Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
6d66f5cd TH |
2 | * fs/sysfs/dir.c - sysfs core and dir operation implementation |
3 | * | |
4 | * Copyright (c) 2001-3 Patrick Mochel | |
5 | * Copyright (c) 2007 SUSE Linux Products GmbH | |
6 | * Copyright (c) 2007 Tejun Heo <teheo@suse.de> | |
7 | * | |
8 | * This file is released under the GPLv2. | |
9 | * | |
10 | * Please see Documentation/filesystems/sysfs.txt for more information. | |
1da177e4 LT |
11 | */ |
12 | ||
13 | #undef DEBUG | |
14 | ||
15 | #include <linux/fs.h> | |
16 | #include <linux/mount.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/kobject.h> | |
5f45f1a7 | 19 | #include <linux/namei.h> |
2b611bb7 | 20 | #include <linux/idr.h> |
8619f979 | 21 | #include <linux/completion.h> |
869512ab | 22 | #include <linux/mutex.h> |
c6f87733 | 23 | #include <linux/slab.h> |
4c3da220 | 24 | #include <linux/security.h> |
1da177e4 LT |
25 | #include "sysfs.h" |
26 | ||
3007e997 | 27 | DEFINE_MUTEX(sysfs_mutex); |
f7a75f0a | 28 | DEFINE_SPINLOCK(sysfs_assoc_lock); |
1da177e4 | 29 | |
f7a75f0a | 30 | static DEFINE_SPINLOCK(sysfs_ino_lock); |
2b611bb7 TH |
31 | static DEFINE_IDA(sysfs_ino_ida); |
32 | ||
0c73f18b TH |
33 | /** |
34 | * sysfs_link_sibling - link sysfs_dirent into sibling list | |
35 | * @sd: sysfs_dirent of interest | |
36 | * | |
37 | * Link @sd into its sibling list which starts from | |
bc747f37 | 38 | * sd->s_parent->s_dir.children. |
0c73f18b TH |
39 | * |
40 | * Locking: | |
3007e997 | 41 | * mutex_lock(sysfs_mutex) |
0c73f18b | 42 | */ |
41fc1c27 | 43 | static void sysfs_link_sibling(struct sysfs_dirent *sd) |
0c73f18b TH |
44 | { |
45 | struct sysfs_dirent *parent_sd = sd->s_parent; | |
46 | ||
4f72c0ca MP |
47 | struct rb_node **p; |
48 | struct rb_node *parent; | |
49 | ||
7f9838fd MP |
50 | if (sysfs_type(sd) == SYSFS_DIR) |
51 | parent_sd->s_dir.subdirs++; | |
52 | ||
a406f758 MP |
53 | p = &parent_sd->s_dir.inode_tree.rb_node; |
54 | parent = NULL; | |
55 | while (*p) { | |
56 | parent = *p; | |
57 | #define node rb_entry(parent, struct sysfs_dirent, inode_node) | |
58 | if (sd->s_ino < node->s_ino) { | |
59 | p = &node->inode_node.rb_left; | |
60 | } else if (sd->s_ino > node->s_ino) { | |
61 | p = &node->inode_node.rb_right; | |
62 | } else { | |
c4253cb0 HC |
63 | printk(KERN_CRIT "sysfs: inserting duplicate inode '%lx'\n", |
64 | (unsigned long) sd->s_ino); | |
a406f758 MP |
65 | BUG(); |
66 | } | |
67 | #undef node | |
3efa65b9 | 68 | } |
a406f758 MP |
69 | rb_link_node(&sd->inode_node, parent, p); |
70 | rb_insert_color(&sd->inode_node, &parent_sd->s_dir.inode_tree); | |
4f72c0ca MP |
71 | |
72 | p = &parent_sd->s_dir.name_tree.rb_node; | |
73 | parent = NULL; | |
74 | while (*p) { | |
75 | int c; | |
76 | parent = *p; | |
77 | #define node rb_entry(parent, struct sysfs_dirent, name_node) | |
78 | c = strcmp(sd->s_name, node->s_name); | |
79 | if (c < 0) { | |
80 | p = &node->name_node.rb_left; | |
81 | } else { | |
82 | p = &node->name_node.rb_right; | |
83 | } | |
84 | #undef node | |
85 | } | |
86 | rb_link_node(&sd->name_node, parent, p); | |
87 | rb_insert_color(&sd->name_node, &parent_sd->s_dir.name_tree); | |
0c73f18b TH |
88 | } |
89 | ||
90 | /** | |
91 | * sysfs_unlink_sibling - unlink sysfs_dirent from sibling list | |
92 | * @sd: sysfs_dirent of interest | |
93 | * | |
94 | * Unlink @sd from its sibling list which starts from | |
bc747f37 | 95 | * sd->s_parent->s_dir.children. |
0c73f18b TH |
96 | * |
97 | * Locking: | |
3007e997 | 98 | * mutex_lock(sysfs_mutex) |
0c73f18b | 99 | */ |
41fc1c27 | 100 | static void sysfs_unlink_sibling(struct sysfs_dirent *sd) |
0c73f18b | 101 | { |
7f9838fd MP |
102 | if (sysfs_type(sd) == SYSFS_DIR) |
103 | sd->s_parent->s_dir.subdirs--; | |
104 | ||
a406f758 | 105 | rb_erase(&sd->inode_node, &sd->s_parent->s_dir.inode_tree); |
4f72c0ca | 106 | rb_erase(&sd->name_node, &sd->s_parent->s_dir.name_tree); |
0c73f18b TH |
107 | } |
108 | ||
b6b4a439 TH |
109 | /** |
110 | * sysfs_get_active - get an active reference to sysfs_dirent | |
111 | * @sd: sysfs_dirent to get an active reference to | |
112 | * | |
113 | * Get an active reference of @sd. This function is noop if @sd | |
114 | * is NULL. | |
115 | * | |
116 | * RETURNS: | |
117 | * Pointer to @sd on success, NULL on failure. | |
118 | */ | |
e72ceb8c | 119 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd) |
b6b4a439 | 120 | { |
8619f979 TH |
121 | if (unlikely(!sd)) |
122 | return NULL; | |
123 | ||
124 | while (1) { | |
125 | int v, t; | |
126 | ||
127 | v = atomic_read(&sd->s_active); | |
128 | if (unlikely(v < 0)) | |
129 | return NULL; | |
130 | ||
131 | t = atomic_cmpxchg(&sd->s_active, v, v + 1); | |
846f9974 EB |
132 | if (likely(t == v)) { |
