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 | ||
4dcc03fc | 30 | static DEFINE_SPINLOCK(proc_subdir_lock); |
64a07bd8 | 31 | |
312ec7e5 | 32 | static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de) |
1da177e4 | 33 | { |
710585d4 ND |
34 | if (len < de->namelen) |
35 | return -1; | |
36 | if (len > de->namelen) | |
37 | return 1; | |
38 | ||
39 | return memcmp(name, de->name, len); | |
40 | } | |
41 | ||
42 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) | |
43 | { | |
2fc1e948 ND |
44 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
45 | subdir_node); | |
710585d4 ND |
46 | } |
47 | ||
48 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) | |
49 | { | |
2fc1e948 ND |
50 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
51 | subdir_node); | |
710585d4 ND |
52 | } |
53 | ||
54 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, | |
55 | const char *name, | |
56 | unsigned int len) | |
57 | { | |
58 | struct rb_node *node = dir->subdir.rb_node; | |
59 | ||
60 | while (node) { | |
61 | struct proc_dir_entry *de = container_of(node, | |
62 | struct proc_dir_entry, | |
63 | subdir_node); | |
64 | int result = proc_match(len, name, de); | |
65 | ||
66 | if (result < 0) | |
67 | node = node->rb_left; | |
68 | else if (result > 0) | |
69 | node = node->rb_right; | |
70 | else | |
71 | return de; | |
72 | } | |
73 | return NULL; | |
74 | } | |
75 | ||
76 | static bool pde_subdir_insert(struct proc_dir_entry *dir, | |
77 | struct proc_dir_entry *de) | |
78 | { | |
79 | struct rb_root *root = &dir->subdir; | |
80 | struct rb_node **new = &root->rb_node, *parent = NULL; | |
81 | ||
82 | /* Figure out where to put new node */ | |
83 | while (*new) { | |
84 | struct proc_dir_entry *this = | |
85 | container_of(*new, struct proc_dir_entry, subdir_node); | |
86 | int result = proc_match(de->namelen, de->name, this); | |
87 | ||
88 | parent = *new; | |
89 | if (result < 0) | |
90 | new = &(*new)->rb_left; | |
91 | else if (result > 0) | |
92 | new = &(*new)->rb_right; | |
93 | else | |
94 | return false; | |
95 | } | |
96 | ||
97 | /* Add new node and rebalance tree. */ | |
98 | rb_link_node(&de->subdir_node, parent, new); | |
99 | rb_insert_color(&de->subdir_node, root); | |
100 | return true; | |
1da177e4 LT |
101 | } |
102 | ||
1da177e4 LT |
103 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
104 | { | |
105 | struct inode *inode = dentry->d_inode; | |
106 | struct proc_dir_entry *de = PDE(inode); | |
107 | int error; | |
108 | ||
109 | error = inode_change_ok(inode, iattr); | |
110 | if (error) | |
1025774c | 111 | return error; |
1da177e4 | 112 | |
1025774c CH |
113 | setattr_copy(inode, iattr); |
114 | mark_inode_dirty(inode); | |
46f69557 | 115 | |
cdf7e8dd | 116 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 117 | de->mode = inode->i_mode; |
1025774c | 118 | return 0; |
1da177e4 LT |
119 | } |
120 | ||
2b579bee MS |
121 | static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry, |
122 | struct kstat *stat) | |
123 | { | |
124 | struct inode *inode = dentry->d_inode; | |
6bee55f9 | 125 | struct proc_dir_entry *de = PDE(inode); |
2b579bee | 126 | if (de && de->nlink) |
bfe86848 | 127 | set_nlink(inode, de->nlink); |
2b579bee MS |
128 | |
129 | generic_fillattr(inode, stat); | |
130 | return 0; | |
131 | } | |
132 | ||
c5ef1c42 | 133 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
