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

[David Sterba]

On Tue, Jun 06, 2023 at 09:39:35AM +0200, Christoph Hellwig 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 +--
>  drivers/block/xen-blkback/xenbus.c  |  2 +-
>  drivers/block/zram/zram_drv.c       |  8 +++---
>  drivers/md/bcache/super.c           | 15 ++++++------
>  drivers/md/dm.c                     |  6 ++---
>  drivers/md/md.c                     | 38 +++++++++++++++--------------
>  drivers/mtd/devices/block2mtd.c     |  4 +--
>  drivers/nvme/target/io-cmd-bdev.c   |  2 +-
>  drivers/s390/block/dasd_genhd.c     |  2 +-
>  drivers/target/target_core_iblock.c |  6 ++---
>  drivers/target/target_core_pscsi.c  |  8 +++---

For

>  fs/btrfs/dev-replace.c              |  6 ++---
>  fs/btrfs/ioctl.c                    | 12 ++++-----
>  fs/btrfs/volumes.c                  | 28 ++++++++++-----------
>  fs/btrfs/volumes.h                  |  6 ++---

Acked-by: David Sterba <dsterba at suse.com>