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 | ||
b4884f23 | 11 | #include <linux/cache.h> |
1da177e4 LT |
12 | #include <linux/errno.h> |
13 | #include <linux/time.h> | |
14 | #include <linux/proc_fs.h> | |
15 | #include <linux/stat.h> | |
1025774c | 16 | #include <linux/mm.h> |
1da177e4 | 17 | #include <linux/module.h> |
5a0e3ad6 | 18 | #include <linux/slab.h> |
87ebdc00 | 19 | #include <linux/printk.h> |
1da177e4 | 20 | #include <linux/mount.h> |
1da177e4 LT |
21 | #include <linux/init.h> |
22 | #include <linux/idr.h> | |
1da177e4 | 23 | #include <linux/bitops.h> |
64a07bd8 | 24 | #include <linux/spinlock.h> |
786d7e16 | 25 | #include <linux/completion.h> |
7c0f6ba6 | 26 | #include <linux/uaccess.h> |
1da177e4 | 27 | |
fee781e6 AB |
28 | #include "internal.h" |
29 | ||
ecf1a3df | 30 | static DEFINE_RWLOCK(proc_subdir_lock); |
64a07bd8 | 31 | |
b4884f23 AD |
32 | struct kmem_cache *proc_dir_entry_cache __ro_after_init; |
33 | ||
34 | void pde_free(struct proc_dir_entry *pde) | |
35 | { | |
36 | if (S_ISLNK(pde->mode)) | |
37 | kfree(pde->data); | |
38 | if (pde->name != pde->inline_name) | |
39 | kfree(pde->name); | |
40 | kmem_cache_free(proc_dir_entry_cache, pde); | |
41 | } | |
42 | ||
93ad5bc6 | 43 | static int proc_match(const char *name, struct proc_dir_entry *de, unsigned int len) |
1da177e4 | 44 | { |
710585d4 ND |
45 | if (len < de->namelen) |
46 | return -1; | |
47 | if (len > de->namelen) | |
48 | return 1; | |
49 | ||
50 | return memcmp(name, de->name, len); | |
51 | } | |
52 | ||
53 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) | |
54 | { | |
4f113437 AD |
55 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
56 | subdir_node); | |
710585d4 ND |
57 | } |
58 | ||
59 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) | |
60 | { | |
2fc1e948 ND |
61 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
62 | subdir_node); | |
710585d4 ND |
63 | } |
64 | ||
65 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, | |
66 | const char *name, | |
67 | unsigned int len) | |
68 | { | |
4f113437 | 69 | struct rb_node *node = dir->subdir.rb_node; |
710585d4 ND |
70 | |
71 | while (node) { | |
4e4a7fb7 GT |
72 | struct proc_dir_entry *de = rb_entry(node, |
73 | struct proc_dir_entry, | |
74 | subdir_node); | |
93ad5bc6 | 75 | int result = proc_match(name, de, len); |
710585d4 ND |
76 | |
77 | if (result < 0) | |
78 | node = node->rb_left; | |
79 | else if (result > 0) | |
80 | node = node->rb_right; | |
81 | else | |
82 | return de; | |
83 | } | |
84 | return NULL; | |
85 | } | |
86 | ||
87 | static bool pde_subdir_insert(struct proc_dir_entry *dir, | |
88 | struct proc_dir_entry *de) | |
89 | { | |
4f113437 AD |
90 | struct rb_root *root = &dir->subdir; |
91 | struct rb_node **new = &root->rb_node, *parent = NULL; | |
710585d4 ND |
92 | |
93 | /* Figure out where to put new node */ | |
94 | while (*new) { | |
4e4a7fb7 GT |
95 | struct proc_dir_entry *this = rb_entry(*new, |
96 | struct proc_dir_entry, | |
97 | subdir_node); | |
93ad5bc6 | 98 | int result = proc_match(de->name, this, de->namelen); |
710585d4 ND |
99 | |
100 | parent = *new; | |
101 | if (result < 0) | |
102 | new = &(*new)->rb_left; | |
4f113437 | 103 | else if (result > 0) |
710585d4 | 104 | new = &(*new)->rb_right; |
4f113437 | 105 | else |
710585d4 ND |
106 | return false; |
107 | } | |
108 | ||
109 | /* Add new node and rebalance tree. */ | |
110 | rb_link_node(&de->subdir_node, parent, new); | |
4f113437 | 111 | rb_insert_color(&de->subdir_node, root); |
710585d4 | 112 | return true; |
1da177e4 LT |
113 | } |
114 | ||
1da177e4 LT |
115 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
116 | { | |
2b0143b5 | 117 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