134 | .setattr = proc_notify_change, |
135 | }; | |
136 | ||
137 | /* | |
138 | * This function parses a name such as "tty/driver/serial", and | |
139 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
140 | * returns "serial" in residual. | |
141 | */ | |
e17a5765 AD |
142 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
143 | const char **residual) | |
1da177e4 LT |
144 | { |
145 | const char *cp = name, *next; | |
146 | struct proc_dir_entry *de; | |
312ec7e5 | 147 | unsigned int len; |
1da177e4 | 148 | |
7cee4e00 AD |
149 | de = *ret; |
150 | if (!de) | |
151 | de = &proc_root; | |
152 | ||
1da177e4 LT |
153 | while (1) { |
154 | next = strchr(cp, '/'); | |
155 | if (!next) | |
156 | break; | |
157 | ||
158 | len = next - cp; | |
710585d4 | 159 | de = pde_subdir_find(de, cp, len); |
12bac0d9 AD |
160 | if (!de) { |
161 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 162 | return -ENOENT; |
12bac0d9 | 163 | } |
1da177e4 LT |
164 | cp += len + 1; |
165 | } | |
166 | *residual = cp; | |
167 | *ret = de; | |
e17a5765 AD |
168 | return 0; |
169 | } | |
170 | ||
171 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
172 | const char **residual) | |
173 | { | |
174 | int rv; | |
175 | ||
176 | spin_lock(&proc_subdir_lock); | |
177 | rv = __xlate_proc_name(name, ret, residual); | |
64a07bd8 | 178 | spin_unlock(&proc_subdir_lock); |
e17a5765 | 179 | return rv; |
1da177e4 LT |
180 | } |
181 | ||
9a185409 | 182 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 LT |
183 | static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */ |
184 | ||
67935df4 | 185 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
186 | |
187 | /* | |
188 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
189 | * 0xffffffff, or zero on failure. | |
190 | */ | |
33d6dce6 | 191 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 192 | { |
67935df4 | 193 | unsigned int i; |
1da177e4 LT |
194 | int error; |
195 | ||
196 | retry: | |
33d6dce6 EB |
197 | if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) |
198 | return -ENOMEM; | |
1da177e4 | 199 | |
dfb2ea45 | 200 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 201 | error = ida_get_new(&proc_inum_ida, &i); |
dfb2ea45 | 202 | spin_unlock_irq(&proc_inum_lock); |
1da177e4 LT |
203 | if (error == -EAGAIN) |
204 | goto retry; | |
205 | else if (error) | |
33d6dce6 | 206 | return error; |
1da177e4 | 207 | |
67935df4 | 208 | if (i > UINT_MAX - PROC_DYNAMIC_FIRST) { |
dfb2ea45 | 209 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 210 | ida_remove(&proc_inum_ida, i); |
dfb2ea45 | 211 | spin_unlock_irq(&proc_inum_lock); |
33d6dce6 | 212 | return -ENOSPC; |
67935df4 | 213 | } |
33d6dce6 EB |
214 | *inum = PROC_DYNAMIC_FIRST + i; |
215 | return 0; | |
1da177e4 LT |
216 | } |
217 | ||
33d6dce6 | 218 | void proc_free_inum(unsigned int inum) |
1da177e4 | 219 | { |
dfb2ea45 EB |
220 | unsigned long flags; |
221 | spin_lock_irqsave(&proc_inum_lock, flags); | |
9a185409 | 222 | ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
dfb2ea45 | 223 | spin_unlock_irqrestore(&proc_inum_lock, flags); |
1da177e4 LT |
224 | } |
225 | ||
008b150a | 226 | static void *proc_follow_link(struct dentry *dentry, struct nameidata *nd) |
1da177e4 | 227 | { |
c30480b9 | 228 | nd_set_link(nd, __PDE_DATA(dentry->d_inode)); |
008b150a | 229 | return NULL; |
1da177e4 LT |
