| /* |
| * fs/sysfs/sysfs.h - sysfs internal header file |
| * |
| * Copyright (c) 2001-3 Patrick Mochel |
| * Copyright (c) 2007 SUSE Linux Products GmbH |
| * Copyright (c) 2007 Tejun Heo <teheo@suse.de> |
| * |
| * This file is released under the GPLv2. |
| */ |
| |
| #include <linux/lockdep.h> |
| #include <linux/kobject_ns.h> |
| #include <linux/fs.h> |
| #include <linux/rbtree.h> |
| |
| struct sysfs_open_dirent; |
| |
| /* type-specific structures for sysfs_dirent->s_* union members */ |
| struct sysfs_elem_dir { |
| struct kobject *kobj; |
| |
| unsigned long subdirs; |
| /* children rbtree starts here and goes through sd->s_rb */ |
| struct rb_root children; |
| }; |
| |
| struct sysfs_elem_symlink { |
| struct sysfs_dirent *target_sd; |
| }; |
| |
| struct sysfs_elem_attr { |
| struct attribute *attr; |
| struct sysfs_open_dirent *open; |
| }; |
| |
| struct sysfs_elem_bin_attr { |
| struct bin_attribute *bin_attr; |
| struct hlist_head buffers; |
| }; |
| |
| struct sysfs_inode_attrs { |
| struct iattr ia_iattr; |
| void *ia_secdata; |
| u32 ia_secdata_len; |
| }; |
| |
| /* |
| * sysfs_dirent - the building block of sysfs hierarchy. Each and |
| * every sysfs node is represented by single sysfs_dirent. |
| * |
| * As long as s_count reference is held, the sysfs_dirent itself is |
| * accessible. Dereferencing s_elem or any other outer entity |
| * requires s_active reference. |
| */ |
| struct sysfs_dirent { |
| atomic_t s_count; |
| atomic_t s_active; |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| struct lockdep_map dep_map; |
| #endif |
| struct sysfs_dirent *s_parent; |
| const char *s_name; |
| |
| struct rb_node s_rb; |
| |
| union { |
| struct completion *completion; |
| struct sysfs_dirent *removed_list; |
| } u; |
| |
| const void *s_ns; /* namespace tag */ |
| unsigned int s_hash; /* ns + name hash */ |
| union { |
| struct sysfs_elem_dir s_dir; |
| struct sysfs_elem_symlink s_symlink; |
| struct sysfs_elem_attr s_attr; |
| struct sysfs_elem_bin_attr s_bin_attr; |
| }; |
| |
| unsigned short s_flags; |
| umode_t s_mode; |
| unsigned int s_ino; |
| struct sysfs_inode_attrs *s_iattr; |
| }; |
| |
| #define SD_DEACTIVATED_BIAS INT_MIN |
| |
| #define SYSFS_TYPE_MASK 0x00ff |
| #define SYSFS_DIR 0x0001 |
| #define SYSFS_KOBJ_ATTR 0x0002 |
| #define SYSFS_KOBJ_BIN_ATTR 0x0004 |
| #define SYSFS_KOBJ_LINK 0x0008 |
| #define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK) |
| #define SYSFS_ACTIVE_REF (SYSFS_KOBJ_ATTR | SYSFS_KOBJ_BIN_ATTR) |
| |
| #define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK |
| #define SYSFS_FLAG_HAS_NS 0x01000 |
| #define SYSFS_FLAG_REMOVED 0x02000 |
| |
| static inline unsigned int sysfs_type(struct sysfs_dirent *sd) |
| { |
| return sd->s_flags & SYSFS_TYPE_MASK; |
| } |
| |
| #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| |
| #define sysfs_dirent_init_lockdep(sd) \ |
| do { \ |
| struct attribute *attr = sd->s_attr.attr; \ |
| struct lock_class_key *key = attr->key; \ |
| if (!key) \ |
| key = &attr->skey; \ |
| \ |
| lockdep_init_map(&sd->dep_map, "s_active", key, 0); \ |
| } while (0) |
| |
| /* Test for attributes that want to ignore lockdep for read-locking */ |
| static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd) |
| { |
| return sysfs_type(sd) == SYSFS_KOBJ_ATTR && |
| sd->s_attr.attr->ignore_lockdep; |
| } |
| |
| #else |
| |
| #define sysfs_dirent_init_lockdep(sd) do {} while (0) |
| |
| static inline bool sysfs_ignore_lockdep(struct sysfs_dirent *sd) |
| { |
| return true; |
| } |
| |
| #endif |
| |
| /* |
| * Context structure to be used while adding/removing nodes. |
| */ |
| struct sysfs_addrm_cxt { |
| struct sysfs_dirent *removed; |
| }; |
| |
