From: Christoph Hellwig <hch@lst.de>
Date: Tue, 22 May 2018 11:10:02 +0200
Subject: [PATCH] nvmet: add a new nvmet_zero_sgl helper
References: bsc#1054245
Git-commit: c7759fff22657d0e03b508f8f3ef97efbb10bc13
Patch-mainline: v4.18-rc1
Zeroes the SGL in the payload.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/nvme/target/core.c | 7 +++++++
drivers/nvme/target/nvmet.h | 1 +
2 files changed, 8 insertions(+)
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index e95424f172fd..6a71fb1affc9 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -57,6 +57,13 @@ u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
return 0;
}
+u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len)
+{
+ if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len)
+ return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
+ return 0;
+}
+
static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys)
{
struct nvmet_ns *ns;
diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h
index 8aecef5f818b..77779522eb2a 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -314,6 +314,7 @@ u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
size_t len);
u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
size_t len);
+u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
u32 nvmet_get_log_page_len(struct nvme_command *cmd);
--
2.12.3