Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/proc/inode.c | |
3 | * | |
4 | * Copyright (C) 1991, 1992 Linus Torvalds | |
5 | */ | |
6 | ||
7 | #include <linux/time.h> | |
8 | #include <linux/proc_fs.h> | |
9 | #include <linux/kernel.h> | |
97412950 | 10 | #include <linux/pid_namespace.h> |
1da177e4 LT |
11 | #include <linux/mm.h> |
12 | #include <linux/string.h> | |
13 | #include <linux/stat.h> | |
786d7e16 | 14 | #include <linux/completion.h> |
dd23aae4 | 15 | #include <linux/poll.h> |
87ebdc00 | 16 | #include <linux/printk.h> |
1da177e4 LT |
17 | #include <linux/file.h> |
18 | #include <linux/limits.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/module.h> | |
9043476f | 21 | #include <linux/sysctl.h> |
97412950 | 22 | #include <linux/seq_file.h> |
5a0e3ad6 | 23 | #include <linux/slab.h> |
97412950 | 24 | #include <linux/mount.h> |
303eb7e2 | 25 | #include <linux/magic.h> |
1da177e4 | 26 | |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
1da177e4 | 28 | |
fee781e6 | 29 | #include "internal.h" |
1da177e4 | 30 | |
8267952b | 31 | static void proc_evict_inode(struct inode *inode) |
1da177e4 LT |
32 | { |
33 | struct proc_dir_entry *de; | |
dfef6dcd | 34 | struct ctl_table_header *head; |
1da177e4 | 35 | |
91b0abe3 | 36 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 37 | clear_inode(inode); |
fef26658 | 38 | |
99f89551 | 39 | /* Stop tracking associated processes */ |
13b41b09 | 40 | put_pid(PROC_I(inode)->pid); |
1da177e4 LT |
41 | |
42 | /* Let go of any associated proc directory entry */ | |
6bee55f9 | 43 | de = PDE(inode); |
99b76233 | 44 | if (de) |
135d5655 | 45 | pde_put(de); |
dfef6dcd AV |
46 | head = PROC_I(inode)->sysctl; |
47 | if (head) { | |
1c44dbc8 | 48 | RCU_INIT_POINTER(PROC_I(inode)->sysctl, NULL); |
dfef6dcd AV |
49 | sysctl_head_put(head); |
50 | } | |
1da177e4 LT |
51 | } |
52 | ||
e18b890b | 53 | static struct kmem_cache * proc_inode_cachep; |
1da177e4 LT |
54 | |
55 | static struct inode *proc_alloc_inode(struct super_block *sb) | |
56 | { | |
57 | struct proc_inode *ei; | |
58 | struct inode *inode; | |
59 | ||
e94b1766 | 60 | ei = (struct proc_inode *)kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
61 | if (!ei) |
62 | return NULL; | |
13b41b09 | 63 | ei->pid = NULL; |
aed7a6c4 | 64 | ei->fd = 0; |
1da177e4 LT |
65 | ei->op.proc_get_link = NULL; |
66 | ei->pde = NULL; | |
9043476f AV |
67 | ei->sysctl = NULL; |
68 | ei->sysctl_entry = NULL; | |
3d3d35b1 | 69 | ei->ns_ops = NULL; |
1da177e4 | 70 | inode = &ei->vfs_inode; |
1da177e4 LT |
71 | return inode; |
72 | } | |
73 | ||
fa0d7e3d | 74 | static void proc_i_callback(struct rcu_head *head) |
1da177e4 | 75 | { |
fa0d7e3d | 76 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
77 | kmem_cache_free(proc_inode_cachep, PROC_I(inode)); |
78 | } | |
79 | ||
fa0d7e3d NP |
80 | static void proc_destroy_inode(struct inode *inode) |
81 | { | |
82 | call_rcu(&inode->i_rcu, proc_i_callback); | |
83 | } | |
84 | ||
51cc5068 | 85 | static void init_once(void *foo) |
1da177e4 LT |
86 | { |
87 | struct proc_inode *ei = (struct proc_inode *) foo; | |
88 | ||
a35afb83 | 89 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 90 | } |
20c2df83 | 91 | |