230 | } |
231 | ||
c5ef1c42 | 232 | static const struct inode_operations proc_link_inode_operations = { |
1da177e4 LT |
233 | .readlink = generic_readlink, |
234 | .follow_link = proc_follow_link, | |
235 | }; | |
236 | ||
1da177e4 LT |
237 | /* |
238 | * Don't create negative dentries here, return -ENOENT by hand | |
239 | * instead. | |
240 | */ | |
e9720acd PE |
241 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
242 | struct dentry *dentry) | |
1da177e4 | 243 | { |
d3d009cb | 244 | struct inode *inode; |
1da177e4 | 245 | |
64a07bd8 | 246 | spin_lock(&proc_subdir_lock); |
710585d4 ND |
247 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
248 | if (de) { | |
249 | pde_get(de); | |
250 | spin_unlock(&proc_subdir_lock); | |
251 | inode = proc_get_inode(dir->i_sb, de); | |
252 | if (!inode) | |
253 | return ERR_PTR(-ENOMEM); | |
254 | d_set_d_op(dentry, &simple_dentry_operations); | |
255 | d_add(dentry, inode); | |
256 | return NULL; | |
1da177e4 | 257 | } |
64a07bd8 | 258 | spin_unlock(&proc_subdir_lock); |
d3d009cb | 259 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
260 | } |
261 | ||
e9720acd | 262 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 263 | unsigned int flags) |
e9720acd PE |
264 | { |
265 | return proc_lookup_de(PDE(dir), dir, dentry); | |
266 | } | |
267 | ||
1da177e4 LT |
268 | /* |
269 | * This returns non-zero if at EOF, so that the /proc | |
270 | * root directory can use this and check if it should | |
271 | * continue with the <pid> entries.. | |
272 | * | |
273 | * Note that the VFS-layer doesn't care about the return | |
274 | * value of the readdir() call, as long as it's non-negative | |
275 | * for success.. | |
276 | */ | |
f0c3b509 AV |
277 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
278 | struct dir_context *ctx) | |
1da177e4 | 279 | { |
1da177e4 | 280 | int i; |
f0c3b509 AV |
281 | |
282 | if (!dir_emit_dots(file, ctx)) | |
283 | return 0; | |
284 | ||
285 | spin_lock(&proc_subdir_lock); | |
710585d4 | 286 | de = pde_subdir_first(de); |
f0c3b509 AV |
287 | i = ctx->pos - 2; |
288 | for (;;) { | |
289 | if (!de) { | |
64a07bd8 | 290 | spin_unlock(&proc_subdir_lock); |
f0c3b509 AV |
291 | return 0; |
292 | } | |
293 | if (!i) | |
294 | break; | |
710585d4 | 295 | de = pde_subdir_next(de); |
f0c3b509 | 296 | i--; |
1da177e4 | 297 | } |
f0c3b509 AV |
298 | |
299 | do { | |
300 | struct proc_dir_entry *next; | |
301 | pde_get(de); | |
302 | spin_unlock(&proc_subdir_lock); | |
303 | if (!dir_emit(ctx, de->name, de->namelen, | |
304 | de->low_ino, de->mode >> 12)) { | |
305 | pde_put(de); | |
306 | return 0; | |
307 | } | |
308 | spin_lock(&proc_subdir_lock); | |
309 | ctx->pos++; | |
710585d4 | 310 | next = pde_subdir_next(de); |
f0c3b509 AV |
311 | pde_put(de); |
312 | de = next; | |
313 | } while (de); | |
314 | spin_unlock(&proc_subdir_lock); | |
fd3930f7 | 315 | return 1; |
1da177e4 LT |
316 | } |
317 | ||
f0c3b509 | 318 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 319 | { |
f0c3b509 | 320 | struct inode *inode = file_inode(file); |
e9720acd | 321 | |
f0c3b509 | 322 | return proc_readdir_de(PDE(inode), file, ctx); |
e9720acd PE |
323 | } |
324 | ||
1da177e4 LT |
325 | /* |
326 | * These are the generic /proc directory operations. They | |
327 | * use the in-memory "struct proc_dir_entry" tree to parse | |
328 | * the /proc directory. | |
