[PATCH 3/7] nvmet: file: add support of Compare command

[Dmitry Bogdanov]

Add handling of Compare command in file backend.

Signed-off-by: Dmitry Bogdanov <d.bogdanov at yadro.com>
---
 drivers/nvme/target/io-cmd-file.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 2d068439b129..27ceb1120d6a 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -114,6 +114,15 @@ static void nvmet_file_io_done(struct kiocb *iocb, long ret)
 
 	if (unlikely(ret != req->transfer_len))
 		status = errno_to_nvme_status(req, ret);
+
+	if (req->cmd->rw.opcode == nvme_cmd_compare) {
+		if (likely(!status))
+			status = nvmet_compare_sg(req);
+
+		sgl_free(req->sg);
+		req->sg = req->cmp_sg;
+	}
+
 	nvmet_req_complete(req, status);
 }
 
@@ -227,6 +236,17 @@ static void nvmet_file_execute_rw(struct nvmet_req *req)
 		return;
 	}
 
+	if (req->cmd->rw.opcode == nvme_cmd_compare) {
+		req->cmp_sg = req->sg;
+		req->sg = sgl_alloc(nvmet_rw_data_len(req), GFP_KERNEL,
+					&req->sg_cnt);
+
+		if (unlikely(!req->sg || WARN_ON(nr_bvec != req->sg_cnt))) {
+			nvmet_req_complete(req, NVME_SC_INTERNAL);
+			return;
+		}
+	}
+
 	if (nr_bvec > NVMET_MAX_INLINE_BIOVEC)
 		req->f.bvec = kmalloc_array(nr_bvec, sizeof(struct bio_vec),
 				GFP_KERNEL);
@@ -365,6 +385,7 @@ u16 nvmet_file_parse_io_cmd(struct nvmet_req *req)
 	switch (req->cmd->common.opcode) {
 	case nvme_cmd_read:
 	case nvme_cmd_write:
+	case nvme_cmd_compare:
 		req->execute = nvmet_file_execute_rw;
 		return 0;
 	case nvme_cmd_flush:
-- 
2.25.1