5bcd7ff9 | 92 | void __init proc_init_inodecache(void) |
1da177e4 LT |
93 | { |
94 | proc_inode_cachep = kmem_cache_create("proc_inode_cache", | |
95 | sizeof(struct proc_inode), | |
fffb60f9 | 96 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 VD |
97 | SLAB_MEM_SPREAD|SLAB_ACCOUNT| |
98 | SLAB_PANIC), | |
20c2df83 | 99 | init_once); |
1da177e4 LT |
100 | } |
101 | ||
97412950 VK |
102 | static int proc_show_options(struct seq_file *seq, struct dentry *root) |
103 | { | |
0499680a VK |
104 | struct super_block *sb = root->d_sb; |
105 | struct pid_namespace *pid = sb->s_fs_info; | |
106 | ||
dcb0f222 EB |
107 | if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID)) |
108 | seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid)); | |
0499680a VK |
109 | if (pid->hide_pid != 0) |
110 | seq_printf(seq, ",hidepid=%u", pid->hide_pid); | |
111 | ||
97412950 VK |
112 | return 0; |
113 | } | |
114 | ||
ee9b6d61 | 115 | static const struct super_operations proc_sops = { |
1da177e4 LT |
116 | .alloc_inode = proc_alloc_inode, |
117 | .destroy_inode = proc_destroy_inode, | |
1da177e4 | 118 | .drop_inode = generic_delete_inode, |
8267952b | 119 | .evict_inode = proc_evict_inode, |
1da177e4 | 120 | .statfs = simple_statfs, |
97412950 VK |
121 | .remount_fs = proc_remount, |
122 | .show_options = proc_show_options, | |
1da177e4 LT |
123 | }; |
124 | ||
866ad9a7 AV |
125 | enum {BIAS = -1U<<31}; |
126 | ||
127 | static inline int use_pde(struct proc_dir_entry *pde) | |
128 | { | |
05c0ae21 | 129 | return atomic_inc_unless_negative(&pde->in_use); |
881adb85 AD |
130 | } |
131 | ||
866ad9a7 | 132 | static void unuse_pde(struct proc_dir_entry *pde) |
881adb85 | 133 | { |
05c0ae21 AV |
134 | if (atomic_dec_return(&pde->in_use) == BIAS) |
135 | complete(pde->pde_unload_completion); | |
786d7e16 AD |
136 | } |
137 | ||
ca469f35 AV |
138 | /* pde is locked */ |
139 | static void close_pdeo(struct proc_dir_entry *pde, struct pde_opener *pdeo) | |
140 | { | |
492b2da6 AD |
141 | /* |
142 | * close() (proc_reg_release()) can't delete an entry and proceed: | |
143 | * ->release hook needs to be available at the right moment. | |
144 | * | |
145 | * rmmod (remove_proc_entry() et al) can't delete an entry and proceed: | |
146 | * "struct file" needs to be available at the right moment. | |
147 | * | |
148 | * Therefore, first process to enter this function does ->release() and | |
149 | * signals its completion to the other process which does nothing. | |
150 | */ | |
05c0ae21 | 151 | if (pdeo->closing) { |
ca469f35 | 152 | /* somebody else is doing that, just wait */ |
05c0ae21 AV |
153 | DECLARE_COMPLETION_ONSTACK(c); |
154 | pdeo->c = &c; | |
ca469f35 | 155 | spin_unlock(&pde->pde_unload_lock); |
05c0ae21 | 156 | wait_for_completion(&c); |
ca469f35 | 157 | spin_lock(&pde->pde_unload_lock); |
ca469f35 AV |
158 | } else { |
159 | struct file *file; | |
f5887c71 | 160 | pdeo->closing = true; |
ca469f35 AV |
161 | spin_unlock(&pde->pde_unload_lock); |
162 | file = pdeo->file; | |
163 | pde->proc_fops->release(file_inode(file), file); | |
164 | spin_lock(&pde->pde_unload_lock); | |
492b2da6 | 165 | /* After ->release. */ |
06a0c417 | 166 | list_del(&pdeo->lh); |
05c0ae21 AV |
167 | if (pdeo->c) |
168 | complete(pdeo->c); | |
