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

From	Eric Biggers <ebiggers3@gmail.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] statx: optimize copy of struct statx to userspace
Date	2017-03-11 22:50 +0100
Message-ID	<tjX3H-fX-5@gated-at.bofh.it> (permalink)
References	<tjMhX-1jq-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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.

Eric

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[PATCH] statx: optimize copy of struct statx to userspace Eric Biggers <ebiggers3@gmail.com> - 2017-03-11 11:20 +0100
  Re: [PATCH] statx: optimize copy of struct statx to userspace David Howells <dhowells@redhat.com> - 2017-03-11 20:30 +0100
  Re: [PATCH] statx: optimize copy of struct statx to userspace Eric Biggers <ebiggers3@gmail.com> - 2017-03-11 22:50 +0100

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