133 | rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_); | |
8619f979 | 134 | return sd; |
846f9974 | 135 | } |
8619f979 TH |
136 | if (t < 0) |
137 | return NULL; | |
138 | ||
139 | cpu_relax(); | |
b6b4a439 | 140 | } |
b6b4a439 TH |
141 | } |
142 | ||
143 | /** | |
144 | * sysfs_put_active - put an active reference to sysfs_dirent | |
145 | * @sd: sysfs_dirent to put an active reference to | |
146 | * | |
147 | * Put an active reference to @sd. This function is noop if @sd | |
148 | * is NULL. | |
149 | */ | |
e72ceb8c | 150 | void sysfs_put_active(struct sysfs_dirent *sd) |
b6b4a439 | 151 | { |
8619f979 TH |
152 | int v; |
153 | ||
154 | if (unlikely(!sd)) | |
155 | return; | |
156 | ||
846f9974 | 157 | rwsem_release(&sd->dep_map, 1, _RET_IP_); |
8619f979 TH |
158 | v = atomic_dec_return(&sd->s_active); |
159 | if (likely(v != SD_DEACTIVATED_BIAS)) | |
160 | return; | |
161 | ||
162 | /* atomic_dec_return() is a mb(), we'll always see the updated | |
58f2a4c7 | 163 | * sd->u.completion. |
8619f979 | 164 | */ |
58f2a4c7 | 165 | complete(sd->u.completion); |
b6b4a439 TH |
166 | } |
167 | ||
b6b4a439 TH |
168 | /** |
169 | * sysfs_deactivate - deactivate sysfs_dirent | |
170 | * @sd: sysfs_dirent to deactivate | |
171 | * | |
8619f979 | 172 | * Deny new active references and drain existing ones. |
b6b4a439 | 173 | */ |
fb6896da | 174 | static void sysfs_deactivate(struct sysfs_dirent *sd) |
b6b4a439 | 175 | { |
8619f979 TH |
176 | DECLARE_COMPLETION_ONSTACK(wait); |
177 | int v; | |
b6b4a439 | 178 | |
58f2a4c7 | 179 | BUG_ON(!(sd->s_flags & SYSFS_FLAG_REMOVED)); |
a2db6842 EB |
180 | |
181 | if (!(sysfs_type(sd) & SYSFS_ACTIVE_REF)) | |
182 | return; | |
183 | ||
58f2a4c7 | 184 | sd->u.completion = (void *)&wait; |
8619f979 | 185 | |
846f9974 | 186 | rwsem_acquire(&sd->dep_map, 0, 0, _RET_IP_); |
8619f979 | 187 | /* atomic_add_return() is a mb(), put_active() will always see |
58f2a4c7 | 188 | * the updated sd->u.completion. |
b6b4a439 | 189 | */ |
8619f979 TH |
190 | v = atomic_add_return(SD_DEACTIVATED_BIAS, &sd->s_active); |
191 | ||
846f9974 EB |
192 | if (v != SD_DEACTIVATED_BIAS) { |
193 | lock_contended(&sd->dep_map, _RET_IP_); | |
8619f979 | 194 | wait_for_completion(&wait); |
846f9974 | 195 | } |
8619f979 | 196 | |
846f9974 EB |
197 | lock_acquired(&sd->dep_map, _RET_IP_); |
198 | rwsem_release(&sd->dep_map, 1, _RET_IP_); | |
b6b4a439 TH |
199 | } |
200 | ||
42b37df6 | 201 | static int sysfs_alloc_ino(ino_t *pino) |
2b611bb7 TH |
202 | { |
203 | int ino, rc; | |
204 | ||
205 | retry: | |
206 | spin_lock(&sysfs_ino_lock); | |
207 | rc = ida_get_new_above(&sysfs_ino_ida, 2, &ino); | |
208 | spin_unlock(&sysfs_ino_lock); | |
209 | ||
210 | if (rc == -EAGAIN) { | |
211 | if (ida_pre_get(&sysfs_ino_ida, GFP_KERNEL)) | |
212 | goto retry; | |
213 | rc = -ENOMEM; | |
214 | } | |
215 | ||
216 | *pino = ino; | |
217 | return rc; | |
218 | } | |
219 | ||
220 | static void sysfs_free_ino(ino_t ino) | |
221 | { | |
222 | spin_lock(&sysfs_ino_lock); | |
223 | ida_remove(&sysfs_ino_ida, ino); | |
224 | spin_unlock(&sysfs_ino_lock); | |
225 | } | |
226 | ||
fa7f912a TH |
227 | void release_sysfs_dirent(struct sysfs_dirent * sd) |
228 | { | |
13b3086d TH |
229 | struct sysfs_dirent *parent_sd; |
230 | ||
231 | repeat: | |
3007e997 TH |
232 | /* Moving/renaming is always done while holding reference. |
233 | * sd->s_parent won't change beneath us. | |
234 | */ | |
13b3086d TH |
235 | parent_sd = sd->s_parent; |
236 | ||
b402d72c | 237 | if (sysfs_type(sd) == SYSFS_KOBJ_LINK) |
b1fc3d61 | 238 | sysfs_put(sd->s_symlink.target_sd); |
b402d72c | 239 | if (sysfs_type(sd) & SYSFS_COPY_NAME) |
0c096b50 | 240 | kfree(sd->s_name); |
4c3da220 EB |
241 | if (sd->s_iattr && sd->s_iattr->ia_secdata) |
242 | security_release_secctx(sd->s_iattr->ia_secdata, | |
243 | sd->s_iattr->ia_secdata_len); | |
fa7f912a | 244 | kfree(sd->s_iattr); |
2b611bb7 | 245 | sysfs_free_ino(sd->s_ino); |
fa7f912a | 246 | kmem_cache_free(sysfs_dir_cachep, sd); |
13b3086d TH |
247 | |
248 | sd = parent_sd; | |
249 | if (sd && atomic_dec_and_test(&sd->s_count)) | |
250 | goto repeat; | |
fa7f912a TH |
251 | } |
252 | ||
fe15ce44 | 253 | static int sysfs_dentry_delete(const struct dentry *dentry) |
e8f077c8 EB |
254 | { |
255 | struct sysfs_dirent *sd = dentry->d_fsdata; | |
256 | return !!(sd->s_flags & SYSFS_FLAG_REMOVED); | |
257 | } | |
258 | ||
259 | static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd) | |
260 | { | |
34286d66 | 261 | struct sysfs_dirent *sd; |
e8f077c8 EB |
262 | int is_dir; |
263 | ||
34286d66 NP |
264 | if (nd->flags & LOOKUP_RCU) |
265 | return -ECHILD; | |
266 | ||
267 | sd = dentry->d_fsdata; | |
e8f077c8 EB |
268 | mutex_lock(&sysfs_mutex); |
