[PATCH 16/31] block: use the holder as indication for exclusive opens

[Jinpu Wang]

On Tue, Jun 6, 2023 at 9:40 AM Christoph Hellwig <hch at lst.de> wrote:
>
> The current interface for exclusive opens is rather confusing as it
> requires both the FMODE_EXCL flag and a holder.  Remove the need to pass
> FMODE_EXCL and just key off the exclusive open off a non-NULL holder.
>
> For blkdev_put this requires adding the holder argument, which provides
> better debug checking that only the holder actually releases the hold,
> but at the same time allows removing the now superfluous mode argument.
>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>  block/bdev.c                        | 37 ++++++++++++++++------------
>  block/fops.c                        |  6 +++--
>  block/genhd.c                       |  5 ++--
>  block/ioctl.c                       |  5 ++--
>  drivers/block/drbd/drbd_nl.c        | 23 ++++++++++-------
>  drivers/block/pktcdvd.c             | 13 +++++-----
>  drivers/block/rnbd/rnbd-srv.c       |  4 +--
Acked-by: Jack Wang <jinpu.wang at ionos.com> # for rnbd