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| author |   Jan Höppner <hoeppner@linux.vnet.ibm.com> | 2017-05-23 16:17:30 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-06-12 16:26:00 +0200 |
| commit | b487a914f853545842a0899329b6b72fe56c4081 (patch) | |
| tree | d66b22092f9f816f5c752edc525e1fbf149a1101 /drivers/s390 | |
| parent | s390: provide default ioremap and iounmap declaration (diff) | |
| download | wireguard-linux-b487a914f853545842a0899329b6b72fe56c4081.tar.xz wireguard-linux-b487a914f853545842a0899329b6b72fe56c4081.zip | |
s390/dasd: Display read-only attribute correctly
We have two flags, DASD_FLAG_DEVICE_RO and DASD_FEATURE_READONLY, that
tell us whether a device is read-only. DASD_FLAG_DEVICE_RO is set when a
device is attached as read-only to z/VM and DASD_FEATURE_READONLY is set
when either the corresponding kernel parameter is configured, or the
read-only state is changed via sysfs.
This is valuable information in any case. However, only the feature flag
is being checked at the moment when we display the current state.
Fix this by checking both flags.
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/block/dasd_devmap.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/s390/block/dasd_devmap.c b/drivers/s390/block/dasd_devmap.c index 05e5762d045e..0ce84f0a4d7f 100644 --- a/drivers/s390/block/dasd_devmap.c +++ b/drivers/s390/block/dasd_devmap.c @@ -748,13 +748,22 @@ static ssize_t dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { struct dasd_devmap *devmap; - int ro_flag; + struct dasd_device *device; + int ro_flag = 0; devmap = dasd_find_busid(dev_name(dev)); - if (!IS_ERR(devmap)) - ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; - else - ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; + if (IS_ERR(devmap)) + goto out; + + ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); + + spin_lock(&dasd_devmap_lock); + device = devmap->device; + if (device) + ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); + spin_unlock(&dasd_devmap_lock); + +out: return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); } |