269 | ||
270 | /* The sysfs dirent has been deleted */ | |
271 | if (sd->s_flags & SYSFS_FLAG_REMOVED) | |
272 | goto out_bad; | |
273 | ||
832b6af1 EB |
274 | /* The sysfs dirent has been moved? */ |
275 | if (dentry->d_parent->d_fsdata != sd->s_parent) | |
276 | goto out_bad; | |
277 | ||
278 | /* The sysfs dirent has been renamed */ | |
279 | if (strcmp(dentry->d_name.name, sd->s_name) != 0) | |
280 | goto out_bad; | |
281 | ||
e8f077c8 EB |
282 | mutex_unlock(&sysfs_mutex); |
283 | out_valid: | |
284 | return 1; | |
285 | out_bad: | |
286 | /* Remove the dentry from the dcache hashes. | |
287 | * If this is a deleted dentry we use d_drop instead of d_delete | |
288 | * so sysfs doesn't need to cope with negative dentries. | |
832b6af1 EB |
289 | * |
290 | * If this is a dentry that has simply been renamed we | |
291 | * use d_drop to remove it from the dcache lookup on its | |
292 | * old parent. If this dentry persists later when a lookup | |
293 | * is performed at its new name the dentry will be readded | |
294 | * to the dcache hashes. | |
e8f077c8 EB |
295 | */ |
296 | is_dir = (sysfs_type(sd) == SYSFS_DIR); | |
297 | mutex_unlock(&sysfs_mutex); | |
298 | if (is_dir) { | |
299 | /* If we have submounts we must allow the vfs caches | |
300 | * to lie about the state of the filesystem to prevent | |
301 | * leaks and other nasty things. | |
302 | */ | |
303 | if (have_submounts(dentry)) | |
304 | goto out_valid; | |
305 | shrink_dcache_parent(dentry); | |
306 | } | |
307 | d_drop(dentry); | |
308 | return 0; | |
309 | } | |
310 | ||
28a027cf | 311 | static void sysfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
1da177e4 LT |
312 | { |
313 | struct sysfs_dirent * sd = dentry->d_fsdata; | |
314 | ||
5a26b79c | 315 | sysfs_put(sd); |
1da177e4 LT |
316 | iput(inode); |
317 | } | |
318 | ||
ee1ec329 | 319 | static const struct dentry_operations sysfs_dentry_ops = { |
e8f077c8 EB |
320 | .d_revalidate = sysfs_dentry_revalidate, |
321 | .d_delete = sysfs_dentry_delete, | |
28a027cf | 322 | .d_iput = sysfs_dentry_iput, |
1da177e4 LT |
323 | }; |
324 | ||
3e519038 | 325 | struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type) |
1da177e4 | 326 | { |
0c096b50 | 327 | char *dup_name = NULL; |
01da2425 | 328 | struct sysfs_dirent *sd; |
0c096b50 TH |
329 | |
330 | if (type & SYSFS_COPY_NAME) { | |
331 | name = dup_name = kstrdup(name, GFP_KERNEL); | |
332 | if (!name) | |
01da2425 | 333 | return NULL; |
0c096b50 | 334 | } |
1da177e4 | 335 | |
c3762229 | 336 | sd = kmem_cache_zalloc(sysfs_dir_cachep, GFP_KERNEL); |
1da177e4 | 337 | if (!sd) |
01da2425 | 338 | goto err_out1; |
1da177e4 | 339 | |
0c096b50 | 340 | if (sysfs_alloc_ino(&sd->s_ino)) |
01da2425 | 341 | goto err_out2; |
2b611bb7 | 342 | |
1da177e4 | 343 | atomic_set(&sd->s_count, 1); |
8619f979 | 344 | atomic_set(&sd->s_active, 0); |
a26cd722 | 345 | |
0c096b50 | 346 | sd->s_name = name; |
a26cd722 | 347 | sd->s_mode = mode; |
b402d72c | 348 | sd->s_flags = type; |
1da177e4 LT |
349 | |
350 | return sd; | |
0c096b50 | 351 | |
01da2425 | 352 | err_out2: |
0c096b50 | 353 | kmem_cache_free(sysfs_dir_cachep, sd); |
01da2425 AM |
354 | err_out1: |
355 | kfree(dup_name); | |
0c096b50 | 356 | return NULL; |
1da177e4 LT |
357 | } |
358 | ||
3007e997 | 359 | /** |
fb6896da TH |
360 | * sysfs_addrm_start - prepare for sysfs_dirent add/remove |
361 | * @acxt: pointer to sysfs_addrm_cxt to be used | |
362 | * @parent_sd: parent sysfs_dirent | |
3007e997 | 363 | * |
fb6896da TH |
364 | * This function is called when the caller is about to add or |
365 | * remove sysfs_dirent under @parent_sd. This function acquires | |
a16bbc34 | 366 | * sysfs_mutex. @acxt is used to keep and pass context to |
fb6896da | 367 | * other addrm functions. |
3007e997 TH |
368 | * |
369 | * LOCKING: | |
fb6896da | 370 | * Kernel thread context (may sleep). sysfs_mutex is locked on |
a16bbc34 | 371 | * return. |
3007e997 | 372 | */ |
fb6896da TH |
373 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
374 | struct sysfs_dirent *parent_sd) | |
b592fcfe | 375 | { |
fb6896da TH |
376 | memset(acxt, 0, sizeof(*acxt)); |
377 | acxt->parent_sd = parent_sd; | |
378 | ||
fb6896da | 379 | mutex_lock(&sysfs_mutex); |
fb6896da TH |
380 | } |
381 | ||
382 | /** | |
36ce6dad | 383 | * __sysfs_add_one - add sysfs_dirent to parent without warning |
fb6896da TH |
384 | * @acxt: addrm context to use |
385 | * @sd: sysfs_dirent to be added | |
386 | * | |
387 | * Get @acxt->parent_sd and set sd->s_parent to it and increment | |
181b2e4b TH |
388 | * nlink of parent inode if @sd is a directory and link into the |
389 | * children list of the parent. | |
fb6896da TH |
390 | * |
391 | * This function should be called between calls to | |
