linux-kernel - Re: On current git head webservers stopped working

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Message-ID: <20070713181747.GX5328@kernel.dk>
Date:	Fri, 13 Jul 2007 20:17:48 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Gabriel C <nix.or.die@...glemail.com>,
	linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: On current git head webservers stopped working

On Fri, Jul 13 2007, Jens Axboe wrote:
> On Fri, Jul 13 2007, Linus Torvalds wrote:
> > 
> > 
> > On Fri, 13 Jul 2007, Jens Axboe wrote:
> > > 
> > > Does this work?
> > 
> > Ok, so it apparently works, but:
> > 
> > > diff --git a/fs/splice.c b/fs/splice.c
> > > index ed2ce99..92646aa 100644
> > > --- a/fs/splice.c
> > > +++ b/fs/splice.c
> > > @@ -491,7 +491,7 @@ ssize_t generic_file_splice_read(struct file *in, loff_t *ppos,
> > >  
> > >  	ret = 0;
> > >  	spliced = 0;
> > > -	while (len) {
> > > +	while (len && !spliced) {
> > >  		ret = __generic_file_splice_read(in, ppos, pipe, len, flags);
> > 
> > This hunk basically make sthe whole "while" loop pointless. You'll never 
> > go through it more than once.
> > 
> > So at that point, maybe the loop should be removed entirely? Or maybe this 
> > part of the patch is wrong, and the fix was in the _other_ parts?
> 
> It'll likely work without that hunk, and you are right - the loop
> should just go now. I'll update that piece in a sub sequent patch!

Oh btw, forgot to mention - that hunk isn't wrong, it's just not the fix
for that particular bug. In reality it should probably have been part of
a different patch dropping that loop as well... Anyway, I'll do that
patch and indicate as such in the changelog for that commit.

-- 
Jens Axboe

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