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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> | |
1da177e4 | 22 | #include <linux/bitops.h> |
64a07bd8 | 23 | #include <linux/spinlock.h> |
786d7e16 | 24 | #include <linux/completion.h> |
7c0f6ba6 | 25 | #include <linux/uaccess.h> |
1da177e4 | 26 | |
fee781e6 AB |
27 | #include "internal.h" |
28 | ||
ecf1a3df | 29 | static DEFINE_RWLOCK(proc_subdir_lock); |
64a07bd8 | 30 | |
312ec7e5 | 31 | static int proc_match(unsigned int len, const char *name, struct proc_dir_entry *de) |
1da177e4 | 32 | { |
710585d4 ND |
33 | if (len < de->namelen) |
34 | return -1; | |
35 | if (len > de->namelen) | |
36 | return 1; | |
37 | ||
38 | return memcmp(name, de->name, len); | |
39 | } | |
40 | ||
41 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) | |
42 | { | |
2fc1e948 ND |
43 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
44 | subdir_node); | |
710585d4 ND |
45 | } |
46 | ||
47 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) | |
48 | { | |
2fc1e948 ND |
49 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
50 | subdir_node); | |
710585d4 ND |
51 | } |
52 | ||
53 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, | |
54 | const char *name, | |
55 | unsigned int len) | |
56 | { | |
57 | struct rb_node *node = dir->subdir.rb_node; | |
58 | ||
59 | while (node) { | |
60 | struct proc_dir_entry *de = container_of(node, | |
61 | struct proc_dir_entry, | |
62 | subdir_node); | |
63 | int result = proc_match(len, name, de); | |
64 | ||
65 | if (result < 0) | |
66 | node = node->rb_left; | |
67 | else if (result > 0) | |
68 | node = node->rb_right; | |
69 | else | |
70 | return de; | |
71 | } | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | static bool pde_subdir_insert(struct proc_dir_entry *dir, | |
76 | struct proc_dir_entry *de) | |
77 | { | |
78 | struct rb_root *root = &dir->subdir; | |
79 | struct rb_node **new = &root->rb_node, *parent = NULL; | |
80 | ||
81 | /* Figure out where to put new node */ | |
82 | while (*new) { | |
83 | struct proc_dir_entry *this = | |
84 | container_of(*new, struct proc_dir_entry, subdir_node); | |
85 | int result = proc_match(de->namelen, de->name, this); | |
86 | ||
87 | parent = *new; | |
88 | if (result < 0) | |
89 | new = &(*new)->rb_left; | |
90 | else if (result > 0) | |
91 | new = &(*new)->rb_right; | |
92 | else | |
93 | return false; | |
94 | } | |
95 | ||
96 | /* Add new node and rebalance tree. */ | |
97 | rb_link_node(&de->subdir_node, parent, new); | |
98 | rb_insert_color(&de->subdir_node, root); | |
99 | return true; | |
1da177e4 LT |
100 | } |
101 | ||
1da177e4 LT |
102 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
103 | { | |
2b0143b5 | 104 | struct inode *inode = d_inode(dentry); |
1da177e4 | 105 | struct proc_dir_entry *de = PDE(inode); |
a6071d80 | 106 | struct user_namespace *s_user_ns; |
1da177e4 LT |
107 | int error; |
108 | ||
a6071d80 EB |
109 | /* Don't let anyone mess with weird proc files */ |
110 | s_user_ns = inode->i_sb->s_user_ns; | |
111 | if (!kuid_has_mapping(s_user_ns, inode->i_uid) || | |
112 | !kgid_has_mapping(s_user_ns, inode->i_gid)) | |
113 | return -EPERM; | |
114 | ||
31051c85 | 115 | error = setattr_prepare(dentry, iattr); |
1da177e4 | 116 | if (error) |
1025774c | 117 | return error; |
1da177e4 | 118 | |
1025774c CH |
119 | setattr_copy(inode, iattr); |
120 | mark_inode_dirty(inode); | |
46f69557 | 121 | |
cdf7e8dd | 122 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 123 | de->mode = inode->i_mode; |
1025774c | 124 | return 0; |
1da177e4 LT |
125 | } |
126 | ||
2b579bee MS |
