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Commit | Line | Data |
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b8441ed2 TH |
1 | /* |
2 | * kernfs.h - pseudo filesystem decoupled from vfs locking | |
3 | * | |
4 | * This file is released under the GPLv2. | |
5 | */ | |
6 | ||
7 | #ifndef __LINUX_KERNFS_H | |
8 | #define __LINUX_KERNFS_H | |
9 | ||
879f40d1 | 10 | #include <linux/kernel.h> |
5d0e26bb | 11 | #include <linux/err.h> |
dd8a5b03 TH |
12 | #include <linux/list.h> |
13 | #include <linux/mutex.h> | |
bc755553 | 14 | #include <linux/idr.h> |
517e64f5 | 15 | #include <linux/lockdep.h> |
cf9e5a73 TH |
16 | #include <linux/rbtree.h> |
17 | #include <linux/atomic.h> | |
abd54f02 | 18 | #include <linux/wait.h> |
879f40d1 | 19 | |
5d60418e | 20 | struct file; |
917f56ca | 21 | struct dentry; |
5d60418e | 22 | struct iattr; |
dd8a5b03 TH |
23 | struct seq_file; |
24 | struct vm_area_struct; | |
4b93dc9b TH |
25 | struct super_block; |
26 | struct file_system_type; | |
5d60418e | 27 | |
c525aadd TH |
28 | struct kernfs_open_node; |
29 | struct kernfs_iattrs; | |
cf9e5a73 TH |
30 | |
31 | enum kernfs_node_type { | |
df23fc39 TH |
32 | KERNFS_DIR = 0x0001, |
33 | KERNFS_FILE = 0x0002, | |
34 | KERNFS_LINK = 0x0004, | |
cf9e5a73 TH |
35 | }; |
36 | ||
df23fc39 | 37 | #define KERNFS_TYPE_MASK 0x000f |
df23fc39 | 38 | #define KERNFS_FLAG_MASK ~KERNFS_TYPE_MASK |
cf9e5a73 TH |
39 | |
40 | enum kernfs_node_flag { | |
d35258ef | 41 | KERNFS_ACTIVATED = 0x0010, |
df23fc39 TH |
42 | KERNFS_NS = 0x0020, |
43 | KERNFS_HAS_SEQ_SHOW = 0x0040, | |
44 | KERNFS_HAS_MMAP = 0x0080, | |
45 | KERNFS_LOCKDEP = 0x0100, | |
6b0afc2a TH |
46 | KERNFS_SUICIDAL = 0x0400, |
47 | KERNFS_SUICIDED = 0x0800, | |
ea015218 | 48 | KERNFS_EMPTY_DIR = 0x1000, |
cf9e5a73 TH |
49 | }; |
50 | ||
d35258ef TH |
51 | /* @flags for kernfs_create_root() */ |
52 | enum kernfs_root_flag { | |
555724a8 TH |
53 | /* |
54 | * kernfs_nodes are created in the deactivated state and invisible. | |
55 | * They require explicit kernfs_activate() to become visible. This | |
56 | * can be used to make related nodes become visible atomically | |
57 | * after all nodes are created successfully. | |
58 | */ | |
59 | KERNFS_ROOT_CREATE_DEACTIVATED = 0x0001, | |
60 | ||
61 | /* | |
62 | * For regular flies, if the opener has CAP_DAC_OVERRIDE, open(2) | |
63 | * succeeds regardless of the RW permissions. sysfs had an extra | |
64 | * layer of enforcement where open(2) fails with -EACCES regardless | |
65 | * of CAP_DAC_OVERRIDE if the permission doesn't have the | |
66 | * respective read or write access at all (none of S_IRUGO or | |
67 | * S_IWUGO) or the respective operation isn't implemented. The | |
68 | * following flag enables that behavior. | |
69 | */ | |
70 | KERNFS_ROOT_EXTRA_OPEN_PERM_CHECK = 0x0002, | |
d35258ef TH |
71 | }; |
72 | ||
324a56e1 TH |
73 | /* type-specific structures for kernfs_node union members */ |
74 | struct kernfs_elem_dir { | |
cf9e5a73 | 75 | unsigned long subdirs; |
adc5e8b5 | 76 | /* children rbtree starts here and goes through kn->rb */ |
cf9e5a73 TH |
77 | struct rb_root children; |
78 | ||
79 | /* | |
80 | * The kernfs hierarchy this directory belongs to. This fits | |
