Re: [PATCH v5 20/24] xfs: disable direct read path for fs-verity files

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On Mon, Mar 04, 2024 at 08:10:43PM +0100, Andrey Albershteyn wrote:
> The direct path is not supported on verity files. Attempts to use direct
> I/O path on such files should fall back to buffered I/O path.
> 
> Signed-off-by: Andrey Albershteyn <aalbersh@xxxxxxxxxx>
> ---
>  fs/xfs/xfs_file.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
> index 17404c2e7e31..af3201075066 100644
> --- a/fs/xfs/xfs_file.c
> +++ b/fs/xfs/xfs_file.c
> @@ -281,7 +281,8 @@ xfs_file_dax_read(
>  	struct kiocb		*iocb,
>  	struct iov_iter		*to)
>  {
> -	struct xfs_inode	*ip = XFS_I(iocb->ki_filp->f_mapping->host);
> +	struct inode		*inode = iocb->ki_filp->f_mapping->host;
> +	struct xfs_inode	*ip = XFS_I(inode);
>  	ssize_t			ret = 0;
>  
>  	trace_xfs_file_dax_read(iocb, to);
> @@ -334,10 +335,18 @@ xfs_file_read_iter(
>  
>  	if (IS_DAX(inode))
>  		ret = xfs_file_dax_read(iocb, to);
> -	else if (iocb->ki_flags & IOCB_DIRECT)
> +	else if (iocb->ki_flags & IOCB_DIRECT && !fsverity_active(inode))
>  		ret = xfs_file_dio_read(iocb, to);
> -	else
> +	else {

I think the earlier cases need curly braces {} too.

> +		/*
> +		 * In case fs-verity is enabled, we also fallback to the
> +		 * buffered read from the direct read path. Therefore,
> +		 * IOCB_DIRECT is set and need to be cleared (see
> +		 * generic_file_read_iter())
> +		 */
> +		iocb->ki_flags &= ~IOCB_DIRECT;

I'm curious that you added this flag here; how have we gotten along
this far without clearing it?

--D

>  		ret = xfs_file_buffered_read(iocb, to);
> +	}
>  
>  	if (ret > 0)
>  		XFS_STATS_ADD(mp, xs_read_bytes, ret);
> -- 
> 2.42.0
> 
> 




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