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sysfs.h
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/* * 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/fs.h> struct sysfs_open_dirent; /* type-specific structures for sysfs_dirent->s_* union members */ struct sysfs_elem_dir { struct kobject *kobj; /* children list starts here and goes through sd->s_sibling */ struct sysfs_dirent *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; struct sysfs_dirent *s_sibling; const char *s_name; 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 int s_flags; ino_t s_ino; umode_t s_mode; 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_REMOVED 0x0200 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 { \ static struct lock_class_key __key; \ \ lockdep_init_map(&sd->dep_map, "s_active", &__key, 0); \ } while(0) #else #define sysfs_dirent_init_lockdep(sd) do {} while(0) #endif /* * Context structure to be used while adding/removing nodes. */ struct sysfs_addrm_cxt { struct sysfs_dirent *parent_sd; struct sysfs_dirent *removed; }; /* * mount.c */ extern struct sysfs_dirent sysfs_root; extern struct super_block *sysfs_sb; extern struct kmem_cache *sysfs_dir_cachep; /* * dir.c */ extern struct mutex sysfs_mutex; extern spinlock_t sysfs_assoc_lock; 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, struct sysfs_dirent *parent_sd); int __sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); int sysfs_add_one(struct sysfs_addrm_cxt *acxt, struct sysfs_dirent *sd); void sysfs_remove_one(struct sysfs_addrm_cxt *acxt, 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); struct sysfs_dirent *sysfs_get_dirent(struct sysfs_dirent *parent_sd, const unsigned char *name); 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); void sysfs_remove_subdir(struct sysfs_dirent *sd); int sysfs_rename(struct sysfs_dirent *sd, struct sysfs_dirent *new_parent_sd, const char *new_name); 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 sysfs_dirent *sd); void sysfs_delete_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); int sysfs_inode_init(void); /* * file.c */ extern const struct file_operations sysfs_file_operations; int sysfs_add_file(struct sysfs_dirent *dir_sd, const struct attribute *attr, int type); int sysfs_add_file_mode(struct sysfs_dirent *dir_sd, const struct attribute *attr, int type, mode_t amode); /* * bin.c */ extern const struct file_operations bin_fops; void unmap_bin_file(struct sysfs_dirent *attr_sd); /* * symlink.c */ extern const struct inode_operations sysfs_symlink_inode_operations;
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