ca469f35 | 169 | kfree(pdeo); |
05c0ae21 | 170 | } |
ca469f35 AV |
171 | } |
172 | ||
866ad9a7 | 173 | void proc_entry_rundown(struct proc_dir_entry *de) |
786d7e16 | 174 | { |
05c0ae21 | 175 | DECLARE_COMPLETION_ONSTACK(c); |
866ad9a7 | 176 | /* Wait until all existing callers into module are done. */ |
05c0ae21 AV |
177 | de->pde_unload_completion = &c; |
178 | if (atomic_add_return(BIAS, &de->in_use) != BIAS) | |
179 | wait_for_completion(&c); | |
786d7e16 | 180 | |
492b2da6 AD |
181 | /* ->pde_openers list can't grow from now on. */ |
182 | ||
05c0ae21 | 183 | spin_lock(&de->pde_unload_lock); |
866ad9a7 AV |
184 | while (!list_empty(&de->pde_openers)) { |
185 | struct pde_opener *pdeo; | |
866ad9a7 | 186 | pdeo = list_first_entry(&de->pde_openers, struct pde_opener, lh); |
ca469f35 | 187 | close_pdeo(de, pdeo); |
866ad9a7 AV |
188 | } |
189 | spin_unlock(&de->pde_unload_lock); | |
786d7e16 AD |
190 | } |
191 | ||
866ad9a7 AV |
192 | static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence) |
193 | { | |
194 | struct proc_dir_entry *pde = PDE(file_inode(file)); | |
195 | loff_t rv = -EINVAL; | |
196 | if (use_pde(pde)) { | |
197 | loff_t (*llseek)(struct file *, loff_t, int); | |
198 | llseek = pde->proc_fops->llseek; | |
199 | if (!llseek) | |
200 | llseek = default_llseek; | |
201 | rv = llseek(file, offset, whence); | |
202 | unuse_pde(pde); | |
203 | } | |
786d7e16 AD |
204 | return rv; |
205 | } | |
206 | ||
866ad9a7 | 207 | static ssize_t proc_reg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
786d7e16 | 208 | { |
866ad9a7 | 209 | ssize_t (*read)(struct file *, char __user *, size_t, loff_t *); |
496ad9aa | 210 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 211 | ssize_t rv = -EIO; |
866ad9a7 AV |
212 | if (use_pde(pde)) { |
213 | read = pde->proc_fops->read; | |
214 | if (read) | |
215 | rv = read(file, buf, count, ppos); | |
216 | unuse_pde(pde); | |
786d7e16 | 217 | } |
866ad9a7 AV |
218 | return rv; |
219 | } | |
786d7e16 | 220 | |
866ad9a7 AV |
221 | static ssize_t proc_reg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
222 | { | |
223 | ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *); | |
224 | struct proc_dir_entry *pde = PDE(file_inode(file)); | |
225 | ssize_t rv = -EIO; | |
226 | if (use_pde(pde)) { | |
227 | write = pde->proc_fops->write; | |
228 | if (write) | |
229 | rv = write(file, buf, count, ppos); | |
230 | unuse_pde(pde); | |
231 | } | |
786d7e16 AD |
232 | return rv; |
233 | } | |
234 | ||
235 | static unsigned int proc_reg_poll(struct file *file, struct poll_table_struct *pts) | |
236 | { | |
496ad9aa | 237 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
dd23aae4 | 238 | unsigned int rv = DEFAULT_POLLMASK; |
786d7e16 | 239 | unsigned int (*poll)(struct file *, struct poll_table_struct *); |
866ad9a7 AV |
240 | if (use_pde(pde)) { |
241 | poll = pde->proc_fops->poll; | |
242 | if (poll) | |
243 | rv = poll(file, pts); | |
244 | unuse_pde(pde); | |
786d7e16 | 245 | } |
786d7e16 AD |
246 | return rv; |
247 | } | |
248 | ||
249 | static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
250 | { | |
496ad9aa | 251 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 252 | long rv = -ENOTTY; |
