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> |
1da4d377 | 18 | #include <linux/namei.h> |
5a0e3ad6 | 19 | #include <linux/slab.h> |
87ebdc00 | 20 | #include <linux/printk.h> |
1da177e4 | 21 | #include <linux/mount.h> |
1da177e4 LT |
22 | #include <linux/init.h> |
23 | #include <linux/idr.h> | |
1da177e4 | 24 | #include <linux/bitops.h> |
64a07bd8 | 25 | #include <linux/spinlock.h> |
786d7e16 | 26 | #include <linux/completion.h> |
7c0f6ba6 | 27 | #include <linux/uaccess.h> |
1da177e4 | 28 | |
fee781e6 AB |
29 | #include "internal.h" |
30 | ||
ecf1a3df | 31 | static DEFINE_RWLOCK(proc_subdir_lock); |
64a07bd8 | 32 | |
b4884f23 AD |
33 | struct kmem_cache *proc_dir_entry_cache __ro_after_init; |
34 | ||
35 | void pde_free(struct proc_dir_entry *pde) | |
36 | { | |
37 | if (S_ISLNK(pde->mode)) | |
38 | kfree(pde->data); | |
39 | if (pde->name != pde->inline_name) | |
40 | kfree(pde->name); | |
41 | kmem_cache_free(proc_dir_entry_cache, pde); | |
42 | } | |
43 | ||
93ad5bc6 | 44 | static int proc_match(const char *name, struct proc_dir_entry *de, unsigned int len) |
1da177e4 | 45 | { |
710585d4 ND |
46 | if (len < de->namelen) |
47 | return -1; | |
48 | if (len > de->namelen) | |
49 | return 1; | |
50 | ||
51 | return memcmp(name, de->name, len); | |
52 | } | |
53 | ||
54 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) | |
55 | { | |
4f113437 AD |
56 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
57 | subdir_node); | |
710585d4 ND |
58 | } |
59 | ||
60 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) | |
61 | { | |
2fc1e948 ND |
62 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
63 | subdir_node); | |
710585d4 ND |
64 | } |
65 | ||
66 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, | |
67 | const char *name, | |
68 | unsigned int len) | |
69 | { | |
4f113437 | 70 | struct rb_node *node = dir->subdir.rb_node; |
710585d4 ND |
71 | |
72 | while (node) { | |
4e4a7fb7 GT |
73 | struct proc_dir_entry *de = rb_entry(node, |
74 | struct proc_dir_entry, | |
75 | subdir_node); | |
93ad5bc6 | 76 | int result = proc_match(name, de, len); |
710585d4 ND |
77 | |
78 | if (result < 0) | |
79 | node = node->rb_left; | |
80 | else if (result > 0) | |
81 | node = node->rb_right; | |
82 | else | |
83 | return de; | |
84 | } | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | static bool pde_subdir_insert(struct proc_dir_entry *dir, | |
89 | struct proc_dir_entry *de) | |
90 | { | |
4f113437 AD |
91 | struct rb_root *root = &dir->subdir; |
92 | struct rb_node **new = &root->rb_node, *parent = NULL; | |
710585d4 ND |
93 | |
94 | /* Figure out where to put new node */ | |
95 | while (*new) { | |
4e4a7fb7 GT |
96 | struct proc_dir_entry *this = rb_entry(*new, |
97 | struct proc_dir_entry, | |
98 | subdir_node); | |
93ad5bc6 | 99 | int result = proc_match(de->name, this, de->namelen); |
710585d4 ND |
100 | |
101 | parent = *new; | |
102 | if (result < 0) | |
103 | new = &(*new)->rb_left; | |
4f113437 | 104 | else if (result > 0) |
710585d4 | 105 | new = &(*new)->rb_right; |
4f113437 | 106 | else |
710585d4 ND |
107 | return false; |
108 | } | |
109 | ||
110 | /* Add new node and rebalance tree. */ | |
111 | rb_link_node(&de->subdir_node, parent, new); | |
4f113437 | 112 | rb_insert_color(&de->subdir_node, root); |
