Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * proc/fs/generic.c --- generic routines for the proc-fs | |
3 | * | |
4 | * This file contains generic proc-fs routines for handling | |
5 | * directories and files. | |
6 | * | |
7 | * Copyright (C) 1991, 1992 Linus Torvalds. | |
8 | * Copyright (C) 1997 Theodore Ts'o | |
9 | */ | |
10 | ||
11 | #include <linux/errno.h> | |
12 | #include <linux/time.h> | |
13 | #include <linux/proc_fs.h> | |
14 | #include <linux/stat.h> | |
1025774c | 15 | #include <linux/mm.h> |
1da177e4 | 16 | #include <linux/module.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
87ebdc00 | 18 | #include <linux/printk.h> |
1da177e4 | 19 | #include <linux/mount.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/idr.h> | |
22 | #include <linux/namei.h> | |
23 | #include <linux/bitops.h> | |
64a07bd8 | 24 | #include <linux/spinlock.h> |
786d7e16 | 25 | #include <linux/completion.h> |
1da177e4 LT |
26 | #include <asm/uaccess.h> |
27 | ||
fee781e6 AB |
28 | #include "internal.h" |
29 | ||
64a07bd8 SR |
30 | DEFINE_SPINLOCK(proc_subdir_lock); |
31 | ||
312ec7e5 | 32 | static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de) |
1da177e4 LT |
33 | { |
34 | if (de->namelen != len) | |
35 | return 0; | |
36 | return !memcmp(name, de->name, len); | |
37 | } | |
38 | ||
1da177e4 LT |
39 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
40 | { | |
41 | struct inode *inode = dentry->d_inode; | |
42 | struct proc_dir_entry *de = PDE(inode); | |
43 | int error; | |
44 | ||
45 | error = inode_change_ok(inode, iattr); | |
46 | if (error) | |
1025774c | 47 | return error; |
1da177e4 | 48 | |
1025774c CH |
49 | setattr_copy(inode, iattr); |
50 | mark_inode_dirty(inode); | |
46f69557 | 51 | |
cdf7e8dd | 52 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 53 | de->mode = inode->i_mode; |
1025774c | 54 | return 0; |
1da177e4 LT |
55 | } |
56 | ||
2b579bee MS |
57 | static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry, |
58 | struct kstat *stat) | |
59 | { | |
60 | struct inode *inode = dentry->d_inode; | |
61 | struct proc_dir_entry *de = PROC_I(inode)->pde; | |
62 | if (de && de->nlink) | |
bfe86848 | 63 | set_nlink(inode, de->nlink); |
2b579bee MS |
64 | |
65 | generic_fillattr(inode, stat); | |
66 | return 0; | |
67 | } | |
68 | ||
c5ef1c42 | 69 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
70 | .setattr = proc_notify_change, |
71 | }; | |
72 | ||
73 | /* | |
74 | * This function parses a name such as "tty/driver/serial", and | |
75 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
76 | * returns "serial" in residual. | |
77 | */ | |
e17a5765 AD |
78 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
79 | const char **residual) | |
1da177e4 LT |
80 | { |
81 | const char *cp = name, *next; | |
82 | struct proc_dir_entry *de; | |
312ec7e5 | 83 | unsigned int len; |
1da177e4 | 84 | |
7cee4e00 AD |
85 | de = *ret; |
86 | if (!de) | |
87 | de = &proc_root; | |
88 | ||
1da177e4 LT |
89 | while (1) { |
90 | next = strchr(cp, '/'); | |
91 | if (!next) | |
92 | break; | |
93 | ||
94 | len = next - cp; | |
95 | for (de = de->subdir; de ; de = de->next) { | |
96 | if (proc_match(len, cp, de)) | |
97 | break; | |
98 | } | |
12bac0d9 AD |
99 | if (!de) { |
