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
> 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