710585d4 | 113 | return true; |
1da177e4 LT |
114 | } |
115 | ||
1da177e4 LT |
116 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
117 | { | |
2b0143b5 | 118 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
119 | struct proc_dir_entry *de = PDE(inode); |
120 | int error; | |
121 | ||
31051c85 | 122 | error = setattr_prepare(dentry, iattr); |
1da177e4 | 123 | if (error) |
1025774c | 124 | return error; |
1da177e4 | 125 | |
1025774c CH |
126 | setattr_copy(inode, iattr); |
127 | mark_inode_dirty(inode); | |
46f69557 | 128 | |
cdf7e8dd | 129 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 130 | de->mode = inode->i_mode; |
1025774c | 131 | return 0; |
1da177e4 LT |
132 | } |
133 | ||
a528d35e DH |
134 | static int proc_getattr(const struct path *path, struct kstat *stat, |
135 | u32 request_mask, unsigned int query_flags) | |
2b579bee | 136 | { |
a528d35e | 137 | struct inode *inode = d_inode(path->dentry); |
6bee55f9 | 138 | struct proc_dir_entry *de = PDE(inode); |
2b579bee | 139 | if (de && de->nlink) |
bfe86848 | 140 | set_nlink(inode, de->nlink); |
2b579bee MS |
141 | |
142 | generic_fillattr(inode, stat); | |
143 | return 0; | |
144 | } | |
145 | ||
c5ef1c42 | 146 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
147 | .setattr = proc_notify_change, |
148 | }; | |
149 | ||
150 | /* | |
151 | * This function parses a name such as "tty/driver/serial", and | |
152 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
153 | * returns "serial" in residual. | |
154 | */ | |
e17a5765 AD |
155 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
156 | const char **residual) | |
1da177e4 LT |
157 | { |
158 | const char *cp = name, *next; | |
159 | struct proc_dir_entry *de; | |
312ec7e5 | 160 | unsigned int len; |
1da177e4 | 161 | |
7cee4e00 AD |
162 | de = *ret; |
163 | if (!de) | |
164 | de = &proc_root; | |
165 | ||
1da177e4 LT |
166 | while (1) { |
167 | next = strchr(cp, '/'); | |
168 | if (!next) | |
169 | break; | |
170 | ||
171 | len = next - cp; | |
710585d4 | 172 | de = pde_subdir_find(de, cp, len); |
12bac0d9 AD |
173 | if (!de) { |
174 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 175 | return -ENOENT; |
12bac0d9 | 176 | } |
1da177e4 LT |
177 | cp += len + 1; |
178 | } | |
179 | *residual = cp; | |
180 | *ret = de; | |
e17a5765 AD |
181 | return 0; |
182 | } | |
183 | ||
184 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
185 | const char **residual) | |
186 | { | |
187 | int rv; | |
188 | ||
ecf1a3df | 189 | read_lock(&proc_subdir_lock); |
e17a5765 | 190 | rv = __xlate_proc_name(name, ret, residual); |
ecf1a3df | 191 | read_unlock(&proc_subdir_lock); |
e17a5765 | 192 | return rv; |
1da177e4 LT |
193 | } |
194 | ||
9a185409 | 195 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 | 196 | |
67935df4 | 197 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
198 | |
199 | /* | |
200 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
201 | * 0xffffffff, or zero on failure. | |
202 | */ | |
33d6dce6 | 203 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 204 | { |
cde1b693 | 205 | int i; |
1da177e4 | 206 | |
cde1b693 HK |
207 | i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1, |
208 | GFP_KERNEL); | |
209 | if (i < 0) | |
210 | return i; | |
1da177e4 | 211 | |
