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