127 | static int proc_getattr(struct vfsmount *mnt, struct dentry *dentry, |
128 | struct kstat *stat) | |
129 | { | |
2b0143b5 | 130 | struct inode *inode = d_inode(dentry); |
6bee55f9 | 131 | struct proc_dir_entry *de = PDE(inode); |
2b579bee | 132 | if (de && de->nlink) |
bfe86848 | 133 | set_nlink(inode, de->nlink); |
2b579bee MS |
134 | |
135 | generic_fillattr(inode, stat); | |
136 | return 0; | |
137 | } | |
138 | ||
c5ef1c42 | 139 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
140 | .setattr = proc_notify_change, |
141 | }; | |
142 | ||
143 | /* | |
144 | * This function parses a name such as "tty/driver/serial", and | |
145 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
146 | * returns "serial" in residual. | |
147 | */ | |
e17a5765 AD |
148 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
149 | const char **residual) | |
1da177e4 LT |
150 | { |
151 | const char *cp = name, *next; | |
152 | struct proc_dir_entry *de; | |
312ec7e5 | 153 | unsigned int len; |
1da177e4 | 154 | |
7cee4e00 AD |
155 | de = *ret; |
156 | if (!de) | |
157 | de = &proc_root; | |
158 | ||
1da177e4 LT |
159 | while (1) { |
160 | next = strchr(cp, '/'); | |
161 | if (!next) | |
162 | break; | |
163 | ||
164 | len = next - cp; | |
710585d4 | 165 | de = pde_subdir_find(de, cp, len); |
12bac0d9 AD |
166 | if (!de) { |
167 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 168 | return -ENOENT; |
12bac0d9 | 169 | } |
1da177e4 LT |
170 | cp += len + 1; |
171 | } | |
172 | *residual = cp; | |
173 | *ret = de; | |
e17a5765 AD |
174 | return 0; |
175 | } | |
176 | ||
177 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
178 | const char **residual) | |
179 | { | |
180 | int rv; | |
181 | ||
ecf1a3df | 182 | read_lock(&proc_subdir_lock); |
e17a5765 | 183 | rv = __xlate_proc_name(name, ret, residual); |
ecf1a3df | 184 | read_unlock(&proc_subdir_lock); |
e17a5765 | 185 | return rv; |
1da177e4 LT |
186 | } |
187 | ||
9a185409 | 188 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 LT |
189 | static DEFINE_SPINLOCK(proc_inum_lock); /* protects the above */ |
190 | ||
67935df4 | 191 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
192 | |
193 | /* | |
194 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
195 | * 0xffffffff, or zero on failure. | |
196 | */ | |
33d6dce6 | 197 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 198 | { |
67935df4 | 199 | unsigned int i; |
1da177e4 LT |
200 | int error; |
201 | ||
202 | retry: | |
33d6dce6 EB |
203 | if (!ida_pre_get(&proc_inum_ida, GFP_KERNEL)) |
204 | return -ENOMEM; | |
1da177e4 | 205 | |
dfb2ea45 | 206 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 207 | error = ida_get_new(&proc_inum_ida, &i); |
dfb2ea45 | 208 | spin_unlock_irq(&proc_inum_lock); |
1da177e4 LT |
209 | if (error == -EAGAIN) |
210 | goto retry; | |
211 | else if (error) | |
33d6dce6 | 212 | return error; |
1da177e4 | 213 | |
67935df4 | 214 | if (i > UINT_MAX - PROC_DYNAMIC_FIRST) { |
dfb2ea45 | 215 | spin_lock_irq(&proc_inum_lock); |
9a185409 | 216 | ida_remove(&proc_inum_ida, i); |
dfb2ea45 | 217 | spin_unlock_irq(&proc_inum_lock); |
33d6dce6 | 218 | return -ENOSPC; |
67935df4 | 219 | } |
33d6dce6 EB |
220 | *inum = PROC_DYNAMIC_FIRST + i; |
221 | return 0; | |
1da177e4 LT |
222 | } |
223 | ||
33d6dce6 | 224 | void proc_free_inum(unsigned int inum) |
1da177e4 | 225 | { |
dfb2ea45 EB |
226 | unsigned long flags; |
227 | spin_lock_irqsave(&proc_inum_lock, flags); | |
9a185409 | 228 | ida_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
dfb2ea45 | 229 | spin_unlock_irqrestore(&proc_inum_lock, flags); |
