[dm-devel] [PATCH 4/5] kpartx: default to running in sync mode

[Xose Vazquez Perez]

On 04/25/2017 12:39 AM, Benjamin Marzinski wrote:

> When users run kpartx, they would naturally assume that when it
> completes, the devices have been created. However, kpartx runs in async
> mode by default.  This seems like it is likely to trip up users.  So,
> switch the default to sync mode, add a -n option to enable async mode,
> and set async mode when kpartx is called by the udev rules.
>[...]
> diff --git a/kpartx/kpartx.c b/kpartx/kpartx.c
> index 58e60ff..d1edd5e 100644
> --- a/kpartx/kpartx.c
> +++ b/kpartx/kpartx.c
>[...]
> -static char short_opts[] = "rladfgvp:t:su";
> +static char short_opts[] = "rladfgvp:t:snu";
>[...]
> -	printf("\t-s sync mode. Don't return until the partitions are created\n");
> +	printf("\t-n nosync mode. Return before the partitions are created\n");
> +	printf("\t-s sync mode. Don't return until the partitions are created. Default.\n");
>  	return 1;
>[...]> +		case 'n':
> +			udev_sync = 0;
> +			break;

New flags should be documented in its man page.