118 | struct proc_dir_entry *de = PDE(inode); |
119 | int error; | |
120 | ||
31051c85 | 121 | error = setattr_prepare(dentry, iattr); |
1da177e4 | 122 | if (error) |
1025774c | 123 | return error; |
1da177e4 | 124 | |
1025774c CH |
125 | setattr_copy(inode, iattr); |
126 | mark_inode_dirty(inode); | |
46f69557 | 127 | |
cdf7e8dd | 128 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 129 | de->mode = inode->i_mode; |
1025774c | 130 | return 0; |
1da177e4 LT |
131 | } |
132 | ||
a528d35e DH |
133 | static int proc_getattr(const struct path *path, struct kstat *stat, |
134 | u32 request_mask, unsigned int query_flags) | |
2b579bee | 135 | { |
a528d35e | 136 | struct inode *inode = d_inode(path->dentry); |
6bee55f9 | 137 | struct proc_dir_entry *de = PDE(inode); |
2b579bee | 138 | if (de && de->nlink) |
bfe86848 | 139 | set_nlink(inode, de->nlink); |
2b579bee MS |
140 | |
141 | generic_fillattr(inode, stat); | |
142 | return 0; | |
143 | } | |
144 | ||
c5ef1c42 | 145 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
146 | .setattr = proc_notify_change, |
147 | }; | |
148 | ||
149 | /* | |
150 | * This function parses a name such as "tty/driver/serial", and | |
151 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
152 | * returns "serial" in residual. | |
153 | */ | |
e17a5765 AD |
154 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
155 | const char **residual) | |
1da177e4 LT |
156 | { |
157 | const char *cp = name, *next; | |
158 | struct proc_dir_entry *de; | |
312ec7e5 | 159 | unsigned int len; |
1da177e4 | 160 | |
7cee4e00 AD |
161 | de = *ret; |
162 | if (!de) | |
163 | de = &proc_root; | |
164 | ||
1da177e4 LT |
165 | while (1) { |
166 | next = strchr(cp, '/'); | |
167 | if (!next) | |
168 | break; | |
169 | ||
170 | len = next - cp; | |
710585d4 | 171 | de = pde_subdir_find(de, cp, len); |
12bac0d9 AD |
172 | if (!de) { |
173 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 174 | return -ENOENT; |
12bac0d9 | 175 | } |
1da177e4 LT |
176 | cp += len + 1; |
177 | } | |
178 | *residual = cp; | |
179 | *ret = de; | |
e17a5765 AD |
180 | return 0; |
181 | } | |
182 | ||
183 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
184 | const char **residual) | |
185 | { | |
186 | int rv; | |
187 | ||
ecf1a3df | 188 | read_lock(&proc_subdir_lock); |
e17a5765 | 189 | rv = __xlate_proc_name(name, ret, residual); |
ecf1a3df | 190 | read_unlock(&proc_subdir_lock); |
e17a5765 | 191 | return rv; |
1da177e4 LT |
192 | } |
193 | ||
9a185409 | 194 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 | 195 | |
67935df4 | 196 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
197 | |
198 | /* | |
199 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
200 | * 0xffffffff, or zero on failure. | |
201 | */ | |
33d6dce6 | 202 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 203 | { |
cde1b693 | 204 | int i; |
1da177e4 | 205 | |
cde1b693 HK |
206 | i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1, |
207 | GFP_KERNEL); | |
208 | if (i < 0) | |
209 | return i; | |
1da177e4 | 210 | |
cde1b693 | 211 | *inum = PROC_DYNAMIC_FIRST + (unsigned int)i; |
33d6dce6 | 212 | return 0; |
1da177e4 LT |
213 | } |
214 | ||
33d6dce6 | 215 | void proc_free_inum(unsigned int inum) |
1da177e4 | 216 | { |
cde1b693 | 217 | ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
1da177e4 LT |
218 | } |
219 | ||
1da177e4 LT |
220 | /* |
221 | * Don't create negative dentries here, return -ENOENT by hand | |
222 | * instead. | |
223 | */ | |
93ad5bc6 AD |
224 | struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry, |
225 | struct proc_dir_entry *de) | |
1da177e4 | 226 | { |
d3d009cb | 227 | struct inode *inode; |
1da177e4 | 228 | |
ecf1a3df | 229 | read_lock(&proc_subdir_lock); |
