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 | |
1da177e4 LT |
52 | de->uid = inode->i_uid; |
53 | de->gid = inode->i_gid; | |
54 | de->mode = inode->i_mode; | |
1025774c | 55 | return 0; |
1da177e4 LT |
56 | } |
57 | ||
2b579bee MS |
58 | static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry, |
59 | struct kstat *stat) | |
60 | { | |
61 | struct inode *inode = dentry->d_inode; | |
62 | struct proc_dir_entry *de = PROC_I(inode)->pde; | |
63 | if (de && de->nlink) | |
bfe86848 | 64 | set_nlink(inode, de->nlink); |
2b579bee MS |
65 | |
66 | generic_fillattr(inode, stat); | |
67 | return 0; | |
68 | } | |
69 | ||
c5ef1c42 | 70 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
71 | .setattr = proc_notify_change, |
72 | }; | |
73 | ||
74 | /* | |
75 | * This function parses a name such as "tty/driver/serial", and | |
76 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
77 | * returns "serial" in residual. | |
78 | */ | |
e17a5765 AD |
79 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
80 | const char **residual) | |
1da177e4 LT |
81 | { |
82 | const char *cp = name, *next; | |
83 | struct proc_dir_entry *de; | |
312ec7e5 | 84 | unsigned int len; |
1da177e4 | 85 | |
7cee4e00 AD |
86 | de = *ret; |
87 | if (!de) | |
88 | de = &proc_root; | |
89 | ||
1da177e4 LT |
90 | while (1) { |
91 | next = strchr(cp, '/'); | |
92 | if (!next) | |
93 | break; | |
94 | ||
95 | len = next - cp; | |
96 | for (de = de->subdir; de ; de = de->next) { | |
97 | if (proc_match(len, cp, de)) | |
98 | break; | |
99 | } | |
12bac0d9 AD |
100 | if (!de) { |
101 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 102 | return -ENOENT; |
12bac0d9 | 103 | } |
1da177e4 LT |
104 | cp += len + 1; |
105 | } | |
106 | *residual = cp; | |
107 | *ret = de; | |
e17a5765 AD |
108 | return 0; |
109 | } | |
110 | ||
111 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
112 | const char **residual) | |
113 | { | |
114 | int rv; | |
115 | ||
116 | spin_lock(&proc_subdir_lock); | |
117 | rv = __xlate_proc_name(name, ret, residual); | |
64a07bd8 | 118 | spin_unlock(&proc_subdir_lock); |
e17a5765 | 119 | return rv; |
1da177e4 LT |
120 | } |
121 | ||
9a185409 | 122 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 LT |
123 | static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */ |
124 | ||
67935df4 | 125 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
126 | |
127 | /* | |
128 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
129 | * 0xffffffff, or zero on failure. | |
130 | */ | |
33d6dce6 | 131 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 132 | { |
67935df4 | 133 | unsigned int i; |
1da177e4 LT |
134 | int error; |
135 | ||
136 | retry: | |
33d6dce6 EB |
137 | if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) |
138 | return -ENOMEM; | |
1da177e4 | 139 | |
dfb2ea45 | 140 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 141 | error = ida_get_new(&proc_inum_ida, &i); |
dfb2ea45 | 142 | spin_unlock_irq(&proc_inum_lock); |
1da177e4 LT |
143 | if (error == -EAGAIN) |
144 | goto retry; | |
145 | else if (error) | |
33d6dce6 | 146 | return error; |
1da177e4 | 147 | |
67935df4 | 148 | if (i > UINT_MAX - PROC_DYNAMIC_FIRST) { |
dfb2ea45 | 149 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 150 | ida_remove(&proc_inum_ida, i); |
dfb2ea45 | 151 | spin_unlock_irq(&proc_inum_lock); |
33d6dce6 | 152 | return -ENOSPC; |
67935df4 | 153 | } |
33d6dce6 EB |
154 | *inum = PROC_DYNAMIC_FIRST + i; |
155 | return 0; | |
1da177e4 LT |
156 | } |
157 | ||
33d6dce6 | 158 | void proc_free_inum(unsigned int inum) |
1da177e4 | 159 | { |
dfb2ea45 EB |
160 | unsigned long flags; |
161 | spin_lock_irqsave(&proc_inum_lock, flags); | |
