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-rw-r--r--fs/sysfs/sysfs.h236
1 files changed, 12 insertions, 224 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 0af09fbfb3f6..0e2f1cccb812 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -8,248 +8,36 @@
8 * This file is released under the GPLv2. 8 * This file is released under the GPLv2.
9 */ 9 */
10 10
11#include <linux/lockdep.h> 11#ifndef __SYSFS_INTERNAL_H
12#include <linux/kobject_ns.h> 12#define __SYSFS_INTERNAL_H
13#include <linux/fs.h>
14#include <linux/rbtree.h>
15 13
16struct sysfs_open_dirent; 14#include <linux/sysfs.h>
17
18/* type-specific structures for sysfs_dirent->s_* union members */
19struct sysfs_elem_dir {
20 struct kobject *kobj;
21
22 unsigned long subdirs;
23 /* children rbtree starts here and goes through sd->s_rb */
24 struct rb_root children;
25};
26
27struct sysfs_elem_symlink {
28 struct sysfs_dirent *target_sd;
29};
30
31struct sysfs_elem_attr {
32 union {
33 struct attribute *attr;
34 struct bin_attribute *bin_attr;
35 };
36 struct sysfs_open_dirent *open;
37};
38
39struct sysfs_inode_attrs {
40 struct iattr ia_iattr;
41 void *ia_secdata;
42 u32 ia_secdata_len;
43};
44
45/*
46 * sysfs_dirent - the building block of sysfs hierarchy. Each and
47 * every sysfs node is represented by single sysfs_dirent.
48 *
49 * As long as s_count reference is held, the sysfs_dirent itself is
50 * accessible. Dereferencing s_elem or any other outer entity
51 * requires s_active reference.
52 */
53struct sysfs_dirent {
54 atomic_t s_count;
55 atomic_t s_active;
56#ifdef CONFIG_DEBUG_LOCK_ALLOC
57 struct lockdep_map dep_map;
58#endif
59 struct sysfs_dirent *s_parent;
60 const char *s_name;
61
62 struct rb_node s_rb;
63
64 union {
65 struct completion *completion;
66 struct sysfs_dirent *removed_list;
67 } u;
68
69 const void *s_ns; /* namespace tag */
70 unsigned int s_hash; /* ns + name hash */
71 union {
72 struct sysfs_elem_dir s_dir;
73 struct sysfs_elem_symlink s_symlink;
74 struct sysfs_elem_attr s_attr;
75 };
76
77 unsigned short s_flags;
78 umode_t s_mode;
79 unsigned int s_ino;
80 struct sysfs_inode_attrs *s_iattr;
81};
82
83#define SD_DEACTIVATED_BIAS INT_MIN
84
85#define SYSFS_TYPE_MASK 0x00ff
86#define SYSFS_DIR 0x0001
87#define SYSFS_KOBJ_ATTR 0x0002
88#define SYSFS_KOBJ_BIN_ATTR 0x0004
89#define SYSFS_KOBJ_LINK 0x0008
90#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
91#define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
92
93/* identify any namespace tag on sysfs_dirents */
94#define SYSFS_NS_TYPE_MASK 0xf00
95#define SYSFS_NS_TYPE_SHIFT 8
96
97#define SYSFS_FLAG_MASK ~(SYSFS_NS_TYPE_MASK|SYSFS_TYPE_MASK)
98#define SYSFS_FLAG_REMOVED 0x02000
99
100static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
101{
102 return sd->s_flags & SYSFS_TYPE_MASK;
103}
104
105/*
106 * Return any namespace tags on this dirent.
107 * enum kobj_ns_type is defined in linux/kobject.h
108 */
109static inline enum kobj_ns_type sysfs_ns_type(struct sysfs_dirent *sd)
110{
111 return (sd->s_flags & SYSFS_NS_TYPE_MASK) >> SYSFS_NS_TYPE_SHIFT;
112}
113
114#ifdef CONFIG_DEBUG_LOCK_ALLOC
115
116#define sysfs_dirent_init_lockdep(sd) \
117do { \
118 struct attribute *attr = sd->s_attr.attr; \
119 struct lock_class_key *key = attr->key; \
120 if (!key) \
121 key = &attr->skey; \
122 \
123 lockdep_init_map(&sd->dep_map, "s_active", key, 0); \
124} while (0)
125
126/* Test for attributes that want to ignore lockdep for read-locking */
127static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
128{
129 int type = sysfs_type(sd);
130
131 return (type == SYSFS_KOBJ_ATTR || type == SYSFS_KOBJ_BIN_ATTR) &&
132 sd->s_attr.attr->ignore_lockdep;
133}
134
135#else
136
137#define sysfs_dirent_init_lockdep(sd) do {} while (0)
138
139static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
140{
141 return true;
142}
143
144#endif
145
146/*
147 * Context structure to be used while adding/removing nodes.
