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Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/proc/inode.c | |
4 | * | |
5 | * Copyright (C) 1991, 1992 Linus Torvalds | |
6 | */ | |
7 | ||
efb1a57d | 8 | #include <linux/cache.h> |
1da177e4 LT |
9 | #include <linux/time.h> |
10 | #include <linux/proc_fs.h> | |
11 | #include <linux/kernel.h> | |
97412950 | 12 | #include <linux/pid_namespace.h> |
1da177e4 LT |
13 | #include <linux/mm.h> |
14 | #include <linux/string.h> | |
15 | #include <linux/stat.h> | |
786d7e16 | 16 | #include <linux/completion.h> |
dd23aae4 | 17 | #include <linux/poll.h> |
87ebdc00 | 18 | #include <linux/printk.h> |
1da177e4 LT |
19 | #include <linux/file.h> |
20 | #include <linux/limits.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/module.h> | |
9043476f | 23 | #include <linux/sysctl.h> |
97412950 | 24 | #include <linux/seq_file.h> |
5a0e3ad6 | 25 | #include <linux/slab.h> |
97412950 | 26 | #include <linux/mount.h> |
1da177e4 | 27 | |
7c0f6ba6 | 28 | #include <linux/uaccess.h> |
1da177e4 | 29 | |
fee781e6 | 30 | #include "internal.h" |
1da177e4 | 31 | |
8267952b | 32 | static void proc_evict_inode(struct inode *inode) |
1da177e4 LT |
33 | { |
34 | struct proc_dir_entry *de; | |
dfef6dcd | 35 | struct ctl_table_header *head; |
71448011 | 36 | struct proc_inode *ei = PROC_I(inode); |
1da177e4 | 37 | |
91b0abe3 | 38 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 39 | clear_inode(inode); |
fef26658 | 40 | |
99f89551 | 41 | /* Stop tracking associated processes */ |
71448011 | 42 | if (ei->pid) { |
7bc3e6e5 | 43 | proc_pid_evict_inode(ei); |
71448011 EB |
44 | ei->pid = NULL; |
45 | } | |
1da177e4 LT |
46 | |
47 | /* Let go of any associated proc directory entry */ | |
71448011 EB |
48 | de = ei->pde; |
49 | if (de) { | |
135d5655 | 50 | pde_put(de); |
71448011 EB |
51 | ei->pde = NULL; |
52 | } | |
d6cffbbe | 53 | |
71448011 | 54 | head = ei->sysctl; |
dfef6dcd | 55 | if (head) { |
71448011 | 56 | RCU_INIT_POINTER(ei->sysctl, NULL); |
d6cffbbe | 57 | proc_sys_evict_inode(inode, head); |
dfef6dcd | 58 | } |
1da177e4 LT |
59 | } |
60 | ||
efb1a57d | 61 | static struct kmem_cache *proc_inode_cachep __ro_after_init; |
195b8cf0 | 62 | static struct kmem_cache *pde_opener_cache __ro_after_init; |
1da177e4 LT |
63 | |
64 | static struct inode *proc_alloc_inode(struct super_block *sb) | |
65 | { | |
66 | struct proc_inode *ei; | |
1da177e4 | 67 | |
f245e1c1 | 68 | ei = kmem_cache_alloc(proc_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
69 | if (!ei) |
70 | return NULL; | |
13b41b09 | 71 | ei->pid = NULL; |
aed7a6c4 | 72 | ei->fd = 0; |
1da177e4 LT |
73 | ei->op.proc_get_link = NULL; |
74 | ei->pde = NULL; | |
9043476f AV |
75 | ei->sysctl = NULL; |
76 | ei->sysctl_entry = NULL; | |
0afa5ca8 | 77 | INIT_HLIST_NODE(&ei->sibling_inodes); |
3d3d35b1 | 78 | ei->ns_ops = NULL; |
230f72e9 | 79 | return &ei->vfs_inode; |
1da177e4 LT |
80 | } |
81 | ||
4aa6b55c | 82 | static void proc_free_inode(struct inode *inode) |
