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> |
fddda2b7 | 28 | #include <linux/seq_file.h> |
1da177e4 | 29 | |
fee781e6 AB |
30 | #include "internal.h" |
31 | ||
ecf1a3df | 32 | static DEFINE_RWLOCK(proc_subdir_lock); |
64a07bd8 | 33 | |
b4884f23 AD |
34 | struct kmem_cache *proc_dir_entry_cache __ro_after_init; |
35 | ||
36 | void pde_free(struct proc_dir_entry *pde) | |
37 | { | |
38 | if (S_ISLNK(pde->mode)) | |
39 | kfree(pde->data); | |
40 | if (pde->name != pde->inline_name) | |
41 | kfree(pde->name); | |
42 | kmem_cache_free(proc_dir_entry_cache, pde); | |
43 | } | |
44 | ||
93ad5bc6 | 45 | static int proc_match(const char *name, struct proc_dir_entry *de, unsigned int len) |
1da177e4 | 46 | { |
710585d4 ND |
47 | if (len < de->namelen) |
48 | return -1; | |
49 | if (len > de->namelen) | |
50 | return 1; | |
51 | ||
52 | return memcmp(name, de->name, len); | |
53 | } | |
54 | ||
55 | static struct proc_dir_entry *pde_subdir_first(struct proc_dir_entry *dir) | |
56 | { | |
4f113437 AD |
57 | return rb_entry_safe(rb_first(&dir->subdir), struct proc_dir_entry, |
58 | subdir_node); | |
710585d4 ND |
59 | } |
60 | ||
61 | static struct proc_dir_entry *pde_subdir_next(struct proc_dir_entry *dir) | |
62 | { | |
2fc1e948 ND |
63 | return rb_entry_safe(rb_next(&dir->subdir_node), struct proc_dir_entry, |
64 | subdir_node); | |
710585d4 ND |
65 | } |
66 | ||
67 | static struct proc_dir_entry *pde_subdir_find(struct proc_dir_entry *dir, | |
68 | const char *name, | |
69 | unsigned int len) | |
70 | { | |
4f113437 | 71 | struct rb_node *node = dir->subdir.rb_node; |
710585d4 ND |
72 | |
73 | while (node) { | |
4e4a7fb7 GT |
74 | struct proc_dir_entry *de = rb_entry(node, |
75 | struct proc_dir_entry, | |
76 | subdir_node); | |
93ad5bc6 | 77 | int result = proc_match(name, de, len); |
710585d4 ND |
78 | |
79 | if (result < 0) | |
80 | node = node->rb_left; | |
81 | else if (result > 0) | |
82 | node = node->rb_right; | |
83 | else | |
84 | return de; | |
85 | } | |
86 | return NULL; | |
87 | } | |
88 | ||
89 | static bool pde_subdir_insert(struct proc_dir_entry *dir, | |
90 | struct proc_dir_entry *de) | |
91 | { | |
4f113437 AD |
92 | struct rb_root *root = &dir->subdir; |
93 | struct rb_node **new = &root->rb_node, *parent = NULL; | |
710585d4 ND |
94 | |
95 | /* Figure out where to put new node */ | |
96 | while (*new) { | |
4e4a7fb7 GT |
97 | struct proc_dir_entry *this = rb_entry(*new, |
98 | struct proc_dir_entry, | |
99 | subdir_node); | |
93ad5bc6 | 100 | int result = proc_match(de->name, this, de->namelen); |
710585d4 ND |
101 | |
102 | parent = *new; | |
103 | if (result < 0) | |
104 | new = &(*new)->rb_left; | |
4f113437 | 105 | else if (result > 0) |
710585d4 | 106 | new = &(*new)->rb_right; |
4f113437 | 107 | else |
710585d4 ND |
108 | return false; |
109 | } | |
110 | ||
111 | /* Add new node and rebalance tree. */ | |
112 | rb_link_node(&de->subdir_node, parent, new); | |
4f113437 | 113 | rb_insert_color(&de->subdir_node, root); |
710585d4 | 114 | return true; |
1da177e4 LT |
115 | } |
116 | ||
1da177e4 LT |
117 | static int proc_notify_change(struct dentry *dentry, struct iattr *iattr) |
118 | { | |
2b0143b5 | 119 | struct inode *inode = d_inode(dentry); |
