[PATCH 3/3] scsi: handle zone resources errors

[Damien Le Moal <damien.lemoal@wdc.com>]

ZBC or ZAC disks that have a limit on the number of open zones may fail
a zone open command or a write to a zone that is not already implicitly
or explicitly open if the total number of open zones is already at the
maximum allowed.

For these operations, instead of returning the generic BLK_STS_IOERR,
return BLK_STS_DEV_RESOURCE which is returned as -EBUSY to the I/O
issuer, allowing the device user to act appropriately on these
relatively benign zone resource errors.

With this change the NVMe (ZNS) and sd drivers both return the same
error code for zone resource errors, facilitating the implementation of
IO error handling by the user with a common code base for both device
types.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 drivers/scsi/scsi_lib.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 7c6dd6f75190..7eb4a80c3bbb 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -758,6 +758,18 @@ static void scsi_io_completion_action(struct scsi_cmnd *cmd, int result)
 			/* See SSC3rXX or current. */
 			action = ACTION_FAIL;
 			break;
+		case DATA_PROTECT:
+			sdev_printk(KERN_INFO, cmd->device,
+				    "asc/ascq = 0x%02x 0x%02x\n",
+				    sshdr.asc, sshdr.ascq);
+			action = ACTION_FAIL;
+			if ((sshdr.asc == 0x0C && sshdr.ascq == 0x12) ||
+			    (sshdr.asc == 0x55 &&
+			     (sshdr.ascq == 0x0E || sshdr.ascq == 0x0F))) {
+				/* Insufficient zone resources */
+				blk_stat = BLK_STS_DEV_RESOURCE;
+			}
+			break;
 		default:
 			action = ACTION_FAIL;
 			break;
-- 
2.26.2