b19dd42f | 253 | long (*ioctl)(struct file *, unsigned int, unsigned long); |
866ad9a7 AV |
254 | if (use_pde(pde)) { |
255 | ioctl = pde->proc_fops->unlocked_ioctl; | |
256 | if (ioctl) | |
257 | rv = ioctl(file, cmd, arg); | |
258 | unuse_pde(pde); | |
786d7e16 | 259 | } |
786d7e16 AD |
260 | return rv; |
261 | } | |
262 | ||
263 | #ifdef CONFIG_COMPAT | |
264 | static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
265 | { | |
496ad9aa | 266 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 AD |
267 | long rv = -ENOTTY; |
268 | long (*compat_ioctl)(struct file *, unsigned int, unsigned long); | |
866ad9a7 AV |
269 | if (use_pde(pde)) { |
270 | compat_ioctl = pde->proc_fops->compat_ioctl; | |
271 | if (compat_ioctl) | |
272 | rv = compat_ioctl(file, cmd, arg); | |
273 | unuse_pde(pde); | |
786d7e16 | 274 | } |
786d7e16 AD |
275 | return rv; |
276 | } | |
277 | #endif | |
278 | ||
279 | static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma) | |
280 | { | |
496ad9aa | 281 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 AD |
282 | int rv = -EIO; |
283 | int (*mmap)(struct file *, struct vm_area_struct *); | |
866ad9a7 AV |
284 | if (use_pde(pde)) { |
285 | mmap = pde->proc_fops->mmap; | |
286 | if (mmap) | |
287 | rv = mmap(file, vma); | |
288 | unuse_pde(pde); | |
786d7e16 | 289 | } |
786d7e16 AD |
290 | return rv; |
291 | } | |
292 | ||
5721cf84 HD |
293 | static unsigned long |
294 | proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr, | |
295 | unsigned long len, unsigned long pgoff, | |
296 | unsigned long flags) | |
c4fe2448 AD |
297 | { |
298 | struct proc_dir_entry *pde = PDE(file_inode(file)); | |
2cbe3b0a | 299 | unsigned long rv = -EIO; |
ae5758a1 | 300 | |
c4fe2448 | 301 | if (use_pde(pde)) { |
ae5758a1 JB |
302 | typeof(proc_reg_get_unmapped_area) *get_area; |
303 | ||
304 | get_area = pde->proc_fops->get_unmapped_area; | |
fad1a86e | 305 | #ifdef CONFIG_MMU |
ae5758a1 JB |
306 | if (!get_area) |
307 | get_area = current->mm->get_unmapped_area; | |
fad1a86e | 308 | #endif |
ae5758a1 | 309 | |
5721cf84 HD |
310 | if (get_area) |
311 | rv = get_area(file, orig_addr, len, pgoff, flags); | |
ae5758a1 JB |
312 | else |
313 | rv = orig_addr; | |
c4fe2448 AD |
314 | unuse_pde(pde); |
315 | } | |
316 | return rv; | |
317 | } | |
318 | ||
786d7e16 AD |
319 | static int proc_reg_open(struct inode *inode, struct file *file) |
320 | { | |
321 | struct proc_dir_entry *pde = PDE(inode); | |
322 | int rv = 0; | |
323 | int (*open)(struct inode *, struct file *); | |
881adb85 AD |
324 | int (*release)(struct inode *, struct file *); |
325 | struct pde_opener *pdeo; | |
326 | ||
327 | /* | |
492b2da6 AD |
328 | * Ensure that |
329 | * 1) PDE's ->release hook will be called no matter what | |
330 | * either normally by close()/->release, or forcefully by | |
331 | * rmmod/remove_proc_entry. | |
332 | * | |
333 | * 2) rmmod isn't blocked by opening file in /proc and sitting on | |
334 | * the descriptor (including "rmmod foo </proc/foo" scenario). | |
881adb85 | 335 | * |
492b2da6 | 336 | * Save every "struct file" with custom ->release hook. |
881adb85 | 337 | */ |
39a10ac2 | 338 | pdeo = kmalloc(sizeof(struct pde_opener), GFP_KERNEL); |
881adb85 AD |
