linux-kernel - Re: [PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd

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Date:	Mon, 18 Jul 2016 16:23:44 +0100 (BST)
From:	James Simmons <jsimmons@...radead.org>
To:	Oleg Drokin <oleg.drokin@...el.com>
cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andreas Dilger <andreas.dilger@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Lustre Development List <lustre-devel@...ts.lustre.org>
Subject: Re: [PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send


> On Jul 11, 2016, at 1:18 PM, James Simmons wrote:
> 
> > With the move to iov_iter handling two issues merged
> > for the ko2iblnd driver. The first fix address a simple
> > typo of the wrong flag being used with iov_iter_kvec.
> > The second fix adds the payload offset to the payload
> > size.
> > 
> > Signed-off-by: James Simmons <jsimmons@...radead.org>
> > ---
> > drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c | 13 ++++++++-----
> > 1 file changed, 8 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> > index 3d597dc..437e149 100644
> > --- a/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> > +++ b/drivers/staging/lustre/lnet/klnds/o2iblnd/o2iblnd_cb.c
> > @@ -1519,12 +1519,15 @@ kiblnd_send(lnet_ni_t *ni, void *private, lnet_msg_t *lntmsg)
> > 	/* payload is either all vaddrs or all pages */
> > 	LASSERT(!(payload_kiov && payload_iov));
> > 
> > -	if (payload_kiov)
> > +	if (payload_kiov) {
> 
> The braces are in fact going to make checkpatch complain that we do not
> need them here.
> 
> > 		iov_iter_bvec(&from, ITER_BVEC | WRITE,
> > -				payload_kiov, payload_niov, payload_nob);
> > -	else
> > -		iov_iter_kvec(&from, ITER_BVEC | WRITE,
> > -				payload_iov, payload_niov, payload_nob);
> > +			      payload_kiov, payload_niov,
> > +			      payload_nob + payload_offset);
> 
> Why are we adding the offset to number of bytes here?
> 
> > +	} else {
> > +		iov_iter_kvec(&from, ITER_KVEC | WRITE,
> > +			      payload_iov, payload_niov,
> > +			      payload_nob + payload_offset);
> > +	}
> > 	iov_iter_advance(&from, payload_offset);
> 
> Ah, I guess we added it there to then subtract here?
> 
> Do you mind if I just merge this change into Al's patch with you as another
> Signed-off-by line instead?

Sure, I'm fine with that. All I care is that this is merged.

> Since we caught this early, probably no point in having a breakage point in
> the history as it might break a future bisect.
> 
> 
> > 	switch (type) {
> > -- 
> > 2.7.4
> 
>