Commit 34cd551a authored Aug 03, 2011 by Stefan Haberland Committed by Heiko Carstens Aug 03, 2011

[S390] dasd: check if raw track access is supported



To use raw track access some special storage server commands are
needed. Older storage hardware may not support these commands.
So check if raw track access is possible while setting the DASD
online.

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

parent 9dc7356e

drivers/s390/block/dasd_eckd.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -1461,6 +1461,15 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
		"Read device characteristic failed, rc=%d", rc);
		goto out_err3;
		}

		if ((device->features & DASD_FEATURE_USERAW) &&
		!(private->rdc_data.facilities.RT_in_LR)) {
		dev_err(&device->cdev->dev, "The storage server does not "
		"support raw-track access\n");
		rc = -EINVAL;
		goto out_err3;
		}

		/* find the valid cylinder size */
		if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
		private->rdc_data.long_no_cyl)