9a185409 | 162 | ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
dfb2ea45 | 163 | spin_unlock_irqrestore(&proc_inum_lock, flags); |
1da177e4 LT |
164 | } |
165 | ||
008b150a | 166 | static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 167 | { |
c30480b9 | 168 | nd_set_link(nd, __PDE_DATA(dentry->d_inode)); |
008b150a | 169 | return NULL; |
1da177e4 LT |
170 | } |
171 | ||
c5ef1c42 | 172 | static const struct inode_operations proc_link_inode_operations = { |
1da177e4 LT |
173 | .readlink = generic_readlink, |
174 | .follow_link = proc_follow_link, | |
175 | }; | |
176 | ||
177 | /* | |
178 | * As some entries in /proc are volatile, we want to | |
179 | * get rid of unused dentries. This could be made | |
180 | * smarter: we could keep a "volatile" flag in the | |
181 | * inode to indicate which ones to keep. | |
182 | */ | |
fe15ce44 | 183 | static int proc_delete_dentry(const struct dentry * dentry) |
1da177e4 LT |
184 | { |
185 | return 1; | |
186 | } | |
187 | ||
d72f71eb | 188 | static const struct dentry_operations proc_dentry_operations = |
1da177e4 LT |
189 | { |
190 | .d_delete = proc_delete_dentry, | |
191 | }; | |
192 | ||
193 | /* | |
194 | * Don't create negative dentries here, return -ENOENT by hand | |
195 | * instead. | |
196 | */ | |
e9720acd PE |
197 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
198 | struct dentry *dentry) | |
1da177e4 | 199 | { |
d3d009cb | 200 | struct inode *inode; |
1da177e4 | 201 | |
64a07bd8 | 202 | spin_lock(&proc_subdir_lock); |
5e971dce AD |
203 | for (de = de->subdir; de ; de = de->next) { |
204 | if (de->namelen != dentry->d_name.len) | |
205 | continue; | |
206 | if (!memcmp(dentry->d_name.name, de->name, de->namelen)) { | |
135d5655 | 207 | pde_get(de); |
5e971dce | 208 | spin_unlock(&proc_subdir_lock); |
6d1b6e4e | 209 | inode = proc_get_inode(dir->i_sb, de); |
d3d009cb AV |
210 | if (!inode) |
211 | return ERR_PTR(-ENOMEM); | |
212 | d_set_d_op(dentry, &proc_dentry_operations); | |
213 | d_add(dentry, inode); | |
214 | return NULL; | |
1da177e4 LT |
215 | } |
216 | } | |
64a07bd8 | 217 | spin_unlock(&proc_subdir_lock); |
d3d009cb | 218 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
219 | } |
220 | ||
e9720acd | 221 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 222 | unsigned int flags) |
e9720acd PE |
223 | { |
224 | return proc_lookup_de(PDE(dir), dir, dentry); | |
225 | } | |
226 | ||
1da177e4 LT |
227 | /* |
228 | * This returns non-zero if at EOF, so that the /proc | |
229 | * root directory can use this and check if it should | |
230 | * continue with the <pid> entries.. | |
231 | * | |
232 | * Note that the VFS-layer doesn't care about the return | |
233 | * value of the readdir() call, as long as it's non-negative | |
234 | * for success.. | |
235 | */ | |
f0c3b509 AV |
236 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
237 | struct dir_context *ctx) | |
1da177e4 | 238 | { |
1da177e4 | 239 | int i; |
f0c3b509 AV |
240 | |
241 | if (!dir_emit_dots(file, ctx)) | |
242 | return 0; | |
243 | ||
244 | spin_lock(&proc_subdir_lock); | |
245 | de = de->subdir; | |
246 | i = ctx->pos - 2; | |
247 | for (;;) { | |
248 | if (!de) { | |
64a07bd8 | 249 | spin_unlock(&proc_subdir_lock); |
f0c3b509 AV |
250 | return 0; |
251 | } | |
252 | if (!i) | |
253 | break; | |
254 | de = de->next; | |
255 | i--; | |
1da177e4 | 256 | } |
f0c3b509 AV |
257 | |
258 | do { | |
259 | struct proc_dir_entry *next; | |
260 | pde_get(de); | |
261 | spin_unlock(&proc_subdir_lock); | |
262 | if (!dir_emit(ctx, de->name, de->namelen, | |
263 | de->low_ino, de->mode >> 12)) { | |
264 | pde_put(de); | |
265 | return 0; | |
266 | } | |
267 | spin_lock(&proc_subdir_lock); | |
268 | ctx->pos++; | |