1da177e4 LT |
83 | { |
84 | kmem_cache_free(proc_inode_cachep, PROC_I(inode)); | |
85 | } | |
86 | ||
51cc5068 | 87 | static void init_once(void *foo) |
1da177e4 LT |
88 | { |
89 | struct proc_inode *ei = (struct proc_inode *) foo; | |
90 | ||
a35afb83 | 91 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 92 | } |
20c2df83 | 93 | |
195b8cf0 | 94 | void __init proc_init_kmemcache(void) |
1da177e4 LT |
95 | { |
96 | proc_inode_cachep = kmem_cache_create("proc_inode_cache", | |
97 | sizeof(struct proc_inode), | |
fffb60f9 | 98 | 0, (SLAB_RECLAIM_ACCOUNT| |
5d097056 VD |
99 | SLAB_MEM_SPREAD|SLAB_ACCOUNT| |
100 | SLAB_PANIC), | |
20c2df83 | 101 | init_once); |
195b8cf0 AD |
102 | pde_opener_cache = |
103 | kmem_cache_create("pde_opener", sizeof(struct pde_opener), 0, | |
2acddbe8 | 104 | SLAB_ACCOUNT|SLAB_PANIC, NULL); |
b4884f23 | 105 | proc_dir_entry_cache = kmem_cache_create_usercopy( |
2d6e4e82 AD |
106 | "proc_dir_entry", SIZEOF_PDE, 0, SLAB_PANIC, |
107 | offsetof(struct proc_dir_entry, inline_name), | |
108 | SIZEOF_PDE_INLINE_NAME, NULL); | |
109 | BUILD_BUG_ON(sizeof(struct proc_dir_entry) >= SIZEOF_PDE); | |
1da177e4 LT |
110 | } |
111 | ||
f90f3caf | 112 | void proc_invalidate_siblings_dcache(struct hlist_head *inodes, spinlock_t *lock) |
26dbc60f EB |
113 | { |
114 | struct inode *inode; | |
115 | struct proc_inode *ei; | |
116 | struct hlist_node *node; | |
080f6276 | 117 | struct super_block *old_sb = NULL; |
26dbc60f EB |
118 | |
119 | rcu_read_lock(); | |
120 | for (;;) { | |
080f6276 | 121 | struct super_block *sb; |
26dbc60f EB |
122 | node = hlist_first_rcu(inodes); |
123 | if (!node) | |
124 | break; | |
125 | ei = hlist_entry(node, struct proc_inode, sibling_inodes); | |
126 | spin_lock(lock); | |
127 | hlist_del_init_rcu(&ei->sibling_inodes); | |
128 | spin_unlock(lock); | |
129 | ||
130 | inode = &ei->vfs_inode; | |
131 | sb = inode->i_sb; | |
080f6276 | 132 | if ((sb != old_sb) && !atomic_inc_not_zero(&sb->s_active)) |
26dbc60f EB |
133 | continue; |
134 | inode = igrab(inode); | |
135 | rcu_read_unlock(); | |
080f6276 EB |
136 | if (sb != old_sb) { |
137 | if (old_sb) | |
138 | deactivate_super(old_sb); | |
139 | old_sb = sb; | |
140 | } | |
26dbc60f | 141 | if (unlikely(!inode)) { |
26dbc60f EB |
142 | rcu_read_lock(); |
143 | continue; | |
144 | } | |
145 | ||
f90f3caf EB |
146 | if (S_ISDIR(inode->i_mode)) { |
147 | struct dentry *dir = d_find_any_alias(inode); | |
148 | if (dir) { | |
149 | d_invalidate(dir); | |
150 | dput(dir); | |
151 | } | |
152 | } else { | |
153 | struct dentry *dentry; | |
154 | while ((dentry = d_find_alias(inode))) { | |
155 | d_invalidate(dentry); | |
156 | dput(dentry); | |
157 | } | |
158 | } | |
26dbc60f | 159 | iput(inode); |
26dbc60f EB |
160 | |
161 | rcu_read_lock(); | |
162 | } | |
163 | rcu_read_unlock(); | |
080f6276 EB |
164 | if (old_sb) |
165 | deactivate_super(old_sb); | |
26dbc60f EB |
166 | } |
167 | ||
97412950 VK |
