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path: root/drivers/s390/block/dasd_ioctl.c
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Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
-rw-r--r--drivers/s390/block/dasd_ioctl.c56
1 files changed, 56 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 8e26001dc11c..9a5f3add325f 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -333,6 +333,59 @@ out_err:
return rc;
}
+static int dasd_release_space(struct dasd_device *device,
+ struct format_data_t *rdata)
+{
+ if (!device->discipline->is_ese && !device->discipline->is_ese(device))
+ return -ENOTSUPP;
+ if (!device->discipline->release_space)
+ return -ENOTSUPP;
+
+ return device->discipline->release_space(device, rdata);
+}
+
+/*
+ * Release allocated space
+ */
+static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
+{
+ struct format_data_t rdata;
+ struct dasd_device *base;
+ int rc = 0;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EACCES;
+ if (!argp)
+ return -EINVAL;
+
+ base = dasd_device_from_gendisk(bdev->bd_disk);
+ if (!base)
+ return -ENODEV;
+ if (base->features & DASD_FEATURE_READONLY ||
+ test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
+ rc = -EROFS;
+ goto out_err;
+ }
+ if (bdev != bdev->bd_contains) {
+ pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
+ dev_name(&base->cdev->dev));
+ rc = -EINVAL;
+ goto out_err;
+ }
+
+ if (copy_from_user(&rdata, argp, sizeof(rdata))) {
+ rc = -EFAULT;
+ goto out_err;
+ }
+
+ rc = dasd_release_space(base, &rdata);
+
+out_err:
+ dasd_put_device(base);
+
+ return rc;
+}
+
#ifdef CONFIG_DASD_PROFILE
/*
* Reset device profile information
@@ -595,6 +648,9 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
case BIODASDREADALLCMB:
rc = dasd_ioctl_readall_cmb(block, cmd, argp);
break;
+ case BIODASDRAS:
+ rc = dasd_ioctl_release_space(bdev, argp);
+ break;
default:
/* if the discipline has an ioctl method try it. */
rc = -ENOTTY;