fs/sysfs/sysfs.h

   1 struct sysfs_dirent {
   2         atomic_t                s_count;
   3         struct list_head        s_sibling;
   4         struct list_head        s_children;
   5         void                    * s_element;
   6         int                     s_type;
   7         umode_t                 s_mode;
   8         ino_t                   s_ino;
   9         struct dentry           * s_dentry;
  10         struct iattr            * s_iattr;
  11         atomic_t                s_event;
  12 };
  13
  14 extern struct vfsmount * sysfs_mount;
  15 extern struct kmem_cache *sysfs_dir_cachep;
  16
  17 extern void sysfs_delete_inode(struct inode *inode);
  18 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
  19 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
  20
  21 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
  22 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *,
  23                                 umode_t, int);
  24
  25 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  26 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  27 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  28
  29 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  30 extern void sysfs_remove_subdir(struct dentry *);
  31
  32 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd);
  33 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
  34 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  35
  36 extern struct rw_semaphore sysfs_rename_sem;
  37 extern struct super_block * sysfs_sb;
  38 extern const struct file_operations sysfs_dir_operations;
  39 extern const struct file_operations sysfs_file_operations;
  40 extern const struct file_operations bin_fops;
  41 extern const struct inode_operations sysfs_dir_inode_operations;
  42 extern const struct inode_operations sysfs_symlink_inode_operations;
  43
  44 struct sysfs_symlink {
  45         char * link_name;
  46         struct kobject * target_kobj;
  47 };
  48
  49 struct sysfs_buffer {
  50         struct list_head                associates;
  51         size_t                          count;
  52         loff_t                          pos;
  53         char                            * page;
  54         struct sysfs_ops                * ops;
  55         struct semaphore                sem;
  56         int                             orphaned;
  57         int                             needs_read_fill;
  58         int                             event;
  59 };
  60
  61 struct sysfs_buffer_collection {
  62         struct list_head        associates;
  63 };
  64
  65 static inline struct kobject * to_kobj(struct dentry * dentry)
  66 {
  67         struct sysfs_dirent * sd = dentry->d_fsdata;
  68         return ((struct kobject *) sd->s_element);
  69 }
  70
  71 static inline struct attribute * to_attr(struct dentry * dentry)
  72 {
  73         struct sysfs_dirent * sd = dentry->d_fsdata;
  74         return ((struct attribute *) sd->s_element);
  75 }
  76
  77 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  78 {
  79         struct sysfs_dirent * sd = dentry->d_fsdata;
  80         return ((struct bin_attribute *) sd->s_element);
  81 }
  82
  83 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  84 {
  85         struct kobject * kobj = NULL;
  86
  87         spin_lock(&dcache_lock);
  88         if (!d_unhashed(dentry)) {
  89                 struct sysfs_dirent * sd = dentry->d_fsdata;
  90                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  91                         struct sysfs_symlink * sl = sd->s_element;
  92                         kobj = kobject_get(sl->target_kobj);
  93                 } else
  94                         kobj = kobject_get(sd->s_element);
  95         }
  96         spin_unlock(&dcache_lock);
  97
  98         return kobj;
  99 }
 100
 101 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
 102 {
 103         if (sd->s_type & SYSFS_KOBJ_LINK) {
 104                 struct sysfs_symlink * sl = sd->s_element;
 105                 kfree(sl->link_name);
 106                 kobject_put(sl->target_kobj);
 107                 kfree(sl);
 108         }
 109         kfree(sd->s_iattr);
 110         kmem_cache_free(sysfs_dir_cachep, sd);
 111 }
 112
 113 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 114 {
 115         if (sd) {
 116                 WARN_ON(!atomic_read(&sd->s_count));
 117                 atomic_inc(&sd->s_count);
 118         }
 119         return sd;
 120 }
 121
 122 static inline void sysfs_put(struct sysfs_dirent * sd)
 123 {
 124         if (atomic_dec_and_test(&sd->s_count))
 125                 release_sysfs_dirent(sd);
 126 }
 127
 128 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 129 {
 130         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 131 }