1da177e4 LT |
230 | } |
231 | ||
1da177e4 LT |
232 | /* |
233 | * Don't create negative dentries here, return -ENOENT by hand | |
234 | * instead. | |
235 | */ | |
e9720acd PE |
236 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
237 | struct dentry *dentry) | |
1da177e4 | 238 | { |
d3d009cb | 239 | struct inode *inode; |
1da177e4 | 240 | |
ecf1a3df | 241 | read_lock(&proc_subdir_lock); |
710585d4 ND |
242 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
243 | if (de) { | |
244 | pde_get(de); | |
ecf1a3df | 245 | read_unlock(&proc_subdir_lock); |
710585d4 ND |
246 | inode = proc_get_inode(dir->i_sb, de); |
247 | if (!inode) | |
248 | return ERR_PTR(-ENOMEM); | |
249 | d_set_d_op(dentry, &simple_dentry_operations); | |
250 | d_add(dentry, inode); | |
251 | return NULL; | |
1da177e4 | 252 | } |
ecf1a3df | 253 | read_unlock(&proc_subdir_lock); |
d3d009cb | 254 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
255 | } |
256 | ||
e9720acd | 257 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 258 | unsigned int flags) |
e9720acd PE |
259 | { |
260 | return proc_lookup_de(PDE(dir), dir, dentry); | |
261 | } | |
262 | ||
1da177e4 LT |
263 | /* |
264 | * This returns non-zero if at EOF, so that the /proc | |
265 | * root directory can use this and check if it should | |
266 | * continue with the <pid> entries.. | |
267 | * | |
268 | * Note that the VFS-layer doesn't care about the return | |
269 | * value of the readdir() call, as long as it's non-negative | |
270 | * for success.. | |
271 | */ | |
f0c3b509 AV |
272 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
273 | struct dir_context *ctx) | |
1da177e4 | 274 | { |
1da177e4 | 275 | int i; |
f0c3b509 AV |
276 | |
277 | if (!dir_emit_dots(file, ctx)) | |
278 | return 0; | |
279 | ||
ecf1a3df | 280 | read_lock(&proc_subdir_lock); |
710585d4 | 281 | de = pde_subdir_first(de); |
f0c3b509 AV |
282 | i = ctx->pos - 2; |
283 | for (;;) { | |
284 | if (!de) { | |
ecf1a3df | 285 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
286 | return 0; |
287 | } | |
288 | if (!i) | |
289 | break; | |
710585d4 | 290 | de = pde_subdir_next(de); |
f0c3b509 | 291 | i--; |
1da177e4 | 292 | } |
f0c3b509 AV |
293 | |
294 | do { | |
295 | struct proc_dir_entry *next; | |
296 | pde_get(de); | |
ecf1a3df | 297 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
298 | if (!dir_emit(ctx, de->name, de->namelen, |
299 | de->low_ino, de->mode >> 12)) { | |
300 | pde_put(de); | |
301 | return 0; | |
302 | } | |
ecf1a3df | 303 | read_lock(&proc_subdir_lock); |
f0c3b509 | 304 | ctx->pos++; |
710585d4 | 305 | next = pde_subdir_next(de); |
f0c3b509 AV |
306 | pde_put(de); |
307 | de = next; | |
308 | } while (de); | |
ecf1a3df | 309 | read_unlock(&proc_subdir_lock); |
fd3930f7 | 310 | return 1; |
1da177e4 LT |
311 | } |
312 | ||
f0c3b509 | 313 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 314 | { |
f0c3b509 | 315 | struct inode *inode = file_inode(file); |
e9720acd | 316 | |
f0c3b509 | 317 | return proc_readdir_de(PDE(inode), file, ctx); |
e9720acd PE |
318 | } |
319 | ||
1da177e4 LT |
320 | /* |
321 | * These are the generic /proc directory operations. They | |
322 | * use the in-memory "struct proc_dir_entry" tree to parse | |
323 | * the /proc directory. | |
324 | */ | |
00977a59 | 325 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 326 | .llseek = generic_file_llseek, |
1da177e4 | 327 | .read = generic_read_dir, |
f50752ea | 328 | .iterate_shared = proc_readdir, |
1da177e4 LT |
329 | }; |
330 | ||
331 | /* | |
332 | * proc directories can do almost nothing.. | |
333 | */ | |