392 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be | |
393 | * passed the same @acxt as passed to sysfs_addrm_start(). | |
394 | * | |
395 | * LOCKING: | |
396 | * Determined by sysfs_addrm_start(). | |
23dc2799 TH |
397 | * |
398 | * RETURNS: | |
399 | * 0 on success, -EEXIST if entry with the given name already | |
400 | * exists. | |
fb6896da | 401 | */ |
36ce6dad | 402 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) |
fb6896da | 403 | { |
6b0bfe93 EB |
404 | struct sysfs_inode_attrs *ps_iattr; |
405 | ||
903e21e2 EB |
406 | if (!!sysfs_ns_type(acxt->parent_sd) != !!sd->s_ns) { |
407 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", | |
408 | sysfs_ns_type(acxt->parent_sd)? "required": "invalid", | |
409 | acxt->parent_sd->s_name, sd->s_name); | |
410 | return -EINVAL; | |
411 | } | |
412 | ||
3ff195b0 | 413 | if (sysfs_find_dirent(acxt->parent_sd, sd->s_ns, sd->s_name)) |
23dc2799 TH |
414 | return -EEXIST; |
415 | ||
fb6896da TH |
416 | sd->s_parent = sysfs_get(acxt->parent_sd); |
417 | ||
41fc1c27 | 418 | sysfs_link_sibling(sd); |
23dc2799 | 419 | |
6b0bfe93 EB |
420 | /* Update timestamps on the parent */ |
421 | ps_iattr = acxt->parent_sd->s_iattr; | |
422 | if (ps_iattr) { | |
423 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; | |
424 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; | |
425 | } | |
426 | ||
23dc2799 | 427 | return 0; |
fb6896da TH |
428 | } |
429 | ||
425cb029 AC |
430 | /** |
431 | * sysfs_pathname - return full path to sysfs dirent | |
432 | * @sd: sysfs_dirent whose path we want | |
433 | * @path: caller allocated buffer | |
434 | * | |
435 | * Gives the name "/" to the sysfs_root entry; any path returned | |
436 | * is relative to wherever sysfs is mounted. | |
437 | * | |
438 | * XXX: does no error checking on @path size | |
439 | */ | |
440 | static char *sysfs_pathname(struct sysfs_dirent *sd, char *path) | |
441 | { | |
442 | if (sd->s_parent) { | |
443 | sysfs_pathname(sd->s_parent, path); | |
444 | strcat(path, "/"); | |
445 | } | |
446 | strcat(path, sd->s_name); | |
447 | return path; | |
448 | } | |
449 | ||
36ce6dad CH |
450 | /** |
451 | * sysfs_add_one - add sysfs_dirent to parent | |
452 | * @acxt: addrm context to use | |
453 | * @sd: sysfs_dirent to be added | |
454 | * | |
455 | * Get @acxt->parent_sd and set sd->s_parent to it and increment | |
456 | * nlink of parent inode if @sd is a directory and link into the | |
457 | * children list of the parent. | |
458 | * | |
459 | * This function should be called between calls to | |
460 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be | |
461 | * passed the same @acxt as passed to sysfs_addrm_start(). | |
462 | * | |
463 | * LOCKING: | |
464 | * Determined by sysfs_addrm_start(). | |
465 | * | |
466 | * RETURNS: | |
467 | * 0 on success, -EEXIST if entry with the given name already | |
468 | * exists. | |
469 | */ | |
470 | int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) | |
471 | { | |
472 | int ret; | |
473 | ||
474 | ret = __sysfs_add_one(acxt, sd); | |
425cb029 AC |
475 | if (ret == -EEXIST) { |
476 | char *path = kzalloc(PATH_MAX, GFP_KERNEL); | |
477 | WARN(1, KERN_WARNING | |
478 | "sysfs: cannot create duplicate filename '%s'\n", | |
479 | (path == NULL) ? sd->s_name : | |
480 | strcat(strcat(sysfs_pathname(acxt->parent_sd, path), "/"), | |
481 | sd->s_name)); | |
482 | kfree(path); | |
483 | } | |
484 | ||
36ce6dad CH |
485 | return ret; |
486 | } | |
487 | ||
fb6896da TH |
488 | /** |
489 | * sysfs_remove_one - remove sysfs_dirent from parent | |
490 | * @acxt: addrm context to use | |
9fd5b1c9 | 491 | * @sd: sysfs_dirent to be removed |
fb6896da TH |
492 | * |
493 | * Mark @sd removed and drop nlink of parent inode if @sd is a | |
181b2e4b | 494 | * directory. @sd is unlinked from the children list. |
fb6896da TH |
495 | * |
496 | * This function should be called between calls to | |
497 | * sysfs_addrm_start() and sysfs_addrm_finish() and should be | |
498 | * passed the same @acxt as passed to sysfs_addrm_start(). | |
499 | * | |
500 | * LOCKING: | |
501 | * Determined by sysfs_addrm_start(). | |
502 | */ | |
503 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd) | |
504 | { | |
6b0bfe93 EB |
505 | struct sysfs_inode_attrs *ps_iattr; |
506 | ||
41fc1c27 TH |
507 | BUG_ON(sd->s_flags & SYSFS_FLAG_REMOVED); |
508 | ||
509 | sysfs_unlink_sibling(sd); | |
fb6896da | 510 | |
6b0bfe93 EB |
511 | /* Update timestamps on the parent */ |
512 | ps_iattr = acxt->parent_sd->s_iattr; | |
513 | if (ps_iattr) { | |
514 | struct iattr *ps_iattrs = &ps_iattr->ia_iattr; | |
515 | ps_iattrs->ia_ctime = ps_iattrs->ia_mtime = CURRENT_TIME; | |
516 | } | |
517 | ||
fb6896da | 518 | sd->s_flags |= SYSFS_FLAG_REMOVED; |