339 | if (!pdeo) |
340 | return -ENOMEM; | |
786d7e16 | 341 | |
866ad9a7 | 342 | if (!use_pde(pde)) { |
881adb85 | 343 | kfree(pdeo); |
d2857e79 | 344 | return -ENOENT; |
786d7e16 | 345 | } |
786d7e16 | 346 | open = pde->proc_fops->open; |
881adb85 | 347 | release = pde->proc_fops->release; |
786d7e16 AD |
348 | |
349 | if (open) | |
350 | rv = open(inode, file); | |
351 | ||
881adb85 AD |
352 | if (rv == 0 && release) { |
353 | /* To know what to release. */ | |
881adb85 | 354 | pdeo->file = file; |
39a10ac2 AD |
355 | pdeo->closing = false; |
356 | pdeo->c = NULL; | |
05c0ae21 | 357 | spin_lock(&pde->pde_unload_lock); |
881adb85 | 358 | list_add(&pdeo->lh, &pde->pde_openers); |
05c0ae21 | 359 | spin_unlock(&pde->pde_unload_lock); |
881adb85 AD |
360 | } else |
361 | kfree(pdeo); | |
05c0ae21 AV |
362 | |
363 | unuse_pde(pde); | |
786d7e16 AD |
364 | return rv; |
365 | } | |
366 | ||
367 | static int proc_reg_release(struct inode *inode, struct file *file) | |
368 | { | |
369 | struct proc_dir_entry *pde = PDE(inode); | |
881adb85 | 370 | struct pde_opener *pdeo; |
786d7e16 | 371 | spin_lock(&pde->pde_unload_lock); |
ca469f35 AV |
372 | list_for_each_entry(pdeo, &pde->pde_openers, lh) { |
373 | if (pdeo->file == file) { | |
374 | close_pdeo(pde, pdeo); | |
375 | break; | |
376 | } | |
881adb85 | 377 | } |
786d7e16 | 378 | spin_unlock(&pde->pde_unload_lock); |
ca469f35 | 379 | return 0; |
786d7e16 AD |
380 | } |
381 | ||
382 | static const struct file_operations proc_reg_file_ops = { | |
383 | .llseek = proc_reg_llseek, | |
384 | .read = proc_reg_read, | |
385 | .write = proc_reg_write, | |
386 | .poll = proc_reg_poll, | |
387 | .unlocked_ioctl = proc_reg_unlocked_ioctl, | |
388 | #ifdef CONFIG_COMPAT | |
389 | .compat_ioctl = proc_reg_compat_ioctl, | |
390 | #endif | |
391 | .mmap = proc_reg_mmap, | |
c4fe2448 | 392 | .get_unmapped_area = proc_reg_get_unmapped_area, |
786d7e16 AD |
393 | .open = proc_reg_open, |
394 | .release = proc_reg_release, | |
395 | }; | |
396 | ||
778f3dd5 DM |
397 | #ifdef CONFIG_COMPAT |
398 | static const struct file_operations proc_reg_file_ops_no_compat = { | |
399 | .llseek = proc_reg_llseek, | |
400 | .read = proc_reg_read, | |
401 | .write = proc_reg_write, | |
402 | .poll = proc_reg_poll, | |
403 | .unlocked_ioctl = proc_reg_unlocked_ioctl, | |
404 | .mmap = proc_reg_mmap, | |
c4fe2448 | 405 | .get_unmapped_area = proc_reg_get_unmapped_area, |
778f3dd5 DM |
406 | .open = proc_reg_open, |
407 | .release = proc_reg_release, | |
408 | }; | |
409 | #endif | |
410 | ||
fceef393 AV |
411 | static void proc_put_link(void *p) |
412 | { | |
413 | unuse_pde(p); | |
414 | } | |
415 | ||
6b255391 | 416 | static const char *proc_get_link(struct dentry *dentry, |
fceef393 AV |
417 | struct inode *inode, |
418 | struct delayed_call *done) | |
7e0e953b | 419 | { |
6b255391 | 420 | struct proc_dir_entry *pde = PDE(inode); |
7e0e953b AV |
421 | if (unlikely(!use_pde(pde))) |
422 | return ERR_PTR(-EINVAL); | |
fceef393 | 423 | set_delayed_call(done, proc_put_link, pde); |
680baacb | 424 | return pde->data; |
7e0e953b AV |
425 | } |
426 | ||
7e0e953b | 427 | const struct inode_operations proc_link_inode_operations = { |
6b255391 | 428 | .get_link = proc_get_link, |