148 */
149struct sysfs_addrm_cxt {
150 struct sysfs_dirent *removed;
151};
152 15
153/* 16/*
154 * mount.c 17 * mount.c
155 */ 18 */
156 19extern struct kernfs_node *sysfs_root_kn;
157/*
158 * Each sb is associated with a set of namespace tags (i.e.
159 * the network namespace of the task which mounted this sysfs
160 * instance).
161 */
162struct sysfs_super_info {
163 void *ns[KOBJ_NS_TYPES];
164};
165#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
166extern struct sysfs_dirent sysfs_root;
167extern struct kmem_cache *sysfs_dir_cachep;
168 20
169/* 21/*
170 * dir.c 22 * dir.c
171 */ 23 */
172extern struct mutex sysfs_mutex;
173extern spinlock_t sysfs_symlink_target_lock; 24extern spinlock_t sysfs_symlink_target_lock;
174extern const struct dentry_operations sysfs_dentry_ops;
175
176extern const struct file_operations sysfs_dir_operations;
177extern const struct inode_operations sysfs_dir_inode_operations;
178 25
179struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); 26void sysfs_warn_dup(struct kernfs_node *parent, const char *name);
180void sysfs_put_active(struct sysfs_dirent *sd);
181void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt);
182void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name);
183int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
184 struct sysfs_dirent *parent_sd);
185int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
186 struct sysfs_dirent *parent_sd);
187void sysfs_remove(struct sysfs_dirent *sd);
188int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name,
189 const void *ns);
190void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
191
192struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
193 const unsigned char *name,
194 const void *ns);
195struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
196
197void release_sysfs_dirent(struct sysfs_dirent *sd);
198
199int sysfs_create_subdir(struct kobject *kobj, const char *name,
200 struct sysfs_dirent **p_sd);
201
202int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd,
203 const char *new_name, const void *new_ns);
204
205static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
206{
207 if (sd) {
208 WARN_ON(!atomic_read(&sd->s_count));
209 atomic_inc(&sd->s_count);
210 }
211 return sd;
212}
213#define sysfs_get(sd) __sysfs_get(sd)
214
215static inline void __sysfs_put(struct sysfs_dirent *sd)
216{
217 if (sd && atomic_dec_and_test(&sd->s_count))
218 release_sysfs_dirent(sd);
219}
220#define sysfs_put(sd) __sysfs_put(sd)
221
222/*
223 * inode.c
224 */
225struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd);
226void sysfs_evict_inode(struct inode *inode);
227int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr);
228int sysfs_permission(struct inode *inode, int mask);
229int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
230int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
231 struct kstat *stat);
232int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
233 size_t size, int flags);
234int sysfs_inode_init(void);
235 27
236/* 28/*
237 * file.c 29 * file.c
238 */ 30 */
239extern const struct file_operations sysfs_file_operations; 31int sysfs_add_file(struct kernfs_node *parent,
240extern const struct file_operations sysfs_bin_operations; 32 const struct attribute *attr, bool is_bin);
241 33int sysfs_add_file_mode_ns(struct kernfs_node *parent,
242int sysfs_add_file(struct sysfs_dirent *dir_sd, 34 const struct attribute *attr, bool is_bin,
243 const struct attribute *attr, int type);
244
245int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
246 const struct attribute *attr, int type,
247 umode_t amode, const void *ns); 35 umode_t amode, const void *ns);
248void sysfs_unmap_bin_file(struct sysfs_dirent *sd);
249 36
250/* 37/*
251 * symlink.c 38 * symlink.c
252 */ 39 */
253extern const struct inode_operations sysfs_symlink_inode_operations; 40int sysfs_create_link_sd(struct kernfs_node *kn, struct kobject *target,
254int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,
255 const char *name); 41 const char *name);
42
43#endif /* __SYSFS_INTERNAL_H */
generated by cgit v1.2.2 (git 2.25.0) at 2025-06-03 04:41:56 -0400