710585d4 ND |
230 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
231 | if (de) { | |
232 | pde_get(de); | |
ecf1a3df | 233 | read_unlock(&proc_subdir_lock); |
710585d4 ND |
234 | inode = proc_get_inode(dir->i_sb, de); |
235 | if (!inode) | |
236 | return ERR_PTR(-ENOMEM); | |
237 | d_set_d_op(dentry, &simple_dentry_operations); | |
238 | d_add(dentry, inode); | |
239 | return NULL; | |
1da177e4 | 240 | } |
ecf1a3df | 241 | read_unlock(&proc_subdir_lock); |
d3d009cb | 242 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
243 | } |
244 | ||
e9720acd | 245 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 246 | unsigned int flags) |
e9720acd | 247 | { |
93ad5bc6 | 248 | return proc_lookup_de(dir, dentry, PDE(dir)); |
e9720acd PE |
249 | } |
250 | ||
1da177e4 LT |
251 | /* |
252 | * This returns non-zero if at EOF, so that the /proc | |
253 | * root directory can use this and check if it should | |
254 | * continue with the <pid> entries.. | |
255 | * | |
256 | * Note that the VFS-layer doesn't care about the return | |
257 | * value of the readdir() call, as long as it's non-negative | |
258 | * for success.. | |
259 | */ | |
93ad5bc6 AD |
260 | int proc_readdir_de(struct file *file, struct dir_context *ctx, |
261 | struct proc_dir_entry *de) | |
1da177e4 | 262 | { |
1da177e4 | 263 | int i; |
f0c3b509 AV |
264 | |
265 | if (!dir_emit_dots(file, ctx)) | |
266 | return 0; | |
267 | ||
ecf1a3df | 268 | read_lock(&proc_subdir_lock); |
710585d4 | 269 | de = pde_subdir_first(de); |
f0c3b509 AV |
270 | i = ctx->pos - 2; |
271 | for (;;) { | |
272 | if (!de) { | |
ecf1a3df | 273 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
274 | return 0; |
275 | } | |
276 | if (!i) | |
277 | break; | |
710585d4 | 278 | de = pde_subdir_next(de); |
f0c3b509 | 279 | i--; |
1da177e4 | 280 | } |
f0c3b509 AV |
281 | |
282 | do { | |
283 | struct proc_dir_entry *next; | |
284 | pde_get(de); | |
ecf1a3df | 285 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
286 | if (!dir_emit(ctx, de->name, de->namelen, |
287 | de->low_ino, de->mode >> 12)) { | |
288 | pde_put(de); | |
289 | return 0; | |
290 | } | |
ecf1a3df | 291 | read_lock(&proc_subdir_lock); |
f0c3b509 | 292 | ctx->pos++; |
710585d4 | 293 | next = pde_subdir_next(de); |
f0c3b509 AV |
294 | pde_put(de); |
295 | de = next; | |
296 | } while (de); | |
ecf1a3df | 297 | read_unlock(&proc_subdir_lock); |
fd3930f7 | 298 | return 1; |
1da177e4 LT |
299 | } |
300 | ||
f0c3b509 | 301 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 302 | { |
f0c3b509 | 303 | struct inode *inode = file_inode(file); |
e9720acd | 304 | |
93ad5bc6 | 305 | return proc_readdir_de(file, ctx, PDE(inode)); |
e9720acd PE |
306 | } |
307 | ||
1da177e4 LT |
308 | /* |
309 | * These are the generic /proc directory operations. They | |
310 | * use the in-memory "struct proc_dir_entry" tree to parse | |
311 | * the /proc directory. | |
312 | */ | |
00977a59 | 313 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 314 | .llseek = generic_file_llseek, |
1da177e4 | 315 | .read = generic_read_dir, |
f50752ea | 316 | .iterate_shared = proc_readdir, |
1da177e4 LT |
317 | }; |
318 | ||
319 | /* | |
320 | * proc directories can do almost nothing.. | |
321 | */ | |
c5ef1c42 | 322 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 323 | .lookup = proc_lookup, |
2b579bee | 324 | .getattr = proc_getattr, |
1da177e4 LT |
325 | .setattr = proc_notify_change, |
326 | }; | |
327 | ||
328 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
329 | { | |
33d6dce6 | 330 | int ret; |
710585d4 | 331 | |
33d6dce6 EB |
332 | ret = proc_alloc_inum(&dp->low_ino); |
333 | if (ret) | |
334 | return ret; | |
64a07bd8 | 335 | |
ecf1a3df | 336 | write_lock(&proc_subdir_lock); |
