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

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2024-03-07 14:11:08, Darrick J. Wong wrote:
> 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

Do you know any better place? Not sure if that should be somewhere
before. I've made it same as ext4 does it.

-- 
- Andrey





[Index of Archives]     [XFS Filesystem Development (older mail)]     [Linux Filesystem Development]     [Linux Audio Users]     [Yosemite Trails]     [Linux Kernel]     [Linux RAID]     [Linux SCSI]


  Powered by Linux