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nvmet: add a new nvmet_zero_sgl helper

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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>
This commit is contained in:
Christoph Hellwig 2018-05-22 11:10:02 +02:00
parent aafd3afe9d
commit c7759fff22
2 changed files with 8 additions and 0 deletions
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7
drivers/nvme/target/core.c
View file

@ -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;

1
drivers/nvme/target/nvmet.h
View file

@ -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);