324a56e1 | 81 | * better directly in kernfs_node but is here to save space. |
cf9e5a73 TH |
82 | */ |
83 | struct kernfs_root *root; | |
84 | }; | |
85 | ||
324a56e1 TH |
86 | struct kernfs_elem_symlink { |
87 | struct kernfs_node *target_kn; | |
cf9e5a73 TH |
88 | }; |
89 | ||
324a56e1 | 90 | struct kernfs_elem_attr { |
cf9e5a73 | 91 | const struct kernfs_ops *ops; |
c525aadd | 92 | struct kernfs_open_node *open; |
cf9e5a73 | 93 | loff_t size; |
ecca47ce | 94 | struct kernfs_node *notify_next; /* for kernfs_notify() */ |
cf9e5a73 TH |
95 | }; |
96 | ||
97 | /* | |
324a56e1 TH |
98 | * kernfs_node - the building block of kernfs hierarchy. Each and every |
99 | * kernfs node is represented by single kernfs_node. Most fields are | |
cf9e5a73 TH |
100 | * private to kernfs and shouldn't be accessed directly by kernfs users. |
101 | * | |
324a56e1 TH |
102 | * As long as s_count reference is held, the kernfs_node itself is |
103 | * accessible. Dereferencing elem or any other outer entity requires | |
104 | * active reference. | |
cf9e5a73 | 105 | */ |
324a56e1 | 106 | struct kernfs_node { |
adc5e8b5 TH |
107 | atomic_t count; |
108 | atomic_t active; | |
cf9e5a73 TH |
109 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
110 | struct lockdep_map dep_map; | |
111 | #endif | |
3eef34ad TH |
112 | /* |
113 | * Use kernfs_get_parent() and kernfs_name/path() instead of | |
114 | * accessing the following two fields directly. If the node is | |
115 | * never moved to a different parent, it is safe to access the | |
116 | * parent directly. | |
117 | */ | |
adc5e8b5 TH |
118 | struct kernfs_node *parent; |
119 | const char *name; | |
cf9e5a73 | 120 | |
adc5e8b5 | 121 | struct rb_node rb; |
cf9e5a73 | 122 | |
adc5e8b5 | 123 | const void *ns; /* namespace tag */ |
9b0925a6 | 124 | unsigned int hash; /* ns + name hash */ |
cf9e5a73 | 125 | union { |
adc5e8b5 TH |
126 | struct kernfs_elem_dir dir; |
127 | struct kernfs_elem_symlink symlink; | |
128 | struct kernfs_elem_attr attr; | |
cf9e5a73 TH |
129 | }; |
130 | ||
131 | void *priv; | |
132 | ||
adc5e8b5 TH |
133 | unsigned short flags; |
134 | umode_t mode; | |
135 | unsigned int ino; | |
c525aadd | 136 | struct kernfs_iattrs *iattr; |
cf9e5a73 | 137 | }; |
b8441ed2 | 138 | |
80b9bbef | 139 | /* |
90c07c89 TH |
140 | * kernfs_syscall_ops may be specified on kernfs_create_root() to support |
141 | * syscalls. These optional callbacks are invoked on the matching syscalls | |
142 | * and can perform any kernfs operations which don't necessarily have to be | |
143 | * the exact operation requested. An active reference is held for each | |
144 | * kernfs_node parameter. | |
80b9bbef | 145 | */ |
90c07c89 | 146 | struct kernfs_syscall_ops { |
6a7fed4e TH |
147 | int (*remount_fs)(struct kernfs_root *root, int *flags, char *data); |
148 | int (*show_options)(struct seq_file *sf, struct kernfs_root *root); | |
149 | ||
80b9bbef TH |
150 | int (*mkdir)(struct kernfs_node *parent, const char *name, |
151 | umode_t mode); | |
152 | int (*rmdir)(struct kernfs_node *kn); | |
153 | int (*rename)(struct kernfs_node *kn, struct kernfs_node *new_parent, | |
154 | const char *new_name); | |
4f41fc59 SH |
155 | int (*show_path)(struct seq_file *sf, struct kernfs_node *kn, |