269 | next = de->next; | |
270 | pde_put(de); | |
271 | de = next; | |
272 | } while (de); | |
273 | spin_unlock(&proc_subdir_lock); | |
fd3930f7 | 274 | return 1; |
1da177e4 LT |
275 | } |
276 | ||
f0c3b509 | 277 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 278 | { |
f0c3b509 | 279 | struct inode *inode = file_inode(file); |
e9720acd | 280 | |
f0c3b509 | 281 | return proc_readdir_de(PDE(inode), file, ctx); |
e9720acd PE |
282 | } |
283 | ||
1da177e4 LT |
284 | /* |
285 | * These are the generic /proc directory operations. They | |
286 | * use the in-memory "struct proc_dir_entry" tree to parse | |
287 | * the /proc directory. | |
288 | */ | |
00977a59 | 289 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 290 | .llseek = generic_file_llseek, |
1da177e4 | 291 | .read = generic_read_dir, |
f0c3b509 | 292 | .iterate = proc_readdir, |
1da177e4 LT |
293 | }; |
294 | ||
295 | /* | |
296 | * proc directories can do almost nothing.. | |
297 | */ | |
c5ef1c42 | 298 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 299 | .lookup = proc_lookup, |
2b579bee | 300 | .getattr = proc_getattr, |
1da177e4 LT |
301 | .setattr = proc_notify_change, |
302 | }; | |
303 | ||
304 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
305 | { | |
94413d88 | 306 | struct proc_dir_entry *tmp; |
33d6dce6 | 307 | int ret; |
1da177e4 | 308 | |
33d6dce6 EB |
309 | ret = proc_alloc_inum(&dp->low_ino); |
310 | if (ret) | |
311 | return ret; | |
64a07bd8 | 312 | |
1da177e4 | 313 | if (S_ISDIR(dp->mode)) { |
b6cdc731 AV |
314 | dp->proc_fops = &proc_dir_operations; |
315 | dp->proc_iops = &proc_dir_inode_operations; | |
1da177e4 LT |
316 | dir->nlink++; |
317 | } else if (S_ISLNK(dp->mode)) { | |
b6cdc731 | 318 | dp->proc_iops = &proc_link_inode_operations; |
1da177e4 | 319 | } else if (S_ISREG(dp->mode)) { |
3cb5bf1b | 320 | BUG_ON(dp->proc_fops == NULL); |
b6cdc731 AV |
321 | dp->proc_iops = &proc_file_inode_operations; |
322 | } else { | |
323 | WARN_ON(1); | |
324 | return -EINVAL; | |
1da177e4 | 325 | } |
99fc06df CG |
326 | |
327 | spin_lock(&proc_subdir_lock); | |
94413d88 ZR |
328 | |
329 | for (tmp = dir->subdir; tmp; tmp = tmp->next) | |
330 | if (strcmp(tmp->name, dp->name) == 0) { | |
87ebdc00 | 331 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
665020c3 | 332 | dir->name, dp->name); |
94413d88 ZR |
333 | break; |
334 | } | |
335 | ||
99fc06df CG |
336 | dp->next = dir->subdir; |
337 | dp->parent = dir; | |
338 | dir->subdir = dp; | |
339 | spin_unlock(&proc_subdir_lock); | |
340 | ||
1da177e4 LT |
341 | return 0; |
342 | } | |
343 | ||
2d3a4e36 | 344 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 345 | const char *name, |
d161a13f | 346 | umode_t mode, |
1da177e4 LT |
347 | nlink_t nlink) |
348 | { | |
349 | struct proc_dir_entry *ent = NULL; | |
350 | const char *fn = name; | |
312ec7e5 | 351 | unsigned int len; |
1da177e4 LT |
352 | |
353 | /* make sure name is valid */ | |
17baa2a2 | 354 | if (!name || !strlen(name)) |
355 | goto out; | |
1da177e4 | 356 | |
7cee4e00 | 357 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 LT |
358 | goto out; |
359 | ||
360 | /* At this point there must not be any '/' characters beyond *fn */ | |
361 | if (strchr(fn, '/')) | |
362 | goto out; | |
363 | ||
364 | len = strlen(fn); | |
365 | ||
17baa2a2 | 366 | ent = kzalloc(sizeof(struct proc_dir_entry) + len + 1, GFP_KERNEL); |
367 | if (!ent) | |
368 | goto out; | |
1da177e4 | 369 | |
09570f91 | 370 | memcpy(ent->name, fn, len + 1); |
1da177e4 LT |
371 | ent->namelen = len; |
372 | ent->mode = mode; | |
373 | ent->nlink = nlink; | |
5a622f2d | 374 | atomic_set(&ent->count, 1); |