168 | static int proc_show_options(struct seq_file *seq, struct dentry *root) |
169 | { | |
0499680a VK |
170 | struct super_block *sb = root->d_sb; |
171 | struct pid_namespace *pid = sb->s_fs_info; | |
172 | ||
dcb0f222 EB |
173 | if (!gid_eq(pid->pid_gid, GLOBAL_ROOT_GID)) |
174 | seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, pid->pid_gid)); | |
796f571b | 175 | if (pid->hide_pid != HIDEPID_OFF) |
0499680a VK |
176 | seq_printf(seq, ",hidepid=%u", pid->hide_pid); |
177 | ||
97412950 VK |
178 | return 0; |
179 | } | |
180 | ||
60a3c3a5 | 181 | const struct super_operations proc_sops = { |
1da177e4 | 182 | .alloc_inode = proc_alloc_inode, |
4aa6b55c | 183 | .free_inode = proc_free_inode, |
1da177e4 | 184 | .drop_inode = generic_delete_inode, |
8267952b | 185 | .evict_inode = proc_evict_inode, |
1da177e4 | 186 | .statfs = simple_statfs, |
97412950 | 187 | .show_options = proc_show_options, |
1da177e4 LT |
188 | }; |
189 | ||
866ad9a7 AV |
190 | enum {BIAS = -1U<<31}; |
191 | ||
192 | static inline int use_pde(struct proc_dir_entry *pde) | |
193 | { | |
15b158b4 | 194 | return likely(atomic_inc_unless_negative(&pde->in_use)); |
881adb85 AD |
195 | } |
196 | ||
866ad9a7 | 197 | static void unuse_pde(struct proc_dir_entry *pde) |
881adb85 | 198 | { |
15b158b4 | 199 | if (unlikely(atomic_dec_return(&pde->in_use) == BIAS)) |
05c0ae21 | 200 | complete(pde->pde_unload_completion); |
786d7e16 AD |
201 | } |
202 | ||
2f897424 | 203 | /* pde is locked on entry, unlocked on exit */ |
ca469f35 | 204 | static void close_pdeo(struct proc_dir_entry *pde, struct pde_opener *pdeo) |
904f394e | 205 | __releases(&pde->pde_unload_lock) |
ca469f35 | 206 | { |
492b2da6 AD |
207 | /* |
208 | * close() (proc_reg_release()) can't delete an entry and proceed: | |
209 | * ->release hook needs to be available at the right moment. | |
210 | * | |
211 | * rmmod (remove_proc_entry() et al) can't delete an entry and proceed: | |
212 | * "struct file" needs to be available at the right moment. | |
213 | * | |
214 | * Therefore, first process to enter this function does ->release() and | |
215 | * signals its completion to the other process which does nothing. | |
216 | */ | |
05c0ae21 | 217 | if (pdeo->closing) { |
ca469f35 | 218 | /* somebody else is doing that, just wait */ |
05c0ae21 AV |
219 | DECLARE_COMPLETION_ONSTACK(c); |
220 | pdeo->c = &c; | |
ca469f35 | 221 | spin_unlock(&pde->pde_unload_lock); |
05c0ae21 | 222 | wait_for_completion(&c); |
ca469f35 AV |
223 | } else { |
224 | struct file *file; | |
2f897424 AD |
225 | struct completion *c; |
226 | ||
f5887c71 | 227 | pdeo->closing = true; |
ca469f35 AV |
228 | spin_unlock(&pde->pde_unload_lock); |
229 | file = pdeo->file; | |
d56c0d45 | 230 | pde->proc_ops->proc_release(file_inode(file), file); |
ca469f35 | 231 | spin_lock(&pde->pde_unload_lock); |
492b2da6 | 232 | /* After ->release. */ |
06a0c417 | 233 | list_del(&pdeo->lh); |
2f897424 AD |
234 | c = pdeo->c; |
235 | spin_unlock(&pde->pde_unload_lock); | |