1da177e4 LT |
120 | struct proc_dir_entry *de = PDE(inode); |
121 | int error; | |
122 | ||
31051c85 | 123 | error = setattr_prepare(dentry, iattr); |
1da177e4 | 124 | if (error) |
1025774c | 125 | return error; |
1da177e4 | 126 | |
1025774c CH |
127 | setattr_copy(inode, iattr); |
128 | mark_inode_dirty(inode); | |
46f69557 | 129 | |
cdf7e8dd | 130 | proc_set_user(de, inode->i_uid, inode->i_gid); |
1da177e4 | 131 | de->mode = inode->i_mode; |
1025774c | 132 | return 0; |
1da177e4 LT |
133 | } |
134 | ||
a528d35e DH |
135 | static int proc_getattr(const struct path *path, struct kstat *stat, |
136 | u32 request_mask, unsigned int query_flags) | |
2b579bee | 137 | { |
a528d35e | 138 | struct inode *inode = d_inode(path->dentry); |
6bee55f9 | 139 | struct proc_dir_entry *de = PDE(inode); |
2b579bee | 140 | if (de && de->nlink) |
bfe86848 | 141 | set_nlink(inode, de->nlink); |
2b579bee MS |
142 | |
143 | generic_fillattr(inode, stat); | |
144 | return 0; | |
145 | } | |
146 | ||
c5ef1c42 | 147 | static const struct inode_operations proc_file_inode_operations = { |
1da177e4 LT |
148 | .setattr = proc_notify_change, |
149 | }; | |
150 | ||
151 | /* | |
152 | * This function parses a name such as "tty/driver/serial", and | |
153 | * returns the struct proc_dir_entry for "/proc/tty/driver", and | |
154 | * returns "serial" in residual. | |
155 | */ | |
e17a5765 AD |
156 | static int __xlate_proc_name(const char *name, struct proc_dir_entry **ret, |
157 | const char **residual) | |
1da177e4 LT |
158 | { |
159 | const char *cp = name, *next; | |
160 | struct proc_dir_entry *de; | |
312ec7e5 | 161 | unsigned int len; |
1da177e4 | 162 | |
7cee4e00 AD |
163 | de = *ret; |
164 | if (!de) | |
165 | de = &proc_root; | |
166 | ||
1da177e4 LT |
167 | while (1) { |
168 | next = strchr(cp, '/'); | |
169 | if (!next) | |
170 | break; | |
171 | ||
172 | len = next - cp; | |
710585d4 | 173 | de = pde_subdir_find(de, cp, len); |
12bac0d9 AD |
174 | if (!de) { |
175 | WARN(1, "name '%s'\n", name); | |
e17a5765 | 176 | return -ENOENT; |
12bac0d9 | 177 | } |
1da177e4 LT |
178 | cp += len + 1; |
179 | } | |
180 | *residual = cp; | |
181 | *ret = de; | |
e17a5765 AD |
182 | return 0; |
183 | } | |
184 | ||
185 | static int xlate_proc_name(const char *name, struct proc_dir_entry **ret, | |
186 | const char **residual) | |
187 | { | |
188 | int rv; | |
189 | ||
ecf1a3df | 190 | read_lock(&proc_subdir_lock); |
e17a5765 | 191 | rv = __xlate_proc_name(name, ret, residual); |
ecf1a3df | 192 | read_unlock(&proc_subdir_lock); |
e17a5765 | 193 | return rv; |
1da177e4 LT |
194 | } |
195 | ||
9a185409 | 196 | static DEFINE_IDA(proc_inum_ida); |
1da177e4 | 197 | |
67935df4 | 198 | #define PROC_DYNAMIC_FIRST 0xF0000000U |
1da177e4 LT |
199 | |
200 | /* | |
201 | * Return an inode number between PROC_DYNAMIC_FIRST and | |
202 | * 0xffffffff, or zero on failure. | |
203 | */ | |
33d6dce6 | 204 | int proc_alloc_inum(unsigned int *inum) |
1da177e4 | 205 | { |
cde1b693 | 206 | int i; |
1da177e4 | 207 | |
cde1b693 HK |
208 | i = ida_simple_get(&proc_inum_ida, 0, UINT_MAX - PROC_DYNAMIC_FIRST + 1, |
209 | GFP_KERNEL); | |
210 | if (i < 0) | |
211 | return i; | |
1da177e4 | 212 | |
