+static long btrfs_ioctl_fs_info(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_fs_info_args fi_args;
+ struct btrfs_device *device;
+ struct btrfs_device *next;
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ fi_args.num_devices = fs_devices->num_devices;
+ fi_args.max_id = 0;
+ memcpy(&fi_args.fsid, root->fs_info->fsid, sizeof(fi_args.fsid));
+
+ mutex_lock(&fs_devices->device_list_mutex);
+ list_for_each_entry_safe(device, next, &fs_devices->devices, dev_list) {
+ if (device->devid > fi_args.max_id)
+ fi_args.max_id = device->devid;
+ }
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ if (copy_to_user(arg, &fi_args, sizeof(fi_args)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg)
+{
+ struct btrfs_ioctl_dev_info_args *di_args;
+ struct btrfs_device *dev;
+ struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices;
+ int ret = 0;
+ char *s_uuid = NULL;
+ char empty_uuid[BTRFS_UUID_SIZE] = {0};
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ di_args = memdup_user(arg, sizeof(*di_args));
+ if (IS_ERR(di_args))
+ return PTR_ERR(di_args);
+
+ if (memcmp(empty_uuid, di_args->uuid, BTRFS_UUID_SIZE) != 0)
+ s_uuid = di_args->uuid;
+
+ mutex_lock(&fs_devices->device_list_mutex);
+ dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL);
+ mutex_unlock(&fs_devices->device_list_mutex);
+
+ if (!dev) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ di_args->devid = dev->devid;
+ di_args->bytes_used = dev->bytes_used;
+ di_args->total_bytes = dev->total_bytes;
+ memcpy(di_args->uuid, dev->uuid, sizeof(di_args->uuid));
+ strncpy(di_args->path, dev->name, sizeof(di_args->path));
+
+out:
+ if (ret == 0 && copy_to_user(arg, di_args, sizeof(*di_args)))
+ ret = -EFAULT;
+
+ kfree(di_args);
+ return ret;
+}
+