cde1b693 | 212 | *inum = PROC_DYNAMIC_FIRST + (unsigned int)i; |
33d6dce6 | 213 | return 0; |
1da177e4 LT |
214 | } |
215 | ||
33d6dce6 | 216 | void proc_free_inum(unsigned int inum) |
1da177e4 | 217 | { |
cde1b693 | 218 | ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
1da177e4 LT |
219 | } |
220 | ||
1da4d377 AD |
221 | static int proc_misc_d_revalidate(struct dentry *dentry, unsigned int flags) |
222 | { | |
223 | if (flags & LOOKUP_RCU) | |
224 | return -ECHILD; | |
225 | ||
226 | if (atomic_read(&PDE(d_inode(dentry))->in_use) < 0) | |
227 | return 0; /* revalidate */ | |
228 | return 1; | |
229 | } | |
230 | ||
231 | static int proc_misc_d_delete(const struct dentry *dentry) | |
232 | { | |
233 | return atomic_read(&PDE(d_inode(dentry))->in_use) < 0; | |
234 | } | |
235 | ||
236 | static const struct dentry_operations proc_misc_dentry_ops = { | |
237 | .d_revalidate = proc_misc_d_revalidate, | |
238 | .d_delete = proc_misc_d_delete, | |
239 | }; | |
240 | ||
1da177e4 LT |
241 | /* |
242 | * Don't create negative dentries here, return -ENOENT by hand | |
243 | * instead. | |
244 | */ | |
93ad5bc6 AD |
245 | struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry, |
246 | struct proc_dir_entry *de) | |
1da177e4 | 247 | { |
d3d009cb | 248 | struct inode *inode; |
1da177e4 | 249 | |
ecf1a3df | 250 | read_lock(&proc_subdir_lock); |
710585d4 ND |
251 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
252 | if (de) { | |
253 | pde_get(de); | |
ecf1a3df | 254 | read_unlock(&proc_subdir_lock); |
710585d4 ND |
255 | inode = proc_get_inode(dir->i_sb, de); |
256 | if (!inode) | |
257 | return ERR_PTR(-ENOMEM); | |
1da4d377 | 258 | d_set_d_op(dentry, &proc_misc_dentry_ops); |
710585d4 ND |
259 | d_add(dentry, inode); |
260 | return NULL; | |
1da177e4 | 261 | } |
ecf1a3df | 262 | read_unlock(&proc_subdir_lock); |
d3d009cb | 263 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
264 | } |
265 | ||
e9720acd | 266 | struct dentry *proc_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 267 | unsigned int flags) |
e9720acd | 268 | { |
93ad5bc6 | 269 | return proc_lookup_de(dir, dentry, PDE(dir)); |
e9720acd PE |
270 | } |
271 | ||
1da177e4 LT |
272 | /* |
273 | * This returns non-zero if at EOF, so that the /proc | |
274 | * root directory can use this and check if it should | |
275 | * continue with the <pid> entries.. | |
276 | * | |
277 | * Note that the VFS-layer doesn't care about the return | |
278 | * value of the readdir() call, as long as it's non-negative | |
279 | * for success.. | |
280 | */ | |
93ad5bc6 AD |
281 | int proc_readdir_de(struct file *file, struct dir_context *ctx, |
282 | struct proc_dir_entry *de) | |
1da177e4 | 283 | { |
1da177e4 | 284 | int i; |
f0c3b509 AV |
285 | |
286 | if (!dir_emit_dots(file, ctx)) | |
287 | return 0; | |
288 | ||
ecf1a3df | 289 | read_lock(&proc_subdir_lock); |
710585d4 | 290 | de = pde_subdir_first(de); |
f0c3b509 AV |
291 | i = ctx->pos - 2; |
292 | for (;;) { | |
293 | if (!de) { | |
ecf1a3df | 294 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
295 | return 0; |
296 | } | |
297 | if (!i) | |
298 | break; | |
710585d4 | 299 | de = pde_subdir_next(de); |
f0c3b509 | 300 | i--; |
1da177e4 | 301 | } |
f0c3b509 AV |
302 | |
303 | do { | |
304 | struct proc_dir_entry *next; | |
