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+ struct btrfs_device *device; > + struct btrfs_dev_lookup_args lookup_args = { .devt = bdev->bd_dev }; > + bool can_rw; > + > + mutex_lock(&fs_info->fs_devices->device_list_mutex); > + device = btrfs_find_device(fs_info->fs_devices, &lookup_args); > + if (!device) { > + btrfs_warn(fs_info, "unable to find btrfs device for block device '%pg'", > + bdev); > + mutex_unlock(&fs_info->fs_devices->device_list_mutex); > + return; > + } > + set_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state); > + device->fs_devices->missing_devices++; Where do we ensure that the block device wasn't already marked as missing? If there's no such check, could missing_devices end up exceeding total_devices? Thanks, Anand