786d7e16 | 375 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 376 | INIT_LIST_HEAD(&ent->pde_openers); |
17baa2a2 | 377 | out: |
1da177e4 LT |
378 | return ent; |
379 | } | |
380 | ||
381 | struct proc_dir_entry *proc_symlink(const char *name, | |
382 | struct proc_dir_entry *parent, const char *dest) | |
383 | { | |
384 | struct proc_dir_entry *ent; | |
385 | ||
2d3a4e36 | 386 | ent = __proc_create(&parent, name, |
1da177e4 LT |
387 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
388 | ||
389 | if (ent) { | |
390 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
391 | if (ent->data) { | |
392 | strcpy((char*)ent->data,dest); | |
393 | if (proc_register(parent, ent) < 0) { | |
394 | kfree(ent->data); | |
395 | kfree(ent); | |
396 | ent = NULL; | |
397 | } | |
398 | } else { | |
399 | kfree(ent); | |
400 | ent = NULL; | |
401 | } | |
402 | } | |
403 | return ent; | |
404 | } | |
587d4a17 | 405 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 406 | |
270b5ac2 DH |
407 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
408 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
409 | { |
410 | struct proc_dir_entry *ent; | |
411 | ||
270b5ac2 DH |
412 | if (mode == 0) |
413 | mode = S_IRUGO | S_IXUGO; | |
414 | ||
2d3a4e36 | 415 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 416 | if (ent) { |
270b5ac2 | 417 | ent->data = data; |
1da177e4 LT |
418 | if (proc_register(parent, ent) < 0) { |
419 | kfree(ent); | |
420 | ent = NULL; | |
421 | } | |
422 | } | |
423 | return ent; | |
424 | } | |
270b5ac2 | 425 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 426 | |
270b5ac2 DH |
427 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
428 | struct proc_dir_entry *parent) | |
78e92b99 | 429 | { |
270b5ac2 | 430 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 431 | } |
270b5ac2 | 432 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 433 | |
1da177e4 LT |
434 | struct proc_dir_entry *proc_mkdir(const char *name, |
435 | struct proc_dir_entry *parent) | |
436 | { | |
270b5ac2 | 437 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 438 | } |
587d4a17 | 439 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 440 | |
d161a13f | 441 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
442 | struct proc_dir_entry *parent, |
443 | const struct file_operations *proc_fops, | |
444 | void *data) | |
2d3a4e36 AD |
445 | { |
446 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
447 | if ((mode & S_IFMT) == 0) |
448 | mode |= S_IFREG; | |
2d3a4e36 | 449 | |
b6cdc731 AV |
450 | if (!S_ISREG(mode)) { |
451 | WARN_ON(1); /* use proc_mkdir() */ | |
452 | return NULL; | |
2d3a4e36 AD |
453 | } |
454 | ||
b6cdc731 AV |
455 | if ((mode & S_IALLUGO) == 0) |
456 | mode |= S_IRUGO; | |
457 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
458 | if (!pde) |
459 | goto out; | |
460 | pde->proc_fops = proc_fops; | |
59b74351 | 461 | pde->data = data; |
2d3a4e36 AD |
462 | if (proc_register(parent, pde) < 0) |
463 | goto out_free; | |
464 | return pde; | |
465 | out_free: | |
466 | kfree(pde); | |
467 | out: | |
468 | return NULL; | |
469 | } | |
587d4a17 | 470 | EXPORT_SYMBOL(proc_create_data); |
271a15ea DH |
471 | |
472 | void proc_set_size(struct proc_dir_entry *de, loff_t size) | |
473 | { | |
474 | de->size = size; | |
475 | } | |
476 | EXPORT_SYMBOL(proc_set_size); | |
477 | ||
478 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
479 | { | |
480 | de->uid = uid; | |
481 | de->gid = gid; | |
482 | } | |
483 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 484 | |
135d5655 | 485 | static void free_proc_entry(struct proc_dir_entry *de) |
1da177e4 | 486 | { |
33d6dce6 | 487 | proc_free_inum(de->low_ino); |
1da177e4 | 488 | |
fd2cbe48 | 489 | if (S_ISLNK(de->mode)) |
