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) { | |
4e4a7fb7 GT |
60 | struct proc_dir_entry *de = rb_entry(node, |
61 | struct proc_dir_entry, | |
62 | subdir_node); | |
710585d4 ND |
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) { | |
4e4a7fb7 GT |
83 | struct proc_dir_entry *this = rb_entry(*new, |
84 | struct proc_dir_entry, | |
85 | subdir_node); | |
710585d4 ND |
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 | { | |
2b0143b5 | 105 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
106 | struct proc_dir_entry *de = PDE(inode); |
107 | int error; | |
108 | ||
31051c85 | 109 | error = setattr_prepare(dentry, iattr); |
1da177e4 | 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 | ||
a528d35e DH |
121 | static int proc_getattr(const struct path *path, struct kstat *stat, |
122 | u32 request_mask, unsigned int query_flags) | |
2b579bee | 123 | { |
a528d35e | 124 | struct inode *inode = d_inode(path->dentry); |
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 | ||
ecf1a3df | 176 | read_lock(&proc_subdir_lock); |
e17a5765 | 177 | rv = __xlate_proc_name(name, ret, residual); |
ecf1a3df | 178 | read_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 | ||
1da177e4 LT |
226 | /* |
227 | * Don't create negative dentries here, return -ENOENT by hand | |
228 | * instead. | |
229 | */ | |
e9720acd PE |
230 | struct dentry *proc_lookup_de(struct proc_dir_entry *de, struct inode *dir, |
231 | struct dentry *dentry) | |
1da177e4 | 232 | { |
d3d009cb | 233 | struct inode *inode; |
1da177e4 | 234 | |
ecf1a3df | 235 | read_lock(&proc_subdir_lock); |
710585d4 ND |
236 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
237 | if (de) { | |
238 | pde_get(de); | |
ecf1a3df | 239 | read_unlock(&proc_subdir_lock); |
710585d4 ND |
240 | inode = proc_get_inode(dir->i_sb, de); |
241 | if (!inode) | |
242 | return ERR_PTR(-ENOMEM); | |
243 | d_set_d_op(dentry, &simple_dentry_operations); | |
244 | d_add(dentry, inode); | |
245 | return NULL; | |
1da177e4 | 246 | } |
ecf1a3df | 247 | read_unlock(&proc_subdir_lock); |
d3d009cb | 248 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
249 | } |
250 | ||
e9720acd | 251 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 252 | unsigned int flags) |
e9720acd PE |
253 | { |
254 | return proc_lookup_de(PDE(dir), dir, dentry); | |
255 | } | |
256 | ||
1da177e4 LT |
257 | /* |
258 | * This returns non-zero if at EOF, so that the /proc | |
259 | * root directory can use this and check if it should | |
260 | * continue with the <pid> entries.. | |
261 | * | |
262 | * Note that the VFS-layer doesn't care about the return | |
263 | * value of the readdir() call, as long as it's non-negative | |
264 | * for success.. | |
265 | */ | |
f0c3b509 AV |
266 | int proc_readdir_de(struct proc_dir_entry *de, struct file *file, |
267 | struct dir_context *ctx) | |
1da177e4 | 268 | { |
1da177e4 | 269 | int i; |
f0c3b509 AV |
270 | |
271 | if (!dir_emit_dots(file, ctx)) | |
272 | return 0; | |
273 | ||
ecf1a3df | 274 | read_lock(&proc_subdir_lock); |
710585d4 | 275 | de = pde_subdir_first(de); |
f0c3b509 AV |
276 | i = ctx->pos - 2; |
277 | for (;;) { | |
278 | if (!de) { | |
ecf1a3df | 279 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
280 | return 0; |
281 | } | |
282 | if (!i) | |
283 | break; | |
710585d4 | 284 | de = pde_subdir_next(de); |
f0c3b509 | 285 | i--; |
1da177e4 | 286 | } |
f0c3b509 AV |
287 | |
288 | do { | |
289 | struct proc_dir_entry *next; | |
290 | pde_get(de); | |
ecf1a3df | 291 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
292 | if (!dir_emit(ctx, de->name, de->namelen, |
293 | de->low_ino, de->mode >> 12)) { | |
294 | pde_put(de); | |
295 | return 0; | |
296 | } | |
ecf1a3df | 297 | read_lock(&proc_subdir_lock); |
f0c3b509 | 298 | ctx->pos++; |
710585d4 | 299 | next = pde_subdir_next(de); |
f0c3b509 AV |
300 | pde_put(de); |
301 | de = next; | |
302 | } while (de); | |