305 | pde_get(de); | |
ecf1a3df | 306 | read_unlock(&proc_subdir_lock); |
f0c3b509 AV |
307 | if (!dir_emit(ctx, de->name, de->namelen, |
308 | de->low_ino, de->mode >> 12)) { | |
309 | pde_put(de); | |
310 | return 0; | |
311 | } | |
ecf1a3df | 312 | read_lock(&proc_subdir_lock); |
f0c3b509 | 313 | ctx->pos++; |
710585d4 | 314 | next = pde_subdir_next(de); |
f0c3b509 AV |
315 | pde_put(de); |
316 | de = next; | |
317 | } while (de); | |
ecf1a3df | 318 | read_unlock(&proc_subdir_lock); |
fd3930f7 | 319 | return 1; |
1da177e4 LT |
320 | } |
321 | ||
f0c3b509 | 322 | int proc_readdir(struct file *file, struct dir_context *ctx) |
e9720acd | 323 | { |
f0c3b509 | 324 | struct inode *inode = file_inode(file); |
e9720acd | 325 | |
93ad5bc6 | 326 | return proc_readdir_de(file, ctx, PDE(inode)); |
e9720acd PE |
327 | } |
328 | ||
1da177e4 LT |
329 | /* |
330 | * These are the generic /proc directory operations. They | |
331 | * use the in-memory "struct proc_dir_entry" tree to parse | |
332 | * the /proc directory. | |
333 | */ | |
00977a59 | 334 | static const struct file_operations proc_dir_operations = { |
b4df2b92 | 335 | .llseek = generic_file_llseek, |
1da177e4 | 336 | .read = generic_read_dir, |
f50752ea | 337 | .iterate_shared = proc_readdir, |
1da177e4 LT |
338 | }; |
339 | ||
340 | /* | |
341 | * proc directories can do almost nothing.. | |
342 | */ | |
c5ef1c42 | 343 | static const struct inode_operations proc_dir_inode_operations = { |
1da177e4 | 344 | .lookup = proc_lookup, |
2b579bee | 345 | .getattr = proc_getattr, |
1da177e4 LT |
346 | .setattr = proc_notify_change, |
347 | }; | |
348 | ||
349 | static int proc_register(struct proc_dir_entry * dir, struct proc_dir_entry * dp) | |
350 | { | |
33d6dce6 | 351 | int ret; |
710585d4 | 352 | |
33d6dce6 EB |
353 | ret = proc_alloc_inum(&dp->low_ino); |
354 | if (ret) | |
355 | return ret; | |
64a07bd8 | 356 | |
ecf1a3df | 357 | write_lock(&proc_subdir_lock); |
99fc06df | 358 | dp->parent = dir; |
b208d54b | 359 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
360 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
361 | dir->name, dp->name); | |
ecf1a3df | 362 | write_unlock(&proc_subdir_lock); |
b208d54b DB |
363 | proc_free_inum(dp->low_ino); |
364 | return -EEXIST; | |
365 | } | |
ecf1a3df | 366 | write_unlock(&proc_subdir_lock); |
99fc06df | 367 | |
1da177e4 LT |
368 | return 0; |
369 | } | |
370 | ||
2d3a4e36 | 371 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 372 | const char *name, |
d161a13f | 373 | umode_t mode, |
1da177e4 LT |
374 | nlink_t nlink) |
375 | { | |
376 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
377 | const char *fn; |
378 | struct qstr qstr; | |
1da177e4 | 379 | |
7cee4e00 | 380 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 381 | goto out; |
dbcdb504 AD |
382 | qstr.name = fn; |
383 | qstr.len = strlen(fn); | |
384 | if (qstr.len == 0 || qstr.len >= 256) { | |
385 | WARN(1, "name len %u\n", qstr.len); | |
386 | return NULL; | |
387 | } | |
b77d70db AD |
388 | if (qstr.len == 1 && fn[0] == '.') { |
389 | WARN(1, "name '.'\n"); | |
390 | return NULL; | |
391 | } | |
392 | if (qstr.len == 2 && fn[0] == '.' && fn[1] == '.') { | |
393 | WARN(1, "name '..'\n"); | |
394 | return NULL; | |
395 | } | |
dbcdb504 AD |
