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| author | Stefan Weinhuber <wein@de.ibm.com> | 2010-03-08 12:26:24 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-03-08 12:26:27 +0100 |
| commit | 33b62a30f78536b976183cc764c08038ac011e0a (patch) | |
| tree | 60a18b4478c68082835fa6fee9a24bb1e7e8b312 /drivers/s390/block/dasd_fba.c | |
| parent | 584dfddfce1bd81d877f14de2b56d4bc747af821 (diff) | |
| download | linux-stable-33b62a30f78536b976183cc764c08038ac011e0a.tar.gz linux-stable-33b62a30f78536b976183cc764c08038ac011e0a.tar.bz2 linux-stable-33b62a30f78536b976183cc764c08038ac011e0a.zip | |
[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.c | 10 |
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; } |