1 /*
2 * fs/sysfs/sysfs.h - sysfs internal header file
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
11 struct sysfs_open_dirent;
12
13 /* type-specific structures for sysfs_dirent->s_* union members */
14 struct sysfs_elem_dir {
15 struct kobject *kobj;
16 /* children list starts here and goes through sd->s_sibling */
17 struct sysfs_dirent *children;
18 };
19
20 struct sysfs_elem_symlink {
21 struct sysfs_dirent *target_sd;
22 };
23
24 struct sysfs_elem_attr {
25 struct attribute *attr;
26 struct sysfs_open_dirent *open;
27 };
28
29 struct sysfs_elem_bin_attr {
30 struct bin_attribute *bin_attr;
31 struct hlist_head buffers;
32 };
33
34 /*
35 * sysfs_dirent - the building block of sysfs hierarchy. Each and
36 * every sysfs node is represented by single sysfs_dirent.
37 *
38 * As long as s_count reference is held, the sysfs_dirent itself is
39 * accessible. Dereferencing s_elem or any other outer entity
40 * requires s_active reference.
41 */
42 struct sysfs_dirent {
43 atomic_t s_count;
44 atomic_t s_active;
45 struct sysfs_dirent *s_parent;
46 struct sysfs_dirent *s_sibling;
47 const char *s_name;
48
49 union {
50 struct sysfs_elem_dir s_dir;
51 struct sysfs_elem_symlink s_symlink;
52 struct sysfs_elem_attr s_attr;
53 struct sysfs_elem_bin_attr s_bin_attr;
54 };
55
56 unsigned int s_flags;
57 ino_t s_ino;
58 umode_t s_mode;
59 struct iattr *s_iattr;
60 };
61
62 #define SD_DEACTIVATED_BIAS INT_MIN
63
64 #define SYSFS_TYPE_MASK 0x00ff
65 #define SYSFS_DIR 0x0001
66 #define SYSFS_KOBJ_ATTR 0x0002
67 #define SYSFS_KOBJ_BIN_ATTR 0x0004
68 #define SYSFS_KOBJ_LINK 0x0008
69 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
70
71 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
72 #define SYSFS_FLAG_REMOVED 0x0200
73
74 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
75 {
76 return sd->s_flags & SYSFS_TYPE_MASK;
77 }
78
79 /*
80 * Context structure to be used while adding/removing nodes.
81 */
82 struct sysfs_addrm_cxt {
83 struct sysfs_dirent *parent_sd;
84 struct inode *parent_inode;
85 struct sysfs_dirent *removed;
86 int cnt;
87 };
88
89 /*
90 * mount.c
91 */
92 extern struct sysfs_dirent sysfs_root;
93 extern struct super_block *sysfs_sb;
94 extern struct kmem_cache *sysfs_dir_cachep;
95
96 /*
97 * dir.c
98 */
99 extern struct mutex sysfs_mutex;
100 extern struct mutex sysfs_rename_mutex;
101 extern spinlock_t sysfs_assoc_lock;
102
103 extern const struct file_operations sysfs_dir_operations;
104 extern const struct inode_operations sysfs_dir_inode_operations;
105
106 struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
107 struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
108 void sysfs_put_active_two(struct sysfs_dirent *sd);
109 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
110 struct sysfs_dirent *parent_sd);
111 int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
112 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
113 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd);
114 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
115
116 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
117 const unsigned char *name);
118 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
119 const unsigned char *name);
120 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
121
122 void release_sysfs_dirent(struct sysfs_dirent *sd);
123
124 int sysfs_create_subdir(struct kobject *kobj, const char *name,
125 struct sysfs_dirent **p_sd);
126 void sysfs_remove_subdir(struct sysfs_dirent *sd);
127
128 static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
129 {
130 if (sd) {
131 WARN_ON(!atomic_read(&sd->s_count));
132 atomic_inc(&sd->s_count);
133 }
134 return sd;
135 }
136 #define sysfs_get(sd) __sysfs_get(sd)
137
138 static inline void __sysfs_put(struct sysfs_dirent *sd)
139 {
140 if (sd && atomic_dec_and_test(&sd->s_count))
141 release_sysfs_dirent(sd);
142 }
143 #define sysfs_put(sd) __sysfs_put(sd)
144
145 /*
146 * inode.c
147 */
148 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
149 void sysfs_delete_inode(struct inode *inode);
150 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
151 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
152 int sysfs_inode_init(void);
153
154 /*
155 * file.c
156 */
157 extern const struct file_operations sysfs_file_operations;
158
159 int sysfs_add_file(struct sysfs_dirent *dir_sd,
160 const struct attribute *attr, int type);
161
162 int sysfs_add_file_mode(struct sysfs_dirent *dir_sd,
163 const struct attribute *attr, int type, mode_t amode);
164 /*
165 * bin.c
166 */
167 extern const struct file_operations bin_fops;
168 void unmap_bin_file(struct sysfs_dirent *attr_sd);
169
170 /*
171 * symlink.c
172 */
173 extern const struct inode_operations sysfs_symlink_inode_operations;
174
|
This page was automatically generated by the
LXR engine.
|