[PATCH 1/1] s390/dasd: fix command reject error on ESE devices

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

Formatting a thin-provisioned (ESE) device that is part of a PPRC copy
relation might fail with the following error:

dasd-eckd 0.0.f500: An error occurred in the DASD device driver, reason=09
[...]
24 Byte: 0 MSG 4, no MSGb to SYSOP

During format of an ESE disk the Release Allocated Space command is used.
A bit in the payload of the command is set that is not allowed to be set
for devices in a copy relation. This bit is set to allow the partial
release of an extent.

Check for the existence of a copy relation before setting the respective
bit.

Fixes: 91dc4a197569 ("s390/dasd: Add new ioctl to release space")
Cc: stable@kernel.org # 5.3+
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
---
 drivers/s390/block/dasd_eckd.c | 33 +++++++++++++++++++++++++++++++--
 1 file changed, 31 insertions(+), 2 deletions(-)

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index ade1369fe5ed..113c509bf6d0 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -127,6 +127,8 @@ static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 			struct dasd_device *, struct dasd_device *,
 			unsigned int, int, unsigned int, unsigned int,
 			unsigned int, unsigned int);
+static int dasd_eckd_query_pprc_status(struct dasd_device *,
+				       struct dasd_pprc_data_sc4 *);
 
 /* initial attempt at a probe function. this can be simplified once
  * the other detection code is gone */
@@ -3733,6 +3735,26 @@ static int count_exts(unsigned int from, unsigned int to, int trks_per_ext)
 	return count;
 }
 
+static int dasd_in_copy_relation(struct dasd_device *device)
+{
+	struct dasd_pprc_data_sc4 *temp;
+	int rc;
+
+	if (!dasd_eckd_pprc_enabled(device))
+		return 0;
+
+	temp = kzalloc(sizeof(*temp), GFP_KERNEL);
+	if (!temp)
+		return -ENOMEM;
+
+	rc = dasd_eckd_query_pprc_status(device, temp);
+	if (!rc)
+		rc = temp->dev_info[0].state;
+
+	kfree(temp);
+	return rc;
+}
+
 /*
  * Release allocated space for a given range or an entire volume.
  */
@@ -3749,6 +3771,7 @@ dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
 	int cur_to_trk, cur_from_trk;
 	struct dasd_ccw_req *cqr;
 	u32 beg_cyl, end_cyl;
+	int copy_relation;
 	struct ccw1 *ccw;
 	int trks_per_ext;
 	size_t ras_size;
@@ -3760,6 +3783,10 @@ dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
 	if (dasd_eckd_ras_sanity_checks(device, first_trk, last_trk))
 		return ERR_PTR(-EINVAL);
 
+	copy_relation = dasd_in_copy_relation(device);
+	if (copy_relation < 0)
+		return ERR_PTR(copy_relation);
+
 	rq = req ? blk_mq_rq_to_pdu(req) : NULL;
 
 	features = &private->features;
@@ -3788,9 +3815,11 @@ dasd_eckd_dso_ras(struct dasd_device *device, struct dasd_block *block,
 	/*
 	 * This bit guarantees initialisation of tracks within an extent that is
 	 * not fully specified, but is only supported with a certain feature
-	 * subset.
+	 * subset and for devices not in a copy relation.
 	 */
-	ras_data->op_flags.guarantee_init = !!(features->feature[56] & 0x01);
+	if (features->feature[56] & 0x01 && !copy_relation)
+		ras_data->op_flags.guarantee_init = 1;
+
 	ras_data->lss = private->conf.ned->ID;
 	ras_data->dev_addr = private->conf.ned->unit_addr;
 	ras_data->nr_exts = nr_exts;
-- 
2.39.2