58f2a4c7 | 519 | sd->u.removed_list = acxt->removed; |
fb6896da | 520 | acxt->removed = sd; |
a0edd7c8 TH |
521 | } |
522 | ||
fb6896da TH |
523 | /** |
524 | * sysfs_addrm_finish - finish up sysfs_dirent add/remove | |
525 | * @acxt: addrm context to finish up | |
526 | * | |
527 | * Finish up sysfs_dirent add/remove. Resources acquired by | |
528 | * sysfs_addrm_start() are released and removed sysfs_dirents are | |
a16bbc34 | 529 | * cleaned up. |
fb6896da TH |
530 | * |
531 | * LOCKING: | |
a16bbc34 | 532 | * sysfs_mutex is released. |
fb6896da | 533 | */ |
990e53f8 | 534 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt) |
fb6896da TH |
535 | { |
536 | /* release resources acquired by sysfs_addrm_start() */ | |
537 | mutex_unlock(&sysfs_mutex); | |
fb6896da TH |
538 | |
539 | /* kill removed sysfs_dirents */ | |
540 | while (acxt->removed) { | |
541 | struct sysfs_dirent *sd = acxt->removed; | |
542 | ||
58f2a4c7 | 543 | acxt->removed = sd->u.removed_list; |
fb6896da | 544 | |
fb6896da | 545 | sysfs_deactivate(sd); |
e0edd3c6 | 546 | unmap_bin_file(sd); |
fb6896da | 547 | sysfs_put(sd); |
13b3086d | 548 | } |
b592fcfe EB |
549 | } |
550 | ||
f0b0af47 TH |
551 | /** |
552 | * sysfs_find_dirent - find sysfs_dirent with the given name | |
553 | * @parent_sd: sysfs_dirent to search under | |
554 | * @name: name to look for | |
555 | * | |
556 | * Look for sysfs_dirent with name @name under @parent_sd. | |
c516865c | 557 | * |
f0b0af47 | 558 | * LOCKING: |
3007e997 | 559 | * mutex_lock(sysfs_mutex) |
c516865c | 560 | * |
f0b0af47 TH |
561 | * RETURNS: |
562 | * Pointer to sysfs_dirent if found, NULL if not. | |
c516865c | 563 | */ |
f0b0af47 | 564 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
3ff195b0 | 565 | const void *ns, |
f0b0af47 | 566 | const unsigned char *name) |
c516865c | 567 | { |
4f72c0ca MP |
568 | struct rb_node *p = parent_sd->s_dir.name_tree.rb_node; |
569 | struct sysfs_dirent *found = NULL; | |
570 | ||
903e21e2 EB |
571 | if (!!sysfs_ns_type(parent_sd) != !!ns) { |
572 | WARN(1, KERN_WARNING "sysfs: ns %s in '%s' for '%s'\n", | |
573 | sysfs_ns_type(parent_sd)? "required": "invalid", | |
574 | parent_sd->s_name, name); | |
575 | return NULL; | |
576 | } | |
577 | ||
4f72c0ca MP |
578 | while (p) { |
579 | int c; | |
580 | #define node rb_entry(p, struct sysfs_dirent, name_node) | |
581 | c = strcmp(name, node->s_name); | |
582 | if (c < 0) { | |
583 | p = node->name_node.rb_left; | |
584 | } else if (c > 0) { | |
585 | p = node->name_node.rb_right; | |
586 | } else { | |
587 | found = node; | |
588 | p = node->name_node.rb_left; | |
589 | } | |
590 | #undef node | |
591 | } | |
f0b0af47 | 592 | |
b9e2780d EB |
593 | if (found) { |
594 | while (found->s_ns != ns) { | |
4f72c0ca MP |
595 | p = rb_next(&found->name_node); |
596 | if (!p) | |
597 | return NULL; | |
598 | found = rb_entry(p, struct sysfs_dirent, name_node); | |
599 | if (strcmp(name, found->s_name)) | |
600 | return NULL; | |
601 | } | |
3ff195b0 | 602 | } |
4f72c0ca MP |
603 | |
604 | return found; | |
f0b0af47 | 605 | } |
c516865c | 606 | |
f0b0af47 TH |
607 | /** |
608 | * sysfs_get_dirent - find and get sysfs_dirent with the given name | |
609 | * @parent_sd: sysfs_dirent to search under | |
610 | * @name: name to look for | |
611 | * | |
612 | * Look for sysfs_dirent with name @name under @parent_sd and get | |
613 | * it if found. | |
614 | * | |
615 | * LOCKING: | |
3007e997 | 616 | * Kernel thread context (may sleep). Grabs sysfs_mutex. |
f0b0af47 TH |
617 | * |
618 | * RETURNS: | |
619 | * Pointer to sysfs_dirent if found, NULL if not. | |
620 | */ | |
621 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, | |
3ff195b0 | 622 | const void *ns, |
f0b0af47 TH |
623 | const unsigned char *name) |
624 | { | |
625 | struct sysfs_dirent *sd; | |
626 | ||
3007e997 | 627 | mutex_lock(&sysfs_mutex); |
3ff195b0 | 628 | sd = sysfs_find_dirent(parent_sd, ns, name); |
f0b0af47 | 629 | sysfs_get(sd); |
3007e997 | 630 | mutex_unlock(&sysfs_mutex); |
f0b0af47 TH |
631 | |
632 | return sd; | |
c516865c | 633 | } |
f1282c84 | 634 | EXPORT_SYMBOL_GPL(sysfs_get_dirent); |
c516865c | 635 | |
608e266a | 636 | static int create_dir(struct kobject *kobj, struct sysfs_dirent *parent_sd, |
3ff195b0 EB |
637 | enum kobj_ns_type type, const void *ns, const char *name, |
638 | struct sysfs_dirent **p_sd) | |
1da177e4 | 639 | { |
1da177e4 | 640 | umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO; |
51225039 | 641 | struct sysfs_addrm_cxt acxt; |
dfeb9fb0 | 642 | struct sysfs_dirent *sd; |
23dc2799 | 643 | int rc; |
1da177e4 | 644 | |
fc9f54b9 | 645 | /* allocate */ |
3e519038 | 646 | sd = sysfs_new_dirent(name, mode, SYSFS_DIR); |