cde1b693 | 213 | *inum = PROC_DYNAMIC_FIRST + (unsigned int)i; |
33d6dce6 | 214 | return 0; |
1da177e4 LT |
215 | } |
216 | ||
33d6dce6 | 217 | void proc_free_inum(unsigned int inum) |
1da177e4 | 218 | { |
cde1b693 | 219 | ida_simple_remove(&proc_inum_ida, inum - PROC_DYNAMIC_FIRST); |
1da177e4 LT |
220 | } |
221 | ||
1da4d377 AD |
222 | static int proc_misc_d_revalidate(struct dentry *dentry, unsigned int flags) |
223 | { | |
224 | if (flags & LOOKUP_RCU) | |
225 | return -ECHILD; | |
226 | ||
227 | if (atomic_read(&PDE(d_inode(dentry))->in_use) < 0) | |
228 | return 0; /* revalidate */ | |
229 | return 1; | |
230 | } | |
231 | ||
232 | static int proc_misc_d_delete(const struct dentry *dentry) | |
233 | { | |
234 | return atomic_read(&PDE(d_inode(dentry))->in_use) < 0; | |
235 | } | |
236 | ||
237 | static const struct dentry_operations proc_misc_dentry_ops = { | |
238 | .d_revalidate = proc_misc_d_revalidate, | |
239 | .d_delete = proc_misc_d_delete, | |
240 | }; | |
241 | ||
1da177e4 LT |
242 | /* |
243 | * Don't create negative dentries here, return -ENOENT by hand | |
244 | * instead. | |
245 | */ | |
93ad5bc6 AD |
246 | struct dentry *proc_lookup_de(struct inode *dir, struct dentry *dentry, |
247 | struct proc_dir_entry *de) | |
1da177e4 | 248 | { |
d3d009cb | 249 | struct inode *inode; |
1da177e4 | 250 | |
ecf1a3df | 251 | read_lock(&proc_subdir_lock); |
710585d4 ND |
252 | de = pde_subdir_find(de, dentry->d_name.name, dentry->d_name.len); |
253 | if (de) { | |
254 | pde_get(de); | |
ecf1a3df | 255 | read_unlock(&proc_subdir_lock); |
710585d4 ND |
256 | inode = proc_get_inode(dir->i_sb, de); |
257 | if (!inode) | |
258 | return ERR_PTR(-ENOMEM); | |
1fde6f21 | 259 | d_set_d_op(dentry, de->proc_dops); |
888e2b03 | 260 | return d_splice_alias(inode, dentry); |
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 | ||
8d48b2e0 | 289 | i = ctx->pos - 2; |
ecf1a3df | 290 | read_lock(&proc_subdir_lock); |
710585d4 | 291 | de = pde_subdir_first(de); |
f0c3b509 AV |
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 | } | |
f0c3b509 | 312 | ctx->pos++; |
8d48b2e0 | 313 | read_lock(&proc_subdir_lock); |
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 | ||
61172eae CH |
349 | /* returns the registered entry, or frees dp and returns NULL on failure */ |
350 | struct proc_dir_entry *proc_register(struct proc_dir_entry *dir, | |
351 | struct proc_dir_entry *dp) | |
1da177e4 | 352 | { |
61172eae CH |
353 | if (proc_alloc_inum(&dp->low_ino)) |
354 | goto out_free_entry; | |
64a07bd8 | 355 | |
ecf1a3df | 356 | write_lock(&proc_subdir_lock); |
99fc06df | 357 | dp->parent = dir; |
b208d54b | 358 | if (pde_subdir_insert(dir, dp) == false) { |
710585d4 ND |
359 | WARN(1, "proc_dir_entry '%s/%s' already registered\n", |
360 | dir->name, dp->name); | |
ecf1a3df | 361 | write_unlock(&proc_subdir_lock); |
61172eae | 362 | goto out_free_inum; |
b208d54b | 363 | } |
ecf1a3df | 364 | write_unlock(&proc_subdir_lock); |
99fc06df | 365 | |
61172eae CH |
366 | return dp; |
367 | out_free_inum: | |
368 | proc_free_inum(dp->low_ino); | |
369 | out_free_entry: | |
370 | pde_free(dp); | |
371 | return NULL; | |
1da177e4 LT |
372 | } |
373 | ||
2d3a4e36 | 374 | static struct proc_dir_entry *__proc_create(struct proc_dir_entry **parent, |
