[PATCH 2/2] s390/dasd: fix error recovery leading to data corruption on ESE devices

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

Extent Space Efficient (ESE) or thin provisioned volumes need to be
formatted on demand during usual IO processing.

The dasd_ese_needs_format function checks for error codes that signal
the non existence of a proper track format.

The check for incorrect length is to imprecise since other error cases
leading to transport of insufficient data also have this flag set.
This might lead to data corruption in certain error cases for example
during a storage server warmstart.

Fix by removing the check for incorrect length and replacing by
explicitly checking for invalid track format in transport mode.

Also remove the check for file protected since this is not a valid
ESE handling case.

Cc: <stable@vger.kernel.org> # 5.3+
Fixes: 5e2b17e712cf ("s390/dasd: Add dynamic formatting support for ESE volumes")
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
---
 drivers/s390/block/dasd.c          | 36 ++++++++++++-------
 drivers/s390/block/dasd_3990_erp.c | 10 ++----
 drivers/s390/block/dasd_eckd.c     | 55 +++++++++++++-----------------
 drivers/s390/block/dasd_int.h      |  2 +-
 4 files changed, 50 insertions(+), 53 deletions(-)

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 0a97cfedd706..42a4a996defb 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -1601,9 +1601,15 @@ static int dasd_ese_needs_format(struct dasd_block *block, struct irb *irb)
 	if (!sense)
 		return 0;
 
-	return !!(sense[1] & SNS1_NO_REC_FOUND) ||
-		!!(sense[1] & SNS1_FILE_PROTECTED) ||
-		scsw_cstat(&irb->scsw) == SCHN_STAT_INCORR_LEN;
+	if (sense[1] & SNS1_NO_REC_FOUND)
+		return 1;
+
+	if ((sense[1] & SNS1_INV_TRACK_FORMAT) &&
+	    scsw_is_tm(&irb->scsw) &&
+	    !(sense[2] & SNS2_ENV_DATA_PRESENT))
+		return 1;
+
+	return 0;
 }
 
 static int dasd_ese_oos_cond(u8 *sense)
@@ -1624,7 +1630,7 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
 	struct dasd_device *device;
 	unsigned long now;
 	int nrf_suppressed = 0;
-	int fp_suppressed = 0;
+	int it_suppressed = 0;
 	struct request *req;
 	u8 *sense = NULL;
 	int expires;
@@ -1679,8 +1685,9 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
 		 */
 		sense = dasd_get_sense(irb);
 		if (sense) {
-			fp_suppressed = (sense[1] & SNS1_FILE_PROTECTED) &&
-				test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
+			it_suppressed =	(sense[1] & SNS1_INV_TRACK_FORMAT) &&
+				!(sense[2] & SNS2_ENV_DATA_PRESENT) &&
+				test_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags);
 			nrf_suppressed = (sense[1] & SNS1_NO_REC_FOUND) &&
 				test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
 
@@ -1695,7 +1702,7 @@ void dasd_int_handler(struct ccw_device *cdev, unsigned long intparm,
 				return;
 			}
 		}
-		if (!(fp_suppressed || nrf_suppressed))
+		if (!(it_suppressed || nrf_suppressed))
 			device->discipline->dump_sense_dbf(device, irb, "int");
 
 		if (device->features & DASD_FEATURE_ERPLOG)
@@ -2459,14 +2466,17 @@ static int _dasd_sleep_on_queue(struct list_head *ccw_queue, int interruptible)
 	rc = 0;
 	list_for_each_entry_safe(cqr, n, ccw_queue, blocklist) {
 		/*
-		 * In some cases the 'File Protected' or 'Incorrect Length'
-		 * error might be expected and error recovery would be
-		 * unnecessary in these cases.	Check if the according suppress
-		 * bit is set.
+		 * In some cases certain errors might be expected and
+		 * error recovery would be unnecessary in these cases.
+		 * Check if the according suppress bit is set.
 		 */
 		sense = dasd_get_sense(&cqr->irb);
-		if (sense && sense[1] & SNS1_FILE_PROTECTED &&
-		    test_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags))
+		if (sense && (sense[1] & SNS1_INV_TRACK_FORMAT) &&
+		    !(sense[2] & SNS2_ENV_DATA_PRESENT) &&
+		    test_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags))
+			continue;
+		if (sense && (sense[1] & SNS1_NO_REC_FOUND) &&
+		    test_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags))
 			continue;
 		if (scsw_cstat(&cqr->irb.scsw) == 0x40 &&
 		    test_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags))
diff --git a/drivers/s390/block/dasd_3990_erp.c b/drivers/s390/block/dasd_3990_erp.c
index bbbacfc386f2..d0aa267462c5 100644
--- a/drivers/s390/block/dasd_3990_erp.c
+++ b/drivers/s390/block/dasd_3990_erp.c
@@ -1386,14 +1386,8 @@ dasd_3990_erp_file_prot(struct dasd_ccw_req * erp)
 
 	struct dasd_device *device = erp->startdev;
 