7e0e953b AV |
429 | }; |
430 | ||
6d1b6e4e | 431 | struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de) |
1da177e4 | 432 | { |
51f0885e | 433 | struct inode *inode = new_inode_pseudo(sb); |
1da177e4 | 434 | |
51f0885e LT |
435 | if (inode) { |
436 | inode->i_ino = de->low_ino; | |
078cd827 | 437 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
a1d4aebb | 438 | PROC_I(inode)->pde = de; |
5e971dce | 439 | |
eb6d38d5 EB |
440 | if (is_empty_pde(de)) { |
441 | make_empty_dir_inode(inode); | |
442 | return inode; | |
443 | } | |
5e971dce AD |
444 | if (de->mode) { |
445 | inode->i_mode = de->mode; | |
446 | inode->i_uid = de->uid; | |
447 | inode->i_gid = de->gid; | |
448 | } | |
449 | if (de->size) | |
450 | inode->i_size = de->size; | |
451 | if (de->nlink) | |
bfe86848 | 452 | set_nlink(inode, de->nlink); |
b6cdc731 AV |
453 | WARN_ON(!de->proc_iops); |
454 | inode->i_op = de->proc_iops; | |
5e971dce AD |
455 | if (de->proc_fops) { |
456 | if (S_ISREG(inode->i_mode)) { | |
778f3dd5 | 457 | #ifdef CONFIG_COMPAT |
5e971dce AD |
458 | if (!de->proc_fops->compat_ioctl) |
459 | inode->i_fop = | |
460 | &proc_reg_file_ops_no_compat; | |
461 | else | |
778f3dd5 | 462 | #endif |
5e971dce AD |
463 | inode->i_fop = &proc_reg_file_ops; |
464 | } else { | |
465 | inode->i_fop = de->proc_fops; | |
778f3dd5 | 466 | } |
786d7e16 | 467 | } |
99b76233 | 468 | } else |
135d5655 | 469 | pde_put(de); |
1da177e4 | 470 | return inode; |
d3d009cb | 471 | } |
1da177e4 | 472 | |
e94591d0 | 473 | int proc_fill_super(struct super_block *s, void *data, int silent) |
1da177e4 | 474 | { |
e94591d0 | 475 | struct pid_namespace *ns = get_pid_ns(s->s_fs_info); |
87e0aab3 | 476 | struct inode *root_inode; |
0097875b | 477 | int ret; |
87e0aab3 | 478 | |
e94591d0 EB |
479 | if (!proc_parse_options(data, ns)) |
480 | return -EINVAL; | |
481 | ||
a2982cc9 EB |
482 | /* User space would break if executables or devices appear on proc */ |
483 | s->s_iflags |= SB_I_USERNS_VISIBLE | SB_I_NOEXEC | SB_I_NODEV; | |
92d03285 | 484 | s->s_flags |= MS_NODIRATIME | MS_NOSUID | MS_NOEXEC; |
1da177e4 LT |
485 | s->s_blocksize = 1024; |
486 | s->s_blocksize_bits = 10; | |
487 | s->s_magic = PROC_SUPER_MAGIC; | |
488 | s->s_op = &proc_sops; | |
489 | s->s_time_gran = 1; | |
a867d734 LT |
490 | |
491 | /* | |
492 | * procfs isn't actually a stacking filesystem; however, there is | |
493 | * too much magic going on inside it to permit stacking things on | |
494 | * top of it | |
495 | */ | |
496 | s->s_stack_depth = FILESYSTEM_MAX_STACK_DEPTH; | |
1da177e4 | 497 | |
135d5655 | 498 | pde_get(&proc_root); |
87e0aab3 MP |
499 | root_inode = proc_get_inode(s, &proc_root); |
500 | if (!root_inode) { | |
87ebdc00 | 501 | pr_err("proc_fill_super: get root inode failed\n"); |
87e0aab3 MP |
502 | return -ENOMEM; |
503 | } | |
1da177e4 | 504 | |
87e0aab3 MP |
505 | s->s_root = d_make_root(root_inode); |
506 | if (!s->s_root) { | |
87ebdc00 | 507 | pr_err("proc_fill_super: allocate dentry failed\n"); |
87e0aab3 MP |
508 | return -ENOMEM; |
509 | } | |
510 | ||
0097875b EB |
511 | ret = proc_setup_self(s); |
512 | if (ret) { | |
513 | return ret; | |
514 | } | |
515 | return proc_setup_thread_self(s); | |
1da177e4 | 516 | } |