include/linux/fs_struct.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_FS_STRUCT_H
   3 #define _LINUX_FS_STRUCT_H
   4
   5 #include <linux/path.h>
   6 #include <linux/spinlock.h>
   7 #include <linux/seqlock.h>
   8
   9 struct fs_struct {
  10         int users;
  11         spinlock_t lock;
  12         seqcount_t seq;
  13         int umask;
  14         int in_exec;
  15         struct path root, pwd;
  16 } __randomize_layout;
  17
  18 extern struct kmem_cache *fs_cachep;
  19
  20 extern void exit_fs(struct task_struct *);
  21 extern void set_fs_root(struct fs_struct *, const struct path *);
  22 extern void set_fs_pwd(struct fs_struct *, const struct path *);
  23 extern struct fs_struct *copy_fs_struct(struct fs_struct *);
  24 extern void free_fs_struct(struct fs_struct *);
  25 extern int unshare_fs_struct(void);
  26
  27 static 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
  35 static 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
  43 extern bool current_chrooted(void);
  44
  45 #endif /* _LINUX_FS_STRUCT_H */