Re: [PATCH 05/18] Add io_uring IO interface

On Tue, Jan 29, 2019 at 7:45 AM Christoph Hellwig [off-list ref] wrote:

On Mon, Jan 28, 2019 at 06:20:08PM -0700, Jens Axboe wrote:

quoted

Sure, that would be straight forward. Is there a strong reason to do
so outside of "that would be nice"? It's not like it's a huge amount
of code.

And it would be really painful for userspace.  Because now you
can't pass struct iovec through from a higher level, but will instead
of to copy the iovec to a different type in the submission path.

Agreed. However, if we decide to add the in_compat_syscall() check
to set_user_sigmask()/set_compat_user_sigmask(), we probably want
to do the same thing in import_iovec()/compat_import_iovec() and
rw_copy_check_uvector()/compat_rw_copy_check_uvector().

      Arnd