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