100 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 101 | return -ENOENT; |
12bac0d9 | 102 | } |
1da177e4 LT |
103 | cp += len + 1; |
104 | } | |
105 | *residual = cp; | |
106 | *ret = de; | |
e17a5765 AD |
107 | return 0; |
108 | } | |
109 | ||
110 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
111 | const char **residual) | |
112 | { | |
113 | int rv; | |
114 | ||
115 | spin_lock(&proc_subdir_lock); | |
116 | rv = __xlate_proc_name(name, ret, residual); | |
64a07bd8 | 117 | spin_unlock(&proc_subdir_lock); |
e17a5765 | 118 | return rv; |
1da177e4 LT |
119 | } |
120 | ||
9a185409 | 121 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 LT |
122 | static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */ |
123 | ||
67935df4 | 124 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
125 | |
126 | /* | |
127 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
128 | * 0xffffffff, or zero on failure. | |
129 | */ | |
33d6dce6 | 130 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 131 | { |
67935df4 | 132 | unsigned int i; |
1da177e4 LT |
133 | int error; |
134 | ||
135 | retry: | |
33d6dce6 EB |
136 | if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) |
137 | return -ENOMEM; | |
1da177e4 | 138 | |
dfb2ea45 | 139 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 140 | error = ida_get_new(&proc_inum_ida, &i); |
dfb2ea45 | 141 | spin_unlock_irq(&proc_inum_lock); |
1da177e4 LT |
142 | if (error == -EAGAIN) |
143 | goto retry; | |
144 | else if (error) | |
33d6dce6 | 145 | return error; |
1da177e4 | 146 | |
67935df4 | 147 | if (i > UINT_MAX - PROC_DYNAMIC_FIRST) { |
dfb2ea45 | 148 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 149 | ida_remove(&proc_inum_ida, i); |
dfb2ea45 | 150 | spin_unlock_irq(&proc_inum_lock); |
33d6dce6 | 151 | return -ENOSPC; |
67935df4 | 152 | } |
33d6dce6 EB |
153 | *inum = PROC_DYNAMIC_FIRST + i; |
154 | return 0; | |
1da177e4 LT |
155 | } |
156 | ||
33d6dce6 | 157 | void proc_free_inum(unsigned int inum) |
1da177e4 | 158 | { |
dfb2ea45 EB |
159 | unsigned long flags; |
160 | spin_lock_irqsave(&proc_inum_lock, flags); | |
9a185409 | 161 | ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
dfb2ea45 | 162 | spin_unlock_irqrestore(&proc_inum_lock, flags); |
1da177e4 LT |
163 | } |
164 | ||
008b150a | 165 | static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 166 | { |
c30480b9 | 167 | nd_set_link(nd, __PDE_DATA(dentry->d_inode)); |
008b150a | 168 | return NULL; |
1da177e4 LT |
169 | } |
170 | ||
c5ef1c42 | 171 | static const struct inode_operations proc_link_inode_operations = { |
1da177e4 LT |
172 | .readlink = generic_readlink, |
173 | .follow_link = proc_follow_link, | |
174 | }; | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * Don't create negative dentries here, return -ENOENT by hand | |
178 | * instead. | |
179 | */ | |
e9720acd PE |
180 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
181 | struct dentry *dentry) | |
1da177e4 | 182 | { |
d3d009cb | 183 | struct inode *inode; |
1da177e4 | 184 | |
64a07bd8 | 185 | spin_lock(&proc_subdir_lock); |
5e971dce AD |
186 | for (de = de->subdir; de ; de = de->next) { |
187 | if (de->namelen != dentry->d_name.len) | |
188 | continue; | |
189 | if (!memcmp(dentry->d_name.name, de->name, de->namelen)) { | |
