[02/22] nvmet: Make use of the new sg_map helper function
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Message ID 1492121135-4437-3-git-send-email-logang@deltatee.com
State New, archived
Headers show

Commit Message

Logan Gunthorpe April 13, 2017, 10:05 p.m. UTC
This is a straight forward conversion in two places. Should kmap fail,
the code will return an INVALD_DATA error in the completion.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
 drivers/nvme/target/fabrics-cmd.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

Comments

Christoph Hellwig April 14, 2017, 4:59 a.m. UTC | #1
On Thu, Apr 13, 2017 at 04:05:15PM -0600, Logan Gunthorpe wrote:
> This is a straight forward conversion in two places. Should kmap fail,
> the code will return an INVALD_DATA error in the completion.

It really should be using nvmet_copy_from_sgl to make things safer,
as we don't want to rely on any particular SG list layout.  In fact
I'm pretty sure I did the conversion at some point, but it must never
have made it upstream.
Logan Gunthorpe April 14, 2017, 5:06 a.m. UTC | #2
On 13/04/17 10:59 PM, Christoph Hellwig wrote:
> On Thu, Apr 13, 2017 at 04:05:15PM -0600, Logan Gunthorpe wrote:
>> This is a straight forward conversion in two places. Should kmap fail,
>> the code will return an INVALD_DATA error in the completion.
> 
> It really should be using nvmet_copy_from_sgl to make things safer,
> as we don't want to rely on any particular SG list layout.  In fact
> I'm pretty sure I did the conversion at some point, but it must never
> have made it upstream.

Ha, I did the conversion too a couple times for my RFC series. I can
change this patch to do that. Or maybe I'll just send a patch for that
separately seeing it doesn't depend on anything and is pretty simple. I
can do that next week.

Thanks,

Logan
Christoph Hellwig April 14, 2017, 5:18 a.m. UTC | #3
On Thu, Apr 13, 2017 at 11:06:16PM -0600, Logan Gunthorpe wrote:
> Or maybe I'll just send a patch for that
> separately seeing it doesn't depend on anything and is pretty simple. I
> can do that next week.

Yes, please just send that patch linux-nvme, we should be able to get
it into 4.12.

Patch
diff mbox

diff --git a/drivers/nvme/target/fabrics-cmd.c b/drivers/nvme/target/fabrics-cmd.c
index 8bd022af..f62a634 100644
--- a/drivers/nvme/target/fabrics-cmd.c
+++ b/drivers/nvme/target/fabrics-cmd.c
@@ -122,7 +122,11 @@  static void nvmet_execute_admin_connect(struct nvmet_req *req)
 	struct nvmet_ctrl *ctrl = NULL;
 	u16 status = 0;
 
-	d = kmap(sg_page(req->sg)) + req->sg->offset;
+	d = sg_map(req->sg, SG_KMAP);
+	if (IS_ERR(d)) {
+		status = NVME_SC_SGL_INVALID_DATA;
+		goto out;
+	}
 
 	/* zero out initial completion result, assign values as needed */
 	req->rsp->result.u32 = 0;
@@ -158,7 +162,7 @@  static void nvmet_execute_admin_connect(struct nvmet_req *req)
 	req->rsp->result.u16 = cpu_to_le16(ctrl->cntlid);
 
 out:
-	kunmap(sg_page(req->sg));
+	sg_unmap(req->sg, d, SG_KMAP);
 	nvmet_req_complete(req, status);
 }
 
@@ -170,7 +174,11 @@  static void nvmet_execute_io_connect(struct nvmet_req *req)
 	u16 qid = le16_to_cpu(c->qid);
 	u16 status = 0;
 
-	d = kmap(sg_page(req->sg)) + req->sg->offset;
+	d = sg_map(req->sg, SG_KMAP);
+	if (IS_ERR(d)) {
+		status = NVME_SC_SGL_INVALID_DATA;
+		goto out;
+	}
 
 	/* zero out initial completion result, assign values as needed */
 	req->rsp->result.u32 = 0;
@@ -205,7 +213,7 @@  static void nvmet_execute_io_connect(struct nvmet_req *req)
 	pr_info("adding queue %d to ctrl %d.\n", qid, ctrl->cntlid);
 
 out:
-	kunmap(sg_page(req->sg));
+	sg_unmap(req->sg, d, SG_KMAP);
 	nvmet_req_complete(req, status);
 	return;