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_spinlock_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 */ 46