135d5655 | 190 | pde_get(de); |
5e971dce | 191 | spin_unlock(&proc_subdir_lock); |
6d1b6e4e | 192 | inode = proc_get_inode(dir->i_sb, de); |
d3d009cb AV |
193 | if (!inode) |
194 | return ERR_PTR(-ENOMEM); | |
b26d4cd3 | 195 | d_set_d_op(dentry, &simple_dentry_operations); |
d3d009cb AV |
196 | d_add(dentry, inode); |
197 | return NULL; | |
1da177e4 LT |
198 | } |
199 | } | |
64a07bd8 | 200 | spin_unlock(&proc_subdir_lock); |
d3d009cb | 201 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
202 | } |
203 | ||
e9720acd | 204 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 205 | unsigned int flags) |
e9720acd PE |
206 | { |
207 | return proc_lookup_de(PDE(dir), dir, dentry); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * This returns non-zero if at EOF, so that the /proc | |
212 | * root directory can use this and check if it should | |
213 | * continue with the <pid> entries.. | |
214 | * | |
215 | * Note that the VFS-layer doesn't care about the return | |
216 | * value of the readdir() call, as long as it's non-negative | |
217 | * for success.. | |
218 | */ | |
f0c3b509 AV |
219 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
220 | struct dir_context *ctx) | |
1da177e4 | 221 | { |
1da177e4 | 222 | int i; |
f0c3b509 AV |
223 | |
224 | if (!dir_emit_dots(file, ctx)) | |
225 | return 0; | |
226 | ||
227 | spin_lock(&proc_subdir_lock); | |
228 | de = de->subdir; | |
229 | i = ctx->pos - 2; | |
230 | for (;;) { | |
231 | if (!de) { | |
64a07bd8 | 232 | spin_unlock(&proc_subdir_lock); |
f0c3b509 AV |
233 | return 0; |
234 | } | |
235 | if (!i) | |
236 | break; | |
237 | de = de->next; | |
238 | i--; | |
1da177e4 | 239 | } |
f0c3b509 AV |
240 | |
241 | do { | |
242 | struct proc_dir_entry *next; | |
243 | pde_get(de); | |
244 | spin_unlock(&proc_subdir_lock); | |
245 | if (!dir_emit(ctx, de->name, de->namelen, | |
246 | de->low_ino, de->mode >> 12)) { | |
247 | pde_put(de); | |
248 | return 0; | |
249 | } | |
250 | spin_lock(&proc_subdir_lock); | |
251 | ctx->pos++; | |
252 | next = de->next; | |
253 | pde_put(de); | |
254 | de = next; | |
255 | } while (de); | |
256 | spin_unlock(&proc_subdir_lock); | |
fd3930f7 | 257 | return 1; |
1da177e4 LT |
258 | } |
259 | ||
f0c3b509 | 260 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 261 | { |
f0c3b509 | 262 | struct inode *inode = file_inode(file); |
e9720acd | 263 | |
f0c3b509 | 264 | return proc_readdir_de(PDE(inode), file, ctx); |
e9720acd PE |
265 | } |
266 | ||
1da177e4 LT |
267 | /* |
268 | * These are the generic /proc directory operations. They | |
269 | * use the in-memory "struct proc_dir_entry" tree to parse | |
270 | * the /proc directory. | |
271 | */ | |
00977a59 | 272 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 273 | .llseek = generic_file_llseek, |
1da177e4 | 274 | .read = generic_read_dir, |
f0c3b509 | 275 | .iterate = proc_readdir, |
1da177e4 LT |
276 | }; |
277 | ||
278 | /* | |
279 | * proc directories can do almost nothing.. | |
280 | */ | |
c5ef1c42 | 281 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 282 | .lookup = proc_lookup, |
2b579bee | 283 | .getattr = proc_getattr, |
1da177e4 LT |
284 | .setattr = proc_notify_change, |
285 | }; | |
286 | ||
287 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
288 | { | |
