[PATCH v6] Implement -e trace=%statfs option for tracing statfs like syscalls

[Eugene Syromyatnikov]

> None of stat related syscalls have their corresponding flag set.
> $  grep -nr '_\(\|f\|l\)stat' linux/*/syscallent*
> 
> Should these be updated with their corresponding tags ?
> fstatfs*-> TD
> lstat*-> TD
> {,old_}stat*-> TF
> or are they intensional?
Most probably these compatibility calls has been overlooked. As they are
has the same semantics, they indeed should be a part of appropriate
syscall groups.