fs/sysfs/sysfs.h

   1
   2 extern struct vfsmount * sysfs_mount;
   3 extern struct kmem_cache *sysfs_dir_cachep;
   4
   5 extern void sysfs_delete_inode(struct inode *inode);
   6 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
   7 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
   8
   9 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
  10 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
  11                                 umode_t, int);
  12
  13 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  14 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  15 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  16
  17 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  18 extern void sysfs_remove_subdir(struct dentry *);
  19
  20 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
  21 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
  22 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  23
  24 extern struct rw_semaphore sysfs_rename_sem;
  25 extern struct super_block * sysfs_sb;
  26 extern const struct file_operations sysfs_dir_operations;
  27 extern const struct file_operations sysfs_file_operations;
  28 extern const struct file_operations bin_fops;
  29 extern struct inode_operations sysfs_dir_inode_operations;
  30 extern struct inode_operations sysfs_symlink_inode_operations;
  31
  32 struct sysfs_symlink {
  33         char * link_name;
  34         struct kobject * target_kobj;
  35 };
  36
  37 struct sysfs_buffer {
  38         struct list_head                associates;
  39         size_t                          count;
  40         loff_t                          pos;
  41         char                            * page;
  42         struct sysfs_ops                * ops;
  43         struct semaphore                sem;
  44         int                             orphaned;
  45         int                             needs_read_fill;
  46         int                             event;
  47 };
  48
  49 struct sysfs_buffer_collection {
  50         struct list_head        associates;
  51 };
  52
  53 static inline struct kobject * to_kobj(struct dentry * dentry)
  54 {
  55         struct sysfs_dirent * sd = dentry->d_fsdata;
  56         return ((struct kobject *) sd->s_element);
  57 }
  58
  59 static inline struct attribute * to_attr(struct dentry * dentry)
  60 {
  61         struct sysfs_dirent * sd = dentry->d_fsdata;
  62         return ((struct attribute *) sd->s_element);
  63 }
  64
  65 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  66 {
  67         struct sysfs_dirent * sd = dentry->d_fsdata;
  68         return ((struct bin_attribute *) sd->s_element);
  69 }
  70
  71 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  72 {
  73         struct kobject * kobj = NULL;
  74
  75         spin_lock(&dcache_lock);
  76         if (!d_unhashed(dentry)) {
  77                 struct sysfs_dirent * sd = dentry->d_fsdata;
  78                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  79                         struct sysfs_symlink * sl = sd->s_element;
  80                         kobj = kobject_get(sl->target_kobj);
  81                 } else
  82                         kobj = kobject_get(sd->s_element);
  83         }
  84         spin_unlock(&dcache_lock);
  85
  86         return kobj;
  87 }
  88
  89 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
  90 {
  91         if (sd->s_type & SYSFS_KOBJ_LINK) {
  92                 struct sysfs_symlink * sl = sd->s_element;
  93                 kfree(sl->link_name);
  94                 kobject_put(sl->target_kobj);
  95                 kfree(sl);
  96         }
  97         kfree(sd->s_iattr);
  98         kmem_cache_free(sysfs_dir_cachep, sd);
  99 }
 100
 101 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 102 {
 103         if (sd) {
 104                 WARN_ON(!atomic_read(&sd->s_count));
 105                 atomic_inc(&sd->s_count);
 106         }
 107         return sd;
 108 }
 109
 110 static inline void sysfs_put(struct sysfs_dirent * sd)
 111 {
 112         if (atomic_dec_and_test(&sd->s_count))
 113                 release_sysfs_dirent(sd);
 114 }
 115
 116 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 117 {
 118         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 119 }