[PATCH 2/3] scsi: Convert SCSI errors to PR_STS errors

[Mike Christie <michael.christie@oracle.com>]

This converts the SCSI errors we commonly see during PR handling to PT_STS
errors, so pr_ops callers can handle scsi and nvme errors without knowing
the device types.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/scsi/sd.c | 43 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index eb76ba055021..667477d1e4b7 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1701,6 +1701,44 @@ static char sd_pr_type(enum pr_type type)
 	}
 };
 
+static enum pr_status sd_scsi_to_block_pr_err(struct scsi_sense_hdr *sshdr,
+					      int result)
+{
+	enum pr_status sts = PR_STS_IOERR;
+
+	switch host_byte(result) {
+	case DID_TRANSPORT_MARGINAL:
+	case DID_TRANSPORT_DISRUPTED:
+	case DID_BUS_BUSY:
+		sts = PR_STS_RETRY_PATH_FAILURE;
+		goto done;
+	case DID_NO_CONNECT:
+		sts = PR_STS_PATH_FAILED;
+		goto done;
+	case DID_TRANSPORT_FAILFAST:
+		sts = PR_STS_PATH_FAST_FAILED;
+		goto done;
+	}
+
+	switch (__get_status_byte(result)) {
+	case SAM_STAT_RESERVATION_CONFLICT:
+		sts = PR_STS_RESERVATION_CONFLICT;
+		goto done;
+	case SAM_STAT_CHECK_CONDITION:
+		if (!scsi_sense_valid(sshdr))
+			goto done;
+
+		if (sshdr->sense_key == ILLEGAL_REQUEST &&
+		    (sshdr->asc == 0x26 || sshdr->asc == 0x24)) {
+			sts = PR_STS_OP_INVALID;
+			goto done;
+		}
+	}
+
+done:
+	return sts;
+}
+
 static int sd_pr_command(struct block_device *bdev, u8 sa,
 		u64 key, u64 sa_key, u8 type, u8 flags)
 {
@@ -1729,7 +1767,10 @@ static int sd_pr_command(struct block_device *bdev, u8 sa,
 		scsi_print_sense_hdr(sdev, NULL, &sshdr);
 	}
 
-	return result;
+	if (result <= 0)
+		return result;
+
+	return sd_scsi_to_block_pr_err(&sshdr, result);
 }
 
 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
-- 
2.25.1