329 | */ | |
00977a59 | 330 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 331 | .llseek = generic_file_llseek, |
1da177e4 | 332 | .read = generic_read_dir, |
f0c3b509 | 333 | .iterate = proc_readdir, |
1da177e4 LT |
334 | }; |
335 | ||
336 | /* | |
337 | * proc directories can do almost nothing.. | |
338 | */ | |
c5ef1c42 | 339 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 340 | .lookup = proc_lookup, |
2b579bee | 341 | .getattr = proc_getattr, |
1da177e4 LT |
342 | .setattr = proc_notify_change, |
343 | }; | |
344 | ||
345 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
346 | { | |
33d6dce6 | 347 | int ret; |
710585d4 | 348 | |
33d6dce6 EB |
349 | ret = proc_alloc_inum(&dp->low_ino); |
350 | if (ret) | |
351 | return ret; | |
64a07bd8 | 352 | |
99fc06df | 353 | spin_lock(&proc_subdir_lock); |
99fc06df | 354 | dp->parent = dir; |
b208d54b | 355 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
356 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
357 | dir->name, dp->name); | |
b208d54b | 358 | spin_unlock(&proc_subdir_lock); |
b208d54b DB |
359 | proc_free_inum(dp->low_ino); |
360 | return -EEXIST; | |
361 | } | |
99fc06df CG |
362 | spin_unlock(&proc_subdir_lock); |
363 | ||
1da177e4 LT |
364 | return 0; |
365 | } | |
366 | ||
2d3a4e36 | 367 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 368 | const char *name, |
d161a13f | 369 | umode_t mode, |
1da177e4 LT |
370 | nlink_t nlink) |
371 | { | |
372 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
373 | const char *fn; |
374 | struct qstr qstr; | |
1da177e4 | 375 | |
7cee4e00 | 376 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 377 | goto out; |
dbcdb504 AD |
378 | qstr.name = fn; |
379 | qstr.len = strlen(fn); | |
380 | if (qstr.len == 0 || qstr.len >= 256) { | |
381 | WARN(1, "name len %u\n", qstr.len); | |
382 | return NULL; | |
383 | } | |
384 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { | |
385 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
386 | return NULL; | |
387 | } | |
1da177e4 | 388 | |
dbcdb504 | 389 | ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL); |
17baa2a2 | 390 | if (!ent) |
391 | goto out; | |
1da177e4 | 392 | |
dbcdb504 AD |
393 | memcpy(ent->name, fn, qstr.len + 1); |
394 | ent->namelen = qstr.len; | |
1da177e4 LT |
395 | ent->mode = mode; |
396 | ent->nlink = nlink; | |
710585d4 | 397 | ent->subdir = RB_ROOT; |
5a622f2d | 398 | atomic_set(&ent->count, 1); |
786d7e16 | 399 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 400 | INIT_LIST_HEAD(&ent->pde_openers); |
17baa2a2 | 401 | out: |
1da177e4 LT |
402 | return ent; |
403 | } | |
404 | ||
405 | struct proc_dir_entry *proc_symlink(const char *name, | |
406 | struct proc_dir_entry *parent, const char *dest) | |
407 | { | |
408 | struct proc_dir_entry *ent; | |
409 | ||
2d3a4e36 | 410 | ent = __proc_create(&parent, name, |
1da177e4 LT |
411 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
412 | ||
413 | if (ent) { | |
414 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
415 | if (ent->data) { | |
416 | strcpy((char*)ent->data,dest); | |
d443b9fd | 417 | ent->proc_iops = &proc_link_inode_operations; |
1da177e4 LT |
418 | if (proc_register(parent, ent) < 0) { |
419 | kfree(ent->data); | |
420 | kfree(ent); | |
421 | ent = NULL; | |
422 | } | |
423 | } else { | |
424 | kfree(ent); | |
425 | ent = NULL; | |
426 | } | |