-	/*
-	 * In some cases the 'File Protected' error might be expected and
-	 * log messages shouldn't be written then.
-	 * Check if the according suppress bit is set.
-	 */
-	if (!test_bit(DASD_CQR_SUPPRESS_FP, &erp->flags))
-		dev_err(&device->cdev->dev,
-			"Accessing the DASD failed because of a hardware error\n");
+	dev_err(&device->cdev->dev,
+		"Accessing the DASD failed because of a hardware error\n");
 
 	return dasd_3990_erp_cleanup(erp, DASD_CQR_FAILED);
 
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 9388b5c383ca..90b106408992 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -2275,6 +2275,7 @@ dasd_eckd_analysis_ccw(struct dasd_device *device)
 	cqr->status = DASD_CQR_FILLED;
 	/* Set flags to suppress output for expected errors */
 	set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
+	set_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags);
 
 	return cqr;
 }
@@ -2556,7 +2557,6 @@ dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
 	cqr->buildclk = get_tod_clock();
 	cqr->status = DASD_CQR_FILLED;
 	/* Set flags to suppress output for expected errors */
-	set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
 	set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
 
 	return cqr;
@@ -4130,8 +4130,6 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
 
 	/* Set flags to suppress output for expected errors */
 	if (dasd_eckd_is_ese(basedev)) {
-		set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
-		set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
 		set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
 	}
 
@@ -4633,9 +4631,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
 
 	/* Set flags to suppress output for expected errors */
 	if (dasd_eckd_is_ese(basedev)) {
-		set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
-		set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
 		set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
+		set_bit(DASD_CQR_SUPPRESS_IT, &cqr->flags);
 	}
 
 	return cqr;
@@ -5780,36 +5777,32 @@ static void dasd_eckd_dump_sense(struct dasd_device *device,
 {
 	u8 *sense = dasd_get_sense(irb);
 
-	if (scsw_is_tm(&irb->scsw)) {
-		/*
-		 * In some cases the 'File Protected' or 'Incorrect Length'
-		 * error might be expected and log messages shouldn't be written
-		 * then. Check if the according suppress bit is set.
-		 */
-		if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
-		    test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
-			return;
-		if (scsw_cstat(&irb->scsw) == 0x40 &&
-		    test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
-			return;
+	/*
+	 * In some cases certain errors might be expected and
+	 * log messages shouldn't be written then.
+	 * Check if the according suppress bit is set.
+	 */
+	if (sense && (sense[1] & SNS1_INV_TRACK_FORMAT) &&
+	    !(sense[2] & SNS2_ENV_DATA_PRESENT) &&
+	    test_bit(DASD_CQR_SUPPRESS_IT, &req->flags))
+		return;
 
-		dasd_eckd_dump_sense_tcw(device, req, irb);
-	} else {
-		/*
-		 * In some cases the 'Command Reject' or 'No Record Found'
-		 * error might be expected and log messages shouldn't be
-		 * written then. Check if the according suppress bit is set.
-		 */
-		if (sense && sense[0] & SNS0_CMD_REJECT &&
-		    test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
-			return;
+	if (sense && sense[0] & SNS0_CMD_REJECT &&
+	    test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
+		return;
 
-		if (sense && sense[1] & SNS1_NO_REC_FOUND &&
-		    test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
-			return;
+	if (sense && sense[1] & SNS1_NO_REC_FOUND &&
+	    test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
+		return;
 
+	if (scsw_cstat(&irb->scsw) == 0x40 &&
+	    test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
+		return;
+
+	if (scsw_is_tm(&irb->scsw))
+		dasd_eckd_dump_sense_tcw(device, req, irb);
+	else
 		dasd_eckd_dump_sense_ccw(device, req, irb);
-	}
 }
 
 static int dasd_eckd_reload_device(struct dasd_device *device)
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index e5f40536b425..81cfb5c89681 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -196,7 +196,7 @@ struct dasd_ccw_req {
  * The following flags are used to suppress output of certain errors.
  */
 #define DASD_CQR_SUPPRESS_NRF	4	/* Suppress 'No Record Found' error */
-#define DASD_CQR_SUPPRESS_FP	5	/* Suppress 'File Protected' error*/
+#define DASD_CQR_SUPPRESS_IT	5	/* Suppress 'Invalid Track' error*/
 #define DASD_CQR_SUPPRESS_IL	6	/* Suppress 'Incorrect Length' error */
 #define DASD_CQR_SUPPRESS_CR	7	/* Suppress 'Command Reject' error */
 
-- 
2.43.0