236 | if (unlikely(c)) | |
237 | complete(c); | |
195b8cf0 | 238 | kmem_cache_free(pde_opener_cache, pdeo); |
05c0ae21 | 239 | } |
ca469f35 AV |
240 | } |
241 | ||
866ad9a7 | 242 | void proc_entry_rundown(struct proc_dir_entry *de) |
786d7e16 | 243 | { |
05c0ae21 | 244 | DECLARE_COMPLETION_ONSTACK(c); |
866ad9a7 | 245 | /* Wait until all existing callers into module are done. */ |
05c0ae21 AV |
246 | de->pde_unload_completion = &c; |
247 | if (atomic_add_return(BIAS, &de->in_use) != BIAS) | |
248 | wait_for_completion(&c); | |
786d7e16 | 249 | |
492b2da6 AD |
250 | /* ->pde_openers list can't grow from now on. */ |
251 | ||
05c0ae21 | 252 | spin_lock(&de->pde_unload_lock); |
866ad9a7 AV |
253 | while (!list_empty(&de->pde_openers)) { |
254 | struct pde_opener *pdeo; | |
866ad9a7 | 255 | pdeo = list_first_entry(&de->pde_openers, struct pde_opener, lh); |
ca469f35 | 256 | close_pdeo(de, pdeo); |
2f897424 | 257 | spin_lock(&de->pde_unload_lock); |
866ad9a7 AV |
258 | } |
259 | spin_unlock(&de->pde_unload_lock); | |
786d7e16 AD |
260 | } |
261 | ||
866ad9a7 AV |
262 | static loff_t proc_reg_llseek(struct file *file, loff_t offset, int whence) |
263 | { | |
264 | struct proc_dir_entry *pde = PDE(file_inode(file)); | |
265 | loff_t rv = -EINVAL; | |
266 | if (use_pde(pde)) { | |
d56c0d45 | 267 | typeof_member(struct proc_ops, proc_lseek) lseek; |
9af27b28 | 268 | |
d56c0d45 AD |
269 | lseek = pde->proc_ops->proc_lseek; |
270 | if (!lseek) | |
271 | lseek = default_llseek; | |
272 | rv = lseek(file, offset, whence); | |
866ad9a7 AV |
273 | unuse_pde(pde); |
274 | } | |
786d7e16 AD |
275 | return rv; |
276 | } | |
277 | ||
866ad9a7 | 278 | static ssize_t proc_reg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
786d7e16 | 279 | { |
496ad9aa | 280 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 281 | ssize_t rv = -EIO; |
866ad9a7 | 282 | if (use_pde(pde)) { |
d56c0d45 | 283 | typeof_member(struct proc_ops, proc_read) read; |
9af27b28 | 284 | |
d56c0d45 | 285 | read = pde->proc_ops->proc_read; |
866ad9a7 AV |
286 | if (read) |
287 | rv = read(file, buf, count, ppos); | |
288 | unuse_pde(pde); | |
786d7e16 | 289 | } |
866ad9a7 AV |
290 | return rv; |
291 | } | |
786d7e16 | 292 | |
866ad9a7 AV |
293 | static ssize_t proc_reg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
294 | { | |
866ad9a7 AV |
295 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
296 | ssize_t rv = -EIO; | |
297 | if (use_pde(pde)) { | |
d56c0d45 | 298 | typeof_member(struct proc_ops, proc_write) write; |
9af27b28 | 299 | |
d56c0d45 | 300 | write = pde->proc_ops->proc_write; |
866ad9a7 AV |
301 | if (write) |
302 | rv = write(file, buf, count, ppos); | |
303 | unuse_pde(pde); | |
304 | } | |
786d7e16 AD |
305 | return rv; |
306 | } | |
307 | ||
076ccb76 | 308 | static __poll_t proc_reg_poll(struct file *file, struct poll_table_struct *pts) |
786d7e16 | 309 | { |
496ad9aa | 310 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
