Re: [PATCH 1/6] block: remove checks for FALLOC_FL_NO_HIDE_STALE

["Darrick J. Wong" <djwong@kernel.org>]

On Tue, Aug 27, 2024 at 08:50:45AM +0200, Christoph Hellwig wrote:
> While the FALLOC_FL_NO_HIDE_STALE value has been registered, it has
> always been rejected by vfs_fallocate before making it into
> blkdev_fallocate because it isn't in the supported mask.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

Yeah, I guess that never worked.  Oh well.  BLKDISCARD it is.
Reviewed-by: Darrick J. Wong <djwong@kernel.org>

--D

> ---
>  block/fops.c | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/block/fops.c b/block/fops.c
> index 9825c1713a49a9..7f48f03a62e9a8 100644
> --- a/block/fops.c
> +++ b/block/fops.c
> @@ -771,7 +771,7 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to)
>  
>  #define	BLKDEV_FALLOC_FL_SUPPORTED					\
>  		(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE |		\
> -		 FALLOC_FL_ZERO_RANGE | FALLOC_FL_NO_HIDE_STALE)
> +		 FALLOC_FL_ZERO_RANGE)
>  
>  static long blkdev_fallocate(struct file *file, int mode, loff_t start,
>  			     loff_t len)
> @@ -830,14 +830,6 @@ static long blkdev_fallocate(struct file *file, int mode, loff_t start,
>  					     len >> SECTOR_SHIFT, GFP_KERNEL,
>  					     BLKDEV_ZERO_NOFALLBACK);
>  		break;
> -	case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE | FALLOC_FL_NO_HIDE_STALE:
> -		error = truncate_bdev_range(bdev, file_to_blk_mode(file), start, end);
> -		if (error)
> -			goto fail;
> -
> -		error = blkdev_issue_discard(bdev, start >> SECTOR_SHIFT,
> -					     len >> SECTOR_SHIFT, GFP_KERNEL);
> -		break;
>  	default:
>  		error = -EOPNOTSUPP;
>  	}
> -- 
> 2.43.0
> 
>