427 | } | |
428 | return ent; | |
429 | } | |
587d4a17 | 430 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 431 | |
270b5ac2 DH |
432 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
433 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
434 | { |
435 | struct proc_dir_entry *ent; | |
436 | ||
270b5ac2 DH |
437 | if (mode == 0) |
438 | mode = S_IRUGO | S_IXUGO; | |
439 | ||
2d3a4e36 | 440 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 441 | if (ent) { |
270b5ac2 | 442 | ent->data = data; |
d443b9fd AV |
443 | ent->proc_fops = &proc_dir_operations; |
444 | ent->proc_iops = &proc_dir_inode_operations; | |
445 | parent->nlink++; | |
1da177e4 LT |
446 | if (proc_register(parent, ent) < 0) { |
447 | kfree(ent); | |
d443b9fd | 448 | parent->nlink--; |
1da177e4 LT |
449 | ent = NULL; |
450 | } | |
451 | } | |
452 | return ent; | |
453 | } | |
270b5ac2 | 454 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 455 | |
270b5ac2 DH |
456 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
457 | struct proc_dir_entry *parent) | |
78e92b99 | 458 | { |
270b5ac2 | 459 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 460 | } |
270b5ac2 | 461 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 462 | |
1da177e4 LT |
463 | struct proc_dir_entry *proc_mkdir(const char *name, |
464 | struct proc_dir_entry *parent) | |
465 | { | |
270b5ac2 | 466 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 467 | } |
587d4a17 | 468 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 469 | |
d161a13f | 470 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
471 | struct proc_dir_entry *parent, |
472 | const struct file_operations *proc_fops, | |
473 | void *data) | |
2d3a4e36 AD |
474 | { |
475 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
476 | if ((mode & S_IFMT) == 0) |
477 | mode |= S_IFREG; | |
2d3a4e36 | 478 | |
b6cdc731 AV |
479 | if (!S_ISREG(mode)) { |
480 | WARN_ON(1); /* use proc_mkdir() */ | |
481 | return NULL; | |
2d3a4e36 AD |
482 | } |
483 | ||
d443b9fd AV |
484 | BUG_ON(proc_fops == NULL); |
485 | ||
b6cdc731 AV |
486 | if ((mode & S_IALLUGO) == 0) |
487 | mode |= S_IRUGO; | |
488 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
489 | if (!pde) |
490 | goto out; | |
491 | pde->proc_fops = proc_fops; | |
59b74351 | 492 | pde->data = data; |
d443b9fd | 493 | pde->proc_iops = &proc_file_inode_operations; |
2d3a4e36 AD |
494 | if (proc_register(parent, pde) < 0) |
495 | goto out_free; | |
496 | return pde; | |
497 | out_free: | |
498 | kfree(pde); | |
499 | out: | |
500 | return NULL; | |
501 | } | |
587d4a17 | 502 | EXPORT_SYMBOL(proc_create_data); |
271a15ea DH |
503 | |
504 | void proc_set_size(struct proc_dir_entry *de, loff_t size) | |
505 | { | |
506 | de->size = size; | |
507 | } | |
508 | EXPORT_SYMBOL(proc_set_size); | |
509 | ||
510 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
511 | { | |
512 | de->uid = uid; | |
513 | de->gid = gid; | |
514 | } | |
515 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 516 | |
135d5655 | 517 | static void free_proc_entry(struct proc_dir_entry *de) |
1da177e4 | 518 | { |
33d6dce6 | 519 | proc_free_inum(de->low_ino); |
1da177e4 | 520 | |
fd2cbe48 | 521 | if (S_ISLNK(de->mode)) |
1da177e4 LT |
522 | kfree(de->data); |
523 | kfree(de); | |
524 | } | |
525 | ||
135d5655 AD |
526 | void pde_put(struct proc_dir_entry *pde) |