94413d88 | 289 | struct proc_dir_entry *tmp; |
33d6dce6 | 290 | int ret; |
1da177e4 | 291 | |
33d6dce6 EB |
292 | ret = proc_alloc_inum(&dp->low_ino); |
293 | if (ret) | |
294 | return ret; | |
64a07bd8 | 295 | |
1da177e4 | 296 | if (S_ISDIR(dp->mode)) { |
b6cdc731 AV |
297 | dp->proc_fops = &proc_dir_operations; |
298 | dp->proc_iops = &proc_dir_inode_operations; | |
1da177e4 LT |
299 | dir->nlink++; |
300 | } else if (S_ISLNK(dp->mode)) { | |
b6cdc731 | 301 | dp->proc_iops = &proc_link_inode_operations; |
1da177e4 | 302 | } else if (S_ISREG(dp->mode)) { |
3cb5bf1b | 303 | BUG_ON(dp->proc_fops == NULL); |
b6cdc731 AV |
304 | dp->proc_iops = &proc_file_inode_operations; |
305 | } else { | |
306 | WARN_ON(1); | |
307 | return -EINVAL; | |
1da177e4 | 308 | } |
99fc06df CG |
309 | |
310 | spin_lock(&proc_subdir_lock); | |
94413d88 ZR |
311 | |
312 | for (tmp = dir->subdir; tmp; tmp = tmp->next) | |
313 | if (strcmp(tmp->name, dp->name) == 0) { | |
87ebdc00 | 314 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
665020c3 | 315 | dir->name, dp->name); |
94413d88 ZR |
316 | break; |
317 | } | |
318 | ||
99fc06df CG |
319 | dp->next = dir->subdir; |
320 | dp->parent = dir; | |
321 | dir->subdir = dp; | |
322 | spin_unlock(&proc_subdir_lock); | |
323 | ||
1da177e4 LT |
324 | return 0; |
325 | } | |
326 | ||
2d3a4e36 | 327 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 328 | const char *name, |
d161a13f | 329 | umode_t mode, |
1da177e4 LT |
330 | nlink_t nlink) |
331 | { | |
332 | struct proc_dir_entry *ent = NULL; | |
333 | const char *fn = name; | |
312ec7e5 | 334 | unsigned int len; |
1da177e4 LT |
335 | |
336 | /* make sure name is valid */ | |
17baa2a2 | 337 | if (!name || !strlen(name)) |
338 | goto out; | |
1da177e4 | 339 | |
7cee4e00 | 340 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 LT |
341 | goto out; |
342 | ||
343 | /* At this point there must not be any '/' characters beyond *fn */ | |
344 | if (strchr(fn, '/')) | |
345 | goto out; | |
346 | ||
347 | len = strlen(fn); | |
348 | ||
17baa2a2 | 349 | ent = kzalloc(sizeof(struct proc_dir_entry) + len + 1, GFP_KERNEL); |
350 | if (!ent) | |
351 | goto out; | |
1da177e4 | 352 | |
09570f91 | 353 | memcpy(ent->name, fn, len + 1); |
1da177e4 LT |
354 | ent->namelen = len; |
355 | ent->mode = mode; | |
356 | ent->nlink = nlink; | |
5a622f2d | 357 | atomic_set(&ent->count, 1); |
786d7e16 | 358 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 359 | INIT_LIST_HEAD(&ent->pde_openers); |
17baa2a2 | 360 | out: |
1da177e4 LT |
361 | return ent; |
362 | } | |
363 | ||
364 | struct proc_dir_entry *proc_symlink(const char *name, | |
365 | struct proc_dir_entry *parent, const char *dest) | |
366 | { | |
367 | struct proc_dir_entry *ent; | |
368 | ||
2d3a4e36 | 369 | ent = __proc_create(&parent, name, |
1da177e4 LT |
370 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
371 | ||
372 | if (ent) { | |
373 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
374 | if (ent->data) { | |
375 | strcpy((char*)ent->data,dest); | |
376 | if (proc_register(parent, ent) < 0) { | |
377 | kfree(ent->data); | |
378 | kfree(ent); | |
379 | ent = NULL; | |
380 | } | |
381 | } else { | |
382 | kfree(ent); | |
383 | ent = NULL; | |
384 | } | |
385 | } | |
386 | return ent; | |
387 | } | |