ecf1a3df | 303 | read_unlock(&proc_subdir_lock); |
fd3930f7 | 304 | return 1; |
1da177e4 LT |
305 | } |
306 | ||
f0c3b509 | 307 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 308 | { |
f0c3b509 | 309 | struct inode *inode = file_inode(file); |
e9720acd | 310 | |
f0c3b509 | 311 | return proc_readdir_de(PDE(inode), file, ctx); |
e9720acd PE |
312 | } |
313 | ||
1da177e4 LT |
314 | /* |
315 | * These are the generic /proc directory operations. They | |
316 | * use the in-memory "struct proc_dir_entry" tree to parse | |
317 | * the /proc directory. | |
318 | */ | |
00977a59 | 319 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 320 | .llseek = generic_file_llseek, |
1da177e4 | 321 | .read = generic_read_dir, |
f50752ea | 322 | .iterate_shared = proc_readdir, |
1da177e4 LT |
323 | }; |
324 | ||
325 | /* | |
326 | * proc directories can do almost nothing.. | |
327 | */ | |
c5ef1c42 | 328 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 329 | .lookup = proc_lookup, |
2b579bee | 330 | .getattr = proc_getattr, |
1da177e4 LT |
331 | .setattr = proc_notify_change, |
332 | }; | |
333 | ||
334 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
335 | { | |
33d6dce6 | 336 | int ret; |
710585d4 | 337 | |
33d6dce6 EB |
338 | ret = proc_alloc_inum(&dp->low_ino); |
339 | if (ret) | |
340 | return ret; | |
64a07bd8 | 341 | |
ecf1a3df | 342 | write_lock(&proc_subdir_lock); |
99fc06df | 343 | dp->parent = dir; |
b208d54b | 344 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
345 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
346 | dir->name, dp->name); | |
ecf1a3df | 347 | write_unlock(&proc_subdir_lock); |
b208d54b DB |
348 | proc_free_inum(dp->low_ino); |
349 | return -EEXIST; | |
350 | } | |
ecf1a3df | 351 | write_unlock(&proc_subdir_lock); |
99fc06df | 352 | |
1da177e4 LT |
353 | return 0; |
354 | } | |
355 | ||
2d3a4e36 | 356 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 357 | const char *name, |
d161a13f | 358 | umode_t mode, |
1da177e4 LT |
359 | nlink_t nlink) |
360 | { | |
361 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
362 | const char *fn; |
363 | struct qstr qstr; | |
1da177e4 | 364 | |
7cee4e00 | 365 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 366 | goto out; |
dbcdb504 AD |
367 | qstr.name = fn; |
368 | qstr.len = strlen(fn); | |
369 | if (qstr.len == 0 || qstr.len >= 256) { | |
370 | WARN(1, "name len %u\n", qstr.len); | |
371 | return NULL; | |
372 | } | |
373 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { | |
374 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
375 | return NULL; | |
376 | } | |
eb6d38d5 EB |
377 | if (is_empty_pde(*parent)) { |
378 | WARN(1, "attempt to add to permanently empty directory"); | |
379 | return NULL; | |
380 | } | |
1da177e4 | 381 | |
dbcdb504 | 382 | ent = kzalloc(sizeof(struct proc_dir_entry) + qstr.len + 1, GFP_KERNEL); |
17baa2a2 | 383 | if (!ent) |
384 | goto out; | |
1da177e4 | 385 | |
dbcdb504 AD |
386 | memcpy(ent->name, fn, qstr.len + 1); |
387 | ent->namelen = qstr.len; | |
1da177e4 LT |
388 | ent->mode = mode; |
389 | ent->nlink = nlink; | |
710585d4 | 390 | ent->subdir = RB_ROOT; |
5a622f2d | 391 | atomic_set(&ent->count, 1); |
786d7e16 | 392 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 393 | INIT_LIST_HEAD(&ent->pde_openers); |
c110486f DT |
394 | proc_set_user(ent, (*parent)->uid, (*parent)->gid); |
395 | ||
17baa2a2 | 396 | out: |
1da177e4 LT |
397 | return ent; |
398 | } | |
399 | ||
400 | struct proc_dir_entry *proc_symlink(const char *name, | |
401 | struct proc_dir_entry *parent, const char *dest) | |
402 | { | |
403 | struct proc_dir_entry *ent; | |
404 | ||
2d3a4e36 | 405 | ent = __proc_create(&parent, name, |
1da177e4 LT |
406 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
407 | ||
408 | if (ent) { | |
409 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
410 | if (ent->data) { | |
411 | strcpy((char*)ent->data,dest); | |