a26cd722 | 647 | if (!sd) |
51225039 | 648 | return -ENOMEM; |
3ff195b0 EB |
649 | |
650 | sd->s_flags |= (type << SYSFS_NS_TYPE_SHIFT); | |
651 | sd->s_ns = ns; | |
b1fc3d61 | 652 | sd->s_dir.kobj = kobj; |
dfeb9fb0 | 653 | |
fc9f54b9 | 654 | /* link in */ |
51225039 | 655 | sysfs_addrm_start(&acxt, parent_sd); |
23dc2799 TH |
656 | rc = sysfs_add_one(&acxt, sd); |
657 | sysfs_addrm_finish(&acxt); | |
967e35dc | 658 | |
23dc2799 TH |
659 | if (rc == 0) |
660 | *p_sd = sd; | |
661 | else | |
967e35dc | 662 | sysfs_put(sd); |
dfeb9fb0 | 663 | |
23dc2799 | 664 | return rc; |
1da177e4 LT |
665 | } |
666 | ||
608e266a TH |
667 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
668 | struct sysfs_dirent **p_sd) | |
1da177e4 | 669 | { |
3ff195b0 EB |
670 | return create_dir(kobj, kobj->sd, |
671 | KOBJ_NS_TYPE_NONE, NULL, name, p_sd); | |
672 | } | |
673 | ||
be867b19 SH |
674 | /** |
675 | * sysfs_read_ns_type: return associated ns_type | |
676 | * @kobj: the kobject being queried | |
677 | * | |
678 | * Each kobject can be tagged with exactly one namespace type | |
679 | * (i.e. network or user). Return the ns_type associated with | |
680 | * this object if any | |
681 | */ | |
3ff195b0 EB |
682 | static enum kobj_ns_type sysfs_read_ns_type(struct kobject *kobj) |
683 | { | |
684 | const struct kobj_ns_type_operations *ops; | |
685 | enum kobj_ns_type type; | |
686 | ||
687 | ops = kobj_child_ns_ops(kobj); | |
688 | if (!ops) | |
689 | return KOBJ_NS_TYPE_NONE; | |
690 | ||
691 | type = ops->type; | |
692 | BUG_ON(type <= KOBJ_NS_TYPE_NONE); | |
693 | BUG_ON(type >= KOBJ_NS_TYPES); | |
694 | BUG_ON(!kobj_ns_type_registered(type)); | |
695 | ||
696 | return type; | |
1da177e4 LT |
697 | } |
698 | ||
699 | /** | |
700 | * sysfs_create_dir - create a directory for an object. | |
1da177e4 LT |
701 | * @kobj: object we're creating directory for. |
702 | */ | |
90bc6135 | 703 | int sysfs_create_dir(struct kobject * kobj) |
1da177e4 | 704 | { |
3ff195b0 | 705 | enum kobj_ns_type type; |
608e266a | 706 | struct sysfs_dirent *parent_sd, *sd; |
3ff195b0 | 707 | const void *ns = NULL; |
1da177e4 LT |
708 | int error = 0; |
709 | ||
710 | BUG_ON(!kobj); | |
711 | ||
90bc6135 | 712 | if (kobj->parent) |
608e266a | 713 | parent_sd = kobj->parent->sd; |
1da177e4 | 714 | else |
7d0c7d67 | 715 | parent_sd = &sysfs_root; |
1da177e4 | 716 | |
3ff195b0 EB |
717 | if (sysfs_ns_type(parent_sd)) |
718 | ns = kobj->ktype->namespace(kobj); | |
719 | type = sysfs_read_ns_type(kobj); | |
720 | ||
721 | error = create_dir(kobj, parent_sd, type, ns, kobject_name(kobj), &sd); | |
1da177e4 | 722 | if (!error) |
608e266a | 723 | kobj->sd = sd; |
1da177e4 LT |
724 | return error; |
725 | } | |
726 | ||
1da177e4 LT |
727 | static struct dentry * sysfs_lookup(struct inode *dir, struct dentry *dentry, |
728 | struct nameidata *nd) | |
729 | { | |
6cb52147 | 730 | struct dentry *ret = NULL; |
3ff195b0 EB |
731 | struct dentry *parent = dentry->d_parent; |
732 | struct sysfs_dirent *parent_sd = parent->d_fsdata; | |
a7a04754 | 733 | struct sysfs_dirent *sd; |
fc9f54b9 | 734 | struct inode *inode; |
3ff195b0 EB |
735 | enum kobj_ns_type type; |
736 | const void *ns; | |
1da177e4 | 737 | |
6cb52147 TH |
738 | mutex_lock(&sysfs_mutex); |
739 | ||
3ff195b0 EB |
740 | type = sysfs_ns_type(parent_sd); |
741 | ns = sysfs_info(dir->i_sb)->ns[type]; | |
742 | ||
743 | sd = sysfs_find_dirent(parent_sd, ns, dentry->d_name.name); | |
1da177e4 | 744 | |
fc9f54b9 | 745 | /* no such entry */ |
e49452c6 TH |
746 | if (!sd) { |
747 | ret = ERR_PTR(-ENOENT); | |
6cb52147 | 748 | goto out_unlock; |
e49452c6 | 749 | } |
fc9f54b9 TH |
750 | |
751 | /* attach dentry and inode */ | |
fac2622b | 752 | inode = sysfs_get_inode(dir->i_sb, sd); |
6cb52147 TH |
753 | if (!inode) { |
754 | ret = ERR_PTR(-ENOMEM); | |
755 | goto out_unlock; | |
756 | } | |
3007e997 | 757 | |
d6b4fd2f | 758 | /* instantiate and hash dentry */ |
832b6af1 EB |
759 | ret = d_find_alias(inode); |
760 | if (!ret) { | |
fb045adb | 761 | d_set_d_op(dentry, &sysfs_dentry_ops); |
832b6af1 EB |
762 | dentry->d_fsdata = sysfs_get(sd); |
763 | d_add(dentry, inode); | |
764 | } else { | |
765 | d_move(ret, dentry); | |
766 | iput(inode); | |
767 | } | |
fc9f54b9 | 768 | |
6cb52147 | 769 | out_unlock: |
3007e997 | 770 | mutex_unlock(&sysfs_mutex); |
6cb52147 | 771 | return ret; |
1da177e4 LT |
772 | } |
773 | ||
c5ef1c42 | 774 | const struct inode_operations sysfs_dir_inode_operations = { |
1da177e4 | 775 | .lookup = sysfs_lookup, |
e61ab4ae | 776 | .permission = sysfs_permission, |
988d186d | 777 | .setattr = sysfs_setattr, |
e61ab4ae | 778 | .getattr = sysfs_getattr, |
ddd29ec6 | 779 | .setxattr = sysfs_setxattr, |
1da177e4 LT |
780 | }; |
781 | ||
