174 lines
4.6 KiB
C
174 lines
4.6 KiB
C
/*
|
|
* 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.
|
|
*/
|
|
|
|
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;
|
|
};
|
|
|
|
/*
|
|
* 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;
|
|
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 iattr *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_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;
|
|
}
|
|
|
|
/*
|
|
* Context structure to be used while adding/removing nodes.
|
|
*/
|
|
struct sysfs_addrm_cxt {
|
|
struct sysfs_dirent *parent_sd;
|
|
struct inode *parent_inode;
|
|
struct sysfs_dirent *removed;
|
|
int cnt;
|
|
};
|
|
|
|
/*
|
|
* 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 struct mutex sysfs_rename_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_two(struct sysfs_dirent *sd);
|
|
void sysfs_put_active_two(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);
|
|
|
|
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_setattr(struct dentry *dentry, struct iattr *iattr);
|
|
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;
|