Re: [PATCH] zerocopy NFS updated

Benjamin LaHaise
2002-04-11T17:36:12Z

On Thu, Apr 11, 2002 at 03:16:16PM +0200, Andi Kleen wrote:
> On Thu, Apr 11, 2002 at 04:00:37PM -0200, Denis Vlasenko wrote:
> > On 11 April 2002 09:36, David S. Miller wrote:
> > > No, you must block truncate operations on the file until the client
> > > ACK's the nfsd read request if you wish to use sendfile() with
> > > nfsd.
> >
> > Which shouldn't be a big performance problem unless I am unaware
> > of some real-life applications doing heavy truncates.
>
> Every unlink does a truncate. There are applications that delete files
> a lot.

Not quite. The implicite truncate only happens when the link count falls
to 0 and the last user of the inode releases their reference to the inode.

-ben
--
"A man with a bass just walked in,
and he's putting it down
on the floor."