[LTP] [PATCH v2] syscalls/mount_setattr01: Add basic functional test

[Petr Vorel]

> Hi!
> > > +struct mount_attr {
> > > +	uint64_t attr_set;
> > > +	uint64_t attr_clr;
> > > +	uint64_t propagation;
> > > +	uint64_t userns_fd;
> > > +};
> > Interesting enough: in kernel tools/testing/selftests/mount_setattr/mount_setattr_test.c
> > defines it as __u64 (IMHO should be really uint64_t as that test is userspace as
> > Cyril pointed out) but real kernel code in fs/namespace.c happily uses "unsigned
> > int" :).

> You are just confused by the fact that there are two different
> structures there is mount_attr and mount_kattr, the mount_setattr()
> syscall gets the mount_attr from userspace and then fills in mount_kattr
> based on that. See the function build_mount_kattr() in fs/namespace.c

> I guess that this is simply done so that there is enough space for flags
> to be added in the future without a need to change the structure.

Ah, thx for info.

Kind regards,
Petr