396 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { |
397 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
398 | return NULL; | |
399 | } | |
eb6d38d5 EB |
400 | if (is_empty_pde(*parent)) { |
401 | WARN(1, "attempt to add to permanently empty directory"); | |
402 | return NULL; | |
403 | } | |
1da177e4 | 404 | |
b4884f23 | 405 | ent = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL); |
17baa2a2 | 406 | if (!ent) |
407 | goto out; | |
1da177e4 | 408 | |
b4884f23 AD |
409 | if (qstr.len + 1 <= sizeof(ent->inline_name)) { |
410 | ent->name = ent->inline_name; | |
411 | } else { | |
412 | ent->name = kmalloc(qstr.len + 1, GFP_KERNEL); | |
413 | if (!ent->name) { | |
414 | pde_free(ent); | |
415 | return NULL; | |
416 | } | |
417 | } | |
418 | ||
dbcdb504 AD |
419 | memcpy(ent->name, fn, qstr.len + 1); |
420 | ent->namelen = qstr.len; | |
1da177e4 LT |
421 | ent->mode = mode; |
422 | ent->nlink = nlink; | |
4f113437 | 423 | ent->subdir = RB_ROOT; |
9cdd83e3 | 424 | refcount_set(&ent->refcnt, 1); |
786d7e16 | 425 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 426 | INIT_LIST_HEAD(&ent->pde_openers); |
c110486f DT |
427 | proc_set_user(ent, (*parent)->uid, (*parent)->gid); |
428 | ||
17baa2a2 | 429 | out: |
1da177e4 LT |
430 | return ent; |
431 | } | |
432 | ||
433 | struct proc_dir_entry *proc_symlink(const char *name, | |
434 | struct proc_dir_entry *parent, const char *dest) | |
435 | { | |
436 | struct proc_dir_entry *ent; | |
437 | ||
2d3a4e36 | 438 | ent = __proc_create(&parent, name, |
1da177e4 LT |
439 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
440 | ||
441 | if (ent) { | |
442 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
443 | if (ent->data) { | |
444 | strcpy((char*)ent->data,dest); | |
d443b9fd | 445 | ent->proc_iops = &proc_link_inode_operations; |
1da177e4 | 446 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 447 | pde_free(ent); |
1da177e4 LT |
448 | ent = NULL; |
449 | } | |
450 | } else { | |
b4884f23 | 451 | pde_free(ent); |
1da177e4 LT |
452 | ent = NULL; |
453 | } | |
454 | } | |
455 | return ent; | |
456 | } | |
587d4a17 | 457 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 458 | |
270b5ac2 DH |
459 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
460 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
461 | { |
462 | struct proc_dir_entry *ent; | |
463 | ||
270b5ac2 DH |
464 | if (mode == 0) |
465 | mode = S_IRUGO | S_IXUGO; | |
466 | ||
2d3a4e36 | 467 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 468 | if (ent) { |
270b5ac2 | 469 | ent->data = data; |
d443b9fd AV |
470 | ent->proc_fops = &proc_dir_operations; |
471 | ent->proc_iops = &proc_dir_inode_operations; | |
472 | parent->nlink++; | |
1da177e4 | 473 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 474 | pde_free(ent); |
d443b9fd | 475 | parent->nlink--; |
1da177e4 LT |
476 | ent = NULL; |
477 | } | |
478 | } | |
479 | return ent; | |
480 | } | |
270b5ac2 | 481 | EXPORT_SYMBOL_GPL(proc_mkdir_data); |
1da177e4 | 482 | |
270b5ac2 DH |
483 | struct proc_dir_entry *proc_mkdir_mode(const char *name, umode_t mode, |
484 | struct proc_dir_entry *parent) | |
78e92b99 | 485 | { |
270b5ac2 | 486 | return proc_mkdir_data(name, mode, parent, NULL); |
78e92b99 | 487 | } |
270b5ac2 | 488 | EXPORT_SYMBOL(proc_mkdir_mode); |
