S_NOSEC
inode->i_flags &= ~S_NOSEC;
inode->i_flags &= ~S_NOSEC;
flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
flags |= S_NOSEC;
inode->i_flags |= S_NOSEC;
inode->i_flags |= S_NOSEC;
inode->i_flags &= ~S_NOSEC;
#define IS_NOSEC(inode) ((inode)->i_flags & S_NOSEC)
inode->i_flags |= S_NOSEC;