e6c8adca | 311 | __poll_t rv = DEFAULT_POLLMASK; |
866ad9a7 | 312 | if (use_pde(pde)) { |
d56c0d45 | 313 | typeof_member(struct proc_ops, proc_poll) poll; |
9af27b28 | 314 | |
d56c0d45 | 315 | poll = pde->proc_ops->proc_poll; |
866ad9a7 AV |
316 | if (poll) |
317 | rv = poll(file, pts); | |
318 | unuse_pde(pde); | |
786d7e16 | 319 | } |
786d7e16 AD |
320 | return rv; |
321 | } | |
322 | ||
323 | static long proc_reg_unlocked_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
324 | { | |
496ad9aa | 325 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 326 | long rv = -ENOTTY; |
866ad9a7 | 327 | if (use_pde(pde)) { |
d56c0d45 | 328 | typeof_member(struct proc_ops, proc_ioctl) ioctl; |
9af27b28 | 329 | |
d56c0d45 | 330 | ioctl = pde->proc_ops->proc_ioctl; |
866ad9a7 AV |
331 | if (ioctl) |
332 | rv = ioctl(file, cmd, arg); | |
333 | unuse_pde(pde); | |
786d7e16 | 334 | } |
786d7e16 AD |
335 | return rv; |
336 | } | |
337 | ||
338 | #ifdef CONFIG_COMPAT | |
339 | static long proc_reg_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
340 | { | |
496ad9aa | 341 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 342 | long rv = -ENOTTY; |
866ad9a7 | 343 | if (use_pde(pde)) { |
d56c0d45 | 344 | typeof_member(struct proc_ops, proc_compat_ioctl) compat_ioctl; |
9af27b28 | 345 | |
d56c0d45 | 346 | compat_ioctl = pde->proc_ops->proc_compat_ioctl; |
866ad9a7 AV |
347 | if (compat_ioctl) |
348 | rv = compat_ioctl(file, cmd, arg); | |
349 | unuse_pde(pde); | |
786d7e16 | 350 | } |
786d7e16 AD |
351 | return rv; |
352 | } | |
353 | #endif | |
354 | ||
355 | static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma) | |
356 | { | |
496ad9aa | 357 | struct proc_dir_entry *pde = PDE(file_inode(file)); |
786d7e16 | 358 | int rv = -EIO; |
866ad9a7 | 359 | if (use_pde(pde)) { |
d56c0d45 | 360 | typeof_member(struct proc_ops, proc_mmap) mmap; |
9af27b28 | 361 | |
d56c0d45 | 362 | mmap = pde->proc_ops->proc_mmap; |
866ad9a7 AV |
363 | if (mmap) |
364 | rv = mmap(file, vma); | |
365 | unuse_pde(pde); | |
786d7e16 | 366 | } |
786d7e16 AD |
367 | return rv; |
368 | } | |
369 | ||
5721cf84 HD |
370 | static unsigned long |
371 | proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr, | |
372 | unsigned long len, unsigned long pgoff, | |
373 | unsigned long flags) | |
c4fe2448 AD |
374 | { |
375 | struct proc_dir_entry *pde = PDE(file_inode(file)); | |
2cbe3b0a | 376 | unsigned long rv = -EIO; |
ae5758a1 | 377 | |
c4fe2448 | 378 | if (use_pde(pde)) { |
d56c0d45 | 379 | typeof_member(struct proc_ops, proc_get_unmapped_area) get_area; |
ae5758a1 | 380 | |
d56c0d45 | 381 | get_area = pde->proc_ops->proc_get_unmapped_area; |
fad1a86e | 382 | #ifdef CONFIG_MMU |
ae5758a1 JB |
383 | if (!get_area) |
384 | get_area = current->mm->get_unmapped_area; | |
fad1a86e | 385 | #endif |
ae5758a1 | 386 | |
5721cf84 HD |
387 | if (get_area) |
388 | rv = get_area(file, orig_addr, len, pgoff, flags); | |
ae5758a1 JB |
389 | else |
390 | rv = orig_addr; | |
c4fe2448 AD |
