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authorStefan Weinhuber <wein@de.ibm.com>2009-12-07 12:51:48 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2009-12-07 12:51:34 +0100
commit22825ab7693fd29769518a0d25ba43c01a50092a (patch)
treeb4cc2d22baafb8851efac2fed87fda4982dd8209 /drivers/s390/block/dasd_diag.c
parent6c1e3e79430615d0472dbf9f8fed89c571e66423 (diff)
[S390] dasd: support DIAG access for read-only devices
When a DASD device is used with the DIAG discipline, the DIAG initialization will indicate success or error with a respective return code. So far we have interpreted a return code of 4 as error, but it actually means that the initialization was successful, but the device is read-only. To allow read-only devices to be used with DIAG we need to accept a return code of 4 as success. Re-initialization of the DIAG access is also part of the DIAG error recovery. If we find that the access mode of a device has been changed from writable to read-only while the device was in use, we print an error message. Signed-off-by: Stefan Weinhuber <wein@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_diag.c')
-rw-r--r--drivers/s390/block/dasd_diag.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 4e49b4a6c88..8174ec92176 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -145,6 +145,15 @@ dasd_diag_erp(struct dasd_device *device)
mdsk_term_io(device);
rc = mdsk_init_io(device, device->block->bp_block, 0, NULL);
+ if (rc == 4) {
+ if (!(device->features & DASD_FEATURE_READONLY)) {
+ dev_warn(&device->cdev->dev,
+ "The access mode of a DIAG device changed"
+ " to read-only");
+ device->features |= DASD_FEATURE_READONLY;
+ }
+ rc = 0;
+ }
if (rc)
dev_warn(&device->cdev->dev, "DIAG ERP failed with "
"rc=%d\n", rc);
@@ -433,16 +442,20 @@ dasd_diag_check_device(struct dasd_device *device)
for (sb = 512; sb < bsize; sb = sb << 1)
block->s2b_shift++;
rc = mdsk_init_io(device, block->bp_block, 0, NULL);
- if (rc) {
+ if (rc && (rc != 4)) {
dev_warn(&device->cdev->dev, "DIAG initialization "
"failed with rc=%d\n", rc);
rc = -EIO;
} else {
+ if (rc == 4)
+ device->features |= DASD_FEATURE_READONLY;
dev_info(&device->cdev->dev,
- "New DASD with %ld byte/block, total size %ld KB\n",
+ "New DASD with %ld byte/block, total size %ld KB%s\n",
(unsigned long) block->bp_block,
(unsigned long) (block->blocks <<
- block->s2b_shift) >> 1);
+ block->s2b_shift) >> 1,
+ (rc == 4) ? ", read-only device" : "");
+ rc = 0;
}
out_label:
free_page((long) label);