root/include/linux/fs_struct.h

DEFINITIONS

1. get_fs_root
2. get_fs_pwd

#ifndef _LINUX_FS_STRUCT_H
#define _LINUX_FS_STRUCT_H

#include <linux/path.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>

struct fs_struct {
        int users;
        spinlock_t lock;
        seqcount_t seq;
        int umask;
        int in_exec;
        struct path root, pwd;
};

extern struct kmem_cache *fs_cachep;

extern void exit_fs(struct task_struct *);
extern void set_fs_root(struct fs_struct *, const struct path *);
extern void set_fs_pwd(struct fs_struct *, const struct path *);
extern struct fs_struct *copy_fs_struct(struct fs_struct *);
extern void free_fs_struct(struct fs_struct *);
extern int unshare_fs_struct(void);

static inline void get_fs_root(struct fs_struct *fs, struct path *root)
{
        spin_lock(&fs->lock);
        *root = fs->root;
        path_get(root);
        spin_unlock(&fs->lock);
}

static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
{
        spin_lock(&fs->lock);
        *pwd = fs->pwd;
        path_get(pwd);
        spin_unlock(&fs->lock);
}

extern bool current_chrooted(void);

#endif /* _LINUX_FS_STRUCT_H */