Re: [PATCH 24/40] xfs: disable direct read path for fs-verity files

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On Mon, Mar 18, 2024 at 08:48:47PM +0100, Andrey Albershteyn wrote:
> On 2024-03-17 09:29:39, Darrick J. Wong wrote:
> > From: Andrey Albershteyn <aalbersh@xxxxxxxxxx>
> > 
> > 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>
> > Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
> > [djwong: fix braces]
> > Signed-off-by: Darrick J. Wong <djwong@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 74dba917be93..0ce51a020115 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))
> 
> Brackets missing

Oops, will fix that.  Thanks!

--D

> >  		ret = xfs_file_dio_read(iocb, to);
> > -	else
> > +	else {
> > +		/*
> > +		 * 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;
> >  		ret = xfs_file_buffered_read(iocb, to);
> > +	}
> >  
> >  	if (ret > 0)
> >  		XFS_STATS_ADD(mp, xs_read_bytes, ret);
> > 
> > 
> 
> -- 
> - Andrey
> 
> 




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