fs/sysfs/sysfs.h

   1 struct sysfs_dirent {
   2         atomic_t                s_count;
   3         struct sysfs_dirent     * s_parent;
   4         struct list_head        s_sibling;
   5         struct list_head        s_children;
   6         const char              * s_name;
   7         void                    * s_element;
   8         int                     s_type;
   9         umode_t                 s_mode;
  10         ino_t                   s_ino;
  11         struct dentry           * s_dentry;
  12         struct iattr            * s_iattr;
  13         atomic_t                s_event;
  14 };
  15
  16 extern struct vfsmount * sysfs_mount;
  17 extern struct kmem_cache *sysfs_dir_cachep;
  18
  19 extern void sysfs_delete_inode(struct inode *inode);
  20 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
  21 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
  22
  23 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
  24 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
  25 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, void *element,
  26                                              umode_t mode, int type);
  27 extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
  28                                 struct sysfs_dirent *parent_sd,
  29                                 struct dentry *dentry);
  30
  31 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  32 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  33 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  34
  35 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  36 extern void sysfs_remove_subdir(struct dentry *);
  37
  38 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
  39 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  40
  41 extern spinlock_t sysfs_lock;
  42 extern struct rw_semaphore sysfs_rename_sem;
  43 extern struct super_block * sysfs_sb;
  44 extern const struct file_operations sysfs_dir_operations;
  45 extern const struct file_operations sysfs_file_operations;
  46 extern const struct file_operations bin_fops;
  47 extern const struct inode_operations sysfs_dir_inode_operations;
  48 extern const struct inode_operations sysfs_symlink_inode_operations;
  49
  50 struct sysfs_symlink {
  51         struct kobject * target_kobj;
  52 };
  53
  54 struct sysfs_buffer {
  55         struct list_head                associates;
  56         size_t                          count;
  57         loff_t                          pos;
  58         char                            * page;
  59         struct sysfs_ops                * ops;
  60         struct semaphore                sem;
  61         int                             orphaned;
  62         int                             needs_read_fill;
  63         int                             event;
  64 };
  65
  66 struct sysfs_buffer_collection {
  67         struct list_head        associates;
  68 };
  69
  70 static inline struct kobject * to_kobj(struct dentry * dentry)
  71 {
  72         struct sysfs_dirent * sd = dentry->d_fsdata;
  73         return ((struct kobject *) sd->s_element);
  74 }
  75
  76 static inline struct attribute * to_attr(struct dentry * dentry)
  77 {
  78         struct sysfs_dirent * sd = dentry->d_fsdata;
  79         return ((struct attribute *) sd->s_element);
  80 }
  81
  82 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  83 {
  84         struct sysfs_dirent * sd = dentry->d_fsdata;
  85         return ((struct bin_attribute *) sd->s_element);
  86 }
  87
  88 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  89 {
  90         struct kobject * kobj = NULL;
  91
  92         spin_lock(&dcache_lock);
  93         if (!d_unhashed(dentry)) {
  94                 struct sysfs_dirent * sd = dentry->d_fsdata;
  95                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  96                         struct sysfs_symlink * sl = sd->s_element;
  97                         kobj = kobject_get(sl->target_kobj);
  98                 } else
  99                         kobj = kobject_get(sd->s_element);
 100         }
 101         spin_unlock(&dcache_lock);
 102
 103         return kobj;
 104 }
 105
 106 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 107 {
 108         if (sd) {
 109                 WARN_ON(!atomic_read(&sd->s_count));
 110                 atomic_inc(&sd->s_count);
 111         }
 112         return sd;
 113 }
 114
 115 static inline void sysfs_put(struct sysfs_dirent * sd)
 116 {
 117         if (sd && atomic_dec_and_test(&sd->s_count))
 118                 release_sysfs_dirent(sd);
 119 }
 120
 121 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 122 {
 123         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 124 }