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 extern struct vfsmount * sysfs_mount;
  48 extern struct kmem_cache *sysfs_dir_cachep;
  49
  50 extern struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd);
  51 extern void sysfs_put_active(struct sysfs_dirent *sd);
  52 extern struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd);
  53 extern void sysfs_put_active_two(struct sysfs_dirent *sd);
  54 extern void sysfs_deactivate(struct sysfs_dirent *sd);
  55
  56 extern void sysfs_delete_inode(struct inode *inode);
  57 extern void sysfs_init_inode(struct sysfs_dirent *sd, struct inode *inode);
  58 extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
  59 extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
  60
  61 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
  62 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
  63 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
  64                                              int type);
  65 extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
  66                                 struct sysfs_dirent *parent_sd,
  67                                 struct dentry *dentry);
  68
  69 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  70 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  71 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  72
  73 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  74 extern void sysfs_remove_subdir(struct dentry *);
  75
  76 extern void sysfs_drop_dentry(struct sysfs_dirent *sd);
  77 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  78
  79 extern spinlock_t sysfs_lock;
  80 extern spinlock_t kobj_sysfs_assoc_lock;
  81 extern struct rw_semaphore sysfs_rename_sem;
  82 extern struct super_block * sysfs_sb;
  83 extern const struct file_operations sysfs_dir_operations;
  84 extern const struct file_operations sysfs_file_operations;
  85 extern const struct file_operations bin_fops;
  86 extern const struct inode_operations sysfs_dir_inode_operations;
  87 extern const struct inode_operations sysfs_symlink_inode_operations;
  88
  89 static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
  90 {
  91         return sd->s_flags & SYSFS_TYPE_MASK;
  92 }
  93
  94 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
  95 {
  96         if (sd) {
  97                 WARN_ON(!atomic_read(&sd->s_count));
  98                 atomic_inc(&sd->s_count);
  99         }
 100         return sd;
 101 }
 102
 103 static inline void sysfs_put(struct sysfs_dirent * sd)
 104 {
 105         if (sd && atomic_dec_and_test(&sd->s_count))
 106                 release_sysfs_dirent(sd);
 107 }
 108
 109 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 110 {
 111         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 112 }