Re: [PATCH 24/27] block: remove QUEUE_FLAG_DISCARD

[David Sterba <dsterba@suse.cz>]

On Sat, Apr 09, 2022 at 06:50:40AM +0200, Christoph Hellwig wrote:
> Just use a non-zero max_discard_sectors as an indicator for discard
> support, similar to what is done for write zeroes.
> 
> The only places where needs special attention is the RAID5 driver,
> which must clear discard support for security reasons by default,
> even if the default stacking rules would allow for it.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
> Acked-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> [btrfs]
> Acked-by: Coly Li <colyli@suse.de> [bcache]
> ---
>  arch/um/drivers/ubd_kern.c          |  2 --
>  block/blk-core.c                    |  2 +-
>  block/blk-lib.c                     |  2 +-
>  block/blk-mq-debugfs.c              |  1 -
>  block/ioctl.c                       |  3 +--
>  drivers/block/drbd/drbd_main.c      |  2 +-
>  drivers/block/drbd/drbd_nl.c        | 19 ++-----------------
>  drivers/block/drbd/drbd_receiver.c  |  3 +--
>  drivers/block/loop.c                | 11 +++--------
>  drivers/block/nbd.c                 |  5 +----
>  drivers/block/null_blk/main.c       |  1 -
>  drivers/block/rbd.c                 |  1 -
>  drivers/block/rnbd/rnbd-clt.c       |  2 --
>  drivers/block/rnbd/rnbd-srv-dev.h   |  3 ---
>  drivers/block/virtio_blk.c          |  2 --
>  drivers/block/xen-blkback/xenbus.c  |  2 +-
>  drivers/block/xen-blkfront.c        |  2 --
>  drivers/block/zram/zram_drv.c       |  1 -
>  drivers/md/bcache/request.c         |  4 ++--
>  drivers/md/bcache/super.c           |  3 +--
>  drivers/md/bcache/sysfs.c           |  2 +-
>  drivers/md/dm-cache-target.c        |  9 +--------
>  drivers/md/dm-clone-target.c        |  9 +--------
>  drivers/md/dm-log-writes.c          |  3 +--
>  drivers/md/dm-raid.c                |  9 ++-------
>  drivers/md/dm-table.c               |  9 ++-------
>  drivers/md/dm-thin.c                | 11 +----------
>  drivers/md/dm.c                     |  3 +--
>  drivers/md/md-linear.c              | 11 +----------
>  drivers/md/raid0.c                  |  7 -------
>  drivers/md/raid1.c                  | 16 +---------------
>  drivers/md/raid10.c                 | 18 ++----------------
>  drivers/md/raid5-cache.c            |  2 +-
>  drivers/md/raid5.c                  | 12 ++++--------
>  drivers/mmc/core/queue.c            |  1 -
>  drivers/mtd/mtd_blkdevs.c           |  1 -
>  drivers/nvme/host/core.c            |  6 ++----
>  drivers/s390/block/dasd_fba.c       |  1 -
>  drivers/scsi/sd.c                   |  2 --
>  drivers/target/target_core_device.c |  2 +-

For

>  fs/btrfs/extent-tree.c              |  4 ++--
>  fs/btrfs/ioctl.c                    |  2 +-

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