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 *, const struct path *);
  21 extern void set_fs_pwd(struct fs_struct *, const struct path *);
  22 extern struct fs_struct *copy_fs_struct(struct fs_struct *);
  23 extern void free_fs_struct(struct fs_struct *);
  24 extern int unshare_fs_struct(void);
  25
  26 static inline void get_fs_root(struct fs_struct *fs, struct path *root)
  27 {
  28         spin_lock(&fs->lock);
  29         *root = fs->root;
  30         path_get(root);
  31         spin_unlock(&fs->lock);
  32 }
  33
  34 static inline void get_fs_pwd(struct fs_struct *fs, struct path *pwd)
  35 {
  36         spin_lock(&fs->lock);
  37         *pwd = fs->pwd;
  38         path_get(pwd);
  39         spin_unlock(&fs->lock);
  40 }
  41
  42 static inline void get_fs_root_and_pwd(struct fs_struct *fs, struct path *root,
  43                                        struct path *pwd)
  44 {
  45         spin_lock(&fs->lock);
  46         *root = fs->root;
  47         path_get(root);
  48         *pwd = fs->pwd;
  49         path_get(pwd);
  50         spin_unlock(&fs->lock);
  51 }
  52
  53 #endif /* _LINUX_FS_STRUCT_H */