fs/sysfs/sysfs.h

   1 struct sysfs_elem_dir {
   2         struct kobject          * kobj;
   3 };
   4
   5 struct sysfs_elem_symlink {
   6         struct sysfs_dirent     * target_sd;
   7 };
   8
   9 struct sysfs_elem_attr {
  10         struct attribute        * attr;
  11 };
  12
  13 struct 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  */
  22 struct sysfs_dirent {
  23         atomic_t                s_count;
  24         atomic_t                s_active;
  25         struct sysfs_dirent     * s_parent;
  26         struct sysfs_dirent     * s_sibling;
  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;
  38         umode_t                 s_mode;
  39         ino_t                   s_ino;
  40         struct dentry           * s_dentry;
  41         struct iattr            * s_iattr;
  42         atomic_t                s_event;
  43 };
  44
  45 #define SD_DEACTIVATED_BIAS     INT_MIN
  46
  47 struct sysfs_addrm_cxt {
  48         struct sysfs_dirent     *parent_sd;
  49         struct inode            *parent_inode;
  50         struct sysfs_dirent     *removed;
  51         int                     cnt;
  52 };
  53
  54 extern struct sysfs_dirent sysfs_root;
  55 extern struct kmem_cache *sysfs_dir_cachep;
  56
  57 extern struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
  58 extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
  59 extern void sysfs_put_active(struct sysfs_dirent *sd);
  60 extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
  61 extern void sysfs_put_active_two(struct sysfs_dirent *sd);
  62 extern void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
  63                               struct sysfs_dirent *parent_sd);
  64 extern int sysfs_add_one(struct sysfs_addrm_cxt *acxt,
  65                           struct sysfs_dirent *sd);
  66 extern void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
  67                              struct sysfs_dirent *sd);
  68 extern void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
  69
  70 extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
  71
  72 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
  73 extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
  74                                               const unsigned char *name);
  75 extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
  76                                              const unsigned char *name);
  77 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
  78                                              int type);
  79
  80 extern int sysfs_add_file(struct sysfs_dirent *dir_sd,
  81                           const struct attribute *attr, int type);
  82 extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
  83 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  84
  85 extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
  86                                struct sysfs_dirent **p_sd);
  87 extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
  88
  89 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  90
  91 extern spinlock_t sysfs_assoc_lock;
  92 extern struct mutex sysfs_mutex;
  93 extern struct mutex sysfs_rename_mutex;
  94 extern struct super_block * sysfs_sb;
  95 extern const struct file_operations sysfs_dir_operations;
  96 extern const struct file_operations sysfs_file_operations;
  97 extern const struct file_operations bin_fops;
  98 extern const struct inode_operations sysfs_dir_inode_operations;
  99 extern const struct inode_operations sysfs_symlink_inode_operations;
 100
 101 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
 102 {
 103         return sd->s_flags & SYSFS_TYPE_MASK;
 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 }