608e266a | 782 | static void remove_dir(struct sysfs_dirent *sd) |
1da177e4 | 783 | { |
fb6896da | 784 | struct sysfs_addrm_cxt acxt; |
1da177e4 | 785 | |
fb6896da | 786 | sysfs_addrm_start(&acxt, sd->s_parent); |
fb6896da TH |
787 | sysfs_remove_one(&acxt, sd); |
788 | sysfs_addrm_finish(&acxt); | |
1da177e4 LT |
789 | } |
790 | ||
608e266a | 791 | void sysfs_remove_subdir(struct sysfs_dirent *sd) |
1da177e4 | 792 | { |
608e266a | 793 | remove_dir(sd); |
1da177e4 LT |
794 | } |
795 | ||
796 | ||
608e266a | 797 | static void __sysfs_remove_dir(struct sysfs_dirent *dir_sd) |
1da177e4 | 798 | { |
fb6896da | 799 | struct sysfs_addrm_cxt acxt; |
a406f758 | 800 | struct rb_node *pos; |
1da177e4 | 801 | |
608e266a | 802 | if (!dir_sd) |
1da177e4 LT |
803 | return; |
804 | ||
608e266a | 805 | pr_debug("sysfs %s: removing dir\n", dir_sd->s_name); |
fb6896da | 806 | sysfs_addrm_start(&acxt, dir_sd); |
a406f758 MP |
807 | pos = rb_first(&dir_sd->s_dir.inode_tree); |
808 | while (pos) { | |
809 | struct sysfs_dirent *sd = rb_entry(pos, struct sysfs_dirent, inode_node); | |
810 | pos = rb_next(pos); | |
3efa65b9 | 811 | if (sysfs_type(sd) != SYSFS_DIR) |
fb6896da | 812 | sysfs_remove_one(&acxt, sd); |
1da177e4 | 813 | } |
fb6896da | 814 | sysfs_addrm_finish(&acxt); |
0ab66088 | 815 | |
608e266a | 816 | remove_dir(dir_sd); |
b592fcfe EB |
817 | } |
818 | ||
819 | /** | |
820 | * sysfs_remove_dir - remove an object's directory. | |
821 | * @kobj: object. | |
822 | * | |
823 | * The only thing special about this is that we remove any files in | |
824 | * the directory before we remove the directory, and we've inlined | |
825 | * what used to be sysfs_rmdir() below, instead of calling separately. | |
826 | */ | |
827 | ||
828 | void sysfs_remove_dir(struct kobject * kobj) | |
829 | { | |
608e266a | 830 | struct sysfs_dirent *sd = kobj->sd; |
aecdceda | 831 | |
5f995323 | 832 | spin_lock(&sysfs_assoc_lock); |
608e266a | 833 | kobj->sd = NULL; |
5f995323 | 834 | spin_unlock(&sysfs_assoc_lock); |
aecdceda | 835 | |
608e266a | 836 | __sysfs_remove_dir(sd); |
1da177e4 LT |
837 | } |
838 | ||
ca1bab38 | 839 | int sysfs_rename(struct sysfs_dirent *sd, |
3ff195b0 EB |
840 | struct sysfs_dirent *new_parent_sd, const void *new_ns, |
841 | const char *new_name) | |
1da177e4 | 842 | { |
51225039 | 843 | const char *dup_name = NULL; |
996b7376 | 844 | int error; |
1da177e4 | 845 | |
832b6af1 | 846 | mutex_lock(&sysfs_mutex); |
932ea2e3 | 847 | |
9918f9a4 | 848 | error = 0; |
3ff195b0 | 849 | if ((sd->s_parent == new_parent_sd) && (sd->s_ns == new_ns) && |
ca1bab38 | 850 | (strcmp(sd->s_name, new_name) == 0)) |
9918f9a4 EB |
851 | goto out; /* nothing to rename */ |
852 | ||
9918f9a4 | 853 | error = -EEXIST; |
3ff195b0 | 854 | if (sysfs_find_dirent(new_parent_sd, new_ns, new_name)) |
832b6af1 | 855 | goto out; |
996b7376 | 856 | |
0b4a4fea | 857 | /* rename sysfs_dirent */ |
ca1bab38 EB |
858 | if (strcmp(sd->s_name, new_name) != 0) { |
859 | error = -ENOMEM; | |
860 | new_name = dup_name = kstrdup(new_name, GFP_KERNEL); | |
861 | if (!new_name) | |
862 | goto out; | |
863 | ||
864 | dup_name = sd->s_name; | |
865 | sd->s_name = new_name; | |
866 | } | |
0c096b50 | 867 | |
f6d90b4f EB |
868 | /* Move to the appropriate place in the appropriate directories rbtree. */ |
869 | sysfs_unlink_sibling(sd); | |
870 | sysfs_get(new_parent_sd); | |
871 | sysfs_put(sd->s_parent); | |
3ff195b0 | 872 | sd->s_ns = new_ns; |
f6d90b4f EB |
873 | sd->s_parent = new_parent_sd; |
874 | sysfs_link_sibling(sd); | |
0c096b50 | 875 | |
996b7376 | 876 | error = 0; |
832b6af1 | 877 | out: |
9918f9a4 | 878 | mutex_unlock(&sysfs_mutex); |
51225039 | 879 | kfree(dup_name); |
1da177e4 LT |
880 | return error; |
881 | } | |
882 | ||
ca1bab38 EB |
883 | int sysfs_rename_dir(struct kobject *kobj, const char *new_name) |
884 | { | |
3ff195b0 EB |
885 | struct sysfs_dirent *parent_sd = kobj->sd->s_parent; |
886 | const void *new_ns = NULL; | |
887 | ||
888 | if (sysfs_ns_type(parent_sd)) | |
889 | new_ns = kobj->ktype->namespace(kobj); | |
890 | ||
891 | return sysfs_rename(kobj->sd, parent_sd, new_ns, new_name); | |
ca1bab38 EB |
892 | } |
893 | ||
51225039 | 894 | int sysfs_move_dir(struct kobject *kobj, struct kobject *new_parent_kobj) |
8a82472f | 895 | { |
51225039 TH |
896 | struct sysfs_dirent *sd = kobj->sd; |
897 | struct sysfs_dirent *new_parent_sd; | |
3ff195b0 | 898 | const void *new_ns = NULL; |
8a82472f | 899 | |
51225039 | 900 | BUG_ON(!sd->s_parent); |
3ff195b0 EB |
901 | if (sysfs_ns_type(sd->s_parent)) |
902 | new_ns = kobj->ktype->namespace(kobj); | |
ca1bab38 | 903 | new_parent_sd = new_parent_kobj && new_parent_kobj->sd ? |
a6a83577 | 904 | new_parent_kobj->sd : &sysfs_root; |
51225039 | 905 | |