527 | { | |
528 | if (atomic_dec_and_test(&pde->count)) | |
529 | free_proc_entry(pde); | |
530 | } | |
531 | ||
8ce584c7 AV |
532 | /* |
533 | * Remove a /proc entry and free it if it's not currently in use. | |
534 | */ | |
535 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
536 | { | |
8ce584c7 AV |
537 | struct proc_dir_entry *de = NULL; |
538 | const char *fn = name; | |
539 | unsigned int len; | |
540 | ||
541 | spin_lock(&proc_subdir_lock); | |
542 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
543 | spin_unlock(&proc_subdir_lock); | |
544 | return; | |
545 | } | |
546 | len = strlen(fn); | |
547 | ||
710585d4 ND |
548 | de = pde_subdir_find(parent, fn, len); |
549 | if (de) | |
550 | rb_erase(&de->subdir_node, &parent->subdir); | |
8ce584c7 AV |
551 | spin_unlock(&proc_subdir_lock); |
552 | if (!de) { | |
553 | WARN(1, "name '%s'\n", name); | |
554 | return; | |
555 | } | |
556 | ||
866ad9a7 | 557 | proc_entry_rundown(de); |
881adb85 | 558 | |
f649d6d3 AD |
559 | if (S_ISDIR(de->mode)) |
560 | parent->nlink--; | |
561 | de->nlink = 0; | |
710585d4 ND |
562 | WARN(pde_subdir_first(de), |
563 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
564 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 565 | pde_put(de); |
1da177e4 | 566 | } |
587d4a17 | 567 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
568 | |
569 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
570 | { | |
8ce584c7 AV |
571 | struct proc_dir_entry *root = NULL, *de, *next; |
572 | const char *fn = name; | |
573 | unsigned int len; | |
574 | ||
575 | spin_lock(&proc_subdir_lock); | |
576 | if (__xlate_proc_name(name, &parent, &fn) != 0) { | |
577 | spin_unlock(&proc_subdir_lock); | |
578 | return -ENOENT; | |
579 | } | |
580 | len = strlen(fn); | |
581 | ||
710585d4 | 582 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 AV |
583 | if (!root) { |
584 | spin_unlock(&proc_subdir_lock); | |
585 | return -ENOENT; | |
586 | } | |
710585d4 ND |
587 | rb_erase(&root->subdir_node, &parent->subdir); |
588 | ||
8ce584c7 AV |
589 | de = root; |
590 | while (1) { | |
710585d4 | 591 | next = pde_subdir_first(de); |
8ce584c7 | 592 | if (next) { |
710585d4 | 593 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
594 | de = next; |
595 | continue; | |
596 | } | |
597 | spin_unlock(&proc_subdir_lock); | |
598 | ||
866ad9a7 | 599 | proc_entry_rundown(de); |
8ce584c7 AV |
600 | next = de->parent; |
601 | if (S_ISDIR(de->mode)) | |
602 | next->nlink--; | |
603 | de->nlink = 0; | |
604 | if (de == root) | |
605 | break; | |
606 | pde_put(de); | |
607 | ||
608 | spin_lock(&proc_subdir_lock); | |
609 | de = next; | |
610 | } | |
611 | pde_put(root); | |
612 | return 0; | |
613 | } | |
614 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
615 | |
616 | void *proc_get_parent_data(const struct inode *inode) | |
617 | { | |
618 | struct proc_dir_entry *de = PDE(inode); | |
619 | return de->parent->data; | |
620 | } | |
621 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
622 | |
623 | void proc_remove(struct proc_dir_entry *de) | |
624 | { | |
625 | if (de) | |
626 | remove_proc_subtree(de->name, de->parent); | |
627 | } | |
628 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
629 | |
630 | void *PDE_DATA(const struct inode *inode) | |
631 | { | |
632 | return __PDE_DATA(inode); | |
633 | } | |
634 | EXPORT_SYMBOL(PDE_DATA); |