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