lkml.org 
[lkml]   [2014]   [Nov]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC] situation with csum_and_copy_... API
On Fri, Nov 21, 2014 at 05:42:55PM +0000, David Laight wrote:

> Callers of kernel_send/recvmsg() could easily be using a wrapper
> function that creates the 'msghdr'.
> When the want to send the remaining part of a buffer the old iterator
> will no longer be available - just the original iov and the required offset.

Er... So why not copy a struct iov_iter to/from msg->msg_iter, then?
It's not as it had been particulary large - 5 words isn't much...

I'm not at all sure that _anything_ has valid reasons for draining iovecs.
Maintaining a struct iov_iter and modifying it is easy and actually faster...

Right now the main examples outside of net/* are due to unfortunate
limitations of ->sendmsg() - until now it had no way to be told that
desired data starts at offset. With ->msg_iter it obviously becomes
possible...


\
 
 \ /
  Last update: 2014-11-21 21:21    [W:0.178 / U:0.612 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site