fs/sysfs/sysfs.h

   1 struct sysfs_elem_dir {
   2         struct kobject          * kobj;
   3 };
   4
   5 struct sysfs_elem_symlink {
   6         struct sysfs_dirent     * target_sd;
   7 };
   8
   9 struct sysfs_elem_attr {
  10         struct attribute        * attr;
  11 };
  12
  13 struct sysfs_elem_bin_attr {
  14         struct bin_attribute    * bin_attr;
  15 };
  16
  17 struct sysfs_dirent {
  18         atomic_t                s_count;
  19         struct sysfs_dirent     * s_parent;
  20         struct list_head        s_sibling;
  21         struct list_head        s_children;
  22         const char              * s_name;
  23
  24         union {
  25                 struct sysfs_elem_dir           dir;
  26                 struct sysfs_elem_symlink       symlink;
  27                 struct sysfs_elem_attr          attr;
  28                 struct sysfs_elem_bin_attr      bin_attr;
  29         }                       s_elem;
  30
  31         int                     s_type;
  32         umode_t                 s_mode;
  33         ino_t                   s_ino;
  34         struct dentry           * s_dentry;
  35         struct iattr            * s_iattr;
  36         atomic_t                s_event;
  37 };
  38
  39 extern struct vfsmount * sysfs_mount;
  40 extern struct kmem_cache *sysfs_dir_cachep;
  41
  42 extern void sysfs_delete_inode(struct inode *inode);
  43 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *);
  44 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *));
  45
  46 extern void release_sysfs_dirent(struct sysfs_dirent * sd);
  47 extern int sysfs_dirent_exist(struct sysfs_dirent *, const unsigned char *);
  48 extern struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode,
  49                                              int type);
  50 extern void sysfs_attach_dirent(struct sysfs_dirent *sd,
  51                                 struct sysfs_dirent *parent_sd,
  52                                 struct dentry *dentry);
  53
  54 extern int sysfs_add_file(struct dentry *, const struct attribute *, int);
  55 extern int sysfs_hash_and_remove(struct dentry * dir, const char * name);
  56 extern struct sysfs_dirent *sysfs_find(struct sysfs_dirent *dir, const char * name);
  57
  58 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **);
  59 extern void sysfs_remove_subdir(struct dentry *);
  60
  61 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent);
  62 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
  63
  64 extern spinlock_t sysfs_lock;
  65 extern spinlock_t kobj_sysfs_assoc_lock;
  66 extern struct rw_semaphore sysfs_rename_sem;
  67 extern struct super_block * sysfs_sb;
  68 extern const struct file_operations sysfs_dir_operations;
  69 extern const struct file_operations sysfs_file_operations;
  70 extern const struct file_operations bin_fops;
  71 extern const struct inode_operations sysfs_dir_inode_operations;
  72 extern const struct inode_operations sysfs_symlink_inode_operations;
  73
  74 struct sysfs_buffer {
  75         struct list_head                associates;
  76         size_t                          count;
  77         loff_t                          pos;
  78         char                            * page;
  79         struct sysfs_ops                * ops;
  80         struct semaphore                sem;
  81         int                             orphaned;
  82         int                             needs_read_fill;
  83         int                             event;
  84 };
  85
  86 struct sysfs_buffer_collection {
  87         struct list_head        associates;
  88 };
  89
  90 static inline struct kobject * to_kobj(struct dentry * dentry)
  91 {
  92         struct sysfs_dirent * sd = dentry->d_fsdata;
  93         return sd->s_elem.dir.kobj;
  94 }
  95
  96 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry)
  97 {
  98         struct kobject * kobj = NULL;
  99
 100         spin_lock(&dcache_lock);
 101         if (!d_unhashed(dentry)) {
 102                 struct sysfs_dirent * sd = dentry->d_fsdata;
 103
 104                 if (sd->s_type & SYSFS_KOBJ_LINK)
 105                         sd = sd->s_elem.symlink.target_sd;
 106
 107                 kobj = kobject_get(sd->s_elem.dir.kobj);
 108         }
 109         spin_unlock(&dcache_lock);
 110
 111         return kobj;
 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 (sd && 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 }