linux/include/linux/fs_struct.h
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   1#ifndef _LINUX_FS_STRUCT_H
   2#define _LINUX_FS_STRUCT_H
   3
   4#include <linux/path.h>
   5#include <linux/spinlock.h>
   6#include <linux/seqlock.h>
   7
   8struct fs_struct {
   9        int users;
  10        spinlock_t lock;
  11        seqcount_t seq;
  12        int umask;
  13        int in_exec;
  14        struct path root, pwd;
  15};
  16
  17extern struct kmem_cache *fs_cachep;
  18
  19extern void exit_fs(struct task_struct *);
  20extern void set_fs_root(struct fs_struct *, struct path *);
  21extern void set_fs_pwd(struct fs_struct *, struct path *);
  22extern struct fs_struct *copy_fs_struct(struct fs_struct *);
  23extern void free_fs_struct(struct fs_struct *);
  24extern void daemonize_fs_struct(void);
  25extern int unshare_fs_struct(void);
  26
  27static inline void get_fs_root(struct fs_struct *fs, struct path *root)
  28{
  29        spin_lock(&fs->lock);
  30        *root = fs->root;
  31        path_get(root);
  32        spin_unlock(&fs->lock);
  33}
  34
  35static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
  36{
  37        spin_lock(&fs->lock);
  38        *pwd = fs->pwd;
  39        path_get(pwd);
  40        spin_unlock(&fs->lock);
  41}
  42
  43static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
  44                                       struct path *pwd)
  45{
  46        spin_lock(&fs->lock);
  47        *root = fs->root;
  48        path_get(root);
  49        *pwd = fs->pwd;
  50        path_get(pwd);
  51        spin_unlock(&fs->lock);
  52}
  53
  54#endif /* _LINUX_FS_STRUCT_H */
  55
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