From c7759fff22657d0e03b508f8f3ef97efbb10bc13 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 22 May 2018 11:10:02 +0200 Subject: [PATCH] nvmet: add a new nvmet_zero_sgl helper Zeroes the SGL in the payload. Signed-off-by: Christoph Hellwig Reviewed-by: Sagi Grimberg Reviewed-by: Johannes Thumshirn --- 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 800aaf9..55c4bc6 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 32ebffc..768abe2 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); -- 2.7.4