1da177e4 LT |
490 | kfree(de->data); |
491 | kfree(de); | |
492 | } | |
493 | ||
135d5655 AD |
494 | void pde_put(struct proc_dir_entry *pde) |
495 | { | |
496 | if (atomic_dec_and_test(&pde->count)) | |
497 | free_proc_entry(pde); | |
498 | } | |
499 | ||
8ce584c7 AV |
500 | /* |
501 | * Remove a /proc entry and free it if it's not currently in use. | |
502 | */ | |
503 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
504 | { | |
505 | struct proc_dir_entry **p; | |
506 | struct proc_dir_entry *de = NULL; | |
507 | const char *fn = name; | |
508 | unsigned int len; | |
509 | ||
510 | spin_lock(&proc_subdir_lock); | |
511 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
512 | spin_unlock(&proc_subdir_lock); | |
513 | return; | |
514 | } | |
515 | len = strlen(fn); | |
516 | ||
517 | for (p = &parent->subdir; *p; p=&(*p)->next ) { | |
518 | if (proc_match(len, fn, *p)) { | |
519 | de = *p; | |
520 | *p = de->next; | |
521 | de->next = NULL; | |
522 | break; | |
523 | } | |
524 | } | |
525 | spin_unlock(&proc_subdir_lock); | |
526 | if (!de) { | |
527 | WARN(1, "name '%s'\n", name); | |
528 | return; | |
529 | } | |
530 | ||
866ad9a7 | 531 | proc_entry_rundown(de); |
881adb85 | 532 | |
f649d6d3 AD |
533 | if (S_ISDIR(de->mode)) |
534 | parent->nlink--; | |
535 | de->nlink = 0; | |
87ebdc00 AM |
536 | WARN(de->subdir, "%s: removing non-empty directory " |
537 | "'%s/%s', leaking at least '%s'\n", __func__, | |
538 | de->parent->name, de->name, de->subdir->name); | |
135d5655 | 539 | pde_put(de); |
1da177e4 | 540 | } |
587d4a17 | 541 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
542 | |
543 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
544 | { | |
545 | struct proc_dir_entry **p; | |
546 | struct proc_dir_entry *root = NULL, *de, *next; | |
547 | const char *fn = name; | |
548 | unsigned int len; | |
549 | ||
550 | spin_lock(&proc_subdir_lock); | |
551 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
552 | spin_unlock(&proc_subdir_lock); | |
553 | return -ENOENT; | |
554 | } | |
555 | len = strlen(fn); | |
556 | ||
557 | for (p = &parent->subdir; *p; p=&(*p)->next ) { | |
558 | if (proc_match(len, fn, *p)) { | |
559 | root = *p; | |
560 | *p = root->next; | |
561 | root->next = NULL; | |
562 | break; | |
563 | } | |
564 | } | |
565 | if (!root) { | |
566 | spin_unlock(&proc_subdir_lock); | |
567 | return -ENOENT; | |
568 | } | |
569 | de = root; | |
570 | while (1) { | |
571 | next = de->subdir; | |
572 | if (next) { | |
573 | de->subdir = next->next; | |
574 | next->next = NULL; | |
575 | de = next; | |
576 | continue; | |
577 | } | |
578 | spin_unlock(&proc_subdir_lock); | |
579 | ||
866ad9a7 | 580 | proc_entry_rundown(de); |
8ce584c7 AV |
581 | next = de->parent; |
582 | if (S_ISDIR(de->mode)) | |
583 | next->nlink--; | |
584 | de->nlink = 0; | |
585 | if (de == root) | |
586 | break; | |
587 | pde_put(de); | |
588 | ||
589 | spin_lock(&proc_subdir_lock); | |
590 | de = next; | |
591 | } | |
592 | pde_put(root); | |
593 | return 0; | |
594 | } | |
595 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
596 | |
597 | void *proc_get_parent_data(const struct inode *inode) | |
598 | { | |
599 | struct proc_dir_entry *de = PDE(inode); | |
600 | return de->parent->data; | |
601 | } | |
602 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
603 | |
604 | void proc_remove(struct proc_dir_entry *de) | |
605 | { | |
606 | if (de) | |
607 | remove_proc_subtree(de->name, de->parent); | |
608 | } | |
609 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
610 | |
611 | void *PDE_DATA(const struct inode *inode) | |
612 | { | |
613 | return __PDE_DATA(inode); | |
614 | } | |
615 | EXPORT_SYMBOL(PDE_DATA); |