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-rw-r--r--fs/sysfs/sysfs.h169
1 files changed, 83 insertions, 86 deletions
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 502c949c402d..6a37f2386a8d 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -1,9 +1,40 @@
1struct sysfs_elem_dir {
2 struct kobject * kobj;
3};
4
5struct sysfs_elem_symlink {
6 struct sysfs_dirent * target_sd;
7};
8
9struct sysfs_elem_attr {
10 struct attribute * attr;
11};
12
13struct sysfs_elem_bin_attr {
14 struct bin_attribute * bin_attr;
15};
16
17/*
18 * As long as s_count reference is held, the sysfs_dirent itself is
19 * accessible. Dereferencing s_elem or any other outer entity
20 * requires s_active reference.
21 */
1struct sysfs_dirent { 22struct sysfs_dirent {
2 atomic_t s_count; 23 atomic_t s_count;
3 struct list_head s_sibling; 24 atomic_t s_active;
4 struct list_head s_children; 25 struct sysfs_dirent * s_parent;
5 void * s_element; 26 struct sysfs_dirent * s_sibling;
6 int s_type; 27 struct sysfs_dirent * s_children;
28 const char * s_name;
29
30 union {
31 struct sysfs_elem_dir dir;
32 struct sysfs_elem_symlink symlink;
33 struct sysfs_elem_attr attr;
34 struct sysfs_elem_bin_attr bin_attr;
35 } s_elem;
36
37 unsigned int s_flags;
7 umode_t s_mode; 38 umode_t s_mode;
8 ino_t s_ino; 39 ino_t s_ino;
9 struct dentry * s_dentry; 40 struct dentry * s_dentry;
@@ -11,30 +42,60 @@ struct sysfs_dirent {
11 atomic_t s_event; 42 atomic_t s_event;
12}; 43};
13 44
45#define SD_DEACTIVATED_BIAS INT_MIN
46
47struct sysfs_addrm_cxt {
48 struct sysfs_dirent *parent_sd;
49 struct inode *parent_inode;
50 struct sysfs_dirent *removed;
51 int cnt;
52};
53
14extern struct vfsmount * sysfs_mount; 54extern struct vfsmount * sysfs_mount;
55extern struct sysfs_dirent sysfs_root;
15extern struct kmem_cache *sysfs_dir_cachep; 56extern struct kmem_cache *sysfs_dir_cachep;
16 57
17extern void sysfs_delete_inode(struct inode *inode); 58extern struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
18extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); 59extern void sysfs_link_sibling(struct sysfs_dirent *sd);
19extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); 60extern void sysfs_unlink_sibling(struct sysfs_dirent *sd);
61extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
62extern void sysfs_put_active(struct sysfs_dirent *sd);
63extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
64extern void sysfs_put_active_two(struct sysfs_dirent *sd);
65extern void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
66 struct sysfs_dirent *parent_sd);
67extern void sysfs_add_one(struct sysfs_addrm_cxt *acxt,
68 struct sysfs_dirent *sd);
69extern void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
70 struct sysfs_dirent *sd);
71extern int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
20 72
21extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *); 73extern void sysfs_delete_inode(struct inode *inode);
22extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, 74extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
23 umode_t, int); 75extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
24 76extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
25extern int sysfs_add_file(struct dentry *, const struct attribute *, int); 77
26extern int sysfs_hash_and_remove(struct dentry * dir, const char * name); 78extern void release_sysfs_dirent(struct sysfs_dirent * sd);
79extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
80 const unsigned char *name);
81extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
82 const unsigned char *name);
83extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
84 int type);
85
86extern int sysfs_add_file(struct sysfs_dirent *dir_sd,
87 const struct attribute *attr, int type);
88extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
27extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name); 89extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
28 90
29extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); 91extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
30extern void sysfs_remove_subdir(struct dentry *); 92 struct sysfs_dirent **p_sd);
93extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
31 94
32extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
33extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
34extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 95extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
35 96
36extern spinlock_t sysfs_lock; 97extern spinlock_t sysfs_assoc_lock;
37extern struct rw_semaphore sysfs_rename_sem; 98extern struct mutex sysfs_mutex;
38extern struct super_block * sysfs_sb; 99extern struct super_block * sysfs_sb;
39extern const struct file_operations sysfs_dir_operations; 100extern const struct file_operations sysfs_dir_operations;
40extern const struct file_operations sysfs_file_operations; 101extern const struct file_operations sysfs_file_operations;
@@ -42,73 +103,9 @@ extern const struct file_operations bin_fops;
42extern const struct inode_operations sysfs_dir_inode_operations; 103extern const struct inode_operations sysfs_dir_inode_operations;
43extern const struct inode_operations sysfs_symlink_inode_operations; 104extern const struct inode_operations sysfs_symlink_inode_operations;
44 105
45struct sysfs_symlink { 106static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
46 char * link_name;
47 struct kobject * target_kobj;
48};
49
50struct sysfs_buffer {
51 struct list_head associates;
52 size_t count;
53 loff_t pos;
54 char * page;
55 struct sysfs_ops * ops;
56 struct semaphore sem;
57 int orphaned;
58 int needs_read_fill;
59 int event;
60};
61
62struct sysfs_buffer_collection {
63 struct list_head associates;
64};
65
66static inline struct kobject * to_kobj(struct dentry * dentry)
67{
68 struct sysfs_dirent * sd = dentry->d_fsdata;
69 return ((struct kobject *) sd->s_element);
70}
71
72static inline struct attribute * to_attr(struct dentry * dentry)
73{ 107{
74 struct sysfs_dirent * sd = dentry->d_fsdata; 108 return sd->s_flags & SYSFS_TYPE_MASK;
75 return ((struct attribute *) sd->s_element);
76}
77
78static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
79{
80 struct sysfs_dirent * sd = dentry->d_fsdata;
81 return ((struct bin_attribute *) sd->s_element);
82}
83
84static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
85{
86 struct kobject * kobj = NULL;
87
88 spin_lock(&dcache_lock);
89 if (!d_unhashed(dentry)) {
90 struct sysfs_dirent * sd = dentry->d_fsdata;
91 if (sd->s_type & SYSFS_KOBJ_LINK) {
92 struct sysfs_symlink * sl = sd->s_element;
93 kobj = kobject_get(sl->target_kobj);
94 } else
95 kobj = kobject_get(sd->s_element);
96 }
97 spin_unlock(&dcache_lock);
98
99 return kobj;
100}
101
102static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
103{
104 if (sd->s_type & SYSFS_KOBJ_LINK) {
105 struct sysfs_symlink * sl = sd->s_element;
106 kfree(sl->link_name);
107 kobject_put(sl->target_kobj);
108 kfree(sl);
109 }
110 kfree(sd->s_iattr);
111 kmem_cache_free(sysfs_dir_cachep, sd);
112} 109}
113 110
114static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 111static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
@@ -122,7 +119,7 @@ static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
122 119
123static inline void sysfs_put(struct sysfs_dirent * sd) 120static inline void sysfs_put(struct sysfs_dirent * sd)
124{ 121{
125 if (atomic_dec_and_test(&sd->s_count)) 122 if (sd && atomic_dec_and_test(&sd->s_count))
126 release_sysfs_dirent(sd); 123 release_sysfs_dirent(sd);
127} 124}
128 125
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 16:30:58 -0500