1 2 extern struct vfsmount * sysfs_mount; 3 extern kmem_cache_t *sysfs_dir_cachep; 4 5 extern struct inode * sysfs_new_inode(mode_t mode, struct sysfs_dirent *); 6 extern int sysfs_create(struct dentry *, int mode, int (*init)(struct inode *)); 7 8 extern int sysfs_make_dirent(struct sysfs_dirent *, struct dentry *, void *, 9 umode_t, int); 10 extern struct dentry * sysfs_get_dentry(struct dentry *, const char *); 11 12 extern int sysfs_add_file(struct dentry *, const struct attribute *, int); 13 extern void sysfs_hash_and_remove(struct dentry * dir, const char * name); 14 15 extern int sysfs_create_subdir(struct kobject *, const char *, struct dentry **); 16 extern void sysfs_remove_subdir(struct dentry *); 17 18 extern const unsigned char * sysfs_get_name(struct sysfs_dirent *sd); 19 extern void sysfs_drop_dentry(struct sysfs_dirent *sd, struct dentry *parent); 20 extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 21 22 extern struct rw_semaphore sysfs_rename_sem; 23 extern struct super_block * sysfs_sb; 24 extern struct file_operations sysfs_dir_operations; 25 extern struct file_operations sysfs_file_operations; 26 extern struct file_operations bin_fops; 27 extern struct inode_operations sysfs_dir_inode_operations; 28 extern struct inode_operations sysfs_symlink_inode_operations; 29 30 struct sysfs_symlink { 31 char * link_name; 32 struct kobject * target_kobj; 33 }; 34 35 static inline struct kobject * to_kobj(struct dentry * dentry) 36 { 37 struct sysfs_dirent * sd = dentry->d_fsdata; 38 return ((struct kobject *) sd->s_element); 39 } 40 41 static inline struct attribute * to_attr(struct dentry * dentry) 42 { 43 struct sysfs_dirent * sd = dentry->d_fsdata; 44 return ((struct attribute *) sd->s_element); 45 } 46 47 static inline struct bin_attribute * to_bin_attr(struct dentry * dentry) 48 { 49 struct sysfs_dirent * sd = dentry->d_fsdata; 50 return ((struct bin_attribute *) sd->s_element); 51 } 52 53 static inline struct kobject *sysfs_get_kobject(struct dentry *dentry) 54 { 55 struct kobject * kobj = NULL; 56 57 spin_lock(&dcache_lock); 58 if (!d_unhashed(dentry)) { 59 struct sysfs_dirent * sd = dentry->d_fsdata; 60 if (sd->s_type & SYSFS_KOBJ_LINK) { 61 struct sysfs_symlink * sl = sd->s_element; 62 kobj = kobject_get(sl->target_kobj); 63 } else 64 kobj = kobject_get(sd->s_element); 65 } 66 spin_unlock(&dcache_lock); 67 68 return kobj; 69 } 70 71 static inline void release_sysfs_dirent(struct sysfs_dirent * sd) 72 { 73 if (sd->s_type & SYSFS_KOBJ_LINK) { 74 struct sysfs_symlink * sl = sd->s_element; 75 kfree(sl->link_name); 76 kobject_put(sl->target_kobj); 77 kfree(sl); 78 } 79 kfree(sd->s_iattr); 80 kmem_cache_free(sysfs_dir_cachep, sd); 81 } 82 83 static inline struct sysfs_dirent * sysfs_get(struct sysfs_dirent * sd) 84 { 85 if (sd) { 86 WARN_ON(!atomic_read(&sd->s_count)); 87 atomic_inc(&sd->s_count); 88 } 89 return sd; 90 } 91 92 static inline void sysfs_put(struct sysfs_dirent * sd) 93 { 94 if (atomic_dec_and_test(&sd->s_count)) 95 release_sysfs_dirent(sd); 96 } 97 98