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 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 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  21
  22 extern struct rw_semaphore sysfs_rename_sem;
  23 extern struct super_block * sysfs_sb;
  24 extern const struct file_operations sysfs_dir_operations;
  25 extern const struct file_operations sysfs_file_operations;
  26 extern const struct file_operations bin_fops;
  27 extern struct inode_operations sysfs_dir_inode_operations;
  28 extern struct inode_operations sysfs_symlink_inode_operations;
  29
  30 struct sysfs_symlink {
  31         char * link_name;
  32         struct kobject * target_kobj;
  33 };
  34
  35 static inline struct kobject * to_kobj(struct dentry * dentry)
  36 {
  37         struct sysfs_dirent * sd = dentry->d_fsdata;
  38         return ((struct kobject *) sd->s_element);
  39 }
  40
  41 static inline struct attribute * to_attr(struct dentry * dentry)
  42 {
  43         struct sysfs_dirent * sd = dentry->d_fsdata;
  44         return ((struct attribute *) sd->s_element);
  45 }
  46
  47 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  48 {
  49         struct sysfs_dirent * sd = dentry->d_fsdata;
  50         return ((struct bin_attribute *) sd->s_element);
  51 }
  52
  53 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  54 {
  55         struct kobject * kobj = NULL;
  56
  57         spin_lock(&dcache_lock);
  58         if (!d_unhashed(dentry)) {
  59                 struct sysfs_dirent * sd = dentry->d_fsdata;
  60                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  61                         struct sysfs_symlink * sl = sd->s_element;
  62                         kobj = kobject_get(sl->target_kobj);
  63                 } else
  64                         kobj = kobject_get(sd->s_element);
  65         }
  66         spin_unlock(&dcache_lock);
  67
  68         return kobj;
  69 }
  70
  71 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
  72 {
  73         if (sd->s_type & SYSFS_KOBJ_LINK) {
  74                 struct sysfs_symlink * sl = sd->s_element;
  75                 kfree(sl->link_name);
  76                 kobject_put(sl->target_kobj);
  77                 kfree(sl);
  78         }
  79         kfree(sd->s_iattr);
  80         kmem_cache_free(sysfs_dir_cachep, sd);
  81 }
  82
  83 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
  84 {
  85         if (sd) {
  86                 WARN_ON(!atomic_read(&sd->s_count));
  87                 atomic_inc(&sd->s_count);
  88         }
  89         return sd;
  90 }
  91
  92 static inline void sysfs_put(struct sysfs_dirent * sd)
  93 {
  94         if (atomic_dec_and_test(&sd->s_count))
  95                 release_sysfs_dirent(sd);
  96 }
  97