On Fri 10-01-20 11:29:35, ira.weiny@xxxxxxxxx wrote:
> From: Ira Weiny <ira.weiny@xxxxxxxxx>
>
> The IS_DAX() check in io_is_direct() causes a race between changing the
> DAX mode and creating the iocb flags.
>
> Remove the check because DAX now emulates the page cache API and
> therefore it does not matter if the file mode is DAX or not when the
> iocb flags are created.
>
> Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
The patch looks good to me. You can add:
Reviewed-by: Jan Kara <jack@xxxxxxx>
Honza
> ---
> include/linux/fs.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index d7584bcef5d3..e11989502eac 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -3365,7 +3365,7 @@ extern int file_update_time(struct file *file);
>
> static inline bool io_is_direct(struct file *filp)
> {
> - return (filp->f_flags & O_DIRECT) || IS_DAX(filp->f_mapping->host);
> + return (filp->f_flags & O_DIRECT);
> }
>
> static inline bool vma_is_dax(struct vm_area_struct *vma)
> --
> 2.21.0
>
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
