diff options
Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
| -rw-r--r-- | drivers/s390/block/dasd_ioctl.c | 56 |
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; |