[dm-devel] [PATCH 6/8] scsi: sd_zbc: add zone open, close, and finish support

[Damien Le Moal]

From: Ajay Joshi <ajay.joshi at wdc.com>

Implement REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH
support to allow explicit control of zone states.

Contains contributions from Matias Bjorling, Hans Holmberg,
Keith Busch and Damien Le Moal.

Signed-off-by: Ajay Joshi <ajay.joshi at wdc.com>
Signed-off-by: Matias Bjorling <matias.bjorling at wdc.com>
Signed-off-by: Hans Holmberg <hans.holmberg at wdc.com>
Signed-off-by: Keith Busch <kbusch at kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal at wdc.com>
---
 drivers/scsi/sd.c     | 15 +++++++++++++--
 drivers/scsi/sd.h     |  8 +++++---
 drivers/scsi/sd_zbc.c | 22 +++++++++++++---------
 3 files changed, 31 insertions(+), 14 deletions(-)

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 03163ac5fe95..ff0a22e2a34e 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1290,9 +1290,17 @@ static blk_status_t sd_init_command(struct scsi_cmnd *cmd)
 	case REQ_OP_WRITE:
 		return sd_setup_read_write_cmnd(cmd);
 	case REQ_OP_ZONE_RESET:
-		return sd_zbc_setup_reset_cmnd(cmd, false);
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
+						   false);
 	case REQ_OP_ZONE_RESET_ALL:
-		return sd_zbc_setup_reset_cmnd(cmd, true);
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_RESET_WRITE_POINTER,
+						   true);
+	case REQ_OP_ZONE_OPEN:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_OPEN_ZONE, false);
+	case REQ_OP_ZONE_CLOSE:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_CLOSE_ZONE, false);
+	case REQ_OP_ZONE_FINISH:
+		return sd_zbc_setup_zone_mgmt_cmnd(cmd, ZO_FINISH_ZONE, false);
 	default:
 		WARN_ON_ONCE(1);
 		return BLK_STS_NOTSUPP;
@@ -1960,6 +1968,9 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 	case REQ_OP_WRITE_SAME:
 	case REQ_OP_ZONE_RESET:
 	case REQ_OP_ZONE_RESET_ALL:
+	case REQ_OP_ZONE_OPEN:
+	case REQ_OP_ZONE_CLOSE:
+	case REQ_OP_ZONE_FINISH:
 		if (!result) {
 			good_bytes = blk_rq_bytes(req);
 			scsi_set_resid(SCpnt, 0);
diff --git a/drivers/scsi/sd.h b/drivers/scsi/sd.h
index 1eab779f812b..bf2102a749bc 100644
--- a/drivers/scsi/sd.h
+++ b/drivers/scsi/sd.h
@@ -209,7 +209,8 @@ static inline int sd_is_zoned(struct scsi_disk *sdkp)
 
 extern int sd_zbc_read_zones(struct scsi_disk *sdkp, unsigned char *buffer);
 extern void sd_zbc_print_zones(struct scsi_disk *sdkp);
-extern blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd, bool all);
+blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
+					 unsigned char op, bool all);
 extern void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 			    struct scsi_sense_hdr *sshdr);
 extern int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
@@ -225,8 +226,9 @@ static inline int sd_zbc_read_zones(struct scsi_disk *sdkp,
 
 static inline void sd_zbc_print_zones(struct scsi_disk *sdkp) {}
 
-static inline blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd,
-						   bool all)
+static inline blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
+						       unsigned char op,
+						       bool all)
 {
 	return BLK_STS_TARGET;
 }
diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 1efc69e194f8..39f10ec0dfcf 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -207,13 +207,17 @@ static inline sector_t sd_zbc_zone_sectors(struct scsi_disk *sdkp)
 }
 
 /**
- * sd_zbc_setup_reset_cmnd - Prepare a RESET WRITE POINTER scsi command.
+ * sd_zbc_setup_zone_mgmt_cmnd - Prepare a zone ZBC_OUT command. The operations
+ *			can be RESET WRITE POINTER, OPEN, CLOSE or FINISH.
  * @cmd: the command to setup
- * @all: Reset all zones control.
+ * @op: Operation to be performed
+ * @all: All zones control
  *
- * Called from sd_init_command() for a REQ_OP_ZONE_RESET request.
+ * Called from sd_init_command() for REQ_OP_ZONE_RESET, REQ_OP_ZONE_RESET_ALL,
+ * REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE or REQ_OP_ZONE_FINISH requests.
  */
-blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd, bool all)
+blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
+					 unsigned char op, bool all)
 {
 	struct request *rq = cmd->request;
 	struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
@@ -234,7 +238,7 @@ blk_status_t sd_zbc_setup_reset_cmnd(struct scsi_cmnd *cmd, bool all)
 	cmd->cmd_len = 16;
 	memset(cmd->cmnd, 0, cmd->cmd_len);
 	cmd->cmnd[0] = ZBC_OUT;
-	cmd->cmnd[1] = ZO_RESET_WRITE_POINTER;
+	cmd->cmnd[1] = op;
 	if (all)
 		cmd->cmnd[14] = 0x1;
 	else
@@ -263,14 +267,14 @@ void sd_zbc_complete(struct scsi_cmnd *cmd, unsigned int good_bytes,
 	int result = cmd->result;
 	struct request *rq = cmd->request;
 
-	if (req_op(rq) == REQ_OP_ZONE_RESET &&
+	if (op_is_zone_mgmt(req_op(rq)) &&
 	    result &&
 	    sshdr->sense_key == ILLEGAL_REQUEST &&
 	    sshdr->asc == 0x24) {
 		/*
-		 * INVALID FIELD IN CDB error: reset of a conventional
-		 * zone was attempted. Nothing to worry about, so be
-		 * quiet about the error.
+		 * INVALID FIELD IN CDB error: a zone management command was
+		 * attempted on a conventional zone. Nothing to worry about,
+		 * so be quiet about the error.
 		 */
 		rq->rq_flags |= RQF_QUIET;
 	}
-- 
2.21.0