Re: [PATCH 0/4] fs: add mount_setattr()

On Tue, Jul 14, 2020 at 06:14:11PM +0200, Christian Brauner wrote:

mount_setattr() can be expected to grow over time and is designed with
extensibility in mind. It follows the extensible syscall pattern we have
used with other syscalls such as openat2(), clone3(),
sched_{set,get}attr(), and others.

I.e. it's a likely crap insertion vector; any patches around that thing
will require the same level of review as addition of a brand new syscall.
And they will be harder to spot - consider the likely subjects for such
patches and compare to open addition of a new syscall...