Re: [PATCH] statx: optimize copy of struct statx to userspace

From: Eric Biggers
Date: Sat Mar 11 2017 - 16:44:23 EST

On Sat, Mar 11, 2017 at 02:15:10AM -0800, Eric Biggers wrote:
> stat() instead initializes its struct on the stack and copies it to
> userspace with a single call to copy_to_user(). This turns out to be
> much faster, and changing statx to do this makes it almost as fast as
> stat:

Hmm, I missed that the access_ok() check in sys_statx() will no longer be
needed. I'm sending a revised patch that removes that too.