[PATCH v3 4/4] nvme: Convert NVMe errors to PR errors

[Mike Christie <michael.christie@xxxxxxxxxx>]

This converts the NVMe errors we commonly see during PR handling to PR_STS
errors or -Exyz errors. pr_ops callers can then handle scsi and nvme errors
without knowing the device types.

Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 drivers/nvme/host/core.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index da55ce45ac70..6cd66f6d5e9b 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -2103,11 +2103,34 @@ static int nvme_send_ns_pr_command(struct nvme_ns *ns, struct nvme_command *c,
 	return nvme_submit_sync_cmd(ns->queue, c, data, 16);
 }
 
+static int nvme_sc_to_pr_err(int nvme_sc)
+{
+	if (nvme_is_path_error(nvme_sc))
+		return PR_STS_PATH_FAILED;
+
+	switch (nvme_sc) {
+	case NVME_SC_SUCCESS:
+		return PR_STS_SUCCESS;
+	case NVME_SC_RESERVATION_CONFLICT:
+		return PR_STS_RESERVATION_CONFLICT;
+	case NVME_SC_ONCS_NOT_SUPPORTED:
+		return -EOPNOTSUPP;
+	case NVME_SC_BAD_ATTRIBUTES:
+	case NVME_SC_INVALID_OPCODE:
+	case NVME_SC_INVALID_FIELD:
+	case NVME_SC_INVALID_NS:
+		return -EINVAL;
+	default:
+		return PR_STS_IOERR;
+	}
+}
+
 static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 				u64 key, u64 sa_key, u8 op)
 {
 	struct nvme_command c = { };
 	u8 data[16] = { 0, };
+	int ret;
 
 	put_unaligned_le64(key, &data[0]);
 	put_unaligned_le64(sa_key, &data[8]);
@@ -2117,8 +2140,14 @@ static int nvme_pr_command(struct block_device *bdev, u32 cdw10,
 
 	if (IS_ENABLED(CONFIG_NVME_MULTIPATH) &&
 	    bdev->bd_disk->fops == &nvme_ns_head_ops)
-		return nvme_send_ns_head_pr_command(bdev, &c, data);
-	return nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c, data);
+		ret = nvme_send_ns_head_pr_command(bdev, &c, data);
+	else
+		ret = nvme_send_ns_pr_command(bdev->bd_disk->private_data, &c,
+					      data);
+	if (ret < 0)
+		return ret;
+
+	return nvme_sc_to_pr_err(ret);
 }
 
 static int nvme_pr_register(struct block_device *bdev, u64 old,
-- 
2.25.1