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authorStefan Weinhuber <wein@de.ibm.com>2010-03-08 14:26:24 +0300
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-03-08 14:26:27 +0300
commit33b62a30f78536b976183cc764c08038ac011e0a (patch)
tree60a18b4478c68082835fa6fee9a24bb1e7e8b312 /drivers/s390/block/dasd_eckd.c
parent584dfddfce1bd81d877f14de2b56d4bc747af821 (diff)
downloadlinux-33b62a30f78536b976183cc764c08038ac011e0a.tar.xz
[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_eckd.c')
-rw-r--r--drivers/s390/block/dasd_eckd.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index d7163f904f40..01f4e7a34aa8 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -1089,6 +1089,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
struct dasd_eckd_private *private;
struct dasd_block *block;
int is_known, rc;
+ int readonly;
if (!ccw_device_is_pathgroup(device->cdev)) {
dev_warn(&device->cdev->dev,
@@ -1182,15 +1183,20 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
else
private->real_cyl = private->rdc_data.no_cyl;
+ readonly = dasd_device_is_ro(device);
+ if (readonly)
+ set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
+
dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
- "with %d cylinders, %d heads, %d sectors\n",
+ "with %d cylinders, %d heads, %d sectors%s\n",
private->rdc_data.dev_type,
private->rdc_data.dev_model,
private->rdc_data.cu_type,
private->rdc_data.cu_model.model,
private->real_cyl,
private->rdc_data.trk_per_cyl,
- private->rdc_data.sec_per_trk);
+ private->rdc_data.sec_per_trk,
+ readonly ? ", read-only device" : "");
return 0;
out_err3: