include/linux/fs_struct.h

   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
   8 struct 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
  17 extern struct kmem_cache *fs_cachep;
  18
  19 extern void exit_fs(struct task_struct *);
  20 extern void set_fs_root(struct fs_struct *, struct path *);
  21 extern void set_fs_pwd(struct fs_struct *, struct path *);
  22 extern struct fs_struct *copy_fs_struct(struct fs_struct *);
  23 extern void free_fs_struct(struct fs_struct *);
  24 extern void daemonize_fs_struct(void);
  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 static 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 */