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