156 | struct kernfs_root *root); | |
80b9bbef TH |
157 | }; |
158 | ||
ba7443bc TH |
159 | struct kernfs_root { |
160 | /* published fields */ | |
324a56e1 | 161 | struct kernfs_node *kn; |
d35258ef | 162 | unsigned int flags; /* KERNFS_ROOT_* flags */ |
bc755553 TH |
163 | |
164 | /* private fields, do not use outside kernfs proper */ | |
165 | struct ida ino_ida; | |
90c07c89 | 166 | struct kernfs_syscall_ops *syscall_ops; |
7d568a83 TH |
167 | |
168 | /* list of kernfs_super_info of this root, protected by kernfs_mutex */ | |
169 | struct list_head supers; | |
170 | ||
abd54f02 | 171 | wait_queue_head_t deactivate_waitq; |
ba7443bc TH |
172 | }; |
173 | ||
c525aadd | 174 | struct kernfs_open_file { |
dd8a5b03 | 175 | /* published fields */ |
324a56e1 | 176 | struct kernfs_node *kn; |
dd8a5b03 | 177 | struct file *file; |
2536390d | 178 | void *priv; |
dd8a5b03 TH |
179 | |
180 | /* private fields, do not use outside kernfs proper */ | |
181 | struct mutex mutex; | |
e4234a1f | 182 | struct mutex prealloc_mutex; |
dd8a5b03 TH |
183 | int event; |
184 | struct list_head list; | |
2b75869b | 185 | char *prealloc_buf; |
dd8a5b03 | 186 | |
b7ce40cf | 187 | size_t atomic_write_len; |
dd8a5b03 TH |
188 | bool mmapped; |
189 | const struct vm_operations_struct *vm_ops; | |
190 | }; | |
191 | ||
f6acf8bb TH |
192 | struct kernfs_ops { |
193 | /* | |
194 | * Read is handled by either seq_file or raw_read(). | |
195 | * | |
d19b9846 TH |
196 | * If seq_show() is present, seq_file path is active. Other seq |
197 | * operations are optional and if not implemented, the behavior is | |
198 | * equivalent to single_open(). @sf->private points to the | |
c525aadd | 199 | * associated kernfs_open_file. |
f6acf8bb TH |
200 | * |
201 | * read() is bounced through kernel buffer and a read larger than | |
202 | * PAGE_SIZE results in partial operation of PAGE_SIZE. | |
203 | */ | |
204 | int (*seq_show)(struct seq_file *sf, void *v); | |
d19b9846 TH |
205 | |
206 | void *(*seq_start)(struct seq_file *sf, loff_t *ppos); | |
207 | void *(*seq_next)(struct seq_file *sf, void *v, loff_t *ppos); | |
208 | void (*seq_stop)(struct seq_file *sf, void *v); | |
f6acf8bb | 209 | |
c525aadd | 210 | ssize_t (*read)(struct kernfs_open_file *of, char *buf, size_t bytes, |
f6acf8bb TH |
211 | loff_t off); |
212 | ||
213 | /* | |
4d3773c4 TH |
214 | * write() is bounced through kernel buffer. If atomic_write_len |
215 | * is not set, a write larger than PAGE_SIZE results in partial | |
216 | * operations of PAGE_SIZE chunks. If atomic_write_len is set, | |
217 | * writes upto the specified size are executed atomically but | |
218 | * larger ones are rejected with -E2BIG. | |
f6acf8bb | 219 | */ |
4d3773c4 | 220 | size_t atomic_write_len; |
2b75869b N |
221 | /* |
222 | * "prealloc" causes a buffer to be allocated at open for | |
223 | * all read/write requests. As ->seq_show uses seq_read() | |
224 | * which does its own allocation, it is incompatible with | |
225 | * ->prealloc. Provide ->read and ->write with ->prealloc. | |
226 | */ | |
227 | bool prealloc; | |
c525aadd | 228 | ssize_t (*write)(struct kernfs_open_file *of, char *buf, size_t bytes, |
f6acf8bb TH |
229 | loff_t off); |
230 | ||
