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authorStefan Weinhuber <wein@de.ibm.com>2010-03-08 12:26:24 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-03-08 12:26:27 +0100
commit33b62a30f78536b976183cc764c08038ac011e0a (patch)
tree60a18b4478c68082835fa6fee9a24bb1e7e8b312 /drivers/s390/block/dasd_fba.c
parent584dfddfce1bd81d877f14de2b56d4bc747af821 (diff)
downloadlinux-33b62a30f78536b976183cc764c08038ac011e0a.tar.bz2
[S390] dasd: automatic recognition of read-only devices
In z/VM it is possible to attach a device as read-only. To prevent unintentional write requests and subsequent I/O errors, we can detect this configuration using the z/VM DIAG 210 interface and set the respective linux block device to read-only as well. 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_fba.c')
-rw-r--r--drivers/s390/block/dasd_fba.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 0f152444ac77..37282b90eecc 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -124,6 +124,7 @@ dasd_fba_check_characteristics(struct dasd_device *device)
struct dasd_fba_private *private;
struct ccw_device *cdev = device->cdev;
int rc;
+ int readonly;
private = (struct dasd_fba_private *) device->private;
if (!private) {
@@ -162,16 +163,21 @@ dasd_fba_check_characteristics(struct dasd_device *device)
return rc;
}
+ readonly = dasd_device_is_ro(device);
+ if (readonly)
+ set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
+
dev_info(&device->cdev->dev,
"New FBA DASD %04X/%02X (CU %04X/%02X) with %d MB "
- "and %d B/blk\n",
+ "and %d B/blk%s\n",
cdev->id.dev_type,
cdev->id.dev_model,
cdev->id.cu_type,
cdev->id.cu_model,
((private->rdc_data.blk_bdsa *
(private->rdc_data.blk_size >> 9)) >> 11),
- private->rdc_data.blk_size);
+ private->rdc_data.blk_size,
+ readonly ? ", read-only device" : "");
return 0;
}