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