1da177e4 | 375 | const char *name, |
d161a13f | 376 | umode_t mode, |
1da177e4 LT |
377 | nlink_t nlink) |
378 | { | |
379 | struct proc_dir_entry *ent = NULL; | |
dbcdb504 AD |
380 | const char *fn; |
381 | struct qstr qstr; | |
1da177e4 | 382 | |
7cee4e00 | 383 | if (xlate_proc_name(name, parent, &fn) != 0) |
1da177e4 | 384 | goto out; |
dbcdb504 AD |
385 | qstr.name = fn; |
386 | qstr.len = strlen(fn); | |
387 | if (qstr.len == 0 || qstr.len >= 256) { | |
388 | WARN(1, "name len %u\n", qstr.len); | |
389 | return NULL; | |
390 | } | |
b77d70db AD |
391 | if (qstr.len == 1 && fn[0] == '.') { |
392 | WARN(1, "name '.'\n"); | |
393 | return NULL; | |
394 | } | |
395 | if (qstr.len == 2 && fn[0] == '.' && fn[1] == '.') { | |
396 | WARN(1, "name '..'\n"); | |
397 | return NULL; | |
398 | } | |
dbcdb504 AD |
399 | if (*parent == &proc_root && name_to_int(&qstr) != ~0U) { |
400 | WARN(1, "create '/proc/%s' by hand\n", qstr.name); | |
401 | return NULL; | |
402 | } | |
eb6d38d5 EB |
403 | if (is_empty_pde(*parent)) { |
404 | WARN(1, "attempt to add to permanently empty directory"); | |
405 | return NULL; | |
406 | } | |
1da177e4 | 407 | |
b4884f23 | 408 | ent = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL); |
17baa2a2 | 409 | if (!ent) |
410 | goto out; | |
1da177e4 | 411 | |
24074a35 | 412 | if (qstr.len + 1 <= SIZEOF_PDE_INLINE_NAME) { |
b4884f23 AD |
413 | ent->name = ent->inline_name; |
414 | } else { | |
415 | ent->name = kmalloc(qstr.len + 1, GFP_KERNEL); | |
416 | if (!ent->name) { | |
417 | pde_free(ent); | |
418 | return NULL; | |
419 | } | |
420 | } | |
421 | ||
dbcdb504 AD |
422 | memcpy(ent->name, fn, qstr.len + 1); |
423 | ent->namelen = qstr.len; | |
1da177e4 LT |
424 | ent->mode = mode; |
425 | ent->nlink = nlink; | |
4f113437 | 426 | ent->subdir = RB_ROOT; |
9cdd83e3 | 427 | refcount_set(&ent->refcnt, 1); |
786d7e16 | 428 | spin_lock_init(&ent->pde_unload_lock); |
881adb85 | 429 | INIT_LIST_HEAD(&ent->pde_openers); |
c110486f DT |
430 | proc_set_user(ent, (*parent)->uid, (*parent)->gid); |
431 | ||
1fde6f21 AD |
432 | ent->proc_dops = &proc_misc_dentry_ops; |
433 | ||
17baa2a2 | 434 | out: |
1da177e4 LT |
435 | return ent; |
436 | } | |
437 | ||
438 | struct proc_dir_entry *proc_symlink(const char *name, | |
439 | struct proc_dir_entry *parent, const char *dest) | |
440 | { | |
441 | struct proc_dir_entry *ent; | |
442 | ||
2d3a4e36 | 443 | ent = __proc_create(&parent, name, |
1da177e4 LT |
444 | (S_IFLNK | S_IRUGO | S_IWUGO | S_IXUGO),1); |
445 | ||
446 | if (ent) { | |
447 | ent->data = kmalloc((ent->size=strlen(dest))+1, GFP_KERNEL); | |
448 | if (ent->data) { | |
449 | strcpy((char*)ent->data,dest); | |
d443b9fd | 450 | ent->proc_iops = &proc_link_inode_operations; |
61172eae | 451 | ent = proc_register(parent, ent); |
1da177e4 | 452 | } else { |
b4884f23 | 453 | pde_free(ent); |
1da177e4 LT |
454 | ent = NULL; |
455 | } | |
456 | } | |
457 | return ent; | |
458 | } | |
587d4a17 | 459 | EXPORT_SYMBOL(proc_symlink); |
1da177e4 | 460 | |
270b5ac2 DH |
461 | struct proc_dir_entry *proc_mkdir_data(const char *name, umode_t mode, |
462 | struct proc_dir_entry *parent, void *data) | |
1da177e4 LT |
463 | { |