99fc06df | 337 | dp->parent = dir; |
b208d54b | 338 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
339 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
340 | dir->name, dp->name); | |
ecf1a3df | 341 | write_unlock(&proc_subdir_lock); |
b208d54b DB |
342 | proc_free_inum(dp->low_ino); |
343 | return -EEXIST; | |
344 | } | |
ecf1a3df | 345 | write_unlock(&proc_subdir_lock); |
99fc06df | 346 | |
1da177e4 LT |
347 | return 0; |
348 | } | |
349 | ||
2d3a4e36 | 350 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 351 | const char *name, |
d161a13f | 352 | umode_t mode, |
1da177e4 LT |
353 | nlink_t nlink) |
354 | { | |
355 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
356 | const char *fn; |
357 | struct qstr qstr; | |
1da177e4 | 358 | |
7cee4e00 | 359 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 360 | goto out; |
dbcdb504 AD |
361 | qstr.name = fn; |
362 | qstr.len = strlen(fn); | |
363 | if (qstr.len == 0 || qstr.len >= 256) { | |
364 | WARN(1, "name len %u\n", qstr.len); | |
365 | return NULL; | |
366 | } | |
b77d70db AD |
367 | if (qstr.len == 1 && fn[0] == '.') { |
368 | WARN(1, "name '.'\n"); | |
369 | return NULL; | |
370 | } | |
371 | if (qstr.len == 2 && fn[0] == '.' && fn[1] == '.') { | |
372 | WARN(1, "name '..'\n"); | |
373 | return NULL; | |
374 | } | |
dbcdb504 AD |
375 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { |
376 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
377 | return NULL; | |
378 | } | |
eb6d38d5 EB |
379 | if (is_empty_pde(*parent)) { |
380 | WARN(1, "attempt to add to permanently empty directory"); | |
381 | return NULL; | |
382 | } | |
1da177e4 | 383 | |
b4884f23 | 384 | ent = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL); |
17baa2a2 | 385 | if (!ent) |
386 | goto out; | |
1da177e4 | 387 | |
b4884f23 AD |
388 | if (qstr.len + 1 <= sizeof(ent->inline_name)) { |
389 | ent->name = ent->inline_name; | |
390 | } else { | |
391 | ent->name = kmalloc(qstr.len + 1, GFP_KERNEL); | |
392 | if (!ent->name) { | |
393 | pde_free(ent); | |
394 | return NULL; | |
395 | } | |
396 | } | |
397 | ||
dbcdb504 AD |
398 | memcpy(ent->name, fn, qstr.len + 1); |
399 | ent->namelen = qstr.len; | |
1da177e4 LT |
400 | ent->mode = mode; |
401 | ent->nlink = nlink; | |
4f113437 | 402 | ent->subdir = RB_ROOT; |
9cdd83e3 | 403 | refcount_set(&ent->refcnt, 1); |
786d7e16 | 404 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 405 | INIT_LIST_HEAD(&ent->pde_openers); |
c110486f DT |
406 | proc_set_user(ent, (*parent)->uid, (*parent)->gid); |
407 | ||
17baa2a2 | 408 | out: |
1da177e4 LT |
409 | return ent; |
410 | } | |
411 | ||
412 | struct proc_dir_entry *proc_symlink(const char *name, | |
413 | struct proc_dir_entry *parent, const char *dest) | |
414 | { | |
415 | struct proc_dir_entry *ent; | |
416 | ||
2d3a4e36 | 417 | ent = __proc_create(&parent, name, |
1da177e4 LT |
418 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
419 | ||
420 | if (ent) { | |
421 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
422 | if (ent->data) { | |
423 | strcpy((char*)ent->data,dest); | |
d443b9fd | 424 | ent->proc_iops = &proc_link_inode_operations; |
1da177e4 | 425 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 426 | pde_free(ent); |
1da177e4 LT |
427 | ent = NULL; |
428 | } | |
429 | } else { | |
b4884f23 | 430 | pde_free(ent); |
1da177e4 LT |
431 | ent = NULL; |
432 | } | |
433 | } | |
434 | return ent; | |
435 | } | |
587d4a17 | 436 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 437 | |
270b5ac2 DH |
438 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
439 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
440 | { |
441 | struct proc_dir_entry *ent; | |
442 | ||
270b5ac2 DH |