3ff195b0 | 906 | return sysfs_rename(sd, new_parent_sd, new_ns, sd->s_name); |
8a82472f CH |
907 | } |
908 | ||
1da177e4 LT |
909 | /* Relationship between s_mode and the DT_xxx types */ |
910 | static inline unsigned char dt_type(struct sysfs_dirent *sd) | |
911 | { | |
912 | return (sd->s_mode >> 12) & 15; | |
913 | } | |
914 | ||
1e5289c9 EB |
915 | static int sysfs_dir_release(struct inode *inode, struct file *filp) |
916 | { | |
917 | sysfs_put(filp->private_data); | |
918 | return 0; | |
919 | } | |
920 | ||
3ff195b0 EB |
921 | static struct sysfs_dirent *sysfs_dir_pos(const void *ns, |
922 | struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) | |
1e5289c9 EB |
923 | { |
924 | if (pos) { | |
925 | int valid = !(pos->s_flags & SYSFS_FLAG_REMOVED) && | |
926 | pos->s_parent == parent_sd && | |
927 | ino == pos->s_ino; | |
928 | sysfs_put(pos); | |
3ff195b0 EB |
929 | if (!valid) |
930 | pos = NULL; | |
1e5289c9 | 931 | } |
3ff195b0 | 932 | if (!pos && (ino > 1) && (ino < INT_MAX)) { |
a406f758 MP |
933 | struct rb_node *p = parent_sd->s_dir.inode_tree.rb_node; |
934 | while (p) { | |
935 | #define node rb_entry(p, struct sysfs_dirent, inode_node) | |
936 | if (ino < node->s_ino) { | |
937 | pos = node; | |
938 | p = node->inode_node.rb_left; | |
939 | } else if (ino > node->s_ino) { | |
940 | p = node->inode_node.rb_right; | |
941 | } else { | |
942 | pos = node; | |
943 | break; | |
944 | } | |
945 | #undef node | |
946 | } | |
947 | } | |
b9e2780d | 948 | while (pos && pos->s_ns != ns) { |
a406f758 MP |
949 | struct rb_node *p = rb_next(&pos->inode_node); |
950 | if (!p) | |
951 | pos = NULL; | |
952 | else | |
953 | pos = rb_entry(p, struct sysfs_dirent, inode_node); | |
1e5289c9 EB |
954 | } |
955 | return pos; | |
956 | } | |
957 | ||
3ff195b0 EB |
958 | static struct sysfs_dirent *sysfs_dir_next_pos(const void *ns, |
959 | struct sysfs_dirent *parent_sd, ino_t ino, struct sysfs_dirent *pos) | |
1e5289c9 | 960 | { |
3ff195b0 | 961 | pos = sysfs_dir_pos(ns, parent_sd, ino, pos); |
a406f758 MP |
962 | if (pos) do { |
963 | struct rb_node *p = rb_next(&pos->inode_node); | |
964 | if (!p) | |
965 | pos = NULL; | |
966 | else | |
967 | pos = rb_entry(p, struct sysfs_dirent, inode_node); | |
b9e2780d | 968 | } while (pos && pos->s_ns != ns); |
1e5289c9 EB |
969 | return pos; |
970 | } | |
971 | ||
1da177e4 LT |
972 | static int sysfs_readdir(struct file * filp, void * dirent, filldir_t filldir) |
973 | { | |
f427f5d5 | 974 | struct dentry *dentry = filp->f_path.dentry; |
1da177e4 | 975 | struct sysfs_dirent * parent_sd = dentry->d_fsdata; |
1e5289c9 | 976 | struct sysfs_dirent *pos = filp->private_data; |
3ff195b0 EB |
977 | enum kobj_ns_type type; |
978 | const void *ns; | |
1da177e4 | 979 | ino_t ino; |
1da177e4 | 980 | |
3ff195b0 EB |
981 | type = sysfs_ns_type(parent_sd); |
982 | ns = sysfs_info(dentry->d_sb)->ns[type]; | |
983 | ||
3efa65b9 EB |
984 | if (filp->f_pos == 0) { |
985 | ino = parent_sd->s_ino; | |
986 | if (filldir(dirent, ".", 1, filp->f_pos, ino, DT_DIR) == 0) | |
1da177e4 | 987 | filp->f_pos++; |
3efa65b9 EB |
988 | } |
989 | if (filp->f_pos == 1) { | |
990 | if (parent_sd->s_parent) | |
991 | ino = parent_sd->s_parent->s_ino; | |
992 | else | |
993 | ino = parent_sd->s_ino; | |
994 | if (filldir(dirent, "..", 2, filp->f_pos, ino, DT_DIR) == 0) | |
1da177e4 | 995 | filp->f_pos++; |
3efa65b9 | 996 | } |
1e5289c9 | 997 | mutex_lock(&sysfs_mutex); |
3ff195b0 | 998 | for (pos = sysfs_dir_pos(ns, parent_sd, filp->f_pos, pos); |
1e5289c9 | 999 | pos; |
3ff195b0 | 1000 | pos = sysfs_dir_next_pos(ns, parent_sd, filp->f_pos, pos)) { |
1e5289c9 EB |
1001 | const char * name; |
1002 | unsigned int type; | |
1003 | int len, ret; | |
1004 | ||
1005 | name = pos->s_name; | |
1006 | len = strlen(name); | |
1007 | ino = pos->s_ino; | |
1008 | type = dt_type(pos); | |
1009 | filp->f_pos = ino; | |
1010 | filp->private_data = sysfs_get(pos); | |
1da177e4 | 1011 | |
3007e997 | 1012 | mutex_unlock(&sysfs_mutex); |
1e5289c9 EB |
1013 | ret = filldir(dirent, name, len, filp->f_pos, ino, type); |
1014 | mutex_lock(&sysfs_mutex); | |
1015 | if (ret < 0) | |
1016 | break; | |
1017 | } | |
1018 | mutex_unlock(&sysfs_mutex); | |
1019 | if ((filp->f_pos > 1) && !pos) { /* EOF */ | |
1020 | filp->f_pos = INT_MAX; | |
1021 | filp->private_data = NULL; | |
1da177e4 | 1022 | } |
3efa65b9 | 1023 | return 0; |
1da177e4 LT |
1024 | } |
1025 | ||
3efa65b9 | 1026 | |
4b6f5d20 | 1027 | const struct file_operations sysfs_dir_operations = { |
1da177e4 LT |
1028 | .read = generic_read_dir, |
1029 | .readdir = sysfs_readdir, | |
1e5289c9 | 1030 | .release = sysfs_dir_release, |
3222a3e5 | 1031 | .llseek = generic_file_llseek, |
1da177e4 | 1032 | }; |