587d4a17 | 388 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 389 | |
270b5ac2 DH |
390 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
391 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
392 | { |
393 | struct proc_dir_entry *ent; | |
394 | ||
270b5ac2 DH |
395 | if (mode == 0) |
396 | mode = S_IRUGO | S_IXUGO; | |
397 | ||
2d3a4e36 | 398 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 399 | if (ent) { |
270b5ac2 | 400 | ent->data = data; |
1da177e4 LT |
401 | if (proc_register(parent, ent) < 0) { |
402 | kfree(ent); | |
403 | ent = NULL; | |
404 | } | |
405 | } | |
406 | return ent; | |
407 | } | |
270b5ac2 | 408 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 409 | |
270b5ac2 DH |
410 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
411 | struct proc_dir_entry *parent) | |
78e92b99 | 412 | { |
270b5ac2 | 413 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 414 | } |
270b5ac2 | 415 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 416 | |
1da177e4 LT |
417 | struct proc_dir_entry *proc_mkdir(const char *name, |
418 | struct proc_dir_entry *parent) | |
419 | { | |
270b5ac2 | 420 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 421 | } |
587d4a17 | 422 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 423 | |
d161a13f | 424 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
425 | struct proc_dir_entry *parent, |
426 | const struct file_operations *proc_fops, | |
427 | void *data) | |
2d3a4e36 AD |
428 | { |
429 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
430 | if ((mode & S_IFMT) == 0) |
431 | mode |= S_IFREG; | |
2d3a4e36 | 432 | |
b6cdc731 AV |
433 | if (!S_ISREG(mode)) { |
434 | WARN_ON(1); /* use proc_mkdir() */ | |
435 | return NULL; | |
2d3a4e36 AD |
436 | } |
437 | ||
b6cdc731 AV |
438 | if ((mode & S_IALLUGO) == 0) |
439 | mode |= S_IRUGO; | |
440 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
441 | if (!pde) |
442 | goto out; | |
443 | pde->proc_fops = proc_fops; | |
59b74351 | 444 | pde->data = data; |
2d3a4e36 AD |
445 | if (proc_register(parent, pde) < 0) |
446 | goto out_free; | |
447 | return pde; | |
448 | out_free: | |
449 | kfree(pde); | |
450 | out: | |
451 | return NULL; | |
452 | } | |
587d4a17 | 453 | EXPORT_SYMBOL(proc_create_data); |
271a15ea DH |
454 | |
455 | void proc_set_size(struct proc_dir_entry *de, loff_t size) | |
456 | { | |
457 | de->size = size; | |
458 | } | |
459 | EXPORT_SYMBOL(proc_set_size); | |
460 | ||
461 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
462 | { | |
463 | de->uid = uid; | |
464 | de->gid = gid; | |
465 | } | |
466 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 467 | |
135d5655 | 468 | static void free_proc_entry(struct proc_dir_entry *de) |
1da177e4 | 469 | { |
33d6dce6 | 470 | proc_free_inum(de->low_ino); |
1da177e4 | 471 | |
fd2cbe48 | 472 | if (S_ISLNK(de->mode)) |
1da177e4 LT |
473 | kfree(de->data); |
474 | kfree(de); | |
475 | } | |
476 | ||
135d5655 AD |
477 | void pde_put(struct proc_dir_entry *pde) |
478 | { | |
479 | if (atomic_dec_and_test(&pde->count)) | |
480 | free_proc_entry(pde); | |
481 | } | |
482 | ||
8ce584c7 AV |
483 | /* |
484 | * Remove a /proc entry and free it if it's not currently in use. | |
485 | */ | |
486 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
