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nvmet: convert from kmap to nvmet_copy_from_sgl

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This is safer as it doesn't rely on the data being stored in
a single page in an sgl.

It also aids our effort to start phasing out users of sg_page. See [1].

For this we kmalloc some memory, copy to it and free at the end. Note:
we can't allocate this memory on the stack as the kbuild test robot
reports some frame size overflows on i386.

[1] https://lwn.net/Articles/720053/

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Logan Gunthorpe 2017-04-18 17:32:15 -06:00 committed by Christoph Hellwig
parent f9f38e3338
commit 1c05cf9058
1 changed files with 25 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

32
drivers/nvme/target/fabrics-cmd.c
View file

@ -122,7 +122,15 @@ 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 = kmalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
status = NVME_SC_INTERNAL;
goto complete;
}
status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
if (status)
goto out;
/* zero out initial completion result, assign values as needed */
req->rsp->result.u32 = 0;
@ -143,7 +151,7 @@ static void nvmet_execute_admin_connect(struct nvmet_req *req)
}
status = nvmet_alloc_ctrl(d->subsysnqn, d->hostnqn, req,
le32_to_cpu(c->kato), &ctrl);
le32_to_cpu(c->kato), &ctrl);
if (status)
goto out;
@ -158,7 +166,8 @@ 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));
kfree(d);
complete:
nvmet_req_complete(req, status);
}
@ -170,7 +179,15 @@ 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 = kmalloc(sizeof(*d), GFP_KERNEL);
if (!d) {
status = NVME_SC_INTERNAL;
goto complete;
}
status = nvmet_copy_from_sgl(req, 0, d, sizeof(*d));
if (status)
goto out;
/* zero out initial completion result, assign values as needed */
req->rsp->result.u32 = 0;
@ -183,8 +200,8 @@ static void nvmet_execute_io_connect(struct nvmet_req *req)
}
status = nvmet_ctrl_find_get(d->subsysnqn, d->hostnqn,
le16_to_cpu(d->cntlid),
req, &ctrl);
le16_to_cpu(d->cntlid),
req, &ctrl);
if (status)
goto out;
@ -205,7 +222,8 @@ 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));
kfree(d);
complete:
nvmet_req_complete(req, status);
return;