d443b9fd | 412 | ent->proc_iops = &proc_link_inode_operations; |
1da177e4 LT |
413 | if (proc_register(parent, ent) < 0) { |
414 | kfree(ent->data); | |
415 | kfree(ent); | |
416 | ent = NULL; | |
417 | } | |
418 | } else { | |
419 | kfree(ent); | |
420 | ent = NULL; | |
421 | } | |
422 | } | |
423 | return ent; | |
424 | } | |
587d4a17 | 425 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 426 | |
270b5ac2 DH |
427 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
428 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
429 | { |
430 | struct proc_dir_entry *ent; | |
431 | ||
270b5ac2 DH |
432 | if (mode == 0) |
433 | mode = S_IRUGO | S_IXUGO; | |
434 | ||
2d3a4e36 | 435 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 436 | if (ent) { |
270b5ac2 | 437 | ent->data = data; |
d443b9fd AV |
438 | ent->proc_fops = &proc_dir_operations; |
439 | ent->proc_iops = &proc_dir_inode_operations; | |
440 | parent->nlink++; | |
1da177e4 LT |
441 | if (proc_register(parent, ent) < 0) { |
442 | kfree(ent); | |
d443b9fd | 443 | parent->nlink--; |
1da177e4 LT |
444 | ent = NULL; |
445 | } | |
446 | } | |
447 | return ent; | |
448 | } | |
270b5ac2 | 449 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 450 | |
270b5ac2 DH |
451 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
452 | struct proc_dir_entry *parent) | |
78e92b99 | 453 | { |
270b5ac2 | 454 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 455 | } |
270b5ac2 | 456 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 457 | |
1da177e4 LT |
458 | struct proc_dir_entry *proc_mkdir(const char *name, |
459 | struct proc_dir_entry *parent) | |
460 | { | |
270b5ac2 | 461 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 462 | } |
587d4a17 | 463 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 464 | |
eb6d38d5 EB |
465 | struct proc_dir_entry *proc_create_mount_point(const char *name) |
466 | { | |
467 | umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
468 | struct proc_dir_entry *ent, *parent = NULL; | |
469 | ||
470 | ent = __proc_create(&parent, name, mode, 2); | |
471 | if (ent) { | |
472 | ent->data = NULL; | |
473 | ent->proc_fops = NULL; | |
474 | ent->proc_iops = NULL; | |
d66bb160 | 475 | parent->nlink++; |
eb6d38d5 EB |
476 | if (proc_register(parent, ent) < 0) { |
477 | kfree(ent); | |
478 | parent->nlink--; | |
479 | ent = NULL; | |
480 | } | |
481 | } | |
482 | return ent; | |
483 | } | |
f97df70b | 484 | EXPORT_SYMBOL(proc_create_mount_point); |
eb6d38d5 | 485 | |
d161a13f | 486 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
487 | struct proc_dir_entry *parent, |
488 | const struct file_operations *proc_fops, | |
489 | void *data) | |
2d3a4e36 AD |
490 | { |
491 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
492 | if ((mode & S_IFMT) == 0) |
493 | mode |= S_IFREG; | |
2d3a4e36 | 494 | |
b6cdc731 AV |
495 | if (!S_ISREG(mode)) { |
496 | WARN_ON(1); /* use proc_mkdir() */ | |
497 | return NULL; | |
2d3a4e36 AD |
498 | } |
499 | ||
d443b9fd AV |
500 | BUG_ON(proc_fops == NULL); |
501 | ||
b6cdc731 AV |
502 | if ((mode & S_IALLUGO) == 0) |
503 | mode |= S_IRUGO; | |
504 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
505 | if (!pde) |
506 | goto out; | |
507 | pde->proc_fops = proc_fops; | |
59b74351 | 508 | pde->data = data; |
d443b9fd | 509 | pde->proc_iops = &proc_file_inode_operations; |
2d3a4e36 AD |
510 | if (proc_register(parent, pde) < 0) |
511 | goto out_free; | |
512 | return pde; | |
513 | out_free: | |
514 | kfree(pde); | |
515 | out: | |
516 | return NULL; | |
517 | } | |
587d4a17 | 518 | EXPORT_SYMBOL(proc_create_data); |
271a15ea DH |
519 | |
520 | void proc_set_size(struct proc_dir_entry *de, loff_t size) | |
521 | { | |
522 | de->size = size; | |
523 | } | |
524 | EXPORT_SYMBOL(proc_set_size); | |
525 | ||
526 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
527 | { | |
528 | de->uid = uid; | |
529 | de->gid = gid; | |