464 | struct proc_dir_entry *ent; | |
465 | ||
270b5ac2 DH |
466 | if (mode == 0) |
467 | mode = S_IRUGO | S_IXUGO; | |
468 | ||
2d3a4e36 | 469 | ent = __proc_create(&parent, name, S_IFDIR | mode, 2); |
1da177e4 | 470 | if (ent) { |
270b5ac2 | 471 | ent->data = data; |
d443b9fd AV |
472 | ent->proc_fops = &proc_dir_operations; |
473 | ent->proc_iops = &proc_dir_inode_operations; | |
474 | parent->nlink++; | |
61172eae CH |
475 | ent = proc_register(parent, ent); |
476 | if (!ent) | |
d443b9fd | 477 | parent->nlink--; |
1da177e4 LT |
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++; |
61172eae CH |
508 | ent = proc_register(parent, ent); |
509 | if (!ent) | |
eb6d38d5 | 510 | parent->nlink--; |
eb6d38d5 EB |
511 | } |
512 | return ent; | |
513 | } | |
f97df70b | 514 | EXPORT_SYMBOL(proc_create_mount_point); |
eb6d38d5 | 515 | |
7aed53d1 CH |
516 | struct proc_dir_entry *proc_create_reg(const char *name, umode_t mode, |
517 | struct proc_dir_entry **parent, void *data) | |
2d3a4e36 | 518 | { |
7aed53d1 CH |
519 | struct proc_dir_entry *p; |
520 | ||
b6cdc731 AV |
521 | if ((mode & S_IFMT) == 0) |
522 | mode |= S_IFREG; | |
7aed53d1 CH |
523 | if ((mode & S_IALLUGO) == 0) |
524 | mode |= S_IRUGO; | |
525 | if (WARN_ON_ONCE(!S_ISREG(mode))) | |
b6cdc731 | 526 | return NULL; |
7aed53d1 CH |
527 | |
528 | p = __proc_create(parent, name, mode, 1); | |
529 | if (p) { | |
530 | p->proc_iops = &proc_file_inode_operations; | |
531 | p->data = data; | |
2d3a4e36 | 532 | } |
7aed53d1 CH |
533 | return p; |
534 | } | |
535 | ||
536 | struct proc_dir_entry *proc_create_data(const char *name, umode_t mode, | |
537 | struct proc_dir_entry *parent, | |
538 | const struct file_operations *proc_fops, void *data) | |
539 | { | |
540 | struct proc_dir_entry *p; | |
2d3a4e36 | 541 | |
d443b9fd AV |
542 | BUG_ON(proc_fops == NULL); |
543 | ||
7aed53d1 CH |
544 | p = proc_create_reg(name, mode, &parent, data); |
545 | if (!p) | |
546 | return NULL; | |
547 | p->proc_fops = proc_fops; | |
548 | return proc_register(parent, p); | |
2d3a4e36 | 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 | ||
fddda2b7 CH |
560 | static int proc_seq_open(struct inode *inode, struct file *file) |
561 | { | |
562 | struct proc_dir_entry *de = PDE(inode); | |
563 | ||
44414d82 CH |
564 | if (de->state_size) |
565 | return seq_open_private(file, de->seq_ops, de->state_size); | |
fddda2b7 CH |
566 | return seq_open(file, de->seq_ops); |
567 | } | |
568 | ||
877f919e CH |
569 | static int proc_seq_release(struct inode *inode, struct file *file) |
570 | { | |
571 | struct proc_dir_entry *de = PDE(inode); | |
572 | ||
573 | if (de->state_size) | |
574 | return seq_release_private(inode, file); | |
575 | return seq_release(inode, file); | |
576 | } | |
577 | ||
fddda2b7 CH |
578 | static const struct file_operations proc_seq_fops = { |
579 | .open = proc_seq_open, | |
580 | .read = seq_read, | |
581 | .llseek = seq_lseek, | |
877f919e | 582 | .release = proc_seq_release, |
fddda2b7 CH |
583 | }; |
584 | ||
44414d82 | 585 | struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode, |
fddda2b7 | 586 | struct proc_dir_entry *parent, const struct seq_operations *ops, |
44414d82 | 587 | unsigned int state_size, void *data) |
