15 void set_fs_root(struct fs_struct *fs, const struct path *path)  in set_fs_root()  argument
20 	spin_lock(&fs->lock);  in set_fs_root()
21 	write_seqcount_begin(&fs->seq);  in set_fs_root()
22 	old_root = fs->root;  in set_fs_root()
23 	fs->root = *path;  in set_fs_root()
24 	write_seqcount_end(&fs->seq);  in set_fs_root()
25 	spin_unlock(&fs->lock);  in set_fs_root()
34 void set_fs_pwd(struct fs_struct *fs, const struct path *path)  in set_fs_pwd()  argument
39 	spin_lock(&fs->lock);  in set_fs_pwd()
40 	write_seqcount_begin(&fs->seq);  in set_fs_pwd()
41 	old_pwd = fs->pwd;  in set_fs_pwd()
42 	fs->pwd = *path;  in set_fs_pwd()
43 	write_seqcount_end(&fs->seq);  in set_fs_pwd()
44 	spin_unlock(&fs->lock);  in set_fs_pwd()
61 	struct fs_struct *fs;  in chroot_fs_refs()  local
67 		fs = p->fs;  in chroot_fs_refs()
68 		if (fs) {  in chroot_fs_refs()
70 			spin_lock(&fs->lock);  in chroot_fs_refs()
71 			write_seqcount_begin(&fs->seq);  in chroot_fs_refs()
72 			hits += replace_path(&fs->root, old_root, new_root);  in chroot_fs_refs()
73 			hits += replace_path(&fs->pwd, old_root, new_root);  in chroot_fs_refs()
74 			write_seqcount_end(&fs->seq);  in chroot_fs_refs()
79 			spin_unlock(&fs->lock);  in chroot_fs_refs()
88 void free_fs_struct(struct fs_struct *fs)  in free_fs_struct()  argument
90 	path_put(&fs->root);  in free_fs_struct()
91 	path_put(&fs->pwd);  in free_fs_struct()
92 	kmem_cache_free(fs_cachep, fs);  in free_fs_struct()
97 	struct fs_struct *fs = tsk->fs;  in exit_fs()  local
99 	if (fs) {  in exit_fs()
102 		spin_lock(&fs->lock);  in exit_fs()
103 		tsk->fs = NULL;  in exit_fs()
104 		kill = !--fs->users;  in exit_fs()
105 		spin_unlock(&fs->lock);  in exit_fs()
108 			free_fs_struct(fs);  in exit_fs()
114 	struct fs_struct *fs = kmem_cache_alloc(fs_cachep, GFP_KERNEL);  in copy_fs_struct()  local
116 	if (fs) {  in copy_fs_struct()
117 		fs->users = 1;  in copy_fs_struct()
118 		fs->in_exec = 0;  in copy_fs_struct()
119 		spin_lock_init(&fs->lock);  in copy_fs_struct()
120 		seqcount_spinlock_init(&fs->seq, &fs->lock);  in copy_fs_struct()
121 		fs->umask = old->umask;  in copy_fs_struct()
124 		fs->root = old->root;  in copy_fs_struct()
125 		path_get(&fs->root);  in copy_fs_struct()
126 		fs->pwd = old->pwd;  in copy_fs_struct()
127 		path_get(&fs->pwd);  in copy_fs_struct()
130 	return fs;  in copy_fs_struct()
135 	struct fs_struct *fs = current->fs;  in unshare_fs_struct()  local
136 	struct fs_struct *new_fs = copy_fs_struct(fs);  in unshare_fs_struct()
143 	spin_lock(&fs->lock);  in unshare_fs_struct()
144 	kill = !--fs->users;  in unshare_fs_struct()
145 	current->fs = new_fs;  in unshare_fs_struct()
146 	spin_unlock(&fs->lock);  in unshare_fs_struct()
150 		free_fs_struct(fs);  in unshare_fs_struct()
158 	return current->fs->umask;  in current_umask()