lkml.org 
[lkml]   [2008]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 5/7] FUSE: implement ioctl support
Tejun Heo wrote:
> Greg KH wrote:
>> Why do we need ioctls? For CUSE? In that case, would we need to copy
>> the memory from userspace, into the kernel, and then back out into
>> userspace again? Can't we just have a "pass-through" type fixed ioctl
>> instead?
>
> Can you elaborate a bit? How the fixed ioctl would know how much to
> copy in and out and from where?

If you're worried about the double copying due to performance reasons,
what we can do is implementing userspace to userspace copying. I just
took easier path of copying twice as u-u copy can't be done using the
existing FUSE mechanics.

--
tejun


\
 
 \ /
  Last update: 2008-08-28 20:13    [W:0.061 / U:41.836 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site