;
99
100 tmp.f_type = PROC_SUPER_MAGIC;
101 tmp.f_bsize = PAGE_SIZE/sizeof(long);
102 tmp.f_blocks = 0;
103 tmp.f_bfree = 0;
104 tmp.f_bavail = 0;
105 tmp.f_files = 0;
106 tmp.f_ffree = 0;
107 tmp.f_namelen = NAME_MAX;
108 memcpy_tofs(buf, &tmp, bufsiz);
109 }
110
111 void proc_read_inode(struct inode * inode)
112 {
113 unsigned long ino, pid;
114 struct task_struct * p;
115 int i;
116
117 inode->i_op = NULL;
118 inode->i_mode = 0;
119 inode->i_uid = 0;
120 inode->i_gid = 0;
121 inode->i_nlink = 1;
122 inode->i_size = 0;
123 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
124 inode->i_blocks = 0;
125 inode->i_blksize = 1024;
126 ino = inode->i_ino;
127 pid = ino >> 16;
128 p = task[0];
129 for (i = 0; i < NR_TASKS ; i++)
130 if ((p = task[i]) && (p->pid == pid))
131 break;
132 if (!p || i >= NR_TASKS)
133 return;
134 if (ino == PROC_ROOT_INO) {
135 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
136 inode->i_nlink = 2;
137 for (i = 1 ; i < NR_TASKS ; i++)
138 if (task[i])
139 inode->i_nlink++;
140 inode->i_op = &proc_root_inode_operations;
141 return;
142 }
143
144 #ifdef CONFIG_IP_ACCT
145
146 if (ino == PROC_NET_IPACCT) {
147 inode->i_mode = S_IFREG | S_IRUGO | S_IWUSR;
148 inode->i_op = &proc_net_inode_operations;
149 return;
150 }
151 #endif
152 #ifdef CONFIG_IP_FIREWALL
153
154 if ((ino == PROC_NET_IPFWFWD) || (ino == PROC_NET_IPFWBLK)) {
155 inode->i_mode = S_IFREG | S_IRUGO | S_IWUSR;
156 inode->i_op = &proc_net_inode_operations;
157 return;
158 }
159 #endif
160
161
162 if ((ino >= PROC_NET_UNIX) && (ino < PROC_NET_LAST)) {
163 inode->i_mode = S_IFREG | S_IRUGO;
164 inode->i_op = &proc_net_inode_operations;
165 return;
166 }
167
168 if (!pid) {
169 switch (ino) {
170 case PROC_KMSG:
171 inode->i_mode = S_IFREG | S_IRUSR;
172 inode->i_op = &proc_kmsg_inode_operations;
173 break;
174 case PROC_NET:
175 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
176 inode->i_nlink = 2;
177 inode->i_op = &proc_net_inode_operations;
178 break;
179 case PROC_KCORE:
180 inode->i_mode = S_IFREG | S_IRUSR;
181 inode->i_op = &proc_kcore_inode_operations;
182 inode->i_size = high_memory + PAGE_SIZE;
183 break;
184 #ifdef CONFIG_PROFILE
185 case PROC_PROFILE:
186 inode->i_mode = S_IFREG | S_IRUGO | S_IWUSR;
187 inode->i_op = &proc_profile_inode_operations;
188 inode->i_size = (1+prof_len) * sizeof(unsigned long);
189 break;
190 #endif
191 default:
192 inode->i_mode = S_IFREG | S_IRUGO;
193 inode->i_op = &proc_array_inode_operations;
194 break;
195 }
196 return;
197 }
198 ino &= 0x0000ffff;
199 if (p->dumpable) {
200 inode->i_uid = p->uid;
201 inode->i_gid = p->gid;
202 }
203 switch (ino) {
204 case PROC_PID_INO:
205 inode->i_nlink = 4;
206 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
207 inode->i_op = &proc_base_inode_operations;
208 return;
209 case PROC_PID_MEM:
210 inode->i_op = &proc_mem_inode_operations;
211 inode->i_mode = S_IFREG | S_IRUSR | S_IWUSR;
212 return;
213 case PROC_PID_CWD:
214 case PROC_PID_ROOT:
215 case PROC_PID_EXE:
216 inode->i_op = &proc_link_inode_operations;
217 inode->i_size = 64;
218 inode->i_mode = S_IFLNK | S_IRWXU;
219 return;
220 case PROC_PID_FD:
221 inode->i_mode = S_IFDIR | S_IRUSR | S_IXUSR;
222 inode->i_op = &proc_fd_inode_operations;
223 inode->i_nlink = 2;
224 return;
225 case PROC_PID_ENVIRON:
226 inode->i_mode = S_IFREG | S_IRUSR;
227 inode->i_op = &proc_array_inode_operations;
228 return;
229 case PROC_PID_CMDLINE:
230 case PROC_PID_STAT:
231 case PROC_PID_STATM:
232 inode->i_mode = S_IFREG | S_IRUGO;
233 inode->i_op = &proc_array_inode_operations;
234 return;
235 case PROC_PID_MAPS:
236 inode->i_mode = S_IFIFO | S_IRUGO;
237 inode->i_op = &proc_arraylong_inode_operations;
238 return;
239 }
240 switch (ino >> 8) {
241 case PROC_PID_FD_DIR:
242 ino &= 0xff;
243 if (ino >= NR_OPEN || !p->files->fd[ino])
244 return;
245 inode->i_op = &proc_link_inode_operations;
246 inode->i_size = 64;
247 inode->i_mode = S_IFLNK;
248 if (p->files->fd[ino]->f_mode & 1)
249 inode->i_mode |= S_IRUSR | S_IXUSR;
250 if (p->files->fd[ino]->f_mode & 2)
251 inode->i_mode |= S_IWUSR | S_IXUSR;
252 return;
253 }
254 return;
255 }
256
257 void proc_write_inode(struct inode * inode)
258 {
259 inode->i_dirt=0;
260 }