[PATCH v6 16/18] s390/dasd: Report ESE capability and format mode at device online

[Stefan Haberland <sth@linux.ibm.com>]

Extend the device information line logged when a volume comes online with
the ESE hardware capability and the on-disk format mode. The format mode
(full or on demand) is derived from the on-disk format label alone, so a
volume that is not backed by ESE hardware but was still formatted on
demand is reported correctly.

Reviewed-by: Jan Höppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
 drivers/s390/block/dasd_eckd.c | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 69a6a462e3e2..428a691ed5a1 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2522,6 +2522,7 @@ static int dasd_eckd_end_analysis(struct dasd_block *block)
 	struct dasd_device *device = block->base;
 	struct dasd_eckd_private *private = device->private;
 	struct eckd_count *count_area;
+	const char *ese_str, *fmt_str;
 	unsigned int sb, blk_per_trk;
 	int status, i;
 	struct dasd_ccw_req *init_cqr;
@@ -2608,15 +2609,29 @@ static int dasd_eckd_end_analysis(struct dasd_block *block)
 			  private->rdc_data.trk_per_cyl *
 			  blk_per_trk);
 
+	/*
+	 * Report the ESE hardware capability and the format mode. The mode
+	 * comes from dasd_eckd_on_demand_format() (the on-disk label, or the
+	 * ESE state when no label is present), matching the on_demand_formatting
+	 * sysfs attribute.
+	 */
+	ese_str = dasd_eckd_ese_capable(device) ? ", ESE" : "";
+	fmt_str = "";
+	if (dasd_eckd_on_demand_format(device))
+		fmt_str = ", on-demand format";
+	else if (dasd_eckd_ese_capable(device))
+		fmt_str = ", full format";
+
 	dev_info(&device->cdev->dev,
-		 "DASD with %u KB/block, %lu KB total size, %u KB/track, "
-		 "%s\n", (block->bp_block >> 10),
+		 "DASD with %u KB/block, %lu KB total size, %u KB/track, %s%s%s\n",
+		 (block->bp_block >> 10),
 		 (((unsigned long) private->real_cyl *
 		   private->rdc_data.trk_per_cyl *
 		   blk_per_trk * (block->bp_block >> 9)) >> 1),
 		 ((blk_per_trk * block->bp_block) >> 10),
 		 private->uses_cdl ?
-		 "compatible disk layout" : "linux disk layout");
+		 "compatible disk layout" : "linux disk layout",
+		 ese_str, fmt_str);
 
 	return 0;
 }
-- 
2.53.0