391 | unuse_pde(pde); |
392 | } | |
393 | return rv; | |
394 | } | |
395 | ||
786d7e16 AD |
396 | static int proc_reg_open(struct inode *inode, struct file *file) |
397 | { | |
398 | struct proc_dir_entry *pde = PDE(inode); | |
399 | int rv = 0; | |
d56c0d45 AD |
400 | typeof_member(struct proc_ops, proc_open) open; |
401 | typeof_member(struct proc_ops, proc_release) release; | |
881adb85 AD |
402 | struct pde_opener *pdeo; |
403 | ||
404 | /* | |
492b2da6 AD |
405 | * Ensure that |
406 | * 1) PDE's ->release hook will be called no matter what | |
407 | * either normally by close()/->release, or forcefully by | |
408 | * rmmod/remove_proc_entry. | |
409 | * | |
410 | * 2) rmmod isn't blocked by opening file in /proc and sitting on | |
411 | * the descriptor (including "rmmod foo </proc/foo" scenario). | |
881adb85 | 412 | * |
492b2da6 | 413 | * Save every "struct file" with custom ->release hook. |
881adb85 | 414 | */ |
e7a6e291 | 415 | if (!use_pde(pde)) |
d2857e79 | 416 | return -ENOENT; |
e7a6e291 | 417 | |
d56c0d45 | 418 | release = pde->proc_ops->proc_release; |
e7a6e291 | 419 | if (release) { |
195b8cf0 | 420 | pdeo = kmem_cache_alloc(pde_opener_cache, GFP_KERNEL); |
e7a6e291 AD |
421 | if (!pdeo) { |
422 | rv = -ENOMEM; | |
423 | goto out_unuse; | |
424 | } | |
425 | } | |
786d7e16 | 426 | |
d56c0d45 | 427 | open = pde->proc_ops->proc_open; |
786d7e16 AD |
428 | if (open) |
429 | rv = open(inode, file); | |
430 | ||
e7a6e291 AD |
431 | if (release) { |
432 | if (rv == 0) { | |
433 | /* To know what to release. */ | |
434 | pdeo->file = file; | |
435 | pdeo->closing = false; | |
436 | pdeo->c = NULL; | |
437 | spin_lock(&pde->pde_unload_lock); | |
438 | list_add(&pdeo->lh, &pde->pde_openers); | |
439 | spin_unlock(&pde->pde_unload_lock); | |
440 | } else | |
195b8cf0 | 441 | kmem_cache_free(pde_opener_cache, pdeo); |
e7a6e291 | 442 | } |
05c0ae21 | 443 | |
e7a6e291 | 444 | out_unuse: |
05c0ae21 | 445 | unuse_pde(pde); |
786d7e16 AD |
446 | return rv; |
447 | } | |
448 | ||
449 | static int proc_reg_release(struct inode *inode, struct file *file) | |
450 | { | |
451 | struct proc_dir_entry *pde = PDE(inode); | |
881adb85 | 452 | struct pde_opener *pdeo; |
786d7e16 | 453 | spin_lock(&pde->pde_unload_lock); |
ca469f35 AV |
454 | list_for_each_entry(pdeo, &pde->pde_openers, lh) { |
455 | if (pdeo->file == file) { | |
456 | close_pdeo(pde, pdeo); | |
2f897424 | 457 | return 0; |
ca469f35 | 458 | } |
881adb85 | 459 | } |
786d7e16 | 460 | spin_unlock(&pde->pde_unload_lock); |
ca469f35 | 461 | return 0; |
786d7e16 AD |
462 | } |
463 | ||
464 | static const struct file_operations proc_reg_file_ops = { | |
465 | .llseek = proc_reg_llseek, | |
466 | .read = proc_reg_read, | |
467 | .write = proc_reg_write, | |
468 | .poll = proc_reg_poll, | |
469 | .unlocked_ioctl = proc_reg_unlocked_ioctl, | |
470 | #ifdef CONFIG_COMPAT | |
471 | .compat_ioctl = proc_reg_compat_ioctl, | |
472 | #endif | |
473 | .mmap = proc_reg_mmap, | |
