On Fri, Jun 28, 2019 at 07:29:41PM +0000, Martin Wilck wrote:
> From: Martin Wilck <mwilck@xxxxxxxx>
>
> Since 4d57b868, DASD partition tables are only recognized on
> DASD hardware. This turns out to break certain software that works
> e.g. with DASD partition tables on loop devices. The problem that
> 4d57b868 attempted to fix was that "unlabeled disk" format has
> no signature at all and is detected on any volume, including
> empty ones.
>
> With this patch, DASD partition table formats other than "unlabeled
> disk" are detected on non-DASD devices again.
>
> Fixes: 4d57b868 "kpartx: only recognize dasd part table on DASD"
Reviewed-by: Benjamin Marzinski <bmarzins@xxxxxxxxxx>
> ---
> kpartx/dasd.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/kpartx/dasd.c b/kpartx/dasd.c
> index 61b609a5..3fcef6ad 100644
> --- a/kpartx/dasd.c
> +++ b/kpartx/dasd.c
> @@ -133,9 +133,6 @@ read_dasd_pt(int fd, struct slice all, struct slice *sp, int ns)
> /* Couldn't open the device */
> return -1;
> }
> - } else if ((unsigned int)major(sbuf.st_rdev) != 94) {
> - /* Not a DASD */
> - return -1;
> } else {
> fd_dasd = dup(fd);
> }
> @@ -277,6 +274,10 @@ read_dasd_pt(int fd, struct slice all, struct slice *sp, int ns)
> size = disksize;
> if (fmt_size < size)
> size = fmt_size;
> + } else if ((unsigned int)major(sbuf.st_rdev) != 94) {
> + /* Not a DASD */
> + retval = -1;
> + goto out;
> } else
> size = disksize;
>
> --
> 2.21.0
>
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