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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 | #include <linux/lockdep.h> |
12 | #include <linux/fs.h> |
13 | |
14 | struct sysfs_open_dirent; |
15 | |
16 | /* type-specific structures for sysfs_dirent->s_* union members */ |
17 | struct sysfs_elem_dir { |
18 | struct kobject *kobj; |
19 | /* children list starts here and goes through sd->s_sibling */ |
20 | struct sysfs_dirent *children; |
21 | }; |
22 | |
23 | struct sysfs_elem_symlink { |
24 | struct sysfs_dirent *target_sd; |
25 | }; |
26 | |
27 | struct sysfs_elem_attr { |
28 | struct attribute *attr; |
29 | struct sysfs_open_dirent *open; |
30 | }; |
31 | |
32 | struct sysfs_elem_bin_attr { |
33 | struct bin_attribute *bin_attr; |
34 | struct hlist_head buffers; |
35 | }; |
36 | |
37 | struct sysfs_inode_attrs { |
38 | struct iattr ia_iattr; |
39 | void *ia_secdata; |
40 | u32 ia_secdata_len; |
41 | }; |
42 | |
43 | /* |
44 | * sysfs_dirent - the building block of sysfs hierarchy. Each and |
45 | * every sysfs node is represented by single sysfs_dirent. |
46 | * |
47 | * As long as s_count reference is held, the sysfs_dirent itself is |
48 | * accessible. Dereferencing s_elem or any other outer entity |
49 | * requires s_active reference. |
50 | */ |
51 | struct sysfs_dirent { |
52 | atomic_t s_count; |
53 | atomic_t s_active; |
54 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
55 | struct lockdep_map dep_map; |
56 | #endif |
57 | struct sysfs_dirent *s_parent; |
58 | struct sysfs_dirent *s_sibling; |
59 | const char *s_name; |
60 | |
61 | union { |
62 | struct sysfs_elem_dir s_dir; |
63 | struct sysfs_elem_symlink s_symlink; |
64 | struct sysfs_elem_attr s_attr; |
65 | struct sysfs_elem_bin_attr s_bin_attr; |
66 | }; |
67 | |
68 | unsigned int s_flags; |
69 | unsigned short s_mode; |
70 | ino_t s_ino; |
71 | struct sysfs_inode_attrs *s_iattr; |
72 | }; |
73 | |
74 | #define SD_DEACTIVATED_BIAS INT_MIN |
75 | |
76 | #define SYSFS_TYPE_MASK 0x00ff |
77 | #define SYSFS_DIR 0x0001 |
78 | #define SYSFS_KOBJ_ATTR 0x0002 |
79 | #define SYSFS_KOBJ_BIN_ATTR 0x0004 |
80 | #define SYSFS_KOBJ_LINK 0x0008 |
81 | #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
82 | #define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR) |
83 | |
84 | #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK |
85 | #define SYSFS_FLAG_REMOVED 0x0200 |
86 | |
87 | static inline unsigned int sysfs_type(struct sysfs_dirent *sd) |
88 | { |
89 | return sd->s_flags & SYSFS_TYPE_MASK; |
90 | } |
91 | |
92 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
93 | #define sysfs_dirent_init_lockdep(sd) \ |
94 | do { \ |
95 | struct attribute *attr = sd->s_attr.attr; \ |
96 | struct lock_class_key *key = attr->key; \ |
97 | if (!key) \ |
98 | key = &attr->skey; \ |
99 | \ |
100 | lockdep_init_map(&sd->dep_map, "s_active", key, 0); \ |
101 | } while(0) |
102 | #else |
103 | #define sysfs_dirent_init_lockdep(sd) do {} while(0) |
104 | #endif |
105 | |
106 | /* |
107 | * Context structure to be used while adding/removing nodes. |
108 | */ |
109 | struct sysfs_addrm_cxt { |
110 | struct sysfs_dirent *parent_sd; |
111 | struct sysfs_dirent *removed; |
112 | }; |
113 | |
114 | /* |
115 | * mount.c |
116 | */ |
117 | extern struct sysfs_dirent sysfs_root; |
118 | extern struct kmem_cache *sysfs_dir_cachep; |
119 | |
120 | /* |
121 | * dir.c |
122 | */ |
123 | extern struct mutex sysfs_mutex; |
124 | extern spinlock_t sysfs_assoc_lock; |
125 | |
126 | extern const struct file_operations sysfs_dir_operations; |
127 | extern const struct inode_operations sysfs_dir_inode_operations; |
128 | |
129 | struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); |
130 | struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); |
131 | void sysfs_put_active(struct sysfs_dirent *sd); |
132 | void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, |
133 | struct sysfs_dirent *parent_sd); |
134 | int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
135 | int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
136 | void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
137 | void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); |
138 | |
139 | struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
140 | const unsigned char *name); |
141 | struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, |
142 | const unsigned char *name); |
143 | struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); |
144 | |
145 | void release_sysfs_dirent(struct sysfs_dirent *sd); |
146 | |
147 | int sysfs_create_subdir(struct kobject *kobj, const char *name, |
148 | struct sysfs_dirent **p_sd); |
149 | void sysfs_remove_subdir(struct sysfs_dirent *sd); |
150 | |
151 | int sysfs_rename(struct sysfs_dirent *sd, |
152 | struct sysfs_dirent *new_parent_sd, const char *new_name); |
153 | |
154 | static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd) |
155 | { |
156 | if (sd) { |
157 | WARN_ON(!atomic_read(&sd->s_count)); |
158 | atomic_inc(&sd->s_count); |
159 | } |
160 | return sd; |
161 | } |
162 | #define sysfs_get(sd) __sysfs_get(sd) |
163 | |
164 | static inline void __sysfs_put(struct sysfs_dirent *sd) |
165 | { |
166 | if (sd && atomic_dec_and_test(&sd->s_count)) |
167 | release_sysfs_dirent(sd); |
168 | } |
169 | #define sysfs_put(sd) __sysfs_put(sd) |
170 | |
171 | /* |
172 | * inode.c |
173 | */ |
174 | struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd); |
175 | void sysfs_delete_inode(struct inode *inode); |
176 | int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr); |
177 | int sysfs_permission(struct inode *inode, int mask); |
178 | int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); |
179 | int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); |
180 | int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
181 | size_t size, int flags); |
182 | int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); |
183 | int sysfs_inode_init(void); |
184 | |
185 | /* |
186 | * file.c |
187 | */ |
188 | extern const struct file_operations sysfs_file_operations; |
189 | |
190 | int sysfs_add_file(struct sysfs_dirent *dir_sd, |
191 | const struct attribute *attr, int type); |
192 | |
193 | int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, |
194 | const struct attribute *attr, int type, mode_t amode); |
195 | /* |
196 | * bin.c |
197 | */ |
198 | extern const struct file_operations bin_fops; |
199 | void unmap_bin_file(struct sysfs_dirent *attr_sd); |
200 | |
201 | /* |
202 | * symlink.c |
203 | */ |
204 | extern const struct inode_operations sysfs_symlink_inode_operations; |
205 |
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