487 | { | |
488 | struct proc_dir_entry **p; | |
489 | struct proc_dir_entry *de = NULL; | |
490 | const char *fn = name; | |
491 | unsigned int len; | |
492 | ||
493 | spin_lock(&proc_subdir_lock); | |
494 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
495 | spin_unlock(&proc_subdir_lock); | |
496 | return; | |
497 | } | |
498 | len = strlen(fn); | |
499 | ||
500 | for (p = &parent->subdir; *p; p=&(*p)->next ) { | |
501 | if (proc_match(len, fn, *p)) { | |
502 | de = *p; | |
503 | *p = de->next; | |
504 | de->next = NULL; | |
505 | break; | |
506 | } | |
507 | } | |
508 | spin_unlock(&proc_subdir_lock); | |
509 | if (!de) { | |
510 | WARN(1, "name '%s'\n", name); | |
511 | return; | |
512 | } | |
513 | ||
866ad9a7 | 514 | proc_entry_rundown(de); |
881adb85 | 515 | |
f649d6d3 AD |
516 | if (S_ISDIR(de->mode)) |
517 | parent->nlink--; | |
518 | de->nlink = 0; | |
87ebdc00 AM |
519 | WARN(de->subdir, "%s: removing non-empty directory " |
520 | "'%s/%s', leaking at least '%s'\n", __func__, | |
521 | de->parent->name, de->name, de->subdir->name); | |
135d5655 | 522 | pde_put(de); |
1da177e4 | 523 | } |
587d4a17 | 524 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
525 | |
526 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
527 | { | |
528 | struct proc_dir_entry **p; | |
529 | struct proc_dir_entry *root = NULL, *de, *next; | |
530 | const char *fn = name; | |
531 | unsigned int len; | |
532 | ||
533 | spin_lock(&proc_subdir_lock); | |
534 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
535 | spin_unlock(&proc_subdir_lock); | |
536 | return -ENOENT; | |
537 | } | |
538 | len = strlen(fn); | |
539 | ||
540 | for (p = &parent->subdir; *p; p=&(*p)->next ) { | |
541 | if (proc_match(len, fn, *p)) { | |
542 | root = *p; | |
543 | *p = root->next; | |
544 | root->next = NULL; | |
545 | break; | |
546 | } | |
547 | } | |
548 | if (!root) { | |
549 | spin_unlock(&proc_subdir_lock); | |
550 | return -ENOENT; | |
551 | } | |
552 | de = root; | |
553 | while (1) { | |
554 | next = de->subdir; | |
555 | if (next) { | |
556 | de->subdir = next->next; | |
557 | next->next = NULL; | |
558 | de = next; | |
559 | continue; | |
560 | } | |
561 | spin_unlock(&proc_subdir_lock); | |
562 | ||
866ad9a7 | 563 | proc_entry_rundown(de); |
8ce584c7 AV |
564 | next = de->parent; |
565 | if (S_ISDIR(de->mode)) | |
566 | next->nlink--; | |
567 | de->nlink = 0; | |
568 | if (de == root) | |
569 | break; | |
570 | pde_put(de); | |
571 | ||
572 | spin_lock(&proc_subdir_lock); | |
573 | de = next; | |
574 | } | |
575 | pde_put(root); | |
576 | return 0; | |
577 | } | |
578 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
579 | |
580 | void *proc_get_parent_data(const struct inode *inode) | |
581 | { | |
582 | struct proc_dir_entry *de = PDE(inode); | |
583 | return de->parent->data; | |
584 | } | |
585 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
586 | |
587 | void proc_remove(struct proc_dir_entry *de) | |
588 | { | |
589 | if (de) | |
590 | remove_proc_subtree(de->name, de->parent); | |
591 | } | |
592 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
593 | |
594 | void *PDE_DATA(const struct inode *inode) | |
595 | { | |
596 | return __PDE_DATA(inode); | |
597 | } | |
598 | EXPORT_SYMBOL(PDE_DATA); |