78e92b99 | 489 | |
1da177e4 LT |
490 | struct proc_dir_entry *proc_mkdir(const char *name, |
491 | struct proc_dir_entry *parent) | |
492 | { | |
270b5ac2 | 493 | return proc_mkdir_data(name, 0, parent, NULL); |
1da177e4 | 494 | } |
587d4a17 | 495 | EXPORT_SYMBOL(proc_mkdir); |
1da177e4 | 496 | |
eb6d38d5 EB |
497 | struct proc_dir_entry *proc_create_mount_point(const char *name) |
498 | { | |
499 | umode_t mode = S_IFDIR | S_IRUGO | S_IXUGO; | |
500 | struct proc_dir_entry *ent, *parent = NULL; | |
501 | ||
502 | ent = __proc_create(&parent, name, mode, 2); | |
503 | if (ent) { | |
504 | ent->data = NULL; | |
505 | ent->proc_fops = NULL; | |
506 | ent->proc_iops = NULL; | |
d66bb160 | 507 | parent->nlink++; |
eb6d38d5 | 508 | if (proc_register(parent, ent) < 0) { |
b4884f23 | 509 | pde_free(ent); |
eb6d38d5 EB |
510 | parent->nlink--; |
511 | ent = NULL; | |
512 | } | |
513 | } | |
514 | return ent; | |
515 | } | |
f97df70b | 516 | EXPORT_SYMBOL(proc_create_mount_point); |
eb6d38d5 | 517 | |
d161a13f | 518 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, |
59b74351 DL |
519 | struct proc_dir_entry *parent, |
520 | const struct file_operations *proc_fops, | |
521 | void *data) | |
2d3a4e36 AD |
522 | { |
523 | struct proc_dir_entry *pde; | |
b6cdc731 AV |
524 | if ((mode & S_IFMT) == 0) |
525 | mode |= S_IFREG; | |
2d3a4e36 | 526 | |
b6cdc731 AV |
527 | if (!S_ISREG(mode)) { |
528 | WARN_ON(1); /* use proc_mkdir() */ | |
529 | return NULL; | |
2d3a4e36 AD |
530 | } |
531 | ||
d443b9fd AV |
532 | BUG_ON(proc_fops == NULL); |
533 | ||
b6cdc731 AV |
534 | if ((mode & S_IALLUGO) == 0) |
535 | mode |= S_IRUGO; | |
536 | pde = __proc_create(&parent, name, mode, 1); | |
2d3a4e36 AD |
537 | if (!pde) |
538 | goto out; | |
539 | pde->proc_fops = proc_fops; | |
59b74351 | 540 | pde->data = data; |
d443b9fd | 541 | pde->proc_iops = &proc_file_inode_operations; |
2d3a4e36 AD |
542 | if (proc_register(parent, pde) < 0) |
543 | goto out_free; | |
544 | return pde; | |
545 | out_free: | |
b4884f23 | 546 | pde_free(pde); |
2d3a4e36 AD |
547 | out: |
548 | return NULL; | |
549 | } | |
587d4a17 | 550 | EXPORT_SYMBOL(proc_create_data); |
271a15ea | 551 | |
855d9765 AD |
552 | struct proc_dir_entry *proc_create(const char *name, umode_t mode, |
553 | struct proc_dir_entry *parent, | |
554 | const struct file_operations *proc_fops) | |
555 | { | |
556 | return proc_create_data(name, mode, parent, proc_fops, NULL); | |
557 | } | |
558 | EXPORT_SYMBOL(proc_create); | |
559 | ||
271a15ea DH |
560 | void proc_set_size(struct proc_dir_entry *de, loff_t size) |
561 | { | |
562 | de->size = size; | |
563 | } | |
564 | EXPORT_SYMBOL(proc_set_size); | |
565 | ||
566 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
567 | { | |
568 | de->uid = uid; | |
569 | de->gid = gid; | |
570 | } | |
571 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 572 | |
135d5655 AD |
573 | void pde_put(struct proc_dir_entry *pde) |
574 | { | |
9cdd83e3 | 575 | if (refcount_dec_and_test(&pde->refcnt)) { |
b4884f23 AD |
576 | proc_free_inum(pde->low_ino); |
577 | pde_free(pde); | |
578 | } | |
135d5655 AD |
579 | } |
580 | ||
8ce584c7 AV |
581 | /* |
582 | * Remove a /proc entry and free it if it's not currently in use. | |
583 | */ | |