| /* |
| * mount.c |
| */ |
| |
| /* |
| * Each sb is associated with one namespace tag, currently the network |
| * namespace of the task which mounted this sysfs instance. If multiple |
| * tags become necessary, make the following an array and compare |
| * sysfs_dirent tag against every entry. |
| */ |
| struct sysfs_super_info { |
| void *ns; |
| }; |
| #define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info)) |
| extern struct sysfs_dirent sysfs_root; |
| extern struct kmem_cache *sysfs_dir_cachep; |
| |
| /* |
| * dir.c |
| */ |
| extern struct mutex sysfs_mutex; |
| extern spinlock_t sysfs_assoc_lock; |
| extern const struct dentry_operations sysfs_dentry_ops; |
| |
| extern const struct file_operations sysfs_dir_operations; |
| extern const struct inode_operations sysfs_dir_inode_operations; |
| |
| struct dentry *sysfs_get_dentry(struct sysfs_dirent *sd); |
| struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd); |
| void sysfs_put_active(struct sysfs_dirent *sd); |
| void sysfs_addrm_start(struct sysfs_addrm_cxt *acxt); |
| int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd, |
| struct sysfs_dirent *parent_sd); |
| int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd, |
| struct sysfs_dirent *parent_sd); |
| void __sysfs_remove(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); |
| void sysfs_remove(struct sysfs_dirent *sd); |
| void sysfs_addrm_finish(struct sysfs_addrm_cxt *acxt); |
| |
| struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd, |
| const unsigned char *name, |
| const void *ns); |
| struct sysfs_dirent *sysfs_new_dirent(const char *name, umode_t mode, int type); |
| |
| void release_sysfs_dirent(struct sysfs_dirent *sd); |
| |
| int sysfs_create_subdir(struct kobject *kobj, const char *name, |
| struct sysfs_dirent **p_sd); |
| |
| int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd, |
| const char *new_name, const void *new_ns); |
| |
| static inline struct sysfs_dirent *__sysfs_get(struct sysfs_dirent *sd) |
| { |
| if (sd) { |
| WARN_ON(!atomic_read(&sd->s_count)); |
| atomic_inc(&sd->s_count); |
| } |
| return sd; |
| } |
| #define sysfs_get(sd) __sysfs_get(sd) |
| |
| static inline void __sysfs_put(struct sysfs_dirent *sd) |
| { |
| if (sd && atomic_dec_and_test(&sd->s_count)) |
| release_sysfs_dirent(sd); |
| } |
| #define sysfs_put(sd) __sysfs_put(sd) |
| |
| /* |
| * inode.c |
| */ |
| struct inode *sysfs_get_inode(struct super_block *sb, struct sysfs_dirent *sd); |
| void sysfs_evict_inode(struct inode *inode); |
| int sysfs_sd_setattr(struct sysfs_dirent *sd, struct iattr *iattr); |
| int sysfs_permission(struct inode *inode, int mask); |
| int sysfs_setattr(struct dentry *dentry, struct iattr *iattr); |
| int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
| struct kstat *stat); |
| int sysfs_setxattr(struct dentry *dentry, const char *name, const void *value, |
| size_t size, int flags); |
| int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name, |
| const void *ns); |
| int sysfs_inode_init(void); |
| |
| /* |
| * file.c |
| */ |
| extern const struct file_operations sysfs_file_operations; |
| extern const struct file_operations sysfs_bin_operations; |
| |
| int sysfs_add_file(struct sysfs_dirent *dir_sd, |
| const struct attribute *attr, int type); |
| |
| int sysfs_add_file_mode_ns(struct sysfs_dirent *dir_sd, |
| const struct attribute *attr, int type, |
| umode_t amode, const void *ns); |
| void sysfs_unmap_bin_file(struct sysfs_dirent *sd); |
| |
| /* |
| * symlink.c |
| */ |
| extern const struct inode_operations sysfs_symlink_inode_operations; |
| int sysfs_create_link_sd(struct sysfs_dirent *sd, struct kobject *target, |
| const char *name); |