c525aadd | 231 | int (*mmap)(struct kernfs_open_file *of, struct vm_area_struct *vma); |
517e64f5 TH |
232 | |
233 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
234 | struct lock_class_key lockdep_key; | |
235 | #endif | |
f6acf8bb TH |
236 | }; |
237 | ||
ba341d55 | 238 | #ifdef CONFIG_KERNFS |
879f40d1 | 239 | |
df23fc39 | 240 | static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
cf9e5a73 | 241 | { |
df23fc39 | 242 | return kn->flags & KERNFS_TYPE_MASK; |
cf9e5a73 TH |
243 | } |
244 | ||
245 | /** | |
246 | * kernfs_enable_ns - enable namespace under a directory | |
324a56e1 | 247 | * @kn: directory of interest, should be empty |
cf9e5a73 | 248 | * |
324a56e1 TH |
249 | * This is to be called right after @kn is created to enable namespace |
250 | * under it. All children of @kn must have non-NULL namespace tags and | |
cf9e5a73 TH |
251 | * only the ones which match the super_block's tag will be visible. |
252 | */ | |
324a56e1 | 253 | static inline void kernfs_enable_ns(struct kernfs_node *kn) |
cf9e5a73 | 254 | { |
df23fc39 | 255 | WARN_ON_ONCE(kernfs_type(kn) != KERNFS_DIR); |
adc5e8b5 | 256 | WARN_ON_ONCE(!RB_EMPTY_ROOT(&kn->dir.children)); |
df23fc39 | 257 | kn->flags |= KERNFS_NS; |
cf9e5a73 TH |
258 | } |
259 | ||
ac9bba03 TH |
260 | /** |
261 | * kernfs_ns_enabled - test whether namespace is enabled | |
324a56e1 | 262 | * @kn: the node to test |
ac9bba03 TH |
263 | * |
264 | * Test whether namespace filtering is enabled for the children of @ns. | |
265 | */ | |
324a56e1 | 266 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
ac9bba03 | 267 | { |
df23fc39 | 268 | return kn->flags & KERNFS_NS; |
ac9bba03 TH |
269 | } |
270 | ||
3eef34ad | 271 | int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen); |
9acee9c5 | 272 | size_t kernfs_path_len(struct kernfs_node *kn); |
9f6df573 AK |
273 | int kernfs_path_from_node(struct kernfs_node *root_kn, struct kernfs_node *kn, |
274 | char *buf, size_t buflen); | |
275 | char *kernfs_path(struct kernfs_node *kn, char *buf, size_t buflen); | |
3eef34ad TH |
276 | void pr_cont_kernfs_name(struct kernfs_node *kn); |
277 | void pr_cont_kernfs_path(struct kernfs_node *kn); | |
278 | struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn); | |
324a56e1 TH |
279 | struct kernfs_node *kernfs_find_and_get_ns(struct kernfs_node *parent, |
280 | const char *name, const void *ns); | |
bd96f76a TH |
281 | struct kernfs_node *kernfs_walk_and_get_ns(struct kernfs_node *parent, |
282 | const char *path, const void *ns); | |
324a56e1 TH |
283 | void kernfs_get(struct kernfs_node *kn); |
284 | void kernfs_put(struct kernfs_node *kn); | |
ccf73cf3 | 285 | |
0c23b225 TH |
286 | struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry); |
287 | struct kernfs_root *kernfs_root_from_sb(struct super_block *sb); | |
fb02915f | 288 | struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn); |
0c23b225 | 289 | |
fb3c8315 AK |
290 | struct dentry *kernfs_node_dentry(struct kernfs_node *kn, |
291 | struct super_block *sb); | |
90c07c89 | 292 | struct kernfs_root *kernfs_create_root(struct kernfs_syscall_ops *scops, |
d35258ef | 293 | unsigned int flags, void *priv); |
ba7443bc TH |
294 | void kernfs_destroy_root(struct kernfs_root *root); |
295 | ||