fddda2b7 CH |
588 | { |
589 | struct proc_dir_entry *p; | |
590 | ||
591 | p = proc_create_reg(name, mode, &parent, data); | |
592 | if (!p) | |
593 | return NULL; | |
594 | p->proc_fops = &proc_seq_fops; | |
595 | p->seq_ops = ops; | |
44414d82 | 596 | p->state_size = state_size; |
fddda2b7 CH |
597 | return proc_register(parent, p); |
598 | } | |
44414d82 | 599 | EXPORT_SYMBOL(proc_create_seq_private); |
fddda2b7 | 600 | |
3f3942ac CH |
601 | static int proc_single_open(struct inode *inode, struct file *file) |
602 | { | |
603 | struct proc_dir_entry *de = PDE(inode); | |
604 | ||
605 | return single_open(file, de->single_show, de->data); | |
606 | } | |
607 | ||
608 | static const struct file_operations proc_single_fops = { | |
609 | .open = proc_single_open, | |
610 | .read = seq_read, | |
611 | .llseek = seq_lseek, | |
612 | .release = single_release, | |
613 | }; | |
614 | ||
615 | struct proc_dir_entry *proc_create_single_data(const char *name, umode_t mode, | |
616 | struct proc_dir_entry *parent, | |
617 | int (*show)(struct seq_file *, void *), void *data) | |
618 | { | |
619 | struct proc_dir_entry *p; | |
620 | ||
621 | p = proc_create_reg(name, mode, &parent, data); | |
622 | if (!p) | |
623 | return NULL; | |
624 | p->proc_fops = &proc_single_fops; | |
625 | p->single_show = show; | |
626 | return proc_register(parent, p); | |
627 | } | |
628 | EXPORT_SYMBOL(proc_create_single_data); | |
629 | ||
271a15ea DH |
630 | void proc_set_size(struct proc_dir_entry *de, loff_t size) |
631 | { | |
632 | de->size = size; | |
633 | } | |
634 | EXPORT_SYMBOL(proc_set_size); | |
635 | ||
636 | void proc_set_user(struct proc_dir_entry *de, kuid_t uid, kgid_t gid) | |
637 | { | |
638 | de->uid = uid; | |
639 | de->gid = gid; | |
640 | } | |
641 | EXPORT_SYMBOL(proc_set_user); | |
2d3a4e36 | 642 | |
135d5655 AD |
643 | void pde_put(struct proc_dir_entry *pde) |
644 | { | |
9cdd83e3 | 645 | if (refcount_dec_and_test(&pde->refcnt)) { |
b4884f23 AD |
646 | proc_free_inum(pde->low_ino); |
647 | pde_free(pde); | |
648 | } | |
135d5655 AD |
649 | } |
650 | ||
8ce584c7 AV |
651 | /* |
652 | * Remove a /proc entry and free it if it's not currently in use. | |
653 | */ | |
654 | void remove_proc_entry(const char *name, struct proc_dir_entry *parent) | |
655 | { | |
8ce584c7 AV |
656 | struct proc_dir_entry *de = NULL; |
657 | const char *fn = name; | |
658 | unsigned int len; | |
659 | ||
ecf1a3df | 660 | write_lock(&proc_subdir_lock); |
8ce584c7 | 661 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 662 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
663 | return; |
664 | } | |
665 | len = strlen(fn); | |
666 | ||
710585d4 ND |
667 | de = pde_subdir_find(parent, fn, len); |
668 | if (de) | |
4f113437 | 669 | rb_erase(&de->subdir_node, &parent->subdir); |
ecf1a3df | 670 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
671 | if (!de) { |
672 | WARN(1, "name '%s'\n", name); | |
673 | return; | |
674 | } | |
675 | ||
866ad9a7 | 676 | proc_entry_rundown(de); |
881adb85 | 677 | |
f649d6d3 AD |
678 | if (S_ISDIR(de->mode)) |
679 | parent->nlink--; | |
680 | de->nlink = 0; | |
710585d4 ND |
681 | WARN(pde_subdir_first(de), |
682 | "%s: removing non-empty directory '%s/%s', leaking at least '%s'\n", | |
