1 /* 2 * fs/sysfs/sysfs.h - sysfs internal header file 3 * 4 * Copyright (c) 2001-3 Patrick Mochel 5 * Copyright (c) 2007 SUSE Linux Products GmbH 6 * Copyright (c) 2007 Tejun Heo <teheo@suse.de> 7 * 8 * This file is released under the GPLv2. 9 */ 10 11 #include <linux/fs.h> 12 13 struct sysfs_open_dirent; 14 15 /* type-specific structures for sysfs_dirent->s_* union members */ 16 struct sysfs_elem_dir { 17 struct kobject *kobj; 18 /* children list starts here and goes through sd->s_sibling */ 19 struct sysfs_dirent *children; 20 }; 21 22 struct sysfs_elem_symlink { 23 struct sysfs_dirent *target_sd; 24 }; 25 26 struct sysfs_elem_attr { 27 struct attribute *attr; 28 struct sysfs_open_dirent *open; 29 }; 30 31 struct sysfs_elem_bin_attr { 32 struct bin_attribute *bin_attr; 33 struct hlist_head buffers; 34 }; 35 36 struct sysfs_inode_attrs { 37 struct iattr ia_iattr; 38 void *ia_secdata; 39 u32 ia_secdata_len; 40 }; 41 42 /* 43 * sysfs_dirent - the building block of sysfs hierarchy. Each and 44 * every sysfs node is represented by single sysfs_dirent. 45 * 46 * As long as s_count reference is held, the sysfs_dirent itself is 47 * accessible. Dereferencing s_elem or any other outer entity 48 * requires s_active reference. 49 */ 50 struct sysfs_dirent { 51 atomic_t s_count; 52 atomic_t s_active; 53 struct sysfs_dirent *s_parent; 54 struct sysfs_dirent *s_sibling; 55 const char *s_name; 56 57 union { 58 struct sysfs_elem_dir s_dir; 59 struct sysfs_elem_symlink s_symlink; 60 struct sysfs_elem_attr s_attr; 61 struct sysfs_elem_bin_attr s_bin_attr; 62 }; 63 64 unsigned int s_flags; 65 ino_t s_ino; 66 umode_t s_mode; 67 struct sysfs_inode_attrs *s_iattr; 68 }; 69 70 #define SD_DEACTIVATED_BIAS INT_MIN 71 72 #define SYSFS_TYPE_MASK 0x00ff 73 #define SYSFS_DIR 0x0001 74 #define SYSFS_KOBJ_ATTR 0x0002 75 #define SYSFS_KOBJ_BIN_ATTR 0x0004 76 #define SYSFS_KOBJ_LINK 0x0008 77 #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) 78 79 #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK 80 #define SYSFS_FLAG_REMOVED 0x0200 81 82 static inline unsigned int sysfs_type(struct sysfs_dirent *sd) 83 { 84 return sd->s_flags & SYSFS_TYPE_MASK; 85 } 86 87 /* 88 * Context structure to be used while adding/removing nodes. 89 */ 90 struct sysfs_addrm_cxt { 91 struct sysfs_dirent *parent_sd; 92 struct inode *parent_inode; 93 struct sysfs_dirent *removed; 94 int cnt; 95 }; 96 97 /* 98 * mount.c 99 */ 100 extern struct sysfs_dirent sysfs_root; 101 extern struct super_block *sysfs_sb; 102 extern struct kmem_cache *sysfs_dir_cachep; 103 104 /* 105 * dir.c 106 */ 107 extern struct mutex sysfs_mutex; 108 extern struct mutex sysfs_rename_mutex; 109 extern spinlock_t sysfs_assoc_lock; 110 111 extern const struct file_operations sysfs_dir_operations; 112 extern const struct inode_operations sysfs_dir_inode_operations; 113 114 struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); 115 struct sysfs_dirent *sysfs_get_active_two(struct sysfs_dirent *sd); 116 void sysfs_put_active_two(struct sysfs_dirent *sd); 117 void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt, 118 struct sysfs_dirent *parent_sd); 119 int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); 120 int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); 121 void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); 122 void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); 123 124 struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, 125 const unsigned char *name); 126 struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, 127 const unsigned char *name); 128 struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); 129 130 void release_sysfs_dirent(struct sysfs_dirent *sd); 131 132 int sysfs_create_subdir(struct kobject *kobj, const char *name, 133 struct sysfs_dirent **p_sd); 134 void sysfs_remove_subdir(struct sysfs_dirent *sd); 135 136 static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd) 137 { 138 if (sd) { 139 WARN_ON(!atomic_read(&sd->s_count)); 140 atomic_inc(&sd->s_count); 141 } 142 return sd; 143 } 144 #define sysfs_get(sd) __sysfs_get(sd) 145 146 static inline void __sysfs_put(struct sysfs_dirent *sd) 147 { 148 if (sd && atomic_dec_and_test(&sd->s_count)) 149 release_sysfs_dirent(sd); 150 } 151 #define sysfs_put(sd) __sysfs_put(sd) 152 153 /* 154 * inode.c 155 */ 156 struct inode *sysfs_get_inode(struct sysfs_dirent *sd); 157 void sysfs_delete_inode(struct inode *inode); 158 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); 159 int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value, 160 size_t size, int flags); 161 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name); 162 int sysfs_inode_init(void); 163 164 /* 165 * file.c 166 */ 167 extern const struct file_operations sysfs_file_operations; 168 169 int sysfs_add_file(struct sysfs_dirent *dir_sd, 170 const struct attribute *attr, int type); 171 172 int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, 173 const struct attribute *attr, int type, mode_t amode); 174 /* 175 * bin.c 176 */ 177 extern const struct file_operations bin_fops; 178 void unmap_bin_file(struct sysfs_dirent *attr_sd); 179 180 /* 181 * symlink.c 182 */ 183 extern const struct inode_operations sysfs_symlink_inode_operations; 184