c5ef1c42 | 334 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 335 | .lookup = proc_lookup, |
2b579bee | 336 | .getattr = proc_getattr, |
1da177e4 LT |
337 | .setattr = proc_notify_change, |
338 | }; | |
339 | ||
340 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
341 | { | |
33d6dce6 | 342 | int ret; |
710585d4 | 343 | |
33d6dce6 EB |
344 | ret = proc_alloc_inum(&dp->low_ino); |
345 | if (ret) | |
346 | return ret; | |
64a07bd8 | 347 | |
ecf1a3df | 348 | write_lock(&proc_subdir_lock); |
99fc06df | 349 | dp->parent = dir; |
b208d54b | 350 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
351 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
352 | dir->name, dp->name); | |
ecf1a3df | 353 | write_unlock(&proc_subdir_lock); |
b208d54b DB |
354 | proc_free_inum(dp->low_ino); |
355 | return -EEXIST; | |
356 | } | |
ecf1a3df | 357 | write_unlock(&proc_subdir_lock); |
99fc06df | 358 | |
1da177e4 LT |
359 | return 0; |
360 | } | |
361 | ||
2d3a4e36 | 362 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 363 | const char *name, |
d161a13f | 364 | umode_t mode, |
1da177e4 LT |
365 | nlink_t nlink) |
366 | { | |
367 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
368 | const char *fn; |
369 | struct qstr qstr; | |
1da177e4 | 370 | |
7cee4e00 | 371 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 372 | goto out; |
dbcdb504 AD |
373 | qstr.name = fn; |
374 | qstr.len = strlen(fn); | |
375 | if (qstr.len == 0 || qstr.len >= 256) { | |
376 | WARN(1, "name len %u\n", qstr.len); | |
377 | return NULL; | |
378 | } | |
379 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { | |
380 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
381 | return NULL; | |
382 | } | |
eb6d38d5 EB |
383 | if (is_empty_pde(*parent)) { |
384 | WARN(1, "attempt to add to permanently empty directory"); | |
385 | return NULL; | |
386 | } | |
1da177e4 | 387 | |
dbcdb504 | 388 | ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL); |
17baa2a2 | 389 | if (!ent) |
390 | goto out; | |
1da177e4 | 391 | |
dbcdb504 AD |
392 | memcpy(ent->name, fn, qstr.len + 1); |
393 | ent->namelen = qstr.len; | |
1da177e4 LT |
394 | ent->mode = mode; |
395 | ent->nlink = nlink; | |
710585d4 | 396 | ent->subdir = RB_ROOT; |
5a622f2d | 397 | atomic_set(&ent->count, 1); |
786d7e16 | 398 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 399 | INIT_LIST_HEAD(&ent->pde_openers); |
c110486f DT |
400 | proc_set_user(ent, (*parent)->uid, (*parent)->gid); |
401 | ||
17baa2a2 | 402 | out: |
1da177e4 LT |
403 | return ent; |
404 | } | |
405 | ||
406 | struct proc_dir_entry *proc_symlink(const char *name, | |
407 | struct proc_dir_entry *parent, const char *dest) | |
408 | { | |
409 | struct proc_dir_entry *ent; | |
410 | ||
2d3a4e36 | 411 | ent = __proc_create(&parent, name, |
1da177e4 LT |
412 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
413 | ||
414 | if (ent) { | |
415 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
416 | if (ent->data) { | |
417 | strcpy((char*)ent->data,dest); | |
d443b9fd | 418 | ent->proc_iops = &proc_link_inode_operations; |
1da177e4 LT |
419 | if (proc_register(parent, ent) < 0) { |
420 | kfree(ent->data); | |
421 | kfree(ent); | |
422 | ent = NULL; | |
423 | } | |
424 | } else { | |
425 | kfree(ent); | |
426 | ent = NULL; | |
427 | } | |
428 | } | |
429 | return ent; | |
430 | } | |
587d4a17 | 431 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 432 | |
270b5ac2 DH |
433 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
434 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
435 | { |
436 | struct proc_dir_entry *ent; | |
437 | ||