324a56e1 | 296 | struct kernfs_node *kernfs_create_dir_ns(struct kernfs_node *parent, |
bb8b9d09 TH |
297 | const char *name, umode_t mode, |
298 | void *priv, const void *ns); | |
ea015218 EB |
299 | struct kernfs_node *kernfs_create_empty_dir(struct kernfs_node *parent, |
300 | const char *name); | |
2063d608 TH |
301 | struct kernfs_node *__kernfs_create_file(struct kernfs_node *parent, |
302 | const char *name, | |
303 | umode_t mode, loff_t size, | |
304 | const struct kernfs_ops *ops, | |
305 | void *priv, const void *ns, | |
2063d608 | 306 | struct lock_class_key *key); |
324a56e1 TH |
307 | struct kernfs_node *kernfs_create_link(struct kernfs_node *parent, |
308 | const char *name, | |
309 | struct kernfs_node *target); | |
d35258ef | 310 | void kernfs_activate(struct kernfs_node *kn); |
324a56e1 | 311 | void kernfs_remove(struct kernfs_node *kn); |
6b0afc2a TH |
312 | void kernfs_break_active_protection(struct kernfs_node *kn); |
313 | void kernfs_unbreak_active_protection(struct kernfs_node *kn); | |
314 | bool kernfs_remove_self(struct kernfs_node *kn); | |
324a56e1 | 315 | int kernfs_remove_by_name_ns(struct kernfs_node *parent, const char *name, |
879f40d1 | 316 | const void *ns); |
324a56e1 | 317 | int kernfs_rename_ns(struct kernfs_node *kn, struct kernfs_node *new_parent, |
890ece16 | 318 | const char *new_name, const void *new_ns); |
324a56e1 TH |
319 | int kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr); |
320 | void kernfs_notify(struct kernfs_node *kn); | |
879f40d1 | 321 | |
4b93dc9b TH |
322 | const void *kernfs_super_ns(struct super_block *sb); |
323 | struct dentry *kernfs_mount_ns(struct file_system_type *fs_type, int flags, | |
26fc9cd2 JZ |
324 | struct kernfs_root *root, unsigned long magic, |
325 | bool *new_sb_created, const void *ns); | |
4b93dc9b | 326 | void kernfs_kill_sb(struct super_block *sb); |
4e26445f | 327 | struct super_block *kernfs_pin_sb(struct kernfs_root *root, const void *ns); |
4b93dc9b TH |
328 | |
329 | void kernfs_init(void); | |
330 | ||
ba341d55 | 331 | #else /* CONFIG_KERNFS */ |
879f40d1 | 332 | |
df23fc39 | 333 | static inline enum kernfs_node_type kernfs_type(struct kernfs_node *kn) |
cf9e5a73 TH |
334 | { return 0; } /* whatever */ |
335 | ||
324a56e1 | 336 | static inline void kernfs_enable_ns(struct kernfs_node *kn) { } |
cf9e5a73 | 337 | |
324a56e1 | 338 | static inline bool kernfs_ns_enabled(struct kernfs_node *kn) |
ac9bba03 TH |
339 | { return false; } |
340 | ||
3eef34ad TH |
341 | static inline int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen) |
342 | { return -ENOSYS; } | |
343 | ||
9acee9c5 TH |
344 | static inline size_t kernfs_path_len(struct kernfs_node *kn) |
345 | { return 0; } | |
346 | ||
0e0b2afd TH |
347 | static inline int kernfs_path_from_node(struct kernfs_node *root_kn, |
348 | struct kernfs_node *kn, | |
349 | char *buf, size_t buflen) | |
350 | { return -ENOSYS; } | |
351 | ||
9f6df573 AK |
352 | static inline char *kernfs_path(struct kernfs_node *kn, char *buf, |
353 | size_t buflen) | |
3eef34ad TH |
354 | { return NULL; } |
355 | ||
356 | static inline void pr_cont_kernfs_name(struct kernfs_node *kn) { } | |
357 | static inline void pr_cont_kernfs_path(struct kernfs_node *kn) { } | |
358 | ||
