release/src-rt-6.x/linux/linux-2.6/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 int sysfs_inode_init(void);
  36
  37 extern spinlock_t sysfs_lock;
  38 extern struct rw_semaphore sysfs_rename_sem;
  39 extern struct super_block * sysfs_sb;
  40 extern const struct file_operations sysfs_dir_operations;
  41 extern const struct file_operations sysfs_file_operations;
  42 extern const struct file_operations bin_fops;
  43 extern const struct inode_operations sysfs_dir_inode_operations;
  44 extern const struct inode_operations sysfs_symlink_inode_operations;
  45
  46 struct sysfs_symlink {
  47         char * link_name;
  48         struct kobject * target_kobj;
  49 };
  50
  51 struct sysfs_buffer {
  52         struct list_head                associates;
  53         size_t                          count;
  54         loff_t                          pos;
  55         char                            * page;
  56         struct sysfs_ops                * ops;
  57         struct semaphore                sem;
  58         int                             orphaned;
  59         int                             needs_read_fill;
  60         int                             event;
  61 };
  62
  63 struct sysfs_buffer_collection {
  64         struct list_head        associates;
  65 };
  66
  67 static inline struct kobject * to_kobj(struct dentry * dentry)
  68 {
  69         struct sysfs_dirent * sd = dentry->d_fsdata;
  70         return ((struct kobject *) sd->s_element);
  71 }
  72
  73 static inline struct attribute * to_attr(struct dentry * dentry)
  74 {
  75         struct sysfs_dirent * sd = dentry->d_fsdata;
  76         return ((struct attribute *) sd->s_element);
  77 }
  78
  79 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry)
  80 {
  81         struct sysfs_dirent * sd = dentry->d_fsdata;
  82         return ((struct bin_attribute *) sd->s_element);
  83 }
  84
  85 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  86 {
  87         struct kobject * kobj = NULL;
  88
  89         spin_lock(&dcache_lock);
  90         if (!d_unhashed(dentry)) {
  91                 struct sysfs_dirent * sd = dentry->d_fsdata;
  92                 if (sd->s_type & SYSFS_KOBJ_LINK) {
  93                         struct sysfs_symlink * sl = sd->s_element;
  94                         kobj = kobject_get(sl->target_kobj);
  95                 } else
  96                         kobj = kobject_get(sd->s_element);
  97         }
  98         spin_unlock(&dcache_lock);
  99
 100         return kobj;
 101 }
 102
 103 static inline void release_sysfs_dirent(struct sysfs_dirent * sd)
 104 {
 105         if (sd->s_type & SYSFS_KOBJ_LINK) {
 106                 struct sysfs_symlink * sl = sd->s_element;
 107                 kfree(sl->link_name);
 108                 kobject_put(sl->target_kobj);
 109                 kfree(sl);
 110         }
 111         kfree(sd->s_iattr);
 112         kmem_cache_free(sysfs_dir_cachep, sd);
 113 }
 114
 115 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd)
 116 {
 117         if (sd) {
 118                 WARN_ON(!atomic_read(&sd->s_count));
 119                 atomic_inc(&sd->s_count);
 120         }
 121         return sd;
 122 }
 123
 124 static inline void sysfs_put(struct sysfs_dirent * sd)
 125 {
 126         if (atomic_dec_and_test(&sd->s_count))
 127                 release_sysfs_dirent(sd);
 128 }
 129
 130 static inline int sysfs_is_shadowed_inode(struct inode *inode)
 131 {
 132         return S_ISDIR(inode->i_mode) && inode->i_op->follow_link;
 133 }