270b5ac2 DH |
438 | if (mode == 0) |
439 | mode = S_IRUGO | S_IXUGO; | |
440 | ||
2d3a4e36 | 441 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 442 | if (ent) { |
270b5ac2 | 443 | ent->data = data; |
d443b9fd AV |
444 | ent->proc_fops = &proc_dir_operations; |
445 | ent->proc_iops = &proc_dir_inode_operations; | |
446 | parent->nlink++; | |
1da177e4 LT |
447 | if (proc_register(parent, ent) < 0) { |
448 | kfree(ent); | |
d443b9fd | 449 | parent->nlink--; |
1da177e4 LT |
450 | ent = NULL; |
451 | } | |
452 | } | |
453 | return ent; | |
454 | } | |
270b5ac2 | 455 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 456 | |
270b5ac2 DH |
457 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
458 | struct proc_dir_entry *parent) | |
78e92b99 | 459 | { |
270b5ac2 | 460 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 461 | } |
270b5ac2 | 462 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 463 | |
1da177e4 LT |
464 | struct proc_dir_entry *proc_mkdir(const char *name, |
465 | struct proc_dir_entry *parent) | |
466 | { | |
270b5ac2 | 467 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 468 | } |
587d4a17 | 469 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 470 | |
eb6d38d5 EB |
471 | struct proc_dir_entry *proc_create_mount_point(const char *name) |
472 | { | |
473 | umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
474 | struct proc_dir_entry *ent, *parent = NULL; | |
475 | ||
476 | ent = __proc_create(&parent, name, mode, 2); | |
477 | if (ent) { | |
478 | ent->data = NULL; | |
479 | ent->proc_fops = NULL; | |
480 | ent->proc_iops = NULL; | |
481 | if (proc_register(parent, ent) < 0) { | |
482 | kfree(ent); | |
483 | parent->nlink--; | |
484 | ent = NULL; | |
485 | } | |
486 | } | |
487 | return ent; | |
488 | } | |
f97df70b | 489 | EXPORT_SYMBOL(proc_create_mount_point); |
eb6d38d5 | 490 | |
d161a13f | 491 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
492 | struct proc_dir_entry *parent, |
493 | const struct file_operations *proc_fops, | |
494 | void *data) | |
2d3a4e36 AD |
495 | { |
496 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
497 | if ((mode & S_IFMT) == 0) |
498 | mode |= S_IFREG; | |
2d3a4e36 | 499 | |
b6cdc731 AV |
500 | if (!S_ISREG(mode)) { |
501 | WARN_ON(1); /* use proc_mkdir() */ | |
502 | return NULL; | |
2d3a4e36 AD |
503 | } |
504 | ||
d443b9fd AV |
505 | BUG_ON(proc_fops == NULL); |
506 | ||
b6cdc731 AV |
507 | if ((mode & S_IALLUGO) == 0) |
508 | mode |= S_IRUGO; | |
509 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
510 | if (!pde) |
511 | goto out; | |
512 | pde->proc_fops = proc_fops; | |
59b74351 | 513 | pde->data = data; |
d443b9fd | 514 | pde->proc_iops = &proc_file_inode_operations; |
2d3a4e36 AD |
515 | if (proc_register(parent, pde) < 0) |
516 | goto out_free; | |
517 | return pde; | |
518 | out_free: | |
519 | kfree(pde); | |
520 | out: | |
521 | return NULL; | |
522 | } | |
587d4a17 | 523 | EXPORT_SYMBOL(proc_create_data); |
271a15ea DH |
524 | |
525 | void proc_set_size(struct proc_dir_entry *de, loff_t size) | |
526 | { | |
527 | de->size = size; | |
528 | } | |
529 | EXPORT_SYMBOL(proc_set_size); | |
530 | ||
531 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
532 | { | |
533 | de->uid = uid; | |
534 | de->gid = gid; | |
535 | } | |
536 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 537 | |
135d5655 | 538 | static void free_proc_entry(struct proc_dir_entry *de) |
1da177e4 | 539 | { |
33d6dce6 | 540 | proc_free_inum(de->low_ino); |
1da177e4 | 541 | |
fd2cbe48 | 542 | if (S_ISLNK(de->mode)) |
1da177e4 LT |
543 | kfree(de->data); |