359 | static inline struct kernfs_node *kernfs_get_parent(struct kernfs_node *kn) | |
360 | { return NULL; } | |
361 | ||
324a56e1 TH |
362 | static inline struct kernfs_node * |
363 | kernfs_find_and_get_ns(struct kernfs_node *parent, const char *name, | |
ccf73cf3 TH |
364 | const void *ns) |
365 | { return NULL; } | |
bd96f76a TH |
366 | static inline struct kernfs_node * |
367 | kernfs_walk_and_get_ns(struct kernfs_node *parent, const char *path, | |
368 | const void *ns) | |
369 | { return NULL; } | |
ccf73cf3 | 370 | |
324a56e1 TH |
371 | static inline void kernfs_get(struct kernfs_node *kn) { } |
372 | static inline void kernfs_put(struct kernfs_node *kn) { } | |
ccf73cf3 | 373 | |
0c23b225 TH |
374 | static inline struct kernfs_node *kernfs_node_from_dentry(struct dentry *dentry) |
375 | { return NULL; } | |
376 | ||
377 | static inline struct kernfs_root *kernfs_root_from_sb(struct super_block *sb) | |
378 | { return NULL; } | |
379 | ||
fb02915f TH |
380 | static inline struct inode * |
381 | kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn) | |
382 | { return NULL; } | |
383 | ||
80b9bbef | 384 | static inline struct kernfs_root * |
d35258ef TH |
385 | kernfs_create_root(struct kernfs_syscall_ops *scops, unsigned int flags, |
386 | void *priv) | |
ba7443bc TH |
387 | { return ERR_PTR(-ENOSYS); } |
388 | ||
389 | static inline void kernfs_destroy_root(struct kernfs_root *root) { } | |
390 | ||
324a56e1 | 391 | static inline struct kernfs_node * |
bb8b9d09 TH |
392 | kernfs_create_dir_ns(struct kernfs_node *parent, const char *name, |
393 | umode_t mode, void *priv, const void *ns) | |
93b2b8e4 TH |
394 | { return ERR_PTR(-ENOSYS); } |
395 | ||
324a56e1 | 396 | static inline struct kernfs_node * |
2063d608 TH |
397 | __kernfs_create_file(struct kernfs_node *parent, const char *name, |
398 | umode_t mode, loff_t size, const struct kernfs_ops *ops, | |
dfeb0750 | 399 | void *priv, const void *ns, struct lock_class_key *key) |
496f7394 TH |
400 | { return ERR_PTR(-ENOSYS); } |
401 | ||
324a56e1 TH |
402 | static inline struct kernfs_node * |
403 | kernfs_create_link(struct kernfs_node *parent, const char *name, | |
404 | struct kernfs_node *target) | |
5d0e26bb TH |
405 | { return ERR_PTR(-ENOSYS); } |
406 | ||
d35258ef TH |
407 | static inline void kernfs_activate(struct kernfs_node *kn) { } |
408 | ||
324a56e1 | 409 | static inline void kernfs_remove(struct kernfs_node *kn) { } |
879f40d1 | 410 | |
6b0afc2a TH |
411 | static inline bool kernfs_remove_self(struct kernfs_node *kn) |
412 | { return false; } | |
413 | ||
324a56e1 | 414 | static inline int kernfs_remove_by_name_ns(struct kernfs_node *kn, |
879f40d1 TH |
415 | const char *name, const void *ns) |
416 | { return -ENOSYS; } | |
417 | ||
324a56e1 TH |
418 | static inline int kernfs_rename_ns(struct kernfs_node *kn, |
419 | struct kernfs_node *new_parent, | |
890ece16 TH |
420 | const char *new_name, const void *new_ns) |
421 | { return -ENOSYS; } | |
422 | ||
324a56e1 | 423 | static inline int kernfs_setattr(struct kernfs_node *kn, |
5d60418e TH |
424 | const struct iattr *iattr) |
425 | { return -ENOSYS; } | |
426 | ||
324a56e1 | 427 | static inline void kernfs_notify(struct kernfs_node *kn) { } |
024f6471 | 428 | |