584 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
585 | { | |
8ce584c7 AV |
586 | struct proc_dir_entry *de = NULL; |
587 | const char *fn = name; | |
588 | unsigned int len; | |
589 | ||
ecf1a3df | 590 | write_lock(&proc_subdir_lock); |
8ce584c7 | 591 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 592 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
593 | return; |
594 | } | |
595 | len = strlen(fn); | |
596 | ||
710585d4 ND |
597 | de = pde_subdir_find(parent, fn, len); |
598 | if (de) | |
4f113437 | 599 | rb_erase(&de->subdir_node, &parent->subdir); |
ecf1a3df | 600 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
601 | if (!de) { |
602 | WARN(1, "name '%s'\n", name); | |
603 | return; | |
604 | } | |
605 | ||
866ad9a7 | 606 | proc_entry_rundown(de); |
881adb85 | 607 | |
f649d6d3 AD |
608 | if (S_ISDIR(de->mode)) |
609 | parent->nlink--; | |
610 | de->nlink = 0; | |
710585d4 ND |
611 | WARN(pde_subdir_first(de), |
612 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
613 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 614 | pde_put(de); |
1da177e4 | 615 | } |
587d4a17 | 616 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
617 | |
618 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
619 | { | |
8ce584c7 AV |
620 | struct proc_dir_entry *root = NULL, *de, *next; |
621 | const char *fn = name; | |
622 | unsigned int len; | |
623 | ||
ecf1a3df | 624 | write_lock(&proc_subdir_lock); |
8ce584c7 | 625 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 626 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
627 | return -ENOENT; |
628 | } | |
629 | len = strlen(fn); | |
630 | ||
710585d4 | 631 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 | 632 | if (!root) { |
ecf1a3df | 633 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
634 | return -ENOENT; |
635 | } | |
4f113437 | 636 | rb_erase(&root->subdir_node, &parent->subdir); |
710585d4 | 637 | |
8ce584c7 AV |
638 | de = root; |
639 | while (1) { | |
710585d4 | 640 | next = pde_subdir_first(de); |
8ce584c7 | 641 | if (next) { |
4f113437 | 642 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
643 | de = next; |
644 | continue; | |
645 | } | |
ecf1a3df | 646 | write_unlock(&proc_subdir_lock); |
8ce584c7 | 647 | |
866ad9a7 | 648 | proc_entry_rundown(de); |
8ce584c7 AV |
649 | next = de->parent; |
650 | if (S_ISDIR(de->mode)) | |
651 | next->nlink--; | |
652 | de->nlink = 0; | |
653 | if (de == root) | |
654 | break; | |
655 | pde_put(de); | |
656 | ||
ecf1a3df | 657 | write_lock(&proc_subdir_lock); |
8ce584c7 AV |
658 | de = next; |
659 | } | |
660 | pde_put(root); | |
661 | return 0; | |
662 | } | |
663 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
664 | |
665 | void *proc_get_parent_data(const struct inode *inode) | |
666 | { | |
667 | struct proc_dir_entry *de = PDE(inode); | |
668 | return de->parent->data; | |
669 | } | |
670 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
671 | |
672 | void proc_remove(struct proc_dir_entry *de) | |
673 | { | |
674 | if (de) | |
675 | remove_proc_subtree(de->name, de->parent); | |
676 | } | |
677 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
678 | |
679 | void *PDE_DATA(const struct inode *inode) | |
680 | { | |
681 | return __PDE_DATA(inode); | |
682 | } | |
683 | EXPORT_SYMBOL(PDE_DATA); |