2 * fs/sysfs/sysfs.h - sysfs internal header file
4 * Copyright (c) 2001-3 Patrick Mochel
5 * Copyright (c) 2007 SUSE Linux Products GmbH
6 * Copyright (c) 2007 Tejun Heo <teheo@suse.de>
8 * This file is released under the GPLv2.
11 #include <linux/lockdep.h>
12 #include <linux/kobject_ns.h>
14 #include <linux/rbtree.h>
16 struct sysfs_open_dirent;
18 /* type-specific structures for sysfs_dirent->s_* union members */
19 struct sysfs_elem_dir {
20 unsigned long subdirs;
21 /* children rbtree starts here and goes through sd->s_rb */
22 struct rb_root children;
25 struct sysfs_elem_symlink {
26 struct sysfs_dirent *target_sd;
29 struct sysfs_elem_attr {
30 const struct kernfs_ops *ops;
31 struct sysfs_open_dirent *open;
35 struct sysfs_inode_attrs {
36 struct iattr ia_iattr;
42 * sysfs_dirent - the building block of sysfs hierarchy. Each and
43 * every sysfs node is represented by single sysfs_dirent.
45 * As long as s_count reference is held, the sysfs_dirent itself is
46 * accessible. Dereferencing s_elem or any other outer entity
47 * requires s_active reference.
52 #ifdef CONFIG_DEBUG_LOCK_ALLOC
53 struct lockdep_map dep_map;
55 struct sysfs_dirent *s_parent;
61 struct completion *completion;
62 struct sysfs_dirent *removed_list;
65 const void *s_ns; /* namespace tag */
66 unsigned int s_hash; /* ns + name hash */
68 struct sysfs_elem_dir s_dir;
69 struct sysfs_elem_symlink s_symlink;
70 struct sysfs_elem_attr s_attr;
75 unsigned short s_flags;
78 struct sysfs_inode_attrs *s_iattr;
81 #define SD_DEACTIVATED_BIAS INT_MIN
83 #define SYSFS_TYPE_MASK 0x00ff
84 #define SYSFS_DIR 0x0001
85 #define SYSFS_KOBJ_ATTR 0x0002
86 #define SYSFS_KOBJ_BIN_ATTR 0x0004
87 #define SYSFS_KOBJ_LINK 0x0008
88 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
89 #define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR)
91 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
92 #define SYSFS_FLAG_NS 0x01000
93 #define SYSFS_FLAG_REMOVED 0x02000
94 #define SYSFS_FLAG_HAS_SEQ_SHOW 0x04000
95 #define SYSFS_FLAG_HAS_MMAP 0x08000
97 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
99 return sd->s_flags & SYSFS_TYPE_MASK;
102 #ifdef CONFIG_DEBUG_LOCK_ALLOC
104 #define sysfs_dirent_init_lockdep(sd) \
106 struct attribute *attr = sd->priv; \
107 struct lock_class_key *key = attr->key; \
111 lockdep_init_map(&sd->dep_map, "s_active", key, 0); \
114 /* Test for attributes that want to ignore lockdep for read-locking */
115 static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
117 struct attribute *attr = sd->priv;
118 int type = sysfs_type(sd);
120 return (type == SYSFS_KOBJ_ATTR || type == SYSFS_KOBJ_BIN_ATTR) &&
121 attr->ignore_lockdep;
126 #define sysfs_dirent_init_lockdep(sd) do {} while (0)
128 static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd)
136 * Context structure to be used while adding/removing nodes.
138 struct sysfs_addrm_cxt {
139 struct sysfs_dirent *removed;
147 * Each sb is associated with one namespace tag, currently the network
148 * namespace of the task which mounted this sysfs instance. If multiple
149 * tags become necessary, make the following an array and compare
150 * sysfs_dirent tag against every entry.
152 struct sysfs_super_info {
155 #define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
156 extern struct sysfs_dirent sysfs_root;
157 extern struct kmem_cache *sysfs_dir_cachep;
162 extern struct mutex sysfs_mutex;
163 extern spinlock_t sysfs_symlink_target_lock;
164 extern const struct dentry_operations sysfs_dentry_ops;
166 extern const struct file_operations sysfs_dir_operations;
167 extern const struct inode_operations sysfs_dir_inode_operations;
169 struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
170 void sysfs_put_active(struct sysfs_dirent *sd);
171 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt);
172 void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name);
173 int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
174 struct sysfs_dirent *parent_sd);
175 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd,
176 struct sysfs_dirent *parent_sd);
177 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
179 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
180 const unsigned char *name,
182 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type);
184 void release_sysfs_dirent(struct sysfs_dirent *sd);
186 static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd)
189 WARN_ON(!atomic_read(&sd->s_count));
190 atomic_inc(&sd->s_count);
194 #define sysfs_get(sd) __sysfs_get(sd)
196 static inline void __sysfs_put(struct sysfs_dirent *sd)
198 if (sd && atomic_dec_and_test(&sd->s_count))
199 release_sysfs_dirent(sd);
201 #define sysfs_put(sd) __sysfs_put(sd)
206 struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd);
207 void sysfs_evict_inode(struct inode *inode);
208 int sysfs_permission(struct inode *inode, int mask);
209 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
210 int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
212 int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value,
213 size_t size, int flags);
214 int sysfs_inode_init(void);
219 extern const struct file_operations kernfs_file_operations;
221 int sysfs_add_file(struct sysfs_dirent *dir_sd,
222 const struct attribute *attr, int type);
224 int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd,
225 const struct attribute *attr, int type,
226 umode_t amode, const void *ns);
227 void sysfs_unmap_bin_file(struct sysfs_dirent *sd);
232 extern const struct inode_operations sysfs_symlink_inode_operations;
233 int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target,