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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_devmap.c | |
| parent | 584dfddfce1bd81d877f14de2b56d4bc747af821 (diff) | |
| download | kernel_samsung_smdk4412-33b62a30f78536b976183cc764c08038ac011e0a.zip kernel_samsung_smdk4412-33b62a30f78536b976183cc764c08038ac011e0a.tar.gz kernel_samsung_smdk4412-33b62a30f78536b976183cc764c08038ac011e0a.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_devmap.c')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index d49766f..8e23919 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -742,6 +742,7 @@ dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct dasd_devmap *devmap; + struct dasd_device *device; int val; char *endp; @@ -758,12 +759,14 @@ dasd_ro_store(struct device *dev, struct device_attribute *attr, devmap->features |= DASD_FEATURE_READONLY; else devmap->features &= ~DASD_FEATURE_READONLY; - if (devmap->device) - devmap->device->features = devmap->features; - if (devmap->device && devmap->device->block - && devmap->device->block->gdp) - set_disk_ro(devmap->device->block->gdp, val); + device = devmap->device; + if (device) { + device->features = devmap->features; + val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); + } spin_unlock(&dasd_devmap_lock); + if (device && device->block && device->block->gdp) + set_disk_ro(device->block->gdp, val); return count; } |