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 vfsmount * sysfs_mount;
  55 extern struct sysfs_dirent sysfs_root;
  56 extern struct kmem_cache *sysfs_dir_cachep;
  57
  58 extern struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd);
  59 extern void sysfs_link_sibling(struct sysfs_dirent *sd);
  60 extern void sysfs_unlink_sibling(struct sysfs_dirent *sd);
  61 extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
  62 extern void sysfs_put_active(struct sysfs_dirent *sd);
  63 extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
  64 extern void sysfs_put_active_two(struct sysfs_dirent *sd);
  65 extern void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt,
  66                               struct sysfs_dirent *parent_sd);
  67 extern void sysfs_add_one(struct sysfs_addrm_cxt *acxt,
  68                           struct sysfs_dirent *sd);
  69 extern void sysfs_remove_one(struct sysfs_addrm_cxt *acxt,
  70                              struct sysfs_dirent *sd);
  71 extern int sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt);
  72
  73 extern void sysfs_delete_inode(struct inode *inode);
  74 extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
  75 extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
  76 extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
  77
  78 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
  79 extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
  80                                               const unsigned char *name);
  81 extern struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd,
  82                                              const unsigned char *name);
  83 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
  84                                              int type);
  85
  86 extern int sysfs_add_file(struct sysfs_dirent *dir_sd,
  87                           const struct attribute *attr, int type);
  88 extern int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
  89 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  90
  91 extern int sysfs_create_subdir(struct kobject *kobj, const char *name,
  92                                struct sysfs_dirent **p_sd);
  93 extern void sysfs_remove_subdir(struct sysfs_dirent *sd);
  94
  95 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  96
  97 extern spinlock_t sysfs_assoc_lock;
  98 extern struct mutex sysfs_mutex;
  99 extern struct super_block * sysfs_sb;
 100 extern const struct file_operations sysfs_dir_operations;
 101 extern const struct file_operations sysfs_file_operations;
 102 extern const struct file_operations bin_fops;
 103 extern const struct inode_operations sysfs_dir_inode_operations;
 104 extern const struct inode_operations sysfs_symlink_inode_operations;
 105
 106 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
 107 {
 108         return sd->s_flags & SYSFS_TYPE_MASK;
 109 }
 110
 111 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 112 {
 113         if (sd) {
 114                 WARN_ON(!atomic_read(&sd->s_count));
 115                 atomic_inc(&sd->s_count);
 116         }
 117         return sd;
 118 }
 119
 120 static inline void sysfs_put(struct sysfs_dirent * sd)
 121 {
 122         if (sd && atomic_dec_and_test(&sd->s_count))
 123                 release_sysfs_dirent(sd);
 124 }
 125
 126 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 127 {
 128         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 129 }