[PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send

[PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send

[James Simmons]

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@infradead.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) {
 		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);
+	} else {
+		iov_iter_kvec(&from, ITER_KVEC | WRITE,
+			      payload_iov, payload_niov,
+			      payload_nob + payload_offset);
+	}
 	iov_iter_advance(&from, payload_offset);
 
 	switch (type) {
-- 
2.7.4

Re: [PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send

[Oleg Drokin]

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@infradead.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?
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

Re: [PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send

[Al Viro]

On Fri, Jul 15, 2016 at 01:01:35AM -0400, Oleg Drokin wrote:

> > +	} 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?

Yes (and that actually fixes a real bug there).

> Do you mind if I just merge this change into Al's patch with you as another
> Signed-off-by line instead?
> Since we caught this early, probably no point in having a breakage point in
> the history as it might break a future bisect.

No objections from me.  FWIW, I'd rather have all of that go through your
tree - it's independent from everything else in vfs.git and pulls quite
a bit from yours, so...

Re: [PATCH] staging: lustre: o2iblnd: iov fixes for kiblnd_send

[James Simmons]

> 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@infradead.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
> 
>