diff mbox series

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

Message ID 171069246296.2684506.17423583037447505680.stgit@frogsfrogsfrogs (mailing list archive)
State New
Headers show
Series [01/40] fsverity: remove hash page spin lock | expand

Commit Message

Darrick J. Wong March 17, 2024, 4:29 p.m. UTC 
From: Andrey Albershteyn <aalbersh@redhat.com>

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@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
[djwong: fix braces]
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---
 fs/xfs/xfs_file.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

Comments

Andrey Albershteyn March 18, 2024, 7:48 p.m. UTC | #1 
On 2024-03-17 09:29:39, Darrick J. Wong wrote:
> From: Andrey Albershteyn <aalbersh@redhat.com>
> 
> 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@redhat.com>
> Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> [djwong: fix braces]
> Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> ---
>  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

>  		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);
> 
>
Darrick J. Wong March 19, 2024, 9:17 p.m. UTC | #2 
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@redhat.com>
> > 
> > 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@redhat.com>
> > Reviewed-by: Darrick J. Wong <djwong@kernel.org>
> > [djwong: fix braces]
> > Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> > ---
> >  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
> 
>
diff mbox series

Patch

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))
 		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);