Re: [PATCH 25/27] block: remove QUEUE_FLAG_DISCARD

[Coly Li <colyli@xxxxxxx>]

On 4/6/22 2:05 PM, 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@xxxxxx>
For the bcache part,

Acked-by: Coly Li <colyli@xxxxxxx>


Thanks.

Coly Li


> ---
>   arch/um/drivers/ubd_kern.c    |  2 --
>   block/blk-mq-debugfs.c        |  1 -
>   drivers/block/drbd/drbd_nl.c  | 15 ---------------
>   drivers/block/loop.c          |  2 --
>   drivers/block/nbd.c           |  3 ---
>   drivers/block/null_blk/main.c |  1 -
>   drivers/block/rbd.c           |  1 -
>   drivers/block/rnbd/rnbd-clt.c |  2 --
>   drivers/block/virtio_blk.c    |  2 --
>   drivers/block/xen-blkfront.c  |  2 --
>   drivers/block/zram/zram_drv.c |  1 -
>   drivers/md/bcache/super.c     |  1 -
>   drivers/md/dm-table.c         |  5 +----
>   drivers/md/dm-thin.c          |  2 --
>   drivers/md/dm.c               |  1 -
>   drivers/md/md-linear.c        |  9 ---------
>   drivers/md/raid0.c            |  7 -------
>   drivers/md/raid1.c            | 14 --------------
>   drivers/md/raid10.c           | 14 --------------
>   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 --
>   include/linux/blkdev.h        |  2 --
>   26 files changed, 7 insertions(+), 103 deletions(-)
[snipped]
> diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
> index 296f200b2e208..2f49e31142f62 100644
> --- a/drivers/md/bcache/super.c
> +++ b/drivers/md/bcache/super.c
> @@ -973,7 +973,6 @@ static int bcache_device_init(struct bcache_device *d, 
> unsigned int block_size,
>   
>   	blk_queue_flag_set(QUEUE_FLAG_NONROT, d->disk->queue);
>         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, d->disk->queue);
> -       blk_queue_flag_set(QUEUE_FLAG_DISCARD, d->disk->queue);
>   
>   	blk_queue_write_cache(q, true, true);
>   

[snipped]