683 | __func__, de->parent->name, de->name, pde_subdir_first(de)->name); | |
135d5655 | 684 | pde_put(de); |
1da177e4 | 685 | } |
587d4a17 | 686 | EXPORT_SYMBOL(remove_proc_entry); |
8ce584c7 AV |
687 | |
688 | int remove_proc_subtree(const char *name, struct proc_dir_entry *parent) | |
689 | { | |
8ce584c7 AV |
690 | struct proc_dir_entry *root = NULL, *de, *next; |
691 | const char *fn = name; | |
692 | unsigned int len; | |
693 | ||
ecf1a3df | 694 | write_lock(&proc_subdir_lock); |
8ce584c7 | 695 | if (__xlate_proc_name(name, &parent, &fn) != 0) { |
ecf1a3df | 696 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
697 | return -ENOENT; |
698 | } | |
699 | len = strlen(fn); | |
700 | ||
710585d4 | 701 | root = pde_subdir_find(parent, fn, len); |
8ce584c7 | 702 | if (!root) { |
ecf1a3df | 703 | write_unlock(&proc_subdir_lock); |
8ce584c7 AV |
704 | return -ENOENT; |
705 | } | |
4f113437 | 706 | rb_erase(&root->subdir_node, &parent->subdir); |
710585d4 | 707 | |
8ce584c7 AV |
708 | de = root; |
709 | while (1) { | |
710585d4 | 710 | next = pde_subdir_first(de); |
8ce584c7 | 711 | if (next) { |
4f113437 | 712 | rb_erase(&next->subdir_node, &de->subdir); |
8ce584c7 AV |
713 | de = next; |
714 | continue; | |
715 | } | |
ecf1a3df | 716 | write_unlock(&proc_subdir_lock); |
8ce584c7 | 717 | |
866ad9a7 | 718 | proc_entry_rundown(de); |
8ce584c7 AV |
719 | next = de->parent; |
720 | if (S_ISDIR(de->mode)) | |
721 | next->nlink--; | |
722 | de->nlink = 0; | |
723 | if (de == root) | |
724 | break; | |
725 | pde_put(de); | |
726 | ||
ecf1a3df | 727 | write_lock(&proc_subdir_lock); |
8ce584c7 AV |
728 | de = next; |
729 | } | |
730 | pde_put(root); | |
731 | return 0; | |
732 | } | |
733 | EXPORT_SYMBOL(remove_proc_subtree); | |
4a520d27 DH |
734 | |
735 | void *proc_get_parent_data(const struct inode *inode) | |
736 | { | |
737 | struct proc_dir_entry *de = PDE(inode); | |
738 | return de->parent->data; | |
739 | } | |
740 | EXPORT_SYMBOL_GPL(proc_get_parent_data); | |
a8ca16ea DH |
741 | |
742 | void proc_remove(struct proc_dir_entry *de) | |
743 | { | |
744 | if (de) | |
745 | remove_proc_subtree(de->name, de->parent); | |
746 | } | |
747 | EXPORT_SYMBOL(proc_remove); | |
c30480b9 DH |
748 | |
749 | void *PDE_DATA(const struct inode *inode) | |
750 | { | |
751 | return __PDE_DATA(inode); | |
752 | } | |
753 | EXPORT_SYMBOL(PDE_DATA); | |
564def71 DH |
754 | |
755 | /* | |
756 | * Pull a user buffer into memory and pass it to the file's write handler if | |
757 | * one is supplied. The ->write() method is permitted to modify the | |
758 | * kernel-side buffer. | |
759 | */ | |
760 | ssize_t proc_simple_write(struct file *f, const char __user *ubuf, size_t size, | |
761 | loff_t *_pos) | |
762 | { | |
763 | struct proc_dir_entry *pde = PDE(file_inode(f)); | |
764 | char *buf; | |
765 | int ret; | |
766 | ||
767 | if (!pde->write) | |
768 | return -EACCES; | |
769 | if (size == 0 || size > PAGE_SIZE - 1) | |
770 | return -EINVAL; | |
771 | buf = memdup_user_nul(ubuf, size); | |
772 | if (IS_ERR(buf)) | |
773 | return PTR_ERR(buf); | |
774 | ret = pde->write(f, buf, size); | |
775 | kfree(buf); | |
776 | return ret == 0 ? size : ret; | |
777 | } |