fs/sysfs/sysfs.h

   1
   2 extern struct vfsmount * sysfs_mount;
   3 extern kmem_cache_t *sysfs_dir_cachep;
   4
   5 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
   6 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
   7
   8 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
   9 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
  10                                 umode_t, int);
  11
  12 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  13 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  14 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  15
  16 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  17 extern void sysfs_remove_subdir(struct dentry *);
  18
  19 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
  20 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
  21 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  22
  23 extern struct rw_semaphore sysfs_rename_sem;
  24 extern struct super_block * sysfs_sb;
  25 extern const struct file_operations sysfs_dir_operations;
  26 extern const struct file_operations sysfs_file_operations;
  27 extern const struct file_operations bin_fops;
  28 extern struct inode_operations sysfs_dir_inode_operations;
  29 extern struct inode_operations sysfs_symlink_inode_operations;
  30
  31 struct sysfs_symlink {
  32         char * link_name;
  33         struct kobject * target_kobj;
  34 };
  35
  36 static inline struct kobject * to_kobj(struct dentry * dentry)
  37 {
  38         struct sysfs_dirent * sd = dentry->d_fsdata;
  39         return ((struct kobject *) sd->s_element);
  40 }
  41
  42 static inline struct attribute * to_attr(struct dentry * dentry)
  43 {
  44         struct sysfs_dirent * sd = dentry->d_fsdata;
  45         return ((struct attribute *) sd->s_element);
  46 }
  47
  48 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  49 {
  50         struct sysfs_dirent * sd = dentry->d_fsdata;
  51         return ((struct bin_attribute *) sd->s_element);
  52 }
  53
  54 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  55 {
  56         struct kobject * kobj = NULL;
  57
  58         spin_lock(&dcache_lock);
  59         if (!d_unhashed(dentry)) {
  60                 struct sysfs_dirent * sd = dentry->d_fsdata;
  61                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  62                         struct sysfs_symlink * sl = sd->s_element;
  63                         kobj = kobject_get(sl->target_kobj);
  64                 } else
  65                         kobj = kobject_get(sd->s_element);
  66         }
  67         spin_unlock(&dcache_lock);
  68
  69         return kobj;
  70 }
  71
  72 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
  73 {
  74         if (sd->s_type & SYSFS_KOBJ_LINK) {
  75                 struct sysfs_symlink * sl = sd->s_element;
  76                 kfree(sl->link_name);
  77                 kobject_put(sl->target_kobj);
  78                 kfree(sl);
  79         }
  80         kfree(sd->s_iattr);
  81         kmem_cache_free(sysfs_dir_cachep, sd);
  82 }
  83
  84 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
  85 {
  86         if (sd) {
  87                 WARN_ON(!atomic_read(&sd->s_count));
  88                 atomic_inc(&sd->s_count);
  89         }
  90         return sd;
  91 }
  92
  93 static inline void sysfs_put(struct sysfs_dirent * sd)
  94 {
  95         if (atomic_dec_and_test(&sd->s_count))
  96                 release_sysfs_dirent(sd);
  97 }
  98