530 | } | |
531 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 532 | |
135d5655 | 533 | static void free_proc_entry(struct proc_dir_entry *de) |
1da177e4 | 534 | { |
33d6dce6 | 535 | proc_free_inum(de->low_ino); |
1da177e4 | 536 | |
fd2cbe48 | 537 | if (S_ISLNK(de->mode)) |
1da177e4 LT |
538 | kfree(de->data); |
539 | kfree(de); | |
540 | } | |
541 | ||
135d5655 AD |
542 | void pde_put(struct proc_dir_entry *pde) |
543 | { | |
544 | if (atomic_dec_and_test(&pde->count)) | |
545 | free_proc_entry(pde); | |
546 | } | |
547 | ||
8ce584c7 AV |
548 | /* |
549 | * Remove a /proc entry and free it if it's not currently in use. | |
550 | */ | |
551 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
552 | { | |
8ce584c7 AV |
553 | struct proc_dir_entry *de = NULL; |
554 | const char *fn = name; | |
555 | unsigned int len; | |
556 | ||
ecf1a3df | 557 | write_lock(&proc_subdir_lock); |
8ce584c7 | 558 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 559 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
560 | return; |
561 | } | |
562 | len = strlen(fn); | |
563 | ||
710585d4 ND |
564 | de = pde_subdir_find(parent, fn, len); |
565 | if (de) | |
566 | rb_erase(&de->subdir_node, &parent->subdir); | |
ecf1a3df | 567 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
568 | if (!de) { |
569 | WARN(1, "name '%s'\n", name); | |
570 | return; | |
571 | } | |
572 | ||
866ad9a7 | 573 | proc_entry_rundown(de); |
881adb85 | 574 | |
f649d6d3 AD |
575 | if (S_ISDIR(de->mode)) |
576 | parent->nlink--; | |
577 | de->nlink = 0; | |
710585d4 ND |
578 | WARN(pde_subdir_first(de), |
579 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
580 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 581 | pde_put(de); |
1da177e4 | 582 | } |
587d4a17 | 583 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
584 | |
585 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
586 | { | |
8ce584c7 AV |
587 | struct proc_dir_entry *root = NULL, *de, *next; |
588 | const char *fn = name; | |
589 | unsigned int len; | |
590 | ||
ecf1a3df | 591 | write_lock(&proc_subdir_lock); |
8ce584c7 | 592 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 593 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
594 | return -ENOENT; |
595 | } | |
596 | len = strlen(fn); | |
597 | ||
710585d4 | 598 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 | 599 | if (!root) { |
ecf1a3df | 600 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
601 | return -ENOENT; |
602 | } | |
710585d4 ND |
603 | rb_erase(&root->subdir_node, &parent->subdir); |
604 | ||
8ce584c7 AV |
605 | de = root; |
606 | while (1) { | |
710585d4 | 607 | next = pde_subdir_first(de); |
8ce584c7 | 608 | if (next) { |
710585d4 | 609 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
610 | de = next; |
611 | continue; | |
612 | } | |
ecf1a3df | 613 | write_unlock(&proc_subdir_lock); |
8ce584c7 | 614 | |
866ad9a7 | 615 | proc_entry_rundown(de); |
8ce584c7 AV |
616 | next = de->parent; |
617 | if (S_ISDIR(de->mode)) | |
618 | next->nlink--; | |
619 | de->nlink = 0; | |
620 | if (de == root) | |
621 | break; | |
622 | pde_put(de); | |
623 | ||
ecf1a3df | 624 | write_lock(&proc_subdir_lock); |
8ce584c7 AV |
625 | de = next; |
626 | } | |
627 | pde_put(root); | |
628 | return 0; | |
629 | } | |
630 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
631 | |
632 | void *proc_get_parent_data(const struct inode *inode) | |
633 | { | |
634 | struct proc_dir_entry *de = PDE(inode); | |
635 | return de->parent->data; | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
638 | |
639 | void proc_remove(struct proc_dir_entry *de) | |
640 | { | |
641 | if (de) | |
642 | remove_proc_subtree(de->name, de->parent); | |
643 | } | |
644 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
645 | |
646 | void *PDE_DATA(const struct inode *inode) | |
647 | { | |
648 | return __PDE_DATA(inode); | |
649 | } | |
650 | EXPORT_SYMBOL(PDE_DATA); |