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/*
* fs/kernfs/kernfs-internal.h - kernfs internal header file
*
* Copyright (c) 2001-3 Patrick Mochel
* Copyright (c) 2007 SUSE Linux Products GmbH
* Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
*
* This file is released under the GPLv2.
*/
#ifndef __KERNFS_INTERNAL_H
#define __KERNFS_INTERNAL_H
#include <linux/lockdep.h>
#include <linux/fs.h>
#include <linux/rbtree.h>
#include <linux/mutex.h>
#include <linux/kernfs.h>
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;
/*
* The kernfs hierarchy this directory belongs to. This fits
* better directly in sysfs_dirent but is here to save space.
*/
struct kernfs_root *root;
};
struct sysfs_elem_symlink {
struct sysfs_dirent *target_sd;
};
struct sysfs_elem_attr {
const struct kernfs_ops *ops;
struct sysfs_open_dirent *open;
loff_t size;
};
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 0x000f
#define SYSFS_DIR 0x0001
#define SYSFS_KOBJ_ATTR 0x0002
#define SYSFS_KOBJ_LINK 0x0004
#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
#define SYSFS_ACTIVE_REF SYSFS_KOBJ_ATTR
#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
#define SYSFS_FLAG_REMOVED 0x0010
#define SYSFS_FLAG_NS 0x0020
#define SYSFS_FLAG_HAS_SEQ_SHOW 0x0040
#define SYSFS_FLAG_HAS_MMAP 0x0080
#define SYSFS_FLAG_LOCKDEP 0x0100
static inline unsigned int sysfs_type(struct sysfs_dirent *sd)
{
return sd->s_flags & SYSFS_TYPE_MASK;
}
/**
* kernfs_root - find out the kernfs_root a sysfs_dirent belongs to
* @sd: sysfs_dirent of interest
*
* Return the kernfs_root @sd belongs to.
*/
static inline struct kernfs_root *kernfs_root(struct sysfs_dirent *sd)
{
/* if parent exists, it's always a dir; otherwise, @sd is a dir */
if (sd->s_parent)
sd = sd->s_parent;
return sd->s_dir.root;
}
/*
* Context structure to be used while adding/removing nodes.
*/
struct sysfs_addrm_cxt {
struct sysfs_dirent *removed;
};
#include "../sysfs/sysfs.h"
/*
* mount.c
*/
struct sysfs_super_info {
/*
* The root associated with this super_block. Each super_block is
* identified by the root and ns it's associated with.
*/
struct kernfs_root *root;
/*
* 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.
*/
const void *ns;
};
#define sysfs_info(SB) ((struct sysfs_super_info *)(SB->s_fs_info))
extern struct kmem_cache *sysfs_dir_cachep;
/*
* 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);
void sysfs_inode_init(void);
/*
* dir.c
*/
extern struct mutex sysfs_mutex;
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);
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_new_dirent(struct kernfs_root *root,
const char *name, umode_t mode, int type);
/*
* file.c
*/
extern const struct file_operations kernfs_file_operations;
void sysfs_unmap_bin_file(struct sysfs_dirent *sd);
/*
* symlink.c
*/
extern const struct inode_operations sysfs_symlink_inode_operations;
#endif /* __KERNFS_INTERNAL_H */
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