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>
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@ -57,6 +57,13 @@ u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len)
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return 0;
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}
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u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len)
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{
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if (sg_zero_buffer(req->sg, req->sg_cnt, len, off) != len)
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return NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR;
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return 0;
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}
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static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys)
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{
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struct nvmet_ns *ns;
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@ -330,6 +330,7 @@ u16 nvmet_copy_to_sgl(struct nvmet_req *req, off_t off, const void *buf,
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size_t len);
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u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf,
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size_t len);
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u16 nvmet_zero_sgl(struct nvmet_req *req, off_t off, size_t len);
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u32 nvmet_get_log_page_len(struct nvme_command *cmd);
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