4b93dc9b TH |
429 | static inline const void *kernfs_super_ns(struct super_block *sb) |
430 | { return NULL; } | |
431 | ||
432 | static inline struct dentry * | |
433 | kernfs_mount_ns(struct file_system_type *fs_type, int flags, | |
26fc9cd2 JZ |
434 | struct kernfs_root *root, unsigned long magic, |
435 | bool *new_sb_created, const void *ns) | |
4b93dc9b TH |
436 | { return ERR_PTR(-ENOSYS); } |
437 | ||
438 | static inline void kernfs_kill_sb(struct super_block *sb) { } | |
439 | ||
440 | static inline void kernfs_init(void) { } | |
441 | ||
ba341d55 | 442 | #endif /* CONFIG_KERNFS */ |
879f40d1 | 443 | |
324a56e1 TH |
444 | static inline struct kernfs_node * |
445 | kernfs_find_and_get(struct kernfs_node *kn, const char *name) | |
ccf73cf3 | 446 | { |
324a56e1 | 447 | return kernfs_find_and_get_ns(kn, name, NULL); |
ccf73cf3 TH |
448 | } |
449 | ||
bd96f76a TH |
450 | static inline struct kernfs_node * |
451 | kernfs_walk_and_get(struct kernfs_node *kn, const char *path) | |
452 | { | |
453 | return kernfs_walk_and_get_ns(kn, path, NULL); | |
454 | } | |
455 | ||
324a56e1 | 456 | static inline struct kernfs_node * |
bb8b9d09 TH |
457 | kernfs_create_dir(struct kernfs_node *parent, const char *name, umode_t mode, |
458 | void *priv) | |
93b2b8e4 | 459 | { |
bb8b9d09 | 460 | return kernfs_create_dir_ns(parent, name, mode, priv, NULL); |
93b2b8e4 TH |
461 | } |
462 | ||
324a56e1 TH |
463 | static inline struct kernfs_node * |
464 | kernfs_create_file_ns(struct kernfs_node *parent, const char *name, | |
517e64f5 TH |
465 | umode_t mode, loff_t size, const struct kernfs_ops *ops, |
466 | void *priv, const void *ns) | |
467 | { | |
468 | struct lock_class_key *key = NULL; | |
469 | ||
470 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
471 | key = (struct lock_class_key *)&ops->lockdep_key; | |
472 | #endif | |
2063d608 | 473 | return __kernfs_create_file(parent, name, mode, size, ops, priv, ns, |
dfeb0750 | 474 | key); |
517e64f5 TH |
475 | } |
476 | ||
324a56e1 TH |
477 | static inline struct kernfs_node * |
478 | kernfs_create_file(struct kernfs_node *parent, const char *name, umode_t mode, | |
496f7394 TH |
479 | loff_t size, const struct kernfs_ops *ops, void *priv) |
480 | { | |
481 | return kernfs_create_file_ns(parent, name, mode, size, ops, priv, NULL); | |
482 | } | |
483 | ||
324a56e1 | 484 | static inline int kernfs_remove_by_name(struct kernfs_node *parent, |
879f40d1 TH |
485 | const char *name) |
486 | { | |
487 | return kernfs_remove_by_name_ns(parent, name, NULL); | |
488 | } | |
489 | ||
0c23b225 TH |
490 | static inline int kernfs_rename(struct kernfs_node *kn, |
491 | struct kernfs_node *new_parent, | |
492 | const char *new_name) | |
493 | { | |
494 | return kernfs_rename_ns(kn, new_parent, new_name, NULL); | |
495 | } | |
496 | ||
4b93dc9b TH |
497 | static inline struct dentry * |
498 | kernfs_mount(struct file_system_type *fs_type, int flags, | |
26fc9cd2 JZ |
499 | struct kernfs_root *root, unsigned long magic, |
500 | bool *new_sb_created) | |
4b93dc9b | 501 | { |
26fc9cd2 JZ |
502 | return kernfs_mount_ns(fs_type, flags, root, |
503 | magic, new_sb_created, NULL); | |
4b93dc9b TH |
504 | } |
505 | ||
b8441ed2 | 506 | #endif /* __LINUX_KERNFS_H */ |