544 | kfree(de); | |
545 | } | |
546 | ||
135d5655 AD |
547 | void pde_put(struct proc_dir_entry *pde) |
548 | { | |
549 | if (atomic_dec_and_test(&pde->count)) | |
550 | free_proc_entry(pde); | |
551 | } | |
552 | ||
8ce584c7 AV |
553 | /* |
554 | * Remove a /proc entry and free it if it's not currently in use. | |
555 | */ | |
556 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
557 | { | |
8ce584c7 AV |
558 | struct proc_dir_entry *de = NULL; |
559 | const char *fn = name; | |
560 | unsigned int len; | |
561 | ||
ecf1a3df | 562 | write_lock(&proc_subdir_lock); |
8ce584c7 | 563 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 564 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
565 | return; |
566 | } | |
567 | len = strlen(fn); | |
568 | ||
710585d4 ND |
569 | de = pde_subdir_find(parent, fn, len); |
570 | if (de) | |
571 | rb_erase(&de->subdir_node, &parent->subdir); | |
ecf1a3df | 572 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
573 | if (!de) { |
574 | WARN(1, "name '%s'\n", name); | |
575 | return; | |
576 | } | |
577 | ||
866ad9a7 | 578 | proc_entry_rundown(de); |
881adb85 | 579 | |
f649d6d3 AD |
580 | if (S_ISDIR(de->mode)) |
581 | parent->nlink--; | |
582 | de->nlink = 0; | |
710585d4 ND |
583 | WARN(pde_subdir_first(de), |
584 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
585 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 586 | pde_put(de); |
1da177e4 | 587 | } |
587d4a17 | 588 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
589 | |
590 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
591 | { | |
8ce584c7 AV |
592 | struct proc_dir_entry *root = NULL, *de, *next; |
593 | const char *fn = name; | |
594 | unsigned int len; | |
595 | ||
ecf1a3df | 596 | write_lock(&proc_subdir_lock); |
8ce584c7 | 597 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 598 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
599 | return -ENOENT; |
600 | } | |
601 | len = strlen(fn); | |
602 | ||
710585d4 | 603 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 | 604 | if (!root) { |
ecf1a3df | 605 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
606 | return -ENOENT; |
607 | } | |
710585d4 ND |
608 | rb_erase(&root->subdir_node, &parent->subdir); |
609 | ||
8ce584c7 AV |
610 | de = root; |
611 | while (1) { | |
710585d4 | 612 | next = pde_subdir_first(de); |
8ce584c7 | 613 | if (next) { |
710585d4 | 614 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
615 | de = next; |
616 | continue; | |
617 | } | |
ecf1a3df | 618 | write_unlock(&proc_subdir_lock); |
8ce584c7 | 619 | |
866ad9a7 | 620 | proc_entry_rundown(de); |
8ce584c7 AV |
621 | next = de->parent; |
622 | if (S_ISDIR(de->mode)) | |
623 | next->nlink--; | |
624 | de->nlink = 0; | |
625 | if (de == root) | |
626 | break; | |
627 | pde_put(de); | |
628 | ||
ecf1a3df | 629 | write_lock(&proc_subdir_lock); |
8ce584c7 AV |
630 | de = next; |
631 | } | |
632 | pde_put(root); | |
633 | return 0; | |
634 | } | |
635 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
636 | |
637 | void *proc_get_parent_data(const struct inode *inode) | |
638 | { | |
639 | struct proc_dir_entry *de = PDE(inode); | |
640 | return de->parent->data; | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
643 | |
644 | void proc_remove(struct proc_dir_entry *de) | |
645 | { | |
646 | if (de) | |
647 | remove_proc_subtree(de->name, de->parent); | |
648 | } | |
649 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
650 | |
651 | void *PDE_DATA(const struct inode *inode) | |
652 | { | |
653 | return __PDE_DATA(inode); | |
654 | } | |
655 | EXPORT_SYMBOL(PDE_DATA); |