443 | if (mode == 0) |
444 | mode = S_IRUGO | S_IXUGO; | |
445 | ||
2d3a4e36 | 446 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 447 | if (ent) { |
270b5ac2 | 448 | ent->data = data; |
d443b9fd AV |
449 | ent->proc_fops = &proc_dir_operations; |
450 | ent->proc_iops = &proc_dir_inode_operations; | |
451 | parent->nlink++; | |
1da177e4 | 452 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 453 | pde_free(ent); |
d443b9fd | 454 | parent->nlink--; |
1da177e4 LT |
455 | ent = NULL; |
456 | } | |
457 | } | |
458 | return ent; | |
459 | } | |
270b5ac2 | 460 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 461 | |
270b5ac2 DH |
462 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
463 | struct proc_dir_entry *parent) | |
78e92b99 | 464 | { |
270b5ac2 | 465 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 466 | } |
270b5ac2 | 467 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 468 | |
1da177e4 LT |
469 | struct proc_dir_entry *proc_mkdir(const char *name, |
470 | struct proc_dir_entry *parent) | |
471 | { | |
270b5ac2 | 472 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 473 | } |
587d4a17 | 474 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 475 | |
eb6d38d5 EB |
476 | struct proc_dir_entry *proc_create_mount_point(const char *name) |
477 | { | |
478 | umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
479 | struct proc_dir_entry *ent, *parent = NULL; | |
480 | ||
481 | ent = __proc_create(&parent, name, mode, 2); | |
482 | if (ent) { | |
483 | ent->data = NULL; | |
484 | ent->proc_fops = NULL; | |
485 | ent->proc_iops = NULL; | |
d66bb160 | 486 | parent->nlink++; |
eb6d38d5 | 487 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 488 | pde_free(ent); |
eb6d38d5 EB |
489 | parent->nlink--; |
490 | ent = NULL; | |
491 | } | |
492 | } | |
493 | return ent; | |
494 | } | |
f97df70b | 495 | EXPORT_SYMBOL(proc_create_mount_point); |
eb6d38d5 | 496 | |
d161a13f | 497 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
498 | struct proc_dir_entry *parent, |
499 | const struct file_operations *proc_fops, | |
500 | void *data) | |
2d3a4e36 AD |
501 | { |
502 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
503 | if ((mode & S_IFMT) == 0) |
504 | mode |= S_IFREG; | |
2d3a4e36 | 505 | |
b6cdc731 AV |
506 | if (!S_ISREG(mode)) { |
507 | WARN_ON(1); /* use proc_mkdir() */ | |
508 | return NULL; | |
2d3a4e36 AD |
509 | } |
510 | ||
d443b9fd AV |
511 | BUG_ON(proc_fops == NULL); |
512 | ||
b6cdc731 AV |
513 | if ((mode & S_IALLUGO) == 0) |
514 | mode |= S_IRUGO; | |
515 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
516 | if (!pde) |
517 | goto out; | |
518 | pde->proc_fops = proc_fops; | |
59b74351 | 519 | pde->data = data; |
d443b9fd | 520 | pde->proc_iops = &proc_file_inode_operations; |
2d3a4e36 AD |
521 | if (proc_register(parent, pde) < 0) |
522 | goto out_free; | |
523 | return pde; | |
524 | out_free: | |
b4884f23 | 525 | pde_free(pde); |
2d3a4e36 AD |
526 | out: |
527 | return NULL; | |
528 | } | |
587d4a17 | 529 | EXPORT_SYMBOL(proc_create_data); |
271a15ea | 530 | |
855d9765 AD |
531 | struct proc_dir_entry *proc_create(const char *name, umode_t mode, |
532 | struct proc_dir_entry *parent, | |
533 | const struct file_operations *proc_fops) | |
534 | { | |
535 | return proc_create_data(name, mode, parent, proc_fops, NULL); | |
536 | } | |
537 | EXPORT_SYMBOL(proc_create); | |
538 | ||
271a15ea DH |
539 | void proc_set_size(struct proc_dir_entry *de, loff_t size) |
540 | { | |
541 | de->size = size; | |
542 | } | |
543 | EXPORT_SYMBOL(proc_set_size); | |
544 | ||
545 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
546 | { | |
547 | de->uid = uid; | |
548 | de->gid = gid; | |
549 | } | |
