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authorChristoph Hellwig <hch@lst.de>2018-05-22 12:10:02 +0300
committerChristoph Hellwig <hch@lst.de>2018-06-01 15:37:35 +0300
commitc7759fff22657d0e03b508f8f3ef97efbb10bc13 (patch)
tree7b1c0135a8b5aa4fe1837a20bef91a7b95925f33 /drivers/nvme
parentaafd3afe9d2e731f50477cd1b4db7efa86d2637a (diff)
downloadlinux-c7759fff22657d0e03b508f8f3ef97efbb10bc13.tar.xz
nvmet: add a new nvmet_zero_sgl helper
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>
Diffstat (limited to 'drivers/nvme')
-rw-r--r--drivers/nvme/target/core.c7
-rw-r--r--drivers/nvme/target/nvmet.h1
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 800aaf96ddcd..55c4bc693aa2 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 32ebffcf464c..768abe203298 100644
--- a/drivers/nvme/target/nvmet.h
+++ b/drivers/nvme/target/nvmet.h
@@ -330,6 +330,7 @@ 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);