On 10/1/20 12:54 AM, Coly Li wrote:
> In iscsci driver, iscsi_tcp_segment_map() uses the following code to
> check whether the page should or not be handled by sendpage:
> if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)))
>
> The "page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)" part is to
> make sure the page can be sent to network layer's zero copy path. This
> part is exactly what sendpage_ok() does.
>
> This patch uses use sendpage_ok() in iscsi_tcp_segment_map() to replace
> the original open coded checks.
>
> Signed-off-by: Coly Li <col...@suse.de>
> Acked-by: Martin K. Petersen <martin.peter...@oracle.com>
> Cc: Vasily Averin <v...@virtuozzo.com>
> Cc: Cong Wang <amw...@redhat.com>
> Cc: Mike Christie <micha...@cs.wisc.edu>
> Cc: Lee Duncan <ldun...@suse.com>
> Cc: Chris Leech <cle...@redhat.com>
> Cc: Christoph Hellwig <h...@lst.de>
> Cc: Hannes Reinecke <h...@suse.de>
> ---
> drivers/scsi/libiscsi_tcp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/libiscsi_tcp.c b/drivers/scsi/libiscsi_tcp.c
> index 37e5d4e48c2f..83f14b2c8804 100644
> --- a/drivers/scsi/libiscsi_tcp.c
> +++ b/drivers/scsi/libiscsi_tcp.c
> @@ -128,7 +128,7 @@ static void iscsi_tcp_segment_map(struct iscsi_segment
> *segment, int recv)
> * coalescing neighboring slab objects into a single frag which
> * triggers one of hardened usercopy checks.
> */
> - if (!recv && page_count(sg_page(sg)) >= 1 && !PageSlab(sg_page(sg)))
> + if (!recv && sendpage_ok(sg_page(sg)))
> return;
>
> if (recv) {
>
Reviewed-by: Lee Duncan <ldun...@suse.com>