550 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 551 | |
135d5655 AD |
552 | void pde_put(struct proc_dir_entry *pde) |
553 | { | |
9cdd83e3 | 554 | if (refcount_dec_and_test(&pde->refcnt)) { |
b4884f23 AD |
555 | proc_free_inum(pde->low_ino); |
556 | pde_free(pde); | |
557 | } | |
135d5655 AD |
558 | } |
559 | ||
8ce584c7 AV |
560 | /* |
561 | * Remove a /proc entry and free it if it's not currently in use. | |
562 | */ | |
563 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
564 | { | |
8ce584c7 AV |
565 | struct proc_dir_entry *de = NULL; |
566 | const char *fn = name; | |
567 | unsigned int len; | |
568 | ||
ecf1a3df | 569 | write_lock(&proc_subdir_lock); |
8ce584c7 | 570 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 571 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
572 | return; |
573 | } | |
574 | len = strlen(fn); | |
575 | ||
710585d4 ND |
576 | de = pde_subdir_find(parent, fn, len); |
577 | if (de) | |
4f113437 | 578 | rb_erase(&de->subdir_node, &parent->subdir); |
ecf1a3df | 579 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
580 | if (!de) { |
581 | WARN(1, "name '%s'\n", name); | |
582 | return; | |
583 | } | |
584 | ||
866ad9a7 | 585 | proc_entry_rundown(de); |
881adb85 | 586 | |
f649d6d3 AD |
587 | if (S_ISDIR(de->mode)) |
588 | parent->nlink--; | |
589 | de->nlink = 0; | |
710585d4 ND |
590 | WARN(pde_subdir_first(de), |
591 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
592 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 593 | pde_put(de); |
1da177e4 | 594 | } |
587d4a17 | 595 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
596 | |
597 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
598 | { | |
8ce584c7 AV |
599 | struct proc_dir_entry *root = NULL, *de, *next; |
600 | const char *fn = name; | |
601 | unsigned int len; | |
602 | ||
ecf1a3df | 603 | write_lock(&proc_subdir_lock); |
8ce584c7 | 604 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 605 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
606 | return -ENOENT; |
607 | } | |
608 | len = strlen(fn); | |
609 | ||
710585d4 | 610 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 | 611 | if (!root) { |
ecf1a3df | 612 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
613 | return -ENOENT; |
614 | } | |
4f113437 | 615 | rb_erase(&root->subdir_node, &parent->subdir); |
710585d4 | 616 | |
8ce584c7 AV |
617 | de = root; |
618 | while (1) { | |
710585d4 | 619 | next = pde_subdir_first(de); |
8ce584c7 | 620 | if (next) { |
4f113437 | 621 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
622 | de = next; |
623 | continue; | |
624 | } | |
ecf1a3df | 625 | write_unlock(&proc_subdir_lock); |
8ce584c7 | 626 | |
866ad9a7 | 627 | proc_entry_rundown(de); |
8ce584c7 AV |
628 | next = de->parent; |
629 | if (S_ISDIR(de->mode)) | |
630 | next->nlink--; | |
631 | de->nlink = 0; | |
632 | if (de == root) | |
633 | break; | |
634 | pde_put(de); | |
635 | ||
ecf1a3df | 636 | write_lock(&proc_subdir_lock); |
8ce584c7 AV |
637 | de = next; |
638 | } | |
639 | pde_put(root); | |
640 | return 0; | |
641 | } | |
642 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
643 | |
644 | void *proc_get_parent_data(const struct inode *inode) | |
645 | { | |
646 | struct proc_dir_entry *de = PDE(inode); | |
647 | return de->parent->data; | |
648 | } | |
649 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
650 | |
651 | void proc_remove(struct proc_dir_entry *de) | |
652 | { | |
653 | if (de) | |
654 | remove_proc_subtree(de->name, de->parent); | |
655 | } | |
656 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
657 | |
658 | void *PDE_DATA(const struct inode *inode) | |
659 | { | |
660 | return __PDE_DATA(inode); | |
661 | } | |
662 | EXPORT_SYMBOL(PDE_DATA); |