{
__u64 cno;
int ret;
+ struct the_nilfs *nilfs;
ret = nilfs_construct_segment(inode->i_sb);
if (ret < 0)
return ret;
if (argp != NULL) {
- cno = NILFS_SB(inode->i_sb)->s_nilfs->ns_cno - 1;
+ nilfs = NILFS_SB(inode->i_sb)->s_nilfs;
+ down_read(&nilfs->ns_segctor_sem);
+ cno = nilfs->ns_cno - 1;
+ up_read(&nilfs->ns_segctor_sem);
if (copy_to_user(argp, &cno, sizeof(cno)))
return -EFAULT;
}