/* * 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 * * This file is released under the GPLv2. */ #include #include #include #include struct sysfs_open_dirent; /* type-specific structures for sysfs_dirent->s_* union members */ struct sysfs_elem_dir { 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 { const struct kernfs_ops *ops; struct sysfs_open_dirent *open; }; 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; }; void *priv; 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_NS 0x01000 #define SYSFS_FLAG_REMOVED 0x02000 #define SYSFS_FLAG_HAS_SEQ_SHOW 0x04000 #define SYSFS_FLAG_HAS_MMAP 0x08000 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->priv; \ 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) { struct attribute *attr = sd->priv; int type = sysfs_type(sd); return (type == SYSFS_KOBJ_ATTR || type == SYSFS_KOBJ_BIN_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_symlink_target_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 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); void sysfs_warn_dup(struct sysfs_dirent *parent, const char *name); 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_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); 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_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_inode_init(void); /* * file.c */ extern const struct file_operations kernfs_file_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);