c4fe2448 | 474 | .get_unmapped_area = proc_reg_get_unmapped_area, |
786d7e16 AD |
475 | .open = proc_reg_open, |
476 | .release = proc_reg_release, | |
477 | }; | |
478 | ||
778f3dd5 DM |
479 | #ifdef CONFIG_COMPAT |
480 | static const struct file_operations proc_reg_file_ops_no_compat = { | |
481 | .llseek = proc_reg_llseek, | |
482 | .read = proc_reg_read, | |
483 | .write = proc_reg_write, | |
484 | .poll = proc_reg_poll, | |
485 | .unlocked_ioctl = proc_reg_unlocked_ioctl, | |
486 | .mmap = proc_reg_mmap, | |
c4fe2448 | 487 | .get_unmapped_area = proc_reg_get_unmapped_area, |
778f3dd5 DM |
488 | .open = proc_reg_open, |
489 | .release = proc_reg_release, | |
490 | }; | |
491 | #endif | |
492 | ||
fceef393 AV |
493 | static void proc_put_link(void *p) |
494 | { | |
495 | unuse_pde(p); | |
496 | } | |
497 | ||
6b255391 | 498 | static const char *proc_get_link(struct dentry *dentry, |
fceef393 AV |
499 | struct inode *inode, |
500 | struct delayed_call *done) | |
7e0e953b | 501 | { |
6b255391 | 502 | struct proc_dir_entry *pde = PDE(inode); |
15b158b4 | 503 | if (!use_pde(pde)) |
7e0e953b | 504 | return ERR_PTR(-EINVAL); |
fceef393 | 505 | set_delayed_call(done, proc_put_link, pde); |
680baacb | 506 | return pde->data; |
7e0e953b AV |
507 | } |
508 | ||
7e0e953b | 509 | const struct inode_operations proc_link_inode_operations = { |
6b255391 | 510 | .get_link = proc_get_link, |
7e0e953b AV |
511 | }; |
512 | ||
6d1b6e4e | 513 | struct inode *proc_get_inode(struct super_block *sb, struct proc_dir_entry *de) |
1da177e4 | 514 | { |
51f0885e | 515 | struct inode *inode = new_inode_pseudo(sb); |
1da177e4 | 516 | |
51f0885e LT |
517 | if (inode) { |
518 | inode->i_ino = de->low_ino; | |
078cd827 | 519 | inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode); |
a1d4aebb | 520 | PROC_I(inode)->pde = de; |
5e971dce | 521 | |
eb6d38d5 EB |
522 | if (is_empty_pde(de)) { |
523 | make_empty_dir_inode(inode); | |
524 | return inode; | |
525 | } | |
5e971dce AD |
526 | if (de->mode) { |
527 | inode->i_mode = de->mode; | |
528 | inode->i_uid = de->uid; | |
529 | inode->i_gid = de->gid; | |
530 | } | |
531 | if (de->size) | |
532 | inode->i_size = de->size; | |
533 | if (de->nlink) | |
bfe86848 | 534 | set_nlink(inode, de->nlink); |
d56c0d45 AD |
535 | |
536 | if (S_ISREG(inode->i_mode)) { | |
537 | inode->i_op = de->proc_iops; | |
538 | inode->i_fop = &proc_reg_file_ops; | |
778f3dd5 | 539 | #ifdef CONFIG_COMPAT |
d56c0d45 AD |
540 | if (!de->proc_ops->proc_compat_ioctl) { |
541 | inode->i_fop = &proc_reg_file_ops_no_compat; | |
778f3dd5 | 542 | } |
d56c0d45 AD |
543 | #endif |
544 | } else if (S_ISDIR(inode->i_mode)) { | |
545 | inode->i_op = de->proc_iops; | |
546 | inode->i_fop = de->proc_dir_ops; | |
547 | } else if (S_ISLNK(inode->i_mode)) { | |
548 | inode->i_op = de->proc_iops; | |
549 | inode->i_fop = NULL; | |
550 | } else | |
551 | BUG(); | |
99b76233 | 552 | } else |
135d5655 | 553 | pde_put(de); |
1da177e4 | 554 | return inode; |
d3d009cb | 555 | } |